WorldWideScience

Sample records for marinas cuaternarias emergidas

  1. cuaternarias de amonio.

    Directory of Open Access Journals (Sweden)

    Juan Mario Junco del Pino

    2013-01-01

    Full Text Available Como parte de las investigaciones que se realizan en Cuba con el empleo de sales cuaternarias de amonio, como aditivo para la estabilización de los suelos de subrasante de carreteras, denominado Sistema Rocamix, se muestran los resultados obtenidos con el producto en varios trabajos ejecutados, con diferentes suelos, clasificados todos dentro de los grupos A-6 o A-7 (según AASTHO; y en los cuales este tipo de estabilización ha sido apreciablemente efectiva. Se aprecia en los análisis realizados, que son evidentes los incrementos de la resistencia en los suelos arcillosos, sin embargo, estos aumentos no se logran siempre en la misma proporción, a pesar de que la carta de Plasticidad de Casagrande los clasifica dentro del mismo grupo. Se ha encontrado buena correlación entre el incremento de la resistencia a CBR y el Índice de Actividad de la Arcilla, lo que explica las diferencias encontradas en el aumento de resistencia.

  2. IATROGENIAY PREVENCIÓN CUATERNARIA EN SALUD MENTAL

    Directory of Open Access Journals (Sweden)

    Alberto Ortiz Lobo

    2011-01-01

    Full Text Available La prevención cuaternaria evita o atenúa las consecuencias de la actividad innecesaria o excesiva del sistema sanitario. La iatrogenia producida por la actividad sanitaria es un grave problema de salud pública que en salud mental está poco estudiado. El perjuicio que se puede infligir a los pacientes abarca todo el episodio de atención, desde la prevención hasta el tratamiento pasando por el proceso diagnóstico. Se revisan los perjuicios que causan las actividades preventivas como el abordaje del duelo o el debriefing, los tratamientos farmacológicos y psicoterapéuticos, la iatrogenia del diagnostico y del sistema de atención relacionado especialmente con el estigma. Tomar conciencia de la gravedad de la iatrogenia que nuestras intervenciones "bien hechas" pueden producir permite poner en primer plano la relevancia de la prevención cuaternaria y la necesidad de trabajar con el modelo de decisiones compartidas considerando siempre alternativas y extremando las medidas que garanticen la seguridad y derechos de los pacientes.

  3. Estabilización de Suelos mediante el empleo de Sales Cuaternarias

    Directory of Open Access Journals (Sweden)

    Juan M. Junco del Pino

    2010-01-01

    Full Text Available El Mundo se dirige hacia el aprovechamiento de los Suelos mediante el desarrollo de nuevas técnicas y adaptarse a las condiciones del entorno resulta importante para la Ingeniería. El mejoramiento de los suelos abre nuevas posibilidades de ahorro que pueden llegar de 20 a 45 % respecto a los costos de construcción convencional. La Estabilización Química de Suelos consiste en el empleo de sustancias químicas con el objetivo de modificar las propiedades del suelo para hacerlo más denso o incrementar la vinculación de las partículas del mismo para aumentar su capacidad de soporte sin deformación. Las formas más empleadas en la Estabilización Química de Suelos son con cemento, sales y cal. A partir de estas necesidades se desarrolló una Investigación en Cuba que culminó con la creación de un Sistema de Estabilización e Impermeabilización de Suelos a partir del empleo de Sales Cuaternarias, el cual tiene como efectos : Economía, Resistencia, Simplicidad y beneficios ecológicos. Las Aplicaciones fundamentales de esta Técnica de Estabilización e Impermeabilización son en Subrasantes estabilizadas para pavimentos, Mantenimiento y Construcción de Vías, Terraplenes para ferrocarril y Basureros, entre otros. Nuestro trabajo abarca parte de los Resultados logrados mediante la aplicación de este Sistema de Estabilización e Impermeabilización, mostrando como su efecto sobre las Propiedades Mecánicas y de Impermeabilidad en los Suelos aumentan con el tiempo.

  4. Las formaciones Plio-Cuaternarias de El Abalario, en el litoral de la provincia de Huelva

    Directory of Open Access Journals (Sweden)

    Salvany, J. M.

    2010-12-01

    Full Text Available The study of new and ancient boreholes in El Abalario area (Lower Guadalquivir basin permitted to identify four main plio-quaternary formations above the Miocene marls, namely: Huelva Sands, Bonares Sands, Almonte Sands and Gravels, and El Abalario Sands. Respectively, they are interpreted as shallow marine, deltaic, alluvial and eolian sediments, together forming a marine to continental sequence that reaches a thickness of more than 250 metres. All sediments are arranged as a gentle dipping and thickening structure to the southeast. Only a few boreholes of the western border of El Abalario reach the top of the Miocene marls. In the rest of the Abalario area the Miocene marls are confined to an unknown level bellow the deepest boreholes. Upward, the marls grade to the Huelva sands, without any appreciable break in the sediments. To the north, the upper part of the Huelva formation grades to the Bonares sands, which is mainly developed outside the study area. Both formations are covered by the coarse clastic deposits of the Almonte formation. At the top, El Abalario sands recover all previous deposits and configure the current relief. The study performs the early existing geology profile and the connection with the surrounding areas.

    El estudio de nuevos y antiguos sondeos en El Abalario (Bajo Guadalquivir permite identificar por encima de las margas miocenas, cuatro principales formaciones plio-cuaternarias, denominadas: Fm. Arenas de Huelva, Fm. Arenas de Bonares, Fm. Arenas y Gravas de Almonte, y Fm. Arenas de El Abalario, respectivamente interpretadas como sedimentos marinos someros, deltaicos, aluviales y eólicos. En conjunto forman una potente sucesión de más 250 metros de espesor, de estructura ligeramente inclinada y de espesor creciente hacia el sureste. Sólo algunos sondeos de la parte occidental de El Abalario alcanzan las margas miocenas. En el resto del área de El Abalario, las margas están a una profundidad desconocida

  5. Nuevas evidencias de deformaciones cuaternarias asociadas a la falla Sierra chica, Sierras pampeanas de Córdoba

    Directory of Open Access Journals (Sweden)

    Guillermo L Sagripanti

    2012-12-01

    Full Text Available En la intraplaca argentina, entre los 31º 45' y 32º 45' de latitud S, en el frente occidental de la Sierra Chica, Sierras Pampeanas de Córdoba, la presencia de morfologías superficiales y deformaciones en sedimentos cuaternarios permiten deducir que la actividad tectónica neógena en la región, tuvo continuidad en el Holoceno y probablemente ha tenido asociada la ocurrencia de paleoterremotos. Los objetivos de la presente contribución son presentar nuevas evidencias de deformaciones cuaternarias asociadas a la falla Sierra Chica, extender su traza hacia el sur en la llanura y hacer una estimación preliminar del potencial sismogénico asociado a esta estructura. Se relevaron siete perfiles transversales a la traza de una falla secundaria del frente principal de levantamiento de la Sierra Chica. Estos presentan el basamento cristalino precámbrico, depósitos conglomerádicos y sedimentos no cohesivos cuaternarios, afectados por deformaciones dúctiles y frágiles correspondientes a reactivaciones pleistocenas y holocenas de la estructura. Los resultados obtenidos han permitido extender la traza de la falla hacia el S en la llanura hasta el arroyo Tegua, relevar estructuras deformacionales en sedimentos finos no reportadas hasta el presente y estimar la magnitud máxima de un terremoto futuro, entre Ms 6,7-7,5 y Mw=7,5, asociado a la falla Sierra Chica.

  6. Tectónica cuaternaria en el retroarco Andino a la latitud del volcán Tromen (37°s

    Directory of Open Access Journals (Sweden)

    Guido Gianni

    2014-12-01

    Full Text Available Estudios recientes focalizados en las vecindades del volcán Tromen, en el norte de la provincia de Neuquén, indican la presencia de estructuras afectando rocas de edad cuaternaria. En particular, un análisis detallado del flanco occidental del volcán Tromen muestra amplias zonas de deformación neotectónica, de las cuales sólo habían sido reconocidos sus sectores frontales. Se detallan geometría y mecanismos asociados a las principales estructuras cuaternarias a través de los dos valles principales que afectan este flanco volcánico. La coexistencia de estructuras neotectónicas contraccionales y distensivas es descripta como un rasgo distintivo. Así, el campo de esfuerzos asociado a este conjunto de estructuras es discutido: Mientras algunos estudios previos puntualizan que la deformación sería de carácter contraccional, otros apuntan a un régimen predominantemente distensivo. Finalmente, se plantea una alternativa que reconcilia ambos modelos en base a los nuevos datos.

  7. Fallas con actividad cuaternaria en el corredor tectonico Matagusanos-Maradona-Acequion entre los rios de La Flecha y del Agua, provincia de San Juan

    Directory of Open Access Journals (Sweden)

    Laura P Perucca

    2011-03-01

    Full Text Available En la depresión situada entre los ríos de La Flecha y del Agua, se encuentran evidencias de fallamiento cuaternario, entre dos sistemas estructurales con rumbo norte y vergencias opuestas, Precordillera Central con vergencia oriental y estilo de piel fina y Precordillera Oriental, con vergencia occidental y piel gruesa. Se reconocieron numerosas fallas con actividad cuaternaria a lo largo de toda la depresión: aquellas ubicadas en su porción oriental, en las proximidades del cerro La Chilca, con el mismo estilo estructural de Precordillera Oriental: fallas inversas inclinando al este con alto ángulo en la superficie. Por el contrario, las fallas localizadas en el piedemonte oriental del cordón de Las Osamentas tienen un estilo estructural consistente con Precordillera Central, inversas y con vergencia oriental. Este arreglo estructural de las fallas cuaternarias con vergencia opuesta se compara con aquellos descriptos en la depresión de Matagusanos, donde se identificó una zona triangular de tipo piel gruesa localizada cerca de su porción occidental y en el valle de zonda, situado al norte del sector analizado.

  8. La cuenca cuaternaria endorreica de Cachipampa,Calchaquenia, Salta The endorheic Quaternary Cachipampa basin,Calchaquenia, Salta

    Directory of Open Access Journals (Sweden)

    JoséAntonio Salfity

    2009-11-01

    Full Text Available La cuenca de Cachipampa, Salta, es una pequeñadepresión tectónica endorreica formada durante el Cuaternario, limitada por elnorte, este y oeste por serranías constituidas por terrenosprecámbrico-eocámbricos de la Formación Puncoviscana; cretácico-paleógenos delGrupo Salta, y por el sur, por unidades del Eoceno Medio-Plioceno-¿Pleistoceno?del Grupo Payogastilla. El marco regional donde está emplazada es la provinciageológica Calchaquenia, al sur de la Cordillera Oriental, sobre el bordeoriental del valle Calchaquí. La tectónica la rigen fallas inversas devergencia occidental, algunas de las cuales fueron fallas directas activasdurante el depósito del Grupo Salta y, posteriormente, fallas inversas durantela inversión de esa cuenca desde el Eoceno Medio al Plioceno-¿Pleistoceno?,tiempos en que se completó el potente relleno de la cuenca de antepaís delGrupo Payogastilla. Los movimientos compresivos del diastrofismo Diaguita, queinvirtieron la cuenca del Grupo Payogastilla, tuvieron como epílogo laformación de la cuenca fluvial y lacustre cuaternaria de Cachipampa, cuyoestilo tectónico se definiría como de cuenca del tipo a cuestas (o montada obien de cuenca intermontana con relleno postectónico.The Cachipampa basin, in theProvince of Salta, is a small, endorheic tectonic depression formed during theQuaternary and located eastwards of the valle Calchaquí. The northern, easternand western basin boundaries are tectonic blocks formed by PuncoviscanaFormation (Proterozoic-Eocambrian and Salta Group (Cretaceous-Paleogene; thesouthern limit is Middle Eocene-Pliocene-Plesitocene? sediments of thePayogastilla Group. The regional framework where the Cachipampa basin islocated is the geological province of Calchaquenia, southwards of CordilleraOriental. West-verging reverse faults govern the tectonics, some of which wereactive normal faults during the deposition of the Salta Group. These reversefaults led to the inversion of the Salta

  9. Louisiana Marinas and Boat Launches, Geographic NAD83, LOSCO (2004) [marinas_LOSCO_2004

    Data.gov (United States)

    Louisiana Geographic Information Center — The dataset defines the location and supplemental information for marinas and boat launches in southern Louisiana. The boat launch database includes public and...

  10. An Overview of the Main Quaternary Deformation of South America Una perspectiva sobre las principales deformaciones cuaternarias de América del Sur

    Directory of Open Access Journals (Sweden)

    C.H. Costa

    2006-12-01

    Full Text Available Deformation affecting continental South America during Quaternary is related to the Neogene geodynamic processes. These structures are mainly controlled by anisotropies inherited after a long and complex history as well as by the kinematic and geometric features of the ongoing plate interaction. Main Quaternary structures at both ends of South America are directly linked to plate interaction and some of them are considered to be plate boundaries. The main structures with Quaternary activity along the Caribbean coast have an E-W trend and a strike-slip regime. Between the Venezuelan Andes and the Gulf of Guayaquil, NE trending structures are dominant, with a kinematic regime ranging from strike-slip to transpressive and compressive. At the Central Andes (4ºS-46º30'S most Quaternary deformation results from a complex stress distribution and stress-partitioning at the interior of the South American plate, reactivating preexisting discontinuities. The present geometry of the subducted Nazca plate is here the main control with respect to the distribution and characteristics of Quaternary deformation, being them better exposed at the Andean eastern slope and foreland regions. The main structure with Quaternary activity at the southernmost Andes is represented at Tierra del Fuego by a left-lateral transform boundary, resulting from the South American and Scotia plate interaction.Las deformaciones que han afectado al sector continental de Sudamérica durante el Cuaternario aparecen vinculadas con los procesos geodinámicos dominantes durante el Neógeno. Las mismas están principalmente controladas por las anisotropías heredadas de una prolongada y compleja historia evolutiva y por las características cinemáticas y geométricas que caracterizan a la interacción actual de placas. Las principales características de la tectónica cuaternaria en los extremos norte y sur de Sudamérica, derivan en forma directa de las interacciones entre bordes de

  11. Patrimonio Natural y Reservas Marinas

    Directory of Open Access Journals (Sweden)

    Raquel de la Cruz Modino

    2004-01-01

    Full Text Available Las reservas marinas intentan preservar ciertas zonas de especial interés biológico de los excesos de la pesca con el fin de asegurar la protección, la regeneración y el desarrollo de los recursos marinos. Con ellas se aspira a regular las diferentes actividades que en estas áreas se llevan a cabo y conjugar los usos turísticos y recreativos que se pueden realizar con la conservación de sus valores naturales. Sin embargo, por norma general, la regulación sobre los usos que pueden desarrollarse en áreas naturales especialmente frágiles como éstas, se restringe a establecer una serie de limitaciones sobre las actividades que son llevadas a cabo en la zona. La implantación de figuras como éstas, dentro de un contexto turístico, puede alentar y promover el desarrollo de actividades recreativas frente a los usos tradicionales, que han podido quedar limitados en el área protegida

  12. 33 CFR 80.1118 - Marina Del Rey, CA.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Marina Del Rey, CA. 80.1118 Section 80.1118 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY INTERNATIONAL NAVIGATION RULES COLREGS DEMARCATION LINES Pacific Coast § 80.1118 Marina Del Rey, CA. (a) A line drawn from Marina Del Rey Breakwater South Light...

  13. Aditivo químico obtenido de sales cuaternarias empleado para la estabilización de suelos arcillosos de subrasantes de carreteras

    Directory of Open Access Journals (Sweden)

    Juan M. Junco del Pino

    2011-01-01

    Full Text Available La construcción de subrasantes para obras viales, como principio, se basa en el aprovechamiento de suelos locales como material de fácil obtención y de bajo costo, pero que en ocasiones necesitan ser mejorados, dado que no cumplen las exigencias mínimas para su empleo. Aún así se logran grandes ahorros, del orden del 20 al 45 % respecto a los costos de construcción con materiales extraídos de canteras de préstamos lejanas. La estabilización química es una de las técnicas que se emplean para el mejoramiento de subrasantes, utilizando sustancias químicas que modifican las características de los suelos, reduciendo plasticidad e incrementando la cohesión y su capacidad de soporte. En Cuba, para aliviar la carencia de materiales locales en algunas regiones del país, se desarrolló una investigación que dio como resultado la creación de un procedimiento de estabilización de suelos utilizando sales cuaternarias. El "Sistema de Estabilización e Impermeabilización de Suelos", así creado, tiene como ventajas principales su economía y simplicidad en su empleo, además de conseguir el incremento de resistencia y reducción de permeabilidad en los suelos donde se aplique. El presente trabajo contiene una exploración sobre el estado de la técnica de utilización de aditivos en el mejoramiento de suelos, en la esfera internacional, y sobre el modo en que las sales cuaternarias producen los cambios en los suelos arcillosos, también algunos de los resultados fundamentales del empleo de esta técnica en nuestro país. Se analiza el comportamiento de las propiedades físicas y mecánicas de los suelos estabilizados con el sistema, comparando las propiedades físicas y mecánicas del suelo en su estado natural y después de mejorados, así como la evolución de las características en el tiempo de los suelos estabilizados.

  14. Esteróles en esponjas marinas

    Directory of Open Access Journals (Sweden)

    Carmenza Duque

    2009-07-01

    Full Text Available Esta revisión bibliográfica comprende la mayona del trabajo publicado hasta el momento sobre esteróles aislados de esponjas marinas. Estos esteróles comprenden compuestos desde Cig hasta C31 con estructuras convencionales y con estructuras novedosas (núcleo y/o cadena lateral no convencional.

  15. Eelgrass (Zostera marina) tolerance to anoxia

    DEFF Research Database (Denmark)

    Pulido Pérez, Cristina; Borum, Jens

    2010-01-01

    The tolerance of eelgrass (Zostera marina L.) to anoxia was assessed experimentally to evaluate the potential role of short-term anoxia on eelgrass performance. Eelgrass ramets (terminal leaf bundles with rhizomes and roots) were submerged in anoxic seawater for variable periods of time (0.5 to 48...

  16. Deformación cuaternaria asociada al frente de levantamiento oriental de las sierras de Velasco y Ambato, Sierras Pampeanas occidentales

    Directory of Open Access Journals (Sweden)

    Analía L. Casa

    2010-12-01

    Full Text Available Sobre el frente oriental de la sierra de Velasco y extremo sur de la sierra de Ambato, Sierras Pampeanas Occidentales, se han hallado nuevas evidencias de actividad tectónica cuaternaria en cercanías de la ciudad de La Rioja. Los rasgos reconocidos corresponden a distintos tramos reactivados de las fallas que delimitan los frentes serranos y a estructuras que afectan los depósitos cuaternarios sobre el piedemonte. la sierra de Velasco Oriental se encuentra marginada por fallas de rumbo NNE e inclinación al ONO, mientras que la sierra de Ambato austral presenta estructuras de rumbo NE que inclinan al NO. En el bloque Carrizal estas direcciones se interfieren originando un sector de mayor complejidad estructural. La deformación observada evidencia la persistencia de un régimen compresivo durante el Cuaternario al que se asocian fallas inversas de vergencia oriental a sudoriental. Estas fallas continúan elevando los cordones serranos y constituyen potenciales fuentes sismogénicas.

  17. Perspectivas de la biología marina

    OpenAIRE

    Bigatti, G.

    2013-01-01

    La biología marina es una rama de las ciencias del mar de reciente desarrollo en la Argentina (oceáno Atlántico sudoccidental) que está en franco crecimiento. Se muestra un panorama del desarrollo de las diversas disciplinas, como los estudios sobre la biodiversidad marina y de la biología marina y pesquera, así como amenazas a los ambientes marinos y medidas de conservación tomadas. Se incluyen las perspectivas para futuros estudios de biología marina, los beneficios de las iniciativas de di...

  18. Perspectivas de la biología marina

    OpenAIRE

    Bigatti, G.

    2013-01-01

    La biología marina es una rama de las ciencias del mar de reciente desarrollo en la Argentina (oceáno Atlántico sudoccidental) que está en franco crecimiento. Se muestra un panorama del desarrollo de las diversas disciplinas, como los estudios sobre la biodiversidad marina y de la biología marina y pesquera, así como amenazas a los ambientes marinos y medidas de conservación tomadas. Se incluyen las perspectivas para futuros estudios de biología marina, los beneficios de las iniciativas de di...

  19. Marina Laikjõe : palm on eestlasele puhkuse sünonüüm / Marina Laikjõe

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2003-01-01

    Reisikorraldusfirma Domina World Traveli tegevjuht Marina Laikjõe annab ülevaate eestlaste reisimisharjumustest, populaarsematest sihtkohtadest ning prognoosib võimalikke trende Eesti turismiturul.

  20. Marina Laikjõe : palm on eestlasele puhkuse sünonüüm / Marina Laikjõe

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2003-01-01

    Reisikorraldusfirma Domina World Traveli tegevjuht Marina Laikjõe annab ülevaate eestlaste reisimisharjumustest, populaarsematest sihtkohtadest ning prognoosib võimalikke trende Eesti turismiturul.

  1. Marina Kaljurand : Venemaad ei tohi karta! Siin pole midagi karta! / Marina Kaljurand ; interv. Jaanus Piirsalu

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2008-01-01

    Intervjuu kolm aastat Moskvas töötanud Eesti suursaadiku Marina Kaljurannaga, kes vastab küsimustele, mis puudutavad Eesti-Vene suhteid, saadikutööd, diplomaatiat, aprillirahutusi, naiste osakaalu diplomaatide seas ja erilisi suhteid patriarh Aleksius II-ga

  2. Marina Kaljurand : Venemaad ei tohi karta! Siin pole midagi karta! / Marina Kaljurand ; interv. Jaanus Piirsalu

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2008-01-01

    Intervjuu kolm aastat Moskvas töötanud Eesti suursaadiku Marina Kaljurannaga, kes vastab küsimustele, mis puudutavad Eesti-Vene suhteid, saadikutööd, diplomaatiat, aprillirahutusi, naiste osakaalu diplomaatide seas ja erilisi suhteid patriarh Aleksius II-ga

  3. 33 CFR 80.1124 - Ventura Marina, CA.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Ventura Marina, CA. 80.1124 Section 80.1124 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY INTERNATIONAL NAVIGATION RULES COLREGS DEMARCATION LINES Pacific Coast § 80.1124 Ventura Marina, CA. A line drawn...

  4. Contaminación marina en el Perú.

    OpenAIRE

    Guillen., Oscar; Ashtu, Victor; Aquino, Rosa

    1980-01-01

    Este informe muestra las principales causas de contaminación marina debido a los desechos domésticos e industriales, hidrocarburos de petroleo a fin de mostrar la situación actual de la contaminación marina.

  5. Contaminación marina en el Perú.

    OpenAIRE

    Guillen., Oscar; Ashtu, Victor; Aquino, Rosa

    1980-01-01

    Este informe muestra las principales causas de contaminación marina debido a los desechos domésticos e industriales, hidrocarburos de petroleo a fin de mostrar la situación actual de la contaminación marina.

  6. Armastus teeb tugevaks / Marina Laikjõe ; interv. Verni Leivak

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2008-01-01

    Turismifirma Tez Tour tegevjuht ning reisifirma Travel-In juht Marina Laikjõe vastab küsimustele, mis puudutavad tema tegevust ja karjääri turisminduses, suhteid kolleegidega ning perekonna toetust raske haigusega võitlemise ajal. Kommenteerivad Reet Kivi, Tiit Pärnik. Lisa: Marina Laikjõe

  7. 33 CFR 110.111 - Marina del Rey Harbor, Calif.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Marina del Rey Harbor, Calif. 110.111 Section 110.111 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Special Anchorage Areas § 110.111 Marina del Rey Harbor, Calif. An area in the main channel within the...

  8. Armastus teeb tugevaks / Marina Laikjõe ; interv. Verni Leivak

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2008-01-01

    Turismifirma Tez Tour tegevjuht ning reisifirma Travel-In juht Marina Laikjõe vastab küsimustele, mis puudutavad tema tegevust ja karjääri turisminduses, suhteid kolleegidega ning perekonna toetust raske haigusega võitlemise ajal. Kommenteerivad Reet Kivi, Tiit Pärnik. Lisa: Marina Laikjõe

  9. Sulfide intrusion and detoxification in Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Holmer, Marianne

    2014-01-01

    nutrition in general. By a global review of sulfide intrusion, coupled with a series of field studies and in situ experiments we elucidate sulfide intrusion and different strategies of seagrasses to sustain sulfide intrusion. Using stable isotope tracing, scanning electron microscopy with x-ray analysis...... indicating a possible role of sulfide in the sulfur nutrition beside the detoxification function. Our results suggest different adaptations of Z. marina to reduced sediments and sulfide intrusion ranging from bacterial and chemical reoxidation of sulfide to sulfate to incorporation of sulfide into organic...

  10. De serpientes marinas y otros monstruos

    OpenAIRE

    1994-01-01

    A mediados de marzo del corriente año distintos medios informaron que en el paraje Arenas Verdes, cerca de la Iocalidad bonaerense de Necochea, se había avistado una especie de "serpiente marina". Más de treinta personas habrían observado un animal “con cabeza de tortuga sostenida por un larguísimo cuello parecido al de un cisne y con aletas a lo largo iguales a las de los dinosaurios". Para otros testigos, se trataría de un animal con "un lomo enorme... de mas o menos tres metros de largo. T...

  11. La dinámica marina

    OpenAIRE

    2003-01-01

    En este trabajo se realiza una revisión general de los aspectos generales de la dinámica marina, especialmente centrado en playas y la parte más cercana a la costa de la plataforma. Es evidente que la dinámica de erosión, transporte y depósito de sedimentos, jugará un papel fundamental en la removilización de contaminantes. Formas de acumulación más profundas, jugarán un papel fundamental como reservónos de contaminantes. También es importante, ...

  12. Blue carbon stocks in Baltic Sea eelgrass (Zostera marina) meadows

    DEFF Research Database (Denmark)

    Rohr, Maria Emilia; Bostrom, Christoffer; Canal-Vergés, Paula;

    2016-01-01

    Although seagrasses cover only a minor fraction of the ocean seafloor, their carbon sink capacity accounts for nearly one-fifth of the total oceanic carbon burial and thus play a critical structural and functional role in many coastal ecosystems. We sampled 10 eelgrass (Zostera marina) meadows...... density, porosity and silt content. In addition, our analysis show that the root : shoot ratio of Z. marina explained >12% and the contribution of Z. marina detritus to the sediment surface C-org pool explained >10% of the variation in the C-org stocks. The mean monetary value for the present carbon...

  13. Marina Tsvetaeva, Les Carnets. 1913-1939

    Directory of Open Access Journals (Sweden)

    Katia Vandenborre

    2009-10-01

    Full Text Available Entrevoir le quotidien de Marina Cvetaeva avant son éternité, approcher sa personne avant sa personnalité, tout en remontant aux sources impossibles de sa création, tels sont les défis de la publication de ses Carnets.Ces quinze carnets réunissent en un volume vingt-six ans de notes, esquisses poétiques, extraits de lettres, chroniques du quotidien, listes de courses, réflexions. Ils commencent en 1913, Tsvetaeva étant alors une jeune mère de 21 ans, traversent les années de dénuement et d’ex...

  14. Genetic variation of mangrove species Avicennia marina in Iran ...

    African Journals Online (AJOL)

    STORAGESEVER

    2008-09-03

    Sep 3, 2008 ... Key words: Avicennia marina, genetic variation, Iran, microsatellite, ... conservation and sustainable management of mangrove .... Western Australia, New South Wales and South Africa) ... evolutionary geographic center of mangrove forests of ... environment constrains, as well as ecological factors may.

  15. Esteroles libres de la estrella marina echinaster sentus

    Directory of Open Access Journals (Sweden)

    Rosabel Segura de Correa

    2010-05-01

    Full Text Available La fracción lipídica de la estrella marina Echinaster sentus se estudió para conocer su composición esterólica. Las estrellas marinas son especies de invertebrados-que pertenecen al phylumechinodermata de la clase Asteroidea. Poseen entre otros componentes esteroides de tipo saponina, esteróles libres polihidroxilados y monohidroxilados.

  16. Bioaccumulation of trace elements by Avicennia marina

    Directory of Open Access Journals (Sweden)

    Kandasamy Kathiresan

    2014-11-01

    Full Text Available Objective: To analyze the concentrations of 12 micro-nutrients (Al, B, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb, and Zn in different plant parts of Avicennia marina and its rhizosphere soil of the south east coast of India. Methods: The samples were acid digested, then analyzed by using inductively coupled plasma system (ICP-Optical Emission Spectrophotometer. Results: Levels of metals were found in the decreasing order: Cd>Co>Ni>Pb>B >Cr>Zn>Mg>Mn>Cu>Fe>Al. The soil held more levels of metals than plant parts, but within the permissible limits of concentration. Bark and root accumulated higher levels of trace elements in a magnitude of 10-80 folds than other plant parts. The overall bioaccumulation factor in the sampling sites of Vellar, Pichavaram and Cuddalore was 2.88, 1.42 0.47 respectively. Essential elements accumulate high in mature mangroves forest while non-essential elements accumulate high in the industrially polluted mangroves. Conclusions: The ratio between essential and non-essential elements was found higher in young mangrove forest than that in mature mangrove forest and polluted mangrove areas. Thus, the ratio of accumulation can be used as an index of the growth and pollution status of mangroves.

  17. Bioaccumulation of trace elements by Avicennia marina

    Institute of Scientific and Technical Information of China (English)

    Kandasamy Kathiresan; Kandasamy Saravanakumar; Pandiyan Mullai

    2014-01-01

    Objective: To analyze the concentrations of 12 micro-nutrients (Al, B, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb, and Zn) in different plant parts of Avicennia marina and its rhizosphere soil of the south east coast of India. Methods: The samples were acid digested, then analyzed by using inductively coupled plasma system (ICP-Optical Emission Spectrophotometer). Results: Levels of metals were found in the decreasing order: Cd>Co>Ni>Pb>B>Cr>Zn>Mg>Mn>Cu>Fe>Al. The soil held more levels of metals than plant parts, but within the permissible limits of concentration. Bark and root accumulated higher levels of trace elements in a magnitude of 10-80 folds than other plant parts. The overall bioaccumulation factor in the sampling sites of Vellar, Pichavaram and Cuddalore was 2.88, 1.42 0.47 respectively. Essential elements accumulate high in mature mangroves forest while non-essential elements accumulate high in the industrially polluted mangroves. Conclusions:The ratio between essential and non-essential elements was found higher in young mangrove forest than that in mature mangrove forest and polluted mangrove areas. Thus, the ratio of accumulation can be used as an index of the growth and pollution status of mangroves.

  18. Evaluating the antibacterial and anticandidal potency of mangrove, Avicennia marina

    Directory of Open Access Journals (Sweden)

    Aseer Manilal

    2016-02-01

    Full Text Available Objective: To evaluate the antibiotic activity of mangrove plant, Avicennia marina (A. marina against human and shrimp pathogens and to delineate bioactive constituents by gas chromatography-mass spectrometer (GC-MS profiling. Methods: The antimicrobial activity of the different polar and non-polar extracts of A. marina was inspected by well diffusion technique against 16 bacterial pathogens and two fungal pathogens. Results: Of the six organic extracts examined, methanolic extract of A. marina fairly repressed the growth of all bacterial and fungal pathogenic strains tested. In general, mangrove extract was more active against the bacterial pathogens while against yeasts, the activity was lesser. The antibiotic activity was attributed to the presence of diverse bioactive secondary metabolites. The chemical profiling of the methanolic extract was performed by GC combined with mass spectrometry. The results of GC-MS showed that the main phytoconstituents were benzeneethanol,4-hydroxy- (RT = 12.173, followed by benzaldehyde,3-methyl- (RT = 6.811. Finally, the GC-MS data evinced that the antimicrobial activity of A. marina was due to the synergistic effect of all constituents or the activity of major constituents. Conclusions: Considering the urgent need of novel antibiotics, the present study brings out a new insight on the exploration of mangroves for antibiotic production in future.

  19. 76 FR 37650 - Safety Zone; 4th of July Festival Berkeley Marina Fireworks Display Berkeley, CA

    Science.gov (United States)

    2011-06-28

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; 4th of July Festival Berkeley Marina... Berkeley Pier, Berkeley, CA in support of the 4th of July Festival Berkeley Marina Fireworks Display... used in the fireworks display. Background and Purpose The City of Berkeley Marina will sponsor the 4th...

  20. Tres grandes plataformas marinas Mar del Norte

    Directory of Open Access Journals (Sweden)

    Soulas, R.

    1978-03-01

    Full Text Available This article analyzes the different building stages of three large sea platforms. After studying the structure's main characteristics, preparing scale models and calculating ail the elements, platform construction was carried out in three stages: — Dry-dock construction of the hull base. — Installation in the water and finishing the structure. — Immersion and bridge installation. Finally, the necessary operations to move the platform to its definite location were carried out. The structures are formed by a parallelepiped hull of reinforced concrete, divided into compartments by means of vertical orthogonals panels on top of which 2 or 4 piles are placed to support the bridge.

    En este artículo se analizan las diversas etapas en la realización de tres grandes plataformas marinas. Después de un estudio de las características principales de la estructura, ensayos en modelo reducido y cálculo de todos los elementos, se procede a la construcción de las plataformas en tres fases: — Construcción en seco de la base del casco. — Colocación en el agua y acabado de la estructura. — Inmersión y colocación del puente. Por último, se realizan las operaciones necesarias para llevar la plataforma a su ubicación definitiva. Las estructuras están formadas por un casco paralelepipédico de hormigón armado, dividido en compartimientos mediante tabiques verticales ortogonales y sobre el que se han colocado 2 ó 4 pilas que soportan el puente.

  1. El progreso de las mujeres en la marina mercante

    OpenAIRE

    Abad Zuluaga, Leire

    2015-01-01

    ¿Cuántas mujeres se dedican al transporte marítimo? ¿Qué puestos ocupan? Este trabajo da respuesta a muchas preguntas de este tipo. Hablaremos primero de la participación de las mujeres en la Marina Mercante recopilando información de libros, publicaciones y diferentes organizaciones. Para concluir se mostrará una entrevista en profundidad realizada a una Capitana de la Marina Mercante, reuniendo sus puntos de vista sobre la igualdad real entre hombres y mujeres.

  2. Litter fall and decomposition of mangrove species Avicennia marina ...

    African Journals Online (AJOL)

    Department of Biological Sciences, Eduardo Mondlane University, PO Box 257, Maputo, ... marina, the average time required to lose half of the initial AFDW (t0,5) was 96 days ... 2008, precipitation varies from the extremes ..... mm) as shown by a 10 year meteorological .... mangrove leaf litter in tropical Australia. J. Exp. Mar.

  3. Marina Abramović on kohal / Bianka Marran

    Index Scriptorium Estoniae

    Marran, Bianka

    2010-01-01

    Jugoslaavia kunstniku Marina Abramovići performance'itest. Pikemalt tema teosest "The Artist is Present" New Yorgi Moodsa Kunsti Muuseumis 14. märtsist 31. maini 2010. Koostööst saksa fotograafi ja performance'ikunstniku Ulay'ga (kodanikunimi Frank Uwe Laysiepen)

  4. Marina Abramović on kohal / Bianka Marran

    Index Scriptorium Estoniae

    Marran, Bianka

    2010-01-01

    Jugoslaavia kunstniku Marina Abramovići performance'itest. Pikemalt tema teosest "The Artist is Present" New Yorgi Moodsa Kunsti Muuseumis 14. märtsist 31. maini 2010. Koostööst saksa fotograafi ja performance'ikunstniku Ulay'ga (kodanikunimi Frank Uwe Laysiepen)

  5. A New Acylated Iridoid Glucoside from Avicennia marina

    Institute of Scientific and Technical Information of China (English)

    Yan FENG; Xiao Ming LI; Xiao Juan DUAN; Bin Gui WANG

    2006-01-01

    A new acylated iridoid glucoside, namely, 2'-O-(5-phenyl-2E, 4E-pentadienoyl)-mussaenosidic acid, was isolated from the aerial parts of the mangrove plant Avicennia marina.The structure of the new compound was established on the basis of various NMR spectroscopic analyses, including 2D NMR techniques (1H-1H COSY, HMQC, and HMBC) and HR-FAB-MS.This compound displayed moderate antioxidant activity.

  6. Effects of salinity and nutrient load and their interaction on Zostera marina

    NARCIS (Netherlands)

    Van Katwijk, M.; Schmitz, G.; Gasseling, A.P.; Van Avesaath, P.H.

    1999-01-01

    Generally, seagrass Zostera marina L. distribution in the Wadden Sea and south-west Netherlands is Limited to waters with low to moderate nutrient concentrations. However, it is known that Z. marina also occurs at high nutrient concentrations when growing in low salinity environments. In this study,

  7. 78 FR 29022 - Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA

    Science.gov (United States)

    2013-05-17

    ... SECURITY Coast Guard 33 CFR Part 165 Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA... enforce the safety zone for the Berkeley Marina Fourth of July Fireworks display in the Captain of the... Berkeley Pier in approximate position 37 51'40'' N, 122 19'19'' W (NAD 83) from 9:30 p.m. until 10:15...

  8. Role of commercial harbours and recreational marinas in the spread of non-indigenous fouling species.

    Science.gov (United States)

    Ferrario, Jasmine; Caronni, Sarah; Occhipinti-Ambrogi, Anna; Marchini, Agnese

    2017-09-01

    The role of commercial harbours as sink and source habitats for non-indigenous species (NIS) and the role of recreational boating for their secondary spread were investigated by analysing the fouling community of five Italian harbours and five marinas in the western Mediterranean Sea. It was first hypothesised that NIS assemblages in the recreational marinas were subsets of those occurring in commercial harbours. However, the data did not consistently support this hypothesis: the NIS pools of some marinas significantly diverged from harbours even belonging to the same coastal stretches, including NIS occurring only in marinas. This study confirms harbours as hotspots for marine NIS, but also reveals that numbers of NIS in some marinas is higher than expected, suggesting that recreational vessels effectively facilitate NIS spread. It is recommended that this vector of NIS introduction is taken into account in the future planning of sustainable development of maritime tourism in Europe.

  9. The Phenomenon of the Marina Development to Support the European Model of Economic Development

    Directory of Open Access Journals (Sweden)

    Joanna Kizielewicz

    2013-09-01

    Full Text Available The development of marinas on the seas, rivers, lakes and canals of Europe occurs in two different forms: (1 as a private investment project, and (2 as an urban municipal investment. Both forms of investment and development of marinas satisfy the criteria of entrepreneurship, which is important for each global and European economy. The purpose of this research is explanation of the possibilities for development of marinas and their immediate and distant destination which supports the development of the local economy. The scientific and research achievements were applied and, for the purpose of transparency, a case study showing several marinas and the examples of two basic models of development are presented. Structurally, this research consists of two parts, namely (1 a theoretical part, where a definition of nautical tourism and its classification are presented and (2 the development of specific indicators of marinas in Europe are explored.

  10. Blue carbon stocks in Baltic Sea eelgrass (Zostera marina) meadows

    Science.gov (United States)

    Röhr, Maria Emilia; Boström, Christoffer; Canal-Vergés, Paula; Holmer, Marianne

    2016-11-01

    Although seagrasses cover only a minor fraction of the ocean seafloor, their carbon sink capacity accounts for nearly one-fifth of the total oceanic carbon burial and thus play a critical structural and functional role in many coastal ecosystems. We sampled 10 eelgrass (Zostera marina) meadows in Finland and 10 in Denmark to explore seagrass carbon stocks (Corg stock) and carbon accumulation rates (Corg accumulation) in the Baltic Sea area. The study sites represent a gradient from sheltered to exposed locations in both regions to reflect expected minimum and maximum stocks and accumulation. The Corg stock integrated over the top 25 cm of the sediment averaged 627 g C m-2 in Finland, while in Denmark the average Corg stock was over 6 times higher (4324 g C m-2). A conservative estimate of the total organic carbon pool in the regions ranged between 6.98 and 44.9 t C ha-1. Our results suggest that the Finnish eelgrass meadows are minor carbon sinks compared to the Danish meadows, and that majority of the Corg produced in the Finnish meadows is exported. Our analysis further showed that > 40 % of the variation in the Corg stocks was explained by sediment characteristics, i.e. dry density, porosity and silt content. In addition, our analysis show that the root : shoot ratio of Z. marina explained > 12 % and the contribution of Z. marina detritus to the sediment surface Corg pool explained > 10 % of the variation in the Corg stocks. The mean monetary value for the present carbon storage and carbon sink capacity of eelgrass meadows in Finland and Denmark, were 281 and 1809 EUR ha-1, respectively. For a more comprehensive picture of seagrass carbon storage capacity, we conclude that future blue carbon studies should, in a more integrative way, investigate the interactions between sediment biogeochemistry, seascape structure, plant species architecture and the hydrodynamic regime.

  11. Exposiciones. Esculturas de Marina Núñez del Prado

    Directory of Open Access Journals (Sweden)

    Eduardo Mendoza Varela

    1961-05-01

    Full Text Available Hace varios años Gabriela Mistral en unas cuantas palabras que han quedado también entre las mejores páginas, expresó lo que significaba la aparición de Marina Núñez del Prado en el arte de Latinoamérica. En efecto, no era solamente profética la voz de la gran poetisa chilena al señalar en la artista boliviana a una de las figuras más nítidas y altas de la plástica continental.

  12. Deformación cuaternaria asociada al frente de levantamiento oriental de las sierras de Velasco y Ambato, Sierras Pampeanas occidentales Quaternary deformation associated with the eastern uplift front of the Sierras de Velasco and Ambato, western Sierras Pampeanas

    Directory of Open Access Journals (Sweden)

    Analía L. Casa

    2010-12-01

    Full Text Available Sobre el frente oriental de la sierra de Velasco y extremo sur de la sierra de Ambato, Sierras Pampeanas Occidentales, se han hallado nuevas evidencias de actividad tectónica cuaternaria en cercanías de la ciudad de La Rioja. Los rasgos reconocidos corresponden a distintos tramos reactivados de las fallas que delimitan los frentes serranos y a estructuras que afectan los depósitos cuaternarios sobre el piedemonte. la sierra de Velasco Oriental se encuentra marginada por fallas de rumbo NNE e inclinación al ONO, mientras que la sierra de Ambato austral presenta estructuras de rumbo NE que inclinan al NO. En el bloque Carrizal estas direcciones se interfieren originando un sector de mayor complejidad estructural. La deformación observada evidencia la persistencia de un régimen compresivo durante el Cuaternario al que se asocian fallas inversas de vergencia oriental a sudoriental. Estas fallas continúan elevando los cordones serranos y constituyen potenciales fuentes sismogénicas.Along the eastern front of the Sierra de Velasco and at the southern end of the Sierra de Ambato, western Sierras Pampeanas, have been found new evidences of Quaternary tectonic activity near La Rioja city. Observed evidences correspond to different reactivated sections of the faults that bound the mountain fronts, as well as to structures affecting the Quaternary deposits on the piedmont. The bounding faults of the Sierra de Velasco Oriental-front exhibit a NNE trend and WNW dip, while structures at the southernmost Ambato range are characterized by NE trend and NW dip. The neotectonic faults of the El Carrizal block are the result of the interference of both structural trends, resulting in a sector with higher structural complexity. The here described deformation show the persistence of a compressive regime during the Quaternary, with eastern to southeastern verging reverse faults. It is considering that these faults are driving the current uplift of the mountain

  13. Diurnal effects of anoxia on the metabolome of the seagrass Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Holmer, Marianne; Weckwerth, Wolfram

    2014-01-01

    Environmental metabolomics has become interesting in marine ecological studies. One example is the revealing of new insights in stress response of Zostera marina. This is essential to understand how, at which level and to what extend aquatic plants adapt, tolerate and react to environmental...... stressors. We exposed Z. marina to water column anoxia and assessed the diurnal metabolomic response by GC-TOF-MS based metabolomics identifying 109 known and 217 unknown metabolites. During day time photosynthetic oxygen production prevents severe effects of anoxia on the metabolome (complete set of small...... the applicability of metabolomics to assess environmental stress responses of Zostera marina....

  14. Diurnal effects of anoxia on the metabolome of the seagrass Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Fragner, Lena; Holmer, Marianne

    2015-01-01

    We investigated the response, adaptation and tolerance mechanisms of the temperate seagrass Zostera marina to water column anoxia. We exposed Z. marina to a diurnal light/dark cycle under anoxia and assessed the metabolic response by measuring the metabolome with gas chromatography coupled to mass...... shunt as such mitigation mechanisms that alleviate pyruvate levels and lead to carbon and nitrogen storage during anoxia. This work demonstrates the applicability of metabolomics to assess low oxygen stress responses of Z. marina and allows us to propose an anoxia recovery model....

  15. Population specific salinity tolerance in eelgrass (Zostera marina)

    DEFF Research Database (Denmark)

    Salo, Tiina Elina; Pedersen, Morten Foldager; Boström, Christoffer

    2014-01-01

    Salinity is one of the main factors impacting distribution of marine plants and sub-optimal salinities may result in increased resource use and decreased production.We studied the performance and salinity tolerance of eelgrass (Zostera marina L.) originating from two regions with different ambient...... salinities: a low saline (salinity 6) and a high saline (salinity 20) population. Plants fromboth populationswere exposed to a series of fixed salinities (2, 4, 6, 9, 12.5, 15, 20 and 25) for 5 weeks. Both plant origin and salinity affected plant performance significantly. Plant production decreasedwith...... decreasing salinity in both populations,while mortality increased in lowsalinity only in plants originating from the high saline population. The better performance of the low saline population in the lowest salinities indicates a horizontal shift in salinity tolerance among populationswith different origin...

  16. Eelgrass (Zostera marina) food web structure in different environmental settings

    DEFF Research Database (Denmark)

    Thormar, Jonas; Hasler-Sheetal, Harald; Baden, Susanne

    2016-01-01

    his study compares the structure of eelgrass (Zostera marina L.) meadows and associated food webs in two eelgrass habitats in Denmark, differing in exposure, connection to the open sea, nutrient enrichment and water transparency. Meadow structure strongly reflected the environmental conditions...... composition and food web structure also differed markedly between sites with the eutrophicated, enclosed site having higher biomass of consumers and less complex food web. These relationships resulted in a column shaped biomass distribution of the consumers at the eutrophicated site whereas the less nutrient......-rich site showed a pyramidal biomass distribution of consumers coupled with a more diverse consumer community. The differences in meadow and food web structure of the two seagrass habitats, suggest how physical setting may shape ecosystem response and resilience to anthropogenic pressure. We encourage...

  17. Marina Caffiero (Hg.: Rubare le anime. Roma: Viella 2008

    Directory of Open Access Journals (Sweden)

    Rita Unfer Lukoschik

    2009-07-01

    Full Text Available In den Akten des päpstlichen Staatsarchivs und der römischen jüdischen Gemeinde finden sich zeitgenössische Zeugnisse für die im päpstlichen Rom vom 16. bis zum 19. Jahrhundert nicht seltene Zwangskonvertierung jüdischer Mädchen und Frauen zum Katholizismus. Eines der wertvollsten Dokumente dieser Konversionspraxis liegt nunmehr in einer kommentierten Neuedition vor: das Tagebuch der 1749 sich erfolgreich der versuchten Zwangskonvertierung widersetzenden 18-jährigen Anna del Monte. In ihrer Einleitung ordnet die Herausgeberin Marina Caffiero dieses außergewöhliche Einzelschicksal in die zeitgleich und parallel laufenden Assimilations- und Emanzipationsprozesse ein, die sich in der mit aufklärerischem Gedankengut ‚infizierten‘ jüdischen Oberschicht Roms im 18. Jahrhundert abzeichneten.Contemporary reports on the forced conversion of Jewish girls and woman to Catholicism, not a rare occurrence in papal Rome from the 16th to the 19th centuries, can be found in the files of the official papal archive and the Roman Jewish community. One of the most valuable documents of this conversion practice has now been published in a new annotation edition: The diary of 18-year-old Anna del Monte, who was able to successfully resist the attempted forced conversion in 1749. In her introduction the editor Marina Caffiero places this extraordinary individual fate within the concurrent and parallel processes of assimilation and emancipation. These emerge in 18th century Rome’s Jewish upper class, which was “infected” with Enlightenment ideas.

  18. Assessment of Marinas in the Mediterranean and the Position of Turkey

    Directory of Open Access Journals (Sweden)

    Evrim Pinar Genc

    2006-05-01

    Full Text Available The most important organizations for developing and advertisingthe yacht tourism in a country are the marinas.Yachting tourism, being a part of maritime sector tends to playa part in the tourist activities and provides important resourcesfor the general economy.In this study, the developments in yachting tourism are aplainedby considering the cu"ent status of the marinas in theMedite"anean countries. Basic characteristics of different marinasof the Medite"anean countries will be discussed and alsostatistical figures will be given. The yachting routes and the potentialof Turkey will be analyzed by emphasizing operational,infrastructural and service characteristics. The factors thatshould be taken into consideration and the methods used formarina marketing will be explained. By considering strengths,weaknesses, opportunities and threats, a SWOT analysis will bemade for Turkey marinas. Suggestions will be given fur furtherdevelopment of marina management in Turkey.

  19. Baltoscandali avavad vigurmarss ja Schubert / Marina Steinmo ; interv. Eva Kübar

    Index Scriptorium Estoniae

    Steinmo, Marina

    2008-01-01

    Baltoscandali teatrifestivalil esineva Eesti päritolu Rootsi tantsija ja koreograafi Charlotte Engelkesi klassikalisel muusikal põhinevatest lavastustest "Forellen and Me" ja "Miss Very Wagner" (dramaturg, teksti ja etenduse kontseptsiooni autor on Marina Steinmo)

  20. Eelgrass (Zostera marina) Microsatellite DNA Data; Pacific Coast of North America, 2000-2009

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set contains genetic information collected from eelgrass (Zostera marina) populations along the Pacific coast of North America from Alaska to Baha...

  1. Iseseisvuse lubatavusest : Okasana Titova "Hamletis" ja Marina Kesleri "Libahundis" RO Estonias / Nele Suisalu

    Index Scriptorium Estoniae

    Suisalu, Nele

    2008-01-01

    Tantsuetendused "Hamlet" - lavastaja ja koreograaf Oksana Titova, muusika autor ja esitaja Taavi Kerkmäe ning "Libahunt" - lavastaja Marina Kesler, Lepo Sumera, Raimo Kangro, Arvo Pärdi ja Lydia Austeri muusikale. (2007. aasta 2. novembri etendusest)

  2. Baltoscandali avavad vigurmarss ja Schubert / Marina Steinmo ; interv. Eva Kübar

    Index Scriptorium Estoniae

    Steinmo, Marina

    2008-01-01

    Baltoscandali teatrifestivalil esineva Eesti päritolu Rootsi tantsija ja koreograafi Charlotte Engelkesi klassikalisel muusikal põhinevatest lavastustest "Forellen and Me" ja "Miss Very Wagner" (dramaturg, teksti ja etenduse kontseptsiooni autor on Marina Steinmo)

  3. Võssotski abikaasa Marina Vlady ei suuda kuulata omaaegset Vene laululegendi / Triin Tael

    Index Scriptorium Estoniae

    Tael, Triin

    2008-01-01

    Legendaarsel Vene lauljal, näitlejal ja luuletajal oleks 25. jaanuaril täitunud 70 eluaastat. Tema eraelust, naistest, pikemalt suhetest Iza Võssotskaja ja Marina Vladyga. Lisaks "Võssotski surm varjutas olümpiamängud"

  4. 77 FR 37604 - Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA

    Science.gov (United States)

    2012-06-22

    ... SECURITY Coast Guard 33 CFR Part 165 Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA... enforce the safety zone for the Berkeley Marina Fourth of July Fireworks display in the Captain of the... Berkeley Pier in position 37 51'40'' N, 122 19'19'' W (NAD 83) from 9:30 p.m. until 10:15 p.m. on July...

  5. Complete genome of Cobetia marina JCM 21022T and phylogenomic analysis of the family Halomonadaceae

    Science.gov (United States)

    Tang, Xianghai; Xu, Kuipeng; Han, Xiaojuan; Mo, Zhaolan; Mao, Yunxiang

    2016-09-01

    Cobetia marina is a model proteobacteria in researches on marine biofouling. Its taxonomic nomenclature has been revised many times over the past few decades. To better understand the role of the surface-associated lifestyle of C. marina and the phylogeny of the family Halomonadaceae, we sequenced the entire genome of C. marina JCM 21022T using single molecule real-time sequencing technology (SMRT) and performed comparative genomics and phylogenomics analyses. The circular chromosome was 4 176 300 bp with an average GC content of 62.44% and contained 3 611 predicted coding sequences, 72 tRNA genes, and 21 rRNA genes. The C. marina JCM 21022T genome contained a set of crucial genes involved in surface colonization processes. The comparative genome analysis indicated the significant diff erences between C. marina JCM 21022T and Cobetia amphilecti KMM 296 (formerly named C. marina KMM 296) resulted from sequence insertions or deletions and chromosomal recombination. Despite these diff erences, pan and core genome analysis showed similar gene functions between the two strains. The phylogenomic study of the family Halomonadaceae is reported here for the first time. We found that the relationships were well resolved among every genera tested, including Chromohalobacter, Halomonas, Cobetia, Kushneria, Zymobacter, and Halotalea.

  6. Effects of used lubricating oil on two mangroves Aegiceras corniculatum and Avicennia marina

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    An outdoor experiment was set up to investigate the effects of used lubricating oil (5 L/m2) on Aegiceras corniculatum Blanco. and Avicennia marina (Forsk) Vierh., two salt-excreting mangroves. A. marina was more sensitive to used lubricating oil than A. corniculatum and canopy-oiling resulted in more direct physical damage and stronger lethal effects than base-oiling. When treated with canopy-oiling, half of A. corniculatum plants survived for the whole treatment time (90 d); but, for A. marina, high mortality (83%) resulted from canopy-oiling within 3 weeks and no plants survived for 80 d. Base-oiling had no lethal effects on A. corniculatum plants even at the termination of this experiment, but 83% of A. marina plants died 80 d after treatment. Forty days after canopy-oiling, 93% of A. corniculatum leaves fell and no live leaves remained on A. marina plants. By the end of the experiment, base-oiling treatment resulted in about 45% of A. corniculatum leaves falling, while all A. marina leaves and buds were burned to die. Lubricating oil resulted in physiological damage to A. corniculatum leaves, including decreases in chlorophyll and carotenoid contents, nitrate reductase, peroxidase and superoxide dismutase activities, and increases in malonaldehyde contents. For both species, oil pollution significantly reduced leaf, root, and total biomass, but did not significantly affect stem biomass. Oil pollution resulted in damage to the xylem vessels of fine roots but not to those of mediate roots.

  7. Ecosystem Services of Avicennia marina in the Red Sea

    KAUST Repository

    Almahasheer, Hanan

    2016-12-01

    The Red Sea is an arid environment, without riverine inputs, oligotrophic waters and extreme temperature and salinity. Avicennia marina is the dominant vegetation in the shores of the Red Sea. However, little is known about their distribution, dynamics, and services. Therefore, the aim of this Ph.D. was to obtain the basic information needed to evaluate their role in the coastal ecosystems and quantify their services. With that objective we 1) estimated the past and present distribution of mangroves in the Red Sea, 2) investigated the growth, leave production and floration 3) examined the growth limiting factors 4) measured the nutrients and heavy metal dynamics in the leaves and 5) estimated carbon sequestration. We found an increase of about 12% in the last 41 years, which contrasts with global trends of decrease. The extreme conditions in the Red Sea contributed to limit their growth resulting in stunted trees. Hence, we surveyed Central Red Sea mangroves to estimate their node production with an average of 9.59 node y-1 then converted that number into time to have a plastochrone interval of 38 days. As mangroves are taller in the southern Red Sea where both temperature and nutrients are higher than the Central Red Sea, we assessed nutrient status Avicennia marina propagules and naturally growing leaves to find the leaves low in nutrient concentrations (N < 1.5 %, P < 0.09 %, Fe < 0.06) and that nutrients are reabsorbed before shedding the leaves (69%, 72% and 35% for N, P, and Fe respectively). As a result, we conducted a fertilization experiment (N, P, Fe and combinations) to find that iron additions alone led to significant growth responses. Moreover, we estimated their leaf production and used our previous estimates of both the total cover mangrove in the Red Sea along with plastochrone interval to assess their total nutrients flux per year to be 2414 t N, 139 t P and 98 t Fe. We found them to sequester 34 g m-2 y-1, which imply 4590 tons of carbon

  8. Current European Labyrinthula zosterae are not virulent and modulate seagrass (Zostera marina defense gene expression.

    Directory of Open Access Journals (Sweden)

    Janina Brakel

    Full Text Available Pro- and eukaryotic microbes associated with multi-cellular organisms are receiving increasing attention as a driving factor in ecosystems. Endophytes in plants can change host performance by altering nutrient uptake, secondary metabolite production or defense mechanisms. Recent studies detected widespread prevalence of Labyrinthula zosterae in European Zostera marina meadows, a protist that allegedly caused a massive amphi-Atlantic seagrass die-off event in the 1930's, while showing only limited virulence today. As a limiting factor for pathogenicity, we investigated genotype × genotype interactions of host and pathogen from different regions (10-100 km-scale through reciprocal infection. Although the endophyte rapidly infected Z. marina, we found little evidence that Z. marina was negatively impacted by L. zosterae. Instead Z. marina showed enhanced leaf growth and kept endophyte abundance low. Moreover, we found almost no interaction of protist × eelgrass-origin on different parameters of L. zosterae virulence/Z. marina performance, and also no increase in mortality after experimental infection. In a target gene approach, we identified a significant down-regulation in the expression of 6/11 genes from the defense cascade of Z. marina after real-time quantitative PCR, revealing strong immune modulation of the host's defense by a potential parasite for the first time in a marine plant. Nevertheless, one gene involved in phenol synthesis was strongly up-regulated, indicating that Z. marina plants were probably able to control the level of infection. There was no change in expression in a general stress indicator gene (HSP70. Mean L. zosterae abundances decreased below 10% after 16 days of experimental runtime. We conclude that under non-stress conditions L. zosterae infection in the study region is not associated with substantial virulence.

  9. Eelgrass (Zostera marina Food Web Structure in Different Environmental Settings.

    Directory of Open Access Journals (Sweden)

    Jonas Thormar

    Full Text Available This study compares the structure of eelgrass (Zostera marina L. meadows and associated food webs in two eelgrass habitats in Denmark, differing in exposure, connection to the open sea, nutrient enrichment and water transparency. Meadow structure strongly reflected the environmental conditions in each habitat. The eutrophicated, protected site had higher biomass of filamentous algae, lower eelgrass biomass and shoot density, longer and narrower leaves, and higher above to below ground biomass ratio compared to the less nutrient-enriched and more exposed site. The faunal community composition and food web structure also differed markedly between sites with the eutrophicated, enclosed site having higher biomass of consumers and less complex food web. These relationships resulted in a column shaped biomass distribution of the consumers at the eutrophicated site whereas the less nutrient-rich site showed a pyramidal biomass distribution of consumers coupled with a more diverse consumer community. The differences in meadow and food web structure of the two seagrass habitats, suggest how physical setting may shape ecosystem response and resilience to anthropogenic pressure. We encourage larger, replicated studies to further disentangle the effects of different environmental variables on seagrass food web structure.

  10. Eelgrass (Zostera marina) Food Web Structure in Different Environmental Settings.

    Science.gov (United States)

    Thormar, Jonas; Hasler-Sheetal, Harald; Baden, Susanne; Boström, Christoffer; Clausen, Kevin Kuhlmann; Krause-Jensen, Dorte; Olesen, Birgit; Rasmussen, Jonas Ribergaard; Svensson, Carl Johan; Holmer, Marianne

    2016-01-01

    This study compares the structure of eelgrass (Zostera marina L.) meadows and associated food webs in two eelgrass habitats in Denmark, differing in exposure, connection to the open sea, nutrient enrichment and water transparency. Meadow structure strongly reflected the environmental conditions in each habitat. The eutrophicated, protected site had higher biomass of filamentous algae, lower eelgrass biomass and shoot density, longer and narrower leaves, and higher above to below ground biomass ratio compared to the less nutrient-enriched and more exposed site. The faunal community composition and food web structure also differed markedly between sites with the eutrophicated, enclosed site having higher biomass of consumers and less complex food web. These relationships resulted in a column shaped biomass distribution of the consumers at the eutrophicated site whereas the less nutrient-rich site showed a pyramidal biomass distribution of consumers coupled with a more diverse consumer community. The differences in meadow and food web structure of the two seagrass habitats, suggest how physical setting may shape ecosystem response and resilience to anthropogenic pressure. We encourage larger, replicated studies to further disentangle the effects of different environmental variables on seagrass food web structure.

  11. Auditing a flooded quarry prior to marina development

    Science.gov (United States)

    Baillie, Priscilla W.

    1992-07-01

    Development of a marina in a flooded brownstone quarry will require construction of a canal to the Connecticut River through an isthmus separating the two systems. An environmental audit over a 16-month period developed quantitative limnological data required by regulatory agencies. The deep quarry basin, protected by high sandstone walls, became strongly stratified in summer. Development of littoral vegetation in the quarry was prevented by the steep sides of the basin. Unusual characteristics of the manmade quarry basin, compared to most natural lakes in Connecticut, included a mean depth of 14 m, an intense thermocline, and negative heterograde oxygen profiles with metalimnetic minima. Alkalinity, conductivity, and nutrient levels differed significantly between the quarry and the river. Mean chlorophyll a concentrations in the two systems were similar, but the distribution of phytoplankton classes were quite different. The environmental audit, by comparing physical, chemical, and biological characteristics of the quarry to those of the river, allowed prediction of changes in trophic status when the two systems are joined.

  12. Thiohalocapsa marina sp. nov., from an Indian marine aquaculture pond.

    Science.gov (United States)

    Anil Kumar, P; Srinivas, T N R; Thiel, V; Tank, M; Sasikala, Ch; Ramana, Ch V; Imhoff, J F

    2009-09-01

    A spherical-shaped, phototrophic, purple sulfur bacterium was isolated in pure culture from anoxic sediment in a marine aquaculture pond near Bheemli (India). Strain JA142T is Gram-negative and non-motile. It has a requirement for NaCl (optimum of 2% and maximum of 6% w/v NaCl). Intracellular photosynthetic membranes are of the vesicular type. In vivo absorption spectra indicate the presence of bacteriochlorophyll a and carotenoids of the okenone series as photosynthetic pigments. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA142T is related to halophilic purple sulfur bacteria of the genera Thiohalocapsa and Halochromatium, with the highest sequence similarity to Thiohalocapsa halophila DSM 6210T (97.5%). Morphological and physiological characteristics differentiate strain JA142T from other species of the genera Halochromatium and Thiohalocapsa. Strain JA142T is sufficiently different from Thiohalocapsa halophila based on 16S rRNA gene sequence analysis and morphological and physiological characteristics to allow the proposal of a novel species, Thiohalocapsa marina sp. nov., with the type strain JA142T (=JCM 14780T=DSM 19078T).

  13. Artificial seed germination and seedling production ofZostera marina L. by salinity manipulation

    Institute of Scientific and Technical Information of China (English)

    LIU Yunlong; ZHANG Xuelei; SONG Wei; WANG Zongling

    2016-01-01

    Vast declines inZostera marina seagrass beds demand effective methods of rehabilitation. In this study, we developed a practical method by reducing salinity to induce seed germination followed with recovering salinity to facilitate seedling production ofZ. marina. The results showed thatZ. marina seeds collected from natural seawater (salinity 30) were induced to germinate at reduced salinities. Percent germination (GR) was higher and mean-time-to-germinate (MTG) was shorter at lower salinities. The highestGR and shortestMTG occurred at salinity 0 (deionized freshwater). After germination in freshwater, seeds could develop into seedlings at salinities 5–30 and continue the growth. Viability or development of germinated seeds was not significantly different during the 40 d of post-germination incubation at salinities 5–15 after 1–20 d of germination in freshwater. However, during the process of translating germinated seeds from salinity 0 and 5 to salinity 30, reducing the gradients of post-germination acclimation facilitated more seeds forming seedlings in less time. On average, after 60 d of static incubation, including 20 d in freshwater for germination followed with immediate shift to salinity 5 and increasing to salinity 30 at increment of 5 every two days until cultivation at constant salinity 30, 33% ofZ. marina seeds produced healthy seedlings. The results indicate that the salinity-manipulation based method of artificial germination and seedling production is practical and effective in supporting rehabilitation ofZ. marina bed.

  14. Occurrence and distribution of polycyclic aromatic hydrocarbons in surface sediments of San Diego Bay marinas.

    Science.gov (United States)

    Neira, Carlos; Cossaboon, Jennifer; Mendoza, Guillermo; Hoh, Eunha; Levin, Lisa A

    2017-01-15

    Polycyclic aromatic hydrocarbons (PAHs) have garnered much attention due to their bioaccumulation, carcinogenic properties, and persistence in the environment. Investigation of the spatial distribution, composition, and sources of PAHs in sediments of three recreational marinas in San Diego Bay, California revealed significant differences among marinas, with concentrations in one site exceeding 16,000ngg(-1). 'Hotspots' of PAH concentration suggest an association with stormwater outfalls draining into the basins. High-molecular weight PAHs (4-6 rings) were dominant (>86%); the average percentage of potentially carcinogenic PAHs was high in all sites (61.4-70%) but ecotoxicological risks varied among marinas. Highly toxic benzo(a)pyrene (BaP) was the main contributor (>90%) to the total toxic equivalent quantity (TEQ) in marinas. PAHs in San Diego Bay marina sediments appear to be derived largely from pyrogenic sources, potentially from combustion products that reach the basins by aerial deposition and stormwater drainage from nearby streets and parking lots. Copyright © 2016 Elsevier Ltd. All rights reserved.

  15. EKSPEKTASI DAN PERSEPSI WISATAWAN TERHADAP KUALITAS PELAYANAN PADA MARINA SRIKANDI TOUR & TRAVEL DI PADANGBAI

    Directory of Open Access Journals (Sweden)

    Made Natha Dwipayana

    2013-12-01

    Full Text Available Differences between expectation and perception of visitor about service quality of a travel agency were the background of this research which is entitled “Visitor’s Perception And Expectation of Service Quality At Marina Srikandi Tour And Travel In Padang Bai. Through this research, a thought to maintain professionalism of travel agency with qualified standards, understand different visitor expectations was a major thing that want to be achieved. Background of problem in this research was divided into two problems, such as (1 what are visitor expectation and perception about service quality at Marina Srikandi Tour and travel? (2 How is the visitor’s satisfaction about service quality which is given by Marina Srikandi Tour and travel? Based on the background of problems above, there were two aims of study in this research, they are: (1 to know visitor expectation and perception about service quality at Marina Srikandi Tour and travel, and (2 to know visitor’s satisfaction about service quality which is given by Marina Srikandi Tour and travel.

  16. A Summary of Eelgrass (Zostera marina) Reproductive Biology with an Emphasis on Seed Biology and Ecology from the Chesapeake Bay Region

    Science.gov (United States)

    2007-12-01

    features on the bottom such as animal burrows, pits, and mounds, act to shield seeds from flow and prevent their being washed out (Luckenbach and Orth...marina L. seeds. Biologia Marina Mediterranea 7:55-58. Harwell, M. C., and R. J. Orth. 1999. Eelgrass (Zostera marina L.) seed protection for field

  17. Friday Harbor Marina Expansion Study--San Juan Island, Washington: Final Detailed Project Report and Environmental Assessment.

    Science.gov (United States)

    1981-04-01

    Juan Marina Inc. Don F. Brown Self Steve F. Brown San Juan Marina Inc. Thoms Chittenden Self Alex D. Crichton Self Alan C,-mings KGMI-Bellingham Lois...Self Susan E. Risser Self Noble W. Starr Self Thomas C. Starr Self Corinne R. Towne Se"I Michael P. Vouri Bellingham Marine Industries June M. Vynne Self

  18. Burial of Zostera marina seeds in sediment inhabited by three polychaetes: laboratory and field studies

    DEFF Research Database (Denmark)

    Delefosse, Matthieu; Kristensen, Erik

    2012-01-01

    The large number of seeds produced by eelgrass, Zostera marina, provides this plant with a potential to disperse widely and colonise newareas. After dispersal, seedsmust be buried into sediment for assuring long-term survival, successful germination and safe seedling development. Seedsmay be buried......–3200 ind m −2), Arenicola marina (20–80 ind m−2), and the invasive Marenzelleria viridis (400–1600 ind m −2). The obtained results were subsequently compared with burial rates of seed mimics in experimental field plots (1m2) dominated by the respective polychaetes. High recovery of seeds in the laboratory...... (97–100%) suggested that none of these polychaetes species feed on eelgrass seeds. N. diversicolor transported seeds rapidly (marina and M. viridis buried seeds by depositing their faeces on top of the sediment...

  19. Sexual Recruitment in Zostera marina: Progress toward a Predictive Model.

    Science.gov (United States)

    Furman, Bradley T; Peterson, Bradley J

    2015-01-01

    Ecophysiological stress and physical disturbance are capable of structuring meadows through a combination of direct biomass removal and recruitment limitation; however, predicting these effects at landscape scales has rarely been successful. To model environmental influence on sexual recruitment in perennial Zostera marina, we selected a sub-tidal, light-replete study site with seasonal extremes in temperature and wave energy. During an 8-year observation period, areal coverage increased from 4.8 to 42.7%. Gains were stepwise in pattern, attributable to annual recruitment of patches followed by centrifugal growth and coalescence. Recruitment varied from 13 to 4,894 patches per year. Using a multiple linear regression approach, we examined the association between patch appearance and relative wave energy, atmospheric condition and water temperature. Two models were developed, one appropriate for the dispersal of naked seeds, and another for rafted flowers. Results indicated that both modes of sexual recruitment varied as functions of wind, temperature, rainfall and wave energy, with a regime shift in wind-wave energy corresponding to periods of rapid colonization within our site. Temporal correlations between sexual recruitment and time-lagged climatic summaries highlighted floral induction, seed bank and small patch development as periods of vulnerability. Given global losses in seagrass coverage, regions of recovery and re-colonization will become increasingly important. Lacking landscape-scale process models for seagrass recruitment, temporally explicit statistical approaches presented here could be used to forecast colonization trajectories and to provide managers with real-time estimates of future meadow performance; i.e., when to expect a good year in terms of seagrass expansion. To facilitate use as forecasting tools, we did not use statistical composites or normalized variables as our predictors. This study, therefore, represents a first step toward linking

  20. Sexual Recruitment in Zostera marina: Progress toward a Predictive Model.

    Directory of Open Access Journals (Sweden)

    Bradley T Furman

    Full Text Available Ecophysiological stress and physical disturbance are capable of structuring meadows through a combination of direct biomass removal and recruitment limitation; however, predicting these effects at landscape scales has rarely been successful. To model environmental influence on sexual recruitment in perennial Zostera marina, we selected a sub-tidal, light-replete study site with seasonal extremes in temperature and wave energy. During an 8-year observation period, areal coverage increased from 4.8 to 42.7%. Gains were stepwise in pattern, attributable to annual recruitment of patches followed by centrifugal growth and coalescence. Recruitment varied from 13 to 4,894 patches per year. Using a multiple linear regression approach, we examined the association between patch appearance and relative wave energy, atmospheric condition and water temperature. Two models were developed, one appropriate for the dispersal of naked seeds, and another for rafted flowers. Results indicated that both modes of sexual recruitment varied as functions of wind, temperature, rainfall and wave energy, with a regime shift in wind-wave energy corresponding to periods of rapid colonization within our site. Temporal correlations between sexual recruitment and time-lagged climatic summaries highlighted floral induction, seed bank and small patch development as periods of vulnerability. Given global losses in seagrass coverage, regions of recovery and re-colonization will become increasingly important. Lacking landscape-scale process models for seagrass recruitment, temporally explicit statistical approaches presented here could be used to forecast colonization trajectories and to provide managers with real-time estimates of future meadow performance; i.e., when to expect a good year in terms of seagrass expansion. To facilitate use as forecasting tools, we did not use statistical composites or normalized variables as our predictors. This study, therefore, represents a first

  1. El Instituto Hidrográfico de la Marina

    Directory of Open Access Journals (Sweden)

    Pérez Carrillo de Albornoz, Francisco J.

    2002-10-01

    Full Text Available Not available

    Se expone en este artículo la amplia labor que desarrolla el Instituto Hidrográfico de la Marina (IHM y su participación en múltiples programas y proyectos nacionales e internacionales, representando a España y manteniendo relaciones permanentes de colaboración con diversas Organizaciones, Comisiones y Comités de carácter supranacional. Tras una síntesis histórica del IHM, cuyos orígenes en el Padrón Real de 1508 le otorgan la rimacía mundial como Instituto Hidrográfico, se describen detalladamente las actividades que desarrolla el Instituto en las diferentes áreas de su competencia (Hidrografia, Geodesia y Fotogrametría, Cartografía, Navegación, Oceanografía, destacando el intenso y continuado trabajo que realizan sus buques hidrográficos y el proceso de transformación que se está llevando a cabo para implantar las modernas tecnologías en todos estos campos de actuación. Haciendo honor a la cita de que «Europa aprendió a navegar en libros españoles», se recogen también en este artículo las numerosas publicaciones que continúa editando el Instituto, como responsable que es de mantener actualizada la cartografía náutica y sus correspondientes avisos y ayudas a la navegación, para finalizar con una referencia a la labor docente que desarrolla su Escuela de Hidrografía.

  2. New species of Parapharyngodon (Nematoda: Pharyngodonidae) in Rhinella marina (Anura: Bufonidae) from Grenada, West Indies

    Science.gov (United States)

    Bursey, Charles; Drake, Michael; Cole, Rebecca; Sterner, Mauritz; Pinckney, Rhonda; Zieger, Ulrike

    2013-01-01

    Parapharyngodon grenadaensis n. sp. (Nematoda: Pharyngodonidae) from the large intestine of the cane toad, Rhinella marina, is described and illustrated. Parapharyngodon grenadaensis n. sp. is the 48th species assigned to the genus and the 16th species from the Neotropical region. It differs from other species in the genus by possessing 4 pairs of caudal papillae, an echinate anterior cloacal lip, and a blunt spicule of 67–104 μm. This is only the second report of R. marina harboring a species of Parapharyngodon.

  3. Chasing the Intangible: a Conversation on Theatre, Language, and Artistic Migrations with Irish Playwright Marina Carr

    Directory of Open Access Journals (Sweden)

    Valentina Rapetti

    2014-07-01

    Full Text Available Offally born Marina Carr is amongst the most prolific, influential and internationally renowned Irish playwrights of our times. Since her debut on the avant-garde side of the Dublin theatre scene in the late Eighties, she has had  seventeen plays professionally produced, both in and outside Ireland. Her earlier work is influenced by Samuel Beckett’s Absurdist drama, while in her most mature and recent plays she draws on both classical and Irish mythology, Greek tragedies and Shakespeare’s poetics. In this interview, Marina Carr recalls and discusses some pivotal moments of her upbringing and career; she also speaks about language, landscape, dream

  4. Fallas con actividad cuaternaria en el corredor tectonico Matagusanos-Maradona-Acequion entre los rios de La Flecha y del Agua, provincia de San Juan Faults with Quaternary activity in the Matagusanos-Maradona-Acequión tectonic depression between the ríos de la La Flecha and del Agua, San Juan province

    Directory of Open Access Journals (Sweden)

    Laura P Perucca

    2011-03-01

    Full Text Available En la depresión situada entre los ríos de La Flecha y del Agua, se encuentran evidencias de fallamiento cuaternario, entre dos sistemas estructurales con rumbo norte y vergencias opuestas, Precordillera Central con vergencia oriental y estilo de piel fina y Precordillera Oriental, con vergencia occidental y piel gruesa. Se reconocieron numerosas fallas con actividad cuaternaria a lo largo de toda la depresión: aquellas ubicadas en su porción oriental, en las proximidades del cerro La Chilca, con el mismo estilo estructural de Precordillera Oriental: fallas inversas inclinando al este con alto ángulo en la superficie. Por el contrario, las fallas localizadas en el piedemonte oriental del cordón de Las Osamentas tienen un estilo estructural consistente con Precordillera Central, inversas y con vergencia oriental. Este arreglo estructural de las fallas cuaternarias con vergencia opuesta se compara con aquellos descriptos en la depresión de Matagusanos, donde se identificó una zona triangular de tipo piel gruesa localizada cerca de su porción occidental y en el valle de zonda, situado al norte del sector analizado.Evidence of Quaternary faults between two structural systems with regional N-trending strike and opposite vergence occur at the depression located between La Flecha and del Agua rivers; the east-verging thin-skinned Central Precordillera and the west-verging, thick-skinned Eastern Precordillera. Several Quaternary faults have been recognized across the whole depression. Those located in the eastern sector near Cerro La Chilca, show the structural style of Precordillera Oriental: east-dipping reverse faults with a high angle on the surface. On the contrary, faults located at the eastern piedmont of Cordón de Las Osamentas have a structural style consistent with Precordillera Central, reverse faults and east vergence. This structural arrange of Quaternary faults with opposite vergence was compared with those described at

  5. Marina Kaljurand: hoolimata kõigest oli möödunud aasta ikkagi hea aasta / Marina Kaljurand ; interv. Igor Taro

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2008-01-01

    Ilmunud ka: Postimees : na russkom jazõke 3. jaan., lk. 5. Postimehe poolt aasta inimeseks valitud Eesti suursaadik Venemaal vastab küsimustele, mis puudutavad hinnangut 2007. aastale, pronkssõduriga seotud sündmuste üleelamist Moskvas, Venemaa poliitikute suhtumist Eestisse, Eesti-Vene suhteid. Kommenteerivad: Urmas Paet, Tiit Matsulevitš, Toomas Hendrik Ilves. Lisa: Marina Kaljurand; Pronkssõduri-sõda

  6. Marina Kaljurand: hoolimata kõigest oli möödunud aasta ikkagi hea aasta / Marina Kaljurand ; interv. Igor Taro

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2008-01-01

    Ilmunud ka: Postimees : na russkom jazõke 3. jaan., lk. 5. Postimehe poolt aasta inimeseks valitud Eesti suursaadik Venemaal vastab küsimustele, mis puudutavad hinnangut 2007. aastale, pronkssõduriga seotud sündmuste üleelamist Moskvas, Venemaa poliitikute suhtumist Eestisse, Eesti-Vene suhteid. Kommenteerivad: Urmas Paet, Tiit Matsulevitš, Toomas Hendrik Ilves. Lisa: Marina Kaljurand; Pronkssõduri-sõda

  7. Analysis of transcriptional regulation and tissue-specific expression of Avicennia marina Plasma Membrane Protein 3 suggests it contributes to Na(+) transport and homoeostasis in A. marina.

    Science.gov (United States)

    Chidambaram, Rajalakshmi; Venkataraman, Gayatri; Parida, Ajay

    2015-07-01

    Plasma membrane proteins (PMP3) play a role in cation homoeostasis. The 5' flanking sequence of stress inducible, Avicennia marina PMP3 (AmPMP3prom) was transcriptionally fused to (a) GUS or (b) GFP-AmPMP3 and analyzed in transgenic tobacco. Tissue-histochemical GUS and GFP:AmPMP3 localization are co-incident under basal and stress conditions. AmPMP3prom directed GUS activity is highest in roots. Basal transcription is conferred by a 388bp segment upstream of the translation start site. A 463bp distal enhancer in the AmPMP3prom confers enhanced expression under salinity in all tissues and also responds to increases in salinity. The effect of a central, stem-specific negative regulatory region is suppressed by the distal enhancer. The A. marina rhizosphere encounters dynamic changes in salinity at the inter-tidal interface. The complex, tissue-specific transcriptional responsiveness of AmPMP3 to salinity appears to have evolved in response to these changes. Under salinity, guard cell and phloem-specific expression of GFP:AmPMP3 is highly enhanced. Mesophyll, trichomes, bundle sheath, parenchymatous cortex and xylem parenchyma also show GFP:AmPMP3 expression. Cis-elements conferring stress, root and vascular-specific expression are enriched in the AmPMP3 promoter. Pronounced vascular-specific AmPMP3 expression suggests a role in salinity induced Na(+) transport, storage, and secretion in A. marina.

  8. Negative effects of blue mussel ( Mytilus edulis) presence in eelgrass ( Zostera marina) beds in Flensborg fjord, Denmark

    Science.gov (United States)

    Vinther, Hanne Fogh; Laursen, Jens Sund; Holmer, Marianne

    2008-03-01

    The effect of blue mussel ( Mytilus edulis) presence in eelgrass ( Zostera marina) beds was studied from June 2004 to July 2005 in Flensborg fjord, Denmark. The field experiments were conducted at two stations, one with only Z. marina (Eelgrass station) present and one where M. edulis were present in the Z. marina beds (Mixed station). Zostera marina parameters were measured (growth of leaves, shoot density, leaf length, and nutrient content) in combination with epiphyte cover and sediment parameters (sulphate reduction rates, sediment nutrient fluxes, organic content, C, N and P content) to examine possible positive and negative effects of the mussels on eelgrass performance. The fluxes of ammonium from the sediments were stimulated at all sampling dates at the Mixed station, and possibly stimulated epiphyte growth at this station. Further 15N signals in epiphytes from the Mixed station suggested that excretion products from the mussels were important nitrogen sources at this station. Sulphate reduction rates were enhanced at the Mixed station and also sediment sulphide concentrations increased under mussel influence, which may have resulted in sulphide toxicity and decreased growth of Z. marina at this station. The study indicates that for Z. marina beds in Flensborg Fjord the effects of M. edulis in seagrass beds are primarily negative, and raises the question whether this leads to negative effects on the stability and expansion of Z. marina beds.

  9. Physiological Responses of Zostera marina and Cymodocea nodosa to Light-Limitation Stress

    Science.gov (United States)

    Silva, João; Barrote, Isabel; Costa, Monya M.; Albano, Sílvia; Santos, Rui

    2013-01-01

    The effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2–3 m depth), each dominated by one species. The response of photosynthesis to light was determined with oxygen electrodes. Chlorophylls and carotenoids were determined by high-pressure liquid chromatography (HPLC). Soluble protein, carbohydrates, malondialdehyde and phenol contents were also analysed. Both species showed evident signs of photoacclimation. Their maximum photosynthetic rates were significantly reduced with shading. Ratios between specific light harvesting carotenoids and the epoxidation state of xanthophyll cycle carotenoids revealed significantly higher light harvesting efficiency of C. nodosa, a competitive advantage in a low light environment. The contents of both soluble sugars and starch were considerably lower in Z. marina plants, particularly in the rhizomes, decreasing even further with shading. The different carbohydrate energy storage strategies found between the two species clearly favour C. nodosa's resilience to light deprivation, a condition enhanced by its intrinsic arrangement of the pigment pool. On the other hand, Z. marina revealed a lower tolerance to light reduction, mostly due to a less plastic arrangement of the pigment pool and lower carbohydrate storage. Our findings indicate that Z. marina is close to a light-mediated ecophysiological threshold in Ria Formosa. PMID:24312260

  10. Variation in genetic traits of the lugworm Arenicola marina: temperature related expression of mitochondrial allozymes?

    NARCIS (Netherlands)

    Hummel, H.; Sommer, A.; Bogaards, R.H.; Portner, H.O.

    1997-01-01

    Genetic traits of the lugworm Arenicola marina were determined for 4 Atlantic populations from France to Norway and compared with a population from the sub-arctic White Sea in Russia. Seven loci were analysed using horizontal starch gel electrophoresis. A low heterozygosity (0.09 to 0.17) and a non-

  11. Monitoring of the booster biocide dichlofluanid in water and marine sediment of Greek marinas

    NARCIS (Netherlands)

    Hamwijk, C.; Schouten, A.; Foekema, E.M.; Ravensberg, J.C.; Collombon, M.T.; Schmidt, K.; Kugler, M.

    2005-01-01

    Dichlofluanid (N-dichlorofluoromethylthio-N′-dimethyl-N- phenylsulphamide) is used as booster biocide in antifouling paints. The occurrence of dichlofluanid and its metabolite DMSA (N′-dimethyl-N-phenyl- sulphamide) was monitored in seawater and marine sediment from three Greek marinas. Seawater and

  12. Contrasting oxygen dynamics in the freshwater isoetid Lobelia dortmanna and the marine seagrass Zostera marina

    DEFF Research Database (Denmark)

    Sand-Jensen, Kaj; Pedersen, Ole; Binzer, Thomas

    2005-01-01

    . Also, O2 accumulated in the aerenchyma can theoretically support dark respiration for a few hours in L. dortmanna but for only a few minutes in Z. marina. CONCLUSIONS: The build-up of O2 in the pore-water of L. dortmanna sediments during the day as a result of high release of photosynthetic O2 from...

  13. 78 FR 45061 - Safety Zone; Sister Bay Marina Fest Fireworks and Ski Show, Sister Bay, WI

    Science.gov (United States)

    2013-07-26

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Sister Bay Marina Fest Fireworks and Ski... intended to restrict vessels from a portion of Sister Bay due to a fireworks display and ski show. This... with the fireworks display and ski show in Sister Bay on August 31, 2013. DATES: This rule is...

  14. ESTRUCTURA DE COMUNIDADES BACTERIANAS ASOCIADAS A MACROALGAS MARINAS: EFECTO DEL COBRE COMO FACTOR MODULADOR.

    OpenAIRE

    HENGST LOPEZ, MARTHA BRIGITTE

    2008-01-01

    Las bacterias se asocian a las algas en distintas etapas de su desarrollo y constituyen importantes reguladores de procesos fisiológicos de macroalgas marinas tales como la facilitación del asentamiento y germinación de las esporas, y el desarrollo de la 173p.

  15. Phylogeographic differentiation versus transcriptomic adaptation to warm temperatures in Zostera marina, a globally important seagrass

    NARCIS (Netherlands)

    Jueterbock, Alexander; Franssen, S. U.; Bergmann, N.; Gu, J.; Coyer, J. A.; Reusch, T. B. H.; Bornberg-Bauer, E.; Olsen, J. L.

    2016-01-01

    Populations distributed across a broad thermal cline are instrumental in addressing adaptation to increasing temperatures under global warming. Using a space-for-time substitution design, we tested for parallel adaptation to warm temperatures along two independent thermal clines in Zostera marina,

  16. Sulfide Intrusion and Detoxification in the Seagrass Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Holmer, Marianne

    2015-01-01

    with scanning electron microscopy coupled to energy dispersive X-ray spectroscopy, chromatographic and spectrophotometric methods, and stable isotope tracing coupled with a mass balance of sulfur compounds. We found that Z. marina detoxified gaseous sediment-derived sulfide through incorporation and that most...

  17. Een studie van de variabiliteit van Spergularia media en Spergularia marina van Nederland

    NARCIS (Netherlands)

    Sterk, Adrianus Anne

    1968-01-01

    In the Netherlands the distinction of the species Spergularia media (L.) C. Presl (Syn.: S.marginata (DC.) Kittel) and Spergularia marina (L.) Grisebach (Syn.: S.salina J. et C. Presl) is not always easy. These taxonomical difficulties gave cause to investigate the variability of these two halophilo

  18. Mechanisms of seed dormancy in an annual population of Zostera marina (eelgrass) from the Netherlands)

    NARCIS (Netherlands)

    Harrison, P.G.

    1991-01-01

    Mechanisms of dormancy of seeds from an annual population of the seagrass Zostera marina L. (eelgrass) in the SW Netherlands were investigated in the laboratory. Both physiological dormancy (a requirement for reduced salinity for germination) and physical dormancy (imposed by the seed coat) existed

  19. The genome of the seagrass Zostera marina reveals angiosperm adaptation to the sea

    NARCIS (Netherlands)

    Olsen, Jeanine; Rouzé, Pierre; Verhelst, Bram; Lin, Yao-Cheng; Bayer, Till; Collen, Jonas; Dattolo, Emanuela; De Paoli, Emanuele; Dittami, Simon; Maumus, Florian; Michel, Gurvan; Kersting, Anna; Lauritano, Chiara; Lohaus, Rolf; Töpel, Mats; Tonon, Thierry; Vanneste, Kevin; Amirebrahimi, Mojgan; Brakel, Janina; Boström, Christoffer; Chovatia, Mansi; Grimwood, Jane; Jenkins, Jerry W; Jueterbock, Alexander; Mraz, Amy; Stam, Wytze T; Tice, Hope; Bornberg-Bauer, Erich; Green, Pamela J; Pearson, Gareth A; Procaccini, Gabriele; Duarte, Carlos M; Schmutz, Jeremy; Reusch, Thorsten B H; Van de Peer, Yves

    2016-01-01

    Seagrasses colonized the sea on at least three independent occasions to form the basis of one of the most productive and widespread coastal ecosystems on the planet. Here we report the genome of Zostera marina (L.), the first, to our knowledge, marine angiosperm to be fully sequenced. This reveals u

  20. The influence of a marina canal system on the ecology of the ...

    African Journals Online (AJOL)

    marina and in the main estuary showed a very similar com- position, but ... plankton, benthic macro-invertebrate fauna and fish and that it does not .... The time was measured in .... The results show that the temperature, salinity and dissolved ...

  1. Size and estimated age of genets in eelgrass, Zostera marina, assessed with microsatellite markers

    NARCIS (Netherlands)

    Reusch, TBH; Stam, WT; Olsen, JL

    1999-01-01

    We examined the spatial distribution of genotypes in a perennial population of eelgrass, Zostera marina L., at two spatial scales. We mapped and sampled 80 ramets in a subtidal area of 20 x 80 m, and an additional 15 ramets in two 1-m(2) sub-quadrats. Ramets were genotyped for seven polymorphic micr

  2. Temporal and spatial dynamics of ephemeral drift-algae in eelgrass, Zostera marina, beds

    DEFF Research Database (Denmark)

    Rasmussen, Jonas; Pedersen, Morten Foldager; Olesen, Birgit

    2013-01-01

    Aggregations of unattached, filamentous macroalgae showed high temporal and spatial dynamics in two shallow and relatively sheltered eelgrass (Zostera marina) beds in Aarhus Bay and Isefjord, Denmark. The changes in algal abundance were followed in permanent plots at 1-3 days intervals during three...

  3. Comparative-Study on Populations of Zostera-Marina L (Eelgrass) - Experimental Germination and Growth

    NARCIS (Netherlands)

    Van Lent, F.; Verschuure, J.M.

    1995-01-01

    Seeds of both perennial and (semi-)annual populations of Zostera marina L. originating from different habitats in the southwestern Netherlands and Roscoff (Brittany, France) were germinated and grown under identical circumstances to identify possible genotypically based differences in their populati

  4. A Low-Cost Planting Technique for Eelgrass (Zostera marina L.).

    Science.gov (United States)

    1982-12-01

    marina and Halodule wrightii for the Stabilization of Sub- tidal Dredged Material," Annual Report, Beaufort Laboratory, Beaufort, N.C., Oct. 1981. FONSECA... Halodule wrightii and the Physical and Chemical Properties of Sediments in a Coastal Plain Estuary Near Beaufort, North Carolina," M.S. Thesis

  5. Monitoring of the booster biocide dichlofluanid in water and marine sediment of Greek marinas

    NARCIS (Netherlands)

    Hamwijk, C.; Schouten, A.; Foekema, E.M.; Ravensberg, J.C.; Collombon, M.T.; Schmidt, K.; Kugler, M.

    2005-01-01

    Dichlofluanid (N-dichlorofluoromethylthio-N′-dimethyl-N- phenylsulphamide) is used as booster biocide in antifouling paints. The occurrence of dichlofluanid and its metabolite DMSA (N′-dimethyl-N-phenyl- sulphamide) was monitored in seawater and marine sediment from three Greek marinas. Seawater and

  6. Effects of salinity and water temperature on the ecological performance of Zostera marina

    DEFF Research Database (Denmark)

    Nejrup, Lars Brammer; Pedersen, Morten Foldager

    2008-01-01

    We tested the effects of salinity and water temperature on the ecological performance of eelgrass (Zostera marina L.) in culture-experiments to identify levels that could potentially limit survival and growth and, thus, the spatial distribution of eelgrass in temperate estuaries. The experiments ...

  7. Biodynamic modelling and the prediction of accumulated trace metal concentrations in the polychaete Arenicola marina

    Energy Technology Data Exchange (ETDEWEB)

    Casado-Martinez, M. Carmen, E-mail: c.casado-martinez@nhm.ac.u [Department of Zoology, The Natural History Museum, Cromwell Rd, London SW7 5BD (United Kingdom); Smith, Brian D. [Department of Zoology, The Natural History Museum, Cromwell Rd, London SW7 5BD (United Kingdom); DelValls, T. Angel [Unesco UNITWIN Wicop Chair, Department of Physical-Chemistry, University of Cadiz, Poligono Industrial Rio San Pedro s/n, C.P. 11510 Puerto Real (Cadiz) (Spain); Luoma, Samuel N. [John Muir Institute of the Environment, University of California at Davis, Davis, CA 95616 (United States); Rainbow, Philip S. [Department of Zoology, The Natural History Museum, Cromwell Rd, London SW7 5BD (United Kingdom)

    2009-10-15

    The use of biodynamic models to understand metal uptake directly from sediments by deposit-feeding organisms still represents a special challenge. In this study, accumulated concentrations of Cd, Zn and Ag predicted by biodynamic modelling in the lugworm Arenicola marina have been compared to measured concentrations in field populations in several UK estuaries. The biodynamic model predicted accumulated field Cd concentrations remarkably accurately, and predicted bioaccumulated Ag concentrations were in the range of those measured in lugworms collected from the field. For Zn the model showed less but still good comparability, accurately predicting Zn bioaccumulation in A. marina at high sediment concentrations but underestimating accumulated Zn in the worms from sites with low and intermediate levels of Zn sediment contamination. Therefore, it appears that the physiological parameters experimentally derived for A. marina are applicable to the conditions encountered in these environments and that the assumptions made in the model are plausible. - Biodynamic modelling predicts accumulated field concentrations of Ag, Cd and Zn in the deposit-feeding polychaete Arenicola marina.

  8. The cane or marine toad, Rhinella marina (Anura, Bufonidae): two genetically and morphologically distinct species.

    Science.gov (United States)

    Acevedo, Aldemar A; Lampo, Margarita; Cipriani, Roberto

    2016-04-18

    Rhinella marina is a Neotropical toad that has been introduced widely worldwide. Its toxic effects to frog-eating predators threaten the native and domestic fauna of some regions where it has been introduced. Despite previous studies suggesting two genetically distinct cryptic species within R. marina, one east and one west of the Andes, its taxonomic status remained unresolved due to the absence of morphological complementary evidence. For the first time, data from two mitochondrial genes (ND3 and CR) and 23 morphometric landmarks are combined to evaluate the taxonomic status of this species. Our results support the hypothesis of two separate evolutionary lineages within R. marina and demonstrate that these lineages have significantly diverged in skull shape. We identified two distinct morphotypes, one eastern and one Andean western, with no overlapping morphospaces. The geographic pattern of genetic variation was consistent with a stable structured population with no evidence of recent demographic or geographic expansions. The concordance between the observed geographic patterns in morphometric and genic traits calls for the recognition of two species under R. marina name.

  9. Phylogeographic differentiation versus transcriptomic adaptation to warm temperatures in Zostera marina, a globally important seagrass

    NARCIS (Netherlands)

    Jueterbock, Alexander; Franssen, S. U.; Bergmann, N.; Gu, J.; Coyer, J. A.; Reusch, T. B. H.; Bornberg-Bauer, E.; Olsen, J. L.

    2016-01-01

    Populations distributed across a broad thermal cline are instrumental in addressing adaptation to increasing temperatures under global warming. Using a space-for-time substitution design, we tested for parallel adaptation to warm temperatures along two independent thermal clines in Zostera marina, t

  10. Atlantic Cod (Gadus morhua benefits from the availability of seagrass (Zostera marina nursery habitat

    Directory of Open Access Journals (Sweden)

    Richard J. Lilley

    2014-12-01

    Full Text Available The Atlantic cod (Gadus morhua is a species of significant economic and historic importance but infamous for its decline. Apart from overfishing, the causes of this decline and its subsequent lack of recovery remain largely unresolved. Indeed, the degree to which specific habitats are important for this species remains unquantified at the scale of North Atlantic. Here, the literature on the role of eelgrass meadows (Zostera marina as valuable nursery habitat for the Atlantic cod is reviewed and synthesized. Evidence is presented on relative densities of Atlantic cod in shallow water environments and in eelgrass meadows in comparison to alternative habitats. In addition, evidence pertaining to the ’viability gains’ attributed to the use of eelgrass meadows as nursery habitat (growth and survival by juvenile Atlantic cod is analyzed. Although juvenile Atlantic cod use of Z. marina is found to be facultative, when possible, available literatures indicates that they may select Z. marina as a nursery habitat where they are found in high density (average of at least 246 ha−1. From their use of Z. marina habitat the juvenile Atlantic cod receives viability benefits from it, improving their chances of reaching maturation. This paper provides strong evidence that eelgrass meadows are of significant importance to contributing to Atlantic cod stocks.

  11. Transcriptome sequencing and analysis of leaf tissue of Avicennia marina using the Illumina platform.

    Directory of Open Access Journals (Sweden)

    Jianzi Huang

    Full Text Available Avicennia marina is a widely distributed mangrove species that thrives in high-salinity habitats. It plays a significant role in supporting coastal ecosystem and holds unique potential for studying molecular mechanisms underlying ecological adaptation. Despite and sometimes because of its numerous merits, this species is facing increasing pressure of exploitation and deforestation. Both study on adaptation mechanisms and conservation efforts necessitate more genomic resources for A. marina. In this study, we used Illumina sequencing of an A. marina foliar cDNA library to generate a transcriptome dataset for gene and marker discovery. We obtained 40 million high-quality reads and assembled them into 91,125 unigenes with a mean length of 463 bp. These unigenes covered most of the publicly available A. marina Sanger ESTs and greatly extended the repertoire of transcripts for this species. A total of 54,497 and 32,637 unigenes were annotated based on homology to sequences in the NCBI non-redundant and the Swiss-prot protein databases, respectively. Both Gene Ontology (GO analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG pathway analysis revealed some transcriptomic signatures of stress adaptation for this halophytic species. We also detected an extraordinary amount of transcripts derived from fungal endophytes and demonstrated the utility of transcriptome sequencing in surveying endophyte diversity without isolating them out of plant tissues. Additionally, we identified 3,423 candidate simple sequence repeats (SSRs from 3,141 unigenes with a density of one SSR locus every 8.25 kb sequence. Our transcriptomic data will provide valuable resources for ecological, genetic and evolutionary studies in A. marina.

  12. Chapter F. The Loma Prieta, California, Earthquake of October 17, 1989 - Marina District

    Science.gov (United States)

    O'Rourke, Thomas D.

    1992-01-01

    During the earthquake, a total land area of about 4,300 km2 was shaken with seismic intensities that can cause significant damage to structures. The area of the Marina District of San Francisco is only 4.0 km2--less than 0.1 percent of the area most strongly affected by the earthquake--but its significance with respect to engineering, seismology, and planning far outstrips its proportion of shaken terrain and makes it a centerpiece for lessons learned from the earthquake. The Marina District provides perhaps the most comprehensive case history of seismic effects at a specific site developed for any earthquake. The reports assembled in this chapter, which provide an account of these seismic effects, constitute a unique collection of studies on site, as well as infrastructure and societal, response that cover virtually all aspects of the earthquake, ranging from incoming ground waves to the outgoing airwaves used for emergency communication. The Marina District encompasses the area bounded by San Francisco Bay on the north, the Presidio on the west, and Lombard Street and Van Ness Avenue on the south and east, respectively. Nearly all of the earthquake damage in the Marina District, however, occurred within a considerably smaller area of about 0.75 km2, bounded by San Francisco Bay and Baker, Chestnut, and Buchanan Streets. At least five major aspects of earthquake response in the Marina District are covered by the reports in this chapter: (1) dynamic site response, (2) soil liquefaction, (3) lifeline performance, (4) building performance, and (5) emergency services.

  13. Influence of model selection on the predicted distribution of the seagrass Zostera marina

    Science.gov (United States)

    Downie, Anna-Leena; von Numers, Mikael; Boström, Christoffer

    2013-04-01

    There is an increasing need to model the distribution of species and habitats for effective conservation planning, but there is a paucity of models for the marine environment. We used presence (131) and absence (219) records of the marine angiosperm Zostera marina L. from the archipelago of SW Finland, northern Baltic Sea, to model its distribution in a 5400 km2 area. We used depth, slope, turbidity, wave exposure and distance to sandy shores as environmental predictors, and compared a presence-absence method: generalised additive model (GAM), with a presence only method: maximum entropy (Maxent). Models were validated using semi-independent data sets. Both models performed well and described the niche of Z. marina fairly consistently, although there were differences in the way the models weighted the environmental variables, and consequently the spatial predictions differed somewhat. A notable outcome from the process was that with relatively equal model performance, the area actually predicted in geographical space can vary by twofold. The area predicted as suitable for Z. marina by the ensemble was almost half of that predicted by the GAM model by itself. The ensemble of model predictions increased the model predictive capability marginally and clearly shifted the model towards a more conservative prediction, increasing specificity, but at the same time sacrificing sensitivity. The environmental predictors selected into the final models described the potential distribution of Z. marina well and showed that in the northern Baltic the species occupies a narrow niche, typically thriving in shallow and moderately exposed to exposed locations near sandy shores. We conclude that a prediction based on a combination of model results provides a more realistic estimate of the core area suitable for Z. marina and should be the modelling approach implemented in conservation planning and management.

  14. Pathways of trace metal uptake in the lugworm Arenicola marina

    Energy Technology Data Exchange (ETDEWEB)

    Casado-Martinez, M.C. [Department of Zoology, Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom)], E-mail: c.casado-martinez@nhm.ac.uk; Smith, B.D. [Department of Zoology, Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom); Valls, T.A. del [Unesco UNITWIN Wicop Chair, Department of Physical-Chemistry, University of Cadiz, Poligono Industrial Rio San Pedro s/n, C.P. 11510 Puerto Real, Cadiz (Spain); Rainbow, P.S. [Department of Zoology, Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom)

    2009-04-02

    Radiotracer techniques were used to determine the rates of trace metal (Ag, Cd and Zn) uptake and elimination (33 psu, 10 deg. C) from water and sediment by the deposit-feeding polychaete Arenicola marina, proposed as a test species for estuarine-marine sediments in whole-sediment toxicity tests. Metal uptake rates from solution increase with increasing dissolved metal concentrations, with uptake rate constants ({+-} SE) (l g{sup -1} d{sup -1}) of 1.21 {+-} 0.11 (Ag), 0.026 {+-} 0.002 (Zn) and 0.012 {+-} 0.001 (Cd). Assimilation efficiencies from ingested sediments were measured using a pulse-chase radiotracer feeding technique in two different lugworm populations, one from a commercial supplier (Blyth, Northumberland, UK) and the other a field-collected population from the outer Thames estuary (UK). Assimilation efficiencies ranged from 2 to 20% for Zn, 1 to 6% for Cd and 1 to 9% for Ag for the Northumberland worms, and from 3 to 22% for Zn, 6 to 70% for Cd and 2 to 15% for Ag in the case of the Thames population. Elimination of accumulated metals followed a two-compartment model, with similar efflux rate constants for Zn and Ag and lower rates of elimination of Cd from the slow pool. Efflux rate constants ({+-} SE) of Zn and Ag accumulated from the dissolved phase were 0.037 {+-} 0.002 and 0.033 {+-} 0.006 d{sup -1} whereas Cd was eliminated with an efflux rate constant one order of magnitude lower (0.003 {+-} 0.002 d{sup -1}). When metals were accumulated from ingested sediments, the efflux rate constants for the slow-exchanging compartment were of the same order of magnitude for the three metals, and of the same order of magnitude as those derived after the dissolved exposure for Zn and Ag (0.042 {+-} 0.004 and 0.056 {+-} 0.012 d{sup -1} for Zn and 0.044 {+-} 0.012 and 0.069 {+-} 0.016 d{sup -1} for Ag for the Northumberland and Thames populations, respectively). Cd accumulated from ingested sediments was eliminated with a rate constant not different from the

  15. A comparative evaluation of biological activities and bioactive compounds of the seagrasses Zostera marina and Zostera noltei from southern Portugal.

    Science.gov (United States)

    Custódio, Luísa; Laukaityte, Simona; Engelen, Aschwin H; Rodrigues, Maria João; Pereira, Hugo; Vizetto-Duarte, Catarina; Barreira, Luísa; Rodríguez, Hortensia; Alberício, Fernando; Varela, João

    2016-01-01

    This work assessed the antioxidant potential, acetylcholinesterase (AChE) inhibition and the in vitro cytotoxic activity of extracts of the seagrasses Zostera marina and Zostera noltei collected from southern Portugal. The total phenolic contents (TPCs), the rosmarinic acid (RA) concentration (HPLC/DAD) and the fatty acid (FA) profile (GC/MS) are also described. Z. marina had the highest TPC, radical scavenging activity against DPPH radicals and copper chelating activity. Z. noltei had metal chelation capacity to copper and iron ions. None of the species was able to inhibit AChE. Both seagrasses had high levels of polyunsaturated FAs. Z. marina significantly and selectively reduced the viability of tumorous neuronal cells. Z. noltei was highly toxic for the three cell lines tested and was selective against hepatocarcinoma cells at the concentration of 100 μg/mL. RA was the main compound identified in Z. marina, but not in Z. noltei.

  16. Determining bathymetric distributions of the eelgrass Zostera marina L. in three turbid estuaries of the eastern North Pacific coast

    Science.gov (United States)

    Improved methods for determining bathymetric distributions of dominant intertidal plants throughout their estuarine range are needed. Zostera marina is a seagrass native to estuaries of the northeastern Pacific and many other sectors of the world ocean. The technique described ...

  17. Nymphicidal and Ovipositional Efficacy of Seaweed Sargassum tenerrimum (J. Agardh against Dysdercus cingulatus (Fab. (Pyrrhocoridae Eficacia Ninficida y Ovicida de una Alga Marina Sargassum tenerrimum (J. Agardh contra Dysdercus cingulatus (Fab. (Pyrrhocoridae

    Directory of Open Access Journals (Sweden)

    Kitherian Sahayaraj

    2012-03-01

    Full Text Available We investigated the role of a brown seaweed alga, Sargassum tenerrimum (J. Agardh, against Dysdercus cingulatus (Fab., which is an economically important cotton pest in many parts of Asia. Sargassum tenerrimum has been used as a source of fertilizers and drugs, but there is no information available in the literature about its use in ecofriendly pest management. The impact of benzene (BN, chloroform (CH, and a mixture of benzene and chloroform (BNCH extracts, as well as two chromatographic fractions of BNCH (FR1 and FR2 were investigated for their insecticidal and ovipositional properties against D. cingulatus. The BE extract showed the best insecticidal activity (LC50 = 0.009%, higher than BNCH (LC50 = 0.021% and CH extracts (LC50 = 0.2481%, and all the extracts reduced the total nymphal developmental period of the pest in a dose-dependent way. Adult longevity of both males and females was reduced by the CH and BE extracts. The CH extract reduced D. cingulatus oviposition, preoviposition, and post-oviposition periods, as well as fecundity. Females emerging from the BE category could not lay eggs. All the extracts significantly reduced both total body protein and genomic DNA content. The BECH fractions, FR1 and FR2, also exhibited nymphicidal activity against the pest. However, these fractions did not significantly alter the nymphal developmental period. Results indicate that these seaweed extracts can be used as biopesticides for pest management.Investigamos el rol de una alga marina café, Sargassum tenerrimum (J. Agardh, contra Dysdercus cingulatus (Fab., una plaga económicamente importante del algodón en muchas partes de Asia. Sargassum tenerrimum ha sido usada como fuente de fertilizantes y drogas, pero en la literatura no hay información disponible sobre su uso en manejo de plagas ecoamigable. Se investigó el impacto de extractos con benceno (BN, cloroformo (CH, y una mezcla de ambos (BNCH así como dos fracciones cromatográficas de

  18. ASOCIACIONES ENTRE AVES MARINAS Y SOTALIA GUIANENSIS EN EL SUR DEL GOLFO DE VENEZUELA

    Directory of Open Access Journals (Sweden)

    NÍNIVE ESPINOZA-RODRÍGUEZ

    2015-01-01

    Full Text Available Las asociaciones entre aves marinas y mamíferos marinos es un evento común en todos los mares y océanos del mundo. Muchos autores han denominado estas asociaciones como relaciones comensalistas, oportunistas o parasitarias, según el efecto que dicha interacción resulte sobre una o ambas especies relacionadas. Con la finalidad de describir la existencia de agrupaciones entre Sotalia guianensis y aves marinas en la porción sur del Golfo de Venezuela, desde junio 2011 a junio 2012 se realizaron observaciones en plataformas móviles de grupos de este cetáceo y aves marinas, utilizando el protocolo "group-follow" bajo la metodología de "Ad libitum sampling". Todos los avistamientos fueron georreferenciados, realizándose anotaciones de la ocurrencia o no-asociación con aves marinas, de igual forma, se registró la especie y el número de aves presentes al momento de la interacción. Se realizaron 721 avistamientos, de los cuales en 197 eventos se registró asociación entre aves marinas y Sotalia guianensis. Las especies de aves marinas residentes que presentaron mayor frecuencia en eventos de asociación con S. guianensis fueron: Fregata magnificens (49%; n=98, Phalacrocorax brasilianus (29,5%; n=59 y Pelecanus occidentalis (22,5%; n=45; siendo Thalasseus maxima (71%; n=142 la única especie migratoria. Durante las observaciones realizadas en el período de muestreo se notó la presencia de una especie de golondrina (Riparia riparia en un solo evento de agrupación con Sotalia guianensis. Dichas asociaciones aves-delfines, sólo fueron observadas cuando notables congregaciones de peces fueron registrados, donde el o los grupos de delfines realizaban alguna actividad con grandes movimientos de agua, lo que pudiese permitir a las aves realizar un menor gasto energético en la ubicación y la captura de la presa.

  19. ANALISIS AKTIVITAS ANTIBAKTERI EKSTRAK DAUN MANGROVE Avicennia marina DARI KABUPATEN TRENGGALEK DAN KABUPATEN PASURUAN TERHADAP PERTUMBUHAN Staphylococcus aureus DAN Vibrio alginolyticus

    Directory of Open Access Journals (Sweden)

    Ridha Handriany Danada

    2014-04-01

    Full Text Available Avicennia marina mampu beradaptasi pada habitat pasang-surut dan memiliki toleransi salinitas bervariasi. Bentuk adaptasi tersebut berpotensi mempengaruhi komposisi senyawa metabolit sekunder A. marina. Penelitian ini bertujuan mengetahui komposisi senyawa bioaktif yang terdapat pada ekstrak daun A. marina dari Kabupaten Trenggalek dan Kabupaten Pasuruan dan mengetahui aktivitas antibakteri ekstrak A. marina dalam menghambat pertumbuhan bakteri Staphylococcus aureus dan Vibrio alginolyticus. Hasil uji fitokimia menunjukkan kandungan alkaloid, flavonoid, dan saponin pada ekstrak A. marina dari kedua lokasi. Namun, kandungan senyawa Terpenoid dan Tanin hanya ditemukan pada stasiun dengan kondisi tertentu. Hasil uji aktivitas antibakteri ekstrak daun A. marina dari Kabupaten Trenggalek dan Kabupaten Pasuruan terhadap S. aureus menunjukkan hasil rata-rata diameter zona bening sebesar 4,43 – 5,79 mm dan terhadap V. alginolyticus sebesar 4,25 – 5,48 mm. Hal ini menunjukkan bahwa ekstrak daun mangrove A. marina mampu menghambat pertumbuhan bakteri S. aureus dan V. alginolyticus. Perbedaan habitat tidak memberikan pengaruh yang signifikan terhadap kemampuan daya hambat, tetapi pada komposisi senyawa bioaktif.Kata Kunci: aktivitas antibakteri, senyawa metabolit sekunder, Kabupaten Trenggalek, Kabupaten  Pasuruan, Avicennia marinaANTIBACTERIAL ACTIVITY ANALYSIS OF LEAF EXTRACT FROM DISTRICT MANGROVE Avicennia marina PASURUAN TRENGGALEK AND ON THE GROWTH AND Staphylococcus aureus, Vibrio alginolyticusABSTRACTAvicennia marina capable of adapting to the habitat in tidal and have varying salinity tolerance. Adaptation has the potential to affect the composition of secondary metabolites, A. marina. This study aims to determine the composition of bioactive compounds contained in extracts of leaves of A. marina of Trenggalek and Pasuruan and determine the antibacterial activity of the extracts of A. marina in inhibiting the growth of Staphylococcus aureus

  20. The effect of wind direction and building surroundings on a marina bay in the Black Sea

    Science.gov (United States)

    Katona, Cosmin; Safta, Carmen Anca

    2017-01-01

    The wind effect has usually a major importance in the marina bay. These environmental sites are an interplay between tourist and commercial activities, requiring a high-detailed and definition studies of the dynamic fluid in the harbor. Computational Fluid Dynamics (CFD) has been used elaborately in urban surroundings research. However, most CFD studies were performed for harbors for only a confined number of wind directions and/or without considering the building surroundings effects. This paper presents the results of different simulations based on various wind flows and the CFD simulation of coupled urban wind flow and general wind directions upon a semi-closed area. Thus the importance of wind effects on the evaluation of the marina bay will be pointed out to achieve a safe and secure mooring at the berth and eventually a good potential of renewable energy for an impending green harbor.

  1. Innovación docente en biología marina

    OpenAIRE

    Guerra-García, José Manuel; Espinosa, Free; García-Gómez, J. Carlos

    2011-01-01

    El inicio del grado de Biología en la Universidad de Sevilla restringe a 4 años la duración de la licenciatura y supone la desaparición de la asignatura optativa “Biología Marina”. Por tanto, el futuro del mantenimiento de la línea docente en Biología Marina en la Universidad de Sevilla, dependerá exclusivamente del futuro desarrollo de un máster. Por ello, en la asignatura de Biología Marina (aún vigente los próximos dos cursos) se están implementando, a modo de ensayo previo ...

  2. Nematode response to metal, PAHs and organic enrichment in tourist marinas of the Mediterranean Sea.

    Science.gov (United States)

    Moreno, M; Albertelli, G; Fabiano, M

    2009-08-01

    The structure of nematode assemblages was investigated in the sediments of two different tourist marinas in the Mediterranean Sea and related to pollution variables. Nematode densities and generic compositions were determined, as were concentrations of heavy metals, PAHs and organic matter. Results showed different assemblages at the two marinas, with a dominance of the genera Paralongicyatholaimus and Daptonema. Significant correlations between nematodes and concentrations of environmental contaminants were found. In particular, Paralongicyatholaimus showed a significant negative correlation with Cu concentrations and was almost absent at the stations where higher Cu concentrations were found. The presence of sensitive/tolerant nematode genera represents a promising tool to identify areas subjected to a higher level of disturbance and to define the correct environmental management strategy for harbors.

  3. Rhizosphere O2 dynamics in young Zostera marina and Ruppia maritima

    DEFF Research Database (Denmark)

    Jovanovic, Zeljko; Pedersen, Mia Østergaard; Larsen, Morten

    2015-01-01

    Zostera marina and Ruppia maritima often share the same habitat, but R. maritima appears more resistant to environmental stress. We investigated the impact of light intensity and water column O2 concentrations on radial oxygen loss (ROL), in young specimens of Z. marina and R. maritima. Planar op....... The ability of R. maritima to maintain higher ROL than Z. marina could be an important feature defining its potential for colonizing and maintaining growth in eutrophic sediments....

  4. Molluscs as bioindicators of the regression of a Zostera marina bed in southern Spain

    OpenAIRE

    J. Urra; Narros, J. (Jessica); Mateo-Ramírez, A. (Angel); Marina-Ureña, P. (Pablo); M. ANTIT; J.L. RUEDA; Salas, C.

    2016-01-01

    Seagrass beds are experiencing a sharp decline worldwide and, unfortunately, a continued decrease is expected, mainly due to anthropogenic influence, with negative repercussions for coastal biodiversity. One of these declining seagrasses is Zostera marina L. which is the most widespread in the northern hemisphere (North America, Europe and Asia). One of the most recent observed cases of eelgrass decline occurred in the Special Area of Conservation “Acantilados de Maro - Cerro Gordo” (southern...

  5. Rhizosphere microbiome metagenomics of gray mangroves (Avicennia marina) in the Red Sea.

    Science.gov (United States)

    Alzubaidy, Hanin; Essack, Magbubah; Malas, Tareq B; Bokhari, Ameerah; Motwalli, Olaa; Kamanu, Frederick Kinyua; Jamhor, Suhaiza Ahmad; Mokhtar, Noor Azlin; Antunes, André; Simões, Marta Filipa; Alam, Intikhab; Bougouffa, Salim; Lafi, Feras F; Bajic, Vladimir B; Archer, John A C

    2016-02-01

    Mangroves are unique, and endangered, coastal ecosystems that play a vital role in the tropical and subtropical environments. A comprehensive description of the microbial communities in these ecosystems is currently lacking, and additional studies are required to have a complete understanding of the functioning and resilience of mangroves worldwide. In this work, we carried out a metagenomic study by comparing the microbial community of mangrove sediment with the rhizosphere microbiome of Avicennia marina, in northern Red Sea mangroves, along the coast of Saudi Arabia. Our results revealed that rhizosphere samples presented similar profiles at the taxonomic and functional levels and differentiated from the microbiome of bulk soil controls. Overall, samples showed predominance by Proteobacteria, Bacteroidetes and Firmicutes, with high abundance of sulfate reducers and methanogens, although specific groups were selectively enriched in the rhizosphere. Functional analysis showed significant enrichment in 'metabolism of aromatic compounds', 'mobile genetic elements', 'potassium metabolism' and 'pathways that utilize osmolytes' in the rhizosphere microbiomes. To our knowledge, this is the first metagenomic study on the microbiome of mangroves in the Red Sea, and the first application of unbiased 454-pyrosequencing to study the rhizosphere microbiome associated with A. marina. Our results provide the first insights into the range of functions and microbial diversity in the rhizosphere and soil sediments of gray mangrove (A. marina) in the Red Sea.

  6. Rhizosphere microbiome metagenomics of gray mangroves (Avicennia marina) in the Red Sea

    KAUST Repository

    Alzubaidy, Hanin S.

    2015-11-10

    Mangroves are unique, and endangered, coastal ecosystems that play a vital role in the tropical and subtropical environments. A comprehensive description of the microbial communities in these ecosystems is currently lacking, and additional studies are required to have a complete understanding of the functioning and resilience of mangroves worldwide. In this work, we carried out a metagenomic study by comparing the microbial community of mangrove sediment with the rhizosphere microbiome of Avicennia marina, in northern Red Sea mangroves, along the coast of Saudi Arabia. Our results revealed that rhizosphere samples presented similar profiles at the taxonomic and functional levels and differentiated from the microbiome of bulk soil controls. Overall, samples showed predominance by Proteobacteria, Bacteroidetes and Firmicutes, with high abundance of sulfate reducers and methanogens, although specific groups were selectively enriched in the rhizosphere. Functional analysis showed significant enrichment in ‘metabolism of aromatic compounds’, ‘mobile genetic elements’, ‘potassium metabolism’ and ‘pathways that utilize osmolytes’ in the rhizosphere microbiomes. To our knowledge, this is the first metagenomic study on the microbiome of mangroves in the Red Sea, and the first application of unbiased 454-pyrosequencing to study the rhizosphere microbiome associated with A. marina. Our results provide the first insights into the range of functions and microbial diversity in the rhizosphere and soil sediments of gray mangrove (A. marina) in the Red Sea.

  7. Characterisation of esterases as potential biomarkers of pesticide exposure in the lugworm Arenicola marina (Annelida: Polychaeta)

    Energy Technology Data Exchange (ETDEWEB)

    Hannam, Marie L. [Ecotoxicology and Stress Biology Research Centre, School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA (United Kingdom)], E-mail: marie.hannam@plymouth.ac.uk; Hagger, Josephine A.; Jones, Malcolm B.; Galloway, Tamara S. [Ecotoxicology and Stress Biology Research Centre, School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA (United Kingdom)

    2008-03-15

    Here, we identify and characterise cholinesterase (ChE) and carboxylesterase (CbE) activities in the body tissues of the sediment dwelling worm Arenicola marina. Exposure to the organophosphorus pesticide azamethiphos yielded an in vitro IC{sub 50} of 5 {mu}g l{sup -1} for propionylcholinesterase (PChE). PChE was significantly inhibited in vivo after a 10 day exposure to 100 {mu}g l{sup -1} azamethiphos, equivalent to the recommended aquatic application rate (ANOVA; F = 2.75, P = 0.033). To determine sensitivity to environmental conditions, A. marina were exposed for 10 days to field collected sediments. PChE activity was significantly lower in worms exposed to sediments from an estuary classified to be at high risk from point source pollution by the UK Environment Agency (ANOVA; F = 15.33, P < 0.001). Whilst causality cannot be directly attributed from these latter exposures, they provide an important illustration of the potential utility of esterase activity as a biomarker of environmental quality in this ecologically relevant sentinel species. - This paper provides a preliminary characterisation of esterase enzyme activities in the tissues and body fluids of the sediment dwelling worm Arenicola marina and explores their potential use as biomarkers of organophosphorus pesticide exposure in the marine environment.

  8. La Infantería de Marina, una fuerza para el siglo XXI

    Directory of Open Access Journals (Sweden)

    González Muñoz, Francisco

    2002-10-01

    Full Text Available Not available

    Nuestra Infantería de Marina es la más antigua del mundo. Sus orígenes se remontan al Tercio de Ñapóles de 1537, y desde entonces sus fuerzas han mantenido su tradición naval y expedicionaria con una permanente vinculación a la Armada. Tras una referencia histórica a las diferentes campañas en que ha participado la Infantería de Marina, el que fue su Comandante General durante los últimos cuatro años nos introduce en las vicisitudes y proceso de evolución de este Cuerpo como componente esencial de la Fuerza Anfibia de la Flota, destacando su versatilidad y capacidad de respuesta a las exigencias de hoy día para actuar como vanguardia de la proyección del poder naval en los nuevos escenarios estratégicos que se nos presentan. El artículo es una excelente síntesis para quien desee conocer qué.esy cómo opera la Infantería de Marina, cuáles son sus capacidades, medios, organización y estructura, y cómo está adaptándose para afrontar los desafíos del futuro a medio plazo.

  9. Habitat suitability analysis of eelgrass Zostera marina L. in the subtidal zone of Xiaoheishan Island

    Science.gov (United States)

    Zhou, Jian; Wang, Qixiang; Zhao, Wenxi; Yu, Daode; Guan, Shuguang

    2016-01-01

    We present a GIS-based habitat suitability index (HSI) model to identify suitable areas for Zostera marina L. restoration in the subtidal zone of Xiaoheishan Island. The controlling factors in the model, in order of importance, are Secchi depth, sediment composition, water temperature, salinity, current velocity, water depth and nutrient quality. Specific factor piecewise functions have been used to transform parameter values into normalized quality indexes. The weight of each factor was defined using expert knowledge and the analytic hierarchy process (AHP) method. All of the data thus obtained were interpolated using the inverse distance weighted (IDW) interpolation method to create maps for the entire region. In this study, the analysis of habitat suitability in the subtidal zone of Xiaoheishan Island was conducted for four seasons. According to the GIS-based HSI model, the optimal habitat of Zostera marina L. appears in spring, although habitat remains suitable all year round. On the whole, the optimum site for eelgrass restoration is located in the eastern region, followed by the western and southern regions. We believe that the GIS-based HSI model could be a promising tool to select sites for Zostera marina L. restoration and could also be applicable in other types of habitat evaluation.

  10. A tale of two seagrasses: Comparing the science and management of Zostera marina and Zostera japonica in the Pacific Northwest - CERF

    Science.gov (United States)

    On the Pacific coast of North America, at least two congeners of Zostera occur: native Z. marina, and introduced, Z. japonica. Z. marina is protected by State and Federal laws as essential fish habitat. Z. japonica is considered “invasive” and therefore, ecologicall...

  11. Effects of coexistence between the blue mussel Mytilus edulis and eelgrass Zostera marina on sediment biogeochemistry and plant performance

    DEFF Research Database (Denmark)

    Vinther, H.F.; Norling, P.; Kristensen, Per Sand

    2012-01-01

    significantly reduced at Mixed stations suggesting inhibiting effect of M. edulis on Z. marina. Negative correlations between eelgrass measures and sediment sulphide at Mixed stations indicate that presence of mussels increase sulphide invasion in the plants. A survey of 318 stations in Danish fjords suggests...... in Flensborg fjord, Denmark. Sediment and plant samples were collected at ten stations; five with Z. marina (Eelgrass) and five with Z. marina and M. edulis (Mixed) and at two unvegetated stations; one with mussels (Mussel) and one with sand (Sand). The Mixed sediment was enriched in fine particles (2-3 times......), nutrients and sulphides compared to Eelgrass stations. Increased sediment nutrient availability at the Mixed stations were reflected in increased N and P content in eelgrass. The plant biomass did, however, not differ significantly between stations, but shoot features (number of leaves and leaf areas) were...

  12. Constitution and energetics of photosystem I and photosystem II in the chlorophyll d-dominated cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Tomo, Tatsuya; Allakhverdiev, Suleyman I; Mimuro, Mamoru

    2011-01-01

    This mini review presents current topics of discussion about photosystem (PS) I and PS II of photosynthesis in the Acaryochloris marina. A. marina is a photosynthetic cyanobacterium in which chlorophyll (Chl) d is the major antenna pigment (>95%). However, Chl a is always present in a few percent. Chl d absorbs light with a wavelength up to 30 nm red-shifted from Chl a. Therefore, the chlorophyll species of the special pair in PS II has been a matter of debate because if Chl d was the special pair component, the overall energetics must be different in A. marina. The history of this field indicates that a purified sample is necessary for the reliable identification and characterization of the special pair. In view of the spectroscopic data and the redox potential of pheophytin, we discuss the nature of special pair constituents and the localization of the enigmatic Chl a.

  13. Antifungal Effect of the Aqueous and Ethanolic Avicennia marina Extracts on Alternaria citri and Penicillium digitatum

    Directory of Open Access Journals (Sweden)

    Behrooz Alizadeh Behbahani

    2016-02-01

    Full Text Available Background Plants have a great potential for producing new drugs of great benefit to mankind. There are many approaches to the search for new biologically active principles in higher plants. Objectives The aim of this study was to determine antifungal effect of the aqueous and ethanolic extracts of Avicennia marina on Penicillium digitatum and Alternaria citri in vitro. Materials and Methods In this experimental study, antimicrobial effects of extract were determined by screening antimicrobial activity and disk agar diffusion test in 20, 40, 60 and 80 mg/mL concentration of the extract against P. digitatum and A. citri. Minimum inhibitory concentration (MIC and minimum fungicidal concentration (MFC were determined by incorporating various concentrations of extracts in Sabouraud dextrose agar (SDA in tubes against P. digitatum and A. citri. The data were analyzed using one way analysis of variance (ANOVA using SPSS-17. Results The results indicate that extracts of A. marina mostly had been effective on P. digitatum and have the least impact on A. citri. The results show that the ethanol extract of mangrove leaf with antimicrobial activity method in 2 mg/mL, were inhibited the growth of P. digitatum and A. citri. In disk agar diffusion test the mentioned extract were shown inhibition effect on pathogen molds growth (P < 0.05. Conclusions Ethanolic extract compared to the aqueous extract was more effective and has a greater inhibition effect. The results of this study showed that the extract of A. marina has antifungal properties that justify their traditional use as medicinal plants.

  14. Biology of the Marine Heterotrophic Dinoflagellate Oxyrrhis marina: Current Status and Future Directions.

    Science.gov (United States)

    Guo, Zhiling; Zhang, Huan; Liu, Sheng; Lin, Senjie

    2013-10-21

    Heterotrophic dinoflagellates are prevalent protists in marine environments, which play an important role in the carbon cycling and energy flow in the marine planktonic community. Oxyrrhismarina (Dinophyceae), a widespread heterotrophic dinoflagellate, is a model species used for a broad range of ecological, biogeographic, and evolutionary studies. Despite the increasing research effort on this species, there lacks a synthesis of the existing data and a coherent picture of this organism. Here we reviewed the literature to provide an overview of what is known regarding the biology of O. marina, and identify areas where further studies are needed. As an early branch of the dinoflagellate lineage, O. marina shares similarity with typical dinoflagellates in permanent condensed chromosomes, less abundant nucleosome proteins compared to other eukaryotes, multiple gene copies, the occurrence of trans-splicing in nucleus-encoded mRNAs, highly fragmented mitochondrial genome, and disuse of ATG as a start codon for mitochondrial genes. On the other hand, O. marina also exhibits some distinct cytological features (e.g., different flagellar structure, absence of girdle and sulcus or pustules, use of intranuclear spindle in mitosis, presence of nuclear plaque, and absence of birefringent periodic banded chromosomal structure) and genetic features (e.g., a single histone-like DNA-associated protein, cob-cox3 gene fusion, 5' oligo-U cap in the mitochondrial transcripts of protein-coding genes, the absence of mRNA editing, the presence of stop codon in the fused cob-cox3 mRNA produced by post-transcriptional oligoadenylation, and vestigial plastid genes). The best-studied biology of this dinoflagellate is probably the prey and predators types, which include a wide range of organisms. On the other hand, the abundance of this species in the natural waters and its controlling factors, genome organization and gene expression regulation that underlie the unusual cytological and

  15. The Existing Condition of Mangrove Region of Avicenia marina, Its: Distribution and Functional Transformation

    Directory of Open Access Journals (Sweden)

    Ahmad Herison

    2014-04-01

    Full Text Available Mangrove ecosystem existence is important for environment and other organisms because of its ecological and economical values, so that management and preservation of mangrove ecosystem are needed. The purpose of this research was to determine the existing condition of mangrove, both its distribution and its functional transformation in Indah Kapuk Coastal Area. Avicennia marina  becomes important as wave attenuation,  a form of abrasion antidote. Transect-Square and Spot-Check methods were used to determine the existing condition of A.marina mangrove forests. Autocad program, coordinate converter, Google Earth, Google Map, and Arc View were applied in process of making mangrove distribution map. In western of research location exactly at Station 1 and Station 2, the density value of mangrove was 450 and 825 tree ha-1, respectively with  sparse category because they were contaminated by waste and litter. In eastern of research location namely Station 3, Station 4, and Station 5 the mangroves grow well with density value of 650 (sparse, 1,500 (very dense, and 1,200 tree ha-1 (fair, respectively, eventhough the contamination still happened. The mangrove forests around the stations do not function as wave attenuation because there were many waterfront constructions which have replaced the function of mangrove forests to damp the wave. In short, it can be stated that the mangrove's function has changed in a case of wave attenuation. The function of mangrove forests is not determined by mangrove forest density but it is determined by mangrove's free position.Keywords: Avicennia marina, mangrove, wave attenuation, waterfront constructions

  16. Photosystem Trap Energies and Spectrally-Dependent Energy-Storage Efficiencies in the Chl d-Utilizing Cyanobacterium, Acaryochloris Marina

    Science.gov (United States)

    Mielke, Steven P.; Kiang, Nancy Y.; Blankenship, Robert E.; Mauzerall, David

    2012-01-01

    Acaryochloris marina is the only species known to utilize chlorophyll (Chl) d as a principal photopigment. The peak absorption wavelength of Chl d is redshifted approx. 40 nm in vivo relative to Chl a, enabling this cyanobacterium to perform oxygenic phototrophy in niche environments enhanced in far-red light. We present measurements of the in vivo energy-storage (E-S) efficiency of photosynthesis in A. marina, obtained using pulsed photoacoustics (PA) over a 90-nm range of excitation wavelengths in the red and far-red. Together with modeling results, these measurements provide the first direct observation of the trap energies of PSI and PSII, and also the photosystem-specific contributions to the total E-S efficiency. We find the maximum observed efficiency in A. marina (40+/-1% at 735 nm) is higher than in the Chl a cyanobacterium Synechococcus leopoliensis (35+/-1% at 690 nm). The efficiency at peak absorption wavelength is also higher in A. marina (36+/-1% at 710 nm vs. 31+/-1% at 670 nm). In both species, the trap efficiencies are approx. 40% (PSI) and approx. 30% (PSII). The PSI trap in A. marina is found to lie at 740+/-5 nm, in agreement with the value inferred from spectroscopic methods. The best fit of the model to the PA data identifies the PSII trap at 723+/-3 nm, supporting the view that the primary electron-donor is Chl d, probably at the accessory (ChlD1) site. A decrease in efficiency beyond the trap wavelength, consistent with uphill energy transfer, is clearly observed and fit by the model. These results demonstrate that the E-S efficiency in A. marina is not thermodynamically limited, suggesting that oxygenic photosynthesis is viable in even redder light environments.

  17. Biofilm growth and near-infrared radiation-driven photosynthesis of the chlorophyll d-containing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Behrendt, Lars; Schrameyer, Verena; Qvortrup, Klaus; Lundin, Luisa; Sørensen, Søren J; Larkum, Anthony W D; Kühl, Michael

    2012-06-01

    The cyanobacterium Acaryochloris marina is the only known phototroph harboring chlorophyll (Chl) d. It is easy to cultivate it in a planktonic growth mode, and A. marina cultures have been subject to detailed biochemical and biophysical characterization. In natural situations, A. marina is mainly found associated with surfaces, but this growth mode has not been studied yet. Here, we show that the A. marina type strain MBIC11017 inoculated into alginate beads forms dense biofilm-like cell clusters, as in natural A. marina biofilms, characterized by strong O(2) concentration gradients that change with irradiance. Biofilm growth under both visible radiation (VIS, 400 to 700 nm) and near-infrared radiation (NIR, ∼700 to 730 nm) yielded maximal cell-specific growth rates of 0.38 per day and 0.64 per day, respectively. The population doubling times were 1.09 and 1.82 days for NIR and visible light, respectively. The photosynthesis versus irradiance curves showed saturation at a photon irradiance of E(k) (saturating irradiance) >250 μmol photons m(-2) s(-1) for blue light but no clear saturation at 365 μmol photons m(-2) s(-1) for NIR. The maximal gross photosynthesis rates in the aggregates were ∼1,272 μmol O(2) mg Chl d(-1) h(-1) (NIR) and ∼1,128 μmol O(2) mg Chl d(-1) h(-1) (VIS). The photosynthetic efficiency (α) values were higher in NIR-irradiated cells [(268 ± 0.29) × 10(-6) m(2) mg Chl d(-1) (mean ± standard deviation)] than under blue light [(231 ± 0.22) × 10(-6) m(2) mg Chl d(-1)]. A. marina is well adapted to a biofilm growth mode under both visible and NIR irradiance and under O(2) conditions ranging from anoxia to hyperoxia, explaining its presence in natural niches with similar environmental conditions.

  18. An assessment of site suitability for marina construction in Istanbul, Turkey, using GIS and AHP multicriteria decision analysis.

    Science.gov (United States)

    Gumusay, Mustafa Umit; Koseoglu, Gokalp; Bakirman, Tolga

    2016-12-01

    Marinas play a key role in sea transportation and tourism. The problem of an insufficient marina capacity has revealed in terms of sea traffic due to the demographic structure and increasing tourism potential of Istanbul which is the biggest metropolitan city of Turkey and has around 600-km-long coastline. Therefore, the study area is mainly focused on the Marmara Sea shoreline of Istanbul. Rather than traditional methods, a rapid and cost-effective solution which considers natural and urban environment conditions is essential to satisfy the need for a marina site selection. Thanks to the latest improvements in geographic information systems, it is convenient to perform location selection analysis of marinas taking advantages of geology, land use, demography and accessibility data sets. The goal of this study is to define the areas that are appropriate for building marinas, with the use of topographic and demographic data in a present shoreline applying analytical hierarchy process multicriteria decision-making method. In this study, erosion, landslide, tsunami, land use, geologically hazardous areas, transfer lines, sea traffic data, neighbourhood scale population, age patterns and house income data have been used. Analytical hierarchy process method is used to give a weight to each data set, and a grading system has been developed for the area selection of marinas. The result maps of the analysis that show study area as classified into four categories from good to not suitable are presented. It is possible to create a decision support system for upper scale plans that enable authorities to perform analysis accurately, cost and time effectively using the proposed methodology that integrates multiple data sets with different scales and types.

  19. Temporal and spatial dynamics of ephemeral macroalgal communities in eelgrass, Zostera marina, beds

    DEFF Research Database (Denmark)

    Rasmussen, Jonas; Pedersen, Morten Foldager; Olesen, Birgit;

    in algal cover was inversely correlated with the cover of eelgrass, Zostera marina, suggesting that algae were retained by the eelgrass leaves. At the larger spatial scale algal cover was less variable and significant changes occurred just a few times during the study periods. Variability was caused either...... by algal growth, as indicated by a steady increase in cover, or by physical forces moving large aggregations of algae into or out of the study area leading to significant changes in cover within few days. Thus, in shallow coastal ecosystems aggregations of ephemeral macroalgae can be highly dynamic, algae...

  20. Effects of filamentous macroalgae mats on growth and survival of eelgrass, Zostera marina, seedlings

    DEFF Research Database (Denmark)

    Rasmussen, Jonas; Olesen, Birgit; Krause-Jensen, Dorte

    2012-01-01

    A laboratory experiment was conducted to assess the effect of filamentous algae mats on the performance of seedlings of the eelgrass, Zostera marina. The seedlings were covered by three levels (3, 6 and 9 cm) of natural (Chaetomorpha linum) and imitation algae mats and it was hypothesized...... that the effects of the natural algae on seedling growth may be more severe because of the metabolic demands of the algae. Results show that coverage by both C. linum and imitation algae significantly reduced seedling growth and increased allocation of resources to above ground tissues. No clear effects of algae...

  1. Guía de las especies introducidas marinas y costeras de Colombia.

    OpenAIRE

    2011-01-01

    Este libro tiene como objetivo presentar una lista ilustrada preliminar de las especies identificadas y registradas como exóticas sobre los ambientes marino-costeros de Colombia hasta el momento, o de las cuales se tiene alguna evidencia de su presencia, con el fin de aportar información sobre el estado de la biodiversidad marina colombiana, contribuyendo con información de línea base que servirá para la elaboración de planes de contingencia ante posibles amenazas. Así mismo, ofrece una lista...

  2. Actividad antioxidante de algas y plantas marinas de la plataforma insular cubana

    OpenAIRE

    O Valdés; Hernádez, Y.; Fernández, M. D.; Hernández, I.; Rodriguez,M.; Cano, M.; A. Laguna; Díaz, C.; Cabrera, B.

    2008-01-01

    En el presente trabajo se estudia la capacidad antioxidante de varios extractos, acuosos e hidro-alcohólicos obtenidos a partir de algas y plantas marinas de la plataforma insular cubana. A todos los extractos se les determinó su contenido de polifenoles, proteínas, lípidos y azúcares totales, así como la actividad Superóxido Dismutasa (SOD). Todos los extractos evaluados mostraron una buena actividad antioxidante, con una CE50 inferior de 0,4 mg.ml-1. El cont...

  3. Seasonal acclimation in metabolism reduces light requirements of eelgrass (Zostera marina)

    DEFF Research Database (Denmark)

    Stæhr, Peter A.; Borum, Jens

    2011-01-01

    We investigated the ability of eelgrass (Zostera marina) to adjust light requirements to seasonal changes in temperature, light and nutrient conditions through changes in metabolism, pigment and nutrient content. In agreement with expectations we found that rates of respiration and light saturated...... photosynthesis of summer acclimated plants peaked at higher temperatures (5 °C and 2 °C higher, respectively), and were lower than of winter acclimated plants, both at sub- and supra-optimal temperatures. Moreover respiration rates were generally more sensitive to increasing temperatures than photosynthetic...

  4. Ritos de passagem contemporâneos em Marina Colasanti: passagens e ressurgências

    OpenAIRE

    Faccin, Fernanda Pina dos Reis

    2013-01-01

    Para a presente dissertação selecionaram-se quatro contos do livro O leopardo é um animal delicado, de Marina Colasanti: Menina de vermelho a caminho da Lua ; O leopardo é um animal delicado ; As regras do jogo e Sem que seja de joelhos . Os contos elencados apresentam, em suas narrativas, ritos de passagem que se encontram em contextos distintos, embora compartilhem da mesma dinâmica metamórfica, caracterizada pelas passagens, pois há uma correspondência entre as diversas modalidades de...

  5. Mecanismos de toxicidad y permeabilidad transepitelial de toxinas marinas y de agua dulce

    OpenAIRE

    Fernández Martínez, Diego Alberto

    2015-01-01

    La presente tesis doctoral aporta datos experimentales que permiten comprender mejor los efectos que las toxinas marinas Palitoxina (PLTX), Ácido Okadaico (OA), Dinofisistoxina 1 y 2 (DTX-1 y DTX-2) y la toxina de agua dulce Cilindrospermopsina (CYN), pueden ejercer sobre la salud humana y animal. Con esta finalidad se investiga la citotoxicidad y las alteraciones citomorfológicas que estos compuestos desencadenan en células intestinales, hepáticas y nerviosas. También se evalú...

  6. Chasing the Intangible: a Conversation on Theatre, Language, and Artistic Migrations with Irish Playwright Marina Carr

    OpenAIRE

    Valentina Rapetti

    2014-01-01

    Offally born Marina Carr is amongst the most prolific, influential and internationally renowned Irish playwrights of our times. Since her debut on the avant-garde side of the Dublin theatre scene in the late Eighties, she has had  seventeen plays professionally produced, both in and outside Ireland. Her earlier work is influenced by Samuel Beckett’s Absurdist drama, while in her most mature and recent plays she draws on both classical and Irish mythology, Greek tragedies and Shakespeare’s poe...

  7. Biodisponibilidad y especiación de arsénico en las algas marinas

    OpenAIRE

    García Sartal, Cristina

    2013-01-01

    Las algas, desde un punto de vista alimenticio, constituyen una fuente de proteínas, aminoácidos esenciales, vitaminas, lípidos y minerales. Sin embargo, las algas también pueden acumular elementos no esenciales procedentes del agua marina circundante, entre ellos, el arsénico, elemento ampliamente reconocido por su toxicidad. La toxicidad del arsénico depende fundamentalmente de su especiación, resultando más toxicas las especies inorgánicas de arsénico que sus correspondie...

  8. Foleyellides rhinellae sp. nov. (Nematoda, Onchocercidae) a new filaria parasitizing Rhinella marina (Anura, Bufonidae) in Mexico.

    Science.gov (United States)

    García-Prieto, Luis; Ruiz-Torres, Nallely; Osorio-Sarabia, David; Merlo-Serna, Aldo

    2014-09-01

    A new nematode species, Foleyellides rhinellae sp. nov. (Onchocercidae), is described from specimens found in the body cavity of the cane toad, Rhinella marina (Linnaeus) (Anura, Bufonidae), in the Laguna de Coyuca, Guerrero, in the Pacific slope of Mexico. The new species differs from the other nine species of Foleyellides by infecting bufonid anurans and by the number and arrangement of caudal papillae. Other distinguishing feature of the new species is the size of the left spicule (0.16-0.23 long), the smallest recorded among the species included in the genus. Foleyellides rhinellae sp. nov. is the second known species of the genus recorded from amphibians of Mexico.

  9. Cadmium distribution in sediment and the lugworm Arenicola marina in a low concentration exposure experiment

    Digital Repository Service at National Institute of Oceanography (India)

    Everaarts, J.M.; Devi, K.S.

    /L), which is about 10 times the background concentration of the western Wadden Sea. Two aquaria were used as controls. The experiment lasted 36 days, with intermittent Cd dosing from days 0 to 5 and from days 15 to 25. The animals were not fed during... Bull. Environ. Contam. Toxicol. (1996) 57:771-778 © 1996 Springer-Verlag New York Inc. Cadmium Distribution in Sediment and the Lugworm Arenicola marina in a Low Concentration Exposure Experiment J. M. Everaarts,1 K. SaralaDevi2 1Netherlands Institute...

  10. Morphological characterization of Eustrongylides sp. larvae (Nematoda, Dioctophymatoidea) parasite of Rhinella marina (Amphibia: Bufonidae) from Eastern Amazonia.

    Science.gov (United States)

    Melo, Francisco Tiago de Vasconcelos; Melo, Caroline do Socorro Barros; Nascimento, Luciana de Cássia Silva do; Giese, Elane Guerreiro; Furtado, Adriano Penha; Santos, Jeannie Nascimento Dos

    2016-06-07

    Absctract Eustrongylides spp. nematodes have birds as final hosts and uses other vertebrates as intermediate/paratenic host (fish, amphibians and reptiles) and have zoonotic potential. In amphibians, the larvae may be located in the subcutaneous tissues, liver and mesentery, between the muscle fibres, especially in the lower limbs. Rhinella marina, which is widely observed in Brazil, has exhibited complex diversity in its helminth fauna, reflecting the unique habitat of the Amazon biome. For the first time, this study describes the morphological aspects of third-stage larvae of Eustrongylides sp. in Rhinella marina from Santa Cruz do Ararí, Marajó Archipelago, Eastern Amazonia, using light and scanning electron microscopy.

  11. Endotoxin structures in the psychrophiles Psychromonas marina and Psychrobacter cryohalolentis contain distinctive acyl features.

    Science.gov (United States)

    Sweet, Charles R; Alpuche, Giancarlo M; Landis, Corinne A; Sandman, Benjamin C

    2014-07-09

    Lipid A is the essential component of endotoxin (Gram-negative lipopolysaccharide), a potent immunostimulatory compound. As the outer surface of the outer membrane, the details of lipid A structure are crucial not only to bacterial pathogenesis but also to membrane integrity. This work characterizes the structure of lipid A in two psychrophiles, Psychromonas marina and Psychrobacter cryohalolentis, and also two mesophiles to which they are related using MALDI-TOF MS and fatty acid methyl ester (FAME) GC-MS. P. marina lipid A is strikingly similar to that of Escherichia coli in organization and total acyl size, but incorporates an unusual doubly unsaturated tetradecadienoyl acyl residue. P. cryohalolentis also shows structural organization similar to a closely related mesophile, Acinetobacter baumannii, however it has generally shorter acyl constituents and shows many acyl variants differing by single methylene (-CH2-) units, a characteristic it shares with the one previously reported psychrotolerant lipid A structure. This work is the first detailed structural characterization of lipid A from an obligate psychrophile and the second from a psychrotolerant species. It reveals distinctive structural features of psychrophilic lipid A in comparison to that of related mesophiles which suggest constitutive adaptations to maintain outer membrane fluidity in cold environments.

  12. The genome of the seagrass Zostera marina reveals angiosperm adaptation to the sea.

    Science.gov (United States)

    Olsen, Jeanine L; Rouzé, Pierre; Verhelst, Bram; Lin, Yao-Cheng; Bayer, Till; Collen, Jonas; Dattolo, Emanuela; De Paoli, Emanuele; Dittami, Simon; Maumus, Florian; Michel, Gurvan; Kersting, Anna; Lauritano, Chiara; Lohaus, Rolf; Töpel, Mats; Tonon, Thierry; Vanneste, Kevin; Amirebrahimi, Mojgan; Brakel, Janina; Boström, Christoffer; Chovatia, Mansi; Grimwood, Jane; Jenkins, Jerry W; Jueterbock, Alexander; Mraz, Amy; Stam, Wytze T; Tice, Hope; Bornberg-Bauer, Erich; Green, Pamela J; Pearson, Gareth A; Procaccini, Gabriele; Duarte, Carlos M; Schmutz, Jeremy; Reusch, Thorsten B H; Van de Peer, Yves

    2016-02-18

    Seagrasses colonized the sea on at least three independent occasions to form the basis of one of the most productive and widespread coastal ecosystems on the planet. Here we report the genome of Zostera marina (L.), the first, to our knowledge, marine angiosperm to be fully sequenced. This reveals unique insights into the genomic losses and gains involved in achieving the structural and physiological adaptations required for its marine lifestyle, arguably the most severe habitat shift ever accomplished by flowering plants. Key angiosperm innovations that were lost include the entire repertoire of stomatal genes, genes involved in the synthesis of terpenoids and ethylene signalling, and genes for ultraviolet protection and phytochromes for far-red sensing. Seagrasses have also regained functions enabling them to adjust to full salinity. Their cell walls contain all of the polysaccharides typical of land plants, but also contain polyanionic, low-methylated pectins and sulfated galactans, a feature shared with the cell walls of all macroalgae and that is important for ion homoeostasis, nutrient uptake and O2/CO2 exchange through leaf epidermal cells. The Z. marina genome resource will markedly advance a wide range of functional ecological studies from adaptation of marine ecosystems under climate warming, to unravelling the mechanisms of osmoregulation under high salinities that may further inform our understanding of the evolution of salt tolerance in crop plants.

  13. Phenology and Growth dynamics of Avicennia marina in the Central Red Sea

    KAUST Repository

    Almahasheer, Hanan

    2016-11-28

    The formation of nodes, stem elongation and the phenology of stunted Avicennia marina was examined in the Central Red Sea, where Avicennia marina is at the limit of its distribution range and submitted to extremely arid conditions with salinity above 38 psu and water temperature as high as 35° C. The annual node production was rather uniform among locations averaging 9.59 node y−1, which resulted in a plastocron interval, the interval in between production of two consecutive nodes along a stem, of 38 days. However, the internodal length varied significantly between locations, resulting in growth differences possibly reflecting the environmental conditions of locations. The reproductive cycle lasted for approximately 12 months, and was characterized by peak flowering and propagule development in November and January. These phenological observations provide a starting point for research and restoration programs on the ecology of mangroves in the Central Red Sea, while the plastochrone index reported here would allow calculations of the growth and production of the species from simple morphological measurements.

  14. Nutrient Dynamics in an Avicennia marina (Forsk. Vierh., Mangrove Forest in Vamleshwar, Gujarat, India

    Directory of Open Access Journals (Sweden)

    Isaiah Nirmal KUMAR

    2011-03-01

    Full Text Available The study was carried out to determine the nutrient budget of plants, sediments and nutrient dynamics in an Avicennia marina (Forsk. Vierh., dominated forest in Vamleshwar near Narmada estuary, West Coast of Gujarat for a period of one year from November 2008 to October 2009. The average tree height of the mangrove is 1.5 to 2 m without much vertical stratification. Allometric methodology was used to measure the biomass, and yield a figure of 86.47 t ha-1 and the litter fall rate amounted to 2.9 t ha-1. Nutrient stocks of N, P and K in this mangrove were 137.05, 14.38 and 241.29 kg ha-1, with an annual accumulation of 55.74, 12.38 and 83.94 kg ha-1, and an annual return of 51.30, 10.83 and 13.52 kg ha-1, respectively, in the form of litter. The annual uptake for N, P and K were 61.04, 14.28 and 97.46 kg ha-1, and turnover rates of N, P and K were estimated at 3, 6 and 14 years, respectively, for the study period. Flow coefficients, which reveal the dynamic processes of nutrients between mangrove plants and sediments, are also explained. The present study concluded that the A. marina dominated mangrove plantation is more efficient in nutrient use and conservation.

  15. EVALUACIÓN DE ACTITUDES FRENTE AL USO DE LAS TORTUGAS MARINAS EN PLAYA GANDOCA

    Directory of Open Access Journals (Sweden)

    M Malaver

    2008-01-01

    Full Text Available en el refugio nacional de vida silvestre Gandoca-Manzanillo, Costa rica, se creó en 1986 un programa para la protección y conservación de la población anidadora de tortugas marinas. Esta evaluación buscaba identificar los aspectos que predisponen a la población a actuar de una forma determinada utilizando el modelo metodológico denominado teoría de facetas; este modelo parte de una frase mapa que enmarca la hipótesis, y con la cual se elaboró el cuestionario de evaluación que se aplicó a 106 habitantes de la comunidad de Gandoca, lo que corresponde al 40% del total de pobladores según el instituto nacional de estadística y Censos (2000. en general, los resultados mostraron que la actitud de la población de Gandoca hacia el uso que se le debe dar a las tortugas marinas se basa en el elemento emocional, donde el turismo tiene gran aceptación, y donde existe en limitada medida la responsabilidad de las acciones hacia el objeto de la actitud.

  16. Bohemia as the Homeland of the Soul in the Letters of Marina Tsvetaeva to Anna Teskova

    Directory of Open Access Journals (Sweden)

    Massimo Tria

    2014-03-01

    Full Text Available The article examines the letters sent by Marina Tsvetaeva to the translator and public figure Anna Teskova, who was one of the few poet’s Czech intimate friends, whom she met during her stay in Czechoslovakia (1922-1925. In the first part of the paper the Author focuses on the echoes of Prague and its culture in this specific correspondence, trying to ascertain to which extent Marina Tsvetaeva was acquainted with the cultural world she lived in: the lack of knowledge of the Czech language and the limited relationships with Prague intellectuals didn’t allow her to get a deep insight of the Czech cultural milieu. The textual analysis of the letters, though, on the basis of key concepts as “родной”, “родина”, “честь”, confirms the presence of a persistent feeling of Prague-homesickness in Tsvetaeva’s psycho- logical world, which brought her to develop an alternative model of Homeland, substitute to her native Russia and to Germany, which disappointed her after the rise of the Nazi Regime. Through this unique correspondence (including the first part of her Verses dedicated to Bohemia we gain the certainty that Tsvetaeva discovered in Prague and in the Czech lands an idealized model of a pacific, beautiful and faithful Homeland.

  17. Understanding the Ecoydrology of Mangroves: A Simple SPAC Model for Avicennia Marina

    Science.gov (United States)

    Perri, Saverio; Viola, Francesco; Valerio Noto, Leonardo; Molini, Annalisa

    2015-04-01

    Mangroves represent one of the most carbon-rich ecosystems in the Tropics, noticeably impacting ecosystem services and the economy of these regions. Whether the ability of mangroves to exclude and tolerate salt has been extensively investigated in the literature - both from the structural and functional point of view - their eco-hydrological characteristics remains largely understudied, despite the crucial link with productivity, efficient carbon storage and fluxes. In this contribution we develop a "first-order" Soil Plant Atmosphere Continuum model for Avicennia Marina, a mangrove able to adapt to hyper-arid intertidal zones and characterized by complex morphological and eco-physiological traits. Among mangroves, Avicennia marina is one of the most tolerant to salinity and arid climatic conditions. Our model, based on a simple macroscopic approach, takes into account the specific characteristics of the mangrove ecosystem and in particular, the salinity of the water in the soil and the levels of salt stress to which the plant may be subjected. Mangrove transpiration is hence obtained by solving the plant and leaf water balance and the leaf energy balance, taking explicitly into account the role of osmotic water potential and salinity in governing plant resistance to water fluxes. The SPAC model of Avicennia is hence tested against experimental data obtained from the literature, showing the reliability and effectiveness of this minimalist model in reproducing observed transpiration fluxes. Finally, sensitivity analysis is used to assess whether uncertainty on the adopted parameters could lead to significant errors in the transpiration assessment.

  18. The Existing Condition of Mangrove Region of Avicenia marina, Its: Distribution and Functional Transformation

    Directory of Open Access Journals (Sweden)

    Ahmad Herison

    2014-04-01

    Full Text Available Mangrove ecosystem existence is important for environment and other organisms because of its ecological and economical values, so that management and preservation of mangrove ecosystem are needed. The purpose of this research was to determine the existing condition of mangrove, both its distribution and its functional transformation in Indah Kapuk Coastal Area. Avicennia marina becomes important as wave attenuation, a form of abrasion antidote. Transect-Square and Spot-Check methods were used to determine the existing condition of A.marina mangrove forests. Autocad program, coordinate converter, Google Earth, Google Map, and Arc View were applied in process of making mangrove distribution map. In western of research location exactly at Station 1 and Station 2, the density value of mangrove was 450 and 825 tree ha-1, respectively with sparse category because they were contaminated by waste and litter. In eastern of research location namely Station 3, Station 4, and Station 5 the mangroves grow well with density value of 650 (sparse, 1,500 (very dense, and 1,200 tree ha-1 (fair, respectively, eventhough the contamination still happened. The mangrove forests around the stations do not function as wave attenuation because there were many waterfront constructions which have replaced the function of mangrove forests to damp the wave. In short, it can be stated that the mangrove's function has changed in a case of wave attenuation. The function of mangrove forests is not determined by mangrove forest density but it is determined by mangrove's free position.

  19. Biosynthesis of silver nanoparticles from mangrove plant (Avicennia marina) extract and their potential mosquito larvicidal property.

    Science.gov (United States)

    Balakrishnan, Srinivasan; Srinivasan, Muthukumarasamy; Mohanraj, Jeyaraj

    2016-09-01

    To identify the larvicidal activities of silver nanoparticles synthesised with Avicennia marina leaf extract against the larvae of Aedes aegypti and Anopheleus stephensi, in vitro larvicidal activities such as LC50 and LC90 were assessed. Further, characterisation such as UV and FTIR analysis were carried out for the synthesised silver nanoparticles. The LC50 value of the synthesised silver nanoparticles was identified as 4.374 and 7.406 mg/L for An. stephensi and Ae. aegypti larvae respectively. Further, the LC90 values are also identified as 4.928 and 9.865 mg/L for An. stephensi and Ae. aegypti species respectively. The synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 nm. The FTIR data showed prominent peaks in (3940.57, 3929.00, 3803.63, 3712.97, 2918.30, 2231.64, 1610.50, 1377.17, 1257.59, 1041.59, 1041.56, 775.38, 667.37 and 503.21) different ranges. The biosynthesis of silver nanoparticles with leaf aqueous extract of A. marina provides potential source for the larvicidal activity against mosquito borne diseases. The present study proved the mosquitocidal properties of silver nanoparticles synthesised from mangroves of Vellar estuary. This is an ideal eco-friendly approach for the vector control programs.

  20. Local replacement of ammophila arenaria by medicago marina after foredune trampling disturbance

    Directory of Open Access Journals (Sweden)

    Ana Ramos Pereira

    2013-06-01

    Full Text Available Human trampling is amongst the major causes of foredune disturbance. it creates a diffuse path network and the opening of bare‑ground clearings within dense vegetation patches as a result of plant removal, namely of Ammophila arenaria. in undisturbed plant communities A. arenaria becomes dominant, and strongly inhibits the co‑existence of other species, due to its phalanx growth strategy and by decreasing sand mobility near the surface. However, the dominance of this dune‑builder may be locally reversed after trampling disturbance. Data gathered in three foredune ‑sites at Vila nova de Gaia during 2006, three years after a major intervention by the Municipality to manage beach access through the dunes, suggest that a higher abundance of Medicago marina is linked to an increased availability of recruitment sites, due to death of A. arenaria individuals. acting as a powerful sand stabiliser, M. marina creates favourable conditions for annual species colonization of paths and gaps, significantly changing sand movement and deposition along the foredune gradient.

  1. Antioxidant and antimicrobial activity of a mangrove plant Avicennia marina (Forsk.)

    Institute of Scientific and Technical Information of China (English)

    Pooja Moteriya; Ashish Dalsaniya; Sumitra Chanda

    2015-01-01

    Objective: To evaluate the antioxidant and antimicrobial potential of different parts (leaf, stem and pneumatophore) of a mangrove plant Avicennia marina (Forsk.) Vierh (Avicenniaceae). Methods: The extraction was done by cold percolation method using solvents of hexane, ethyl acetate, acetone, methanol and water. Total phenol and flavonoid content were measured by Folin-Ciocalteu’s reagent and aluminium chloride colorimetric method respectively. The antioxidant activity was evaluated using antioxidant assays of 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity, superoxide radical scavenging assay, 2,2’-azino-bis-(3-ethyl) benzothiazoline-6-sulfonic acid, ferric reducing antioxidant power and reducing capacity assessment. The antibacterial activity was done by agar well diffusion method against four Gram-positive, four Gram-negative bacteria and four fungi. Results: Different antioxidant assays showed different levels of activity in different parts and different solvent extracts. Overall, acetone extract of stem showed the best antioxidant activity. The Gram-positive bacteria were more susceptible than Gram-negative bacteria and fungi. Conclusions: The results indicated extract of Avicennia marina can be used as a promising source of natural antioxidant.

  2. Evaluation of antiherpetic activity of crude extract and fractions of Avicenna marina, in vitro.

    Science.gov (United States)

    Behbahani, Mandana; Zadeh, Mehrnaz Shanehsaz; Mohabatkar, Hassan

    2013-03-01

    This study was carried out to check antiherpetic substances of crude methanol leaf extract of Avicenna marina and its column chromatographic fractions. Herpes simplex virus 2 (HSV-2) is a harmful pathogen especially in highly susceptible individuals. The antiherpetic activity of crude methanol extract and sub-fractions was performed in different concentrations (20, 2, 0.2, and 0.02μg/ml) by use of plaque-forming unit (PFU) assay and real time polymerase chain reaction (PCR) assay. The most active fraction analyzed by NMR contained luteolin 7-O-methylether 3'-O-beta-d-glucoside (LMEG). The other active fraction was detected by HPLC as luteolin. The apparent effective concentrations for 50% plaque reduction (EC50) of crude methanol extract, LMEG, luteolin and ACV were 10, 5, 16.6 and 2.97μg/ml, respectively. The three extracts showed no cytotoxic effect on Vero cell line at concentrations of 32μg/ml or below. According to the consequences of time-of-addition studies, antiherpetic compound LMEG exerted an inhibitory effect on the early stage of HSV-2 infection during which it was added. In conclusion, LMEG isolated from A. marina could probably inhibit HSV attachment to the cell membrane and its entry into the cell. Copyright © 2013 Elsevier B.V. All rights reserved.

  3. Phenology and Growth dynamics of Avicennia marina in the Central Red Sea

    Science.gov (United States)

    Almahasheer, Hanan; Duarte, Carlos M.; Irigoien, Xabier

    2016-11-01

    The formation of nodes, stem elongation and the phenology of stunted Avicennia marina was examined in the Central Red Sea, where Avicennia marina is at the limit of its distribution range and submitted to extremely arid conditions with salinity above 38 psu and water temperature as high as 35° C. The annual node production was rather uniform among locations averaging 9.59 node y‑1, which resulted in a plastocron interval, the interval in between production of two consecutive nodes along a stem, of 38 days. However, the internodal length varied significantly between locations, resulting in growth differences possibly reflecting the environmental conditions of locations. The reproductive cycle lasted for approximately 12 months, and was characterized by peak flowering and propagule development in November and January. These phenological observations provide a starting point for research and restoration programs on the ecology of mangroves in the Central Red Sea, while the plastochrone index reported here would allow calculations of the growth and production of the species from simple morphological measurements.

  4. Effects of microplastic on fitness and PCB bioaccumulation by the lugworm Arenicola marina (L.).

    Science.gov (United States)

    Besseling, Ellen; Wegner, Anna; Foekema, Edwin M; van den Heuvel-Greve, Martine J; Koelmans, Albert A

    2013-01-02

    It has been speculated that marine microplastics may cause negative effects on benthic marine organisms and increase bioaccumulation of persistent organic pollutants (POPs). Here, we provide the first controlled study of plastic effects on benthic organisms including transfer of POPs. The effects of polystyrene (PS) microplastic on survival, activity, and bodyweight, as well as the transfer of 19 polychlorinated biphenyls (PCBs), were assessed in bioassays with Arenicola marina (L.). PS was pre-equilibrated in natively contaminated sediment. A positive relation was observed between microplastic concentration in the sediment and both uptake of plastic particles and weight loss by A. marina. Furthermore, a reduction in feeding activity was observed at a PS dose of 7.4% dry weight. A low PS dose of 0.074% increased bioaccumulation of PCBs by a factor of 1.1-3.6, an effect that was significant for ΣPCBs and several individual congeners. At higher doses, bioaccumulation decreased compared to the low dose, which however, was only significant for PCB105. PS had statistically significant effects on the organisms' fitness and bioaccumulation, but the magnitude of the effects was not high. This may be different for sites with different plastic concentrations, or plastics with a higher affinity for POPs.

  5. Microplastics are taken up by mussels (Mytilus edulis) and lugworms (Arenicola marina) living in natural habitats.

    Science.gov (United States)

    Van Cauwenberghe, Lisbeth; Claessens, Michiel; Vandegehuchte, Michiel B; Janssen, Colin R

    2015-04-01

    We studied the uptake of microplastics under field conditions. At six locations along the French-Belgian-Dutch coastline we collected two species of marine invertebrates representing different feeding strategies: the blue mussel Mytilus edulis (filter feeder) and the lugworm Arenicola marina (deposit feeder). Additional laboratory experiments were performed to assess possible (adverse) effects of ingestion and translocation of microplastics on the energy metabolism (cellular energy allocation) of these species. Microplastics were present in all organisms collected in the field: on average 0.2 ± 0.3 microplastics g(-1) (M. edulis) and 1.2 ± 2.8 particles g(-1) (A. marina). In a proof of principle laboratory experiment, mussels and lugworms exposed to high concentrations of polystyrene microspheres (110 particles mL(-1) seawater and 110 particles g(-1) sediment, respectively) showed no significant adverse effect on the organisms' overall energy budget. The results are discussed in the context of possible risks as a result of the possible transfer of adsorbed contaminants.

  6. Genome sequence of the ocean sediment bacterium Saccharomonospora marina type strain (XMU15T)

    Energy Technology Data Exchange (ETDEWEB)

    Klenk, Hans-Peter [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Lu, Megan [Los Alamos National Laboratory (LANL); Lucas, Susan [U.S. Department of Energy, Joint Genome Institute; Copeland, A [U.S. Department of Energy, Joint Genome Institute; Pitluck, Sam [U.S. Department of Energy, Joint Genome Institute; Goodwin, Lynne A. [Los Alamos National Laboratory (LANL); Han, Cliff [Los Alamos National Laboratory (LANL); Tapia, Roxanne [Los Alamos National Laboratory (LANL); Brambilla, Evelyne-Marie [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Potter, Gabriele [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Land, Miriam L [ORNL; Ivanova, N [U.S. Department of Energy, Joint Genome Institute; Rohde, Manfred [HZI - Helmholtz Centre for Infection Research, Braunschweig, Germany; Goker, Markus [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Detter, J. Chris [U.S. Department of Energy, Joint Genome Institute; Li, Wen-Jun [Yunnan University, Kunming, China; Kyrpides, Nikos C [U.S. Department of Energy, Joint Genome Institute; Woyke, Tanja [U.S. Department of Energy, Joint Genome Institute

    2012-01-01

    Saccharomonospora marina Liu et al. 2010 is a member to the genomically so far poorly characterized genus Saccharomonospora in the family Pseudonocardiaceae. Members of the genus Sacharomonospora are of interest because they originate from diverse habitats, such as leaf litter, manure, compost, surface of peat, moist, over-heated grain, and ocean sediment, where they might play a role in the primary degradation of plant material by attacking hemicellulose. Organisms belonging to the genus are usually Gram-positive staining, non-acid fast, and classify among the actinomycetes. Next to S. viridis and S. azurea, S. marina is the third member in the genus Saccharomonospora for with a completely sequenced (permanent draft status) type strain genome will be published. Here we describe the features of this organism, together with the complete genome sequence, and annotation. The 5,965,593 bp long chromosome with its 5,727 protein-coding and 57 RNA genes was sequenced as part of the DOE funded Community Sequencing Program (CSP) 2010 at the Joint Genome Institute (JGI).

  7. The genome of the seagrass Zostera marina reveals angiosperm adaptation to the sea

    KAUST Repository

    Olsen, Jeanine L.

    2016-01-27

    Seagrasses colonized the sea1 on at least three independent occasions to form the basis of one of the most productive and widespread coastal ecosystems on the planet2. Here we report the genome of Zostera marina (L.), the first, to our knowledge, marine angiosperm to be fully sequenced. This reveals unique insights into the genomic losses and gains involved in achieving the structural and physiological adaptations required for its marine lifestyle, arguably the most severe habitat shift ever accomplished by flowering plants. Key angiosperm innovations that were lost include the entire repertoire of stomatal genes3, genes involved in the synthesis of terpenoids and ethylene signalling, and genes for ultraviolet protection and phytochromes for far-red sensing. Seagrasses have also regained functions enabling them to adjust to full salinity. Their cell walls contain all of the polysaccharides typical of land plants, but also contain polyanionic, low-methylated pectins and sulfated galactans, a feature shared with the cell walls of all macroalgae4 and that is important for ion homoeostasis, nutrient uptake and O2/CO2 exchange through leaf epidermal cells. The Z. marina genome resource will markedly advance a wide range of functional ecological studies from adaptation of marine ecosystems under climate warming5, 6, to unravelling the mechanisms of osmoregulation under high salinities that may further inform our understanding of the evolution of salt tolerance in crop plants7.

  8. Endotoxin Structures in the Psychrophiles Psychromonas marina and Psychrobacter cryohalolentis Contain Distinctive Acyl Features

    Directory of Open Access Journals (Sweden)

    Charles R. Sweet

    2014-07-01

    Full Text Available Lipid A is the essential component of endotoxin (Gram-negative lipopolysaccharide, a potent immunostimulatory compound. As the outer surface of the outer membrane, the details of lipid A structure are crucial not only to bacterial pathogenesis but also to membrane integrity. This work characterizes the structure of lipid A in two psychrophiles, Psychromonas marina and Psychrobacter cryohalolentis, and also two mesophiles to which they are related using MALDI-TOF MS and fatty acid methyl ester (FAME GC-MS. P. marina lipid A is strikingly similar to that of Escherichia coli in organization and total acyl size, but incorporates an unusual doubly unsaturated tetradecadienoyl acyl residue. P. cryohalolentis also shows structural organization similar to a closely related mesophile, Acinetobacter baumannii, however it has generally shorter acyl constituents and shows many acyl variants differing by single methylene (-CH2- units, a characteristic it shares with the one previously reported psychrotolerant lipid A structure. This work is the first detailed structural characterization of lipid A from an obligate psychrophile and the second from a psychrotolerant species. It reveals distinctive structural features of psychrophilic lipid A in comparison to that of related mesophiles which suggest constitutive adaptations to maintain outer membrane fluidity in cold environments.

  9. APPARENT LACK OF VESICULAR-ARBUSCULAR MYCORRHIZA (VAM) IN SEAGRASSES ZOSTERA MARINA L. AND THALASSIA TESTUDIUM BANKS EX KONIG

    Science.gov (United States)

    We examined two populations of Zostera marina L. and one of Thalassia testudinum Banks ex Konig for presence of vesicular-arbuscular mycorrhiza (VAM). None of these plants showed any VAM colonization. In addition, we were unable to find any literature references on the presence o...

  10. Comparative-Study on Populations of Zostera-Marina L (Eelgrass) - in-Situ Nitrogen Enrichment and Light Manipulation

    NARCIS (Netherlands)

    Van Lent, F.; Verschuure, J.M.; Van Veghel, M.L.J.

    1995-01-01

    The combined effects of light and nitrogen availability on population dynamical characteristics (e.g. growth rate, biomass, density, flowering) of a perennial and semi-annual population of Zostera marina L. were experimentally studied in two non-tidal lagoons (Grevelingen and Veerse Meer). Light red

  11. Fine-scale spatial distribution of the common lugworm Arenicola marina, and effects of intertidal clam fishing

    Science.gov (United States)

    Boldina, Inna; Beninger, Peter G.

    2014-04-01

    Despite its ubiquity and its role as an ecosystem engineer on temperate intertidal mudflats, little is known of the spatial ecology of the lugworm Arenicola marina. We estimated lugworm densities and analyzed the spatial distribution of A. marina on a French Atlantic mudflat subjected to long-term clam digging activities, and compared these to a nearby pristine reference mudflat, using a combination of geostatistical techniques: point-pattern analysis, autocorrelation, and wavelet analysis. Lugworm densities were an order of magnitude greater at the reference site. Although A. marina showed an aggregative spatial distribution at both sites, the characteristics and intensity of aggregation differed markedly between sites. The reference site showed an inhibition process (regular distribution) at distances marina was clearly aggregated at both sites; however, the autocorrelation strength was much weaker at the impacted site. In addition, the non-impacted site presented multi-scale spatial distribution, which was not evident at the impacted site. The differences observed between the spatial distributions of the fishing-impacted vs. the non-impacted site reflect similar findings for other components of these two mudflat ecosystems, suggesting common community-level responses to prolonged mechanical perturbation: a decrease in naturally-occurring aggregation. This change may have consequences for basic biological characteristics such as reproduction, recruitment, growth, and feeding.

  12. Significance of salinity and silicon levels for growth of a formerly estuarine eelgrass (Zostera marina) population (Lake Grevelingen, the Netherlands)

    NARCIS (Netherlands)

    Kamermans, P.; Hemminga, M.A.; De Jong, D.J.

    1999-01-01

    Since the early 1980s, the eelgrass, Zostera marina L., population in the saline Lake Gevelingen, The Netherlands, is rapidly declining. An earlier study, in which long-term data on eelgrass coverage in this former estuary were correlated with several environmental variables, showed only one signifi

  13. APPARENT LACK OF VESICULAR-ARBUSCULAR MYCORRHIZA (VAM) IN SEAGRASSES ZOSTERA MARINA L. AND THALASSIA TESTUDIUM BANKS EX KONIG

    Science.gov (United States)

    We examined two populations of Zostera marina L. and one of Thalassia testudinum Banks ex Konig for presence of vesicular-arbuscular mycorrhiza (VAM). None of these plants showed any VAM colonization. In addition, we were unable to find any literature references on the presence o...

  14. Sæsontilpasninger i stofsikftet reducerer lyskravet hos ålegræs (Zostera marina)

    DEFF Research Database (Denmark)

    Stæhr, Peter A.; Borum, Jens

    for kuldetilpassede vinterplanter i februar (36% højere Q10-værdier). Disse ændringer blev fulgt af en nedsættelse i bladenes klorofyl (35%) og kvælstof (60%) indhold fra februar til august. Lyskompensationspunktet (EC) hvor Z. marina lige akkurat kan opretholde en positive kulstof balance, steg eksponentielt med...

  15. An effective seed protection method for planting Zostera marina (eelgrass) seeds: Implications for their large-scale restoration.

    Science.gov (United States)

    Zhang, Pei-Dong; Fang, Chao; Liu, Jie; Xu, Qiang; Li, Wen-Tao; Liu, Yan-Shan

    2015-06-15

    We describe an innovative method of planting Zostera marina (eelgrass) seeds in which hessian bags filled with high-silted sediments are used as a seed protecting device. Here, we evaluated the effectiveness of the method through a field seed-sowing experiment over a three year period. The suitable seed planting density required by the seeds of Z. marina in this method was also investigated. In the spring following seed distribution, seedling establishment rate of Z. marina subjected to different seed densities of 200-500seedsbag(-1) ranged from 16% to 26%. New eelgrass patches from seed were fully developed and well maintained after 2-3years following distribution. The seed planting density of 400seedsbag(-1) may be the most suitable for the establishment of new eelgrass patches. Our results demonstrate that seed-based restoration can be an effective restoration tool and the technique presented should be considered for future large-scale Z. marina restoration projects. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. A tale of two seagrasses: Comparing the science and management of Zostera marina and Zostera japonica in the Pacific Northwest

    Science.gov (United States)

    On the Pacific coast of North America, at least two congeners of Zostera occur: native Zostera marina, and introduced, Z. japonica. Z. japonica is considered “invasive” and therefore, ecologically and economically harmful by some, while others consider it benign or perhaps benef...

  17. Feeding by the heterotrophic dinoflagellate Oxyrrhis marina on the red-tide raphidophyte Heterosigma akashiwo: a potential biological method to control red tides using mass-cultured grazers.

    Science.gov (United States)

    Jeong, Hae Jin; Kim, Jae Seong; Yoo, Yeong Du; Kim, Seong Taek; Kim, Tae Hoon; Park, Myung Gil; Lee, Chang Hoon; Seong, Kyeong Ah; Kang, Nam Seon; Shim, Jae Hyung

    2003-01-01

    As part of the development of a method to control the outbreak and persistence of red tides using mass-cultured heterotrophic protist grazers, we measured the growth and ingestion rates of cultured Oxyrrhis marina (a heterotrophic dinoflagellate) on cultured Heterosigma akashiwo (a raphidophyte) in bottles in the laboratory and in mesocosms (ca. 60 liter) in nature, and those of the cultured grazer on natural populations of the red-tide organism in mesocosms set up in nature. In the bottle incubation, specific growth rates of O. marina increased rapidly with increasing concentration of cultured prey up to ca. 950 ng C ml(-1) (equivalent to 9,500 cells ml(-1)), but were saturated at higher concentrations. Maximum specific growth rate (mumax), KGR (prey concentration sustaining 0.5 mumax) and threshold prey concentration of O. marina on H. akashiwo were 1.43 d(-1), 104 ng C ml(-1), and 8.0 ng C ml(-1), respectively. Maximum ingestion and clearance rates of O. marina were 1.27 ng C grazer(-1) d(-1) and 0.3 microl grazer(-1) h(-1), respectively. Cultured O. marina grew well effectively reducing cultured and natural populations of H. akashiwo down to a very low concentration within 3 d in the mesocosms. The growth and ingestion rates of cultured O. marina on natural populations of H. akashiwo in the mesocosms were 39% and 40%, respectively, of those calculated based on the results from the bottle incubation in the laboratory, while growth and ingestion rates of cultured O. marina on cultured H. akashiwo in the mesocosms were 55% and 36%, respectively. Calculated grazing impact by O. marina on natural populations of H. akashiwo suggests that O. marina cultured on a large scale could be used for controlling red tides by H. akashiwo near aquaculture farms that are located in small ponds, lagoons, semi-enclosed bays, and large land-aqua tanks to which fresh seawater should be frequently supplied.

  18. The transcriptome of the novel dinoflagellate Oxyrrhis marina (Alveolata: Dinophyceae: response to salinity examined by 454 sequencing

    Directory of Open Access Journals (Sweden)

    Montagnes David JS

    2011-10-01

    Full Text Available Abstract Background The heterotrophic dinoflagellate Oxyrrhis marina is increasingly studied in experimental, ecological and evolutionary contexts. Its basal phylogenetic position within the dinoflagellates make O. marina useful for understanding the origin of numerous unusual features of the dinoflagellate lineage; its broad distribution has lent O. marina to the study of protist biogeography; and nutritive flexibility and eurytopy have made it a common lab rat for the investigation of physiological responses of marine heterotrophic flagellates. Nevertheless, genome-scale resources for O. marina are scarce. Here we present a 454-based transcriptome survey for this organism. In addition, we assess sequence read abundance, as a proxy for gene expression, in response to salinity, an environmental factor potentially important in determining O. marina spatial distributions. Results Sequencing generated ~57 Mbp of data which assembled into 7, 398 contigs. Approximately 24% of contigs were nominally identified by BLAST. A further clustering of contigs (at ≥ 90% identity revealed 164 transcript variant clusters, the largest of which (Phosphoribosylaminoimidazole-succinocarboxamide synthase was composed of 28 variants displaying predominately synonymous variation. In a genomic context, a sample of 5 different genes were demonstrated to occur as tandem repeats, separated by short (~200-340 bp inter-genic regions. For HSP90 several intergenic variants were detected suggesting a potentially complex genomic arrangement. In response to salinity, analysis of 454 read abundance highlighted 9 and 20 genes over or under expressed at 50 PSU, respectively. However, 454 read abundance and subsequent qPCR validation did not correlate well - suggesting that measures of gene expression via ad hoc analysis of sequence read abundance require careful interpretation. Conclusion Here we indicate that tandem gene arrangements and the occurrence of multiple transcribed

  19. La marina de guerra de la Corona de Castilla en la Baja Edad Media. Desde sus orígenes hasta el reinado de Enrique IV

    OpenAIRE

    García de Castro, Francisco Javier

    2012-01-01

    Nuestro estudio trazar las líneas históricas esenciales de la Marina de Guerra de Castilla desde sus inicios en el siglo XIII hasta finales del reinado de Enrique IV, cuando la llegada al trono de los Reyes Católicos abre una nueva etapa en el devenir de los reinos hispánicos. La tesis se estructura en siete apartados fundamentales: 1. Remotos orígenes previos a la creación de la Marina de Guerra. 2. El Almirantazgo, institución de referencia jurídica y económica de la Marina de Ca...

  20. Laboratory Culture of Oxyrrhis marina Dujardin%海洋尖尾藻的室内培养

    Institute of Scientific and Technical Information of China (English)

    安鑫龙; 李雪梅; 宫春光

    2012-01-01

    [目的]研究海洋尖尾藻(Oxrhis marina Dujardin)室内培养的可行性,为其生理生态特性及其赤潮形成机理的研究奠定基础.[方法]在实验室培养海洋尖尾藻,饵料藻为蛋白核小球藻(Chlorella pyrenoidosa)、湛江等鞭金藻(Isochrysis zhangjiangensis)、亚心形扁藻(Platymonas subcordiformis)和绿色巴夫藻(Pavlova viridis).[结果]在实验室条件下,除高密度的蛋白核小球藻和湛江等鞭金藻外,以亚心形扁藻和绿色巴夫藻作为饵料时海洋尖尾藻均能良好地生长和繁殖.[结论]该研究为海洋尖尾藻的室内培养解决了饵料问题,实现了海洋尖尾藻室内的长期培养.%[ Objective ] The research aimed to study the feasibility of laboratory culture of O. Marina Dujardin, to lay foundation for study of its physiological and ecological characteristics and formation mechanism of red tide. [ Method ] Food algae were Chlorella pyrenoidosa, Isochry-sis zhangjiangensis, Platymonas subcordiformis and Pavlova viridis. [ Result] Under the laboratory culture conditions, except of highly dense C. Pyrenoidosa and I. Zhangjiangensis, when P. Subcordiformis and P. Viridis were used as food algae, O. Marina Dujardin could develop and breed well. [ Conclusion ] The study can solve the problem of shortage of food algae when O. Marina Dujardin was cultured in laboratory, realizing the long-term culture of O. Marina Dujardin indoor.

  1. Avicennia marina

    African Journals Online (AJOL)

    SAM

    2014-04-23

    Apr 23, 2014 ... and tissue variability in plant dehydration responses is not as well investigated and understood .... embryonic axes was measured using a multi-cell conductivity meter ..... the sodium and potassium balance of the human heart.

  2. Aves Marinas

    OpenAIRE

    Sobrado-López, A.

    2012-01-01

    De forma amena y profusamente ilustrada se hace la historia de la evolución de las aves, anatomía, diversidad, migración y amenazas a la vida de este grupo zoológico. Se identifican los tratados y las convenciones que las protegen, así como qué cada persona puede hacer para ayudar. A través de los Sabías qué... resume lo más importante, curioso y atractivo de cada tópico abordado.

  3. Rezension zu: Marina Caffiero (Hg.: Rubare le anime. Roma: Viella 2008

    Directory of Open Access Journals (Sweden)

    Rita Unfer Lukoschik

    2009-07-01

    Full Text Available In den Akten des päpstlichen Staatsarchivs und der römischen jüdischen Gemeinde finden sich zeitgenössische Zeugnisse für die im päpstlichen Rom vom 16. bis zum 19. Jahrhundert nicht seltene Zwangskonvertierung jüdischer Mädchen und Frauen zum Katholizismus. Eines der wertvollsten Dokumente dieser Konversionspraxis liegt nunmehr in einer kommentierten Neuedition vor: das Tagebuch der 1749 sich erfolgreich der versuchten Zwangskonvertierung widersetzenden 18-jährigen Anna del Monte. In ihrer Einleitung ordnet die Herausgeberin Marina Caffiero dieses außergewöhliche Einzelschicksal in die zeitgleich und parallel laufenden Assimilations- und Emanzipationsprozesse ein, die sich in der mit aufklärerischem Gedankengut ‚infizierten‘ jüdischen Oberschicht Roms im 18. Jahrhundert abzeichneten.

  4. Effects of algae-mat thickness on survival and growth of eelgrass (Zostera marina) seedlings

    DEFF Research Database (Denmark)

    Rasmussen, Jonas; Olesen, Birgit

    . For eelgrass even short periods of water column anoxia may have severe implications for growth and survival. In addition, excessive covering by macroalgal mats decrease the available light at leaf surface and may hamper the diffusive movement of oxygen, inorganic carbon and nutrients to and from the shoot thus......: Chaetomorpha linum and artificial macroalgae. The two types of mats were used to separate physical and metabolic effects of algal presence. During the growth period concentrations of oxygen and sulphide and their diurnal variations in the mats were measured using microelectrodes.......A major bottle-neck for eelgrass (Zostera marina) re-colonization is seedling survival and patch establishment as mortality rates among the young seedlings are high even in areas where light conditions and physical exposure should support survival. Since little is known about the reasons...

  5. Screening of antifouling biocides around a pleasure boat marina in the Baltic Sea after legal restrictions.

    Science.gov (United States)

    Kylin, Henrik; Haglund, Kurt

    2010-10-01

    Copper, zinc, and Irgarol 1051 concentrations were determined around a pleasure boat marina in the Stockholm Archipelago. Copper concentrations in water were twice as high (6.62 μg L⁻¹) in 2004 as 1992-1993, zinc concentrations six times higher (20.0 μg L⁻¹). Concentrations in bladder wrack (Fucus vesiculosus) had also risen. Irgarol concentrations in water were similar (~0.17 μg L⁻¹) in 1996 and 2004, while concentrations in bladder wrack halved from 1993 to 2004. The peak concentrations of copper and Irgarol in water have shifted indicating that the main source in the 1990 s were local boats, but in 2004 visiting boats.

  6. Linking Arenicola marina irrigation behavior to oxygen transport and dynamics in sandy sediments

    DEFF Research Database (Denmark)

    Timmermann, Karen; Banta, Gary T.; Glud, Ronnie Nøhr

    2007-01-01

    In this study we examine how the irrigation behavior of the common lugworm Arenicola marina affects the distribution, transport and dynamics of oxygen in sediments using microelectrodes, planar optodes and diagenetic modeling. The irrigation pattern was characterized by a regular recurring periods...... mediated oxygen uptake of the burrow wall. Approximately 28% of the oxygen was consumed by the feeding pocket/funnel characterized by advective porewater transport. Model simulations indicated that oxygen injected into the sediment was usually consumed in a very narrow zone around the feeding pocket...... concentration in the burrow was high (80% air saturation) and oxygen was detected at distances up to 0.7 mm from the burrow wall. Volume specific oxygen consumption rates calculated from measured oxygen profiles were up to 4 times higher for sediments surrounding worm burrows as compared to surface sediments...

  7. Synergistic effects of altered salinity and temperature on estuarine eelgrass (Zostera marina) seedlings and clonal shoots

    DEFF Research Database (Denmark)

    Salo, Tiina Elina; Pedersen, Morten Foldager

    2014-01-01

    Salinity and temperature are among the most important factors determining eelgrass distribution and performance. Plants in estuarine environments experience large variations in both on a seasonal basis and exceptionally warm summers have caused massive die-backs of eelgrass in many areas. We...... investigated experimentally how different combinations of salinity and temperature affect the physiological performance of adult eelgrass (Zostera marina) shoots and seedlings. Plants were exposed to different combinations of salinity (salinity 5, 12.5 and 20) and temperature (15, 20 and 25 °C) in a 5-week...... aquarium experiment. Plants responded in general negatively to decreasing salinity and increasing temperature and the combination of high temperature and low salinity resulted in markedly higher mortality rates and lower leaf production when compared to plants held at more optimal combinations of salinity...

  8. Photovoltaic DER System Could Save USPS $25,000 per Year in Marina del Rey, California

    Energy Technology Data Exchange (ETDEWEB)

    2002-11-01

    In numerous projects, government agencies are demonstrating the economic and environmental value of using distributed energy resources (DER) to provide reliable electricity for Federal facilities. These projects also show how renewable DER systems such as photovoltaics (PV) can be effectively integrated into utility power grids to provide added power during peak demand periods in populous regions and states. This four-page case study describes a recent project in which the United States Postal Service (USPS) worked with the U.S. Department of Energy (DOE) Federal Energy Management Program (FEMP), a national laboratory, the local utility, and a private company to install a PV DER system at the USPS Marina Processing and Distribution Center in Inglewood, California. This system is expected to shave 10% off the facility's 1.2-megawatt peak power demand and save more $25,000 per year in utility costs.

  9. Photosynthetic carbon fixation pathways in Zostera marina and three Florida seagrasses

    Energy Technology Data Exchange (ETDEWEB)

    Beer, S.; Wetzel, R.G.

    1982-06-01

    The photosynthetic carbon fixation pathways of four seagrass species, Zostera marina L. from Alaska and Thalassia testudinum Banks ex Konig, Syringodium filiforme Kutz. and Halodule wrightii Aschers. from the Gulf of Mexico, were investigated with a /sup 14/C pulse-chase technique. All species were found to be principally of the C/sub 3/ type. However, Thalassia and Halodule had higher initial incorporation rates into organic acids than is typical for terrestrial C/sub 3/ plants. Of 11 seagrass species investigated thus far for C/sub 3/ or C/sub 4/ metabolism using this technique, 10 were found to be principally of the C/sub 3/ type while only one exhibited C/sub 4/ metabolism.

  10. Genotype-specific responses to light stress in eelgrass Zostera marina, a marine foundation plant

    DEFF Research Database (Denmark)

    Salo, Tiina Elina; Reusch, Thorsten B. H.

    2015-01-01

    Within mono-specific meadows of clonal plants, genotypic diversity may functionally replace species diversity. Little is known about the variability in performance and plasticity of different genotypes towards anthropogenically induced stressors. In this field experiment we compared light......-limitation stress responses and recovery of different eelgrass Zostera marina genotypes to assess the variability in phenotypic plasticity and gene expression between different genotypes. Replicated monoculture plots of 4 genotypes were subjected to a simulated turbidity period of 4 wk using shading screens...... remarkable plasticity in their stress responses and all phenotypic variables recovered to the control level within 4 wk. Depletion and subsequent restoration of sucrose levels differed among genotypes. In terms of gene expression, no consistent patterns were observed. Our study confirms that stress responses...

  11. Sediment accumulation and mercury (Hg) flux in Avicennia marina forest of Deep Bay, China

    Science.gov (United States)

    Li, Ruili; Chai, Minwei; Guo, Meixian; Qiu, Guo Yu

    2016-08-01

    To investigate the rate of sediment accumulation and mercury (Hg) flux in Avicennia marina forest of Deep Bay, China, sediment cores were analyzed. The results showed that Hg concentrations were much higher at all depths compared to the background level. A high correlation between Hg and total organic carbon (TOC) indicated their similar anthropogenic origin. Sedimentation rate was estimated to be 1.38 cm a-1 by 210Pb geochronology. The increase in the mass sediment accumulation rates was rapid (range: 0.5-0.94 g cm-2 a-1), and the Hg fluxes ranged between 76 and 116 ng cm-2 a-1 during the last three decades. The reduction in both Hg concentrations and flux during the last decade may be due to the adoption of contamination control policies. Our results support the notion that the Hg fluxes determined from the sediment cores reveal the effects of anthropogenic influences from the areas around Deep Bay.

  12. Esteróles Libres Monohidroxilados De La Esponja Marina Agelas schmidti (Wilson, 1902

    Directory of Open Access Journals (Sweden)

    Carmenza Duque

    2010-09-01

    Full Text Available De la esponja marina Ágelas schmidti recolectada en la bahía de Santa Marta (Caribe Colombiano, se aisló por cromatografía en columna sobre silica gel la fracción esterólica. Los esteróles presentes en esta fracción fueron sometidos a Cromatografía Líquida de Alta Eficiencia preparativa en fase reversa y analizados por Cromatografía de Gases de Alta Resolución y Cromatografía de Gases de Alta Resolución acoplada a Espectrometría de Masas. De dieciocho esteróles separados, diecisiete fueron identificados presentando la mayoría de ellos núcleos A" y A' con cadenas laterales convencionales.

  13. Photoacclimatory Responses of Zostera marina in the Intertidal and Subtidal Zones.

    Directory of Open Access Journals (Sweden)

    Sang Rul Park

    Full Text Available Photoacclimatory responses of the seagrass Zostera marina in the intertidal and subtidal zones were investigated by measuring chlorophyll a fluorescence parameters, photosynthetic pigments, leaf δ13C values, and shoot morphology in two bay systems. Intertidal plants had higher carotenoid concentrations than subtidal plants to avoid photodamage under excess light conditions during the day. The maximum relative electron transport rate (rETRmax and minimum saturation irradiance (Ek of the intertidal plants were higher than those of the subtidal plants, whereas photosynthetic efficiency (α and maximum quantum yield (Fv/Fm were higher in subtidal plants. The intertidal plants also had significantly greater Stern-Volmer non-photochemical quenching (NPQ than that of the subtidal plants. These results suggest that the subtidal plants photoacclimated to use limited light more efficiently, and the intertidal plants exhibited photosynthetic responses to minimize photodamage at excess irradiance. The δ13C values of leaf tissues were more negative in the intertidal plants than those in the subtidal plants, suggesting that the intertidal plants used atmospheric or dissolved CO2 for photosynthesis during emersion. Effective quantum yield (ΔF/Fm´ in the intertidal plants decreased more slowly after emersion than that in the subtidal plants, indicating higher desiccation tolerance of the intertidal plants. The intertidal plants also recovered more rapidly from desiccation damage than the subtidal plants, suggesting photosynthetic adaptation to desiccation stress. The photosynthetic plasticity of Z. marina in response to variable environmental conditions most likely allows this species to occur in the intertidal and subtidal zones.

  14. Antibacterial potential of biosynthesised silver nanoparticles using Avicennia marina mangrove plant

    Science.gov (United States)

    Gnanadesigan, M.; Anand, M.; Ravikumar, S.; Maruthupandy, M.; Syed Ali, M.; Vijayakumar, V.; Kumaraguru, A. K.

    2012-06-01

    The present study was aimed to identify the antibacterial potential of biosynthesised silver nanoparticles using different plant parts (leaves, bark and root) of Avicenna marina mangrove plant. Of the selected three different parts, the leaf extract showed the maximum synthesis of silver nanoparticles. The in vitro antibacterial assay (100 μg disk-1 concentration) showed the results of maximum zone of inhibition with the E. coli (18.40 ± 0.97 mm), and minimum (10.87 ± 1.33 mm) zone of inhibition with S. aureus but the concentrations of MIC and MBC values ranged between 6.25 and 50.0 μg ml-1 between the selected bacterial strains. The FTIR results of most potent leaf extract-synthesized silver nanoparticles showed the prominent peaks (620.967; 1,061.02; 1,116.58; 1,187.94; 1,280.50; 1,353.79; 1,384.64; 1,598.50; 1,629.56; 2,854.14 and 2,927.42) in different ranges. Further, the results of XRD analysis showed the 2 θ intense values (38.11 and 70.57) within the ranges of Bragg's reflection. In addition, the AFM analysis showed the results of particle sizes (71-110 nm), particle roughness (11.8 nm), maximum height of the particle roughness (111.8 nm), and average maximum height of the particle roughness (57.5 nm). It can be concluded from the present findings that, the biosynthesis of silver nanoparticles from the leaf extract of A. marina can be used as potential antibacterial agents.

  15. Sport and Tourism: a potentially conflictual relationship. The case of Marinas in Tenerife

    Directory of Open Access Journals (Sweden)

    Manuel Eduardo González Ramallal

    2010-01-01

    Full Text Available El artículo se centra en los conflictos que pueden surgir en el ámbito del deporte y el turismo partiendo del estudio de un caso centrado en dos puertos deportivos de la isla de Tenerife (España. A través de una aproximación cualitativa, se analizó el discurso de los participantes en siete actividades deportivas marinas diferentes. Frente a la tradicional visión optimista en torno a la relación entre deporte y turismo, los resultados de la investigación muestran que pueden surgir conflictos si ésta no se gestiona adecuadamente. Los conflictos pueden darse a tres niveles. En primer lugar, a nivel de práctica deportiva, donde los problemas pueden surgir entre las diferentes actividades deportivas que se dan en torno a los puertos deportivos. En segundo lugar, entre los diferentes grupos sociales que usan los puertos deportivos. En tercer lugar, a nivel turístico, los conflictos pueden surgir entre el modelo de desarrollo turístico y el uso que se le da a las marinas como espacios deportivos. El artículo concluye enfatizando las cuestiones clave a considerar para gestionar adecuadamente la relación deporte y turismo, tales como las de la imagen de marca asociada tanto a los deportes como a los destinos turísticos, así como los grupos sociales que habitualmente practican un deporte o visitan un destino.

  16. Photoacclimatory Responses of Zostera marina in the Intertidal and Subtidal Zones

    Science.gov (United States)

    Park, Sang Rul; Kim, Sangil; Kim, Young Kyun; Kang, Chang-Keun; Lee, Kun-Seop

    2016-01-01

    Photoacclimatory responses of the seagrass Zostera marina in the intertidal and subtidal zones were investigated by measuring chlorophyll a fluorescence parameters, photosynthetic pigments, leaf δ13C values, and shoot morphology in two bay systems. Intertidal plants had higher carotenoid concentrations than subtidal plants to avoid photodamage under excess light conditions during the day. The maximum relative electron transport rate (rETRmax) and minimum saturation irradiance (Ek) of the intertidal plants were higher than those of the subtidal plants, whereas photosynthetic efficiency (α) and maximum quantum yield (Fv/Fm) were higher in subtidal plants. The intertidal plants also had significantly greater Stern–Volmer non-photochemical quenching (NPQ) than that of the subtidal plants. These results suggest that the subtidal plants photoacclimated to use limited light more efficiently, and the intertidal plants exhibited photosynthetic responses to minimize photodamage at excess irradiance. The δ13C values of leaf tissues were more negative in the intertidal plants than those in the subtidal plants, suggesting that the intertidal plants used atmospheric or dissolved CO2 for photosynthesis during emersion. Effective quantum yield (ΔF/Fm´) in the intertidal plants decreased more slowly after emersion than that in the subtidal plants, indicating higher desiccation tolerance of the intertidal plants. The intertidal plants also recovered more rapidly from desiccation damage than the subtidal plants, suggesting photosynthetic adaptation to desiccation stress. The photosynthetic plasticity of Z. marina in response to variable environmental conditions most likely allows this species to occur in the intertidal and subtidal zones. PMID:27227327

  17. Orígenes familiares y carrera profesional de Julián de Arriaga, Secretario de Estado de Marina e Indias (1700-1776

    Directory of Open Access Journals (Sweden)

    María Baudot Monroy

    2004-01-01

    Full Text Available La Secretaria de Marina surgida de las reformas administrativas de Felipe V con la finalidad de ocuparse específicamente de los asuntos de la Marina, fue dirigida durante el siglo xviii por diez y seis secretarios de Estado de Marina. Actualmente sólo contamos con estudios solventes sobre aquellos cuya gestión reformadora de la Marina destacó sobre la de los demás. Julián de Arriaga fue uno de los secretarios de Marina de los que apenas conocíamos unos rasgos. Este trabajo nos acerca al tiombre que fue y a su familia, y da a conocer su carrera como marino de guerra, desarrollada durante la primera mitad del siglo, antes de acceder a la cartera de Marina. One of the reforms that king Philip V did to modernice the Spanish administration was to create a ministry for the Navy. During the 18th century this ministry had sixteen different ministers. For the moment we know only the biography of the most outstanding ministers, those who did fundamental reforms for the Spanish Navy. Julián de Arriaga is one of the ministers of the Navy of whom we know only some few characteristics. This article deals with his family and his career as a naval oficer before his promotion to the ministry in 1754.

  18. Marine Isolates of Trimastix marina Form a Plesiomorphic Deep-branching Lineage within Preaxostyla, Separate from Other Known Trimastigids (Paratrimastix n. gen.).

    Science.gov (United States)

    Zhang, Qianqian; Táborský, Petr; Silberman, Jeffrey D; Pánek, Tomáš; Čepička, Ivan; Simpson, Alastair G B

    2015-09-01

    Trimastigids are free-living, anaerobic protists that are closely related to the symbiotic oxymonads, forming together the taxon Preaxostyla (Excavata: Metamonada). We isolated fourteen new strains morphologically corresponding to two species assigned to Trimastix (until now the only genus of trimastigids), Trimastix marina and Trimastix pyriformis. Unexpectedly, marine strains of Trimastix marina branch separately from freshwater strains of this morphospecies in SSU rRNA gene trees, and instead form the sister group of all other Preaxostyla. This position is confirmed by three-gene phylogenies. Ultrastructural examination of a marine isolate of Trimastix marina demonstrates a combination of trimastigid-like features (e.g. preaxostyle-like I fibre) and ancestral characters (e.g. absence of thickened flagellar vane margins), consistent with inclusion of marine T. marina within Preaxostyla, but also supporting its distinctiveness from 'freshwater T. marina' and its deep-branching position within Preaxostyla. Since these results indicate paraphyly of Trimastix as currently understood, we transfer the other better-studied trimastigids to Paratrimastix n. gen. and Paratrimastigidae n. fam. The freshwater form previously identified as T. marina is described as Paratrimastix eleionoma n. sp., and Trimastix pyriformis becomes Paratrimastix pyriformis n. comb. Because of its phylogenetic position, 'true' Trimastix is potentially important for understanding the evolution of mitochondrion-related organelles in metamonads.

  19. Changes of plasma membrane ATPase activity,membrane potential and transmembrane proton gradient in Kandelia candel and Avicennia marina seedlings with various salinities

    Institute of Scientific and Technical Information of China (English)

    ZHAO Zhong-qiu; ZHENG Hai-lei; ZHU Yong-guan

    2004-01-01

    The salt-secreting mangrove, Avicennia marina, and non-salt-secreting mangrove, Kandelia candel were cultivated in sand with various salinities(0 ‰, 10 ‰, 20 ‰, 30 ‰, 40 ‰) for 60 d. Plasma membrane vesicles of high-purity in leaves and roots of A.marina and K. candel seedlings were obtained by two-phase partitioning. The function of the plasma membranes, the activity of ATPase, membrane potential and transmembrane proton gradient, at various salinities were investigated. The results showed that within a certain range of salinity(A. marina and roots of K. candel: 0-30‰;leaves of K.candel: 0-20‰), the activity of ATPase increased with increasing salinity, while high salinity(above 30‰ or 20‰) inhibited ATPase activity. In comparison with A. marina, K. candel appeared to be more sensitive to salinity. The dynamics of membrane potential and transmembrane proton gradient in leaves and roots of A. marina and K. candel seedlings were similar to that of ATPase. When treated directly by NaCl all the indexes were inhibited markedly: there was a little increase within 0-10‰(K. candel) or 0-20‰(A. marina) followed by sharp declining. It indicated that the structure and function of plasma membrane was damaged severely.

  20. 瑞典沿岸水域濒临消失的大叶藻(Zostera Marina,L.)%Vanishing Seagrass (Zostera marina, L.) in Swedish Coastal Waters

    Institute of Scientific and Technical Information of China (English)

    Susanne Baden; Martin Gullstr(o)m; Bengt Lundén; Leif Pihl; Rutger Rosenberg

    2003-01-01

    在瑞典斯卡格拉克海峡沿岸,大叶藻(Zostera marina)是一种生长在浅水软海底上的优势显花植物.大叶藻场是许多甲壳动物和鱼类,不管是洄游种或是稳定种的重要群落生境.在20世纪80年代期间,作为海岸带管理的基础,对瑞典西海岸有大叶藻生长的沿岸浅水区的资源进行了调查.在这次研究中我们再次考察了斯卡格拉克海峡200km沿岸的5个沿海地区中的2000hm2大叶藻场.资源调查的方法(水下测量镜)与80年代的一样,但通过使用全球定位系统(GPS)增加了绘图的精确度.这次研究的结果表明,在10~15年的时间里,大叶藻的区域延伸面积减少了58%,且地区变化很大.大叶藻的减少主要限于大叶藻场的浅水部分.本文探讨了原因和生态后果.

  1. Phytophthora gemini sp. nov., a new species isolated from the halophilic plant Zostera marina in the Netherlands.

    Science.gov (United States)

    Man in 't Veld, Willem A; Rosendahl, Karin C H M; Brouwer, Henk; de Cock, Arthur W A M

    2011-08-01

    Eight strains belonging to the Oomycete genus Phytophthora were isolated from Zostera marina (seagrass) in The Netherlands over the past 25 y. Based on morphology, isozymes, temperature-growth relationships and ITS sequences, these strains were found to belong to two different Phytophthora species. Five strains, four of them isolated from rotting seeds and one isolated from decaying plants, could not be assigned to a known species and hence belong to a new species for which we propose the name Phytophthora gemini sp. nov. Three strains were isolated from decaying plants and were identified as Phytophthora inundata, thereby expanding the known habitat range of this species from fresh to brackish-saline areas. The possible role of both Phytophthora species in the decline of Z. marina in The Netherlands and the evolutionary significance of the presence of Phytophthora species in marine environments are discussed.

  2. [Marina de Vasconcellos and the social sciences in Rio de Janeiro: a study of the social circles].

    Science.gov (United States)

    Ribeiro, Adelia Maria Miglievich

    2008-06-01

    An investigation of the career of one of the "founding mothers" of the social sciences in Rio de Janeiro, Marina de Vasconcellos, successor of Arthur Ramos, is one way of understanding how anthropology was established in Rio de Janeiro. Conflicts and alliances, continuities and discontinuities, lie behind the pioneering Brazilian Society of Anthropology and Ethnology and the Institute of Social Sciences, both at Faculdade Nacional de Filosofia. Marina de Vasconcellos' professional life bore the marks of the clash between different schools of thought regarding anthropology at a time when university courses were being introduced. As a professor, she was committed to educating new professionals, and in 1968, she was steadfast in the struggle for university autonomy. The study leads to a reflection upon the criteria for success in academia, countering the view that this depends entirely on the publication of books and articles.

  3. Structure, Aboveground Biomass, and Soil Characterization of Avicennia marina in Eastern Mangrove Lagoon National Park, Abu Dhabi

    Science.gov (United States)

    Alsumaiti, Tareefa Saad Sultan

    Mangrove forests are national treasures of the United Arab Emirates (UAE) and other arid countries with limited forested areas. Mangroves form a crucial part of the coastal ecosystem and provide numerous benefits to society, economy, and especially the environment. Mangrove trees, specifically Avicennia marina, are studied in their native habitat in order to characterize their population structure, aboveground biomass, and soil properties. This study focused on Eastern Mangrove Lagoon National Park in Abu Dhabi, which was the first mangrove protected area to be designated in UAE. In situ measurements were collected to estimate Avicennia marina status, mortality rate (%), height (m), crown spread (m), stem number, diameter at breast height (cm), basal area (m), and aboveground biomass (t ha-1 ). Small-footprint aerial light detection and ranging (LIDAR) data acquired by UAE were processed to characterize mangrove canopy height and aboveground biomass density. This included extraction of LIDAR-derived height percentile statistics, segmentation of the forest into structurally homogenous units, and development of regression relationships between in situ reference and remote sensing data using a machine learning approach. An in situ soil survey was conducted to examine the soils' physical and chemical properties, fertility status, and organic matter. The data of soil survey were used to create soil maps to evaluate key characteristics of soils, and their influence on Avicennia marina in Eastern Mangrove Lagoon National Park. The results of this study provide new insights into Avicennia marina canopy population, structure, aboveground biomass, and soil properties in Abu Dhabi, as data in such arid environments is lacking. This valuable information can help in managing and preserving this unique ecosystem.

  4. High-quality draft genome sequence of Kocuria marina SO9-6, an actinobacterium isolated from a copper mine

    Science.gov (United States)

    Castro, Daniel B.A.; Pereira, Letícia Bianca; Silva, Marcus Vinícius M. e; Silva, Bárbara P. da; Palermo, Bruna Rafaella Z.; Carlos, Camila; Belgini, Daiane R.B.; Limache, Elmer Erasmo G.; Lacerda, Gileno V. Jr; Nery, Mariana B.P.; Gomes, Milene B.; Souza, Salatiel S. de; Silva, Thiago M. da; Rodrigues, Viviane D.; Paulino, Luciana C.; Vicentini, Renato; Ferraz, Lúcio F.C.; Ottoboni, Laura M.M.

    2015-01-01

    An actinobacterial strain, designated SO9-6, was isolated from a copper iron sulfide mineral. The organism is Gram-positive, facultatively anaerobic, and coccoid. Chemotaxonomic and phylogenetic properties were consistent with its classification in the genus Kocuria. Here, we report the first draft genome sequence of Kocuria marina SO9-6 under accession JROM00000000 (http://www.ncbi.nlm.nih.gov/nuccore/725823918), which provides insights for heavy metal bioremediation and production of compounds of biotechnological interest. PMID:26484219

  5. Isolation of antibacterials from the mangrove, Avicennia marina and their activity against multi drug resistant Staphylococcus aureus

    Institute of Scientific and Technical Information of China (English)

    N.B.Dhayanithi; T. T. Ajith Kumar; R. Ganesha Murthy; K. Kathiresan

    2012-01-01

    Objective: leaf extract of A. marina was tested on the growth of clinically isolated multi-drug resistant Staphylococcus aureus and its bioactive compounds were attempted. Method: Clinical strain of Staphylococcus aureus, were isolated from sputum, pus and blood of different patients and 22 strains were screened for antibiotic susceptibility. Avicennia marina was extracted in different solvents and antibacterial assay was carried out using Kirby-Bauer’s disk diffusion method. Crude methanol extract of the mangrove was loaded on a silica gel column and eluted with chloroform and methanol (9:1 to 1:9) followed by ethyl acetate and methanol (9:1 to 1:9). Based on in vitro assay, the 12th fraction was subjected for minimum inhibitory concentration (MIC). The active fraction was analysed by using a Clarus 500 Perkin Elmer gas chromatography. Result: Based on the antibiotic susceptibility test, six strains (RMSA 6, RMSA12, RMSA16, RMSA18, RMSA19 and RMSA21) were resistance against methicillin, vancomycin and ciprofloxacin. The results indicated that the methanolic leaf extract showed the highest antibacterial activity against all the tested strains RMSA 6 (16mm), RMSA12 (15 mm), RMSA16 (13 mm), RMSA18 (10 mm), RMSA19 (17 mm) and RMSA21 (16 mm). The MIC of the partially purified extract showed potential results against all the multidrug resistant strains however, the lowest concentration was recorded against RMSA 6, RMSA19 and RMSA21 strain. In the GC-MS results, 5 bioactive compounds were identified from the partially purified extract of A.marina. Conclusion:The methanolic extract of A. marina has the more potential candidate to inhibit against multidrug resistant S. aureus.

  6. Análisis preliminar de la estructura primaria y secundaria del ARNtTrp en tortugas marinas

    Directory of Open Access Journals (Sweden)

    Harvey Infante-Rojas

    2015-06-01

    Full Text Available Actualmente existen siete especies de tortugas marinas, todas amenazadas o en riesgo inminente de extinción. Los estudios con ADN mitocondrial han permitido hacer acercamientos sobre filogenia, evolución, rutas migratorias y centros de dispersión, además para la identificación de polimorfismos y haplotipos, siendo base para planes de manejo y conservación. El presente estudio representa la primera descripción comparada de la estructura primaria y secundaria del ARNtTrp mitocondrial en tortugas marinas. Se realizó un alineamiento múltiple de 26 secuencias del gen que codifica para el ARNtTrp y se propuso la estructura secundaria utilizando el programa ARWEN. Se identificaron potenciales interacciones terciarias por homología comparada con el ARNtTrp de mamíferos. Los resultados mostraron una secuencia consenso de 76 bases con siete regiones conservadas que representan el 76 % de la molécula. Se identificaron polimorfismos que representan tres haplotipos para C. caretta, dos para C. mydas y uno para cada una de las demás especies. Las estructuras secundarias mostraron cambios nucleotídicos puntuales para cada especie y también mostraron que el tallo aceptor, el brazo TψC y el bucle anticodón son motivos conservados en el ARNtTrp de las tortugas marinas. Se encontró un enlace no canónico tipo A-A en el tallo DHU que podría considerarse característico de tortugas marinas. Además, se obtuvo una estructura secundaria consenso en donde se identificaron las siete regiones conservadas, seis posibles interacciones terciarias y el bucle DHU como región variable.

  7. Bioaccumulation and distribution of metals in sediments and Avicenna marina tissues in the Hara Biosphere Reserve, Iran.

    Science.gov (United States)

    Nowrouzi, Mohsen; Pourkhabbaz, Alireza; Rezaei, Mohammadreza

    2012-10-01

    The metal pollution in Sediments and Avicenna marina tissues in the Hara Biosphere Reserve was monitored for Lead (Pb), Cadmium (Cd), and Nickel (Ni) with atomic absorption spectrometer. The results showed that the mean concentration of Pb, Cd, and Ni in the water and sediments were much higher than the recommended threshold limits in the most stations, also the highest means of Pb, Cd, and Ni were observed in Avicenna roots and it were 25.26 ± 4.86, 2.17 ± 0.74, and 26.72 ± 6.17 (μg g(-1)) respectively. Calculating BCF (bioconcentration factor) index illustrates that A. marina accumulates Pb, Cd, and Ni 1.62, 1.52 and 0.73 times greater than sediment levels respectively, So it can show that A. marina may be employed as a biological indicator exposure of Cd, Pb, and Ni with temporal monitoring, also the factories were main sources of metals contamination in the Hara Biosphere Reserve.

  8. In vitro antibacterial activity and stability of Avicennia marina against urinary tract infection pathogens at different parameters.

    Science.gov (United States)

    Devi, A Sheela; Rajkumar, Johanna

    2013-10-01

    In this study midstream urine samples were collected from urinary tract infected patients to isolate and identify UTI causing bacterial pathogens by biochemical methods. The identified strains were two gram-positive and five gram-negative bacterium. Out of these we have selected one gram-negative (Staphylococcus aureus) and three gram-positive (Escherichia coli, Pseudomonas aeruginosa and Klebsiella pneumoniae) bacteria for current study. The antibacterial effect of aqueous, hexane, chloroform, ethyl acetate and methanol extracts of Avicennia marina against UTI pathogens were studied. Most effective three extracts of A. marina were treated with charcoal. Out of three extracts methanol was confirmed as tremendous to act against bacterial isolates and it was characterized at two different concentrations and compared with chemical based antibiotics. The stability and antimicrobial efficacy of the extract of A. marina in different parameters such as temperature, pH, enzyme, surfactant, organic solvent was determined. In summary, the extract showed an excellent stability and effectiveness to temperature 50 degrees C, pH 4, enzyme treatment using protease, surfactant (EDTA) and organic solvent (formaldehyde).

  9. Annual variation of biomass and photosynthesis in Zostera marina L. along the Pacific Coast of Baja California, Mexico

    Science.gov (United States)

    Cabello-Pasini, Alejandro; Munoz-Salazar, R.; Ward, D.H.

    2003-01-01

    Density, biomass, morphology, phenology and photosynthetic characteristics of Zostera marina were related to continuous measurements of in situ irradiance, attenuation coefficient and temperature at three coastal lagoons in Baja California, Mexico. In situ irradiance was approximately two-fold lower at San Quintin Bay (SQ) than at Ojo de Liebre Lagoon (OL) and San Ignacio Lagoon (SI). As a consequence of the greater irradiance plants at OL and SI were established 1 m deeper within the water column than those at SQ. At SQ, there was a four-fold variation in biomass of Z. marina caused by changes on shoot length and not shoot density, while at OL and SI biomass and shoot length did not fluctuate significantly throughout the year. Reproductive shoot density reached maximum values concomitantly with the greater irradiance during spring-summer, however, the density was approximately three-fold greater at SQ than at the southern coastal lagoons. While irradiance levels were two-fold greater at the southern lagoons, in general, photosynthetic characteristics were similar among all three lagoons. The hours of light saturated photosynthesis, calculated from their photosynthetic characteristics and irradiance measurements, suggest that photosynthesis of shoots from OL and SI are saturated for more than 6 h per day throughout the year, while shoots from SQ are likely light limited during approximately 15% of the year. Consequently, an increase in attenuation coefficient values in the water column will likely decrease light availability to Z. marina plants at SQ, potentially decreasing their survival.

  10. Effects of conventional and biodegradable microplastics on a marine ecosystem engineer (Arenicola marina) and sediment nutrient cycling.

    Science.gov (United States)

    Green, Dannielle Senga; Boots, Bas; Sigwart, Julia; Jiang, Shan; Rocha, Carlos

    2016-01-01

    Effects of microplastic pollution on benthic organisms and ecosystem services provided by sedimentary habitats are largely unknown. An outdoor mesocosm experiment was done to realistically assess the effects of three different types of microplastic pollution (one biodegradable type; polylactic acid and two conventional types; polyethylene and polyvinylchloride) at increasing concentrations (0.02, 0.2 and 2% of wet sediment weight) on the health and biological activity of lugworms, Arenicola marina (Linnaeus, 1758), and on nitrogen cycling and primary productivity of the sediment they inhabit. After 31 days, A. marina produced less casts in sediments containing microplastics. Metabolic rates of A. marina increased, while microalgal biomass decreased at high concentrations, compared to sediments with low concentrations or without microplastics. Responses were strongest to polyvinylchloride, emphasising that different materials may have differential effects. Each material needs to be carefully evaluated in order to assess their risks as microplastic pollution. Overall, both conventional and biodegradable microplastics in sandy sediments can affect the health and behaviour of lugworms and directly or indirectly reduce primary productivity of these habitats.

  11. Texture and composition of the Rosa Marina beach sands (Adriatic coast, southern Italy: a sedimentological/ecological approach

    Directory of Open Access Journals (Sweden)

    Moretti Massimo

    2016-06-01

    Full Text Available Beach sands from the Rosa Marina locality (Adriatic coast, southern Italy were analysed mainly microscopically in order to trace the source areas of their lithoclastic and bioclastic components. The main cropping out sedimentary units were also studied with the objective to identify the potential source areas of lithoclasts. This allowed to establish how the various rock units contribute to the formation of beach sands. The analysis of the bioclastic components allows to estimate the actual role of organisms regarding the supply of this material to the beach. Identification of taxa that are present in the beach sands as shell fragments or other remains was carried out at the genus or family level. Ecological investigation of the same beach and the recognition of sub-environments (mainly distinguished on the basis of the nature of the substrate and of the water depth was the key topic that allowed to establish the actual source areas of bioclasts in the Rosa Marina beach sands. The sedimentological analysis (including a physical study of the beach and the calculation of some statistical parameters concerning the grain-size curves shows that the Rosa Marina beach is nowadays subject to erosion.

  12. The MARINA model (Model to Assess River Inputs of Nutrients to seAs): Model description and results for China.

    Science.gov (United States)

    Strokal, Maryna; Kroeze, Carolien; Wang, Mengru; Bai, Zhaohai; Ma, Lin

    2016-08-15

    Chinese agriculture has been developing fast towards industrial food production systems that discharge nutrient-rich wastewater into rivers. As a result, nutrient export by rivers has been increasing, resulting in coastal water pollution. We developed a Model to Assess River Inputs of Nutrients to seAs (MARINA) for China. The MARINA Nutrient Model quantifies river export of nutrients by source at the sub-basin scale as a function of human activities on land. MARINA is a downscaled version for China of the Global NEWS-2 (Nutrient Export from WaterSheds) model with an improved approach for nutrient losses from animal production and population. We use the model to quantify dissolved inorganic and organic nitrogen (N) and phosphorus (P) export by six large rivers draining into the Bohai Gulf (Yellow, Hai, Liao), Yellow Sea (Yangtze, Huai) and South China Sea (Pearl) in 1970, 2000 and 2050. We addressed uncertainties in the MARINA Nutrient model. Between 1970 and 2000 river export of dissolved N and P increased by a factor of 2-8 depending on sea and nutrient form. Thus, the risk for coastal eutrophication increased. Direct losses of manure to rivers contribute to 60-78% of nutrient inputs to the Bohai Gulf and 20-74% of nutrient inputs to the other seas in 2000. Sewage is an important source of dissolved inorganic P, and synthetic fertilizers of dissolved inorganic N. Over half of the nutrients exported by the Yangtze and Pearl rivers originated from human activities in downstream and middlestream sub-basins. The Yellow River exported up to 70% of dissolved inorganic N and P from downstream sub-basins and of dissolved organic N and P from middlestream sub-basins. Rivers draining into the Bohai Gulf are drier, and thus transport fewer nutrients. For the future we calculate further increases in river export of nutrients. The MARINA Nutrient model quantifies the main sources of coastal water pollution for sub-basins. This information can contribute to formulation of

  13. Larger body size at metamorphosis enhances survival, growth and performance of young cane toads (Rhinella marina.

    Directory of Open Access Journals (Sweden)

    Elisa Cabrera-Guzmán

    Full Text Available Body size at metamorphosis is a key trait in species (such as many anurans with biphasic life-histories. Experimental studies have shown that metamorph size is highly plastic, depending upon larval density and environmental conditions (e.g. temperature, food supply, water quality, chemical cues from conspecifics, predators and competitors. To test the hypothesis that this developmental plasticity is adaptive, or to determine if inducing plasticity can be used to control an invasive species, we need to know whether or not a metamorphosing anuran's body size influences its subsequent viability. For logistical reasons, there are few data on this topic under field conditions. We studied cane toads (Rhinella marina within their invasive Australian range. Metamorph body size is highly plastic in this species, and our laboratory studies showed that larger metamorphs had better locomotor performance (both on land and in the water, and were more adept at catching and consuming prey. In mark-recapture trials in outdoor enclosures, larger body size enhanced metamorph survival and growth rate under some seasonal conditions. Larger metamorphs maintained their size advantage over smaller siblings for at least a month. Our data support the critical but rarely-tested assumption that all else being equal, larger body size at metamorphosis is likely to enhance an individual's long term viability. Thus, manipulations to reduce body size at metamorphosis in cane toads may help to reduce the ecological impact of this invasive species.

  14. Petróleo, seguridad ambiental y exploración petrolera marina en Colombia

    Directory of Open Access Journals (Sweden)

    Avellaneda Cusaría, Alfonso

    2005-01-01

    Full Text Available Este artículo reseña un siglo de las actividades petroleras en Colombia, sus consecuencias en los territorios indígenas, así como los riesgos ambientales y para la salud, destacando por -otra parte- el papel que han asumido algunas compañías para controlar esos riesgos. Se discute las implicaciones sociales y ambientales, directas e indirectas, de las distintas fases de las actividades petroleras en la parte continental del país, y sus relaciones históricas con los procesos de violencia donde ha habido explotación petrolera desde el siglo XX. Finalmente, se abre una discusión sobre la nueva política petrolera del Estado colombiano, con la exploración costa fuera y la ausencia de control ambiental para proteger los ecosistemas que subyacen la licitación de áreas para los próximos años, sin asumir el derecho internacional en la protección marina.

  15. Immune response varies with rate of dispersal in invasive cane toads (Rhinella marina.

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    Gregory P Brown

    Full Text Available What level of immunocompetence should an animal maintain while undertaking long-distance dispersal? Immune function (surveillance and response might be down-regulated during prolonged physical exertion due to energy depletion, and/or to avoid autoimmune reactions arising from damaged tissue. On the other hand, heightened immune vigilance might be favored if the organism encounters novel pathogens as it enters novel environments. We assessed the links between immune defense and long-distance movement in a population of invasive cane toads (Rhinella marina in Australia. Toads were radio-tracked for seven days to measure their activity levels and were then captured and subjected to a suite of immune assays. Toads that moved further showed decreased bacteria-killing ability in their plasma and decreased phagocytic activity in their whole blood, but a heightened skin-swelling response to phytohemagglutinin. Baseline and post-stress corticosterone levels were unrelated to distance moved. Thus, long-distance movement in cane toads is associated with a dampened response in some systems and enhanced response in another. This pattern suggests that sustained activity is accompanied by trade-offs among immune components rather than an overall down or up-regulation. The finding that high mobility is accompanied by modification of the immune system has important implications for animal invasions.

  16. Coating of Sulfonic Silica onto Magnetite from Marina Beach Iron sand, Semarang, Indonesia

    Science.gov (United States)

    Azmiyawati, C.; Suyati, L.; Taslimah; Anggraeni, R. D.

    2017-02-01

    The mineral iron oxide is the main component of sand iron that are abundant in nature. Mineral iron oxide not yet widely applied into more useful products. The main component of iron ore is magnetite. Magnetite can be used as a basic ingredient in the manufacture of magnetite-modified silica adsorbent sulfonate. In this research, the adsorbent made from sulfonic functionalized silica-coated magnetic particle has been successfully produced, with the magnetite was obtained from iron sand at Marina Beach, Semarang Indonesia. This adsorbent was then used as a metal ion preconcentration media. From the research that it was found that the sulfonic has been bound to the silica marked by the emergence of element S on EDX. Whilst, the evidence that silica has coated on the magnetite could be seen from the SEM images which showed the morphology of sulfonic functionalized silica-coated magnetic particles were larger than the sulfonic functionalized silica without magnetite. From the DSC results showed that the addition of magnetite on sulfonic functionalized silica did not change the heat resistance of the sulfonic functionalized silica. Based on the XRD patterns show that magnetite sulfonate silica was formed.

  17. Com'è profondo il mare Gli uominiche lo misurano, l'Istituto Idrografico della Marina

    Directory of Open Access Journals (Sweden)

    Alessandro Nobili

    2014-03-01

    Full Text Available Measuring sea depths: the Italian hydrographic InstituteSince 1873 the Italian Hydrographic Institute (Istituto Idrografico della Marina - IIM has been involved in sea depth measuring in order to improve safety of navigation. The main mission of the institute is to provide hydrographic services for waters of Italian national responsibility required by the International Convention for the Safety of Life at Sea (SOLAS. This role requires the coordination and determination of policy and standards which covers both hydrographic surveying and charting, as well as contributing tothe coordination, exchange and standards related to geospatial data in general. IIM’s traditions and methods take their origins from the pioneers of hydrography; in this paper the author briefl y describes the main stages in IIM’s history, passing throught scientifi c and international activities and concludine with challenges and prospects of digital era.

  18. Antimicrobial activity of Avicennia marina extracts ethanol, methanol & glycerin against Penicillium digitatum (citrus green mold

    Directory of Open Access Journals (Sweden)

    Behrooz Alizadeh Behbahani

    2013-01-01

    Full Text Available Finding natural antimicrobial compound with minimum side effects on health the is important because of microorganisms are more antibiotics resistance. Avicenniaceae family is a member of true mangrove plants which has one genus, 11 species and several sub species. Avicennia marina (Forssk. Vierh is the most current species among these plants in Iranian mangrove forest. In this study, mangrove leaves were dried in shadow and appropriate condition. After extraction with ethanol 96 degree, methanol 96 degree and 20% glycerin antimicrobial effect of extract were determined by "screening antimicrobial activity" and "disk agar diffusion test" in 20, 40, 60 and 80 Percent concentration of the extract against Penicillium digitatum. The results showed that mangrove leaf extract in screening antimicrobial activity method in 2000 μg/ml, were inhibited Penicillium digitatum of growth. In "disk agar diffusion test, mangrove extract, in 20, 40, 60 and 80 Percent concentration, the mentioned extract were shown inhibition effect on mold pathogen growth. Ethanol 96 degree extract was more effective than methanol 96 degree and 20% glycerin extract as antimicrobial against on Penicillium digitatum (p Results showed extract of mangrove can be used as natural antimicrobial in food products.

  19. Assessing establishment success of Zostera marina transplants through measurements of shoot morphology and growth

    Science.gov (United States)

    Li, Wen-Tao; Kim, Jong-Hyeob; Park, Jung-Im; Lee, Kun-Seop

    2010-07-01

    Since significant seagrass declines have been reported worldwide, numerous seagrass restoration projects through transplantation have been attempted in recent decades. In this study, Zostera marina shoots were transplanted into Jindong Bay on the southern coast of Korea in November 2006 to assess establishment success of the transplants to a new transplant environment. Shoot density, individual shoot weight, productivity, and morphological characteristics of transplants and reference plants in the vicinity of the planting site were monitored monthly for 13 months. Although shoot size of transplants was smaller than that of reference plants at the start of transplantation, individual shoot weight, leaf width, shoot height, and rhizome diameter of transplants increased rapidly, reaching even higher values than those of reference plants 5 months after transplantation. These results suggest that eelgrass transplants established morphologically 5 months after transplantation. Shoot productivity of transplants was lower than that of reference population during the first 5-6 months following transplantation, but became higher than that of reference population 6 months after transplantation. The higher transplant productivity was likely due to the lower shoot density at the transplant site than that at the reference population. Rapid changes in shoot morphology and growth of transplants indicated that eelgrass transplants had great morphological plasticity and established successfully in the new environment within 5-6 months. In addition to survival rates of transplants, monitoring of shoot morphology and growth appeared to be an effective approach for accurate assessment of the establishment success of eelgrass transplant.

  20. Actividad antibacteriana y antifúngica de extractos de algas marinas venezolanas

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    Nurby Ríos

    2011-07-01

    Full Text Available En este trabajo se evaluaron las propiedades bioactivas antibacterianas y antimicóticas de 33 extractos (etanol, diclorometano, hexano obtenidos de 11 especies de algas marinas recolectadas en las localidades de San Juan de Los Cayos y Chichiriviche, Estado Falcón, Venezuela. La actividad antibiótica y antimicótica de los extractos se evaluó mediante la aparición de halos de inhibición contra bacterias Gram positivas (Staphylococ- cus aureus, Gram negativas (Pseudomona aeruginosa, Klebsiella pneumoniae, Escherichia coli y el hongo Candida albicans. De los 33 extractos ensayados sólo 17 presentaron actividad antibacteriana (5 con etanol, 6 con diclorometano y 6 con hexano, resultando activos 14 frente a las especies Gram(- y 4 contra la especie Gram(+. Las especies algales que mostraron actividad antibacteriana fueron: Acanthophora sp., Bryothamnion triquetrum, Gracilaria sp., Gelidium sp., Caulerpa mexicana, Caulerpa sp., Caulerpa spp., Halimeda incras- sata, Ulva sp., Codium decorticatum, Sargassum sp. Ninguno de los extractos de algas ensayados presentó actividad antimicótica sobre Cándida albicans. Los resultados obtenidos permiten concluir que las algas de la costa occidental de Venezuela, presentan compuestos bioactivos con actividad antibacteriana.

  1. Influence of Temperature and Salinity on Germination of Eelgrass (Zostera marina L.) Seeds

    Institute of Scientific and Technical Information of China (English)

    PAN Jinhua; YANG Guanpin; JIANG Xin; LI Xiaojie; CONG Yizhou; ZHANG Zhuangzhi; LI Zhiling; ZHOU Weili; HAN Houwei; LUO Shiju

    2011-01-01

    Seagrass restoration as part of ocean ecosystem protection has been launched for many years all over the world, but intensive research on this subject in China has just begun in recent years. Seed broadcasting has been widely accepted as the most potentially useful method for seagrass restoration over large areas. We examined the influence of key environmental factors on seed germination to help promote eelgrass bed restoration. Under anoxic conditions, the influence of temperature and salinity on the germination rate of eelgrass (Zostera marina L.) seeds was examined at different combinations of four temperatures (4, 9, 14, and 24℃) and nine salinities (5 to 45, increment of 5). The effect of significant interaction of temperature and salinity on germination rate was observed (ANOVA)(P<0.001). The highest germination rate (83.3 ±3.5)% was reached in 8 weeks at 14℃ and salinity 5. Higher temperature significantly increased the germination rate at salinity 5 (P<0.001) during the whole observation period except for 24℃,while lower salinity significantly increased the germination rate at 14℃ (P<0.001). Although significant interaction was found between temperature and salinity (P<0.001), the influence of salinity was stronger than that of temperature for the germination of eelgrass seeds. These results provide useful information for the propagation of artificial seedlings for seagrass restoration in China.

  2. Composición Esterólica de la Esponja Marina Xestospongia Muta

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    Carmenza Duque

    2009-10-01

    Full Text Available De la esponja marina Xestospongia muta recolectada en la bahía de Santa Marta, Caribe Colombiano, se aislaron por Cromatografía en Columna (CC sobre Silica gel, eluyendo con Benceno: Acetato de Etilo 10:2, dos fracciones esteróiicas; XMl (Rf = 0,28,Si02/Benceno; AcOEt 10:2 y XM2 (Rf = 0,24,SiO2/Benceno : AcOEt 10:2, Los esteróles presentes en estas dos fracciones fueron sometidos a Cromatografía Liquida de Alta Eficiencia (CLAE preparativa y analizados por Cromatografía de Gases (CG y Cromatografía de Gases acoplada en Espectometrla de Masas (CG-EM, Catorce esteróles fueron separados y 13 idenficados. La mayoría de ellos fueron 3n-0H-A^-Esteróles (Aproximadamente el 87% de los esteróles totales incluyendo al (24R + 24S-5,28-Estigmastadien-3i3-24-diol, mezclaepimérica por primera vez asi reportada en la naturaleza. El porcentaje restante correspondió a Estañóles y a un 6,2% de compuestos sin identificar.

  3. Proteasas extracelulares producidas por bacterias marinas aisladas de aguas contaminadas con efluentes pesqueros

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    Tito Sánchez

    2013-06-01

    Full Text Available Un total de 26 cepas de bacterias marinas con actividad proteolítica fueron aisladas de agua de mar contaminadas con efluentes pesqueros; las mismas que se evaluaron en base al crecimiento y formación de halos de actividad en Agar Marino suplementados con caseína al 1%, pH 8,0 e incubados a 25 ºC por 72 h. Cinco cepas, seleccionadas por presentar los mejores halos de actividad fueron evaluadas a su vez por su crecimiento y producción de proteasas a diferentes concentraciones de NaCl, rangos de temperatura y pH; siendo consideradas finalmente como bacterias halotolerantes, psicrotróficas y alcalófilas moderadas. Estas cepas también fueron evaluadas por su actividad proteolítica específica sobre la caseína, siendo la cepa CM48 (Pseudomonas sp. la que presentó la mejor actividad específica (17,38 U/mg a las 72 horas, y seguidas por las cepas CM45 (Alcaligenes sp. (12,09 U/mg y tres cepas de Aeromonas sp. (CM43, CM44 y CM46 con valores de 12,02; 10,07 y 10,10 U/mg respectivamente.

  4. Policy plans and management measures to restore eelgrass (Zostera marina L.) in the Dutch Wadden Sea

    Science.gov (United States)

    de Jonge, V. N.; de Jong, D. J.; van Katwijk, M. M.

    2000-07-01

    The Dutch Wadden Sea has been changed dramatically over the last centuries by human activities like land reclamation and different forms of fishery. This has, amongst other things, led to changes in the number of biological communities. One of the changes was the near extinction of eelgrass (Zostera marina L.) in the Dutch Wadden Sea. The deterioration of the area led to policy plans in the late 1980s that aimed at restoring the original natural communities of which the eelgrass community was one. This paper presents a restoration strategy which contains a selection procedure for suitable transplantation sites. The selection procedure is based on factors such as sediment composition, exposure time, current velocity and wave action. These were combined in a GIS-based map integrating these factors. One important action in the restoration process is to increase the number of freshwater discharge points to meet the requirements of the brackish water community in general and the growing conditions for eelgrass in particular.

  5. Potential sources of bacteriological pollution for two bays with marinas in Trinidad

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    Christine Ann Bullock

    2005-05-01

    Full Text Available Welcome Bay and Chaguaramas Bay in the northwest peninsula of Trinidad contain large marinas and smaller sections of bathing beaches.Bacteriological surveys were conducted at both bays to assess water quality and to determine potential sources of pollution.These surveys were conducted during the wet season of 1996 and the dry season of 1997.Eleven sample stations were established at Welcome Bay and 12 at Chaguaramas Bay.Freshwater samples were collected from rivers and drains within the survey area.Marine water samples were collected from marinas,bathing beaches and inshore and outer areas at both bays.Five water samples were collected from each sampling station during the wet season of 1996 and six during the dry season of 1997.The membrane filter technique was used to determine faecal coliform and Escherichia coli levels in all samples. There was a seasonal effect on water quality,with significantly higher faecal coliform levels in the wet season, when water quality was not in compliance with international standards.This represents a potential health risk in bathing areas.Water quality was better at the outer area of both bays.Water quality at the inner bay areas was most likely adversely affected by land-based sources of pollution identified in this study.These sources include three drains and two rivers,which discharged into the bays.Yachts were apparently not a source of sewage pollution:there was no significant relationship between yacht number and faecal coliform levels.Las bahías Welcome y Chaguaramas en la península noroeste de Trinidad tienen grandes marinas y secciones pequeñas de playas para bañistas.Se realizaron sondeos bacteriológicos en ambas bahías para determinar la calidad del agua y para señalar fuentes potenciales de contaminación.Estos sondeos fueron realizados durante la época lluviosa de 1996 y la seca de 1997.Once estaciones de muestreo se establecieron en Bahía Welcome y doce en Bahía Chaguaramas.Muestras de

  6. Conservation of eelgrass (Zostera marina genetic diversity in a mesocosm-based restoration experiment.

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    Brian S Ort

    Full Text Available Eelgrass (Zostera marina forms the foundation of an important shallow coastal community in protected estuaries and bays. Widespread population declines have stimulated restoration efforts, but these have often overlooked the importance of maintaining the evolutionary potential of restored populations by minimizing the reduction in genetic diversity that typically accompanies restoration. In an experiment simulating a small-scale restoration, we tested the effectiveness of a buoy-deployed seeding technique to maintain genetic diversity comparable to the seed source populations. Seeds from three extant source populations in San Francisco Bay were introduced into eighteen flow-through baywater mesocosms. Following seedling establishment, we used seven polymorphic microsatellite loci to compare genetic diversity indices from 128 shoots to those found in the source populations. Importantly, allelic richness and expected heterozygosity were not significantly reduced in the mesocosms, which also preserved the strong population differentiation present among source populations. However, the inbreeding coefficient F IS was elevated in two of the three sets of mesocosms when they were grouped according to their source population. This is probably a Wahlund effect from confining all half-siblings within each spathe to a single mesocosm, elevating F IS when the mesocosms were considered together. The conservation of most alleles and preservation of expected heterozygosity suggests that this seeding technique is an improvement over whole-shoot transplantation in the conservation of genetic diversity in eelgrass restoration efforts.

  7. Algas marinas bentónicas de la Isla Gorgona, costa pacífica colombiana

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    Mónica Murillo Muñoz

    2014-02-01

    Full Text Available Se presenta el listado de las algas marinas bénticas del Parque Nacional Natural Isla Gorgona, el inventario corresponde a la flora algal asociada a los diferentes ambientes marinos de la isla, a saber: arrecifes coralinos y fondos blandos. El monitoreo de las comunidades de algas se llevó a cabo entre octubre de 2010 y mayo de 2011, se realizó una estimación de abundancia y cobertura para lo cual se establecieron transeptos paralelos a la línea de costa y se evaluó el porcentaje de cobertura en cuadrantes de 0.25m². Se reportó un total de 43 especies para los dos ambientes estudiados (coralino y fondos blandos, 24 Rhodophyta, 12 Clorophyta, 6 Ochrophyta y una Cyanobacteria. El grupo más representativo fue el perteneciente a la clase Rhodophyceae, que correspondió al 55.8% de la flora inventariada. Los resultados de nuevos registros en la isla ratifican su importancia fitogeográfica, por cuanto la composición florística insular contribuye significativamente a la biodiversidad de la costa pacífica colombiana, destacándose la presencia de arrecifes coralinos como los principales ambientes marinos para el desarrollo de la flora algal de la región.

  8. Caracterización parcial y espectro antimicrobiano de substancias inhibitorias producidas por Alteromonas marinas

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    Jorge León

    2014-06-01

    Full Text Available Se caracterizan parcialmente substancias inhibitorias producidas por cepas marinas del género Alteromonas spp. Pruebas de precipitación de extractos crudos de sobrenadantes de las cepas N22.C y N11.6 con concentraciones saturantes de sulfato de amonio y filtrados en columnas de Sephadex G-25 muestran la producción de substancias inhibitorias (SI de naturaleza proteinácea. Otros ensayos de caracterización revelan que dichas substancias tienen un amplio espectro de actividad antibiótica frente a cepas de colección patógenas de peces, moluscos y crustáceos. Asimismo, muestran a las SI como termosensibles a 90oC en 45 min y con capacidad de mantener estabilidad inhibitoria dentro, del rango de pH de 3,0 a 9,0 hasta por 15 min. La actividad antibiótica de las substancias frente a Vibrio anguillarum NCMB 2133, V. anguillarum ATCC 19264 y Aeromonas salmonicida 67,79 fueron comparativamente equivalentes a 30 ppm del antibiótico oxitetraciclina (OTC.

  9. An ultrastructural study of spermatogenesis and sperm morula breakdown in Arenicola marina (L.) (Annelida: Polychaeta)

    Science.gov (United States)

    Pacey, A. A.; Bentley, M. G.

    1992-06-01

    Spermatogenesis in the lugworm Arenicola marina, in common with other members of Arenicolidae, occurs in the coelomic fluid and results in the formation of discs of mature spermatozoa known as a morulae. Within a morula, individual spermatozoa are connected by a common mass of cytoplasm called the cytophore and therefore make up a syncitium. Immediately prior to spawning, and in response to an endocrine substance known as “Sperm Maturation Factor” (SMF), the structure of the sperm morulae breaks down and free spermatozoa are liberated. These are subsequently spawned from the body cavity. The investigation described here uses transmission electron microscopy to investigate the ultrastructural changes, which accompany spermatogenesis and the breakdown of sperm morulae in response to SMF in vitro. The study demonstrates that the cytophore appears to have a key role both during spermatogenesis and during sperm morula breakdown. The ultrastructure of sperm morulae and of mature spermatozoa is described. The structure of spermatozoa is shown to be primitive with a single flagellum which appears to be coiled at its distal end. The phagocytosis of free spermatozoa by coelomocytes is also described and it is suggested that these may play a role in the resorption of unspawned gametes in vivo.

  10. Copper treatment during storage reduces Phytophthora and Halophytophthora infection of Zostera marina seeds used for restoration

    Science.gov (United States)

    Govers, Laura L.; van der Zee, Els M.; Meffert, Johan P.; van Rijswick, Patricia C. J.; Man in ‘t Veld, Willem A.; Heusinkveld, Jannes H. T.; van der Heide, Tjisse

    2017-01-01

    Restoration is increasingly considered an essential tool to halt and reverse the rapid decline of vital coastal ecosystems dominated by habitat-forming foundation species such as seagrasses. However, two recently discovered pathogens of marine plants, Phytophthora gemini and Halophytophthora sp. Zostera, can seriously hamper restoration efforts by dramatically reducing seed germination. Here, we report on a novel method that strongly reduces Phytophthora and Halophytophthora infection of eelgrass (Zostera marina) seeds. Seeds were stored in seawater with three different copper sulphate concentrations (0.0, 0.2, 2.0 ppm) crossed with three salinities (0.5, 10.0, 25.0 ppt). Next to reducing seed germination, infection significantly affected cotyledon colour: 90% of the germinated infected seeds displayed a brown cotyledon upon germination that did not continue development into the seedling stage, in contrast to only 13% of the germinated non-infected seeds. Copper successfully reduced infection up to 86% and the 0.2 ppm copper sulphate treatment was just as successful as the 2.0 ppm treatment. Infection was completely eliminated at low salinities, but green seed germination was also dramatically lowered by 10 times. We conclude that copper sulphate treatment is a suitable treatment for disinfecting Phytophthora or Halophytophthora infected eelgrass seeds, thereby potentially enhancing seed-based restoration success. PMID:28225072

  11. Cobetia marina CICC10367渗透压冲击下羟基四氢嘧啶的合成及释放%Hydroxyectoine synthesis and release under osmotic shock in Cobetia marina CICC10367

    Institute of Scientific and Technical Information of China (English)

    郎亚军; 任亚男; 柏林; 张苓花

    2009-01-01

    [目的]筛选获得耐受渗透压冲击的羟基四氢嘧啶合成菌株,利用"细菌挤奶"工艺提高羟基四氢嘧啶的产率.[方法]从盐池中分离羟基四氢嘧啶合成菌株,并对其进行形态、生理生化及16s rDNA鉴定.考察了培养基及其Nacl浓度对羟基四氢嘧啶合成的影响,在优化的条件下利用"细菌挤奶"工艺制备羟基四氢嘧啶.[结果]筛选获得的一株羟基四氢嘧啶合成菌株,鉴定为Cobetia marina CICC10367(C.marina CICC10367).NaCl浓度为90 g/L的、谷氨酸单钠为唯一碳氮源的培养基有利于羟基四氢嘧啶合成,最高合成量为694.5 mg/L 6次渗透压冲击的细菌挤奶,羟基四氢嘧啶的总合成量4179.O mg/L,产率597.0 mg/L/d,羟基四氢嘧啶对底物的转化率为80.2 mg/g.[结论]筛选获得的菌株C.marina CICC10367在NaCl诱导下合成羟基四氢嘧啶,该菌株耐受渗透压冲击,利用细菌挤奶工艺显著地提高了该菌株羟基四氢嘧啶的产率和转化率.%[Objective]To obtain hydroxyectoine-producing strain with tolerance to osmotic shock and improve hydroxyectoine productivity by adopting "bacteria milking" process.[Methods]We isolated a strain from salt lake, and then carried out the identifications of morphology, physiological and biochemical characteristics of the strain. We also investigated the effects of the medium and its NaCl concentration on the hydroxyectoine synthesis of this strain. Under optimal condition, hydroxyectoine was produced by adopting "bacteria milking" process.[Results]A hydroxyectoine-producing strain was obtained and identified as Cobetia marina CICC10367 ( C. marina CICC10367) . It could enhance hydroxyeceoine synthesis when the medium adopting monosodium glutamate as the sole source of carbon and nitrogen at 90 g/L NaCl. The highest synthesized hydroxyectoine concentration was 694.5 mg/L in the above described medium. After the "bacteria milking" process of six osmotic shock, the total concentration of

  12. Changes in Organic, Inorganic contents, Carbon Nitrogen ratio in decomposing Avicennia marina and Rhizophora mucronata leaves on tidal mudf lats in Hajambro creek, Indus delta, Pakistan

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    Zafar Farooqui

    2014-01-01

    Full Text Available Leaf decomposition of Avicennia marina (Forskal Vierh in Denkschr and Rhizophora mucronata (Poiret was studied in situ using litterbag s in Hajambro creek, Indus delta. A single exponential model was presented, which best described the rate of decomposition for both the species. The rate of decomposition was species specific, A. marina leaves decomposed slower than the R. mucronata (p<0.001. The time in days required for 50% loss of the initial dry mass (t1/2 was 49.55 days for the A. marina and 44.43 days in case of R. mucronata. The organic content in the leaves was high initially but decresed gradually during decomposition, which is negatively correlated with inorganic contents. This study will help in the management and conservation of mangrove ecosystem of Hajambro creek, Indus delta, Pakistan.

  13. Vegetación marina en la elaboración de bloques multinutritivos para la alimentación de rumiantes

    OpenAIRE

    Arturo F. Castellanos Ruelas; Félix Cauich Huchim; Luis A. Chel Guerrero; J. Gabriel Rosado Rubio

    2010-01-01

    El objetivo del presente trabajo fue evaluar el efecto de la incorporación de vegetación marina, melaza, urea e hidróxido de calcio (CaOH) en un bloque multinutritivo (BM) sobre su valor nutricio y su dureza. Se colectó vegetación marina que llegó en arribazón a las costas de Yucatán. Este material se lavó con agua dulce y se deshidrató al sol. Se elaboraron BM incorporando un 9.5 % de vegetación marina, además de cascarilla de soya, maíz molido, melaza, ortofosfato de calcio, sal común, ácid...

  14. Expression and characterization analysis of type 2 metallothionein from grey mangrove species (Avicennia marina) in response to metal stress

    Energy Technology Data Exchange (ETDEWEB)

    Huang Guoyong, E-mail: huang_gyh@sina.com [Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301 (China); State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China); Wang Youshao [Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301 (China)

    2010-08-01

    Metallothioneins (MTs) are a family of low-molecular-weight cysteine-rich proteins and are thought to play possible roles in metal metabolism or detoxification. To evaluate the roles of metallothioneins in metal homeostasis or tolerance in Avicennia marina, a real-time quantitative PCR protocol was developed to directly evaluate the expression of AmMT2 mRNA, when A. marina seedlings were exposed to different concentrations of zinc (Zn), copper (Cu) or lead (Pb) for 3 and 7 d. Real-time quantitative PCR results indicated that the regulation of AmMT2 mRNA expression by Zn, Cu and Pb was strongly dependent on concentration and time of exposure. A significant increase in the transcripts of AmMT2 gene was also found in response to Zn, Cu and Pb, at least under some experimental conditions. When AmMT2 was overexpressed in Escherichia coli BL21 as a carboxy-terminal extension of glutathione-S-transferase (GST), the transgenic bacteria showed an increased tolerance to Zn, Cu, Pb and Cd exposure as compared to control strains. Moreover, GST-AmMT2 was purified from E. coli cells grown in the presence of 400 {mu}M Zn, Cu, Pb or Cd. The purified GST-AmMT2 fusion protein could bind higher levels of all four metals than GST alone. Taken together, these data support the hypothesis that AmMT2 may be involved in processes of metal homeostasis or tolerance in A. marina.

  15. Aerial root adaptations of Rhizophora apiculata Bl. and Avicennia marina Vierh. to the changes of water levels

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    Bamroongrugsa, N.

    2005-07-01

    Full Text Available Aerial root adaptations of Rhizophora apiculata Bl. and Avicennia marina Vierh. as related to the changes of water levels were carried out on abandoned shrimp ponds of Prince of Songkla University, Pattani Campus, in four water level study plots; 10 cm below soil surface, soil surface level, 10 and 20 cm above soil surface. The results revealed that survival rates of two species were 100 percent in all treatments. Growth of R. apiculata were high in three levels of flooding: soil surface level, 10 and 20 cm above soil surface in the 4th and 8th month. In one year growth of R. apiculata grown in four level of water were slightly different (height: 10 cm below soil surface = 101.35 cm, soil surface level = 108.55 cm, 10 cm above soil surface = 102.20 cm and 20 cm above soil surface = 90.24 cm. The growth of A. marina was highest in 10 cm below soil surface (height = 196.78 cm and growth was high in soil surface level and 10 cm above soil surface (height = 183.66 and 158.53 cm, respectively. The lowest growth was found in 20 cm above soil surface (height = 122.65 cm.. The stilt root of R. apiculata showed good development in two levels of flooding: soil surface level and 10 cm above soil surface, except in circumference of prop root which was biggest in the 20 cm above soil surface. The pneumatophores of A. marina had good development in three water levels: 10 cm below soil surface, soil surface level and 10 cm above soil surface, except in height which was low in 10 cm below soil surface and high in 10 and 20 cm above soil surface. The results of this investigation showed be successfully applied for two mangroves planting and restoration.

  16. Long-Term Field Study Reveals Subtle Effects of the Invasive Alga Sargassum muticum upon the Epibiota of Zostera marina.

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    Stacey DeAmicis

    Full Text Available Invasive species can alter coastal ecosystems both directly, e.g. through competition for substratum and nutrients, and indirectly. Indirect effects may be mediated by creation of dissimilar or inimical habitats, changes in predator and/or prey assemblages, alterations in associated biota, and perturbations of water movement and thermal regimes. Previous studies have shown that invasive algae can modify native habitat architecture, disrupt intricately linked food webs and alter epibiotic assemblages. In the UK, the seagrass Zostera marina supports a diverse epibiotic assemblage, influencing key factors such as sediment dynamics, depositional regime and trophic linkages. Increasing encroachment of the invasive alga Sargassum muticum into seagrass meadows changes the physical and chemical characteristics of the local environment and creates the potential for changes in the epibionts associated with the seagrass blades, threatening the integrity of the seagrass ecosystem. We investigated the effects of S. muticum invasion upon the epibiota of Z. marina in a drowned river valley in SW England seasonally from spring to autumn over four years in an in-situ manipulative experiment, comparing permanent quadrats with and without artificially introduced S. muticum. Epibiota were weighed, identified to the most detailed operational taxonomic unit (OTU possible, and unitary organisms were enumerated. Multivariate PERMANOVA+ analysis revealed significant differences in epibiont assemblages between Sargassum treatments. Linear mixed effects models indicated that differences in epibiota assemblage composition were not reflected as significant differences in mean biomass per sample, or number of epibiont OTUs per sample. We conclude that S. muticum invasion into Z. marina meadows may significantly alter the species composition and abundance distribution of epibiotic assemblages found on the blades of the seagrass. Thus S. muticum invasion could have more wide

  17. Annual variations of biomass and photosynthesis in Zostera marina at its southern end of distribution in the North Pacific

    Science.gov (United States)

    Cabello-Pasini, Alejandro; Munoz-Salazar, R.; Ward, D.H.

    2003-01-01

    Density, biomass, morphology, phenology and photosynthetic characteristics of Zostera marina were related to continuous measurements of in situ irradiance, attenuation coefficient and temperature at three coastal lagoons in Baja California, Mexico. In situ irradiance was approximately two-fold lower at San Quintin Bay (SQ) than at Ojo de Liebre Lagoon (OL) and San Ignacio Lagoon (SI). As a consequence of the greater irradiance, plants at OL and SI were established 1 m deeper within the water column than those at SQ. At SQ, there was a four-fold variation in biomass of Z. marina caused by changes on shoot length and not shoot density, while at OL and SI biomass and shoot length did not fluctuate significantly throughout the year. Reproductive shoot density reached maximum values concomitantly with the greatest irradiance during spring-summer, however, the density was approximately three-fold greater at SQ than at the southern coastal lagoons. While irradiance levels were two-fold greater at the southern lagoons, in general, photosynthetic characteristics were similar among all three lagoons. The hours of light saturated photosynthesis, calculated from their photosynthetic characteristics and irradiance measurements, suggest that photosynthesis of shoots from OL and SI are saturated for more than 6 h per day throughout the year, while shoots from SQ are likely light limited during approximately 15% of the year. Consequently, an increase in attenuation coefficient values in the water column will likely decrease light availability to Z. marina plants at SQ, potentially decreasing their survival. ?? 2003 Elsevier Science B.V. All rights reserved.

  18. Long-Term Field Study Reveals Subtle Effects of the Invasive Alga Sargassum muticum upon the Epibiota of Zostera marina

    Science.gov (United States)

    2015-01-01

    Invasive species can alter coastal ecosystems both directly, e.g. through competition for substratum and nutrients, and indirectly. Indirect effects may be mediated by creation of dissimilar or inimical habitats, changes in predator and/or prey assemblages, alterations in associated biota, and perturbations of water movement and thermal regimes. Previous studies have shown that invasive algae can modify native habitat architecture, disrupt intricately linked food webs and alter epibiotic assemblages. In the UK, the seagrass Zostera marina supports a diverse epibiotic assemblage, influencing key factors such as sediment dynamics, depositional regime and trophic linkages. Increasing encroachment of the invasive alga Sargassum muticum into seagrass meadows changes the physical and chemical characteristics of the local environment and creates the potential for changes in the epibionts associated with the seagrass blades, threatening the integrity of the seagrass ecosystem. We investigated the effects of S. muticum invasion upon the epibiota of Z. marina in a drowned river valley in SW England seasonally from spring to autumn over four years in an in-situ manipulative experiment, comparing permanent quadrats with and without artificially introduced S. muticum. Epibiota were weighed, identified to the most detailed operational taxonomic unit (OTU) possible, and unitary organisms were enumerated. Multivariate PERMANOVA+ analysis revealed significant differences in epibiont assemblages between Sargassum treatments. Linear mixed effects models indicated that differences in epibiota assemblage composition were not reflected as significant differences in mean biomass per sample, or number of epibiont OTUs per sample. We conclude that S. muticum invasion into Z. marina meadows may significantly alter the species composition and abundance distribution of epibiotic assemblages found on the blades of the seagrass. Thus S. muticum invasion could have more wide-reaching effects on

  19. Artificially produced [7-formyl]-chlorophyll d functions as an antenna pigment in the photosystem II isolated from the chlorophyllide a oxygenase-expressing Acaryochloris marina.

    Science.gov (United States)

    Tsuchiya, Tohru; Akimoto, Seiji; Mizoguchi, Tadashi; Watabe, Kazuyuki; Kindo, Hayato; Tomo, Tatsuya; Tamiaki, Hitoshi; Mimuro, Mamoru

    2012-08-01

    Acaryochloris marina, a chlorophyll (Chl) d-dominated cyanobacterium, is a model organism for studying photosynthesis driven by far-red light using Chl d. Furthermore, studies on A. marina may provide insights into understanding how the oxygenic photosynthetic organisms adapt after the acquisition of new Chl. To solve the reaction mechanism of its unique photosynthesis, photosystem (PS) II complexes were isolated from A. marina and analyzed. However, the lack of a molecular genetic method for A. marina prevented us from conducting further studies. We recently developed a transformation system for A. marina and we introduced a chlorophyllide a oxygenase gene into A. marina. The resultant transformant accumulated [7-formyl]-Chl d, which has never been found in nature. In the current study, we isolated PS II complexes that contained [7-formyl]-Chl d. The pigment composition of the [7-formyl]-Chl d-containing PS II complexes was 1.96±0.04 Chl a, 53.21±1.00 Chl d, and 5.48±0.33 [7-formyl]-Chl d per two pheophytin a molecules. In contrast, the composition of the control PS II complexes was 2.01±0.06 Chl a and 62.96±2.49 Chl d. The steady-state fluorescence and excitation spectra of the PS II complexes revealed that energy transfer occurred from [7-formyl]-Chl d to the major Chl d species; however, the electron transfer was not affected by the presence of [7-formyl]-Chl d. These findings demonstrate that artificially produced [7-formyl]-Chl d molecules that are incorporated into PS II replace part of the Chl d molecules and function as the antenna. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial. Copyright © 2012 Elsevier B.V. All rights reserved.

  20. Indice de la microflora marina de Venezuela: diatomeas, dinoflagelados y cocolitofóridos

    Directory of Open Access Journals (Sweden)

    José Rafael Díaz-Ramos

    2000-12-01

    Full Text Available Los estudios sobre el fitoplancton marino de Venezuela han sido realizados de manera regular desde mediados del siglo XX. Sin embargo, hasta ahora no se ha realizado un compendio de las especies encontradas que sirva como marco de referencia a los trabajos taxonómicos. En este trabajo se presenta por primera vez un índice de la microflora marina de Venezuela. El índice incluye sólo las diatomeas (89 especies céntricas y 186 especies pennadas, los dinoflagelados (ocho especies atecadas y 154 especies tecadas y los cocolitóforidos (24 especies a los cuales se les realizado una diagnosis formal e ilustraciones (dibujos y/o fotografias y que han sido reportados en la literatura científica (revistas y/o tesis de licenciatura o maestría. Esta ordenado según la clase, orden, familia y especie. Además, en el se cita al autor (es de cada taxón.ha.The marine phytoplankton of Venezuela has been studied on a regular basis since the mid 20th century. However, a species checklist that can be used as a framework for taxonomic studies is lacking. In this paper, an index of the marine microflora of Venezuela is presented for the first time. The index includes only those diatoms (89 centric and 186 pennate species, dinoflagellates (eight naked and 154 thecate species and coccolithophores (24 especies for which formal diagnosis and illustrations (drawings and/or photographs have been reported in the scientific literature (journals and/or first degree or master's theses. It is ordered alphabetically according to class, order, family, and species. It includes the author (s of the taxa.

  1. Rubrivirga marina gen. nov., sp. nov., a member of the family Rhodothermaceae isolated from deep seawater.

    Science.gov (United States)

    Park, Sanghwa; Song, Jaeho; Yoshizawa, Susumu; Choi, Ahyoung; Cho, Jang-Cheon; Kogure, Kazuhiro

    2013-06-01

    Two aerobic, Gram-stain-negative, pale-red-pigmented and rod-shaped bacterial strains, designated SAORIC-26 and SAORIC-28(T), were isolated from seawater (3000 m depth) from the Pacific Ocean. Phylogenetic analysis based on their 16S rRNA gene sequences revealed that the novel isolates could be affiliated with the family Rhodothermaceae of the class Cytophagia. Strains SAORIC-26 and SAORIC-28(T) shared 99.7% pairwise sequence similarity with each other and showed less than 92.6% similarity with other cultivated members of the class Cytophagia. The strains were found to be non-motile, oxidase-positive, catalase-negative and able to hydrolyse gelatin and aesculin. The DNA G+C contents were determined to be 64.8-65.8 mol% and MK-7 was the predominant menaquinone. Summed feature 9 (iso-C17:1ω9c and/or C16:0 10-methyl), summed feature 3 (C16:1ω6c and/or C16:1ω7c) and iso-C15:0 were found to be the major cellular fatty acids. On the basis of this taxonomic study using a polyphasic approach, it was concluded that strains SAORIC-26 and SAORIC-28(T) represent a novel species of a new genus in the family Rhodothermaceae, for which the name Rubrivirga marina gen. nov., sp. nov. is proposed. The type strain of the type species of is SAORIC-28(T) (=KCTC 23867(T)=NBRC 108816(T)). An additional strain of the species is SAORIC-26.

  2. Biocalcarenites as construction materials in Santa Marina de Aguas Santas Church at Cordoba, Spain

    Directory of Open Access Journals (Sweden)

    Meroño, J. E.

    2009-03-01

    Full Text Available This study consisted in characterizing the materials used to build Santa Marina de Aguas Santas Church at Cordoba and locating the original quarries. The techniques used in the lithological and chemical characterization included XRD, petrographic microscopy and electron dispersive scanning microscopy. The chemical index of weathering (CIW was used to quantify the state of stone decay. The lithology and different types of alterations observed were mapped. A comparison of the material on the building to ancient quarries identified “Naranjo” as the possible site where the stone was originally quarried.Para la caracterización litológica y determinación del grado de alteración de los materiales pétreos se han empleado las siguientes técnicas: difracción de rayos X (método del polvo, microscopía petrográfica (sobre lámina delgada y microscopía de barrido con EDS (energía dispersiva de rayos X, para determinar la composición química. El estado de degradación del material pétreo se ha cuantificado a partir del índice químico de alteración (CIW. Se han realizado cartografías sobre la fachada oeste: a de las litologías presentes y b de los diferentes tipos de alteración observados. La comparación de muestras del edificio con las de antiguas canteras ha permitido identificar la del Naranjo como la posible cantera de origen.

  3. High mortality of Zostera marina under high temperature regimes but minor effects of the invasive macroalgae Gracilaria vermiculophylla

    DEFF Research Database (Denmark)

    Höffle, Hannes; Thomsen, M.S.; Holmer, M.

    2011-01-01

    The present study tested for density-dependent effects of the invasive drift macroalgae Gracilaria vermiculophylla (Ohmi) Papenfuss on growth and survival of the native eelgrass, Zostera marina L., under different temperature levels. Three weeks laboratory experiments were conducted in Odense...... elongation rates being negatively affected, while the leaf plastochrone interval increased. Relative growth rate was significantly higher at 21 C than at 18 C or 27 C, whereas rhizome elongation was significantly lowest at 27 C. Elemental sulphur content in the plant tissues increased significantly...

  4. COMPORTAMIENTO ESTACIONAL DE LA CAPA DE MEZCLA MARINA EN LA REGIÓN NORTE DEL GOLFO DE CALIFORNIA

    OpenAIRE

    Emilio Palacios Hernández; Laura Carrillo B.

    2016-01-01

    Se realiza l a descripción de la profundidad de la capa de mezcla marina superficial (PCM) en la Región Norte del Golfo de California (RNGC), utilizando datos hidrográficos obtenidos en 17 cruceros oceanográficos desde 1971 hasta 1996. La profundidad de la capa se estima directament e de los perfiles de densidad . El promedio de distribución espacial muestra un máximo bien definido en la salida del canal de Ballenas y un mínimo en las costas de Sonora y de Baja ...

  5. Estudio de viabilidad de una infraestructura marina para monitorizar las interacciones entre las actividades industriales y el medio ambiente

    OpenAIRE

    Mánuel González, Àlvar

    2012-01-01

    El objeto de este proyecto es definir, diseñar y construir una instalación marina prototipo capaz de monitorizar las interacciones entre las actividades industriales y el medio ambiente. Con tal fin se propone instalar en el mar un equipamiento de adquisición de parámetros ambientales. El equipamiento de adquisición, como el resto de sistemas que sustentan la infraestructura, tales como el sistema de alimentación, comunicación y control, se encontrarán soportados por un sistema de flotació...

  6. Different bacterial communities associated with the roots and bulk sediment of the seagrass Zostera marina

    DEFF Research Database (Denmark)

    Jensen, Sheila Ingemann; Kühl, Michael; Priemé, Anders

    2007-01-01

    The bacterial community of Zostera marina-inhabited bulk sediment vs. root-associated bacteria was investigated by terminal restriction fragment length polymorphism and sequencing, and the spatial extension of the oxygen loss from roots was determined by oxygen microsensors. Extensive oxygen loss......-colonizers, whereas TRFs assigned to Deltaproteobacteria became increasingly important in the root-associated community of the older root bundles. The presence of the roots thus apparently selects for a distinct bacterial community, stimulating the growth of potential symbiotic Epsilon- and Gammaproteobacteria and...

  7. Contribución al estudio químico de tres especies de algas marinas peruanas

    OpenAIRE

    Acha de la Cruz, Otilia

    1995-01-01

    En el presente trabajo de Investigación, se hicieron estudios químicos en tres especies de algas marinas peruanas. En la especie Macrocystis piryfera se hicieron estudios de compuestos orgánicos e inorgánicos. Respecto a los compuestos inorgánicos, se determinó un gran contenido de minerales, (esta especie es un suplemento ideal para fertilizantes en la agricultura). Respecto a los compuestos orgánicos se hizo un estudio con variación estacional del contenido del ácido algínico, mani...

  8. Análisis preliminar de la estructura primaria y secundaria del ARNtTrp en tortugas marinas

    OpenAIRE

    Harvey Infante-Rojas; Javier Hernández-Fernández

    2015-01-01

    Actualmente existen siete especies de tortugas marinas, todas amenazadas o en riesgo inminente de extinción. Los estudios con ADN mitocondrial han permitido hacer acercamientos sobre filogenia, evolución, rutas migratorias y centros de dispersión, además para la identificación de polimorfismos y haplotipos, siendo base para planes de manejo y conservación. El presente estudio representa la primera descripción comparada de la estructura primaria y secundaria del ARNtTrp mitocondrial en tortuga...

  9. RELACIONES TROFICAS DE LA BALLENA JOROBADA (MEGAPTERA NOVAEANGLIAE) EN EL AREA MARINA COSTERA PROTEGIDA FRANCISCO COLOANE, ESTRECHO DE MAGALLANES, CHILE

    OpenAIRE

    HARO DIAZ, DANIELA PAZ

    2013-01-01

    El Área Marina Costera Protegida (AMCP) Francisco Coloane, localizada en el estrecho de Magallanes, es una de las tres áreas de alimentación informadas para la ballena jorobada del Pacífico Sur Oriental. En este trabajo se analiza la dieta de esta especie durante su temporada de alimentación en el AMCP, en los años 2011 y 2012, mediante el análisis de isótopos estables de carbono y nitrógeno. La ballena jorobada consume principalmente langostino de los canales y sardina fueguina, presentando ...

  10. Identificación de las prioridades de conservación de la biodiversidad marina y costera en Costa Rica

    Directory of Open Access Journals (Sweden)

    Juan José Alvarado

    2011-06-01

    Full Text Available Costa Rica es un país reconocido por su alta diversidad de especies y ecosistemas, tanto en sus ambientes terrestres como marinos. A pesar de esta importancia, presenta un rezago en la conservación y manejo de la biodiversidad marina y costera, con respecto a la terrestre. Para el año 2006, la superficie marina protegida era de 5 208.8km² y 331.5km de línea costera, en 20 áreas silvestres protegidas. El país ha logrado importantes avances en la selección de sitios prioritarios para la conservación de la biodiversidad terrestre y de aguas continentales, aunque pocos esfuerzos se han realizado hasta el momento en la planificación marina. En este trabajo se muestra el análisis y resultados de un proceso de identificación de vacíos en la representatividad de la biodiversidad marina y costera en el sistema de áreas protegidas de Costa Rica. El estudio se construyó a partir de la información espacial disponible sobre la presencia y distribución de la biodiversidad marina y costera, el establecimiento de metas de conservación y el análisis de amenazas sobre la integridad ecológica de la biodiversidad. Posteriormente, se llevó a cabo la selección de sitios prioritarios mediante técnicas de optimización espacial, y la sobreposición con la actual capa de áreas marinas protegidas, para finalmente identificar los vacíos en la representatividad. En total, se identificaron 19 076km² de vacíos de conservación, 1 323km² en el Caribe y 17 753km² en el Pacífico. Se plantean recomendaciones dirigidas hacia la ampliación y fortalecimiento del sistema de áreas marinas protegidas del país, en el cual se usan los vacíos identificados como marco de referencia. Se espera que los resultados presentes sean parte de la base científica necesaria para la planificación de la conservación y uso sostenible de la biodiversidad marina en el país.

  11. Análisis de la biodiversidad de algas marinas situadas entre Uaymitún y Chuburná, Yucatán

    OpenAIRE

    I. Sánchez-Molina; J. González-Ceballos; C. Zetina-Moguel; R. Casanova-Cetz

    2007-01-01

    Las algas marinas participan en los equilibrios físico-químicos, el ciclo del carbono y sustentan tramas alimenticias de ambientes costeros. A pesar de su importancia los estudios realizados de este grupo de organismos en Yucatán son escasos. El objetivo de este trabajo es contribuir al conocimiento de la biodiversidad de algas marinas en la zona costera de Yucatán, comprendida entre Uaymitún y Chuburná, con la finalidad de fundamentar estudios de ingeniería ambiental. Se hicieron recorridos ...

  12. Valoración económica del buceo como estrategia de uso sostenible de la biodiversidad marina, Archipielago de San Andres y Providencia, Caribe Colombiano.

    OpenAIRE

    James Cruz. Johannie L.; Márquez Calle Germán

    2011-01-01

    El buceo es un uso alternativo y no consuntivo de la biodiversidad marina que, debidamente practicado, tiene bajo impacto ambiental, estimula la conservación de los arrecifes y es una opción económica para habitantes de áreas arrecifales o con potencial para el buceo. El archipiélago de San Andrés, Providencia y Santa Catalina, declarado por UNESCO Reserva Mundial de la Biosfera Seafl ower, con 65.000 km2 de Áreas Marinas Protegidas y un extenso complejo arrecifal coralino, tiene condiciones ...

  13. Análisis y diseño de una intranet para la Marina de Guerra del Perú

    OpenAIRE

    Alvarez Herrera, Cesar Manuel

    2000-01-01

    La Marina de Guerra del Perú tiene como misión garantizar la independencia, soberanía e integridad territorial, contribuyendo al desarrollo económico y social del país. Dada la naturaleza de sus funciones, esta Institución cuenta con dependencias en Lima, Callao y en provincias. Un elemento necesario en la toma de decisiones es la obtención de información en el lugar adecuado y tiempo oportuno. Para el cumplimiento de su misión la Marina cuenta con una red de comunicaciones a nivel naciona...

  14. Consumo de algas marinas: su influencia en el valor nutritivo de la dieta y en diversos parámetros fisiológicos

    OpenAIRE

    Millán Lence, Rosendo

    2016-01-01

    En general, las algas marinas son una buena fuente de fibra al mismo tiempo que proporcionan vitaminas, minerales y nutracéuticos de interés para la alimentación humana. Por ello, en este estudio se analiza cómo influye la ingesta de las algas marinas Porphyra purpurea, Undaria pinnatifida, Himanthalia elongata, Ulva rigida y Codium tomentosum en la calidad nutritiva del alimento y en diversos parámetros hemáticos. Debido a que las enzimas implicadas en los procesos digestivos se adaptan a la...

  15. Identification and characterization of a chitin-binding protein purified from coelomic fluid of the lugworm Arenicola marina defining a novel protein sequence family

    DEFF Research Database (Denmark)

    Vitashenkova, Nina; Moeller, Jesper Bonnet; Leth-Larsen, Rikke

    2012-01-01

    We have isolated a novel type of lectin named Arenicola marina lectin-1 (AML-1) from the lugworm Arenicola marina. The lectin was purified from the coelomic fluid by affinity chromatography on a GlcNAc-derivatized column and eluted with GlcNAc. On SDS-PAGE, AML-1 showed an apparent molecular mass...... by coelomocytes, in the nephridium and in round cells in epidermis and in eggs. Moreover, AML-1 expression was up-regulated in response to a parasitic infection. We conclude that AML-1 purified from coelomic fluid is encoded by AML-1b and represents a novel type of protein family that binds acetylated components....

  16. El papel del voluntariado en la conservación de tortugas marinas en la península de Guanahacabibes, Cuba

    OpenAIRE

    Azanza Ricardo, Julia; Ibarra Martín, Maria Elena; Cobián Rojas, Dorka

    2014-01-01

    El presente artículo está encaminado a caracterizar las etapas de trabajo del proyecto universitario destinado a la conservación de las tortugas marinas en Cuba como una iniciativa para combinar la investigación y los esfuerzos de conservación, así como destacar el papel de los colaboradores voluntarios en estas tareas. El “Proyecto Universitario para el Estudio y Conservación de las tortugas marinas en Cuba”, que se inició en el año 1998, se ha desarrollado en tres etapas con un papel cada v...

  17. Hybridization and massive mtDNA unidirectional introgression between the closely related Neotropical toads Rhinella marina and R. schneideri inferred from mtDNA and nuclear markers

    Directory of Open Access Journals (Sweden)

    Schneider Horacio

    2011-09-01

    Full Text Available Abstract Background The classical perspective that interspecific hybridization in animals is rare has been changing due to a growing list of empirical examples showing the occurrence of gene flow between closely related species. Using sequence data from cyt b mitochondrial gene and three intron nuclear genes (RPL9, c-myc, and RPL3 we investigated patterns of nucleotide polymorphism and divergence between two closely related toad species R. marina and R. schneideri. By comparing levels of differentiation at nuclear and mtDNA levels we were able to describe patterns of introgression and infer the history of hybridization between these species. Results All nuclear loci are essentially concordant in revealing two well differentiated groups of haplotypes, corresponding to the morphologically-defined species R. marina and R. schneideri. Mitochondrial DNA analysis also revealed two well-differentiated groups of haplotypes but, in stark contrast with the nuclear genealogies, all R. schneideri sequences are clustered with sequences of R. marina from the right Amazon bank (RAB, while R. marina sequences from the left Amazon bank (LAB are monophyletic. An Isolation-with-Migration (IM analysis using nuclear data showed that R. marina and R. schneideri diverged at ≈ 1.69 Myr (early Pleistocene, while R. marina populations from LAB and RAB diverged at ≈ 0.33 Myr (middle Pleistocene. This time of divergence is not consistent with the split between LAB and RAB populations obtained with mtDNA data (≈ 1.59 Myr, which is notably similar to the estimate obtained with nuclear genes between R. marina and R. schneideri. Coalescent simulations of mtDNA phylogeny under the speciation history inferred from nuclear genes rejected the hypothesis of incomplete lineage sorting to explain the conflicting signal between mtDNA and nuclear-based phylogenies. Conclusions The cytonuclear discordance seems to reflect the occurrence of interspecific hybridization between these

  18. Accumulation and distribution of heavy metals in the grey mangrove, Avicennia marina (Forsk.)Vierh.: biological indication potential

    Energy Technology Data Exchange (ETDEWEB)

    MacFarlane, G.R.; Pulkownik, A.; Burchett, M.D

    2003-05-01

    Mangrove roots may serve as a sensitive bio-indicator for metal pollution in estuarine systems. - The accumulative partitioning of the heavy metals Cu, Pb and Zn in the grey mangrove, Avicennia marina, were studied under field conditions. Copper and Pb were accumulated in root tissue to levels higher than surrounding sediment levels. Zinc was accumulated to levels reflecting sediment concentrations. Strong linear relationships existed for all metals in sediments with metals in root tissue. Accumulation of Cu in leaf tissue followed a linear relationship at lower sediment concentrations, with an exclusion or saturation mechanism at higher sediment concentrations. Lead showed little mobility to leaf tissue. Zn showed restricted accumulation in leaf tissue, which correlated with sediment concentrations. Decreases in sediment pH were found to increase Zn accumulation to root tissue. Increasing concentrations of Pb and Zn in sediments resulted in a greater accumulation of Pb to both root and leaf tissue. A. marina roots may be employed as a biological indicator of environmental exposure of Cu, Pb and Zn and leaves for Zn, with temporal monitoring.

  19. Survey of helminths, ectoparasites, and chytrid fungus of an introduced population of cane toads, Rhinella marina (Anura: Bufonidae), from Grenada

    Science.gov (United States)

    Drake, Michael C.; Zieger, Ulrike; Groszkowski, Andrew; Gallardo, Bruce; Sages, Patti; Reavis, Roslyn; Faircloth, Leslie; Jacobson, Krystin; Lonce, Nicholas; Pinckney, Rhonda D.; Cole, Rebecca Ann

    2014-01-01

    One hundred specimens of Rhinella marina, (Anura: Bufonidae) collected in St. George's parish, Grenada, from September 2010 to August 2011, were examined for the presence of ectoparasites and helminths. Ninety-five (95%) were parasitized by 1 or more parasite species. Nine species of parasites were found: 1 digenean, 2 acanthocephalans, 4 nematodes, 1 arthropod and 1 pentastome. The endoparasites represented 98.9% of the total number of parasite specimens collected. Grenada represents a new locality record for Mesocoelium monas, Raillietiella frenatus, Pseudoacanthacephalus sp., Aplectana sp., Physocephalus sp., Acanthacephala cystacanth, and Physalopteridae larvae. The digenean M. monas occurred with the highest prevalence of 82%, contrasting many studies of R. marina where nematodes dominate the parasite infracommunity. Female toads were found to have a significantly higher prevalence of Amblyomma dissimile than male toads. Only 2 parasites exhibited a significant difference between wet and dry season with Parapharyngodon grenadensis prevalence highest in the wet season and A. dissimile prevalence highest during the dry season. Additionally, A. dissimilewas significantly more abundant during the dry season.

  20. Characterization of a New Trioxilin and a Sulfoquinovosyl Diacylglycerol with Anti-Inflammatory Properties from the Dinoflagellate Oxyrrhis marina

    Directory of Open Access Journals (Sweden)

    Eun Young Yoon

    2017-02-01

    Full Text Available Two new compounds—a trioxilin and a sulfoquinovosyl diacylglycerol (SQDG—were isolated from the methanolic extract of the heterotrophic dinoflagellate Oxyrrhis marina cultivated by feeding on dried yeasts. The trioxilin was identified as (4Z,8E,13Z,16Z,19Z -7(S,10(S,11(S-trihydroxydocosapentaenoic acid (1, and the SQDG was identified as (2S-1-O-hexadecanosy-2-O-docosahexaenoyl-3-O-(6-sulfo-α-d-quinovopyranosyl-glycerol (2 by a combination of nuclear magnetic resonance (NMR spectra, mass analyses, and chemical reactions. The two compounds were associated with docosahexaenoic acid, which is a major component of O. marina. The two isolated compounds showed significant nitric oxide inhibitory activity on lipopolysaccharide-induced RAW264.7 cells. Compound 2 showed no cytotoxicity against hepatocarcinoma (HepG2, neuroblastoma (Neuro-2a, and colon cancer (HCT-116 cells, while weak cytotoxicity was observed for compound 1 against Neuro-2a cells.

  1. O tecer e o trajar: metáforas do empoderamento feminino em dois contos de Marina Colasanti

    Directory of Open Access Journals (Sweden)

    Enedir Silva Santos

    2015-12-01

    Full Text Available Os contos de Marina Colasanti transitam entre o real e o fantástico alinhavando ações que conduzem as relações humanas e seus dilemas. Suas narrativas curtas são retiradas das experiências diárias para suscitar reflexões muito mais abrangentes, pois são entrelaçados de palavras e situações que desvelam o cotidiano e o comportamento exigido da mulher. A partir da análise dos contos “A moça tecelã”, do livro Doze reis e a moça no labirinto do vento (1982, e “Plano matrimonial”, de Contos do amor rasgado (1982, evidenciamos de que forma a autora constrói, metaforicamente, na tessitura narrativa a roupa masculina e o trabalho da tecelã para refletir acerca do empoderamento da mulher. Os contos têm em comum a relação heterossexual das protagonistas intermediada pelos trajes masculinos, que se revestem de simbologia e revelam, no contexto literário, a explanação do lugar social da mulher e do homem, visto como uma das linhas que alinhavam a vivência humana. Desse modo, Marina Colasanti tece na trama discursiva as redes de significações reveladoras do fazer e do ser feminino.

  2. Characterization of a New Trioxilin and a Sulfoquinovosyl Diacylglycerol with Anti-Inflammatory Properties from the Dinoflagellate Oxyrrhis marina

    Science.gov (United States)

    Yoon, Eun Young; Yang, A. Reum; Park, Jaeyeon; Moon, Seung Joo; Jeong, Eun Ju; Rho, Jung-Rae

    2017-01-01

    Two new compounds—a trioxilin and a sulfoquinovosyl diacylglycerol (SQDG)—were isolated from the methanolic extract of the heterotrophic dinoflagellate Oxyrrhis marina cultivated by feeding on dried yeasts. The trioxilin was identified as (4Z,8E,13Z,16Z,19Z) -7(S),10(S),11(S)-trihydroxydocosapentaenoic acid (1), and the SQDG was identified as (2S)-1-O-hexadecanosy-2-O-docosahexaenoyl-3-O-(6-sulfo-α-d-quinovopyranosyl)-glycerol (2) by a combination of nuclear magnetic resonance (NMR) spectra, mass analyses, and chemical reactions. The two compounds were associated with docosahexaenoic acid, which is a major component of O. marina. The two isolated compounds showed significant nitric oxide inhibitory activity on lipopolysaccharide-induced RAW264.7 cells. Compound 2 showed no cytotoxicity against hepatocarcinoma (HepG2), neuroblastoma (Neuro-2a), and colon cancer (HCT-116) cells, while weak cytotoxicity was observed for compound 1 against Neuro-2a cells. PMID:28264430

  3. Phylogeny of Heterokonta: Incisomonas marina, a uniciliate gliding opalozoan related to Solenicola (Nanomonadea), and evidence that Actinophryida evolved from raphidophytes.

    Science.gov (United States)

    Cavalier-Smith, Thomas; Scoble, Josephine Margaret

    2013-08-01

    Environmental rDNA sequencing has revealed many novel heterokont clades of unknown morphology. We describe a new marine heterotrophic heterokont flagellate, Incisomonas marina, which most unusually lacks an anterior cilium. It glides and swims with its cilium trailing behind, but is predominantly sedentary on the substratum, with or without a cilium. 18S rDNA sequence phylogeny groups Incisomonas strongly within clade MAST-3; with others it forms a robust sister clade to Solenicola, here grouped with it as new order Uniciliatida, placed within new class Nanomonadea encompassing MAST-3. Our comprehensive maximum likelihood heterokont phylogeny shows Nanomonadea as sister to MAST-12 plus Opalinata within Opalozoa, and that Actinophryida are not Opalozoa (previously suggested by distance trees), but highly modified raphidomonads, arguably related to Heliorapha (formerly Ciliophrys) azurina gen., comb. n. We discuss evolution of Actinophryida from photosynthetic raphidophytes. Clades MAST-4,6-11 form one early-branching bigyran clade. Olisthodiscus weakly groups with Hypogyristea not Raphidomonadea. Phylogenetic analysis shows that MAST-13 is all Bicosoeca. Some gliding uniciliates similar to Incisomonas marina seem to have been misclassified: therefore we establish Incisomonas devorata comb. n. for Rigidomastix devoratum, revise the genus Rigidomastix, transfer Clautriavia parva to Kiitoksia. We make 17 new familes (13 heterokont (three algal), two cercozoan, two amoebozoan).

  4. Aureispira marina gen. nov., sp. nov., a gliding, arachidonic acid-containing bacterium isolated from the southern coastline of Thailand.

    Science.gov (United States)

    Hosoya, Shoichi; Arunpairojana, Vullapa; Suwannachart, Chatrudee; Kanjana-Opas, Akkharawit; Yokota, Akira

    2006-12-01

    Three strains of gliding bacteria, 24(T), 62 and 71, isolated from a marine sponge and algae from the southern coastline of Thailand, were studied using a polyphasic approach to clarify their taxonomic positions. A phylogenetic analysis based on 16S rRNA gene sequences showed that the three isolates formed a distinct lineage within the family 'Saprospiraceae' of the phylum Bacteroidetes and were related to members of the genus Saprospira. The G+C contents of the isolates were in the range 38-39 mol%. The major respiratory quinone was MK-7. The predominant cellular fatty acids were 20 : 4omega6c (arachidonic acid), 16 : 0 and iso-17 : 0. On the basis of morphological, physiological and chemotaxonomic characteristics, together with DNA-DNA hybridization data and 16S rRNA gene sequences, the isolates represent a novel species of a novel genus, for which the name Aureispira marina gen. nov., sp. nov. is proposed. The type strain of Aureispira marina is 24(T) (=IAM 15389(T)=TISTR 1719(T)).

  5. The Structure of Genetic Diversity in Eelgrass (Zostera marina L.) along the North Pacific and Bering Sea Coasts of Alaska

    Science.gov (United States)

    Talbot, Sandra; Sage, Kevin; Rearick, Jolene; Fowler, Megan C.; Muñiz-Salazar, Raquel; Baibak, Bethany; Wyllie-Echeverria, Sandy; Cabello-Pasini, Alehandro; Ward, David H.

    2016-01-01

    Eelgrass (Zostera marina) populations occupying coastal waters of Alaska are separated by a peninsula and island archipelago into two Large Marine Ecosystems (LMEs). From populations in both LMEs, we characterize genetic diversity, population structure, and polarity in gene flow using nuclear microsatellite fragment and chloroplast and nuclear sequence data. An inverse relationship between genetic diversity and latitude was observed (heterozygosity: R2 = 0.738, P < 0.001; allelic richness: R2 = 0.327, P = 0.047), as was significant genetic partitioning across most sampling sites (θ = 0.302, P < 0.0001). Variance in allele frequency was significantly partitioned by region only in cases when a population geographically in the Gulf of Alaska LME (Kinzarof Lagoon) was instead included with populations in the Eastern Bering Sea LME (θp = 0.128–0.172; P < 0.003), suggesting gene flow between the two LMEs in this region. Gene flow among locales was rarely symmetrical, with notable exceptions generally following net coastal ocean current direction. Genetic data failed to support recent proposals that multiple Zostera species (i.e. Z. japonica and Z. angustifolia) are codistributed with Z. marina in Alaska. Comparative analyses also failed to support the hypothesis that eelgrass populations in the North Atlantic derived from eelgrass retained in northeastern Pacific Last Glacial Maximum refugia. These data suggest northeastern Pacific populations are derived from populations expanding northward from temperate populations following climate amelioration at the terminus of the last Pleistocene glaciation.

  6. Antioxidant and antimicrobial activity of a mangrove plant Avicennia marina (Forsk. Pooja Moteriya, Ashish Dalsaniya, Sumitra Chanda*

    Directory of Open Access Journals (Sweden)

    Pooja Moteriya

    2015-09-01

    Full Text Available Objective: To evaluate the antioxidant and antimicrobial potential of different parts (leaf, stem and pneumatophore of a mangrove plant Avicennia marina (Forsk. Vierh (Avicenniaceae. Methods: The extraction was done by cold percolation method using solvents of hexane, ethyl acetate, acetone, methanol and water. Total phenol and flavonoid content were measured by Folin-Ciocalteu’s reagent and aluminium chloride colorimetric method respectively. The antioxidant activity was evaluated using antioxidant assays of 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity, superoxide radical scavenging assay, 2,2’-azino-bis-(3-ethyl benzothiazoline-6-sulfonic acid, ferric reducing antioxidant power and reducing capacity assessment. The antibacterial activity was done by agar well diffusion method against four Gram-positive, four Gram-negative bacteria and four fungi. Results: Different antioxidant assays showed different levels of activity in different parts and different solvent extracts. Overall, acetone extract of stem showed the best antioxidant activity. The Gram-positive bacteria were more susceptible than Gram-negative bacteria and fungi. Conclusions: The results indicated extract of Avicennia marina can be used as a promising source of natural antioxidant.

  7. In-situ Phytoremediation of PAH and PCB Contaminated Marine Sediments with Eelgrass (Zostera marina)

    Energy Technology Data Exchange (ETDEWEB)

    Huesemann, Michael H.; Hausmann, Tom S.; Fortman, Timothy J.; Thom, Ronald M.; Cullinan, Valerie I.

    2009-10-01

    In view of the fact that there are presently no cost-effective in-situ treatment technologies for contaminated sediments, a 60 week long phytoremediation feasibility study was conducted in seawater-supplied outdoor ponds to determine whether eelgrass (Zostera marina) is capable of removing polynuclear aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) from submerged marine sediments. It was determined that all PAHs and PCBs, independent of the number of aromatic rings and degree of chlorination, respectively, were removed to a much larger extent in planted sediments compared to unplanted controls. After 60 weeks of treatment, the concentration of total PAHs decreased by 73% in planted sediments but only 25% in unplanted controls. Similarly, total PCBs declined by 60% in the presence of plants while none were removed in the unplanted sediment. Overall, PAH and PCB biodegradation was greatest in the sediment layer that contained most of the eelgrass roots. Abiotic desorption tests conducted at week 32 confirmed that the phytoremediation process was not controlled by mass-transfer or bioavailability limitations since all PAHs and PCBs desorbed rapidly and to a large extent from the sediment. PAHs were detected in both roots and shoots, with root and shoot bioaccumulation factors for total PAHs amounting to approximately 3 and 1, respectively, after 60 weeks of phytoremediation treatment. Similarly, the root bioccumulation factor for total PCBs was around 4, while no PCBs were detected in the eelgrass leaves at the end of the experiment. The total mass fraction of PAHs and PCBs absorbed and translocated by plant biomass during the 60 week period was insignificant, amounting to less than 0.5% of the total mass of PAHs and PCBs which was initially present in the sediment. Finally, the number of total heterotrophic bacteria and hydrocarbon degraders was slightly but not statistically significantly greater in planted sediments than in unplanted controls

  8. Free and Bound Fatty-Acids and Hydroxy Fatty-Acids in the Living and Decomposing Eelgrass Zostera-Marina L

    NARCIS (Netherlands)

    De Leeuw, J.; Rijpstra, W.I.C.; Nienhuis, P.H.

    1995-01-01

    Very early diagenetic processes of free, esterified and amide or glycosidically bound fatty acids and hydroxy fatty acids present in well documented samples of living and decomposing eelgrass (Zostera marina L.) were investigated. Free and esterified fatty acids decreased significantly over a period

  9. Climate-linked mechanisms driving spatial and temporal variation in eelgrass (Zostera marina L.) growth and assemblage structure in Pacific Northwest estuaries, USA

    Energy Technology Data Exchange (ETDEWEB)

    Thom, Ronald M.; Southard, Susan L.; Borde, Amy B.

    2014-11-01

    Using laboratory experiments on temperature and leaf metabolism, and field data sets from Washington, between 1991 and 2013, we developed lines of evidence showing that variations in water temperature, mean sea level, and desiccation stress appear to drive spatial and temporal variations in eelgrass (Zostera marina).

  10. New evidence for habitat-specific selection in Wadden Sea Zostera marina populations revealed by genome scanning using SNP and microsatellite markers

    NARCIS (Netherlands)

    Oetjen, Katharina; Ferber, Steven; Dankert, Ilka; Reusch, Thorsten B. H.

    2010-01-01

    Eelgrass Zostera marina is an ecosystem-engineering species of outstanding importance for coastal soft sediment habitats that lives in widely diverging habitats. Our first goal was to detect divergent selection and habitat adaptation at the molecular genetic level; hence, we compared three pairs of

  11. Quest for minor but key chlorophyll molecules in photosynthetic reaction centers - unusual pigment composition in the reaction centers of the chlorophyll d-dominated cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Akiyama, Machiko; Miyashita, Hideaki; Kise, Hideo; Watanabe, Tadashi; Mimuro, Mamoru; Miyachi, Shigetoh; Kobayashi, Masami

    2002-01-01

    A short overview, based on our own findings, is given of the minor pigments that function as key components in photosynthesis. Recently, we found the presence of chlorophyll a, chlorophyll d' and pheophytin a as minor pigments in the chlorophyll d-dominated cyanobacterium Acaryochloris marina.

  12. MAPPING INTERTIDAL EELGRASS (ZOSTERA MARINA L.) IN THREE COASTAL ESTUARIES OF THE PACIFIC NORTHWEST USA USING FALSE-COLOUR NEAR-INFRARED AERIAL PHOTOGRAPHY

    Science.gov (United States)

    This study describes a hybrid technique of digitally classifying aerial photography used for mapping the intertidal habitat of eelgrass (Zostera marina L.) in Pacific Northwest USA estuaries. The large tidal range (2-3 m) in this region exposes most of this seagrass community at ...

  13. DESICCATION IS A LIMITING FACTOR FOR EELGRASS (ZOSTERA MARINA L.) DISTRIBUTION IN THE INTERTIDAL ZONE OF A NORTHEASTERN P{ACIFIC (USA) ESTUARY

    Science.gov (United States)

    Intertidal irradiance, temperature, and aerial exposure were measured for two years in intertidal Zostera marina beds located in Yaquina Bay (Newport, OR, USA). These physical data were correlated with plant growth and other metrics measured at intervals during the study. Pho...

  14. Comparison of non-indigenous dwarf eelgrass (Zostera japonica) and native eelgrass (Z. marina) distributions in a northeast Pacific estuary: 1997-2014

    Science.gov (United States)

    This study addressed the following question: In a coastal estuary of the northeastern Pacific Ocean with a relatively large areal extent of the native eelgrass Zostera marina, is an expanding distribution of the non-indigenous dwarf eelgrass Z. japonica accompanied by a measurab...

  15. MAPPING INTERTIDAL EELGRASS (ZOSTERA MARINA L.) IN THREE COASTAL ESTUARIES OF THE PACIFIC NORTHWEST USA USING FALSE-COLOUR NEAR-INFRARED AERIAL PHOTOGRAPHY

    Science.gov (United States)

    This study describes a hybrid technique of digitally classifying aerial photography used for mapping the intertidal habitat of eelgrass (Zostera marina L.) in Pacific Northwest USA estuaries. The large tidal range (2-3 m) in this region exposes most of this seagrass community at ...

  16. Free and Bound Fatty-Acids and Hydroxy Fatty-Acids in the Living and Decomposing Eelgrass Zostera-Marina L

    NARCIS (Netherlands)

    De Leeuw, J.; Rijpstra, W.I.C.; Nienhuis, P.H.

    1995-01-01

    Very early diagenetic processes of free, esterified and amide or glycosidically bound fatty acids and hydroxy fatty acids present in well documented samples of living and decomposing eelgrass (Zostera marina L.) were investigated. Free and esterified fatty acids decreased significantly over a period

  17. Strain variability in fatty acid composition of Chattonella marina (Raphidophyceae) and its relation to differing ichthyotoxicity toward rainbow trout gill cells.

    Science.gov (United States)

    Dorantes-Aranda, Juan José; Nichols, Peter D; David Waite, Trevor; Hallegraeff, Gustaaf M

    2013-04-01

    Lipid profiles of three strains (Mexico, Australia, Japan) of Chattonella marina (Subrahmanyan) Hara et Chihara were studied under defined growth (phosphate, light, and growth phase) and harvest (intact and ruptured cells) conditions. Triacylglycerol levels were always 51% of total lipids). The major fatty acids in C. marina were palmitic (16:0), eicosapentaenoic (EPA, 20:5ω3), octadecatetraenoic (18:4ω3), myristic (14:0), and palmitoleic (16:1ω7c) acids. Higher levels of EPA were found in ruptured cells (21.4-29.4%) compared to intact cells (8.5-25.3%). In general, Japanese N-118 C. marina was the highest producer of EPA (14.3-29.4%), and Mexican CMCV-1 the lowest producer (7.9-27.1%). Algal cultures, free fatty acids from C. marina, and the two aldehydes 2E,4E-decadienal and 2E,4E-heptadienal (suspected fatty acid-derived products) were tested against the rainbow trout fish gill cell line RTgill-W1. The configuration of fatty acids plays an important role in ichthyotoxicity. Free fatty acid fractions, obtained by base saponification of total lipids from C. marina showed a potent toxicity toward gill cells (median lethal concentration, LC50 (at 1 h) of 0.44 μg · mL(-1) in light conditions, with a complete loss of viability at >3.2 μg · mL(-1) ). Live cultures of Mexican C. marina were less toxic than Japanese and Australian strains. This difference could be related to differing EPA content, superoxide anion production, and cell fragility. The aldehydes 2E,4E-decadienal and 2E,4E-heptadienal also showed high impact on gill cell viability, with LC50 (at 1 h) of 0.34 and 0.36 μg · mL(-1) , respectively. Superoxide anion production was highest in Australian strain CMPL01, followed by Japanese N-118 and Mexican CMCV-1 strains. Ruptured cells showed higher production of superoxide anion compared to intact cells (e.g., 19 vs. 9.5 pmol · cell(-1)  · hr(-1) for CMPL01, respectively). Our results indicate that C. marina is more ichthyotoxic

  18. Biogeografía marina de Chile continental Marine biogeography of continental Chile

    Directory of Open Access Journals (Sweden)

    PATRICIO A. CAMUS

    2001-09-01

    Full Text Available Por casi un siglo, varios autores han analizado los patrones de distribución de la fauna y flora marina del Pacífico de Sudamérica y de la costa de Chile en particular, con el propósito de establecer el número de las unidades biogeográficas presentes. Si bien los patrones generales actuales son relativamente bien conocidos, la mayoría de los estudios se ha enfocado en las discontinuidades distribucionales y en propuestas de clasificación más que en los factores y procesos dinámicos que han formado las unidades espaciales identificadas. Aun en el caso de las clasificaciones, las conclusiones publicadas se basan principalmente en el análisis de uno o pocos grupos seleccionados, y presentan diferencias importantes en los criterios de selección de los grupos, el número de especies involucrado y la metodología usada. Por otra parte, las discrepancias entre estudios específicos tienden a obscurecer un fenómeno relevante y de mayor escala como es la dinámica de las biotas, uno de los aspectos biogeográficos menos conocidos en Chile. En tal contexto, este trabajo presenta una revisión de literatura sobre la biogeografía marina de Chile y sus aspectos asociados, con los siguientes objetivos: (a resumir las características oceanográficas, climáticas y geomorfológicas de la costa continental de Chile; (b discutir 27 clasificaciones biogeográficas publicadas para la costa chilena, analizando los criterios y procedimientos usados por los autores, sus conclusiones principales, y la concordancia entre los estudios; (c evaluar los procesos dispersivos y vicariantes asociados a los desplazamientos y modificaciones de las biotas de la región, en función de los antecedentes disponibles sobre las condiciones existentes y los principales eventos ocurridos durante los períodos Terciario y Cuaternario; y (d proponer un escenario de cambio biogeográfico basado en determinantes históricas y su influencia en la formación, carácter y din

  19. 海洋尖尾藻培养液的基本特征%Basic Features of the Culture Medium of Oxyrrhis marina

    Institute of Scientific and Technical Information of China (English)

    安鑫龙; 李雪梅; 李亚宁

    2012-01-01

    [目的]研究海洋尖尾藻培养液的基本特征.[方法]以亚心形扁藻(Platymoras subcordiformis)和米氏凯伦藻(Karernia mikimotoi)作为海洋尖尾藻(Oxyrrhis marina)的饵料进行室内静置培养.[结果]海洋尖尾藻静王培养过程中培养液颜色发生变化,先由饵料藻培养液的颜色变为淡粉红色至粉红色,最终变为无色.海洋尖尾藻培养过程中瓶底首先出现少量沉淀物,随着培养时间延长,沉淀物上附着的饵料藻开始逐渐增多然后慢慢减少直至消失.[结论]该研究获得了海洋尖尾藻培养液的基本牲征,为海洋尖尾藻生态学研究提供了参考.%[ Objective ] To study the basic features of the culture medium of Oxyrrhis marina. [ Method ] The Oxyrrhis marina was indoor cultured with the baits of Platymonas subcordiformis and Karenia mikimotoi. [Result] During the static culture process, the color of the culture medium of Oxyrrhis marina changed firstly from light pink to pink and finally to colorless. Some precipitate appeared at the bottle bottom, with the extending culture time, the bait algae attached to the precipitate gradually increased, then decreased and finally disappeared. [ Conclusion] The study provides references for the screening of the culture medium of Oxyrrhis marina and realizes its long-term culture.

  20. Quantitative PCR reveals strong spatial and temporal variation of the wasting disease pathogen, Labyrinthula zosterae in northern European eelgrass (Zostera marina beds.

    Directory of Open Access Journals (Sweden)

    Anna-Christina Bockelmann

    Full Text Available Seagrass beds are the foundation species of functionally important coastal ecosystems worldwide. The world's largest losses of the widespread seagrass Zostera marina (eelgrass have been reported as a consequence of wasting disease, an infection with the endophytic protist Labyrinthula zosterae. During one of the most extended epidemics in the marine realm, ∼90% of East and Western Atlantic eelgrass beds died-off between 1932 and 1934. Today, small outbreaks continue to be reported, but the current extent of L. zosterae in European meadows is completely unknown. In this study we quantify the abundance and prevalence of the wasting disease pathogen among 19 Z. marina populations in northern European coastal waters, using quantitative PCR (QPCR with primers targeting a species specific portion of the internally transcribed spacer (ITS1 of L. zosterae. Spatially, we found marked variation among sites with abundances varying between 0 and 126 cells mg(-1 Z. marina dry weight (mean: 5.7 L. zosterae cells mg(-1 Z. marina dry weight ±1.9 SE and prevalences ranged from 0-88.9%. Temporarily, abundances varied between 0 and 271 cells mg(-1 Z. marina dry weight (mean: 8.5±2.6 SE, while prevalences ranged from zero in winter and early spring to 96% in summer. Field concentrations accessed via bulk DNA extraction and subsequent QPCR correlated well with prevalence data estimated via isolation and cultivation from live plant tissue. L. zosterae was not only detectable in black lesions, a sign of Labyrinthula-induced necrosis, but also occurred in green, apparently healthy tissue. We conclude that L. zosterae infection is common (84% infected populations in (northern European eelgrass populations with highest abundances during the summer months. In the light of global climate change and increasing rate of marine diseases our data provide a baseline for further studies on the causes of pathogenic outbreaks of L. zosterae.

  1. REPETITION AS A SPECIAL TYPE OF SYNTACTIC RELATIONS IN REPRESENTED SPEECH: BASED ON THE PROSE BY MARINA TSVETAEVA

    Directory of Open Access Journals (Sweden)

    Olga Pavlovna Puchinina

    2017-03-01

    Full Text Available The author studies the peculiarities of repetition, being one of the ways to build syntactic relations in the represented speech structure, based on the prose by Marina Tsvetaeva. The article describes the different types of repetitions, their distinctive features and frequency of usage in the studied tests. The author describes different types of repetitions in the studied cases of represented speech from the point of view of their position. Repetition occurs at the beginning, end of sentences, beginning and end of a statement or paragraph, end of a statement and beginning of the next one; lexical items may be repeated in the middle of a statement. The morphology of repetitions, i.e., the way by what parts of speech the repeated words and structures are expressed, is of interest from the point of view of functional grammar. The author notes that Tsvetaeva repeats different parts of speech: conjunctions, prepositions, particles, nouns, pronouns, adverbs, numerals, verbs, modal words or a combination of two words. Moreover, due to her special intention, Tsvetaeva intensifies repetition through particular phonetic devices, such as alliteration, rhyme and rhythm, which make her prosaic works sound poetic. Purpose. The article is devoted to the topic of rendering another person’s speech, as it continues to be one of the most important issues of modern linguistics. The subject of analysis is repetition and its different types in the structure of represented speech on the material of prose texts by Marina Tsvetaeva. The author’s aims is to reveal the way these types of repetition (lexical, syntactic, semantic ones function in the structure of represented speech and what effect is achieved with their help. Methodology. The research has been conducted using the continuous sampling method and the quantitative estimation method, aimed to identify the frequency of using different types of repetition and repeated parts of speech and constructions in the

  2. Innovación docente en las asignaturas de Biología Marina y Zoología Marina: aprendizaje basado en problemas y trabajo en pequeños grupos

    OpenAIRE

    Guerra García, José Manuel; Corzo Toscano, Juan; Espinosa Torre, Free; García Gómez, José Carlos

    2012-01-01

    El inicio del grado de Biología en la Universidad de Sevilla modifica sustancialmente la organización de los estudios universitarios, pasando de licenciatura de 5 años a grado de 4 años. Ello supone la desaparición de la asignatura optativa “Biología Marina” y la de libre configuración “Zoología Marina”. Por tanto, el futuro del mantenimiento de la línea docente en Biología Marina en la Universidad de Sevilla dependerá del desarrollo de un máster. De este modo, en la asignat...

  3. Rezension von: Karl Lenz, Marina Adler: Geschlechterverhältnisse. Einführung in die sozialwissenschaftliche Geschlechterforschung Band 1. Weinheim u.a.: Juventa Verlag 2010. — Karl Lenz, Marina Adler: Geschlechterbeziehungen. Weinheim u.a.: Juventa Verlag 2011.

    Directory of Open Access Journals (Sweden)

    Heike Kahlert

    2012-03-01

    Full Text Available Karl Lenz und Marina Adler orientieren sich in ihrem zweibändigen Lehrbuch zur sozialwissenschaftlichen Geschlechterforschung an der etablierten Unterscheidung zwischen Makro- und Mikrosoziologie. Im ersten Band werden theoretische Perspektiven der Geschlechterforschung und unterschiedliche Zusammenhänge zu Kultur nachgezeichnet sowie zentrale Themenfelder einer Sozialstrukturanalyse der Geschlechterordnung fokussiert, nämlich Recht, Politik, Bildung und Arbeit. Im zweiten Band stehen neben der Sozialisation ausgewählte Erträge der mikrosoziologischen Geschlechterforschung im Zentrum, nämlich Körper, Sexualität, persönliche Beziehungen, Devianz und Gewalt. In dieser überfälligen, informativen, sorgfältig recherchierten, aber auch vergleichsweise traditionellen und empirisch orientierten Einführung wird die Geschlechterforschung zwar in einer breiteren Diversity-Forschung verortet, das Verhältnis von Diversität und Geschlecht leider aber nicht reflektiert.

  4. ANÁLISIS ESPECTRAL DE OLAS MARINAS: MODELOS UNIVARIADOS // SPECTRAL ANALYSIS OF WAVE SEA: UNIVARIATE MODELS

    Directory of Open Access Journals (Sweden)

    Nestor Escudero Mora

    2015-12-01

    Full Text Available El análisis espectral, es el proceso técnico de la descomposición de una señal compleja en partes más simples. Muchos procesos físicos se describen mejor como una suma de muchas componentes de frecuencias individuales, alternativamente una señal puede dividirse en segmentos cortos y el análisis del espectro puede aplicarse a estos segmentos individuales. Desde el punto de vista del estudio de olas marinas, el espectro juega un rol fundamental y es interpretado como la energía presente en la serie de tiempo durante el periodo. Este estudio se basa en el análisis del espectro asociado a datos del mar del Norte en el ano de 1999 en la plataforma North Alwyn almacenados en la Universidad Heriot-Watt de Edimburgo, separados en periodos de 20 minutos, el total a estudiar son 244 periodos. Para ello, se determinó que existe información que no aporta al problema, representa ruido y es el 3% de la energía, la cual no fue tomada para el estudio. Se dividió el espectro en 12 subintervalos y se ajustaron modelos autorregresivos bajo el esquema de Box-Jenskin and Reinsel, estudiados estos hasta encontrar la mejor aproximación posible para cada subintervalo mediante las propiedades estadísticas obtenidas por cada modelo, junto con los pronósticos respectivos. // ABSTRACT: Spectral analysis is the technical process of a complex signal decomposition into simpler parts. Many physical processes are better described as a sum of many individual frequency components; alternatively a signal can be divided into short segments and the spectrum analysis can be applied to these individual segments. From the point of view of the study of Waves Sea, the spectrum plays a vital role and it is interpreted as the energy in the time series during the period. This study is based on analysis of the spectrum associated to data from the North Sea in the year of 1999, taken in North Alwyn platform, stored in the Heriot-Watt University in Edinburgh, separated in

  5. EL IMPACTO DE LA AGRICULTURA INTENSIVA EN EL USO TURÍSTICO DE LAS PLAYAS DE MARINA DE COPE (MURCIA

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    F. Belmonte Serrato

    2011-01-01

    Full Text Available El desarrollo de la agricultura intensiva y, especialmente, la ocupación agrícola de los fondos de las ramblas, ha ocasionado un desequilibrio sedimentario en las playas de Marina de COPE. Los retrocesos de la línea de costa oscilan entre 16 y 68 m y la disminución de la superficie se estima en un 50% de la correspondiente a 1956. Esto, ha reducido su capacidad de carga potencial que, para una intensidad de uso de 25 m2/usuario, ha pasado de 4.400 usuarios potenciales por día a 2.200. Lo que implica, para los meses de uso de estas playas, julio y agosto, una pérdida de capacidad de 130.000 usuarios.

  6. Accumulation of trace metals in grey mangrove Avicennia marina fine nutritive roots: the role of rhizosphere processes.

    Science.gov (United States)

    Chaudhuri, Punarbasu; Nath, Bibhash; Birch, Gavin

    2014-02-15

    Mangrove sediment has long been recognized as being important in restricting the mobility of contaminants in estuarine environments. To investigate the role of rhizosphere processes in the accumulation of trace metals in mangrove fine nutritive roots, the mangrove sediments and associated fine nutritive roots are collected from five major embayments of Sydney estuary (Australia) for geochemical studies. In this estuary Avicennia marina sediments are accumulating large quantities of trace metals due to presence of abundant fine sediment (trace metals in fine nutritive roots responds to total sediment chemistry mainly due to rhizosphere sediment geochemical processes resulting in a strong linear correlation between metal concentrations in fine nutritive roots vs. total and bio-available contents in sediments. Accumulation of trace metals in fine nutritive roots is almost always exceeds rhizosphere total sediment metal concentrations. Copyright © 2013 Elsevier Ltd. All rights reserved.

  7. Preservar, demolir, construir ou ocupar a creche Ninho Jardim Condessa Marina R. Crespi: de todos os riscos, o risco

    Directory of Open Access Journals (Sweden)

    Verônica Sales Pereira

    2016-04-01

    Full Text Available Resumo Este artigo aborda a interrelação entre o patrimônio cultural industrial e o território urbano através dos processos de patrimonialização e de ocupação pela população sem-teto da creche Ninho Jardim Condessa Marina R. Crespi, no bairro da Mooca, em São Paulo. Analisaremos esses processos à luz da problematização das noções de risco, perda, demolição e mercado desenvolvidas por J. R. Gonçalves, entendendo-as como o avesso do patrimônio cultural, bem como de sua vinculação aos processos de gentrificação urbana. Para este fim, baseamo-nos na análise de documentos e na realização de entrevistas qualitativas.

  8. The MARINA Risk Assessment Strategy: A Flexible Strategy for Efficient Information Collection and Risk Assessment of Nanomaterials

    Directory of Open Access Journals (Sweden)

    Peter M. J. Bos

    2015-11-01

    Full Text Available An engineered nanomaterial (ENM may actually consist of a population of primary particles, aggregates and agglomerates of various sizes. Furthermore, their physico-chemical characteristics may change during the various life-cycle stages. It will probably not be feasible to test all varieties of all ENMs for possible health and environmental risks. There is therefore a need to further develop the approaches for risk assessment of ENMs. Within the EU FP7 project Managing Risks of Nanoparticles (MARINA a two-phase risk assessment strategy has been developed. In Phase 1 (Problem framing a base set of information is considered, relevant exposure scenarios (RESs are identified and the scope for Phase 2 (Risk assessment is established. The relevance of an RES is indicated by information on exposure, fate/kinetics and/or hazard; these three domains are included as separate pillars that contain specific tools. Phase 2 consists of an iterative process of risk characterization, identification of data needs and integrated collection and evaluation of data on the three domains, until sufficient information is obtained to conclude on possible risks in a RES. Only data are generated that are considered to be needed for the purpose of risk assessment. A fourth pillar, risk characterization, is defined and it contains risk assessment tools. This strategy describes a flexible and efficient approach for data collection and risk assessment which is essential to ensure safety of ENMs. Further developments are needed to provide guidance and make the MARINA Risk Assessment Strategy operational. Case studies will be needed to refine the strategy.

  9. Population demography and global sensitivity analysis of Avicennia marina on the eastern and western coasts of Saudi Arabia

    Directory of Open Access Journals (Sweden)

    Mohamed Elhag

    2015-03-01

    Full Text Available Mangrove ecosystems are one of the habitats that host high environmental diversity at the level of physical, geomorphological and biological features in arid regions. In Saudi Arabia, mangrove ecosystems are heavily threatened by both natural hazards and human pressure. The total estimated area of mangroves in Safwa Al Khurais, Saudi Arabia, is approximately 20 000 ha in extent and comprises two species: Avicennia marina and Rhizophora mucronata. They supply detritus to the marine food web and play a significant role in the conservation of biological diversity. The main objective of this study was to analyse the demographic population sensitivity of A. marina in two representative sites on the Red Sea and the eastern coast of Saudi Arabia. A sensitivity analysis was used to assess the contributions of the inputs to the total uncertainty in the analysis outcomes. Demographic features affecting mangroves in Saudi Arabia are complex and include various aspects. The phenological phase, tree size, density, cover, number of dead trees and pneumatophore characteristics were considered in this study. A comparative analysis of Gaussian process emulators for performing a global sensitivity analysis was used to conduct a variance-based sensitivity analysis to identify which uncertain inputs drive the output uncertainty. The results showed that the interconnections between different demographic features were predictable, but that the extent of the sensitivity was uncertain. Findings from the current study are anticipated to contribute significantly towards an inclusive mangrove demographic features assessment, and towards the subsequent conservation of mangroves in Saudi Arabia.Conservation implications: The findings of the current research are discussed in light of the application of sensitivity analyses outputs in the conservation and management of mangrove ecosystems at a national level

  10. Population genetic structure of eelgrass (Zostera marina) on the Korean coast: Current status and conservation implications for future management.

    Science.gov (United States)

    Kim, Jae Hwan; Kang, Ji Hyoun; Jang, Ji Eun; Choi, Sun Kyeong; Kim, Min Ji; Park, Sang Rul; Lee, Hyuk Je

    2017-01-01

    Seagrasses provide numerous ecosystem services for coastal and estuarine environments, such as nursery functions, erosion protection, pollution filtration, and carbon sequestration. Zostera marina (common name "eelgrass") is one of the seagrass bed-forming species distributed widely in the northern hemisphere, including the Korean Peninsula. Recently, however, there has been a drastic decline in the population size of Z. marina worldwide, including Korea. We examined the current population genetic status of this species on the southern coast of Korea by estimating the levels of genetic diversity and genetic structure of 10 geographic populations using eight nuclear microsatellite markers. The level of genetic diversity was found to be significantly lower for populations on Jeju Island [mean allelic richness (AR) = 1.92, clonal diversity (R) = 0.51], which is located approximately 155 km off the southernmost region of the Korean Peninsula, than for those in the South Sea (mean AR = 2.69, R = 0.82), which is on the southern coast of the mainland. South Korean eelgrass populations were substantially genetically divergent from one another (FST = 0.061-0.573), suggesting that limited contemporary gene flow has been taking place among populations. We also found weak but detectable temporal variation in genetic structure within a site over 10 years. In additional depth comparisons, statistically significant genetic differentiation was observed between shallow (or middle) and deep zones in two of three sites tested. Depleted genetic diversity, small effective population sizes (Ne) and limited connectivity for populations on Jeju Island indicate that these populations may be vulnerable to local extinction under changing environmental conditions, especially given that Jeju Island is one of the fastest warming regions around the world. Overall, our work will inform conservation and restoration efforts, including transplantation for eelgrass populations at the southern tip of

  11. Consumers' risk elimination in fuel supply chain. The Attica's Marinas yacht fuelling case study

    Energy Technology Data Exchange (ETDEWEB)

    Liapis, Nikolaos [ELINOIL-HELLENIC PETROLEUM COMPANY, S.A., Kifisia (Greece); Zannikos, Fanourios [National Technical Univ. of Athens (Greece). Lab. of Fuels Technology and Lubricants

    2013-06-01

    Oil products distribution system is a complicated supply chain and includes a lot of uncertainties. A limited but quite interesting part of this system is yachting supply in marinas. Yachts usually are equipped with high efficiency and big horsepower modem engines; sea travelling is risky itself so fuel quality contributes significant in safety; many of the yachts are chartered for hired cruises and so operators have the right to purchase tax-free marine diesel, which creates conditions for smuggling and adulteration. All above create a great need for quality control in these fuels, as Greek oil companies do not apply at the moment Total Quality Management (TQM) for securing both quality specifications and quantity paid by the end user. In this research project the Laboratory of Fuel Technology and Lubricants of NTUA collected samples and analysed fuels delivered by tank trucks to yachts in six marinas in the district of Attica. These fuels were marketed by ELINOIL SA, a medium size oil distribution company, operating in Greece. ELINOIL has a market share of 6% of the Greek fuel market but is a market leader in yachting supply in Attica, having more than 50% of the specific market. Problems concerning fuel quality were analysed, direct or indirect causes were tracked, recorded and analysed, always in comparison with data from other Quality Control procedures applied from the company. A specially developed database was updated with facts and figures from incidents and quality issues covering this activity of the company during this period. The project, as it was targeted, detected the quality problems of the specific supply chain and ended to suggestions concerning the building of Quality Assurance System in yachting fuel supply. (orig.)

  12. Molecular mechanisms that underlie the sexual stimulant actions of Avicennia marina (Forssk.) Vierh. and Crocus sativus L.

    Science.gov (United States)

    Al-Rehaily, Adnan Jathlan; Alhowiriny, Tawfeq Abdullah; El-Tahir, Kamal Eh; Al-Taweel, Areej Mohammad; Perveen, Shagufta

    2015-01-01

    The effects of extracts and sub-fractions of Avicennia marina, Crocus sativus and sildenafil on the sexual behavior of male rats and their effects on the intracavernosal pressure (I.CV), intracavernosal cyclic GMP and dihydrotestosterone plasma level were examined. The sexual behavior was followed for four hours using infra-red video cameras to quantify the effects on various male sexual behaviors. The results revealed that the active sub-fraction in case of A. marina was the hexane fraction of the chloroform extracts (C/H) whereas that of C. sativus was the hexane fraction of the alcoholic extract (A/H). (C/H), (A/H) and sildenafil significantly increased the total sexual stimulation index from 53.8±2.7 (control) to 406±7.8, 225±4 and 401±30.1, respectively (P<0.001, N=6). They significantly increased the index of successful mounting and ejaculation from 2.6±0.5 (control) to 40±2.7, 21±2.3 and 18±1.7, respectively (P<0.01, N=6). They significantly increased the cyclic GMP level from 0.94±0.07 (control) to 3.1±0.13, 1.59±0.11 and 3.66±0.19 ng/mg wet tissue, respectively (P<0.05, N=7). They did not affect dihydrotestosterone plasma level. (C/H), (A/H) and sildenafil increased the (I.CV) pressure by 4.8±0.3, 1.4±0.8 and 4.2±0.9 mmHg. The (C/H) seemed to be more active than sildenafil and twice active than (A/H). Both extracts and sildenafil acted via an increase in cyclic GMP.

  13. A combination of dynamic light scattering and polarized resonance Raman scattering applied in the study of Arenicola Marina extracellular hemoglobin.

    Science.gov (United States)

    Jernshøj, K D; Hassing, S; Olsen, L F

    2013-08-14

    Arenicola Marina extracellular hemoglobin (Hbl Hb) is considered to be a promising candidate as a blood substitute. To entangle some of the properties of extracellular giant hexagonal bilayer hemoglobin (Hbl Hb) of Arenicola Marina, we combined polarized resonance Raman scattering (532 nm excitation) with dynamic light scattering (DLS) (632.8 nm). An analysis of the depolarization ratio of selected a(2g) skeletal modes of the heme in native Hbl Hb and porcine Hb, shows that the distortion of the heme group away from its ideal fourfold symmetry is much smaller for heme groups bound in the Hbl Hb than for heme groups bound in porcine Hb. Using DLS, the average hydrodynamic diameter () of Hbl Hb was measured at pH = 5, 7, 8, 9, and 10. At pH = 5 to 7, the Hbl Hb was found in its native form with equal to 24.2 nm, while at pH = 8 and 9, a dissociation process starts to take place resulting in = 9 nm. At pH = 10, only large aggregates of fragmented Hbl Hb with larger than 1000 nm was detected, however, a comparison of the DLS results with the polarized resonance Raman scattering (RRS) revealed that the coupling between the fragments did not involve direct interaction between the heme groups, but also that the local heme environment seems to be comparable in the aggregates and in the native Hbl Hb. By comparing the unpolarized RRS results obtained for erythrocytes (RBC) with those for Hbl Hb, led us to the important conclusion that Hbl Hb is much easier photolyzed than porcine RBC.

  14. Population genetic structure of eelgrass (Zostera marina) on the Korean coast: Current status and conservation implications for future management

    Science.gov (United States)

    Kim, Jae Hwan; Kang, Ji Hyoun; Jang, Ji Eun; Choi, Sun Kyeong; Kim, Min Ji; Park, Sang Rul; Lee, Hyuk Je

    2017-01-01

    Seagrasses provide numerous ecosystem services for coastal and estuarine environments, such as nursery functions, erosion protection, pollution filtration, and carbon sequestration. Zostera marina (common name “eelgrass”) is one of the seagrass bed-forming species distributed widely in the northern hemisphere, including the Korean Peninsula. Recently, however, there has been a drastic decline in the population size of Z. marina worldwide, including Korea. We examined the current population genetic status of this species on the southern coast of Korea by estimating the levels of genetic diversity and genetic structure of 10 geographic populations using eight nuclear microsatellite markers. The level of genetic diversity was found to be significantly lower for populations on Jeju Island [mean allelic richness (AR) = 1.92, clonal diversity (R) = 0.51], which is located approximately 155 km off the southernmost region of the Korean Peninsula, than for those in the South Sea (mean AR = 2.69, R = 0.82), which is on the southern coast of the mainland. South Korean eelgrass populations were substantially genetically divergent from one another (FST = 0.061–0.573), suggesting that limited contemporary gene flow has been taking place among populations. We also found weak but detectable temporal variation in genetic structure within a site over 10 years. In additional depth comparisons, statistically significant genetic differentiation was observed between shallow (or middle) and deep zones in two of three sites tested. Depleted genetic diversity, small effective population sizes (Ne) and limited connectivity for populations on Jeju Island indicate that these populations may be vulnerable to local extinction under changing environmental conditions, especially given that Jeju Island is one of the fastest warming regions around the world. Overall, our work will inform conservation and restoration efforts, including transplantation for eelgrass populations at the southern

  15. Aerobic scope and cardiovascular oxygen transport is not compromised at high temperatures in the toad Rhinella marina.

    Science.gov (United States)

    Overgaard, Johannes; Andersen, Jonas L; Findsen, Anders; Pedersen, Pil B M; Hansen, Kasper; Ozolina, Karlina; Wang, Tobias

    2012-10-15

    Numerous recent studies convincingly correlate the upper thermal tolerance limit of aquatic ectothermic animals to reduced aerobic scope, and ascribe the decline in aerobic scope to failure of the cardiovascular system at high temperatures. In the present study we investigate whether this 'aerobic scope model' applies to an air-breathing and semi-terrestrial vertebrate Rhinella marina (formerly Bufo marinus). To quantify aerobic scope, we measured resting and maximal rate of oxygen consumption at temperatures ranging from 10 to 40°C. To include potential effects of acclimation, three groups of toads were acclimated chronically at 20, 25 and 30°C, respectively. The absolute difference between resting and maximal rate of oxygen consumption increased progressively with temperature and there was no significant decrease in aerobic scope, even at temperature immediately below the lethal limit (41-42°C). Haematological and cardiorespiratory variables were measured at rest and immediately after maximal activity at benign (30°C) and critically high (40°C) temperatures. Within this temperature interval, both resting and active heart rate increased, and there was no indication of respiratory failure, judged from high arterial oxygen saturation, P(O2) and [Hb(O2)]. With the exception of elevated resting metabolic rate for cold-acclimated toads, we found few differences in the thermal responses between acclimation groups with regard to the cardiometabolic parameters. In conclusion, we found no evidence for temperature-induced cardiorespiratory failure in R. marina, indicating that maintenance of aerobic scope and oxygen transport is unrelated to the upper thermal limit of this air-breathing semi-terrestrial vertebrate.

  16. Patterns of Genetic Variability in Island Populations of the Cane Toad (Rhinella marina) from the Mouth of the Amazon

    Science.gov (United States)

    Bessa-Silva, Adam Rick; Vallinoto, Marcelo; Sodré, Davidson; da Cunha, Divino Bruno; Hadad, Dante; Asp, Nils Edvin; Sampaio, Iracilda; Schneider, Horacio; Sequeira, Fernando

    2016-01-01

    The Amazonian coast has several unique geological characteristics resulting from the interaction between drainage pattern of the Amazon River and the Atlantic Ocean. It is one of the most extensive and sedimentologically dynamic regions of the world, with a large number of continental islands mostly formed less than 10,000 years ago. The natural distribution of the cane toad (Rhinella marina), one of the world’s most successful invasive species, in this complex Amazonian system provides an intriguing model for the investigation of the effects of isolation or the combined effects of isolation and habitat dynamic changes on patterns of genetic variability and population differentiation. We used nine fast-evolving microsatellite loci to contrast patterns of genetic variability in six coastal (three mainlands and three islands) populations of the cane toad near the mouth of the Amazon River. Results from Bayesian multilocus clustering approach and Discriminant Analyses of Principal Component were congruent in showing that each island population was genetically differentiated from the mainland populations. All FST values obtained from all pairwise comparisons were significant, ranging from 0.048 to 0.186. Estimates of both recent and historical gene flow were not significantly different from zero across all population pairs, except the two mainland populations inhabiting continuous habitats. Patterns of population differentiation, with a high level of population substructure and absence/restricted gene flow, suggested that island populations of R. marina are likely isolated since the Holocene sea-level rise. However, considering the similar levels of genetic variability found in both island and mainland populations, it is reliable to assume that they were also isolated for longer periods. Given the genetic uniqueness of each cane toad population, together with the high natural vulnerability of the coastal regions and intense human pressures, we suggest that these

  17. FACILITIES PLANNING WORKSHOP FOR BLASTING SUPPORT THE ACTIVITY OF DEVELOPMENT AND REPAIR SHIP IN PT. JASA MARINA INDAH UNIT II

    Directory of Open Access Journals (Sweden)

    Samuel Samuel

    2012-07-01

    Full Text Available Blasting in the process of planning the workshop production of new building and ship repair to play a role in providing blasting and paint on the block that will be of erection. As a result of blasting workshop facilities that do not have resulted in low production capacity that can be achieved by this workshop, namely three block ships per month. Capacity blasting and paint shop in this low resulted in low productivity process stage (stage the previous workshops which of course result in a decrease in vessel productivity in general.                 In penelitiaan aims to plan for blasting and paint shop facility which has been adjusted to the planned production capacity of PT. JASA MARINA INDAH II units.                 In this study it - thing to note is to understand the data - the data field for research conducted in terms of both technical and economic terms, with the blasting and paint shop facilities on the construction or repair of ships that have been planned, then the effectiveness of the work and production flow at. Jasa Marina Indah II units can be known.                 Based on the analysis and calculation of both technical and economical it can be identified by the workshop on the process of blasting Blasting efficiency is obtained for 2.55 hours, at 10.16 hours during the painting process, while economical in terms of labor costs can be reduced blasting cost is Rp.930000    for          paint       and         Rp.1.23million

  18. The experimental studies of influence of hydrogen sulfide on species of eelgrass (Zostera japonica and Zostera marina) in Padilla Bay, coastal waters of southeast Alaska conducted from 2013-06-01 to 2013-09-30 (NCEI Accession 0137907)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Two species of eelgrass can be found in Padilla Bay, Washington (Zostera japonica and Zostera marina) and act as a bioindicators of ecosystem health. Many factors...

  19. Effects of Hydrogen Sulfide (H2S) on Z. marina seedlings, seed germination and shoot density from 2013-01-16 to 2015-09-11 (NCEI Accession 0156588)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Multiple experiments were conducted to determine the effects hydrogen sulfide had on seedlings and seed germination in the seagrass Zostera marina. One study...

  20. Vegetación marina en la elaboración de bloques multinutritivos para la alimentación de rumiantes

    Directory of Open Access Journals (Sweden)

    Arturo F. Castellanos Ruelas

    2010-01-01

    así como sus interacciones. Los resultados indicaron que la vegetación marina tuvo un elevado contenido en proteína y en materia mineral. Al incrementar la melaza en la formulación arriba del 35 % ó el CaOH más allá del 5 %, se redujo la carga máxima de los BM (P<0.01. Lo mismo sucedió al incrementar la urea arriba del 6 % (P<0.05. Se concluye que es factible el empleo de vegetación marina como fuente de proteína y minerales en la elaboración de BM, logrando materiales con buena dureza.

  1. Spatial analysis on the critical habitats of bottlenose dolphins (Tursiops truncatus) and humpback whales (Megaptera novaeangliae) in Golfo Dulce, Costa Rica: Considerations for a marina construction project

    OpenAIRE

    Herra-Miranda, David; Pacheco-Polanco, Juan Diego; Oviedo, Lenin; Iñíguez, Miguel

    2015-01-01

    Golfo Dulce harbors an important resident population of inshore bottlenose dolphins (T. truncatus) and migrating humpback whales (M. novaeangliae, Northern and Southern Pacific populations). The present study offers a detailed spatial analysis of the utilization distribution of bottlenose dolphins (2005-2014: n= 407) and humpback whales (2010-2014: n= 167), assessing the potential impacts due to coastal development by a marina project overlapping their critical habitats. Records yielding spat...

  2. Effects of the polychaetes Arenicola marina and Nereis diversicolor on microbial pyrene mineralization

    DEFF Research Database (Denmark)

    Timmermann, Karen; Banta, Gary T.; Johnsen, Anders R.;

    2008-01-01

    The effects of 2 polychaetes, Nereis diversicolor and Arenicola marina, on the microbial mineralization of the organic contaminant pyrene, a polycyclic aromatic hydrocarbon (PAH), were followed over 44 d. We also examined whether the effect of the polychaetes was caused by enhanced oxygen supply,...... by the increased oxygen supply due to burrow construction and irrigation. In contrast, these worms decreased pyrene bioavailability and, hence, counteracted to some extent the stimulating effect of irrigation....

  3. Modelling the growth kinetics of Kocuria marina DAGII as a function of single and binary substrate during batch production of β-Cryptoxanthin.

    Science.gov (United States)

    Mitra, Ruchira; Chaudhuri, Surabhi; Dutta, Debjani

    2017-01-01

    In the present investigation, growth kinetics of Kocuria marina DAGII during batch production of β-Cryptoxanthin (β-CRX) was studied by considering the effect of glucose and maltose as a single and binary substrate. The importance of mixed substrate over single substrate has been emphasised in the present study. Different mathematical models namely, the Logistic model for cell growth, the Logistic mass balance equation for substrate consumption and the Luedeking-Piret model for β-CRX production were successfully implemented. Model-based analyses for the single substrate experiments suggested that the concentrations of glucose and maltose higher than 7.5 and 10.0 g/L, respectively, inhibited the growth and β-CRX production by K. marina DAGII. The Han and Levenspiel model and the Luong product inhibition model accurately described the cell growth in glucose and maltose substrate systems with a R (2) value of 0.9989 and 0.9998, respectively. The effect of glucose and maltose as binary substrate was further investigated. The binary substrate kinetics was well described using the sum-kinetics with interaction parameters model. The results of production kinetics revealed that the presence of binary substrate in the cultivation medium increased the biomass and β-CRX yield significantly. This study is a first time detailed investigation on kinetic behaviours of K. marina DAGII during β-CRX production. The parameters obtained in the study might be helpful for developing strategies for commercial production of β-CRX by K. marina DAGII.

  4. Turismo versus pesca artesanal. A propósito de la reserva marina de la isla de La Graciosa y los islotes del norte de Lanzarote

    Directory of Open Access Journals (Sweden)

    Gloria Cabrera Socorro

    2004-01-01

    Full Text Available La Reserva Marina de La Graciosa y los Islotes del Norte de Lanzarote (RMLGINL se creó en 1995 y, desde entonces, las actividades pesqueras de la población local y su cultura del mar han ido decreciendo progresivamente mientras que las actividades turísticas siguen emergiendo como la panacea en una pequeña isla, como La Graciosa, con no más de 600 habitantes. En este artículo tratamos de analizar cómo estos dos procesos están relacionados y qué papel está jugando la reserva marina en este caso. Usamos no sólo información cualitativa de los pescadores locales y de sus grupos domésticos, sino también cuantitativa contrastando algunos parámetros concretos como el número de pescadores y los barcos de pesca activos, los negocios relacionados con el sector servicios (restaurantes, apartamentos, etc., antes y después de implementación de la reserva marina. En este sentido, un importante elemento es la percepción de esta institución desde la población local, y la evolución de su actitud a favor o en contra. Estos procesos están relacionados con el diseño institucional de las reservas marinas en las Islas Canarias, en donde la participación de las poblaciones pesqueras locales está severamente limitada.

  5. Comparación ontogénica de la frecuencia de muda en Rhinella marina (Anura, Bufonidae Ontogenetic comparison of the molting frequency in Rhinella marina (Anura: Bufonidae

    Directory of Open Access Journals (Sweden)

    Teófila M. Triana

    2013-03-01

    Full Text Available La muda es un proceso de renovación de la capa externa de la epidermis (estrato corneo de los anfibios, la cual suministra protección contra daños, patógenos y pérdida de agua. Este trabajo evalúa la frecuencia de muda entre juveniles y adultos de Rhinella marina (Linnaeus, 1758 y la tasa de ocurrencia entre el día y la noche. Para esto, se realizaron dos observaciones diarias (7 am y 7 pm, entre Octubre de 2011 y Marzo de 2012, a tres grupos de individuos clasificados según su tamaño longitud rostro-cloaca, como adultos (promedio=80 mm, juveniles medianos (promedio=19 mm y juveniles pequeños (promedio=13 mm. Estos animales fueron colocados en terrarios en el laboratorio y marcados en el dorso a través de un punto hecho con un corrector de tinta. La muda se determinó por la pérdida total de la marca y una coloración brillante en el dorso. Se encontró una diferencia significativa (Kruskal-Wallis, H=19.84, pMolting is a process of constant renewal of the outer layer of epidermis (stratum corneum in amphibians, which provides a barrier against injury, pathogens and evaporative water loss. This paper evaluates the molting frequency between juveniles and adults of Rhinella marina (Linnaeus, 1758 and between the night and day time. Two daily observations, at 7 am and 7 pm, were made between October 2011 and March 2012 to three groups of individuals, classified by their size, snout vent length, as adults (mean=80 mm, medium juveniles (mean=19 mm and small juveniles (mean=13 mm. The animals were placed in terrariums in the laboratory and marked on their back with a spot of correction fluid. The molting was determined by the total loss of the mark and a bright color on the dorsal skin. We found a significant difference (Kruskal-Wallis, H=19.84, p<0.0001 in the molting frequency among the three groups: adults=7.5 days, medium juveniles=5.4 days, and small juveniles=5.3 days. Also, between the number of molting frogs during the night and day

  6. Red tides caused by Exuviaella cordata and Exuviaella marina%卵甲藻Exuviaella cordata 和Exuviaella marina赤潮的初步研究

    Institute of Scientific and Technical Information of China (English)

    周遵春; 闫喜武; 庞军辉; 马志强; 薛克; 雷善敏

    2001-01-01

    Red tides caused by Exuviaella cordata and biology of Exuviaella marina (the first occurrence in shrimp ponds of Qingdui Fisheries Coorporation of Zhuanghe) were described. The reason why red tide occurred and its harmful effects were evaluated. The conformation characteristic, ecological habits of Exuviaella cordata and Exuviaella marina was briefly described. Three species of raft-cultured shellfishes collected at red tides in Dalian Wan Bay were tested for the shellfish poison.%报道了由心形卵甲藻(Exuviaella cordata)和海洋卵甲藻(Exuviaella marina)引发的赤潮(前者于1991年发生在庄河青堆水产公司虾池中,后者于1999年7月发生在大连湾)。并对赤潮发生的原因、危害进行了分析,对引发赤潮藻类的形态和生活习性进行了描述,对大连湾赤潮区养殖的3种贝类进行了贝毒检测。

  7. Genome sequence of the Wenxinia marina type strain (DSM 24838(T)), a representative of the Roseobacter group isolated from oilfield sediments.

    Science.gov (United States)

    Riedel, Thomas; Fiebig, Anne; Han, James; Huntemann, Marcel; Spring, Stefan; Petersen, Jörn; Ivanova, Natalia N; Markowitz, Victor; Woyke, Tanja; Göker, Markus; Kyrpides, Nikos C; Klenk, Hans-Peter

    2014-06-15

    Wenxinia marina Ying et al. 2007 is the type species of the genus Wenxinia, a representative of the Roseobacter group within the alphaproteobacterial family Rhodobacteraceae, isolated from oilfield sediments of the South China Sea. This family was shown to harbor the most abundant bacteria especially from coastal and polar waters, but was also found in microbial mats, sediments and attached to different kind of surfaces. Here we describe the features of W. marina strain HY34(T) together with the genome sequence and annotation of strain DSM 24838(T) and novel aspects of its phenotype. The 4,181,754 bp containing genome sequence encodes 4,047 protein-coding genes and 59 RNA genes. The genome of W. marina DSM 24838(T) was sequenced as part of the activities of the Genomic Encyclopedia of Type Strains, Phase I: the one thousand microbial genomes (KMG) project funded by the DoE and the Transregional Collaborative Research Centre 51 (TRR51) funded by the German Research Foundation (DFG).

  8. Genome sequence of the Wenxinia marina type strain (DSM 24838T), a representative of the Roseobacter group isolated from oilfield sediments

    Science.gov (United States)

    Riedel, Thomas; Fiebig, Anne; Han, James; Huntemann, Marcel; Spring, Stefan; Petersen, Jörn; Ivanova, Natalia N.; Markowitz, Victor; Woyke, Tanja; Göker, Markus; Kyrpides, Nikos C.; Klenk, Hans-Peter

    2014-01-01

    Wenxinia marina Ying et al. 2007 is the type species of the genus Wenxinia, a representative of the Roseobacter group within the alphaproteobacterial family Rhodobacteraceae, isolated from oilfield sediments of the South China Sea. This family was shown to harbor the most abundant bacteria especially from coastal and polar waters, but was also found in microbial mats, sediments and attached to different kind of surfaces. Here we describe the features of W. marina strain HY34T together with the genome sequence and annotation of strain DSM 24838T and novel aspects of its phenotype. The 4,181,754 bp containing genome sequence encodes 4,047 protein-coding genes and 59 RNA genes. The genome of W. marina DSM 24838T was sequenced as part of the activities of the Genomic Encyclopedia of Type Strains, Phase I: the one thousand microbial genomes (KMG) project funded by the DoE and the Transregional Collaborative Research Centre 51 (TRR51) funded by the German Research Foundation (DFG). PMID:25197468

  9. Nanoparticle-based measurements of pH and O2 dynamics in the rhizosphere of Zostera marina L.: effects of temperature elevation and light-dark transitions.

    Science.gov (United States)

    Elgetti Brodersen, Kasper; Koren, Klaus; Lichtenberg, Mads; Kühl, Michael

    2016-07-01

    Seagrasses can modulate the geochemical conditions in their immediate rhizosphere through the release of chemical compounds from their below-ground tissue. This is a vital chemical defence mechanism, whereby the plants detoxify the surrounding sediment. Using novel nanoparticle-based optical O2 and pH sensors incorporated in reduced and transparent artificial sediment, we investigated the spatio-temporal dynamics of pH and O2 within the entire rhizosphere of Zostera marina L. during experimental manipulations of light and temperature. We combined such measurements with O2 microsensor measurements of the photosynthetic productivity and respiration of seagrass leaves. We found pronounced pH and O2 microheterogeneity within the immediate rhizosphere of Z. marina, with higher below-ground tissue oxidation capability and rhizoplane pH levels during both light exposure of the leaf canopy and elevated temperature, where the temperature-mediated stimuli of biogeochemical processes seemed to predominate. Low rhizosphere pH microenvironments appeared to correlate with plant-derived oxic microzones stimulating local sulphide oxidation and thus driving local proton generation, although the rhizoplane pH levels generally where much higher than the bulk sediment pH. Our data show that Z. marina can actively alter its rhizosphere pH microenvironment alleviating the local H2 S toxicity and enhancing nutrient availability in the adjacent sediment via geochemical speciation shift. © 2016 John Wiley & Sons Ltd.

  10. COVE, MARINA, and the Future of On-Board Processing (OBP) Platforms for CubeSat Science Missions

    Science.gov (United States)

    Pingree, P.; Bekker, D. L.; Bryk, M.; DeLucca, J.; Franklin, B.; Hancock, B.; Klesh, A. T.; Meehan, C.; Meshkaty, N.; Nichols, J.; Peay, C.; Rider, D. M.; Werne, T.; Wu, Y.

    2012-12-01

    The CubeSat On-board processing Validation Experiment (COVE), JPL's first CubeSat payload launched on October 28, 2011, features the Xilinx Virtex-5QV Single event Immune Reconfigurable FPGA (SIRF). The technology demonstration mission was to validate the SIRF device running an on-board processing (OBP) algorithm developed to reduce the data set by 2-orders of magnitude for the Multi-angle SpectroPolarimetric Imager (MSPI), an instrument under development at JPL (PI: D. Diner). COVE has a single data interface to the CubeSat flight computer that is used to transfer a static image taken from the CubeSat camera and store it to local memory where the FPGA then reads it to run the algorithm on it. In the next generation COVE design, called MARINA, developed for the GRIFEX CubeSat project, the OBP board is extended, using rigid-flex PCB technology, to provide an interface to a JPL-developed Read-Out Integrated Circuit (ROIC) hybridized to a detector developed by Raytheon. In this configuration the focal plane array (FPA) data can be streamed directly to the FPGA for data processing or for storage to local memory. The MARINA rigid-flex PCB design is integrated with a commercial camera lens to create a 1U instrument payload for integration with a CubeSat under development by the University of Michigan and planned for launch in 2014. In the GRIFEX technology demonstration, the limited on-board storage capacity is filled by high-rate FPA data in less than a second. The system is also limited by the CubeSat downlink data rate and several ground station passes are required to transmit this limited amount of data. While this system is sufficient to validate the ROIC technology on-orbit, the system cannot be operated in a way to perform continuous science observations due to the on-board storage and data downlink constraints. In order to advance the current platform to support sustained science observations, more on-board storage is needed. Radiation tolerant memory

  11. La corrosión en atmósferas marinas. Efecto de la distancia a la costa

    Directory of Open Access Journals (Sweden)

    Chico, B.

    1998-05-01

    Full Text Available In marine atmospheres the deposition of saline particles on the surface of metals intensifies the metallic corrosion process. However, quantitative information about the effect of atmospheric salinity on metallic corrosion is very scarce. This paper reports the relationship between salinity and metallic corrosion, where a clear linear relation (r = 0.97 has been found for a broad interval of salinities (4-500 mg Cl-/m2d, as well as the relationship between salinity (or metallic corrosion and distance from the coast. A hyperbolic function seems to be established between both variables; there is an exponential drop in salinity (or corrosion as shoreline distance increases tending towards an asymptotic value. The study has been based on information obtained from field research conducted at a marine atmosphere in Tarragona (Spain and data compiled from the literature.

    En las atmósferas marinas, el depósito de partículas salinas sobre la superficie de los metales, acelera el proceso de corrosión metálica. Sin embargo, es muy escasa la información cuantitativa acerca del efecto de la salinidad atmosférica sobre la corrosión metálica. Este trabajo presenta la relación existente entre salinidad y corrosión metálica, encontrándose una clara relación lineal (r = 0,97 para un amplio intervalo de salinidades (4-500 mg Cl-/m2d, así como la relación existente entre salinidad (o corrosión metálica y distancia a la costa. Aquí, parece establecerse una función hiperbólica entre ambas variables, existiendo un decrecimiento exponencial de la salinidad (o corrosión a medida que aumenta la distancia a la costa, tendiendo hacia un valor asintótico. Este estudio analiza la información obtenida en una zona de experimentación ubicada en una atmósfera marina en Tarragona (España junto con datos recopilados de la literatura.

  12. Actividad antibacteriana de extractos etanólicos de macroalgas marinas de la costa central del Perú

    Directory of Open Access Journals (Sweden)

    Claudio Magallanes

    2013-06-01

    Full Text Available Se evaluó la actividad antibacteriana de extractos etanólicos de 12 especies de macroalgas marinas. Los extractos fueron obtenidos de acuerdo al protocolo modificado de Vlachos et al. (1996. Cada extracto se enfrentó contra 5 cepas bacterianas de origen clínico y 6 no clínico perteneciente a los géneros Staphylococcus, Enterococcus, Pseudomonas, Escherichia, Salmonella, Aeromonas y Vibrio. De 12 especies de algas ensayadas solamente 5 (Grateloupia doryphora, Ahnfeltiopsis durvillaei, Prionitis decipiens, Petalonia fascia y Bryopsis plumosa presentaron algún efecto antibacteriano. Asimismo, de 11 cepas bacterianas probadas solamente las cepas clínicas Staphylococcus aureus ATCC 25923 y Enterococcus faecalis ATCC 29212 y la cepa no clínica Staphylococcus aureus ATCC 6633 fueron sensibles a los extractos algales. El extracto etanólico de B. plumosa presentó el mayor efecto antibacteriano contra las dos cepas de S. aureus, manifestándose en el mayor tamaño de sus halos de inhibición, mientras que el extracto de P. fascia mostró mayor espectro antibacteriano, inhibiendo a las 3 cepas mencionadas.

  13. Experimental weed control of Najas marina ssp. intermedia and Elodea nuttallii in lakes using biodegradable jute matting

    Directory of Open Access Journals (Sweden)

    Markus A. Hoffmann

    2013-10-01

    Full Text Available The use of jute matting in managing the invasive aquatic macrophyte species Elodea nuttallii (Planch. H. St. John and Najas marina ssp. intermedia (Wolfg. ex Gorski Casper (Najas intermedia was studied in laboratory experiments and field trials. Four German lakes with predominant population of Najas intermedia or Elodea nuttalli were chosen for the experiment and areas between 150 and 300 m² were covered with jute textile. The effect of the matting on the growth of invasive and non-invasive macrophytes was determined through comparison with control transects. Biodegradable jute matting successfully suppressed the invasive macrophyte Najas intermedia and significantly reduced the growth of Elodea nuttalli in lakes. The results indicate that the capability of the matting to inhibit the growth of Elodea nuttallii and Najas intermedia depends on the mesh size of the jute weaving and that environmental conditions can affect its efficiency. Various indigenous species like Charales or Potamogeton pusillus L. were able to grow through the jute fabric and populate the treated areas. Until the end of the vegetation period, none of the invasive species were able to penetrate the covering and establish a stable population; in fact, in the subsequent year the jute matting affected only the spread of Najas intermedia. Jute matting proved to be an easy-to-use and cheap method to control the growth of Elodea nuttallii and Najas intermedia.

  14. Niveles de plomo y cadmio en agua marina y lapas (Patella vulgata L. de la Ría de Vigo

    Directory of Open Access Journals (Sweden)

    M. Pérez López

    2003-01-01

    Full Text Available El empleo de seres vivos para monitorizar la contaminación por metales pesados en los ecosistemas acuáticos es de extremo interés en el campo de la ecotoxicología. En el presente estudio se han recogido muestras de agua marina y de lapas (Patella vulgata L. de distintos puntos de la Ría de Vigo, con la intención de determinar en ellos los niveles de plomo y cadmio, por medio de una técnica de voltamperometría. Los resultados obtenidos mostraron una relación estrecha entre los niveles hallados en las muestras de agua, y los encontrados en los moluscos, sobre todo los correspondientes a los tejidos blandos de lapas, relacionándose directamente a un incremento en la contaminación medioambiental. La concentración fue más elevada en los tejidos blandos que en la valva, especialmente en el caso del Cd (incremento aproximado de 93.6 veces. Los niveles de contaminación metálica fueron mayores en los animales recogidos en la zona interior de la Ría, salvo en el caso del cadmio presente en los tejidos blandos, donde la concentración máxima (5.62 ppm correspondió con muestras próximas al mar abierto

  15. Helkesimastix marina n. sp. (Cercozoa: Sainouroidea superfam. n.) a gliding zooflagellate of novel ultrastructure and unusual ciliary behaviour.

    Science.gov (United States)

    Cavalier-Smith, Thomas; Lewis, Rhodri; Chao, Ema E; Oates, Brian; Bass, David

    2009-08-01

    Unlike Helkesimastix faecicola and H. major, Helkesimastix marina is marine, ingests bacteria, is probably also a cannibal, and differs in cell cycle ciliary behaviour. Daughter kinetids have mirror symmetry; pre-division cilia beat asymmetrically. We sequenced its 18S rDNA and studied its ultrastructure to clarify its taxonomy. Helkesimastix (Helkesimastigidae fam. n.) differs unexpectedly radically from cercomonads, lacking their complex microtubular ciliary roots, grouping not with them but with Sainouridae within Pansomonadida. Longitudinal cortical microtubules emanate from a dense apical centrosomal plate, where a striated rhizoplast attaches the nucleus, and two very short subparallel centrioles attach by dense fibres. The marginally more posterior centriole, attached to the centrosomal plate by a dense forked fibre, bears the long 9+2 gliding posterior cilium and a microtubular root; the left-side, nucleus-attached, left centriole bears an immotile ciliary stump with abnormal axoneme of nine disorganized mainly singlet microtubules, unlike the sainourid anterior papilla. Both transitional regions have a proximal lattice, the posterior centriole with slender hub. Sainouroidea superfam. n. (Sainouridae; Helkesimastigidae) have homologous cytoskeletal geometry. Dorsal Golgi dictyosome and posterior microbody are attached to the nuclear envelope, which has slender micro-invaginations and probably a cortical lattice. Bacteria are digested posteriorly in association with numerous mitochondria with flat cristae.

  16. Lanfrediella amphicirrus gen. nov. sp. nov. Nematotaeniidae (Cestoda: Cyclophyllidea, a tapeworm parasite of Rhinella marina (Linnaeus, 1758 (Amphibia: Bufonidae

    Directory of Open Access Journals (Sweden)

    Francisco Tiago de Vasconcelos Melo

    2011-09-01

    Full Text Available The family Nematotaeniidae, tapeworms commonly found in the small intestines of amphibians and reptiles, includes 27 recognised species distributed among four genera: Bitegmen Jones, Cylindrotaenia Jewell, Distoichometra Dickey and Nematotaenia Lühe. The taxonomy of these cestodes is poorly defined, due in part to the difficulties of observing many anatomical traits. This study presents and describes a new genus and species of nematotaeniid parasite found in cane toads (Rhinella marina from eastern Brazilian Amazonia. The cestodes were collected during the necropsy of 20 hosts captured in the urban area of Belém, Pará. The specimens were fixed and processed for light microscopy, scanning electron microscopy (SEM and three-dimensional (3D reconstruction. Samples were also collected for molecular analyses. The specimens presented a cylindrical body, two testes and paruterine organs. However, they could not be allocated to any of the four existing nematotaeniid genera due to the presence of two each of dorsal compact medullary testes, cirri, cirrus pouches, genital pores, ovaries and vitelline glands per mature segment. Lanfrediella amphicirrus gen. nov. sp. nov. is the first nematotaeniid studied using Historesin analysis, SEM and 3D reconstruction, and it is the second taxon for which molecular data have been deposited in GenBank.

  17. Establishing a baseline for regional scale monitoring of eelgrass (Zostera marina) habitat on the lower Alaska Peninsula

    Science.gov (United States)

    Hogrefe, Kyle R.; Ward, David H.; Donnelly, Tyrone F.; Dau, Niels

    2014-01-01

    Seagrass meadows, one of the world’s most widespread and productive ecosystems, provide a wide range of services with real economic value. Worldwide declines in the distribution and abundance of seagrasses and increased threats to coastal ecosystems from climate change have prompted a need to acquire baseline data for monitoring and protecting these important habitats. We assessed the distribution and abundance of eelgrass (Zostera marina) along nearly 1200 km of shoreline on the lower Alaska Peninsula, a region of expansive eelgrass meadows whose status and trends are poorly understood. We demonstrate the effectiveness of a multi-scale approach by using Landsat satellite imagery to map the total areal extent of eelgrass while integrating field survey data to improve map accuracy and describe the physical and biological condition of the meadows. Innovative use of proven methods and processing tools was used to address challenges inherent to remote sensing in high latitude, coastal environments. Eelgrass was estimated to cover ~31,000 ha, 91% of submerged aquatic vegetation on the lower Alaska Peninsula, nearly doubling the known spatial extent of eelgrass in the region. Mapping accuracy was 80%–90% for eelgrass distribution at locations containing adequate field survey data for error analysis.

  18. Spergularia marina induces glucagon-like peptide-1 secretion in NCI-H716 cells through bile acid receptor activation.

    Science.gov (United States)

    Kim, Kyong; Lee, Yu Mi; Rhyu, Mee-Ra; Kim, Hye Young

    2014-11-01

    Spergularia marina Griseb. (SM) is a halophyte that grows in mud flats. The aerial portions of SM have been eaten as vegetables and traditionally used to prevent chronic diseases in Korea. However, there has been no scientific report that demonstrates the pharmacological effects of SM. Glucagon-like peptide-1 (GLP-1) is important for the maintenance of glucose and energy homeostasis through acting as a signal in peripheral and neural systems. To discover a functional food for regulating glucose and energy homeostasis, we evaluated the effect of an aqueous ethanolic extract (AEE) of SM on GLP-1 release from enteroendocrine NCI-H716 cells. In addition, we explored the Takeda G-protein-coupled receptor 5 (TGR5) agonist activity of AEE-SM in Chinese hamster ovary (CHO)-K1 cells transiently transfected with human TGR5. As a result, treatment of NCI-H716 cells with AEE-SM increased GLP-1 secretion and intracellular Ca(2+) and cyclic AMP (cAMP) levels in a dose-dependent manner. Transfection of NCI-H716 cells with TGR5-specific small interference RNA inhibited AEE-SM-induced GLP-1 secretion and the increase in Ca(2+) and cAMP levels. Moreover, AEE-SM showed that the TGR5 agonist activity in CHO-K1 cells transiently transfected with TGR5. The results suggest that AEE-SM might be a candidate for a functional food to regulate glucose and energy homeostasis.

  19. Ocean acidification increases copper toxicity to the early life history stages of the polychaete Arenicola marina in artificial seawater.

    Science.gov (United States)

    Campbell, Anna L; Mangan, Stephanie; Ellis, Robert P; Lewis, Ceri

    2014-08-19

    The speciation and therefore bioavailability of the common pollutant copper is predicted to increase within the pH range anticipated under near-future ocean acidification (OA), hence the potential exists for copper toxicity to marine organisms to also increase. We investigated the impact of OA (seawater pH values of 7.77 (pCO2 1400 μatm) and 7.47 (pCO2 3000 μatm)) upon copper toxicity responses in early life history stages of the polychaete Arenicola marina and found both synergistic and additive toxicity effects of combined exposures depending on life history stage. The toxicity of copper on sperm DNA damage and early larval survivorship was synergistically increased under OA conditions. Larval survival was reduced by 24% when exposed to both OA and copper combined compared to single OA or copper exposures. Sperm motility was negatively affected by both OA and copper singularly with additive toxicity effects of the two stressors when combined. Fertilization success was also negatively affected by both OA and copper individually, but no additive effects when exposed as combined stressors were present for this stage. These findings add to the growing body of evidence that OA will act to increase the toxicity of copper to marine organisms, which has clear implications for coastal benthic ecosystems suffering chronic metal pollution as pCO2 levels rise and drive a reduction in seawater pH.

  20. Establishing a Baseline for Regional Scale Monitoring of Eelgrass (Zostera marina Habitat on the Lower Alaska Peninsula

    Directory of Open Access Journals (Sweden)

    Kyle R. Hogrefe

    2014-12-01

    Full Text Available Seagrass meadows, one of the world’s most widespread and productive ecosystems, provide a wide range of services with real economic value. Worldwide declines in the distribution and abundance of seagrasses and increased threats to coastal ecosystems from climate change have prompted a need to acquire baseline data for monitoring and protecting these important habitats. We assessed the distribution and abundance of eelgrass (Zostera marina along nearly 1200 km of shoreline on the lower Alaska Peninsula, a region of expansive eelgrass meadows whose status and trends are poorly understood. We demonstrate the effectiveness of a multi-scale approach by using Landsat satellite imagery to map the total areal extent of eelgrass while integrating field survey data to improve map accuracy and describe the physical and biological condition of the meadows. Innovative use of proven methods and processing tools was used to address challenges inherent to remote sensing in high latitude, coastal environments. Eelgrass was estimated to cover ~31,000 ha, 91% of submerged aquatic vegetation on the lower Alaska Peninsula, nearly doubling the known spatial extent of eelgrass in the region. Mapping accuracy was 80%–90% for eelgrass distribution at locations containing adequate field survey data for error analysis.

  1. La política marítima de la Unión Europea y su contribución a la prevención de la contaminación marina

    OpenAIRE

    Bou Franch, Valentín

    2009-01-01

    El presente trabajo analiza cómo la recién creada Política marítima de la Unión Europea puede contribuir a la prevención de la contaminación marina. Examino el contenido de la Estrategia temática sobre la protección y la conservación del medio ambiente marino, así como la manera en la que se ha concretado en la Directiva marco sobre la estrategia marina. Esta Directiva marco implica la creación de estrategias marinas nacionales con la finalidad de proteger el medio marino de la contaminación...

  2. Acute toxicity of Chattonella Marina on Artemia Sinica%海洋卡盾藻对卤虫的急性毒性效应

    Institute of Scientific and Technical Information of China (English)

    徐艳红; 江涛; 沈萍萍; 王锐; 吴霓; 江天久

    2012-01-01

    研究了海洋卡盾藻在不同生长阶段和不同密度下对卤虫的急性毒性效应.结果表明,海洋卡盾藻的含藻培养液和除藻过滤液均对卤虫有致死作用,且前者毒性大于后者.对数生长初期的海洋卡盾藻含藻培养液的毒性作用最强,卤虫暴露在3.0×104 cells/mL藻液48h后,死亡率达到83%;对数生长后期海洋卡盾藻含藻培养液也具有较强的毒性,48 h卤虫死亡率为73%;衰亡期含藻培养液毒性最弱,48 h卤虫死亡率为33%.海洋卡盾藻含藻培养液和除藻过滤液(对数生长期,10 d)的浓度对数与卤虫的死亡机率单位呈线性关系,含藻培养液对卤虫24h半致死浓度(LD50)为1.92×104cells/mL,而除藻过滤液对卤虫的24 h LD50为3.34×104cells/mL.卤虫在海洋卡盾藻含藻培养液中的暴露时间(48 h内)与死亡率呈线性相关关系,在藻密度为3.75×104cells/mL时,海洋卡盾藻含藻培养液对卤虫的半致死时间(LT50)为17.3 h.%The acute toxicity of Chattonella marina at different growth phases and concentrations on Artemia Sinica was investigated in the present study. The results showed that the maximum toxicity of C. marina on A. salina appeared at the early stage of logarithmic phase, and the death rate of A. sinica reached 83% after 48 h when it was exposed to the algae cell suspension at density of 3. 0 x 104 cells/ mL. The lowest toxicity of C. marina on A. sinica appeared in the decline phase with death rate of 33% . Interestingly, the filtered cell-free cultures of Chattonella marina were also toxic to A. sinica, but less toxic than the cell-suspended cultures. The probit mortality of A. salina was closely correlated to the log dose of cell-suspended and cell-free culture of C. marina (10 d). The 24 - h LD50 of the cell suspension and cell-free culture of C. marina was 1. 92 x 10 and 3. 34 x 10 cells/mL, respectively. The probit mortality of A. salina was also correlated with time and the LT50 of A. salina

  3. An economical non-destructive method for estimating eelgrass, Zostera marina (Potamogetonaceae leaf growth rates: formal development and use in northwestern Baja California

    Directory of Open Access Journals (Sweden)

    Elena Solana-Arellano

    2008-09-01

    Full Text Available Seagrass beds provide much of the primary production in estuaries; host many fishes and fish larvae, and abate erosion. The present study presents original analytical methods for estimating mean leaf-growth rates of eelgrass (Zostera marina. The method was calibrated by using data collected in a Z. marina meadow at Punta Banda estuary in Baja California, Mexico. The analytical assessments were based on measurements of leaf length and standard regression procedures. We present a detailed explanation of the formal procedures involved in the derivation of these analytical methods. The measured daily leaf-growth rate was 10.9 mm d-1 leaf-1. The corresponding value projected by our method was 10.2 mm d-1 leaf-1. The associated standard errors were of 0.53 and 0.56 mm d-1 leaf-1 respectively. The method was validated by projecting leaf-growth rates from an independent data set, which gave consistent results. The use of the method to obtain the mean leaf growth rate of a transplanted plot is also illustrated. Comparison of our leaf-growth data with previously reported assessments show the significant forcing of sea-surface temperature on eelgrass leaf dynamics. The formal constructs provided here are of general scope and can be applied to equivalent eelgrass data sets in a straightforward manner. Rev. Biol. Trop. 56 (3: 1003-1013. Epub 2008 September 30.Las praderas de pastos marinos abaten la erosión y aportan gran parte de la productividad primaria de los esteros y son refugio de muchos peces y sus larvas. El presente trabajo introduce métodos analíticos para estimar las tasas medias de crecimiento foliar de Zostera marina L. y sus varianzas. La calibración del método se llevó a cabo utilizando datos de una pradera de esta fanerógama en el Estero de Punta Banda Baja California, México. Las referidas estimaciones analíticas, se basan en medias de longitud foliar y en procedimientos estandarizados de regresión. Dichas determinaciones son por

  4. Identification of light-harvesting chlorophyll a/b-binding protein genes of Zostera marina L. and their expression under different environmental conditions

    Science.gov (United States)

    Kong, Fanna; Zhou, Yang; Sun, Peipei; Cao, Min; Li, Hong; Mao, Yunxiang

    2016-02-01

    Photosynthesis includes the collection of light and the transfer of solar energy using light-harvesting chlorophyll a/b-binding (LHC) proteins. In high plants, the LHC gene family includes LHCA and LHCB sub-families, which encode proteins constituting the light-harvesting complex of photosystems I and II. Zostera marina L. is a monocotyledonous angiosperm and inhabits submerged marine environments rather than land environments. We characterized the Lhca and Lhcb gene families of Z. marina from the expressed sequence tags (EST) database. In total, 13 unigenes were annotated as ZmLhc, 6 in Lhca family and 7 in ZmLhcb family. ZmLHCA and ZmLHCB contained the conservative LHC motifs and amino acid residues binding chlorophyll. The average similarity among mature ZmLHCA and ZmLHCB was 48.91% and 48.66%, respectively, which indicated a high degree of divergence within ZmLHChc gene family. The reconstructed phylogenetic tree showed that the tree topology and phylogenetic relationship were similar to those reported in other high plants, suggesting that the Lhc genes were highly conservative and the classification of ZmLhc genes was consistent with the evolutionary position of Z. marina. Real-time reverse transcription (RT) PCR analysis showed that different members of ZmLhca and ZmLhcb responded to a stress in different expression patterns. Salinity, temperature, light intensity and light quality may affect the expression of most ZmLhca and ZmLhcb genes. Inorganic carbon concentration and acidity had no obvious effect on ZmLhca and ZmLhcb gene expression, except for ZmLhca6.

  5. The role of O2 as an electron acceptor alternative to CO2 in photosynthesis of the common marine angiosperm Zostera marina L.

    Science.gov (United States)

    Buapet, Pimchanok; Björk, Mats

    2016-07-01

    This study investigates the role of O2 as an electron acceptor alternative to CO2 in photosynthesis of the common marine angiosperm Zostera marina L. Electron transport rates (ETRs) and non-photochemical quenching (NPQ) of Z. marina were measured under saturating irradiance in synthetic seawater containing 2.2 mM DIC and no DIC with different O2 levels (air-equilibrated levels, 3 % of air equilibrium and restored air-equilibrated levels). Lowering O2 did not affect ETR when DIC was provided, while it caused a decrease in ETR and an increase in NPQ in DIC-free media, indicating that O2 acted as an alternative electron acceptor under low DIC. The ETR and NPQ as a function of irradiance were subsequently assessed in synthetic seawater containing (1) 2.2 mM DIC, air-equilibrated O2; (2) saturating CO2, no O2; and (3) no DIC, air-equilibrated O2. These treatments were combined with glycolaldehyde pre-incubation. Glycolaldehyde caused a marked decrease in ETR in DIC-free medium, indicating significant electron flow supported by photorespiration. Combining glycolaldehyde with O2 depletion completely suppressed ETR suggesting the operation of the Mehler reaction, a possibility supported by the photosynthesis-dependent superoxide production. However, no notable effect of suppressing the Mehler reaction on NPQ was observed. It is concluded that during DIC-limiting conditions, such as those frequently occurring in the habitats of Z. marina, captured light energy exceeds what is utilised for the assimilation of available carbon, and photorespiration is a major alternative electron acceptor, while the contribution of the Mehler reaction is minor.

  6. Soil and Rhizosphere Associated Fungi in Gray Mangroves (Avicennia marina from the Red Sea — A Metagenomic Approach

    Directory of Open Access Journals (Sweden)

    Marta Filipa Simões

    2015-10-01

    Full Text Available Covering a quarter of the world’s tropical coastlines and being one of the most threatened ecosystems, mangroves are among the major sources of terrestrial organic matter to oceans and harbor a wide microbial diversity. In order to protect, restore, and better understand these ecosystems, researchers have extensively studied their microbiology, yet few surveys have focused on their fungal communities. Our lack of knowledge is even more pronounced for specific fungal populations, such as the ones associated with the rhizosphere. Likewise, the Red Sea gray mangroves (Avicennia marina remain poorly characterized, and understanding of their fungal communities still relies on cultivation-dependent methods. In this study, we analyzed metagenomic datasets from gray mangrove rhizosphere and bulk soil samples collected in the Red Sea coast, to obtain a snapshot of their fungal communities. Our data indicated that Ascomycota was the dominant phylum (76%–85%, while Basidiomycota was less abundant (14%–24%, yet present in higher numbers than usually reported for such environments. Fungal communities were more stable within the rhizosphere than within the bulk soil, both at class and genus level. This finding is consistent with the intrinsic patchiness in soil sediments and with the selection of specific microbial communities by plant roots. Our study indicates the presence of several species on this mycobiome that were not previously reported as mangrove-associated. In particular, we detected representatives of several commercially-used fungi, e.g., producers of secreted cellulases and anaerobic producers of cellulosomes. These results represent additional insights into the fungal community of the gray mangroves of the Red Sea, and show that they are significantly richer than previously reported.

  7. COMPORTAMIENTO ESTACIONAL DE LA CAPA DE MEZCLA MARINA EN LA REGIÓN NORTE DEL GOLFO DE CALIFORNIA

    Directory of Open Access Journals (Sweden)

    Emilio Palacios Hernández

    2016-01-01

    Full Text Available Se realiza l a descripción de la profundidad de la capa de mezcla marina superficial (PCM en la Región Norte del Golfo de California (RNGC, utilizando datos hidrográficos obtenidos en 17 cruceros oceanográficos desde 1971 hasta 1996. La profundidad de la capa se estima directament e de los perfiles de densidad . El promedio de distribución espacial muestra un máximo bien definido en la salida del canal de Ballenas y un mínimo en las costas de Sonora y de Baja California donde la capa de mezcla no puede ser más profunda ya que son lugares demasiado someros y la mez cla cubre toda la profundidad del lugar. La PCM en la RNGC tiene una señal estacional con una transición en abril y otra en octubre. En verano (ju l io a septiembre la profundidad de la capa de mezcla se caracteriza por ser demasiado so mera mostrando un máx imo de 48 m y un mínimo de 10 m, mientras que en invierno (enero a marz o se prof undiza a un máximo de hasta 100 m . Existe una anomalía en el evento de ma rzo de 1973 la cual muestra estima ciones de PCM mayores que las esperadas, estas anomalías al parecer son causadas por el evento interanual El Niño (EN 1972 - 1973, ya que no se pudo encontrar evidencia similar del fenómeno en otros marzos.

  8. Hydrochemical features of groundwater in a coastal gypsum karst (Marina di Lesina, Gargano, Southern Italy) in relation to tides

    Science.gov (United States)

    Fidelibus, Maria Dolores; Campana, Claudia

    2014-05-01

    As part of a complex monitoring aimed at collecting suitable data for conceptual and numerical modelling of the coastal gypsum karst of Marina di Lesina (Gargano, Southern Italy), 64 groundwater samples were collected during three surveys at different depths from 9 monitoring wells aligned along two transects. The transects, perpendicular to the Acquarotta canal, are less of 1 Km long. The canal is directly connected to the sea and to the Lesina Lagoon and behaves as an oscillating border following sea tides. The sampling campaigns were carried out concurrently to phases of increasing, decreasing, and low tide and provide different frameworks of the chemical composition of ground waters. TDS (Total Dissolved Solids) of ground water samples ranges from 0.2 g/l to 35 g/l and increases generally along the flow lines towards the canal, and downward. The concentrations of the major ions deviate from theoretical ones defined by non-reactive mixing lines, which have as saline end-member either standard seawater or local seawater sampled offshore.Owing to the multi-component character of the hydrochemical system, the cation concentrations are controlled by competition among concurrent water-rock interaction processes that overlap to non-reactive freshwater-saltwater (FW-SW) mixing, being even triggered and/or enhanced by the same mixing, with feedback loops: gypsum and calcite dissolution, ion exchange (with direction depending on hydrodynamic conditions mainly driven by tides, and justified due to the presence of clay in the gypsum bedrock), and dedolomitization. The geochemical study also highlights the involvement of saline ground waters belonging to regional circuits that develop in the huge Mesozoic carbonate basement. The study highlights that in the saturated thickness of the gypsum coastal aquifer closer to the coast, the hydrochemical system is extremely reactive and strongly influenced by the different groundwater hydraulic conditions induced by the tide phases.

  9. Soil and Rhizosphere Associated Fungi in Grey Mangroves (Avicennia marina) from the Red Sea - A Metagenomic Approach

    KAUST Repository

    Simões, Marta Filipa

    2015-11-05

    Covering a quarter of the world’s tropical coastlines and being one of the most threatened ecosystems, mangroves are among the major sources of terrestrial organic matter to oceans and harbor a wide microbial diversity. In order to protect, restore, and better understand these ecosystems, researchers have extensively studied their microbiology, yet few surveys have focused on their fungal communities. Our lack of knowledge is even more pronounced for specific fungal populations, such as the ones associated with the rhizosphere. Likewise, the Red Sea grey mangroves (Avicennia marina) remain poorly characterized, and understanding of their fungal communities still relies on cultivation-dependent methods. In this study, we analyzed metagenomic datasets from grey mangrove rhizosphere and bulk soil samples collected in the Red Sea coast, to obtain a snapshot of their fungal communities. Our data indicated that Ascomycota was the dominant phylum (76%–85%), while Basidiomycota was less abundant (14%–24%), yet present in higher numbers than usually reported for such environments. Fungal communities were more stable within the rhizosphere than within the bulk soil, both at class and genus level. This finding is consistent with the intrinsic patchiness in soil sediments and with the selection of specific microbial communities by plant roots. Our study indicates the presence of several species on this mycobiome that were not previously reported as mangrove-associated. In particular, we detected representatives of several commercially-used fungi, e.g., producers of secreted cellulases and anaerobic producers of cellulosomes. These results represent additional insights into the fungal community of the grey mangroves of the Red Sea, and show that they are significantly richer than previously reported.

  10. Evidence of eelgrass (Zostera marina) seed dispersal by northern diamondback terrapin (Malaclemys terrapin terrapin) in lower Chesapeake Bay.

    Science.gov (United States)

    Tulipani, Diane C; Lipcius, Romuald N

    2014-01-01

    The initial discovery in May 2009 of eelgrass (Zostera marina) seeds in fecal samples of wild-caught northern diamondback terrapins (Malaclemys terrapin terrapin) was the first field evidence of eelgrass seed ingestion in this species. This finding suggested the potential of terrapins as seed dispersers in eelgrass beds, which we sampled for two additional years (2010 and 2011). Seeds were only found in feces of terrapins captured prior to June 8 in all three years, coinciding with eelgrass seed maturation and release. Numbers of seeds in terrapin feces varied annually and decreased greatly in 2011 after an eelgrass die off in late 2010. The condition of seeds in terrapin feces was viable-mature, germinated, damaged, or immature. Of terrapins captured during time of seed release, 97% were males and juvenile females, both of which had head widths seeds was 33% for males, 35% for small females, and only 6% for large (mature) females. Probability of seed ingestion decreased exponentially with increasing terrapin head width; only males and small females (head width seed dispersal. The characteristic that diamondback terrapins have well-defined home ranges allowed us to estimate the number of terrapins potentially dispersing eelgrass seeds annually. In seagrass beds of the Goodwin Islands region (lower York River, Virginia), there were 559 to 799 terrapins, which could disperse between 1,341 and 1,677 eelgrass seeds annually. These would represent a small proportion of total seed production within a single seagrass bed. However, based on probable home range distances, terrapins can easily traverse eelgrass meadow boundaries, thereby dispersing seeds beyond the bed of origin. Given the relatively short dispersion distance of eelgrass seeds, the diamondback terrapin may be a major source of inter-bed seed dispersal and genetic diversity.

  11. Sexual selection in cane toads Rhinella marina: A male’s body size affects his success and his tactics

    Directory of Open Access Journals (Sweden)

    Haley BOWCOCK, Gregory P. BROWN, Richard SHINE

    2013-12-01

    Full Text Available Male body size can play an important role in the mating systems of anuran amphibians. We conducted laboratory-based trials with cane toads Rhinella (Bufo marina from an invasive population in the wet-dry tropics of northern Australia, to clarify the effects of a male's body size on his reproductive success and behavior (mate choice. Males were stimulated with a synthetic hormone to induce reproductive readiness. Larger body size enhanced a male toad's ability to displace a smaller rival from amplexus, apparently because of physical strength: more force was required to dislodge a larger than a smaller amplectant male. A male’s body size also affected his mate-choice criteria. Males of all body sizes were as likely to attempt amplexus with another male as with a female of the same size, and preferred larger rather than smaller sexual targets. However, this size preference was stronger in larger males and hence, amplexus was size-assortative. This pattern broke down when males were given access to already-amplectant male-female pairs: males of all body sizes readily attempted amplexus with the pair, with no size discrimination. An amplectant pair provides a larger visual stimulus, and prolonged amplexus provides a strong cue for sex identification (one of the individuals involved is almost certainly a female. Thus, a male cane toad’s body size affects both his ability to defeat rivals in physical struggles over females, and the criteria he uses when selecting potential mates, but the impacts of that selectivity depend upon the context in which mating occurs [Current Zoology 59 (6: 747–753, 2013].

  12. Desiccation risk drives the spatial ecology of an invasive anuran (Rhinella marina in the Australian semi-desert.

    Directory of Open Access Journals (Sweden)

    Reid Tingley

    Full Text Available Some invasive species flourish in places that impose challenges very different from those faced in their native geographic ranges. Cane toads (Rhinella marina are native to tropical and subtropical habitats of South and Central America, but have colonised extremely arid regions over the course of their Australian invasion. We radio-tracked 44 adult cane toads at a semi-arid invasion front to investigate how this invasive anuran has managed to expand its geographic range into arid areas that lie outside of its native climatic niche. As predicted from their low physiological control over rates of evaporative water loss, toads selected diurnal shelter sites that were consistently cooler and damper (and thus, conferred lower water loss rates than nearby random sites. Desiccation risk also had a profound influence on rates of daily movement. Under wet conditions, toads that were far from water moved further between shelter sites than did conspecifics that remained close to water, presumably in an attempt to reach permanent water sources. However, this relationship was reversed under dry conditions, such that only toads that were close to permanent water bodies made substantial daily movements. Toads that were far from water bodies also travelled along straighter paths than did conspecifics that generally remained close to water. Thus, behavioural flexibility--in particular, an ability to exploit spatial and temporal heterogeneity in the availability of moist conditions--has allowed this invasive anuran to successfully colonize arid habitats in Australia. This finding illustrates that risk assessment protocols need to recognise that under some circumstances an introduced species may be able to thrive in conditions far removed from any that it experiences in its native range.

  13. Seasonal dynamics of the lungworm, Rhabdias pseudosphaerocephala, in recently colonised cane toad (Rhinella marina) populations in tropical Australia.

    Science.gov (United States)

    Pizzatto, Lígia; Kelehear, Crystal; Shine, Richard

    2013-08-01

    The impact of parasites on host populations depend upon parasite prevalence and intensity. Understanding how infection dynamics change through time following a host population's initial exposure to the parasite is fundamental to host-parasite biology. We studied an invasive host (the cane toad, Rhinella marina) currently undergoing range expansion - a process through which this host's range is expanding faster than that of its lung parasites (the nematode, Rhabdias pseudosphaerocephala), such that hosts at the expanding range edge remain parasite-free for several years. It was predicted that parasite intensity and prevalence would be affected by host characteristics (e.g., size, sex), environmental conditions (e.g., seasons, habitat type), and time since parasite arrival in the newly established invading host population. Over 2,400 cane toads were sampled at 10 sites in recently established toad populations in the highly seasonal monsoonal tropics of northern Australia. The sampling spanned 14 consecutive 3 month seasons commencing in the early stages of lungworm establishment in those toad populations. Both parasite prevalence and intensity increased with host body size but were unaffected by host sex. Prevalence and intensity were highest during drier times of year and in drier habitats (i.e., sites lacking permanent waterbodies). These changes in parasite prevalence may reflect a trend for saturated soil to reduce parasite survival during the free-living infective stage, and to allow anuran hosts to disperse widely (thus reducing the transfer of directly transmitted parasites between hosts). Conversely, dry conditions induce toads to aggregate in moist dry-season refugia where conditions may be more conducive to direct transmission of infective parasitic larvae between hosts.

  14. Soil and Rhizosphere Associated Fungi in Gray Mangroves (Avicennia marina) from the Red Sea--A Metagenomic Approach.

    Science.gov (United States)

    Simões, Marta Filipa; Antunes, André; Ottoni, Cristiane A; Amini, Mohammad Shoaib; Alam, Intikhab; Alzubaidy, Hanin; Mokhtar, Noor-Azlin; Archer, John A C; Bajic, Vladimir B

    2015-10-01

    Covering a quarter of the world's tropical coastlines and being one of the most threatened ecosystems, mangroves are among the major sources of terrestrial organic matter to oceans and harbor a wide microbial diversity. In order to protect, restore, and better understand these ecosystems, researchers have extensively studied their microbiology, yet few surveys have focused on their fungal communities. Our lack of knowledge is even more pronounced for specific fungal populations, such as the ones associated with the rhizosphere. Likewise, the Red Sea gray mangroves (Avicennia marina) remain poorly characterized, and understanding of their fungal communities still relies on cultivation-dependent methods. In this study, we analyzed metagenomic datasets from gray mangrove rhizosphere and bulk soil samples collected in the Red Sea coast, to obtain a snapshot of their fungal communities. Our data indicated that Ascomycota was the dominant phylum (76%-85%), while Basidiomycota was less abundant (14%-24%), yet present in higher numbers than usually reported for such environments. Fungal communities were more stable within the rhizosphere than within the bulk soil, both at class and genus level. This finding is consistent with the intrinsic patchiness in soil sediments and with the selection of specific microbial communities by plant roots. Our study indicates the presence of several species on this mycobiome that were not previously reported as mangrove-associated. In particular, we detected representatives of several commercially-used fungi, e.g., producers of secreted cellulases and anaerobic producers of cellulosomes. These results represent additional insights into the fungal community of the gray mangroves of the Red Sea, and show that they are significantly richer than previously reported.

  15. Arquitectura y poder local: los orígenes de la comandancia de marina de Las Palmas

    Directory of Open Access Journals (Sweden)

    Javier Márquez Quevedo

    2013-10-01

    Full Text Available La construcción de edificaciones representativas del poder ha sido siempre una constante. En el caso de Canarias, una región pobre y alejada del centro político de Estado, esta arquitectura tomó una gran relevancia debido a su escasez. En una etapa de creciente rivalidad entre la capital provincial, Santa Cruz de Tenerife, y Las Palmas, ciudad que despuntaba con el auge del Puerto de La Luz, el deseo de contar cuanto antes con un vistoso edificio para la Comandancia de Marina tuvo un evidente objetivo político. Este artículo es un breve repaso a los orígenes de esta construcción y sus dificultades para realizarla.The representative authority building has ever been manifest. In Canary Islands, needy and distant region from metropolis, this architecture obtains large importance owing to her shortness. In the times of increasing competition between the chief town, Santa Cruz de Tenerife, and Las Palmas, one place that expanding through Puerto de La Luz’s summit, to have a desire to count upon a showy commandership building rapidly it was an obvious political objective. In this essay, we will analyse the origins of this building and the objections in order to achieve it.

  16. Soil and Rhizosphere Associated Fungi in Gray Mangroves (Avicennia marina) from the Red Sea-A Metagenomic Approach

    Institute of Scientific and Technical Information of China (English)

    Marta Filipa Simoes; Andre Antunes; Cristiane A Ottoni; Mohammad Shoaib Amini; Intikhab Alam; Hanin Alzubaidy; Noor-Azlin Mokhtar; John AC Archer; Vladimir B Bajic

    2015-01-01

    Covering a quarter of the world’s tropical coastlines and being one of the most threat-ened ecosystems, mangroves are among the major sources of terrestrial organic matter to oceans and harbor a wide microbial diversity. In order to protect, restore, and better understand these ecosystems, researchers have extensively studied their microbiology, yet few surveys have focused on their fungal communities. Our lack of knowledge is even more pronounced for specific fungal populations, such as the ones associated with the rhizosphere. Likewise, the Red Sea gray man-groves (Avicennia marina) remain poorly characterized, and understanding of their fungal commu-nities still relies on cultivation-dependent methods. In this study, we analyzed metagenomic datasets from gray mangrove rhizosphere and bulk soil samples collected in the Red Sea coast, to obtain a snapshot of their fungal communities. Our data indicated that Ascomycota was the dominant phylum (76%–85%), while Basidiomycota was less abundant (14%–24%), yet present in higher numbers than usually reported for such environments. Fungal communities were more stable within the rhizosphere than within the bulk soil, both at class and genus level. This finding is consistent with the intrinsic patchiness in soil sediments and with the selection of specific microbial communities by plant roots. Our study indicates the presence of several species on this mycobiome that were not previously reported as mangrove-associated. In particular, we detected representatives of several commercially-used fungi, e.g., producers of secreted cellulases and anaerobic producers of cellulosomes. These results represent additional insights into the fungal community of the gray mangroves of the Red Sea, and show that they are significantly richer than previously reported.

  17. 18O labeling of chlorophyll d in Acaryochloris marina reveals that chlorophyll a and molecular oxygen are precursors.

    Science.gov (United States)

    Schliep, Martin; Crossett, Ben; Willows, Robert D; Chen, Min

    2010-09-10

    The cyanobacterium Acaryochloris marina was cultured in the presence of either H(2)(18)O or (18)O(2), and the newly synthesized chlorophylls (Chl a and Chl d) were isolated using high performance liquid chromatography and analyzed by mass spectroscopy. In the presence of H(2)(18)O, newly synthesized Chl a and d, both incorporated up to four isotopic (18)O atoms. Time course H(2)(18)O labeling experiments showed incorporation of isotopic (18)O atoms originating from H(2)(18)O into Chl a, with over 90% of Chl a (18)O-labeled at 48 h. The incorporation of isotopic (18)O atoms into Chl d upon incubation in H(2)(18)O was slower compared with Chl a with approximately 50% (18)O-labeled Chl d at 115 h. The rapid turnover of newly synthesized Chl a suggested that Chl a is the direct biosynthetic precursor of Chl d. In the presence of (18)O(2) gas, one isotopic (18)O atom was incorporated into Chl a with approximately the same kinetic incorporation rate observed in the H(2)(18)O labeling experiment, reaching over 90% labeling intensity at 48 h. The incorporation of two isotopic (18)O atoms derived from molecular oxygen ((18)O(2)) was observed in the extracted Chl d, and the percentage of double isotopic (18)O-labeled Chl d increased in parallel with the decrease of non-isotopic-labeled Chl d. This clearly indicated that the oxygen atom in the C3(1)-formyl group of Chl d is derived from dioxygen via an oxygenase-type reaction mechanism.

  18. 18O Labeling of Chlorophyll d in Acaryochloris marina Reveals That Chlorophyll a and Molecular Oxygen Are Precursors*

    Science.gov (United States)

    Schliep, Martin; Crossett, Ben; Willows, Robert D.; Chen, Min

    2010-01-01

    The cyanobacterium Acaryochloris marina was cultured in the presence of either H218O or 18O2, and the newly synthesized chlorophylls (Chl a and Chl d) were isolated using high performance liquid chromatography and analyzed by mass spectroscopy. In the presence of H218O, newly synthesized Chl a and d, both incorporated up to four isotopic 18O atoms. Time course H218O labeling experiments showed incorporation of isotopic 18O atoms originating from H218O into Chl a, with over 90% of Chl a 18O-labeled at 48 h. The incorporation of isotopic 18O atoms into Chl d upon incubation in H218O was slower compared with Chl a with ∼50% 18O-labeled Chl d at 115 h. The rapid turnover of newly synthesized Chl a suggested that Chl a is the direct biosynthetic precursor of Chl d. In the presence of 18O2 gas, one isotopic 18O atom was incorporated into Chl a with approximately the same kinetic incorporation rate observed in the H218O labeling experiment, reaching over 90% labeling intensity at 48 h. The incorporation of two isotopic 18O atoms derived from molecular oxygen (18O2) was observed in the extracted Chl d, and the percentage of double isotopic 18O-labeled Chl d increased in parallel with the decrease of non-isotopic-labeled Chl d. This clearly indicated that the oxygen atom in the C31-formyl group of Chl d is derived from dioxygen via an oxygenase-type reaction mechanism. PMID:20610399

  19. Evaluation of anti-HIV-1 activity of a new iridoid glycoside isolated from Avicenna marina, in vitro.

    Science.gov (United States)

    Behbahani, Mandana

    2014-11-01

    This study was carried out to check the efficacy of methanol seed extract of Avicenna marina and its column chromatographic fractions on Peripheral Blood Mono nuclear Cells (PBMCs) toxicity and HIV-1 replication. The anti-HIV-1 activities of crude methanol extract and its fractions were performed by use of real-time polymerase chain reaction (PCR) assay and HIV-1 p24 antigen kit. A time of drug addiction approach was also done to identify target of anti-HIV compound. The activity of the extracts on CD4, CD3, CD19 and CD45 expression in lymphocytes population was performed by use of flow cytometry. The most active anti-HIV agent was detected by spectroscopic analysis as 2'-O-(4-methoxycinnamoyl) mussaenosidic acid. The apparent effective concentrations for 50% virus replication (EC50) of methanol extract and iridoid glycoside were 45 and 0.1 μg/ml respectively. The iridoid glycoside also did not have any observable effect on the proportion of CD4, CD3, CD19 and CD45 cells or on the intensity of their expressions on PBMCs. In addition, the expression level of C-C chemokine receptor type 5 (CCR5) and chemokine receptor type 4 (CXCR4) on CD4(+) T cells were decreased in cells treated with this iridoid glycoside. The reduction of these two HIV coreceptors and the result of time of addition study demonstrated that this iridoid glycoside restricts HIV-1 replication on the early stage of HIV infection. Copyright © 2014 Elsevier B.V. All rights reserved.

  20. Poliquetos (Annelida: Polychaeta como indicadores biológicos de contaminación marina: casos en Colombia

    Directory of Open Access Journals (Sweden)

    Vanessa Fernández Rodríguez

    2015-06-01

    Full Text Available El concepto de Indicador Biológico ha sido usado sin mayor precaución al momento de emplear ciertos organismos en programas de monitoreo ambiental, lo cual genera confusión. Uno de los objetivos de este trabajo fue resaltar la importancia en la consolidación de una definición precisa de este concepto a partir de información disponible, proponiendo una definición para el mismo. Las características ecológicas de los poliquetos permiten que, al estar en contacto permanente con diferentes tipos de contaminantes, respondan bioacumulando, disminuyendo o aumentando su abundancia, según sea la especie, hecho que posiciona este tipo de organismos como potenciales indicadores de contaminación marina. En este artículo se presenta de manera concreta un análisis de la literatura disponible para poliquetos en el campo de los indicadores biológicos, resaltando cómo éstos han sido usados en diferentes metodologías, con ejemplos a internacionales, así como una selección especial para Colombia. De los resultados más sobresalientes se encontró que Capitella capitata es la especie más estudiada al estar asociada con ambientes contaminados a causa del incremento de materia orgánica y es la única especie reportada en el país como indicador biológico usando las técnicas clásicas de bioindicación. Finalmente, se reitera la importancia de iniciar investigaciones sobre los aspectos ecológicos, ecotoxicológicos y bioensayos de laboratorio con otras especies de poliquetos para validar cuáles especies y por qué pueden ser consideradas como indicadores biológicos para el país.

  1. Differences in benthic fauna and sediment among mangrove ( Avicennia marina var. australasica) stands of different ages in New Zealand

    Science.gov (United States)

    Morrisey, D. J.; Skilleter, G. A.; Ellis, J. I.; Burns, B. R.; Kemp, C. E.; Burt, K.

    2003-03-01

    Management of coastal environments requires understanding of ecological relationships among different habitats and their biotas. Changes in abundance and distribution of mangroves, like those of other coastal habitats, have generally been interpreted in terms of changes in biodiversity or fisheries resources within individual stands. In several parts of their range, anthropogenically increased inputs of sediment to estuaries have led to the spread of mangroves. There is, however, little information on the relative ecological properties, or conservational values, of stands of different ages. The faunal, floral and sedimentological properties of mangrove ( Avicennia marina var. australasica) stands of two different ages in New Zealand has been compared. Older (>60 years) and younger (3-12 years) stands showed clear separation on the basis of environmental characteristics and benthic macrofauna. Numbers of faunal taxa were generally larger at younger sites, and numbers of individuals of several taxa were also larger at these sites. The total number of individuals was not different between the two age-classes, largely due to the presence of large numbers of the surface-living gastropod Potamopyrgus antipodarum at the older sites. It is hypothesized that as mangrove stands mature, the focus of faunal diversity may shift from the benthos to animals living on the mangrove plants themselves, such as insects and spiders, though these were not included in the present study. Differences in the faunas were coincident with differences in the nature of the sediment. Sediments in older stands were more compacted and contained more organic matter and leaf litter. Measurement of leaf chemistry suggested that mangrove plants in the younger stands were able to take up more N and P than those in the older stands.

  2. Modelado de la circulación marina y descargas hipotéticas en la Bahía del Callao, Perú.

    OpenAIRE

    2008-01-01

    El objetivo de este informe, es simular la circulación marina y las descargas hipotéticas en la bahía del Callao, teniendo en cuenta las variaciones estacionales climatológicas y considerando la dirección e intensidad de los forzantes de viento. Se usó el modelo ROMS (Regional Oceanic Model System) con la herramienta de anidamiento AGRIF (Adaptive Grid Refinement in Fortran). Se usó una batimetría híbrida calculada a partir de las bases de datos de ETOPO2, GEBCO, DHN e IMARPE; vientos de M...

  3. Caracterización ambiental de la zona de alimentación de tortugas marinas en el litoral del municipio de Guasave, Sinaloa.

    OpenAIRE

    2014-01-01

    Las áreas marinas protegidas (AMPs) son herramientas de conservación muy relevantes para la protección de ecosistemas y para contribuir a generar un uso adecuado de los recursos naturales. La zona marino costera del municipio de Guasave se encuentra ubicada en la región sur del Golfo de California en un área de surgencias costeras estacionales y en la que ocurren una gran cantidad de especies de importancia comercial así como de interés para la conservación. Estudios previos han caracterizado...

  4. Visiones desde dentro. La insurrección cubana a través del Diario de la Marina y Bohemia (1956-1958

    Directory of Open Access Journals (Sweden)

    Patricia Calvo GONZÁLEZ

    2014-12-01

    Full Text Available El artículo reflexiona sobre el papel el papel desempeñado por la prensa cubana durante la insurrección de finales de los años cincuenta. Para ello nos hemos centrado en el análisis de dos publicaciones específicas: Diario de la Marina y Bohemia. Su diferente periodicidad y línea editorial permiten obtener una visión global del funcionamiento mediático de la isla durante el levantamiento que finalmente derrocaría a Batista y daría paso a la Revolución Cubana.

  5. Hilo de vida – hilo de muerte. El conflicto de la creación en la obra de Marina Tsvietaieva

    OpenAIRE

    Aguirre Martínez, Guillermo

    2012-01-01

    This article goes deep into the work of the Russian poetess Marina Tsvietáieva to stablish a relationship between the author herself and the myth of Arachne. This approach offers the possibility to understand the myth according to the artistic attitude of Tsvietáieva. Our work is settled by the pride and the pressing need of both Arachne and Tsvietáieva to impose the artistic creation over any other belief or reality. This prospect sets also a nexus for a better understanding of the existing ...

  6. An examination of photoacclimatory responses of Zostera marina transplants along a depth gradient for transplant-site selection in a disturbed estuary

    Science.gov (United States)

    Li, Wen-Tao; Kim, Seung Hyeon; Kim, Jae Woo; Kim, Jong-Hyeob; Lee, Kun-Seop

    2013-02-01

    Growth and photosynthetic responses of Zostera marina transplants along a depth gradient were examined to determine appropriate transplanting areas for seagrass restoration. Seagrass Z. marina was once widely distributed in the Taehwa River estuary in southeastern Korea, but has disappeared since the 1960s due to port construction and large scale pollutant inputs from upstream industrial areas. Recently, water quality has been considerably improved as a result of effective sewage treatment, and the local government is attempting to restore Z. marina to the estuary. For seagrass restoration in this estuary, a pilot transplantation trial of Z. marina at three water depths (shallow: 0.5 m; intermediate: 1.5 m; deep: 2.5 m relative to MLLW) was conducted in November 2008. The transplant shoot density increased gradually at the intermediate and deep sites, whereas the transplants at the shallow site disappeared after 3 months. To find the optimal transplantation locations in this estuary, the growth and photosynthetic responses of the transplants along a depth gradient were examined for approximately 4 months following transplantation in March 2009. In the 2009 experimental transplantation trial, shoot density of transplants at the shallow site was significantly higher than those at the intermediate and deep sites during the first 3 months following transplantation, but rapidly decreased approximately 4 months after transplantation. The chlorophyll content, photosynthetic efficiency (α), and maximum quantum yield (Fv/Fm) of the transplants were significantly higher at the deep site than at the shallow site. Shoot size, biomass and leaf productivity were also significantly higher at the deep site than at the shallow site. Although underwater irradiance was significantly lower at the deep site than at the shallow site, transplants at the deep site were morphologically and physiologically acclimated to the low light. Transplants at the shallow site exhibited high

  7. An Assessment of the Accumulation Potential of Pb, Zn and Cd by Avicennia marina (Forssk. Vierh. in Vamleshwar Mangroves, Gujarat, India

    Directory of Open Access Journals (Sweden)

    Isaiah Nirmal KUMAR

    2011-03-01

    Full Text Available The study deals with the accumulation of Pb, Zn and Cd in an important mangrove species, Avicennia marina (Forssk. Vierh., in the Vamleshwar mangrove ecosystem, near Narmada estuary, West coast of Gujarat, India with height differences of 0.5, 1.5, 2.5 meters and carried out under field conditions during October, 2009. The site was located on 21�30�11.55�� N latitude and 72�43�53.68�� E longitude. Mangrove receives heavy metal pollution from upstream areas of Narmada estuary and highly populated settlements. However, little is known about the capacity of mangrove plants to take up and store heavy metals in them. Water, sediment and plant parts such as roots, stems and leaves were analyzed for finding the trace metal accumulation of different height groups by Inductive Coupled Plasma Analyser (ICPA. Amount of the content of metals found in the water, sediment and plant parts were in the order of Pb>Zn>Cd. The average contents of heavy metals in the waters were 57.83 mg l-1 for Pb, 3.89 83 mg l-1 for Zn and 0.42 mg l-1 for Cd. It was observed that the average contents of Pb (73.6 mg l-1, Zn (8.1 mg l-1 and Cd (0.73 mg l-1 in the sediments were below the critical soil concentrations. The concentrations of heavy metals in different parts of Avicennia marina were in the order Roots>stem>leaf except for Cd, but Cd found higher in leaf. The ranges of the content of heavy metals in plants were 18.5-102.2 mg l-1 for Pb, 3.5-19.5 mg l-1 for Zn and 0.2-4.1 mg l-1 for Cd. The concentrations of all heavy metals in Avicennia marina except Pb were falling within the normal range and were much more in the plants have the highest height. The present study has shown the potential of Avicennia marina as a phytoremediation species for selected heavy metals in many mangrove ecosystems.

  8. El régimen internacional de la bioinvasión marina causada por agua de lastre: especial referencia a la República de Colombia

    OpenAIRE

    Ramírez Cabrales, Fabián

    2015-01-01

    El agua de lastre de los buques es considerada como el más importante vector para el desplazamiento transoceánico de especies marinas propias de aguas superficiales a nuevos ambientes marinos. Se ha estimado que anualmente se transfieren de 3 a 5 billones de toneladas de agua de lastre a nivel global. Ello plantea un serio riesgo ambiental internacional. Las especies invasivas están extendiendo sus ámbitos naturales a nivel global y cada nueve semanas se notifica una nueva invasión biológica ...

  9. Lista de esponjas marinas asociadas al arrecife Tuxpan, Veracruz, México Checklist of marine sponges from Tuxpan Reef, Veracruz, Mexico

    OpenAIRE

    Carlos González-Gándara; Abelardo Patiño-García; Uribe Asís-Anastasio; Arturo Serrano; Patricia Gómez

    2009-01-01

    Se presenta la lista de esponjas marinas (Porifera: Demospongiae) del arrecife Tuxpan, Veracruz, México, colectadas en 2004, 2005 y 2006 mediante buceo libre y con equipo autónomo SCUBA. Los resultados muestran la presencia de 18 especies pertenecientes a 13 géneros y 13 familias, 17 de estas especies son nuevos registros para los arrecifes coralinos del norte de Veracruz y una (Aplysina cauliformis Carter, 1882) para el estado. La información puede auxiliar para definir las estrategias de ma...

  10. Análisis multicriterio del impacto potencial del turismo en la anidación de las tortugas marinas en Chalacatepec, Jalisco

    OpenAIRE

    Y. Flores-Monter; F. Aceves-Quesada; García-Romero, A.; E.M. Peters Recagno

    2015-01-01

    Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV), un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a) Preparación y construcción y b) Operación y ...

  11. Los colores de las conchas marinas en el antiguo occidente de México. El caso del Posclásico

    OpenAIRE

    Luis Gómez Gastélum

    2007-01-01

    A partir de los estudios sobre la cosmovisión mesoamericana –en especial aquellos relacionados con el cuerpo humano y las signifi caciones del color–, se analizan los patrones de uso de las conchas marinas y los objetos elaborados con éstas en las sociedades prehispánicas del occidente de México durante el periodo Posclásico (1100-1350 d.C.), con la fi nalidad de acercarse al simbolismo que les fueron otorgados por parte de quienes las utilizaron.

  12. La acuariofilia de especies ornamentales marinas: un mercado de retos y oportunidades Ornamental marine fishkeeping: a trade of challenges and opportunities

    Directory of Open Access Journals (Sweden)

    Fabiola Lango Reynoso

    2012-03-01

    Full Text Available La industria de la acuariofilia es un mercado que se encuentra en expansión. Aun cuando no existe información exacta respecto a cifras y valores del comercio internacional, se calcula que esta industria genera ganancias sobre US$ 300 millones con una tasa de crecimiento anual del 14%. De esta cifra, aproximadamente US$ 28 a 44 millones corresponden a peces ornamentales de origen marino. No obstante, una de las controversias que ha generado el comercio de especies marinas es que casi la totalidad de los organismos son capturados del medio natural, y en muchos casos de manera ilegal. En este trabajo se realiza una revisión que incluye: historia de la acuariofilia, principales especies ornamentales de importancia comercial, comercio internacional, riesgos del comercio de especies marinas, estrategias de conservación y situación actual en México. En este último tema, se abordan aspectos que describen el desarrollo y perspectivas del mercado de la acuariofilia marina y algunas iniciativas de instituciones académicas y privadas dirigidas al desarrollo de la acuicultura sostenible de especies marinas de ornato de importancia comercial en el país.The aquariums industry is a trade that is expanding. Although there is no accurate information regarding the figures of the aquarium industry in the international scenario, it is estimated to generate revenues over US$ 300 million with an annual growth rate of 14%. Approximately US$ 28 to 44 million of this amount is generated by the ornamental marine fish trade. However, the trade in marine species has aroused controversy regarding the extraction of almost all traded marine organisms from wild populations and, in many cases, illegally. This paper presents a review that includes: the ornamental marine fishkeeping history, the species of commercial importance, the international trade scenario, risks of the aquarium industry, conservation strategies, and the current situation of this trade in Mexico. The

  13. Análisis multicriterio del impacto potencial del turismo en la anidación de las tortugas marinas en Chalacatepec, Jalisco

    OpenAIRE

    Y. Flores-Monter; F. Aceves-Quesada; A. García-Romero; E.M. Peters Recagno

    2015-01-01

    Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV), un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a) Preparación y construcción y b) Operación y ...

  14. Estudio regional sobre las dimensiones sociales en el manejo de areas marinas protegidas: casos en Costa Rica, Nicaragua, Honduras y Panama

    OpenAIRE

    Rivera, Vivienne Solís; Borrás, Marvin Fonseca; Gallardo, Daniela Barguil; Ochoa, Mariela; Castañeda, Edgar; Castillo, Geodisio

    2012-01-01

    Explora la percepción de las personas residentes en las comunidades costeras vinculadas a los espacios marinos protegidos en Honduras, Nicaragua, Costa Rica y Panamá. Profundiza, a partir de estudios de caso y el análisis comparativo, los temas de gobernanza, derechos humanos y distribución justa y equitativa de beneficios derivados de la conservación. Los resultados destacan que los esfuerzos de conservación marina no han logrado establecer puentes que permitan satisfacer las necesidades so...

  15. Antecedentes de las Áreas Marinas Costeras Protegidas de Múltiples Usos de Chile. Documento de apoyo a guía docente AMCP-MU. Proyecto GEF MARINO.

    OpenAIRE

    Urra Parra, Helen; Vliegenthart, Ana María; Donoso, Magdalena

    2008-01-01

    Este documento fue diseñado para apoyar la construcción de la institucionalidad de las Áreas Marinas Protegidas, aportando al necesario cambio cultural de la ciudadanía, de tal forma que sea coherente con el conjunto de leyes, reglamentos, normas, acuerdos, instancias, entre otros mecanismos que se generen para la sustentabilidad de las Áreas Marinas y Costeras Protegidas de Múltiples Usos (AMCP – MU), cuya creación ya se inició en Chile.

  16. Caracterización toxicológica de las macroalgas marinas Hypnea spp y Sargasun spp para la futura utilización en la alimentación y la salud animal como humana

    OpenAIRE

    Vladimir Barrios González; Roberto Castillo; Ivanhoe González Sánchez; Lourdes Savón Valdés :

    2007-01-01

    El estudio y la investigación creciente en la industria alimenticia, farmacológica así como en la cosmeticología ha provocado que se analicen variantes novedosas como las macroalgas marinas. La moderna agricultura como ciencia, además del cultivo y explotación racional de los peces, crustáceos y moluscos, contempla una importante área de investigación y desarrollo como lo son las macroalgas marinas. Las algas constituyen el primer eslabón de la cadena trófica que más eficientemente aprovec...

  17. Bacterias marinas productoras de compuestos antibacterianos aisladas a partir de invertebrados intermareales Marine bacteria producing antibacterial compounds Isolated from inter-tidal invertebrates

    Directory of Open Access Journals (Sweden)

    Jorge León

    2010-06-01

    Full Text Available Se realizó actividades prospectivas de muestreo de invertebrados intermareales en la Bahía de Ancón (Lima - Perú con el objetivo de seleccionar bacterias marinas productoras de sustancias antimicrobianas. El estudio comprendió el aislamiento de bacterias en agar marino, pruebas de susceptibilidad antimicrobiana in vitro y observaciones de microscopía electrónica. Se reporta el aislamiento, caracterización fenotípica y propiedades antimicrobianas de diez cepas de bacterias marinas que incluyen a los géneros Vibrio, Pseudomonas y Flavobacterium y del orden Actinomycetal que inhiben a patógenos de humanos. Los resultados indicarían que los invertebrados marinos serían fuentes de bacterias productoras de sustancias antibióticas.Prospective sampling activities of intertidal invertebrates in the Ancon Bay (Lima, Peru were done in order to select marine bacteria producing antimicrobial substances. The study included the isolation of bacteria in marine agar, in vitro antimicrobial susceptibility testing and electronic microscopic observations. We report the isolation, phenotypical characterization and antimicrobial properties of 10 strains of marine bacteria including the genus Vibrio, Pseudomonas, and Flavobacterium, and the order Actinomycetae that inhibit human pathogens. The results indicate that the marine invertebrates would be sources of bacteria producing antibiotic substances.

  18. Presencia de bacterias asociadas a nieve marina en arrecifes influenciados por escorrentía continental del Caribe colombiano: primer acercamiento

    Directory of Open Access Journals (Sweden)

    Hernán Alejandro Henao-Castro

    2015-06-01

    Full Text Available Parte del deterioro de los arrecifes de coral se atribuye al efecto del aporte de agua dulce cargada de nutrientes y sedimentos finos. Estas condiciones favorecen la formación de nieve marina lodosa que transporta gran carga de bacterias que pueden ser patógenos de corales. Por lo anterior, se estudió la presencia de bacterias asociadas a nieve marina lodosa en una zona arrecifal del Caribe colombiano en un gradiente de distancia a la desembocadura del canal del Dique (Cartagena. Por medio de técnicas moleculares PCR-DGGE, se registró baja riqueza, con bandas representativas de siete bacterias diferentes. El número de especies varió según el sitio, pero no hubo relación con la cercanía a la fuente de escorrentía. Como estudio pionero, sirve como punto de partida para estudios en arrecifes del Caribe colombiano impactados por escorrentía.

  19. Characterisation of sulphide-bearing waste-rock dumps using electrical resistivity imaging: the case study of the Rio Marina mining district (Elba Island, Italy).

    Science.gov (United States)

    Mele, Mauro; Servida, Diego; Lupis, Domenico

    2013-07-01

    Sulphide-bearing mine dumps are potential sources of pollution when acid mine drainage (AMD) occurs. Because the generation of AMD depends on the volume and composition of waste materials, their characterisation is crucial for the evaluation of geochemical hazards and for the design of remediation strategies to minimise their environmental impact. In this paper, a cost-effective strategy for the characterisation of an inactive mine dump in the Rio Marina mining district (Elba Island, Italy) using earth resistivity imaging (ERI) is presented. As no information regarding the nature of waste rocks is found in reports for the mine, five ERI profiles were acquired at the top of the waste pile. The results show that waste rocks are heterogeneous with a maximum thickness of 30 m. Due to the large amounts of dispersed sulphide minerals, the waste rocks are characterised by an electrically conductive geophysical signature in comparison to the surrounding resistive metamorphic bedrock. A geostatistical approach was adopted to estimate the elevation of the edges of the mine dump, and the net volume of the waste rocks was computed through a raster analysis of the elevations of the upper and lower boundaries of the mine dump. High-conductivity anomalies were detected within the core of the mine dump. The integration of the hydrogeological, geochemical and geological framework of the Rio Marina mining district suggests that these anomalies could be a geophysical signature of subsurface regions where AMD is currently generated or stored, thus representing sources of environmental pollution.

  20. Spatial and diurnal distribution of invertebrate and fish fauna of a Zostera marina bed and nearby unvegetated sediments in Damariscotta River, Maine (USA)

    Science.gov (United States)

    Mattila, Johanna; Chaplin, Glen; Eilers, Michele R.; Heck, Kenneth L.; O'Neal, Jonathan P.; Valentine, John F.

    1999-06-01

    Fish, epibenthos and macroinfauna were collected in a Zostera marina bed and nearby unvegetated sediments in the estuary of the Damariscotta River, on the mid-coast of Maine. Samples of epibenthic fauna and fish were collected at low tides both during day and night, and samples of infauna at low tides during the day. The mean density of Zostera shoots in the study area was 335 m -2. Abundance and species number of fish were greater at night than during the day and greater in eelgrass beds ( Z. marina) than in unvegetated habitats. Daytime fish collections were dominated by Atlantic silversides ( Medinia medinia), while juvenile winter flounder ( Pseudopleuronectes americanus) dominated night collections. Also Zostera-associated epifaunal abundances and number of species were significantly higher at night than during the day. Mysis stenolepis, Idotea balthica and Littorina obtusata were dominant species in the epifauna samples. Of the total of 37 invertebrate species encountered, only five occurred both in the infaunal and epifaunal samples. Nineteen different taxa were collected from the benthic core samples. The most abundant invertebrate infaunal taxa were sipunculids, the polychaete Nereis virens, and oligochaetes. Infaunal invertebrate abundances and species diversity were significantly higher in eelgrass beds than in unvegetated sediments. The abundance and number of species of benthic invertebrates were also positively correlated to seagrass biomass. Community diversity values ( H') were relatively low but fit well in the general pattern of decreasing diversity towards northern latitudes.

  1. Distribution patterns of Syllidae (Annelida: Polychaeta from seagrass (Zostera marina and Z. noltei meadows in the Ensenada de O Grove (Galicia, NW Spain

    Directory of Open Access Journals (Sweden)

    Patricia Quintas

    2013-09-01

    Full Text Available This paper describes the distribution and composition of the syllid fauna inhabiting seagrass meadows in the Ensenada de O Grove (NW Spain. Samples were collected on muddy sediments colonized by either Zostera marina L., Zostera noltei Hornemann or by a mixed meadow with both species. Syllids were dominant (13340 individuals; 37% of total polychaete abundance, including 22 species (12 genera. The mixed meadows housed the highest number of species and the Z. noltei meadow had practically no syllids. The dominant species were Exogone naidina, Parapionosyllis elegans, Parexogone hebes and Prosphaerosyllis campoyi ( > 80% of total abundance. Carnivores (mainly species of Parapionosyllis, Amblyosyllis, and Streptosyllis were dominant, especially in muddy sand with either Z. marina or Z. noltei and sandy mud with a mixed meadow. The most important abiotic variables for explaining the composition and distribution of the syllid fauna were bottom water salinity, sorting coefficient and carbonate content. The highest number of species was recorded at sites with a high salinity and carbonate content and the lowest at sites with a high sorting coefficient.

  2. Nitrosomonas Nm143-like ammonia oxidizers and Nitrospira marina-like nitrite oxidizers dominate the nitrifier community in a marine aquaculture biofilm.

    Science.gov (United States)

    Foesel, Bärbel U; Gieseke, Armin; Schwermer, Carsten; Stief, Peter; Koch, Liat; Cytryn, Eddie; de la Torré, José R; van Rijn, Jaap; Minz, Dror; Drake, Harold L; Schramm, Andreas

    2008-02-01

    Zero-discharge marine aquaculture systems are an environmentally friendly alternative to conventional aquaculture. In these systems, water is purified and recycled via microbial biofilters. Here, quantitative data on nitrifier community structure of a trickling filter biofilm associated with a recirculating marine aquaculture system are presented. Repeated rounds of the full-cycle rRNA approach were necessary to optimize DNA extraction and the probe set for FISH to obtain a reliable and comprehensive picture of the ammonia-oxidizing community. Analysis of the ammonia monooxygenase gene (amoA) confirmed the results. The most abundant ammonia-oxidizing bacteria (AOB) were members of the Nitrosomonas sp. Nm143-lineage (6.7% of the bacterial biovolume), followed by Nitrosomonas marina-like AOB (2.2% of the bacterial biovolume). Both were outnumbered by nitrite-oxidizing bacteria of the Nitrospira marina-lineage (15.7% of the bacterial biovolume). Although more than eight other nitrifying populations were detected, including Crenarchaeota closely related to the ammonia-oxidizer 'Nitrosopumilus maritimus', their collective abundance was below 1% of the total biofilm volume; their contribution to nitrification in the biofilter is therefore likely to be negligible.

  3. Red de Repositorios IODE/COI/Unesco de acceso abierto en Ciencias Marinas en América Latina y el Caribe: OceanDocs

    Directory of Open Access Journals (Sweden)

    Andrea Cristiani

    2014-03-01

    Full Text Available Se presenta la organización, funciones y evolución de la red de repositorios de acceso abierto OceanDocs, particularmente la experiencia de instituciones vinculadas a las Ciencias Marinas en América Latina y el Caribe. En el marco de las Redes de Datos e Información Oceanográfica de la Comisión Oceanográfica Intergubernamental (COI de UNESCO, surgieron iniciativas de repositorios locales y regionales, que más tarde se consolidan y dan lugar a la red internacional de repositorios en Ciencias Marinas:  OceanDocs. En la actualidad esta red está integrada por repositorios institucionales, repositorios regionales y un repositorio central alojado por la COI. OceanDocs cuenta con políticas comunes definidas, un Grupo Directivo conformado por especialistas de distintas áreas que planifica y establece las directrices para la red, coordinadores nacionales y regionales, Unidades de Información a nivel institucional responsables de la carga de documentos, y una creciente comunidad de usuarios a nivel global.

  4. Evaluación biológica de una fracción de la esponja marina Topsentia ophiraphidites del Caribe colombiano

    Directory of Open Access Journals (Sweden)

    Lina Blandón G.

    2013-10-01

    Full Text Available Objetivo. Evaluar la actividad antiproliferativa y genotóxica de una fracción con actividad citotóxica obtenida de la esponja marina del Caribe colombiano Topsentia ophiraphidites (Fracción T4. Materiales y métodos. La fracción T4 de la esponja marina Topsentia ophiraphidites fue obtenida en el laboratorio de Productos Naturales Marinos de la Universidad de Antioquia. La actividad antiproliferativa se evaluó mediante ensayos de eficiencia de clonación, función de acumulación y cinética proliferativa por intercambio de cromátidas hermanas (ICH; la actividad genotóxica se evaluó mediante electroforesis en gel de células individuales (Ensayo cometa e intercambio de cromátidas hermanas (ICH. Todas las pruebas fueron realizadas sobre las líneas celulares Jurkat y CHO. Resultados. La fracción T4 afectó el ciclo celular de las células CHO y mostró daño genotóxica crónico en las células Jurkat. Conclusiones. Se recomienda la evaluación de la fracción T4 en otras líneas celulares derivadas de tumor con el fin de determinar un posible efecto diferencial, además de evaluar otras actividades de tipo antimicrobiano, antimalárico, entre otros.

  5. Autophagy Inhibition Enhances the Mitochondrial-Mediated Apoptosis Induced by Mangrove (Avicennia marina) Extract in Human Breast Cancer Cells

    KAUST Repository

    Esau, Luke

    2015-01-10

    Aims: Avicennia marina (AM) is a widely distributed mangrove plant that has been used in traditional medicine for centuries for the treatment of a number of diseases. The objective of the present study was to evaluate the leaf ethyl acetate extract of AM for its cytotoxic and apoptotic potential along with in-depth investigations of its mechanism of action in breast cancer MCF-7 cells. Study Design: The ethyl acetate extract of leaves and stems of AM was tested against estrogen positive breast cancer cell line MCF-7 using various assays. Place and Duration of Study: The study was carried out at King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, from July 2013-June 2014. Methodology: Dose- and time-dependent growth inhibition of cancer cells was measured using MTT assay. The mechanisms of apoptosis induction were determined using various assays: phosphatidylserine exposure, caspase-3/7 activation, mitochondrial membrane potential disruption, reactive oxygen species (ROS) production, cell cycle analysis, autophagy, and protein expression using western blotting. The modulation of apoptotic genes (p53, Mdm2, NF-kB, Bad, Bax, Bcl-2 and Casp7) was also determined using real time PCR. Results: The AM extract inhibited breast cancer cell growth and induced apoptosis in a concentration dependent manner. We demonstrated a non-classical mode of apoptosis induction in MCF-7 cells by AM extract, where ROS production altered the mitochondrial membrane potential to induce apoptosis. Breast cancer cells treated with 200 µg/ml concentration of AM extract showed increased ROS production and disrupted MMP but no PARP-1 cleavage and a marked decrease in Caspase-7 protein levels (24 and 48 h) were detected. A significant amount of autophagy was also observed at the same concentration. However, treatment of MCF-7 cells with 200 µg/ml of AM extract along with the inhibition of autophagy by chloroquine, significantly increased the apoptosis from 20% to 45

  6. COMPOSICIÓN QUIMICA Y ACTIVIDAD ANTIFOULING DE LA FRACCION LIPIDICA DE LA ESPONJA MARINA Cliona tenuis (Clionidae

    Directory of Open Access Journals (Sweden)

    Leonardo Castellanos

    2009-04-01

    Full Text Available Normal 0 21 false false false st1\\:*{behavior:url(#ieooui } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Del extracto orgánico de la esponja marina Cliona tenuis, recolectada en las Islas del Rosario (Colombia, Mar Caribe, fue obtenida la fracción lipídica, la cual presentó propiedades antifouling en pruebas en campo. Esta fracción fue separada por CC sobre gel de sílice hasta obtener fracciones de ésteres metílicos, glicéridos, glicolípidos, fosfolípidos y ácidos grasos libres, las cuales fueron identificadas por CCD y técnicas de dereplicación (RMN 1H y 13C. Posteriormente, las fracciones de glicéridos, glicolípidos y fosfolípidos fueron hidrolizadas y los ácidos obtenidos, junto con los provenientes de la fracción de ácidos grasos libres, fueron transformados en ésteres metílicos y todos se analizaron por CGAR-EM. Para ubicar las insaturaciones y ramificaciones, los ésteres metílicos se transformaron luego en sus correspondientes pirrolididas, las cuales también se analizaron por CGAR-EM. El estudio cromatográfico (valores de ECL y de los espectros de masas de los ésteres metílicos y de sus derivados pirrolididas permitió identificar 81 ácidos grasos diferentes, de los cuales no habían sido previamente reportados: los ácidos 4,8-hexadecadienoico, 11-metil-4,10-octadecadienoico, 6,9,12,14-icosatetraenoico, y 6,9,12,14,17-icosapentanoico.

  7. Comparación ontogénica de la frecuencia de muda en Rhinella marina (Anura, Bufonidae

    Directory of Open Access Journals (Sweden)

    Teófila M. Triana

    2013-03-01

    Full Text Available La muda es un proceso de renovación de la capa externa de la epidermis (estrato corneo de los anfibios, la cual suministra protección contra daños, patógenos y pérdida de agua. Este trabajo evalúa la frecuencia de muda entre juveniles y adultos de Rhinella marina (Linnaeus, 1758 y la tasa de ocurrencia entre el día y la noche. Para esto, se realizaron dos observaciones diarias (7 am y 7 pm, entre Octubre de 2011 y Marzo de 2012, a tres grupos de individuos clasificados según su tamaño longitud rostro-cloaca, como adultos (promedio=80 mm, juveniles medianos (promedio=19 mm y juveniles pequeños (promedio=13 mm. Estos animales fueron colocados en terrarios en el laboratorio y marcados en el dorso a través de un punto hecho con un corrector de tinta. La muda se determinó por la pérdida total de la marca y una coloración brillante en el dorso. Se encontró una diferencia significativa (Kruskal-Wallis, H=19.84, p<0.0001 en el periodo de muda entre los tres grupos de estudio: adultos=7.5 días, juveniles medianos=5.4 días, juveniles pequeños=5.3 días. También, en la frecuencia de animales que mudaron en el día y la noche (Ji-cuadrado, χ2=7.891, p=0.019, particularmente en los dos grupos de juveniles, quienes lo hicieron en la noche, ya que en los adultos no hubo una diferencia clara. Posiblemente, la mayor frecuencia de la muda en los juveniles puede relacionarse con su condición ontogénica, de un menor tamaño corporal, alta tasa metabólica y mayor tasa de desarrollo.

  8. 河北省1个赤潮藻新记录种——海洋尖尾藻%Oxyrrhis marina-a New Recorded Species of One Red Tide Algae in Hbei Province

    Institute of Scientific and Technical Information of China (English)

    安鑫龙; 李雪梅; 么强

    2011-01-01

    Oxyrrhis marina-a new recorded species of Pyrrophyta was found through indoor micro-observation and this red tide algae was cultured preliminarily.%通过室内显微观察,发现了甲藻门1个新记录种-海洋尖尾藻,并对该赤潮藻进行了初步培养.

  9. Trama trófica de una comunidad de peces en una pradera marina en el Caribe Venezolano

    Directory of Open Access Journals (Sweden)

    Adriana López-Ordaz

    2009-12-01

    Full Text Available Las praderas marinas son consideradas sitios importantes de alimentación para una variedad de especies de peces, por lo que en estos sistemas son frecuentes las interacciones tróficas complejas. En el presente trabajo se describió la trama trófica de la ictiofauna en una pradera marina ubicada en el Caribe Venezolano. Adicionalmente, se propuso una medida de la intensidad de consumo de cada presa (IC, considerando dos variables: la abundancia y la frecuencia de uso. Se realizaron ocho muestreos (en 4 horarios: 6:00, 12:00, 18:00 y 24:00 horas en agosto 2005 y enero 2006. Se capturaron 51 especies pertenecientes a 29 familias siendo Haemulidae la más abundante y se identificaron 28 items alimenticios dentro de los cuales, Crustácea fue el más importante como recurso alimenticio. La importancia de los gremios tróficos considerando la abundancia y la riqueza taxonómica de especies fue: bentófago>herbívoro>piscívoro. Las características de la trama trófica fueron las siguientes: 1 una mayor proporción de cadenas cortas (dos eslabones, 2 un elevado número de especies intermedias. 3 un elevado consumo de bentos, 4 unas bajas intensidades de consumo y 5 un reducido número de especies involucradas en el mayor número de uniones tróficas estimadas. Se obtuvieron diferencias temporales (horarias y mensuales en el número de especies (totales, intermedias y topes, de uniones totales, en la conectividad y en la longitud máxima de cadena. No se observó una variación temporal en la conectancia y sus valores resultaron parecidos a los reportados para otros ambientes marinos con distinta riqueza de especies. Por el contrario, los valores de conectividad resultaron menores a los obtenidos en ambientes con menor riqueza de especies. Como en otros reportes, los parámetros tróficos estimados fueron poco sensibles a los cambios intracomunitarios. IC resultó bajo, a excepción de lo obtenido para los copépodos harpacticoides y las larvas de

  10. Escenarios relacionados con la intrusión marina. Caso de estudio Cuenca Artemisa – Quivicán, Provincia Habana. La Habana – Cuba Escenarios relacionados con la intrusión marina. Caso de estudio Cuenca Artemisa – Quivicán, Provincia Habana. La Habana – Cuba

    Directory of Open Access Journals (Sweden)

    Manuel Núñez Lafitte

    2008-12-01

    Full Text Available Sea water intrusion is the process by which the sea water in an aquifer displaces the sweet water as consequence of a sensitive reduction of the hydraulic head, either for natural actions or for anthropic activity Sea water intrusion takes place in the coastal aquifers mainly independently to the predominant lithology. In this work the scenario analysis is approached by studying the effects that sea water intrusion in dry years would produce to the supply of underground water to the City of Havana and Havana Province, when there would be high exploitation of the aquifers without maintenance of recharge works such as in South Dike.There would be a cartography of the scenario in danger to show the presage of the penetration expressed in the longitude of the marine intrusion wedge, taking as contour conditions the variable that may be unfavorable for their temporal variation, such as precipitation and depression. The thickness of the sheet of sweet water is considered constant.La intrusión marina es el proceso por el cual el agua de mar desplaza en un acuífero el agua dulce como consecuencia de una reducción sensible de la carga hidráulica, ya sea por acciones naturales o por actividad antrópica.La intrusión marina tiene lugar principalmente en los acuíferos costeros independientemente a la litología predominante.En este trabajo se aborda el análisis del escenario que en el abasto de agua subterránea a la Ciudad de La Habana y Provincia Habana produciría la intrusión marina durante la ocurrencias de años secos, simultaneados, con altas explotaciones del acuífero y el no mantenimiento de obras de recarga como es el caso del Dique Sur.Se cartografía el escenario de peligro que muestra el pronóstico de la penetración expresada en longitud de la cuña de intrusión marina tomando como condiciones de contorno las variables que pueden ser desfavorables por su variación temporal, tales como la precipitación, explotación y abatimiento

  11. Diagnóstico y Evaluación de la Calidad de las Aguas Marinas y Costeras del Caribe y Pacífico colombianos. Red de vigilancia para la conservación y protección de las aguas marinas y costeras de Colombia (REDCAM). Informe técnico 2014

    OpenAIRE

    2015-01-01

    El presente informe diagnóstico 2014, contiene la evaluación de la calidad de las aguas marinas y costeras del Caribe y Pacífico colombianos del período lluvioso de 2013 y seco de 2014, contrastado con el análisis histórico de los cambios observados en las diferentes estaciones y departamentos costeros. En el diagnóstico se describe de forma espacial y temporal el comportamiento de las variables fisicoquímicas y microbiológicas, y de los contaminantes (hidrocarburos del petróleo, ...

  12. Korotkije dni / Marina Kutshinskaja

    Index Scriptorium Estoniae

    Kutshinskaja, Marina

    2001-01-01

    Sisu: "Znajesh, ved mjortvõh s pogosta ne nosjat..." ; "Zakurite ot znoja vessennego pervogo solntsa..." ; "Gelsingfors... proiznossitsja redko. Vo vne..." ; "Goroda Skandinavii sinei tainstvennõ..." ; "Morje vsjo-taki lutshshe, tshem oskomina jelei..."

  13. La familia Hemiaulaceae (Bacillariophyceae de las aguas marinas chilenas The family Hemiaulaceae (Bacillariophyceae from marine Chilean waters

    Directory of Open Access Journals (Sweden)

    PATRICIO RIVERA

    2003-12-01

    Full Text Available La familia Hemiaulaceae comprende cuatro géneros, señalados previamente para las aguas chilenas con las siguientes especies: Cerataulina pelagica (Cleve Hendey, Hemiaulus sinensis Greville, H. membranaceus Cleve, Climacodium biconcavum Cleve, Eucampia antarctica (Castracane Mangin, E. cornuta (Cleve Grunow y E. zodiacus Ehrenberg. Sin embargo, el análisis con microscopía fotónica y electrónica de muestras recolectadas en aguas marinas chilenas que contenían representantes de esta familia (incluyendo la mayoría de aquellas estudiadas anteriormente por otros investigadores nacionales reveló que (1 el género Cerataulina está representado por C. pelagica, distribuida a lo largo de la costa chilena entre Arica por el norte y el Estrecho de Magallanes por el sur, (2 el género Eucampia está representado por cuatro taxa: E. zodiacus f. cylindrocornis Syvertsen (señalada en trabajos anteriores como E. zodiacus f. zodiacus, E. zodiacus f. recta Rivera. Avaria & Cruces f. nov. (descrita aquí, E. cornuta y E. antarctica. Los primeros tres taxa se distribuyen en la zona central y norte de Chile, mientras que E. antarctica es propia de las aguas antárticas desde el Estrecho de Magallanes al sur, (3 las citas anteriores de Hemiaulus sinensis, H. membranaceus y Climacodium biconcavum para las aguas chilenas corresponden a determinaciones erróneas de Eucampia zodiacus f. recta, f. nov. Se entregan descripciones de los taxa encontrados y fotografías obtenidas con los microscopios fotónico y electrónicos que ilustran sus principales características morfológicasThe Family Hemiaulaceae comprises four genera, all of which have been previously reported for coastal waters off Chile, and represented by the following taxa: Cerataulina pelagica (Cleve Hendey, Hemiaulus sinensis Greville, H. membranaceus Cleve, Climacodium biconcavum Cleve, Eucampia antarctica (Castracane Mangin, E. cornuta (Cleve Grunow and E. zodiacus Ehrenberg. However, examination

  14. Revisión zoogeográfica marina del sur del Brasil A marine zoogeographical revision of southern Brazil

    Directory of Open Access Journals (Sweden)

    Francisco J Palacio

    1982-01-01

    Full Text Available El estúdio inicial de la fauna y distribución de cefalópodos de Brasil se convirtio en una revisión de la zoogeografía de la región Tropical-Subtropical del sur del Brasil. Observaciones iniciales sobre zoogeografía marina brasileña tuvieron lugar en la primera parte del siglo XIX por naturalistas franceses, principalmente d'Orbigny, trabajando en cefalópodos. Posteriormente, el primer patrón global de provincias zoologicas, definidas por James Dana en 1853 y basadas en zonas de temperaturas oceanicas, colocan el extremo meridional de la fauna tropical del Atlántico Occidental en una latitud de 30ºS, incluyendo una zona de transición (São Paulo entre Rio de Janeiro y Porto Alegre. El análisis detallado de numerosos estúdios subsecuentes en esta región lleva a la confirmación de la validez conceptual de los puntos de vista de d'Orbigny, Dana, Forbes, Woodward y algunos mas durante el siglo pasado. En su tratado zoogeográfico de 1953, Ekman no tuvo a su disposición información adecuada sobre Brasil y señaló vagamente a Rio de Janeiro como el extremo sur de la fauna tropical, basado en la aparente ausencia de manglares y de arrecifes de coral. Este punto de vista ha sido fuente de confusión y debate, especialmente en el siglo XX. Toda la información oceanógrafica, geológica, sedimentaria y faunística acumulada y estudiada hasta el presente señala a la región entre Rio Grande do Sul y Rio de la Plata, como la barrera ecológica fundamental (principalmente debido a cambios de temperatura, en la distribución sur de organismos tropicales. Entre Espirito Santo y Rio Grande do Sul existe una zona de transición faunística caracterizada por complejas variaciones medioambientales estacionales, bajo la influencia alterna y combina de las Corrientes del Brasil y Falkland, en la margen occindetal de la Convergencia Subtropical/Subantartica. Esta zona de transición constituye una provincia biogeografica, designada "Paulista

  15. Crecimiento y estructura demográfica de Argopecten purpuratus en la Reserva Marina La Rinconada, Antofagasta, Chile

    Directory of Open Access Journals (Sweden)

    2005-01-01

    Full Text Available Se presentan los parámetros de crecimiento L∞ = 120.38 mm y K = 0.9668 para el banco de Argopecten purpuratus de la Reserva Marina La Rinconada (Antofagasta, Chile, obtenidos entre marzo de 2001 y mayo de 2003 usando métodos de marcaje y recaptura de ejemplares. La elevada recaptura de individuos marcados (60–80% indica baja mortalidad natural y una conducta sedentaria del recurso. Las evaluaciones anuales realizadas para estimar el tamaño del banco confirmaron tal conducta, encontrándose la mayoría de los individuos agregados en el centro, con densidades que variaron entre años de 9 a 14.8 ind m–2. La abundancia de ejemplares también mostró variabilidad interanual, con cifras de 10.1 × 106 en 2001, 8.2 × 106 en 2002 y 12.4 × 106 en 2003. Estas evaluaciones mostraron, además, una disminución en la talla media de la estructura demográfica del banco entre un año y otro, reduciéndose de 75.8 mm en 2001 a 62.1 mm en 2002 y a 51.7 mm en 2003. Esta disminución también ocurrió con el número de ejemplares mayores o iguales a la talla mínima legal (90 mm, reduciéndose de 2.6 × 106 ejemplares presentes en 2001 a 3.7 × 105 ejemplares en 2003. La aplicación de los parámetros de crecimiento sobre la estructura poblacional del banco entre 2002 y 2003 señaló la integración de una nueva clase anual de 6.5 × 106 de ejemplares en 2002 y de 11.2 × 106 de individuos en 2003. El descuento de estas cifras, del número total de ejemplares presentes en ambos años, demuestra una pérdida cercana a los 8.4 × 106 de ostiones en 2002 y de cerca de 7.0 × 106 de individuos en 2003. Estas pérdidas correspondieron a ejemplares con tallas superiores a los 60 mm, lo cual es corroborado con el análisis de la curva de captura realizado con el programa Fisat, cuyos resultados señalan una mortalidad Z = 2.15 en 2002 para el segmento de la población entre 67.5 y 115.5 mm, y Z = 3.08 en 2003 para el segmento de 64.3 a 112.5 mm. Los

  16. Sintesis icnológica de unidades mesozoicas marinas de la Cuenca Neuquina, nuevos datos y perspectivas

    Directory of Open Access Journals (Sweden)

    Pablo J. Pazos

    2009-10-01

    Full Text Available En este trabajo se realiza unasíntesis icnológica de las unidades marinas de la cuenca Neuquina teniendo encuenta el marco estratigráfico de los hallazgos, se presentan nuevos datos y semencionan aquellos aspectos aún no abordados. Los registros más antiguos hansido documentados en el Jurásico y contienen icnotaxones (Lapispira quehan sido descriptos por primera vez para Sudamérica en facies de plataforma.Otros constituyen un muy buen ejemplo de trazas bien preservadas en depósitosdeltaicos jurásicos de la Formación Lajas, con influencia mareal. Allí, elregistro incluye Asterosoma, Asteriacites, Dactyloidites, Diplocraterion,Gyrochorte, Palaeophycus, Polykladichnus, Schaubcilindrichnus, Siphonichnus,Thalassinoides, Teichichnus y trazas poco frecuentes en ambientes marinos someroscomo Helminthorhaphe y rizolitos, entre otras, indicativas de uncomplejo engranaje de facies. Los carbonatos jurásicos de la Formación La Manga contienen tempestitas con Dactyloidites, Gyrochorte, Jamerosonichnitesy Thalassinoides, en Bardas Blancas. El registro icnológico delCretácico Inferior se halla documentado en las Formaciones Mulichinco y Agrio.En la primera los icnofósiles aparecen en la zona de Vega de Escalone ycomprenden Asteriacites, Lockeia, Ophiomorpha, Gyrochorte y posiblementeBergaueria. En la Formación Agrio, tanto en Bajada del Agrio (localidadtipo como en otras localidades dispersas en la cuenca aparecen icnofósilestales como Gyrochorte, Ophiomorpha, Thalassinoides y Teichichnus.Nuevo material proveniente de ambas unidades incluye scratchs subácueos o dearrastre de vertebrados (Characichnos? provenientes de las localidadesde Vega de Escalone y Puerta Curaco. Las trazas de locomoción de artrópodosincluyen formas con apéndices diferenciados (Diplichnites? eindiferenciados. En la Formación Agrio se reconocieron huellas tridáctilas deterópodos en el anticlinal cerro Rayoso, que confirman exposición subaérea enuna zona hasta el

  17. El alga marina Sargassum (Sargassaceae: una alternativa tropical para la alimentación de ganado caprino

    Directory of Open Access Journals (Sweden)

    M Casas-Valdez

    2006-03-01

    Full Text Available Se estudió el valor nutricional de varias algas del género Sargassum. Veinte cabras hembras (Nubia en crecimiento (43 semanasse distribuyeron aleatoriamente en dos grupos de 10 cabras y se alojaron en corraletas individuales. Un grupo fue alimentado con una dieta testigo elaborada con insumos regionales y el otro con una dieta que incluyó el 25% de Sargassum spp. Durante 60 días se midieron diariamente y en forma individual, el alimento y agua consumidos, el peso corporal se cuantificó cada 15 días. La composición química proximal de Sargassum fue de: 89% materia seca, 7.7% proteína, 31% cenizas, 2% extracto etéreo y 39% de carbohidratos. También se determinaron las fracciones de fibra, minerales, vitaminas, ácidos grasos y factores antinutricios. No se encontraron diferencias significativas en el peso corporal (8.6 kg grupo control y 9 kg experimental, alimento consumido (1.31 kg grupo control y 1.6 experimentaly tasa de conversión alimenticia (11.1 grupo control y 12.6 experimental entre los tratamientos. El consumo de agua fue mayor en el grupo alimentado con la dieta que incluyó Sargassum spp (5.1 l. De los resultados se deduce que las algas marinas de este género pueden ser utilizadas como un forraje alternativo de mediana calidad para el ganado caprino.The seaweed Sargassum (Sargassaceae as tropical alternative for goats’ feeding. The nutritive value of seaweed (Sargassum spp. was studied in Baja California Sur, Mexico. Twenty female Nubian goats (43-weeks old were randomly distributed into two groups of 10 goats each and were housed in individual pens. One group was fed with a control diet and the other with a diet supplemented with 25% of Sargassum spp. Feed and water intake were recorded daily and individually for 60 days. The weight of each goat was recorded every 15 days. The nutritional content of Sargassum spp. was 89% dry mater, 8% crude protein, 31% ash, 2% ether extract, and 39% carbohydrates. Fiber fractions

  18. Screening of Salt-stress, Antioxidant Enzyme, and Antimicrobial Activity of Leave extracts of Mangroves Avicennia marina L. from Hodaidah, Yemen

    Directory of Open Access Journals (Sweden)

    Maher A. Al Maqtari

    2014-05-01

    Full Text Available In the present study the salinity stress, antioxidant enzyme and antimicrobial activities of leaf extract of Avicennia marinawere investigated. As visualized from SDS-PAGE, no differences was found in number of protein band, but the intensities of several protein bands having apparent molecular mass by reduced severely in salt treated samples with enhanced activities of CAT, POX and GPX. Escherichia coli (ATCC8739, Staphylococus aureus (ATCC 6538, and Bacillus subtilis (ATCC6633 and fungus (Candida albicans ATCC 2091, and Aspergillus niger ATCC 16404 were used as the test pathogenic bacteria and fungi, respectively in this study. The Avicennia marina extract possessed antibacterial activity against E. coli, S. aureus, and B. subtilis (12, 6, and 7 mm respectively, with antifungal activity against C. albicans and A. niger (9 and 10 mm.

  19. An approach to 3D modeling of marine platforms in operation; Un enfoque al modelado 3D de plataformas marinas en operacion

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Camargo, Octavio [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2007-07-01

    During the useful life of the marine platforms it is of great importance to have an intelligent three-dimensional model, that faithfully represents the facilities, in order to optimize the operative and maintenance procedures as well as to have a real information of the condition of the equipment and of each one of the components to facilitate the decision making, to make a risk analysis and dangerous operation analyses (HAZOP) and to make designs of improvements, modernization, substitutions and extensions. At the moment, the marine platforms are being designed with CAD tools, reason why before its installation they have a 3D model, which is updated as the design advances, until arriving at the approved version for construction. Later, the digital model of the marine platform serves to guide in the construction and follow up the advance of the same. Similarly, the model 3D is due to update with respect to the changes that arise during the construction and installation, until the commissioning of the platform, nevertheless, many of these were constructed when these tools were not yet available, reason why it becomes necessary to construct the digital model according to the present condition they exhibit. In order to develop the digital model of the marine platforms in operation, the activities are grouped in three large stages: specification of scope, retrieval of the information and modeling. [Spanish] Durante la vida util de las plataformas marinas es de gran importancia contar con un modelo tridimensional inteligente, que represente fielmente las instalaciones, con la finalidad de optimizar los procedimientos operativos y de mantenimiento asi como de disponer de informacion real del estado de los equipos y de cada uno de los componentes para facilitar la toma de decisiones, para hacer analisis de riesgos y analisis de operaciones peligrosas (HAZOP) y para hacer disenos de mejoras, modernizaciones, sustituciones y ampliaciones. Actualmente, las plataformas

  20. Co-ocurrencia de Chattonella marina y Gymnodinium catenatum en la Bahía de La Paz, Golfo de California (primavera 2009)

    OpenAIRE

    David Javier López-Cortés; Christine Johanna Band-Schmidt; Ismael Gárate-Lizárraga; José Jesús Bustillos-Guzmán; Francisco Eduardo Hernández-Sandoval; Erick Julian Núñez-Vázquez

    2011-01-01

    Durante el período del 24 de marzo al 14 de mayo de 2009 en la Bahía de La Paz, se obtuvieron muestras de agua y de red para análisis de fitoplancton. Una alícuota se fijó con una solución de Lugol para la identificación y cuantificación, la de red se utilizó para la identificación in vivo. Semanalmente se midió la temperatura in situ, se determinaron nutrientes inorgánicos y clorofila a en tres estaciones. Se identificaron dos especies: Chattonella marina (Subrahmanyan) Y. Hara et Chihara y ...

  1. Assessment of heavy metal and petroleum hydrocarbon contamination in the Sultanate of Oman with emphasis on harbours, marinas, terminals and ports.

    Science.gov (United States)

    Jupp, Barry P; Fowler, Scott W; Dobretsov, Sergey; van der Wiele, Henk; Al-Ghafri, Ahmed

    2017-08-15

    The assessment here includes data on levels of contaminants (petroleum hydrocarbons and heavy metals) in sediments and biomonitor organisms, including the eulittoral rock oyster Saccostrea cucullata and subtidal biomonitors, the barnacle Balanus trigonus and the antipatharian coral Antipathes sp., at harbours, marinas, terminals and large ports along the coastline of Oman. TBT levels in harbour and port sediments up to a maximum of 100ppb TBT dry weight are highlighted. Oysters contained concentrations up to 367ppm mg TPH/kg dry weight. The maximum levels of Cd, Cu, Pb and Zn were found in the subtidal sediments and barnacles at the oil tanker loading Single Buoy Mooring stations in Mina Al Fahal. In general, the levels of most of the contaminants analysed are at low to moderate concentrations compared to those in highly contaminated sites such as shipyards and dry docks, but continued monitoring is recommended especially during any dredging campaigns. Copyright © 2017 Elsevier Ltd. All rights reserved.

  2. Marinas e náutica no litoral brasileiro: aportes metodológicos introdutórios para a pesquisa e o planejamento territorial do turismo.

    Directory of Open Access Journals (Sweden)

    Daniel Hauer Queiroz Telles

    2013-01-01

    Full Text Available In this article it is analyzed the concept of territory from non-exclusive conceptions with the intention to understand the marines along the coast of Brazil. The aim is to contribute to the generation of scientific and technological knowledge on the subject, presenting a definition, a classification and a genesis, as well as, highlighting its social relevance. It presents a summarized literature review on the matter and stipulates the cross-scale perspective supported by the approaches that analyze the phenomenon in question. The approaches are based on the productive dimension and the identification of the urban environment; show the importance and necessity of new proposals on the subject matter. Classification and genesis of marinas in Brazil are presented in stages, it is emphasized the importance of tourism in territorial planning to act and narrow the gaps between knowledge and politics; whereas the nautical sector is no subject of discussion in the coastal zone of Brazil.

  3. Remote Sensing of Shallow Coastal Benthic Substrates: In situ Spectra and Mapping of Eelgrass (Zostera marina in the Gulf Islands National Park Reserve of Canada

    Directory of Open Access Journals (Sweden)

    Tara Sharma

    2011-05-01

    Full Text Available Eelgrass (Zostera marina is a keystone component of inter- and sub-tidal ecosystems. However, anthropogenic pressures have caused its populations to decline worldwide. Delineation and continuous monitoring of eelgrass distribution is an integral part of understanding these pressures and providing effective coastal ecosystem management. A proposed tool for such spatial monitoring is remote imagery, which can cost- and time-effectively cover large and inaccessible areas frequently. However, to effectively apply this technology, an understanding is required of the spectral behavior of eelgrass and its associated substrates. In this study, in situ hyperspectral measurements were used to define key spectral variables that provide the greatest spectral separation between Z. marina and associated submerged substrates. For eelgrass classification of an in situ above water reflectance dataset, the selected variables were: slope 500–530 nm, first derivatives (R’ at 566 nm, 580 nm, and 602 nm, yielding 98% overall accuracy. When the in situ reflectance dataset was water-corrected, the selected variables were: 566:600 and 566:710, yielding 97% overall accuracy. The depth constraint for eelgrass identification with the field spectrometer was 5.0 to 6.0 m on average, with a range of 3.0 to 15.0 m depending on the characteristics of the water column. A case study involving benthic classification of hyperspectral airborne imagery showed the major advantage of the variable selection was meeting the sample size requirements of the more statistically complex Maximum Likelihood classifier. Results of this classifier yielded eelgrass classification accuracy of over 85%. The depth limit of eelgrass spectral detection for the AISA sensor was 5.5 m.

  4. Valoración económica del buceo como estrategia de uso sostenible de la biodiversidad marina, Archipielago de San Andres y Providencia, Caribe Colombiano.

    Directory of Open Access Journals (Sweden)

    James Cruz. Johannie L.

    2011-11-01

    Full Text Available El buceo es un uso alternativo y no consuntivo de la biodiversidad marina que, debidamente practicado, tiene bajo impacto ambiental, estimula la conservación de los arrecifes y es una opción económica para habitantes de áreas arrecifales o con potencial para el buceo. El archipiélago de San Andrés, Providencia y Santa Catalina, declarado por UNESCO Reserva Mundial de la Biosfera Seafl ower, con 65.000 km2 de Áreas Marinas Protegidas y un extenso complejo arrecifal coralino, tiene condiciones para convertirse en un sitio de buceo de nivel mundial. Sin embargo, es poco conocido. Esta investigación analiza el potencial económico del buceo en esta región y lo compara con el de sitios muy reconocidos como Bonaire y Gran Caimán. Mediante análisis de la disponibilidad a pagar de buzos visitantes, se intenta valorar el buceo y se caracteriza el tipo de buzos que vienen al archipiélago. Se encontró disposición a pagar cifras superiores a las que se paga actualmente en otras partes del Caribe. Con un potencial estimado en $241 millones de dólares de ingresos anuales, el buceo es una interesante alternativa de desarrollo económico sostenible para estas islas que, a pesar de recibir 360.000 turistas al año, aún presentan un 66.9% de pobreza y altos niveles de desempleo.

  5. Study of protective effect of Avicennia marina hydroethanolic leaf extract on testes tissue and spermatogenesis in male rat induced with carbon tetrachloride

    Directory of Open Access Journals (Sweden)

    Z soleimani

    2015-11-01

    Full Text Available Aim: The toxic chemical compounds are widelyused in the world. Carbon tetrachloride which is used in hygiene industries caused tissue disorders. Medicinal plants have protective effects in body tissues. In this study the protective effect of Avicennia marina leaf extract (MLE on spermatogenesis in male rat were induced with ccl4 investigating. Method and materials: The 42 male rats with 220-250 gr body weight were divided randomly in 6 groups(n=7: control (taking normal saline,0.5ml/day, i,p , sham(taking olive oil, 0.5ml/day, i,p single dose,group induced by ccl4(carbon tetrachloride 1:1 with olive oil,0.5ml single dose, i,p, treated groups: (1,2 and3 by carbon tetrachloride 1:1 with olive oil,0.5ml single dose and 200mg/Kg, 400mg/Kg and 800mg/kg MLE /day for 96 hrs, i,p. After the examination the blood samples were collected from heart directly and testosterone , FSH, LH , sperm count, sperm motility and GSI were analyzed and the microscopic studies of testes tissue were done. All data were expressed as mean±SEM. and statistical significance differences were accepted at P<0.05. Results: Our results showed that the carbon tetrachloride has necrotic effect in testes. The number of sperm and motility were increased and microscopic study of testes tissue showed the necrosis and inflammation with decrease in spermatogonia and spermatocytes comparedwith ccl4 induced only group significantly (P<0.001 and treated groups were no changed. Conclusion: the Avicennia marina hydroethanolic extract has antioxidant and flavonoids compounds which can protect the testes tissues from toxic chemical agents.

  6. Estudio de macronutrientes para la producción de PUFAs a partir de la microalga marina Isochrysis galbana

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    García Sánchez, J. L.

    1994-10-01

    Full Text Available Marine microalgae are presented as alternative sources for polyunsaturated fatty acids production.
    A macronutrient optimization method for culture media commonly used for Isochrysis galbana growth is discussed. This microalga has been reported as a good RUFA producer.
    The optimization was conducted applying the response surface technique, parameters tested being nitrate, phosphate, ferric citrate and manganese chloride concentrations and the suplementary CO2 in the bubbling air.
    The results show the evidence of growth limitation with the initial culture media and it is proposed a second optimization step considering as design variables the different ratios between media components.

    Las microalgas marinas se presentan como una fuente altemativa en la producción de ácidos grasos poliinsaturados (PUFAs, frente a las fuentes convencionales, como son los aceites de pescado.
    En este trabajo se presenta un estudio de macronutrientes para el medio de cultivo utilizado en el crecimiento de la microalga marina Isochrysis galbana, empleada con este objetivo.
    La metodología de optimización aplicada ha sido la técnica de superficie de respuesta, siendo los factores estudiados el porcentaje de CO2 suplementario en la corriente de burbujeo, y las concentraciones de nitratos, fosfatos, citrato férrico y cloruro de manganeso en el medio de cultivo. Los resultados de este trabajo ponen de manifiesto la existencia de limitaciones al crecimiento con el medio de partida y orientan a una segunda etapa de optimización, tomando como variables de diseño las relaciones entre los distintos componentes del medio de cultivo.

  7. Relevance of Nitrospira for nitrite oxidation in a marine recirculation aquaculture system and physiological features of a Nitrospira marina-like isolate.

    Science.gov (United States)

    Keuter, Sabine; Kruse, Myriam; Lipski, André; Spieck, Eva

    2011-09-01

    In biofilters of recirculation aquaculture systems (RAS), nitrification by lithoautotrophic microorganisms is essential to prevent the cultivated organisms from intoxication with ammonium and nitrite. In moving-bed biofilters nitrifying microorganisms are immobilized together with heterotrophic bacteria in dense biofilms on carrier elements like plastic beads. Analyses of fatty acid profiles of these biofilms from a marine biofilter revealed a high abundance of Nitrospira-related lipid markers (8-12% of total fatty acids). Further results of a labeling experiment with (13) C-bicarbonate in mineral salts medium with 3 mM nitrite confirmed that Nitrospira is the major autotrophic nitrite oxidizer in the biofilter system. According to 16S rRNA gene sequence analyses the nitrite-oxidizing community in the biofilter consisted of at least two different representatives of Nitrospira, one of which could be successfully isolated. The marine isolate 'Ecomares 2.1' belongs to cluster IVa and showed 98.8% 16S rRNA gene sequence similarity to Nitrospira marina, whereas the enrichment 'M1 marine' is only distantly related (94.0% 16S rRNA gene sequence similarity to N. marina). In laboratory experiments, the isolate exhibited remarkable tolerances against high substrate and product concentrations (30 mM nitrite and 80 mM nitrate) as well as ammonium (50 mM). During the isolation process a strong tendency of this strain to develop biofilms became apparent. Thus, Ecomares 2.1 seems to be well adapted to the attached lifestyle in biofilters and the nitrogenous load prevailing in the effluent waters of RAS. Both members of Nitrospira could be detected by PCR-based methods in environmental samples of marine and brackish RAS biofilters and are therefore considered to be characteristic for these engineered ecosystems.

  8. The concept of population in clonal organisms: mosaics of temporally colonized patches are forming highly diverse meadows of Zostera marina in Brittany.

    Science.gov (United States)

    Becheler, R; Diekmann, O; Hily, C; Moalic, Y; Arnaud-Haond, S

    2010-06-01

    Seagrasses structure some of the world's key coastal ecosystems presently in decline due to human activities and global change. The ability to cope with environmental changes and the possibilities for shifts in distribution range depend largely on their evolvability and dispersal potential. As large-scale data usually show strong genetic structure for seagrasses, finer-grained work is needed to understand the local processes of dispersal, recruitment and colonization that could explain the apparent lack of exchange across large distances. We aimed to assess the fine-grained genetic structure of one of the most important and widely distributed seagrasses, Zostera marina, from seven meadows in Brittany, France. Both classic population genetics and network analysis confirmed a pattern of spatial segregation of polymorphism at both regional and local scales. One location exhibiting exclusively the variety 'angustifolia' did not appear more differentiated than the others, but instead showed a central position in the network analysis, confirming the status of this variety as an ecotype. This phenotypic diversity and the high allelic richness at nine microsatellites (2.33-9.67 alleles/locus) compared to levels previously reported across the distribution range, points to Brittany as a centre of diversity for Z. marina at both genetic and phenotypic levels. Despite dispersal potential of several 100 m, a significant pattern of genetic differentiation, even at fine-grained scale, revealed 'genetic patchiness'. Meadows seem to be composed of a mosaic of clones with distinct origins in space and time, a result that calls into question the accuracy of the concept of populations for such partially clonal species.

  9. Caracterización toxicológica de las macroalgas marinas Hypnea spp y Sargasun spp para la futura utilización en la alimentación y la salud animal como humana

    Directory of Open Access Journals (Sweden)

    Vladimir Barrios González

    2007-07-01

    Full Text Available El estudio y la investigación creciente en la industria alimenticia, farmacológica así como en la cosmeticología ha provocado que se analicen variantes novedosas como las macroalgas marinas. La moderna agricultura como ciencia, además del cultivo y explotación racional de los peces, crustáceos y moluscos, contempla una importante área de investigación y desarrollo como lo son las macroalgas marinas. Las algas constituyen el primer eslabón de la cadena trófica que más eficientemente aprovecha la energía radiante, la transforma y almacena en forma de energía molecular y la pone a disposición de los otros niveles tróficos de los ecosistemas marinos. En países desarrollados se han efectuado intentos de la utilización de macroalgas marinas para la alimentación suplementaria animal aunque en la actualidad no existen investigaciones publicadas sobre dicha práctica en países subtropicales y tropicales como Cuba, país de grandes extensiones costeras, con una flora rica, variada, exuberante y típicamente caribeña, no se ha explotado suficientemente este importante recurso natural, Barrios (2002. Los estudios Toxicológico realizados por el Centro Nacional de Sanidad Agropecuaria de Cuba CENSA y el Grupo de Investigaciones Novedosas y de Impacto (GINI de la Universidad de Matanzas Camilo Cienfuegos realizados a las macroalgas marinas dargassum spp e Hypnea Spp, demostraron la inocuidad de las mismas por lo que se considera desde el punto de vista toxicológico un candidato seguro y fiable para la Industria alimenticia, la cosmeticología y la farmacología ya sea animal como humana.

  10. La línea de biología marina, del posgrado en ciencias, biología de la universidad nacional de colombia: 1979-2009, 30 años de actividad

    OpenAIRE

    Campos C., Néstor Hernando; Acero P, Arturo; Zea, Sven

    2012-01-01

    La Universidad Nacional de Colombia tiene como uno de sus objetivos el formar y preparar investigadores altamente calificados en las diferentes ramas de las ciencias incluyendo aquellas que se relacionan con el conocimiento y el aprovechamiento de los recursos naturales. Teniendo en cuenta las facilidades en infraestructura y demás que brinda el Instituto de Investigaciones Marinas y Costeras – INVEMAR, la Universidad Nacional desarrolla en Santa Marta desde 1979 un programa de formación a ni...

  11. Miniaturización y simplificación de pruebas bioquímicas para la identificación de bacterias marinas asociadas al camarón

    OpenAIRE

    Solis Paredes, A.

    1996-01-01

    Miniaturización y simplificación de pruebas bioquímicas para la identificación de bacterias marinas asociadas al camarón A partir de una revisión sobre las bacterias que se han descrito asociadas al camarón se seleccionó un grupo de criterios bioquímicos que permiten su identificación de forma específica.

  12. Fichas de especies representativas de las Áreas Marinas Costeras Protegidas de Múltiples Usos de Chile. Documento de apoyo a guía docente AMCP-MU. Proyecto GEF MARINO.

    OpenAIRE

    Urra Parra, Helen; Vliegenthart, Ana María; Basterrechea, Valentina; Donoso, Magdalena; Quezada, Monserrat

    2007-01-01

    Este documento contiene una descripción de las especies más representativas de las Áreas Marinas Costeras Protegidas de Múltiples Usos de Chile.En el marco de este trabajo,se construyó una ficha donde se incluyen campos como : Nombre común de la especie,nombre científico,distribución,descripción física,biología,estado de conservación,entre otras.

  13. Human-induced hydrological changes and sinkholes in the gypsum karst of Lesina Marina area (Foggia Province, Italy)

    Science.gov (United States)

    Fidelibus, M. D.; Gutierrez, F.; Spilotro, G.

    2009-04-01

    the piezometric level and the associated bidirectional changes of the groundwater flow in the vicinity of the canal play a relevant role in the internal erosion processes. The low cohesion of the sandy cover determines to a great extent the high speed at which suffosion processes and the generation-enlargement of sinkholes are taking place. Subsidence activity has affected the canal since its construction. To our knowledge, the first account of a sinkhole occurrence in the adjacent area corresponds to an official report dating back to 1990. The great majority of the sinkholes are located within the canal and on two relatively narrow bands situated on its flanks. The sinkholes tend to form clusters and alignments with a prevalent N145E orientation. The Lesina Marina residential area, whose construction in the western side of the canal started around 1980, is currently suffering from subsidence damage, including the occurrence of collapse sinkholes in streets, destruction of pathways and cracking of walls. Boreholes and geophysical surveys performed in the area reveal the presence of abundant cavities up to 9 m in height, cave fills and collapse breccias in the strongly karstified bedrock. Most of the depressions can be classified as cover suffosion and collapse sinkholes generated by the downward migration of the loose sandy cover through voids in the bedrock. The lack of basal support caused by piping may lead to the gradual settlement of the cover and/or its collapse through the development of failure planes. These sinkholes are typically less than 1 m across and 2-3 m deep at the initial stages. However, they typically grow very rapidly by mass wasting processes acting on their edges until they reach the repose angle of the detrital mantle. Consequently, clusters of small sinkholes tend to evolve into a smaller number of large depressions up to 20 m meters across resulting from the coalescence of several dolines. Some sinkholes are related to the breakdown of

  14. Algas marinas bentónicas de la costa noroccidental de Guerrero, México Benthic marine algae of the west coast of Guerrero, Mexico

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    Luz Elena Mateo-Cid

    2012-12-01

    Full Text Available Se presentan los resultados de un estudio sobre algas marinas bentónicas en 7 localidades de la costa noroccidental de Guerrero, México. Se determinó la presencia de 163 especies de algas marinas. Se identificaron 17 especies de Cyanobacteria, 93 Rhodophyta, 28 Chlorophyta y 25 de Heterokontophyta. Se citan 54 registros nuevos para el litoral de Guerrero, 2 también nuevos, Myrionema strangulans Greville y Acrochaete ramosa (N.L.Gardner O'Kelly para la costa del Pacífico. Cada especie se acompaña de datos sobre su distribución en el área de estudio, su estado reproductivo, nivel de marea, hábitat, observaciones, epifitismo y número de herbario o de recolección. Se comparó la riqueza específica entre la estación climática de lluvias y la de secas. La división Rhodophyta dominó en términos de diversidad en relación con las 3 divisiones restantes. La ficoflora de la costa noroccidental de Guerrero es de afinidad tropical y más diversa en la época de secas.We present results on the study on benthic marine algae in 7 localities from the west coast of Guerrero, Mexico. We report 163 species: 17 Cyanobacteria, 93 Rhodophyta, 28 Chlorophyta and 25 Heterokontophyta. Fifty four are new records for Guerrero; while Myrionema strangulans Greville and Acrochaete ramosa (N.L.Gardner O'Kelly are new to the Pacific coast of Mexico. Each species includes data on its distribution, reproductive stages, tidal level, facies, epiphytism and herbarium's number. Species diversity was compared for 2 different climatic seasons. The Rhodophyta are dominant in terms of diversity in relation to the other groups. The algal flora of the northwest coast of Guerrero is tropical and the greatest diversity was found during dry seasons.

  15. Análisis multicriterio del impacto potencial del turismo en la anidación de las tortugas marinas en Chalacatepec, Jalisco

    Directory of Open Access Journals (Sweden)

    Y. Flores-Monter

    2015-01-01

    Full Text Available Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV, un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a Preparación y construcción y b Operación y mantenimiento, como una herramienta de ayuda a la toma de decisiones en la conservación de las especies Lepidochelys olivácea (tortuga golfina, Chelonia agassizii (tortuga prieta y Dermochelys coriácea (tortuga laúd. Método: Se calculó la densidad de anidación (nidos por kilómetro y se utilizó el método de evaluación multicriterio (EMC discreto Proceso Analítico Jerárquico (PAJ, para estimar el impacto de 8 amenazas turísticas: desmonte y despalme, excavaciones, rellenos, contaminación sonora, residuos sólidos, presencia de personal de obra y construcciones provisionales, iluminación artificial del frente de playa y concentración de visitantes. Se construyó una matriz de comparación, se asignó un peso a cada amenaza, y mediante el uso de un SIG se generaron los mapas de impacto potencial del turismo. Resultados: Las amenazas con mayor peso o ponderación (eigenvector total fueron los rellenos (0.36482 y la concentración de visitantes (0.38194. La construcción y operación turística puede afectar el 59.8% de las anidaciones e impactar principalmente en la costa sur el km 1 (1 142 registros de nidos colectados y, en la costa norte el km 1 (329 nidos, km 3 (311 nidos, km 4 (268 nidos y km 5 (151 nidos. Discusión o Conclusión: La playa de anidación en Chalacatepec es de gran importancia para la protección y conservación de las tortugas marinas. La presente EMC fue una herramienta adecuada para estimar las consecuencias del

  16. Ecological Responses of Avicennia marina to Key En-vironmental Factors:A Review%白骨壤对关键环境因子的生态响应研究进展

    Institute of Scientific and Technical Information of China (English)

    黄灵玉; 胡宝清; 范航清

    2014-01-01

    Avicennia marina is a pioneer mangrove plant with a wide geographical and cli-matic distribution across the intertidal region where conditions are usually harsh,restrictive and dynamic.To cope with the impacts of intertidal environment,A.marina has developed a set of adaptation mechanisms in the terms of morphology,moisture content,photosynthesis, transpiration,stomatal conductance,biomass and growth etc.For the purpose of promoting the protection and restoration of mangrove ecosystem,ecological responses of A.marina to temperature,salinity,soil properties,tidal waterlogging and water strength,etc,were re-viewed in this paper.As a pioneer and indigenous mangrove plant,A.marina is highly toler-ant and capable of protecting ecological security.Thus further studies should be conducted on the ecological response mechanism between A.marina and environmental factors.%白骨壤(Avicenniamarina )是红树林生态系统的先锋植物。为适应低温、高盐、淹水、土壤缺氧和潮水冲击等诸多不良因子的影响,白骨壤已特化出一套适应机制:包括形态结构、水分、光合作用、蒸腾作用、气孔导度、生物量和生长等。本文综述了白骨壤对低温、盐度、土壤、潮水浸淹、风浪作用等环境因子的生态响应,指出白骨壤作为先锋树种和乡土树种,对环境具有较强的耐受性和适应性并能有效保护生态安全,可作为红树林造林优先选择的树种,应深入研究其与各环境因子的生态响应机制,为红树林造林地选择及生态修复提供科学依据。

  17. Co-ocurrencia de Chattonella marina y Gymnodinium catenatum en la Bahía de La Paz, Golfo de California (primavera 2009) Co-ocurrence of Chattonella marina and Gymnodinium catenatum in Bahía de La Paz, Gulf of California (Spring 2009)

    OpenAIRE

    David Javier López-Cortés; Christine Johanna Band-Schmidt; Ismael Gárate-Lizárraga; José Jesús Bustillos-Guzmán; Francisco Eduardo Hernández-Sandoval; Erick Julian Núñez-Vázquez

    2011-01-01

    Durante el período del 24 de marzo al 14 de mayo de 2009 en la Bahía de La Paz, se obtuvieron muestras de agua y de red para análisis de fitoplancton. Una alícuota se fijó con una solución de Lugol para la identificación y cuantificación, la de red se utilizó para la identificación in vivo. Semanalmente se midió la temperatura in situ, se determinaron nutrientes inorgánicos y clorofila a en tres estaciones. Se identificaron dos especies: Chattonella marina (Subrahmanyan) Y. Hara et Chihara y ...

  18. Uso de indicadores de Presión-Estado-Respuesta en el diagnóstico de la comarca de la Marina Baixa, SE, España

    Directory of Open Access Journals (Sweden)

    E. Chirino

    2008-01-01

    Full Text Available En las últimas décadas, la comarca Marina Baixa ha sido objeto de una significativa transformación socioeconómica; lo cual ha diferenciado cambios demográficos, cambios en los usos del suelo y, en consecuencia, cambios en los usos y demanda de agua. Esta transformación ha generado 3 unidades ambientales de referencia (interior, intermedia y litoral. En este contexto, y a partir del marco de referencia Presión- Estado-Respuesta (PER, se han utilizado un conjunto de indicadores con el objetivo de contribuir al diagnóstico e identificación de problemas en el territorio. Los resultados indican un déficit hídrico anual, elevado crecimiento urbanístico y turístico, y alta densidad demográfica en el litoral y zona intermedia; lo que unido al crecimiento de la agricultura intensiva de regadío genera un balance hídrico negativo a escala de unidades ambientales. A nivel comarcal, el actual modelo de desarrollo es ecológicamente insostenible.

  19. Vitamin A values of wild-caught Cuban tree frogs (Osteopilus septentrionalis) and marine toads (Rhinella marina) in whole body, liver, and serum.

    Science.gov (United States)

    Sullivan, Kathleen E; Fleming, Greg; Terrell, Scott; Smith, Dustin; Ridgley, Frank; Valdes, Eduardo V

    2014-12-01

    Recent issues surrounding captive amphibians are often nutritionally related problems, such as hypovitaminosis A. Although supplementation of frogs with vitamin A is a topic of investigation, the underlying issue is understanding vitamin A metabolism in amphibian species. To develop a range of "normal" vitamin A concentrations for captive amphibians, baseline vitamin A concentrations must be established in wild amphibian species. In this study, two species, Cuban tree frogs (Osteopilus septentrionalis; n = 59) and marine toads (Rhinella marina; n = 20) were collected from the wild as part of an invasive species control program at Zoo Miami, Miami, Florida. Serum, liver, and whole body samples were analyzed for vitamin A content. The Cuban tree frogs showed higher concentrations on average of vitamin A in serum (82.8 ppb), liver (248.3 IU/g), and whole body (5474.7 IU/kg) samples compared with marine toads (60.1 ppb; 105.3 IU/g; 940.7 IU/kg, respectively), but differences were not significant (P = 0.22). What can be considered "normal" values of vitamin A concentrations across different amphibian species requires further investigation. Although all amphibians collected in this study appeared healthy, a larger sample size of animals, with known health histories and diets, may provide stronger evidence of normal expectations.

  20. Mortandad de aves marinas durante "El Niño 1997-98" en el litoral sur de San Juan de Marcona, Ica -Perú

    Directory of Open Access Journals (Sweden)

    Manuel Apaza

    2014-06-01

    Full Text Available Entre agosto de 1997 y abril de 1998, se evaluó, al sur de la punta guanera de San Juan de Marcona, la mortandad de las poblaciones de aves marinas. Especies de alimentación exclusivamente pelágica y de distribución restringida al ámbito de la Corriente Peruana, como las aves guaneras Pelecanus thagus, Sula variegata y Phalacrocorax bougainvillii, el pingüino Spheniscus humboldti y el zarcillo Larosterna inca, mostraron una correlación significativa en el comportamiento mensual, relacionados con la temperatura superficial del mar y con la ausencia del recurso anchoveta Engraulis ringens durante el evento "El Niño". Otras especies consideradas en el análisis presentaron una mortandad diferente, como la gaviota de Franklin Larus pipixcan y la gaviota gris Larus modestus, en ambos casos, las especies se alimentaron de recursos alternativos, como Calosoma sp. y Emeríta analoga, respectivamente.

  1. Avicequinone C Isolated from Avicennia marina Exhibits 5α-Reductase-Type 1 Inhibitory Activity Using an Androgenic Alopecia Relevant Cell-Based Assay System

    Directory of Open Access Journals (Sweden)

    Ruchy Jain

    2014-05-01

    Full Text Available Avicennia marina (AM exhibits various biological activities and has been traditionally used in Egypt to cure skin diseases. In this study, the methanolic heartwood extract of AM was evaluated for inhibitory activity against 5α-reductase (5α-R [E.C.1.3.99.5], the enzyme responsible for the over-production of 5α-dihydrotestosterone (5α-DHT causing androgenic alopecia (AGA. An AGA-relevant cell-based assay was developed using human hair dermal papilla cells (HHDPCs, the main regulator of hair growth and the only cells within the hair follicle that are the direct site of 5α-DHT action, combined with a non-radioactive thin layer chromatography (TLC detection technique. The results revealed that AM is a potent 5α-R type 1 (5α-R1 inhibitor, reducing the 5α-DHT production by 52% at the final concentration of 10 µg/mL. Activity-guided fractionation has led to the identification of avicequinone C, a furanonaphthaquinone, as a 5α-R1 inhibitor with an IC50 of 9.94 ± 0.33 µg/mL or 38.8 ± 1.29 µM. This paper is the first to report anti-androgenic activity through 5α-R1 inhibition of AM and avicequinone C.

  2. Corrientes posmodernas vistas desde América Latina. La arquitectura “latinoamericana” en la crítica arquitectónica de Marina Waisman

    Directory of Open Access Journals (Sweden)

    María Rosa Zambrano Torres

    2015-12-01

    Full Text Available Este trabajo se centra en diversos artículos publicados en la década de 1980 y 1990 por la teórica argentina Marina Waisman, uno de los rostros más influyentes de la crítica arquitectónica en América Latina de la segunda mitad del siglo XX. Se reconstruyen algunas lecturas críticas sobre “arquitectura latinoamericana” que publicó en diversos medios iberoamericanos, en los que reivindicó la existencia de una “latinoamericanidad” en arquitectura y estableció, con ello, un interesante diálogo entre la noción de “identidad” y el debate contemporáneo sobre “regionalismo crítico”, liderado por Kenneth Frampton en la década de 1980. Una mirada a los debates generados en torno a la transición de la arquitectura moderna hacia la postmodernidad, de la manera que fueron vistos por esta autora desde Latinoamérica, y que, gracias a la intensa carrera académica y editorial que mantuvo, contaron con un alto grado de difusión a nivel iberoamericano.

  3. Daily production and consumption in an eelgrass (Zostera marina) community in saline Lake Grevelingen: discrepancies between the O/sub 2/ and /sup 14/C method

    Energy Technology Data Exchange (ETDEWEB)

    Lindeboom, H.J.; de Bree, B.H.H. (Delta Institute for Hydrobiological Research, Yerseke (Netherlands))

    1982-12-01

    During seven 28-hour measurement periods in 1980 and 1981 the oxygen production and consumption in an eelgrass community in Lake Grevelingen (Netherlands) were determined using light and dark plexiglass enclosures. Applying an oxygen to carbon conversion factor of 0.29 the amount of carbon fixed and the amount of organic carbon consumed were estimated. During the daylight period a net production was found, whereas over 24 hours a net production in spring and a net consumption later in the year were found. On an annual basis, production and consumption were approximately equal, with a net production occurring in the over-ground eelgrass community and a net consumption in the sediment. Close to the plexiglass enclosures samples were taken in order to measure primary production with the /sup 14/C method. Comparison of the results of the O/sub 2/ and /sup 14/C methods showed that the first yielded considerably higher C fixation values (1.2 to 2.0 times for the production of Zostera marina and 2.7 to 5.4 times for that of the microphytobenthos). Production values assessed with the /sup 14/C method in comparison with the consumption values assessed with the O/sub 2/ method were always much too low, and a carbon mass balance based on the two methods fails.

  4. Lista de esponjas marinas asociadas al arrecife Tuxpan, Veracruz, México Checklist of marine sponges from Tuxpan Reef, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Carlos González-Gándara

    2009-04-01

    Full Text Available Se presenta la lista de esponjas marinas (Porifera: Demospongiae del arrecife Tuxpan, Veracruz, México, colectadas en 2004, 2005 y 2006 mediante buceo libre y con equipo autónomo SCUBA. Los resultados muestran la presencia de 18 especies pertenecientes a 13 géneros y 13 familias, 17 de estas especies son nuevos registros para los arrecifes coralinos del norte de Veracruz y una (Aplysina cauliformis Carter, 1882 para el estado. La información puede auxiliar para definir las estrategias de manejo, monitoreo y protección de estas formaciones arrecifales que recientemente han sido propuestas como área de protección de flora y fauna.A checklist of marine sponge species (Porifera: Demospongiae from Tuxpan reef, Veracruz, Mexico, collected during 2004, 2005 and 2006 by free and SCUBA diving equipment, is presented. The results show the presence of 18 species belonging to 13 genera and 13 families. 17 speices represent new records for the northern coral reefs of Veracruz, and the 18th species (Aplysina cauliformis Carter, 1882 is a new record for the state. This information may help to define appropriate management, monitoring and protection strategies for the coral reefs of the north of Veracruz, which have been proposed as a natural preserve area recently.

  5. Pollutant tracking for 3 Western North Atlantic sea grasses by remote sensing: Preliminary diminishing white light responses of Thalassia testudinum, Halodule wrightii, and Zostera marina.

    Science.gov (United States)

    Thorhaug, Anitra; Berlyn, Graeme P; Poulos, Helen M; Goodale, Uromi M

    2015-08-15

    Sea grasses are foundation species for estuarine ecosystems. The available light for sea grasses diminishes rapidly during pollutant spills, effluent releases, disturbances such as intense riverine input, and tidal changes. We studied how sea grasses' remote-sensing signatures and light-capturing ability respond to short term light alterations. In vivo responses were measured over the entire visible-light spectra to diminishing white-light on whole-living-plants' spectral reflectance, including 6h of full oceanic-light fluences from 10% to 100%. We analyzed differences by various reflectance indices. We compared the sea grasses species responses of tropical vs. temperate and intertidals (Halodule wrightii, and Zostera marina) vs. subtidal (Thalassia testudinum). Reflectance diminished with decreasing light intensity that coincided with greater accessory pigment stimulation (anthocyanin, carotenoids, xanthins). Chlorophyll a and Chlorophyll b differed significantly among species (Thalassia vs. Halodule). Photosynthetic efficiency diminished at high light intensities. The NDVI index was inadequate to perceive these differences. Our results demonstrate the leaf-level utility of data to remote sensing for mapping sea grass and sea grass stress.

  6. Development and application of long-term sublethal whole sediment tests with Arenicola marina and Corophium volutator using Ivermectin as the test compound

    Energy Technology Data Exchange (ETDEWEB)

    Allen, Yvonne T. [Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex, CM0 8HA (United Kingdom)]. E-mail: yvonne.allen@cefas.co.uk; Thain, John E. [Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex, CM0 8HA (United Kingdom); Haworth, Sarah [Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex, CM0 8HA (United Kingdom); Barry, Jon [Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex, CM0 8HA (United Kingdom)

    2007-03-15

    Short-term whole sediment tests using the amphipod Corophium volutator and the polychaete Arenicola marina are now routinely used in Europe to assess the acute toxicity of marine sediments. However, there is still a need to develop longer-term assays which measure effects on sublethal endpoints that are more relevant to predicting impacts at the population level. The effect of increasing exposure times and measuring additional endpoints such as growth, on the sensitivity of these assays was investigated. The test compound used was the chemotherapeutant Ivermectin (IVM), used in aquaculture to treat sea lice infestations. IVM was found to be acutely toxic to both test organisms. Extending the lugworm test to 100 days increased sensitivity of survival by a factor of three; a significant reduction in casting rate was observed at concentrations an order of magnitude lower. This assay shows potential for detecting the sublethal effects of low concentrations of sediment contaminants. Increasing the exposure time did not seem to affect the sensitivity of the amphipod, but further method development is required. - Long-term sublethal sediment tests are more sensitive than standard acute tests when assessing the toxic effects of Ivermectin.

  7. Development and application of long-term sublethal whole sediment tests with Arenicola marina and Corophium volutator using Ivermectin as the test compound.

    Science.gov (United States)

    Allen, Yvonne T; Thain, John E; Haworth, Sarah; Barry, Jon

    2007-03-01

    Short-term whole sediment tests using the amphipod Corophium volutator and the polychaete Arenicola marina are now routinely used in Europe to assess the acute toxicity of marine sediments. However, there is still a need to develop longer-term assays which measure effects on sublethal endpoints that are more relevant to predicting impacts at the population level. The effect of increasing exposure times and measuring additional endpoints such as growth, on the sensitivity of these assays was investigated. The test compound used was the chemotherapeutant Ivermectin (IVM), used in aquaculture to treat sea lice infestations. IVM was found to be acutely toxic to both test organisms. Extending the lugworm test to 100 days increased sensitivity of survival by a factor of three; a significant reduction in casting rate was observed at concentrations an order of magnitude lower. This assay shows potential for detecting the sublethal effects of low concentrations of sediment contaminants. Increasing the exposure time did not seem to affect the sensitivity of the amphipod, but further method development is required.

  8. ‘A Timeless Grammar of Iconoclasm?’: Kristine Kolrud and Marina Prusac (eds, Iconoclasm From Antiquity to Modernity, Farnham: Ashgate, 2014

    Directory of Open Access Journals (Sweden)

    Lauren Dudley

    2014-12-01

    Full Text Available This review examines Kristine Kolrud and Marina Prusac’s edited volume, Iconoclasm From Antiquity to Modernity. The collection of essays covers a broad historical and methodological scope and explores the motives and discourses related to iconoclastic acts, including written sources about iconoclasts and iconophiles. It also considers terminology associated with iconoclastic acts and, through its consideration of modern case studies, proffers various categories of intention. The examples discussed by each contributor raise questions relating to the methods of destruction as well as written accounts about acts of iconoclasm but, overall, the theoretical structure of the volume might be regarded as lacking the critical acumen evident by Bruno Latour and Peter Weibel in their larger scale Iconoclash catalogue. Nevertheless, this volume’s contributors explore themes such as memory and power struggles, while also addressing the reliability of material and written sources. This review provides an analysis of each chapter and how they relate to the overall volume and, indeed, existing scholarship on iconoclasm.

  9. Accumulation of Trace Metal Elements (Cu, Zn, Cd, and Pb in Surface Sediment via Decomposed Seagrass Leaves: A Mesocosm Experiment Using Zostera marina L.

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    Shinya Hosokawa

    Full Text Available Accumulation of Cu, Zn, Cd, and Pb in the sediment of seagrass ecosystems was examined using mesocosm experiments containing Zostera marina (eelgrass and reference pools. Lead was approximately 20-fold higher in the surface sediment in the eelgrass pool than in eelgrass leaves and epiphytes on the eelgrass leaves, whereas zinc and cadmium were significantly lower in the surface sediment than in the leaves, with intermediate concentrations in epiphytes. Copper concentrations were similar in both the surface sediment and leaves but significantly lower in epiphytes. Carbon and nitrogen contents increased significantly with increasing δ13C in surface sediments of both the eelgrass and reference pools. Copper, Zn, Cd, and Pb also increased significantly with increasing δ13C in the surface sediment in the eelgrass pool but not in the reference pool. By decomposition of eelgrass leaves with epiphytes, which was examined in the eelgrass pool, copper and lead concentrations increased more than 2-fold and approximately a 10-fold, whereas zinc and cadmium concentrations decreased. The high copper and lead concentrations in the surface sediment result from accumulation in decomposed, shed leaves, whereas zinc and cadmium remobilized from decomposed shed leaves but may remain at higher concentrations in the leaves than in the original sediments. The results of our mesocosm study demonstrate that whether the accumulation or remobilization of trace metals during the decomposition of seagrass leaves is trace metal dependent, and that the decomposed seagrass leaves can cause copper and lead accumulation in sediments in seagrass ecosystems.

  10. Accumulation of Trace Metal Elements (Cu, Zn, Cd, and Pb) in Surface Sediment via Decomposed Seagrass Leaves: A Mesocosm Experiment Using Zostera marina L.

    Science.gov (United States)

    Hosokawa, Shinya; Konuma, Susumu; Nakamura, Yoshiyuki

    2016-01-01

    Accumulation of Cu, Zn, Cd, and Pb in the sediment of seagrass ecosystems was examined using mesocosm experiments containing Zostera marina (eelgrass) and reference pools. Lead was approximately 20-fold higher in the surface sediment in the eelgrass pool than in eelgrass leaves and epiphytes on the eelgrass leaves, whereas zinc and cadmium were significantly lower in the surface sediment than in the leaves, with intermediate concentrations in epiphytes. Copper concentrations were similar in both the surface sediment and leaves but significantly lower in epiphytes. Carbon and nitrogen contents increased significantly with increasing δ13C in surface sediments of both the eelgrass and reference pools. Copper, Zn, Cd, and Pb also increased significantly with increasing δ13C in the surface sediment in the eelgrass pool but not in the reference pool. By decomposition of eelgrass leaves with epiphytes, which was examined in the eelgrass pool, copper and lead concentrations increased more than 2-fold and approximately a 10-fold, whereas zinc and cadmium concentrations decreased. The high copper and lead concentrations in the surface sediment result from accumulation in decomposed, shed leaves, whereas zinc and cadmium remobilized from decomposed shed leaves but may remain at higher concentrations in the leaves than in the original sediments. The results of our mesocosm study demonstrate that whether the accumulation or remobilization of trace metals during the decomposition of seagrass leaves is trace metal dependent, and that the decomposed seagrass leaves can cause copper and lead accumulation in sediments in seagrass ecosystems.

  11. Identification and analysis of red sea mangrove (Avicennia marina microRNAs by high-throughput sequencing and their association with stress responses.

    Directory of Open Access Journals (Sweden)

    Basel Khraiwesh

    Full Text Available Although RNA silencing has been studied primarily in model plants, advances in high-throughput sequencing technologies have enabled profiling of the small RNA components of many more plant species, providing insights into the ubiquity and conservatism of some miRNA-based regulatory mechanisms. Small RNAs of 20 to 24 nucleotides (nt are important regulators of gene transcript levels by either transcriptional or by posttranscriptional gene silencing, contributing to genome maintenance and controlling a variety of developmental and physiological processes. Here, we used deep sequencing and molecular methods to create an inventory of the small RNAs in the mangrove species, Avicennia marina. We identified 26 novel mangrove miRNAs and 193 conserved miRNAs belonging to 36 families. We determined that 2 of the novel miRNAs were produced from known miRNA precursors and 4 were likely to be species-specific by the criterion that we found no homologs in other plant species. We used qRT-PCR to analyze the expression of miRNAs and their target genes in different tissue sets and some demonstrated tissue-specific expression. Furthermore, we predicted potential targets of these putative miRNAs based on a sequence homology and experimentally validated through endonucleolytic cleavage assays. Our results suggested that expression profiles of miRNAs and their predicted targets could be useful in exploring the significance of the conservation patterns of plants, particularly in response to abiotic stress. Because of their well-developed abilities in this regard, mangroves and other extremophiles are excellent models for such exploration.

  12. Marine diatoms from Buenos Aires coastal waters (Argentina: II. Thalassionemataceae and Rhaphoneidaceae Diatomeas marinas de aguas costeras de la Provincia de Buenos Aires (Argentina: II. Thalassionemataceae y Rhaphoneidaceae

    Directory of Open Access Journals (Sweden)

    EUGENIA A SAR

    2007-03-01

    Full Text Available This study describes the diversity of the species belonging to the diatom families Thalassionemataceae Round and Rhaphoneidaceae Forti frequently found in the temperate marine coastal waters of Buenos Aires Province, Argentina, from October 1994 to September 2000. It comprises morphological, taxonomic and distributional analysis of species found in planktonic samples collected at San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar and Villa Gesell. Raw and cleaned samples were analysed with light and scanning electron microscopy. Four taxa of the genus Thalassionema Grunow ex Mereschkowsky amend. Hallegraeff, one of the genus Lioloma Hasle, two of the genus Delphineis Andrews and one of the genus Rhaphoneis Ehrenberg, were identified. Thalassionema pseudonitzschioides (Schuette & Schrader Hasle, Thalassionema synedriforme (Greville Hasle and Lioloma pacificum (Cupp Hasle in Hasle & Syvertsen are new records for ArgentinaEste estudio describe la diversidad de especies de diatomeas pertenecientes a las familias Thalassionemataceae Round and Rhaphoneidaceae Forti encontradas frecuentemente en aguas costeras marinas de la Provincia de Buenos Aires, Argentina, entre octubre de 1994 y septiembre de 2000. En él se lleva a cabo el estudio morfológico, taxonómico y distribucional de las especies halladas en muestras planctónicas colectadas en San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar y Villa Gesell. Material sin tratar y tratado fue analizado con microscopio óptico y microscopio electrónico de barrido. Cuatro taxa de Thalassionema Grunow ex Mereschkowsky amend. Hallegraeff, uno de Lioloma Hasle, dos de Delphineis Andrews y uno de Rhaphoneis Ehrenberg, fueron identificados. Thalassionema pseudonitzschioides (Schuette & Schrader Hasle, Thalassionema synedriforme (Greville Hasle y Lioloma pacificum (Cupp Hasle in Hasle & Syvertsen son reportadas por

  13. The Agia Marina Xyliatou Observatory: A remote supersite in Cyprus to monitor changes in the atmospheric composition of the Eastern Mediterranean and the Middle East

    Science.gov (United States)

    Sciare, Jean

    2016-04-01

    The Eastern Mediterranean and Middle East (EMME) region has been identified as one of the hot spot region in the world strongly influenced by climate changes impacts. This region is characterized by rapidly growing population with contrasting economic development, strong environmental gradients and climate extremes. However, long-term observations of the atmospheric constituents (gaseous and particulate) of the atmosphere at a remote site representative of EMME is still missing making difficult to assess current and future impacts on air quality, water resources and climate. In collaboration with the Department of Labour Inspection and in the frame of French research programs (ChArMEx and ENVI-Med "CyAr") and the EU H2020 "ACTRIS-2" (2015-2019) project, CyI and CNRS are putting unprecedented efforts to implement at a rural site of Cyprus (Agia Marina Xyliatou) a unique infrastructure to monitor key atmospheric species relevant to air quality and climate. A large set of real-time instrumentations is currently deployed to characterize reactive gases (incl. O3, CO, NOx, SO2, VOC), in-situ aerosol properties (mass, size distribution, light scatt./absorption/extinction coef. and chemistry) and as well as integrated optical properties (sunphotomer, solar flux). Through Transnational access (H2020 ACTRIS2), this station is offering to (non-)EU partners (Research, SMEs) a new atmospheric facility to monitor long range transported clean/polluted air masses from 3 different continents (Europe, Africa, Middle East) and investigate aerosol-cloud interactions through the use of UAV and a mountain site (Troodos, 1900m asl). We will present here an overview of this new research infrastructure and provide a first glance of key features observed from gas/aerosol measurements obtained in 2015

  14. Linguistic and paralinguistic marks of the emotion management and ethos-building in Ms. Marina Silva´s discourse, in the talk show Jô 11/2

    Directory of Open Access Journals (Sweden)

    Cláudio Humberto Lessa

    2015-03-01

    Full Text Available De nombreuses études montrent comment les médias ont transformé l´éloquence po­litique, par exemple, Rubim (2004 et Courtine (2006. Le hommo politicus a adopté une rhétorique marquée par un style dialogué et familial aussi. Aujourd´hui, dans les campagnes électorales, on valorise plus l´ image et la vie privée des politiciens que leurs idées. Dans cet article, j´analyse l’extrait d´une interview donnée par la ex-première ministre Marina Silva dans le talk show Jô 11/2. J´observe les indices verbaux et para-verbaux dans le discours de Mme Silva qui puissent indiquer com­ment elle cherche à contrôler ses émotions et à projeter son ethos en se basant sur une argumentation fondée sur le logos. Pour analyser la diversité pluri-sémiotique de ce discours, j´ai utilisé les concepts de modalisation et modulation selon Vion (1992; 2003. Je comprend le discours en tant qu´activité dialogique de production textuelle. Cette activité est determinée par de facteurs historiques, culturels, elle est produite aussi dans une situation de communication dans laquelle les sujets jouent de rôles sociaux, signalisent de positionnements, exercent une attitude active et responsive dans le processus communicatif: ils répondent à des énoncés anterieurs (les divers interdiscours et ils projetent ses allocutions en prévoyant des destinateurs potencials.

  15. Del “mar es de todos” al mar reservado: turistas, poblaciones de pescadores y reservas marinas en Canarias

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    José J. Pascual

    2003-01-01

    Full Text Available Los patrones de desarrollo de las últimas décadas en Canarias y en otras zonas del Estado han originado nuevos usos del espacio marítimo y litoral. Frente a los tradicionales vinculados a la pesca, ahora dominan frecuentemente los turísticos y recreativos. La naturaleza, construida o recreada, se convierte especialmente en los últimos años en un atractivo clave para muchos destinos. En este contexto, las reservas marinas intentan preservar ciertas zonas de especial valor biológico de los excesos de la pesca, a la vez que deberían conjugar los usos turísticos y recreativos a realizar en tales espacios con la conservación de sus valores naturales. En Canarias han constituido uno de los instrumentos claves de la política de conservación y gestión de pesquerías en las áreas costeras de las Islas. Actualmente hay tres en funcionamiento, siguiendo una tendencia cada vez más general en todo el mundo. Pero a la vez que con ellas se controla la extracción de recursos por los profesionales, se impulsan una serie de usos vinculados a determinadas formas de turismo que han generado importantes transformaciones en las poblaciones vinculadas a estas zonas protegidas. Otros impactos inducidos por el turismo o la acuicultura han alterado también sus estrategias económicas o el uso de los espacios tanto en tierra como en el mar

  16. The highly reduced and fragmented mitochondrial genome of the early-branching dinoflagellate Oxyrrhis marina shares characteristics with both apicomplexan and dinoflagellate mitochondrial genomes.

    Science.gov (United States)

    Slamovits, Claudio H; Saldarriaga, Juan F; Larocque, Allen; Keeling, Patrick J

    2007-09-14

    The mitochondrial genome and the expression of the genes within it have evolved to be highly unusual in several lineages. Within alveolates, apicomplexans and dinoflagellates share the most reduced mitochondrial gene content on record, but differ from one another in organisation and function. To clarify how these characteristics originated, we examined mitochondrial genome form and expression in a key lineage that arose close to the divergence of apicomplexans and dinoflagellates, Oxyrrhis marina. We show that Oxyrrhis is a basal member of the dinoflagellate lineage whose mitochondrial genome has some unique characteristics while sharing others with apicomplexans or dinoflagellates. Specifically, Oxyrrhis has the smallest gene complement known, with several rRNA fragments and only two protein coding genes, cox1 and a cob-cox3 fusion. The genome appears to be highly fragmented, like that of dinoflagellates, but genes are frequently arranged as tandem copies, reminiscent of the repeating nature of the Plasmodium genome. In dinoflagellates and Oxyrrhis, genes are found in many arrangements, but the Oxyrrhis genome appears to be more structured, since neighbouring genes or gene fragments are invariably the same: cox1 and the cob-cox3 fusion were never found on the same genomic fragment. Analysing hundreds of cDNAs for both genes and circularized mRNAs from cob-cox3 showed that neither uses canonical start or stop codons, although a UAA terminator is created in the cob-cox3 fusion mRNA by post-transcriptional oligoadenylation. mRNAs from both genes also use a novel 5' oligo(U) cap. Extensive RNA editing is characteristic of dinoflagellates, but we find no editing in Oxyrrhis. Overall, the combination of characteristics found in the Oxyrrhis genome allows us to plot the sequence of many events that led to the extreme organisation of apicomplexan and dinoflalgellate mitochondrial genomes.

  17. Efectividad del monitoreo de la anidación de tortugas marinas para determinar el éxito reproductivo en playas del sur de Cuba

    Directory of Open Access Journals (Sweden)

    Julia Azanza-Ricardo

    2015-07-01

    Full Text Available El monitoreo de las anidaciones es muy útil como herramienta para la conservación pero el esfuerzo de trabajo en diferentes áreas puede variar grandemente. En Cuba, se aplican cuatro enfoques diferentes: monitoreo sistemático nocturno y diurno (MSN, y monitoreo esporádico con o sin comprobación de nidos (MECC. La cantidad y exactitud de los datos tomados y la calidad de la información derivada de ellos difieren. Por esta razón, en el presente trabajo se evalúa la efectividad de cada enfoque para determinar el éxito reproductivo de tortugas marinas en Cuba. El MSN sólo se realiza en las playas de anidación de la Península de Guanahacabibes, mientras que el MECC es el más extendido en el país. La porción de la temporada de anidación de cada una de las tres especies que anidan en Cuba (Chelonia mydas, Caretta caretta y Eretmochelys imbricata que se cubre con personal de monitoreo es baja para la mayoría de las playas, y sobre todo en el caso de E. imbricata. Se detectaron diferencias entre el monitoreo sistemático y esporádico, por tanto, la capacidad de detectar rastros falsos y verdaderos depende esencialmente de la frecuencia de monitoreo. Esto afecta la capacidad para evaluar el éxito de la anidación por playas. A pesar del incremento en los esfuerzos realizados en Cuba para el seguimiento de las principales colonias de anidación, se deben identificar nuevas estrategias para garantizar la correcta toma de información, y una mayor eficiencia del programa de monitoreo para obtener la mayor información posible de cada una de las especies con un adecuado balance de costo-beneficio.

  18. Thalassotalea marina sp. nov., isolated from a marine recirculating aquaculture system, reclassification of Thalassomonas eurytherma as Thalassotalea eurytherma comb. nov. and emended description of the genus Thalassotalea.

    Science.gov (United States)

    Hou, Ting-Ting; Liu, Ying; Zhong, Zhi-Ping; Liu, Hong-Can; Liu, Zhi-Pei

    2015-12-01

    A Gram-stain-negative, facultatively anaerobic bacterium, strain QBLM2T, was isolated from rearing water of a marine recirculating aquaculture system in Tianjin, China. Its taxonomic position was investigated through a polyphasic approach. Cells of strain QBLM2T were non-spore-forming rods, motile by means of a single polar flagellum. Positive for oxidase and catalase. Growth occurred at 15-40 °C (optimum 30 °C), at pH 6.5-10.5 (optimum pH 7.5-8.5) and in the presence of 0-5.0 % (w/v) NaCl (optimum 3 %). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain QBLM2T formed a distinct lineage within the genus Thalassotalea and exhibited sequence similarities of 94.5-96.3 % to members of the genus Thalassotalea. The predominant fatty acids (>10 %) were C17 : 1ω8c and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The major polar lipids were phosphatidylglycerol and phosphatidylethanolamine. Ubiquinone 8 (Q-8) was the major ubiquinone. The DNA G+C content was 37.1 mol%. Based on the data above, strain QBLM2T is considered to represent a novel species of the genus Thalassotalea, for which the name Thalassotalea marina sp. nov. is proposed. The type strain is QBLM2T ( = CGMCC 1.12814T = KCTC 42731T). Phylogenetic analyses indicated that Thalassomonas eurytherma Za6a-12T fell within the genus Thalassotalea, so it is reclassified as Thalassotalea eurytherma comb. nov. and the description of the genus Thalassotalea is emended.

  19. Isolation and identification of compounds from marine mangrove plant Avicennia marina%红树植物白骨壤化学成分的分离鉴定

    Institute of Scientific and Technical Information of China (English)

    孙昱; 丁怡; 林文翰

    2009-01-01

    目的:研究红树植物白骨壤(Avicennia marina)叶子部位次生代谢产物的结构多样性.方法:采用多种色谱方法进行分离纯化,通过波谱方法,并对照文献鉴定化合物结构.结果:分离并鉴定了21个苯丙素和萘醌类化合物,包括3个新化合物,分别是erythro-guaiacylglycerol-β-ferulic acid ether(1),marinnone A(16)和marinnone B(17);18个已知物,分别是threo-guaiacylglycerol-β-ferulic acid ether(2),eleutheroside E2(3),(+)-lirioresinol A(4),dihydroxymethyl-his(3,5-dimethoxy-4-hydroxyphenyl)tetrahydrofuran-9-O-β-glucopyranoside(5),(+)-lyonire-sinol 3α-O-β-D-glucopyranoside(6),(-)-lyoniresinol 3α-O-β-D-glucopyranoside(7),epi-pinoresinol(8),leucoseceptoside A(9),jionoside C(10),salsaside A(11),ilicifolioside A(12),acteoside(13),isoacteoside(14),ethyl ferulate(15),avicennone D(18),avicenone E(19),avicennol C(20),stenocarpoquinone B(21),其中化合物1和2互为差向异构体,16和17互为同分异构体.结论:化合物1,16,17为新化合物,13个已知化合物2~12,14,15为首次从该属植物中获得.

  20. Population structure, density and food sources of Terebralia palustris (Potamididae: Gastropoda) in a low intertidal Avicennia marina mangrove stand (Inhaca Island, Mozambique)

    Science.gov (United States)

    Penha-Lopes, Gil; Bouillon, Steven; Mangion, Perrine; Macia, Adriano; Paula, José

    2009-09-01

    Population structure and distribution of Terebralia palustris were compared with the environmental parameters within microhabitats in a monospecific stand of Avicennia marina in southern Mozambique. Stable carbon and nitrogen isotope analyses of T. palustris and potential food sources (leaves, pneumatophore epiphytes, and surface sediments) were examined to establish the feeding preferences of T. palustris. Stable isotope signatures of individuals of different size classes and from different microhabitats were compared with local food sources. Samples of surface sediments 2.5-10 m apart showed some variation (-21.2‰ to -23.0‰) in δ13C, probably due to different contributions from seagrasses, microalgae and mangrove leaves, while δ15N values varied between 8.7‰ and 15.8‰, indicating that there is a very high variability within a small-scale microcosm. Stable isotope signatures differed significantly between the T. palustris size classes and between individuals of the same size class, collected in different microhabitats. Results also suggested that smaller individuals feed on sediment, selecting mainly benthic microalgae, while larger individuals feed on sediment, epiphytes and mangrove leaves. Correlations were found between environmental parameters and gastropod population structure and distribution vs. the feeding preferences of individuals of different size classes and in different microhabitats. While organic content and the abundance of leaves were parameters that correlated best with the total density of gastropods (>85%), the abundance of pneumatophores and leaves, as well as grain size, correlated better with the gastropod size distribution (>65%). Young individuals (height < 3 cm) occur predominantly in microhabitats characterized by a low density of leaf litter and pneumatophores, reduced organic matter and larger grain size, these being characteristic of lower intertidal open areas that favour benthic microalgal growth. With increasing shell

  1. Identification and Analysis of Red Sea Mangrove (Avicennia marina) microRNAs by High-Throughput Sequencing and Their Association with Stress Responses

    KAUST Repository

    Khraiwesh, Basel

    2013-04-08

    Although RNA silencing has been studied primarily in model plants, advances in high-throughput sequencing technologies have enabled profiling of the small RNA components of many more plant species, providing insights into the ubiquity and conservatism of some miRNA-based regulatory mechanisms. Small RNAs of 20 to 24 nucleotides (nt) are important regulators of gene transcript levels by either transcriptional or by posttranscriptional gene silencing, contributing to genome maintenance and controlling a variety of developmental and physiological processes. Here, we used deep sequencing and molecular methods to create an inventory of the small RNAs in the mangrove species, Avicennia marina. We identified 26 novel mangrove miRNAs and 193 conserved miRNAs belonging to 36 families. We determined that 2 of the novel miRNAs were produced from known miRNA precursors and 4 were likely to be species-specific by the criterion that we found no homologs in other plant species. We used qRT-PCR to analyze the expression of miRNAs and their target genes in different tissue sets and some demonstrated tissue-specific expression. Furthermore, we predicted potential targets of these putative miRNAs based on a sequence homology and experimentally validated through endonucleolytic cleavage assays. Our results suggested that expression profiles of miRNAs and their predicted targets could be useful in exploring the significance of the conservation patterns of plants, particularly in response to abiotic stress. Because of their well-developed abilities in this regard, mangroves and other extremophiles are excellent models for such exploration. © 2013 Khraiwesh et al.

  2. El desplazamiento y la fragmentación del yo poético en las poesías de Charlotte Mew, Karin Boye y Marina Tsvietáieva

    OpenAIRE

    Kragulj, Ljiljana

    2014-01-01

    El presente trabajo tiene su origen en una larga investigación desarrollada en torno a un proyecto inicial, escrito en lengua inglesa, sobre el desplazamiento y la fragmentación del yo poético en algunas de las obras más representativas de Charlotte Mew (1869-1928), Karin Boye (1900-1941) y Marina Tsvietáieva (1894-1941). Las líneas metodológicas han determinado la organización de este trabajo en cuatro partes diferenciadas, aunque necesariamente relacionadas en la progresión argumentativa: e...

  3. Marina Caparini and Otwin Marenin (Eds, Transforming Police in Central and Eastern Europe – Process and Progress, DCAF – Geneva Centre for the Democratic Control of Armed Forces/ LIT, 2004.

    Directory of Open Access Journals (Sweden)

    Branko Lobnikar

    2006-11-01

    Full Text Available The book is divided in two parts: the introduction and conclusion (by Marina Caparini and Otwin Marenin and several case studies of individual police organizations in Central and Eastern Europe. In the introduction, Caparini and Marenin emphasise the importance of the police in a democratic society. The main function of the police – the provision of security – is one of the basic demands laid against the state by its society. Democratic policing is described in the first part of the introduc...

  4. Determinación de los factores que inciden en la captura incidental de aves marinas en la flota palangrera pelágica chilena Determination of factors affecting the bycatch of seabirds in Chilean pelagic longline fleet

    Directory of Open Access Journals (Sweden)

    Andrés González

    2012-09-01

    Full Text Available Se analizó la relación entre la variabilidad de la tasa de captura incidental de aves marinas en la pesquería palangrera pelágica de pez espada (Xiphias gladius y diversos factores temporales, ambientales, espaciales y pesqueros, entre 2007 y 2009. Los resultados muestran que las operaciones de pesca de esta flota afectan principalmente a los albatros, grupo que concentra el 83,7% de la captura incidental de aves marinas registrada en el período. Esta captura incidental se debe en primera instancia a la presencia del Frente Subtropical del Pacífico Sur, sistema que provoca la sobreposición entre la actividad de esta flota con la distribución espacial de aves marinas durante la fase residente del período no reproductivo. La variabilidad en esta captura incidental estaría fuertemente relacionada a los estímulos visuales (medido mediante el porcentaje de luces químicas y porcentaje de calamar y las condiciones de luminosidad ambiental existentes en los períodos de forrajeo diurno y nocturno de estas aves marinas durante el calado (medido a través del desfase de la hora del ocaso con respecto a la hora de inicio del calado y fase lunar.We analized the relationship between the variability in the rate of seabird bycatch in pelagic longline fishery for swordfish (Xiphias gladius, and several temporary, environmental, spatial and fisheries factors for the fishing period from 2007 to 2009. The results show that the fishing operations of this fleet mainly affect the albatross, group that accounts for 83.7% of the incidental catch of seabirds recorded in the period. This bycatch is due primarily to the presence of the South Pacific Subtropical Front, a system that causes the overlap between the activities of this fleet with the spatial distribution of these seabird species during the resident phase of the nonbreeding period. By the other hand, the variability in bycatch would be strongly linked to visual stimuli (measured by the percentage of

  5. Reserva marina de interés pesquero Ría de Cedeira (Galicia, NO España): caracterización ecológica y pesquera

    OpenAIRE

    Tubío Gómez, Ana

    2016-01-01

    [Resumen] Esta tesis doctoral pretende proporcionar una línea base de conocimiento biológico y pesquero de la Ría de Cedeira que sirva como punto de partida para poder evaluar el efecto de la protección de la Reserva Marina de Interés Pesquero (RMIP) Ría de Cedeira, y que pueda ser utilizada para su futura monitorización. En primer lugar se realiza una caracterización ecológica, centrada en el estudio de la dinámica espacio temporal de las comunidades biológicas de los fondos s...

  6. La reserva marina de interés pesquero "Os Miñarzos": línea base de las comunidades biológicas y análisis del efecto reserva temprano

    OpenAIRE

    Fernández Márquez, Diana

    2016-01-01

    [Resumen] Os Miñarzos es una Reserva Marina de Interés Pesquero (RMIP) que fue creada en 2007 como herramienta de gestión de los recursos costeros. Ocupa una extensión de 2074.2 ha y está formada por dos reservas integrales y una zona parcialmente protegida. El principal objetivo de este trabajo, el cual se desarrolló a lo largo de los tres primeros años tras la creación de la RMIP, consistió en establecer la línea base del estado de sus comunidades biológicas (macroalgas...

  7. Los colores de las conchas marinas en el antiguo occidente de México. El caso del Posclásico Seashell color in ancient western Mexico. The case of the Postclassic

    OpenAIRE

    Luis Gómez-Gastélum

    2007-01-01

    A partir de los estudios sobre la cosmovisión mesoamericana -en especial aquellos relacionados con el cuerpo humano y las significaciones del color-, se analizan los patrones de uso de las conchas marinas y los objetos elaborados con éstas en las sociedades prehispánicas del occidente de México durante el periodo Posclásico (1100-1350 d.C.), con la finalidad de acercarse al simbolismo que les fueron otorgados por parte de quienes las utilizaron.Based on studies of Mesoamerican cosmology, espe...

  8. Entendiendo, Evaluando y Solucionando los Problemas de Contaminación de Luz en Playas de Anidamiento de Tortugas Marinas/Understanding, assessing, and resolving light- pollution problems on sea turtle nesting beaches

    OpenAIRE

    Witherington, Blair E.; Martin, R. Erik

    2003-01-01

    Mantener al público informado sobre los problemas de la contaminación con luz de las playas de anidamiento de tortugas es un paso fundamental para oscurecer las playas de tortugas marinas. Muchas de aquellas personas responsables de esta iluminación no tienen conocimiento del efecto negativo que esto ocasiona y están dispuestos a corregir el problema voluntariamente una vez que son informados. Sin embargo, a menudo es necesaria legislación para un mayor control de la i...

  9. Co-ocurrencia de Chattonella marina y Gymnodinium catenatum en la Bahía de La Paz, Golfo de California (primavera 2009 Co-ocurrence of Chattonella marina and Gymnodinium catenatum in Bahía de La Paz, Gulf of California (Spring 2009

    Directory of Open Access Journals (Sweden)

    David Javier López-Cortés

    2011-08-01

    Full Text Available Durante el período del 24 de marzo al 14 de mayo de 2009 en la Bahía de La Paz, se obtuvieron muestras de agua y de red para análisis de fitoplancton. Una alícuota se fijó con una solución de Lugol para la identificación y cuantificación, la de red se utilizó para la identificación in vivo. Semanalmente se midió la temperatura in situ, se determinaron nutrientes inorgánicos y clorofila a en tres estaciones. Se identificaron dos especies: Chattonella marina (Subrahmanyan Y. Hara et Chihara y Gymnodinium catenatum Graham. Chattonella marina fue la especie más abundante con densidades de 14 × 10³ a 36 × 10³ cél. L-1 a nivel sub-superficial. Gymnodinium catenatum se registró con densidades de 1 × 10³ a 19 × 10³ cél. L-1. La temperatura del agua fue homogénea desde la superficie hasta los 20 m de profundidad, con un intervalo de 19.5 a 22.0 °C y de 20.0 a 21.5 °C a finales de marzo y abril respectivamente. En la primera mitad de mayo se inició la estratificación, con una diferencia térmica de 5.0 °C entre la superficie y los 20 m. Los nitratos variaron de 0.5 a 11.0 μM y los ortofosfatos de 0.4 a 2.6 μM. La clorofila a en marzo presentó un valor en superficie de 7.5 mg m-3 y a 20 m de 3.5 mg m-3, en mayo varió de 2.0 a 7.0 mg m-3. Se concluye que la aparición de las dos especies observadas en este estudio se asocia a la disminución de los procesos de mezcla en esta bahía.During the period of 24 March to 14 May 2009, water and net samples were obtained for phytoplankton analyses; one aliquot was fixed in Lugol's solution for species quantification and identification. Net samples were used for the identification of live phytoplankton species. Additionally, temperature in situ, chlorophyll a and inorganic nutrients were measured weekly in three stations. Two species were identified: Chattonella marina (Subrahmanyan Y. Hara et Chihara and Gymnodinium catenatum Graham. Chattonella marina was the most abundant species

  10. Blood lead levels, δ-ALAD inhibition, and hemoglobin content in blood of giant toad (Rhinella marina) to assess lead exposure in three areas surrounding an industrial complex in Coatzacoalcos, Veracruz, Mexico.

    Science.gov (United States)

    Ilizaliturri-Hernández, César Arturo; González-Mille, Donaji Josefina; Mejía-Saavedra, Jesús; Espinosa-Reyes, Guillermo; Torres-Dosal, Arturo; Pérez-Maldonado, Iván

    2013-02-01

    The Coatzacoalcos Region in Veracruz, Mexico houses one of the most important industrial complexes in Mexico and Latin America. Lead is an ubiquitous environmental pollutant which represents a great risk to human health and ecosystems. Amphibian populations have been recognized as biomonitors of changes in environmental conditions. The purpose of this research is to measure exposure to lead and evaluate hematological and biochemical effects in specimens of giant toads (Rhinella marina) taken from three areas surrounding an industrial complex in the Coatzacoalcos River downstream. Lead levels in toads' blood are between 10.8 and 70.6 μg/dL and are significantly higher in industrial sites. We have found a significant decrease in the delta-aminolevulinic acid dehydratase (δ-ALAD) activity in blood from 35.3 to 78 % for the urban-industrial and industrial sites, respectively. In addition, we have identified a strong inverse relationship between the δ-ALAD activity and the blood lead levels (r = -0.84, p < 0.001). Hemoglobin and mean corpuscular hemoglobin levels, as well as the condition factor, are found to be lower at industrial sites compared with the reference sites. Our results suggest that the R. marina can be considered a good biomonitor of the δ-ALAD activity inhibition and hematological alterations at low lead concentrations.

  11. 红树林秋茄、桐花树、白骨壤混交生长效果研究%Study on the Growth Effect of Mangrove Kandelia candel,Aegiceras corniculatum and Avicennia marina

    Institute of Scientific and Technical Information of China (English)

    陈世勇

    2014-01-01

    The cultivation of Kandelia candel,Aegiceras corniculatum and Avicennia marina in the beach, through the management of 11a,to investigate and analyze the volume growth,the Mangrove Kandelia can-del,Aegiceras corniculatum,Avicennia marina trees. The results show that:Kandelia candel,Aegiceras cornic-ulatum,Avicennia marina,mixed forest tree growth,than Kandelia candel,Aegiceras corniculatum,Avicennia marina,pure forest growth effect is good. Mixed forest trees tree height,DBH,height under branch,crown,re-spectively than those of pure forest grown trees tall and 7.69%,7.5%,11.11%,2.17%,11.41%,6.67% in di-ameter,branch 2.01%,tall 10.95%,8.57%,5%,10.53%,13.50% crown. Kandelia candel,Aegiceras cornicula-tum,Avicennia marina in the shallow water,tree growth,than the tide in forest growth effect is good,the prop roots,plate-like roots,absorb water pollutants can be strong,salts,row to plants in vitro through photo-synthesis,can go to nitrogen and phosphorus and other pollutants,purification of sea environment,anti wave support the waves,coastal erosion,to protect the ecological environment effect.%在海滩涂上栽培秋茄、桐花树、白骨壤,经过11a的经营管理,对红树林秋茄、桐花树、白骨壤林木的生长量进行调查分析。结果表明:红树林秋茄、桐花树、白骨壤混交林的林木生长,均比秋茄、桐花树、白骨壤纯林的林木生长效果好。混交林生长的林木树高、胸径、枝下高、树冠,分别比纯林林木生长的树木高大7.69%、7.5%、11.11%,胸径粗2.17%、11.41%、6.67%,枝下高大2.01%、10.95%、8.57%,冠幅大5.00%、10.53%、13.50%。红树林秋茄、桐花树、白骨壤林木在浅潮位生长,比中潮位林木生长效果好,支柱根大、板状根系发达,吸收海水污染物强,能将盐类物质通过叶片光合作用排到植物体外,可去氮和磷等污染物,净化海边环境,防浪护堤,防止海岸侵蚀,起到保护生态环境作用。

  12. Changes in serum and urinary corticosterone and testosterone during short-term capture and handling in the cane toad (Rhinella marina).

    Science.gov (United States)

    Narayan, Edward J; Cockrem, John; Hero, Jean-Marc

    2013-09-15

    Non-invasive endocrine monitoring with minimally invasive biological samples, such as urine, is being used widely for conservation biology research on amphibians. Currently, it is unknown how closely urinary measurements correspond with the traditional serum hormone measurements. We compared urinary and serum concentrations of corticosterone (CORT) and testosterone (T) in adult male cane toads (Rhinella marina) using a standard capture and handling (short-term stressor) protocol. Free-living male cane toads were captured and sampled for baseline urine (0h) with a second urine sample taken at 0.5h and hourly between 1 and 8h. A single blood sample was collected from each toad after the final urine sampling and capture handling. The mean serum CORT concentration increased between 0 and 0.5h, reaching the highest level between 6 and 8h. The mean urinary CORT concentration increased with a lag-time of 1h and continued to increase up to 8h. The mean level of serum T decreased between 0 and 7h and increased between 7 and 8h. Mean urinary T concentration decreased with a lag-time of 0.5h. Urinary T levels did not change between 4 and 8h. Mean serum T levels reached 50% of the original 0h value at 1h while mean serum CORT levels reached 200% of the original 0h value within 0.5h. Mean urinary T levels reached 50% of the original 0h value within 3h while mean urinary CORT levels reached 200% of the original 0h value within 3h. The inter-individual variation in baseline serum and urinary CORT and T levels were highly comparable, suggesting that baseline urine sample provides a reliable indicator of the physiological status of the animal. Overall, the results have demonstrated that urine sampling and standard capture handling protocol provide reliable measures of baseline corticosterone and testosterone, as well as short-term stress hormone responses in amphibians.

  13. Adaptive management of marine protected areas in Chile: a method for his evaluation Gestión adaptativa en áreas marinas protegidas de Chile: un método para su evaluación

    Directory of Open Access Journals (Sweden)

    Andrés Guajardo

    2012-09-01

    Full Text Available The evaluation of the performance of the management is essential to fulfill the objectives in a Marine Protected Area (MPA. Therefore, Robert Pomeroy in 2004 presents a manual to evaluate the development of the marine protected areas through time, by using of indicators which measure the biophysical state, socioeconomic state and governance. The present work adopts the use of those indicators to evaluate the performance of the management in the Marine Reserve Chanaral Island, Atacama region. The results of the evaluation show a partial level of protection objectives fulfillment, suggesting the lack of efficient management of the reserve to ensure its suitable development. This work also presented a descriptive model, that interprets the behavior that area would facein front of two opposed scenarios, and the expected due to inefficient management of the area and otherwise an adaptive management.La evaluación del desempeno en la gestión es esencial para el eventual logro de los objetivos de las áreas marinas protegidas (AMP. Robert Pomeroy en 2004 presenta un manual para evaluar el desarrollo de las áreas marinas protegidas en el tiempo, por medio de la medición de indicadores de estado: biofísicos, socioeconómicos y de gobernabilidad. El presente trabajo adopta el uso de estos indicadores, para evaluar el desempeno en la gestión de la Reserva Marina Isla Chanaral, región de Atacama. Los resultados de su evaluación muestran que se cumplen parcialmente los objetivos de protección, sugiriendo la falta de una gestión efectiva que asegure el adecuado desarrollo de la reserva. En el trabajo también se presenta un modelo descriptivo que interpreta el comportamiento que tendría el área frente a dos escenarios opuestos y los resultados esperados a causa de una gestión ineficiente del área y en caso contrario una gestión adaptativa.

  14. 荣成天鹅湖大叶藻(Zostera marina)间2种小型腹足类的分类学研究%TAXONOMY OF 2 SMALL GASTROPODS AMONG ZOSTERA MARINA L.IN THE SWAN LAKE, RONGCHENG

    Institute of Scientific and Technical Information of China (English)

    刘静; 管洪在; 张素萍; 郭小芳; 杨学伶; 王海艳

    2013-01-01

    小型腹足类生物在我国种类繁多,但其相关研究在国内基本属于空白.本文对荣成天鹅湖大叶藻间的2种小型腹足类生物进行了形态学及分子生物学(16S和28S rRNA基因片段)研究.结果表明,根据形态学所鉴定的短剑螺属未定种Machaeroplax sp.,应为畦螺属未定种Lirularia sp.;分子生物学研究结果支持形态学对刺绣翼螺Alaba picta的鉴定.同时,与A.picta有一定形态学差异的其它4种相近形态的小型腹足类,在基因序列及遗传距离上与刺绣翼螺非常接近,亦应为刺绣翼螺Alaba picta.%There is a great diversity of small gastropods in China, however, the related researches are nearly vacant. We sampled 2 species of small gastropods habitating among the Zostera marina L. from the Swan Lake, Rongcheng Bay, China and the 16S and 28S rRNA were sequenced. Based on the molecular data, sequences alignment, genetic distances and phylogenetic studies were conducted. The results showed that Machaeroplax sp. identified according to the morphology should be Lirularia sp.; and that 4 gastropods with obvious morphological variances from Alaba picta had been classified as Alaba picta according to the molecular analysis.

  15. Vsem Zhivagam Zhivago / Marina Suranova

    Index Scriptorium Estoniae

    Suranova, Marina

    2006-01-01

    10. mail algas Venemaa telekanalil NTV Aleksander Proshkini 11-osaline seriaal Boriss Pasternaki romaani "Doktor Zhivago" ainetel, kesksetes rollides Oleg Menshikov, Tshulpan Hamatova, Oleg Jankovski. Lavastaja A. Proshkin ning Komarovski osatäitja Oleg Jankovski kõnelevad rõhuasetustest uues ekraniseeringus

  16. Patrimonio Natural y Reservas Marinas

    Directory of Open Access Journals (Sweden)

    Cruz Modino, Raquel de la

    2004-01-01

    Full Text Available Marine reserves try to preserve some areas, with a special biologic interest, to the fish excess for to secure the protection, the regeneration and the marine recourses development. With them it is trying to regulate the different activities that are realized on these areas, and to conjugate tourist and leisure uses with the conservation their natural values. Perhaps, generality the regulation over uses that can to be developed on natural and fragile areas like these is restricted to establish limitations over the activities developed on the area. The creation of figures like this, on a tourist context, may to promote the realisation of a recreational activities in front of the traditional uses that can to stay limited in the protected area

  17. Los colores de las conchas marinas en el antiguo occidente de México. El caso del Posclásico Seashell color in ancient western Mexico. The case of the Postclassic

    Directory of Open Access Journals (Sweden)

    Luis Gómez-Gastélum

    2007-10-01

    Full Text Available A partir de los estudios sobre la cosmovisión mesoamericana -en especial aquellos relacionados con el cuerpo humano y las significaciones del color-, se analizan los patrones de uso de las conchas marinas y los objetos elaborados con éstas en las sociedades prehispánicas del occidente de México durante el periodo Posclásico (1100-1350 d.C., con la finalidad de acercarse al simbolismo que les fueron otorgados por parte de quienes las utilizaron.Based on studies of Mesoamerican cosmology, especially with regard to the human body and the meaning of color, we analyzed the use patterns of seashells and objects made from seashells in the Pre-Hispanic societies of western Mexico in the Postclassic period (1100-1530 A.D.. The goal was to understand the symbolism given to these objects by the people who utilized them.

  18. Il rudere della chiesa di Santa Lucia alla Marina di Cagliari. Architettura, archeologia e storia dell’arte per il recupero di un luogo della città medievale

    Directory of Open Access Journals (Sweden)

    Marco Cadinu

    2012-06-01

    The Saint Lucia church, located in the Marina suburb of Cagliari, is a ruin. To conserve the monument, an important effort is needed to understand the history of its architecture, a hypothetical previous church, and the cultural stratification of the surrounding area. The few architectural elements that still exist from the 17th century reconstruction interpret a characteristic late Renaissance and Controriforma style. In middle age the Santa Lucia site was in a strategic position, located close to the merchants port and the possessions of the Archbishop and the Judges of Cagliari. Ancient documents and modern analyses reveal a new image of Santa Lucia and its cultural impact. This study precedes the imminent archaeological excavation of the medieval strata and, later, the underlying Roman town.

  19. Olaf Kapella, Christiane Rille-Pfeiffer, Marina Rupp, Norbert F. Schneider (Hg.: Die Vielfalt der Familie. Tagungsband zum 3. Europäischen Fachkongress Familienforschung. Opladen u.a.: Verlag Barbara Budrich 2009.

    Directory of Open Access Journals (Sweden)

    Isabelle Josephine Kürschner

    2011-03-01

    Full Text Available Der im Anschluss an die 3. Europäische Fachkonferenz für Familienforschung erschienene Sammelband Die Vielfalt der Familie von Olaf Kapella, Christiane Rille-Pfeiffer, Marina Rupp und Norbert F. Schneider greift wichtige Trends in der jüngeren Entwicklung familialen Zusammenlebens in Europa auf. Neben der Formenvielfalt und Dynamik werden unterschied-liche nationale und internationale Rahmenbedingungen und entsprechende Entwicklungen ins Blickfeld genommen.This anthology contains the presentations of the third European symposium on Family Research in June 2008. The articles illustrate from various research perspectives how families live together in modern Europe and what family means today. In addition to the variety of forms and dynamic, various national and international parameters and their respective developments are analyzed.

  20. Marina Núñez o la construcción de un cíborg. Un discurso multimedia entre la utopía y la distopía

    Directory of Open Access Journals (Sweden)

    Isabel Tejeda Martín

    2012-04-01

    Full Text Available El presente artículo se propone revisar, a partir de un número importante de entre los proyectos multimedia más importantes realizados en las dos últimas décadas por la artista española Marina Núñez Jiménez (Palencia, 1966, la construcción que ha llevado a cabo de alegorías sobre el concepto de cíborg, tanto en su sentido utópico como distópico. Se analiza, en este sentido, el reciclaje que esta artista hace en su trabajo con los referentes religiosos católicos de la historia del arte, estudiando en concreto su intervención Carne para la sala de exposiciones de Verónicas, un espacio connotado de arquitectura barroca que en su tiempo fue una iglesia conventual.Nos basaremos en sus exposiciones entendidas como site-specific, en sus instalaciones, cajas de luz, vídeos y fotografías, imágenes que serán analizadas desde una perspectiva iconográfica, técnica y lingüística casi en su totalidad. Asimismo, estos trabajos se ponen en relación con los referentes críticos más importantes de la autora, Michel Foucault, Donna Haraway, Rosi Braidotti, etc.El artículo traza un recorrido por la literatura crítica existente sobre esta Marina Núñez aparecida tanto en revistas especializadas como en forma de textos de catálogos individuales, al tiempo que refiere sus profundas relaciones formales e iconográficas con la literatura Cíberpunk y con el cine de ciencia ficción.

  1. Integración florística de las algas marinas de la costa sur de Jalisco, México Floristic integration of the benthic marine algae from the southern coast of Jalisco, Mexico

    Directory of Open Access Journals (Sweden)

    A. Catalina Mendoza-González

    2011-03-01

    Full Text Available Se presentan los resultados obtenidos en un estudio sobre las algas marinas bentónicas en 7 localidades de la costa sur de Jalisco, México. Se determinó la presencia de 165 especies de algas marinas. Se identificaron 13 especies de Cyanophyta, 97 Rhodophyta, 28 Chlorophyta y 27 taxa de Heteroconthophyta. Cada especie se acompaña con datos sobre su distribución en el área de estudio, estado reproductivo, nivel de marea, hábitat, observaciones, epifitismo y número de herbario o de colecta. Se comparó la riqueza específica entre la estación climática de lluvias y la de secas, durante 1992,1993, 1997, 2000 y 2003. La división Rhodophyta dominó en términos de diversidad en relación con las 3 divisiones restantes. La ficoflora de la costa sur de Jalisco es de afinidad tropical y más diversa en la época de secas.We present results on the study on benthic marine algae in seven localities from the southern coast of Jalisco. We report 165 species: 13 Cyanophyta, 97 Rhodophyta, 28 Chlorophyta and 27 Heteroconthophyta. Each species includes data on its distribution, reproductive stages, tidal level, facies, epiphytism and herbarium's number. Species diversity was compared for 2 different climatic seasons during 1992, 1993, 1997, 2000 and 2003. The Rhodophyta are dominant in terms of diversity in relation to the other groups. The algal flora of the south coast of Jalisco is tropical and the greatest diversity was found during dry season.

  2. Estratigrafía cuaternaria del subsuelo de la cuenca inferior del río Paraná

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    Sergio Amato

    2009-06-01

    Full Text Available El área de estudio comprende el subsuelo de la cuenca inferior del río Paraná (zona del Delta del Paraná desde la latitud de la localidad de Diamante, en la provincia de Entre Ríos y hacia el sur hasta la localidad de San Fernando en la provincia de Buenos Aires. El relleno sedimentario moderno está relacionado directamente con la evolución de las condiciones ambientales durante el Cuaternario. Luego de la ejecución de un conjunto de perforaciones y de la obtención de algunos datos de afloramientos, se realiza un análisis de algunos de los eventos que han actuado dejando distintos tipos de registros geológicos que exceden al depósito deltaico actual. Se propone aquí, a partir del estudio litológico de depósitos de subsuelo y de la fracción de argilominerales que los componen, un modelo depositacional para la zona. De acuerdo a este análisis se ha definido que el evento ha tenido más de un pulso de avance y retroceso, lo cual involucra un aporte al conocimiento del fenómeno transgresivo- regresivo ocurrido durante el Holoceno. Se propone una alternancia de ambientes estuarinos y marginales costeros, que se repiten según la evolución de los pulsos de avance y el retroceso del mismo en el área de estudio. Por último y del análisis de los datos obtenidos hasta la actualidad, no se desprende si el retiro del mar desde el último gran pulso de la trasgresión se realizó en una sola etapa, o si se produjo con interrupciones por ascensos relativos de orden menor.

  3. La fauna cuaternaria de la cornisa cantábrica en las colecciones del Museo Nacional de Ciencias Naturales

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    Esperanza Cerdeño

    2005-01-01

    Full Text Available En este trabajo, se ha realizado la recopilación de los restos fósiles de mamíferos procedentes de los yacimientos pleistocenos de la cornisa cantábrica que se encuentran depositados en las colecciones del MNCN de Madrid. Se han revisado ejemplares de 57 localidades de Asturias, Cantabria y Pais Vasco, actualizando las listas faunísticas. Se incluyen breves comentarios sobre los yacimientos con restos más numerosos y una pequeña indicación acerca del posible origen de los distintos depósitos.

  4. Acumulaciones detríticas cuaternarias en el valle del río Oñati (Guipúzcoa.

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    UGARTE, F.M.; GONZALEZ, J.A., ALONSO, F.

    1984-01-01

    Full Text Available Se ha definido un espacio centrado en una cuenca hidrográfica (cuenca del río Oñati: cabecera del río Deba, y sobre él se ha llevado a cabo una investigación intensiva de búsqueda, localización y análisis sedimentológico de depósitos detríticos Cuaternarios. Se han catalogado varias docenas de depósitos de todo tipo: coluviones, fluviales, periglaciares...; teniéndose sólamente en cuenta los depósitos superficiales, dejando de lado los que se hallan en el interior de las cuevas. El objetivo que se pretende es el de aportar información que pueda ser utilizada en un próximo futuro, para tratar de reconstruir la evolución morfogenética del Cuaternario en nuestra región.

  5. Impacto de la luz artificial sobre la anidación de la tortuga marina Dermochelys coriacea (Testudines: Dermochelyidae, en playa Cipara, Venezuela

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    María Rondón Médicci

    2009-09-01

    Full Text Available En Playa Cipara, Península de Paria, Venezuela, se evaluó el impacto de la luz artificial sobre la anidación de la tortuga cardón. Se estimó el número de anidaciones y su distribución espacial a lo largo de la playa entre los años sin y con iluminación artificial y entre segmentos de playa iluminada y oscura. Se hicieron entrevistas a los residentes para conocer su percepción sobre el impacto de la luz artificial hacia las tortugas marinas. Entre el 2000 y 2005 se registraron 1 217 salidas de tortuga cardón; con 1 056 nidos. El número de nidos con huevos dependió significativamente del año (p=0.035 al igual que el número de nidos totales (p=0.015. En los años previos a la electricidad (2000-2003 se observaron 743 salidas, de las cuales 661 con nido y 374 nidadas confirmadas. En los dos años (2004-2005 con iluminación artificial, se contaron 474 salidas con 395 nidos y 232 nidadas. La proporción de salidas con construcción de nido disminuyó significativamente (p=0.005 en los años con luz eléctrica, pero no varió el éxito de desove (p=0.402. No se encontró diferencia significativa entre el número de salidas por metro de playa en los sectores oscuros y los iluminados (p=0.244, ni entre el número de nidos construidos (p=0.379, ni entre las anidaciones con desove (p=0.516. Tampoco en la proporción de las salidas totales que constituyeron anidaciones (p=0.067 entre los sectores iluminados y oscuros, ni en la proporción de nidos exitosos (p=0.833. El volumen medio de arena por metro de playa fue mayor en La Peña, Cipara y La Remate y menor en Varadero (pImpact of artificial light on nesting in the leatherback turtle Dermochelys coriacea (Testudines: Dermochelyidae at Cipara beach, Venezuela. The number of Leatherback turtle nests and their spatial distribution was compared between years with and without artificial light, and between dark and lighted beach segments, in Cipara Beach, Paria Peninsula, Venezuela. Residents

  6. 高效液相色谱分析鱼毒性藻类海洋卡盾藻溶血毒素%Analyses of Hemolytic Toxin from Ichthyotoxic Phytoplankton Chattonella marina (Hong Kong Strain) by High Performance Liquid Chromatography

    Institute of Scientific and Technical Information of China (English)

    吴霓; 江天久; 江涛

    2012-01-01

    采用高效液相色谱技术(HPLC)分离和分析了海洋卡盾藻(香港株)溶血毒素的甲醇粗提物,通过对比不同流动相、检测波长、等度和梯度洗脱方式,初步建立了分析其溶血毒素的HPLC方法.结果表明,采用梯度洗脱的方法,海洋卡盾藻溶血毒素的粗提物在50 min内取得了较好地分离.色谱条件为C8硅胶柱(4.6 mm× 150 mm,5 μm),流动相为乙腈和水,梯度洗脱(0~10 min,60%→80%乙腈;10~40 min,80% →90%乙腈;40~50 min,90%乙腈);紫外检测器检测波长为205和448nm;流速为0.8 mL/min;柱温为25℃.用兔血红细胞法对各个主要色谱峰进行溶血活性检测显示,海洋卡盾藻(香港株)的溶血毒素至少含有5种成分.光谱分析显示一种成分的紫外吸收高峰在448 nm,一种未完全分离的混合组分的紫外吸收高峰为440和446nm,另外3种成分的紫外吸收高峰为205 nm.%Chattonella marina is a typical fish-killing HAB (Harmful Algae Bloom) species, which could produce hemolytic toxin and result in mass mortality of fishes. In order to understand the transmission and transformation of hemolytic toxin in food chain, high performance liquid chromatography (HPLC) with gradient elution has been used to separate hemolytic toxin extracted from C. marina. Different solvent systems, detection wavelength, isocratic elution and gradient elution for HPLC were compared. The separation is carried out on a C8 column (4. 6 mm×150 mm, 5μm) with acetonitrile/ water as mobile phase, gradient elution (0 -10 min 60%-80% acetonitrile, 10 -40 min 80%-90% acetonitrile, 40- 50 min 90% acetonitrile) with a flow rate of 0. 8 mL/min. The detection wavelength is 205 nm and 448 nm, and the column temperature is 25 °C. Hemolysis bioassay shows that there are at least five components in C. marina (Hong Kong stain). One component had the maximum ultraviolet (UV) absorption at 448 nm, another that was not separated completely had the maxima at 440

  7. EL JUEGO: UNA ESTRATEGIA PARA LA ENSEÑANZA-APRENDIZAJE EN AMBIENTES VIRTUALES DE LOS SUBOFICIALES DE LA ESCUELA DE FORMACIÓN DE INFANTERÍA DE MARINA DE COVEÑAS SUCRE, COLOMBIA

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    Freddy Anderson Cortés otalora

    2016-08-01

    Full Text Available El juego adquiere especial relevancia en la vida de los seres humanos en la medida que ayuda a formar nuestra identidad, personalidad y a fortalecer los lazos sociales aceptados y convencionalizados por la cultura. En este sentido, el propósito de este artículo es analizar como el juego trasciende su significación meramente lúdica y de ocio para convertirse en una herramienta que resulta útil en la enseñanza-aprendizaje tradicional, pero también en los ambientes o entornos virtuales de aprendizaje. De ahí que en la primera parte, el planteamiento del problema del juego en relación con la educación se haga explícito. El artículo también se centra en presentar algunos antecedentes del juego y su valor pragmático en la educación, conectado con la didáctica, la pedagogía y las teorías del juego. Finalmente, el artículo señala la utilidad que adquieren los videojuegos en el proceso de enseñanza-aprendizaje en ambientes virtuales para la formación de los suboficiales de la Escuela de Formación de Infantería de Marina de Coveñas, en el departamento de Sucre (Colombia.

  8. ANALISA ELECTRODE CONSUMABLE TYPE OK AUTROD 12.10 PENGELASAN SUBMERGED ARC WELDING PADA BLOK-BLOK KAPAL DCV 18500 DWT DI PT. JASA MARINA INDAH UNIT II SEMARANG

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    Sukanto Jatmiko

    2012-07-01

    Full Text Available In this globalization era technological advances growed very fast. In shipping industry of development process shipbuilding of principal feedstock to used steel plate, with construction tacking on using welder method.In this research purpose of lifted is know number of requirement (consumable electrode for welder SAW at block-block ship DCV 18500 DWT in PT. Jasa Marina Indah Semarang.At this experiment specimen applied is low carbon steel of type ST 42 with thickness of 12, 13, 14, 17, 19 dan 24 mm. Research is done by the way of making specimen at every plate thickness. Then is done path measurement of length, used electrode length, and weight flux applied at the welder.From result of gauging and data calculation welder at block DB 5(p/c/s, SS5A(p/s, SS 5B(p/s, UD 5C, and TB 102 (p/c/s will be known number of electrodes applied in welder SAW and number of flux used.

  9. Stranded Zostera marina L. vs wrack fauna community interactions on a Baltic sandy beach (Hel, Poland: a short-term pilot study. Part I. Driftline effects of fragmented detritivory, leaching and decay rates

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    Marcin F. Jêdrzejczak

    2002-06-01

    Full Text Available The effects of the beach community structure of macro- and meiofauna on the process of beach wrack decay were investigated by means of a simple field colonisation experiment in a temperate, fine quartz sediment, sandy beach at the end of the Hel Peninsula in Poland. 1260 replicate litterbags of three mesh sizes (12 mm, 0.5 mm, 48 µm containing fresh wrack were used to assess the role of faunal and non-faunal components in the breakdown of stranded Zostera marina. Wrack breakdown was determined during a three-year field study. This paper presents the first part of the results of this field experiment, which refer to the effects of fragmentation detritivory, leaching and decay rates. Material was lost from the bags at a rapid rate, with only 22-32% of the original dry mass remaining after 27 days in the field. This degradation was not directly related to the faunal succession of the eelgrass tissue, which proceeded in two distinct phases throughout the study period. Exclusion of macrofauna from the wrack by the use of finer-mesh litterbags (< 1 mm had no appreciable effect on the rate of dry matter loss. Microbial decay, and abiotic leaching and fragmentation are probably the major causes of seagrass weight loss from the litterbags.

  10. El manejo del área marina y costera protegida Actam Chuleb y los beneficios económicos que genera a los usuarios del municipio de San Felipe, Yucatán, México

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    Wilian de Jesús Aguilar Cordero

    2012-01-01

    Full Text Available El área marina y costera protegida (AMyCP Actam Chuleb se ubica en la costa oriente del estado de Yucatán, en el municipio de San Felipe, donde se realizó el estudio con el fin de caracterizar el manejo de los recursos naturales y estimar los beneficios de uso directo. La metodología se desarrolló en dos etapas; en la primera se identificaron y analizaron las prácticas de manejo y conservación, los bienes y los principales usuarios por medio de entrevistas semiestructuradas y un diagnóstico participativo; en la segunda etapa, se estimó el valor de los beneficios económicos de uso directo y su relevancia en la estructura de actividades económicas de la comunidad por medio una encuesta a los usuarios directos. Los resultados mostraron que no existe un plan de manejo comunitario, sólo se cuenta con una normativa que no es cumplida a cabalidad por la comunidad y que hay una falta de conocimientos, participación y comunicación de los actores sociales para el manejo adecuado y una correcta toma de decisiones. Existe una marcada centralización de poderes, además, los usuarios perciben con mayor facilidad los beneficios de uso directo, generados por la pesca y el turismo, debido a su tangibilidad.

  11. Stress proteins and auxiliary anti-stress compounds in intertidal macroalgae Proteínas de estrés y compuestos anti-estrés auxiliares en algas marinas intermareales

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    Edgardo Cruces

    2012-11-01

    Full Text Available Intertidal macroalgae are exposed to strong variation in the physical environment and thus, diverse anti-stress mechanisms are displayed by these organisms. Stress proteins (also called heat shock proteins, HSPs have been invoked as potential protective mechanism, especially during stressful action of temperature and solar radiation. Therefore, macroalgae have not normally been used as model organisms in studies of these molecules. The present study compiles the existing information from intertidal species in the context of major factors that have been reported to induce them, e.g. temperature, enhanced solar radiation, contaminants, etc. Additionally, in order to address the question whether the expression of these proteins operates in intertidal macroalgae complementarily with other protective mechanisms, a case study of induction of HSPs after exposure to UV radiation and high temperature in two upper littoral species, Ulva sp. and Porphyra columbina, from southern Chile is presented. In parallel, two well-known responses to stress, photoinhibition of photochemical reactions (Fv/Fm and ROS scavenging were measured. The results indicated that, although stress proteins were detected in a time span between 3 and 24 h, the responses were not correlated with photochemical and antioxidative response. Overall, the study outlines a potential role of stress proteins in ecophysiological responses developed to cope mainly with high temperature and UV radiation. However, other rapid metabolic adjustments (e.g. high thermo-tolerance of photosynthesis and efficient ROS scavenging, together with other biomolecules (mycosporines, phenols, polyamines, etc. and morpho-functional adaptations to the intertidal life (e.g. small size, high area/volume ratio are also important.Las macroalgas marinas intermareales están expuestas a extrema variación en las condiciones ambientales y por ello desarrollan una serie de mecanismos anti-estrés. Las proteínas de estr

  12. Efecto de la radiación ultravioleta B en la producción de polifenoles en la microalga marina Chlorella sp. Effect of ultraviolet B radiation on the production of polyphenols in the marine microalga Chlorella sp.

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    Jaime Copia

    2012-03-01

    Full Text Available Las algas marinas son una fuente importante de compuestos antioxidantes (fenoles y polifenoles, generados como mecanismos de defensa frente a factores de estrés (radiación UV, temperatura, herbívora. El objetivo de este trabajo es evaluar la estrategia de adaptación al efecto de la radiación ultravioleta B (RUV-B, 280-315 nm en la microalga marina Chlorella sp. mediante la producción de polifenoles y capacidad antioxidante total. Se expusieron cultivos de Chlorella sp. fueron expuestos a radiación UV-B (470 μW cm-2 por periodo de tiempos ascendentes. Se evaluó la capacidad antioxidante total DPPH, polifenoles totales, clorofila-a y b así como la densidad celular en cultivos expuestos y no expuestos. Los resultados indicaron que la RUV-B genera una disminución de la densidad celular en los cultivos irradiados por primera vez (1ª etapa, existiendo un aumento significativo (P Marine algae are an important source of antioxidant compounds (phenols and polyphenols, generated as defense mechanisms against stress factors (UV radiation, temperature, herbivory. The aim of this study was to evaluate the strategy of adaptation to the effect of ultraviolet B radiation (UV-B, 280-315 nm in the marine microalga Chlorella sp. through, the production of polyphenols and total antioxidant capacity. Chlorella sp. cultures were exposed to UV-B radiation (470 μW cm-2 over increasing time periods. We evaluated the total antioxidant capacity DPPH, total polyphenols, chlorophyll-a and b, and cell densities in exposed and unexposed cultures. The results indicated that UV-B caused a decrease in cell density in cultures irradiated for the first time (1st stage, with a significant increment (P < 0.05, lower than the control in the 2nd and 3rd stages only through the 4th stage (day 7, corresponding to a dose of 16,920 J m-2. The production of total phenols increased significantly (P < 0.05 for the IVth extract with respect to the control, confirming that the

  13. De Las Vegas a Marina D'or. O como llegar desde el New Jornalism norteamericano de Hunter S. Thompson hasta la nueva narrativa española de Robert Juan-Cantavella

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    María Angulo Egea

    2011-12-01

    Full Text Available The north-american trend called 'New Journalism' born in the 60's, was a revolution for the USA traditional Journalism, for its use of literary elements with other ones that belong to the journalistic research. Hunter S. Thompson, author of Fear and loathing in Las Vegas (1971, with his gonzo style, was going to shed new light on the New Journalism proposals, improving the immersión process using drugs until he gets implied personally in his reports and taking all his narrative influences from the 50's beat movement. Almost 35 years later, in El Dorado, Juan-Cantavella makes a paralellism between Las Vegas and the holiday city in the mediterranean coast, Marina D'Or and he develops in this space a novel, where his alter ego, the punk journalist Escargot, plays the lead. Novel, journalism, gonzo, fiction, story, punk, essay, report, 'aportaje', discursive fragmentation, dialogs, internal monologues, descriptions, memorandums, telegrams, emails, press releases, radio news, songs, slogans, all fits to reenact genres, to re-read journalistic and literary traditions and to build something new. This work analyses this process, that goes from the gonzo journalism of Fear and loathing in Las Vegas to the current Spanish narrative of El Dorado. It tries to distinguish the literary resources that the gonzo journalist uses to build his reports and the journalistic tools that nourish Juan-Cantavella's 'punk narrative'. A particular example of literary-journalistic symbiosisLa corriente norteamericana llamada 'Nuevo periodismo', nacida en los años sesenta, supuso para la Periodística tradicional de Estados Unidos toda una revolución por la combinación de elementos literarios con otros propios de la investigación periodística. Hunter S. Thompson, autor de Miedo y asco en las Vegas (1971, con su periodismo gonzo, le iba a dar una vuelta más a la propuesta del New Journalism, llevando al extremo el proceso de inmersión, hasta implicarse personalmente

  14. Parámetros reproductivos y poblacionales de Thais chocolata (Duelos, 1832 (Gastropoda, Thaididae, en la reserva marina La Rinconada, Antofagasta, Chile Reproductive and population parameters of Thais chocolata (Duclos, 1832 (Gastropoda, Thaididae in La Rinconada marine reserve, Antofagasta, Chile

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    Marcela Cantillánez

    2011-11-01

    Full Text Available Para obtener antecedentes reproductivos y poblacionales de Thais chocolata que contribuyan a validar su actual normativa pesquera, se realizó un estudio en el área protegida de la reserva marina La Rinconada, Antofagasta, Chile, entre diciembre 2008 y enero 2010. Los resultados obtenidos indicaron a nivel reproductivo, que el desarrollo gonadal de la población es asincrónico, encontrándose ejemplares en diferentes etapas de maduración durante el año. Los individuos maduros se estratificaron entre 5 y 13 m de profundidad, y gran parte del año formaron agregaciones a 5 m de profundidad. Se determinaron períodos de mayor madurez en julio-agosto, y en noviembre-enero, manifestándose las agregaciones más importantes al final de ellos. Una relación se observó entre meses de mayor madurez y registro de agregaciones, con aquellos de mayor variación intradiaria de temperatura. A nivel poblacional los resultados permitieron estimar una población de 2,3*10(6 ejemplares, donde el 39% se encontró sobre la talla mínima legal (TML = 55 mm. Los parámetros de crecimiento mostraron crecimiento relativamente lento, que podría estar influenciado por la alta variabilidad que presenta la temperatura de fondo en este sector. Mientras que su talla crítica, y la talla de primera madurez sexual poblacional, resultaron ser mayores a la TML. Se determinó la necesidad de revisar la normativa pesquera actual de esta especie, y se demostró la efectividad de las reservas marinas propiciadas por el Estado en la conservación de los recursos marinos.Reproductive and population parameters of Thais chocolata that would contribute to the validation of the current extraction standards were obtained by performing a study in the protected area of La Rinconada Marine Reserve, Antofagasta, Chile, from December 2008 to January 2010. In terms of reproduction, the results revealed asynchronic gonad development in the population, with specimens in different stages of

  15. Captura incidental de tortugas marinas durante El Niño 1997-1998, en el norte del Perú Sea turtles by-catch during El Niño 1997-1998, in northern Perú

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    Javier Castro

    2012-11-01

    Full Text Available Se presenta evidencia del aumento de capturas incidentales de tortugas marinas en el norte del Perú, durante el fenómeno El Niño Oscilación del Sur (ENOS 1997-1998. El área de estudio se ubica frente a Lambayeque, entre 6°20'S y 7°10'S, y desde la costa hasta 35 mn mar afuera. Se analizaron y describieron los aparejos de enmalle por ser los que más interactuaban con estas tortugas, así como las características de las embarcaciones. Se registraron las tortugas capturadas por la flota artesanal entre enero 1996 y diciembre 1998; se identificó las especies capturadas y se analizó la captura por unidad de esfuerzo (CPUE; la información se correlacionó con la temperatura superficial del mar (TSM. Se analizó un total de 265 operaciones de pesca, capturándose un total de 383 tortugas, correspondiendo 80,4% a la tortuga pico de loro (Lepidochelys olivacea, 19,3% a la tortuga verde (Chelonia mydas y 0.2% a la tortuga carey (Eretmochelys imbricata. Se encontró una correlación altamente significativa entre las capturas de tortugas marinas y la TSM con un intervalo de confianza del 99% (Pearson; r = 0,787; σ = 0,000; N = 36. Se recomienda reforzar la colaboración entre entidades públicas y privadas para implementar medidas de manejo adecuadas para la conservación de estas especies amenazadas, sobre todo ante la eventualidad de un fenómeno ENOS.The main purpose of this work is to present evidence of sea turtles by-catch increase in northern Peru during the 1997-1998 El Niño Southern Oscillation (ENSO process. The study area is located off Lambayeque, between 6°20'S and 7°10'S, and from the coastline up to 35 nm offshore. The gillnet artisanal fishery was analyzed and described, since this was the fishing gear which most interact with sea turtles, the boat characteristics were evaluated as well. Sea turtle captures and species identification were registered from January 1996 until December 1998. The catch per unit effort (CPUE was

  16. Aplicación de la Tecnología SIG para la representación de información climática marina en el Atlántico Sur Application Of Gis Technology For The Representation Of Climate Marine Information In The South Atlantic Region

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    Elisa C. Nuré

    2011-06-01

    Full Text Available Este trabajo presenta una aplicación de la tecnología de Sistemas de Información Geográfica (SIG a las bases de datos de información meteorológica marina generadas en función de procedimientos estadísticos recomendados por la Organización Meteorológica Mundial para la elaboración de Resúmenes Climáticos Marinos. Este SIG permite una visualización dinámica de valores extremos y frecuencias en forma de mapas, tablas y gráficos, tanto temporales como espaciales, así como de la distribución de las observaciones meteorológicas marinas en el Océano Atlántico Sudoccidental. La información climática regional marina elaborada utilizando esta tecnología, es de interés para toda ciencia o disciplina relacionada con el medio ambiente y constituye un valioso soporte para la planificación de tareas en el ámbito de la seguridad náutica, tanto para el Servicio de Hidrografía Naval como para otras instituciones que desarrollen actividades afines.This article shows a Geographic Information Systems (GIS application to marine climatic information data bases. These data bases are created following the World Meteorological Organization recommendations for applying statistical procedures to marine observations in order to elaborate Marine Climatic Summaries. This GIS allows a dynamic visualization of maps, tables and graphics showing extreme values and frequencies of meteorological variables in time and space as well as the marine meteorological observations distribution over the South Atlantic Ocean. The regional climatic marine information obtained using this technology, will be a useful tool for environmental related disciplines and, it will be also of valuable support for the safety of naval operations.

  17. Exploiting COSMO-Skymed Data and Multi-Temporal Interferometry for Early Detection of Landslide Hazard: A Case of Slope Failure and Train Derailment Near Marina Di Andora, Italy.

    Science.gov (United States)

    Wasowski, J.; Chiaradia, M.; Bovenga, F.; Nutricato, R.; Nitti, D. O.; Milillo, G.; Guerriero, L.

    2014-12-01

    The improving temporal and spatial resolutions of new generation space-borne X-Band SAR sensors such as COSMO-SkyMed (CSK) constellation, and therefore their better monitoring capabilities, will guarantee increasing and more efficient use of multi-temporal interferometry (MTI) in landslide investigations. Thanks to their finer spatial resolution with respect to C-band data, X-band InSAR applications are very promising also for monitoring smaller landslides and single engineering structures sited on potentially unstable slopes. This work is focused on the detection of precursory signals of an impending slope failure from MTI time series of ground deformations obtained by exploiting 3 m resolution CSK data. We show the case of retrospectively captured pre-failure strains related to the landslide which occurred on January 2014 close to the town of Marina di Andora. The landslide caused the derailment of a train and the interruption of the railway line connecting north-western Italy to France. A dataset of 56 images acquired in STRIPMAP HIMAGE mode by CSK constellation from October 2008 to May 2014 was processed through SPINUA algorithm to derive the ground surface deformation map and the time series of displacement rates for each coherent radar target. We show that a cluster of moving targets coincides with the structures (buildings and terraces) affected by the 2014 landslide. The analysis of the MTI time series further shows that the targets had been moving since 2009, and thus could have provided a forewarning signal about ongoing slope or engineering structure instability. Although temporal landslide prediction remains difficult even via in situ monitoring, the presented case study indicates that MTI relying on high resolution radars such as CSK can provide very useful information for slope hazard mapping and possibly for early warning. Acknowledgments DIF provided contribution to data analysis within the framework of CAR-SLIDE project funded by MIUR (PON01_00536).

  18. Análisis del desarrollo de las competencias básicas en el currículum de la Educación Física en la ESO en la Marina Baixa. Un estudio de caso

    Directory of Open Access Journals (Sweden)

    Julio Barrachina Peris

    2012-12-01

    Full Text Available Con la aprobación de la Ley Orgánica de Educación (LOE, 2006 las competencias básicas cobran un especial protagonismo en la enseñanza. Existe poco conocimiento sobre su desarrollo práctico en el currículum de la educación física en secundaria. El presente artículo resume una investigación realizada en el curso 2010 en los IES de la comarca de La Marina Baixa (Alicante. Enmarcada en la metodología cualitativa, se presenta un estudio de caso sobre una muestra de 28 profesores, con el objetivo de averiguar qué percepción tienen de éstas, qué estrategias emplean para integrarlas en la programación y cuáles son los principales obstáculos con que se encuentran para materializarlas en la práctica. Los datos se analizaron con el programa Aquad 6 y los resultados evidencian que el enfoque por competencias aún está consolidándose entre el profesorado. Las principales estrategias empleadas para su desarrollo se relacionan con la toma de decisiones en el diseño curricular, seguidas por la promoción de la participación y motivación del alumnado. En cuanto a los obstáculos, destacan la escasez y precariedad de los recursos disponibles, la falta de información y formación recibida por el profesorado, así como la escasa implicación de profesores, padres y alumnos.

  19. Assessment of sediment quality in Avicennia marina-dominated embayments of Sydney Estuary: the potential use of pneumatophores (aerial roots) as a bio-indicator of trace metal contamination.

    Science.gov (United States)

    Nath, Bibhash; Birch, Gavin; Chaudhuri, Punarbasu

    2014-02-15

    Currently, coastal intertidal environments are under stress from increased contaminant loads due to urbanization and other anthropogenic disturbances. Mangrove habitats are abundant in tropical and sub-topical intertidal zones and frequently act as a metal bio-filter in estuarine systems. Mangrove reforestation is often considered as one of the management options to protect estuarine-marine habitats. The main objective of the present investigation was to assess the bio-indicator potential of Avicennia marina by determining heavy metal concentrations in pneumatophore (aerial root) tissues and ambient sediments from Sydney Estuary (Australia). We collected mangrove sediments and pneumatophores in fifteen locations covering five major embayments of the estuary for a detailed biogeochemical investigation. Metal concentrations in sediment were mostly above Australian interim sediment quality guidelines (ISQG)-Low and in few instances above ISQG-High values. Enrichment factors (EFs >6, especially of Cu, Pb and Zn) suggest "very severe" modification of sediment in Sydney Estuary in all but one embayment which was mainly due to rapid changes in land use in connection with urbanization. High bio-concentration factors (BCFs) were observed for Cu and Ni in comparison with other metals (i.e., As, Cd, Co, Cr, Pb and Zn). A strong, positive relationship between metals in sediments and pneumatophores suggests potential use of these tissues as a bio-indicator of estuarine contamination and that metals are entering the biotic environment. The study further highlights a positive role of mangroves in sequestering metals from sediments and the water column and thus protecting estuarine environments from pollution.

  20. Study on Wood Anatomical Features and Their Variation of Avicennia marina of Mangrove Forest%红树植物白骨壤木材解剖特性及其变异性研究

    Institute of Scientific and Technical Information of China (English)

    杨天平; 罗建举

    2009-01-01

    对采自广西北海禾沟红树林培育基地的白骨壤(Avicennia marina)木材进行解剖特性和变异研究.结果表明:白骨壤木纤维长度属"甚短级",宽度属于"一级",纤维分子长度、宽度、长宽比、双壁厚、壁腔比、腔径比平均值分别为674.20 μm、15.30 μm、44.16、6.87 μm、0.85、0.55;导管分子长度和宽度分别属于"很短"和 "甚小"级别,导管分子长度、宽度、长宽比、双壁厚、壁腔比平均值分别为174.02 μm、39.89 μm、4.63、4.05 μm、0.12;白骨壤木材的木纤维比量、木射线比量、导管比量、薄壁组织比量平均值分别为71%、7%、22%、1%.不同年轮间纤维和导管的分子长度、宽度、长宽比、双壁厚、壁腔比具有不同程度的变异.

  1. Feasibility Study of Economics and Performance of Solar Photovoltaics at the Former Fort Ord Army Base Site in Marina, California. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites

    Energy Technology Data Exchange (ETDEWEB)

    Stoltenberg, B.; Konz, C.; Mosey, G.

    2013-05-01

    The U.S. Environmental Protection Agency (EPA), in accordance with the RE-Powering America's Land initiative, selected the Former Fort Ord Army Base (FOAB) site in Marina, California, for a feasibility study of renewable energy production. The National Renewable Energy Laboratory (NREL) provided technical assistance for this project. The purpose of this report is to assess the site for a possible photovoltaic (PV) system installation and estimate the cost, performance, and site impacts of different PV options. In addition, the report recommends financing options that could assist in the implementation of a PV system at the site.

  2. Alternativas tecnológicas que permitan la elaboración de productos conformados ricos en ácidos grasos poli-insaturados, a partir de una especie marina grasa sub-explotada (SARACA, Brevoortia aurea)

    OpenAIRE

    Pennisi Forell, Susana Carolina

    2013-01-01

    El presente trabajo de Tesis pretende realizar un aporte a la industria pesquera, en el desarrollo y utilización de especies marinas sin valor comercial. En este caso se busca darle utilidad a la especie conocida como saraca (Brevoortia aurea), la cual se pesca a lo largo del año y principalmente como fauna acompañante durante la zafra de la corvina rubia (Micropogonias furnieri); al no tener valor en el mercado se la descarta. Los volúmenes capturados son considerables por lo que se decidió ...

  3. Antimicrobial and antifouling activities achieved by extracts of seaweeds from Gulf of California, Mexico Actividades antimicrobiana y anti-incrustante obtenidas de los extractos de algas marinas del Golfo de California, México

    Directory of Open Access Journals (Sweden)

    Ruth Noemí Águila-Ramírez

    2012-04-01

    ón mínima inhibitoria (MIC entre 1-10 μg ml-1, frente a las microalgas marinas Rhodosorus magnei, Neorhodella cyanea y Prymnesium calathiferum.

  4. Evaluación de la bioactividad y papel ecológico de los extractos orgánicos crudos de las esponjas marinas Cribrochalina vasculum y Biemna cribaria

    Directory of Open Access Journals (Sweden)

    Arias Hernández Jazmín

    2005-07-01

    Full Text Available La necesidad por obtener una utilidad tangible de los organismos marinos, ha generado un creciente interés por realizar estudios que permitan entender y por lo tanto aprovechar, sus características físicas, biológicas, químicas y ecológicas. La ecología química permite aproximarse a esto,
    por lo tanto, los estudios desarrollados en esta área encierran gran importancia. En el presente estudio se evaluó la actividad de los extractos orgánicos crudos de las esponjas marinas Cribrochalina vasculum y Biemna cribaria, en ensayos de antiepibiosis y disuasión de la alimentación de peces arrecifales generalistas. Estas dos especies mostraron inhibición positiva de la abundancia total, de organismos solitarios, de poliquetos e hidroides; B. cribaria inhibió adicionalmente la abundancia de cianofíceas, cobertura total y cobertura del alga parda. Así mismo, las píldoras preparadas con extracto de C. vasculum no disuadieron a los peces generalistas Stegastes partitus de alimentarse (97,5% de consumo, pero si mostraron rechazo por las píldoras con extracto de B. cribaria (37,5% de consumo. Lo que parece indicar que la esponja B. cribaria está mejor defendida químicamente contra la epibiosis y la depredación, mientras que C. vasculum parece tener un efecto atrayente sobre los peces, por lo que no mostró efectividad en este ensayo. Se propone a B. cribaria como una esponja con posibilidades en la industria de pinturas antiepibióticas, dada su mayor efectividad
    inhibitoria de epibiontes y su baja tasa de lixiviación. Ya que este es un primer acercamiento a la bioactividad de estas dos esponjas, surge la necesidad por continuar estudiando los aspectos ecológicos y químicos de los metabolitos que ellas producen.

  5. 海洋卡盾藻(香港株)溶血活性特征研究%Study on Hemolytic Activity of Chattonella marina Hong Kong Strain

    Institute of Scientific and Technical Information of China (English)

    江涛; 王锐; 吴霓; 江天久

    2011-01-01

    研究了海洋卡盾藻香港株(Chattonella marina,Hong Kong strain,CMHK)在不同生长阶段和营养条件下的溶血活性特征.根据海洋卡盾藻的生长曲线,分别收集对数生长期、稳定期、衰亡期的藻细胞进行溶血毒性的测定;采用不同营养元素结构的培养基对CMHK进行培养,对不同培养条件下的藻细胞进行溶血活性的测定;采用对数生长初期(5 d)、对数期末期(13 d)、稳定期(15 d)和衰亡期(17 d)的CMHK藻液对卤虫进行急性毒性试验.结果表明,培养5 d时对数生长初期单个藻细胞的溶血活性最强,达到1.80×10-7HU/cell,此后随培养时间的增加而逐渐降低;不同生长时期CMHK单位体积藻细胞的溶血活性与生长曲线基本吻合,对数生长末期最强,达到5.32 HU/L;Fe限制虽然能够显著抑制藻细胞的生长,但藻细胞的溶血活性明显增强,单个藻细胞的溶血活性达到8.37×10-7 HU/cell,为正常培养条件下溶血活性值(1.33×10-7 HU/cell)的6.3倍.另外,N限制可使藻细胞的溶血活性值达到6.67×10-7HU/cell;Mn和P限制也能够导致藻细胞溶血活性增强.不同生长期的CMHK对卤虫的毒性试验结果显示,对数生长末期的CMHK藻液对卤虫的毒性作用最强,卤虫暴露在藻密度为4.0×104cells/mL的藻液48 h后,死亡率达到77%,而对数生长初期藻液毒性最弱,48 h卤虫死亡率为20%.%Hemolytic activity of Chattonella marina Hong Kong strain(CMHK) in different growth phase and nutrients structure was studied under laboratory conditions.According to the growth curve of CMHK,cells in culture were collected in logarithmic phase,stationary phase and decline phase,respectively,to determine hemolytic activity.Hemolytic activity of CHHK,which was cultured in different nutrients structure,was also determined.Furthermore,acute toxicity test of CMHK on Artemia salina was performed in early logarithmic phase(5 d),late logarithmic phase(13

  6. Response of antioxidant enzyme activities in Heterosigma akashiwo and Chattonella marina to lose-balance of N/P ratio%赤潮异弯藻和海洋卡盾藻抗氧化酶活性对氮磷比失衡的响应

    Institute of Scientific and Technical Information of China (English)

    王小冬; 王艳

    2012-01-01

    The antioxidanl enzymes of phytoplankton include CAT and SOD, which can alleviate the cellular oxidative damage by acmr-enging ROS species. The responses of activities of CAT, SOD in Heterosigma akashiwo and Chattonella marina to the nutrient limitation were investigated. The results showed that N-depletion depressed the growth and stimulated the activities of CAT and SOD in H. akashiwo and C. marina. The variation in the response of activities of SOD and CAT to the nutrition limitation was species-specific. The activities of SOD and CAT in H. akashiwo when exposed to the P-depletion were higher than N-depletion, however, both N-limi-tation and P-limitation insignificant impacted the activities of SOD and CAT in C. marina. The antioxidant enzymes apparently alleviate the potential damage caused by the nutrition limitation, thus the development and maintenance of harmful algae bloom need the help.%超氧化物歧化酶(SOD)和过氧化氢酶(CAT)是浮游植物抗氧化酶系统的重要组成部分,可有效消除因环境胁迫产生的活性氧自由基对细胞的损伤.本文通过研究氮磷比失衡状态下赤潮异弯藻和海洋卡盾藻的生长及其SOD与CAT酶活性的变化,探索了赤潮物种抗氧化酶对氮磷比失衡的响应.研究表明:N和P限制不仅抑制了赤潮异弯藻和海洋卡盾藻的生长,而且显著提高了SOD与CAT酶活性.酶活性对营养盐失衡的响应随营养盐类型和藻类种类不同而有所差异:赤潮异弯藻对P限制最为敏感,其SOD和CAT酶活性在P限制下显著高于N限制;而N限制和P限制对海洋卡盾藻抗氧化酶活性的影响并无差异.抗氧化酶活性的调控能够有效降低氮磷比失衡对藻类细胞的生理损伤,有利于藻华的发生和规模的维持.

  7. Port: arstid kasutavad narkootikume / Marina Lohk

    Index Scriptorium Estoniae

    Lohk, Marina

    2015-01-01

    Tallinna ülikooli terviseteaduste ja spordi instituudi direktor ja spordibioloog Kristjan Port mainis ETV saates "Vabariigi kodanikud", et töövõime taastamiseks kasutatakse sageli narkootilisi aineid ning seda teevad ka arstid. Kristjan Porti selgitused

  8. Umberto Eco : olemise piire kombates / Marina Grishakova

    Index Scriptorium Estoniae

    Grišakova, Marina, 1961-

    2004-01-01

    Arvustus: Eco, Umberto. Eilse päeva saar / tõlkinud Merike Pau. Tallinn : Eesti Raamat, 2003 ; Eco, Umberto. Baudolino / itaalia keelest tõlkinud [ja järelsõna:] Ülar Ploom. Tallinn : Varrak, 2003

  9. Tshto slutshilos v pervom otseke / Marina Tokareva

    Index Scriptorium Estoniae

    Tokareva, Marina

    2001-01-01

    Teadusliku uurimislaeva "Akademik Mstislav Keldõsh" ekspeditsioon tuvastas juba kuu pärast tuumaallveelaeva "Kursk" hukku katastroofi põhjuse, Venemaa võimud räägivad aga seni kolmestversioonist

  10. Moda kak instrument integratsii / Marina Andrejeva

    Index Scriptorium Estoniae

    Andrejeva, Marina

    2008-01-01

    Moebutiigi Fashion Palace uute kollektsioonide demonstratsioon Tallinna restoranis Gloria. Näidati mudeleid itaalia kaubamärkide P.A.R.O.S.H. ja Ermano Severino ning prantsuse kaubamärgi YSL sügis-talvistest kollektsioonidest 2008/2009. Ehted olid inglise disainerilt Stephen Websterilt. Värvifotod

  11. Umberto Eco : olemise piire kombates / Marina Grishakova

    Index Scriptorium Estoniae

    Grišakova, Marina, 1961-

    2004-01-01

    Arvustus: Eco, Umberto. Eilse päeva saar / tõlkinud Merike Pau. Tallinn : Eesti Raamat, 2003 ; Eco, Umberto. Baudolino / itaalia keelest tõlkinud [ja järelsõna:] Ülar Ploom. Tallinn : Varrak, 2003

  12. A Guide for Marina and Harbor Managers

    Science.gov (United States)

    1991-03-01

    dollars in state and local tax revenues. (David M. Dornbusch and Company, Inc., 1988, pp. 1-2) 3. Importance of the Manager’s Role Recreational boating...Development Planning Study, California Department of Navigation and Ocean Development, October 1973 David M. Dornbusch and Company, Inc., Economic...1982. Available at University of California at Berkeley. 45FL Economic Impact of The Boating Industry In California, David M. Dornbusch and Company

  13. Marina and Rhizophora Mucronata Seedling Establishment

    African Journals Online (AJOL)

    seas in sheltered mud flats, lagoons and river mouths. ... evaporation rate, supply of nutrients, sulfide concentrations ... mangrove areas along the Tanzanian coast were degraded to such ..... in relation to the dynamic features of a mangrove-.

  14. "Uzhe sentjabr. Temnejet rano..." : [luuletused] / Marina Tervonen

    Index Scriptorium Estoniae

    Tervonen, Marina, 1953-

    2003-01-01

    Sisu: "Uzhe sentjabr. Temnejet rano..." ; "Mne budjet rad breventshatõi ujut..." ; "Navstretshu mne zapahnet zemljanikoi..." ; "Slovo za slovom, volna za volnoi..." ; "Poslushai tishinu. Suhhaja jel..." ; "Okontshen dialog dozhdja i morja..." ; "Zdes vjut svoi gnezda strizhi i nadezhdõ..." ; "Bezmolvno den skontshalsja pod zakat..." ; "Zakontshilsja den. No tshto-to na serdtse ostalos..."

  15. Sedamoodi 2005 : moda ot shkolnikov / Marina Poltavtseva

    Index Scriptorium Estoniae

    Poltavtseva, Marina

    2005-01-01

    Tallinna koolide õpilaste moekonkursist "Sedamoodi" räägib konkursi organisaator Tallinna Kanutiaia Noortemaja direktor Mari Velleste. Sedamoodi 2005 eri vanusegruppide võitjad. Rändauhinnaks on Tauno Kangro skulptuur

  16. Seguimiento ambiental para instalaciones de acuicultura marina

    OpenAIRE

    2005-01-01

    Aquaculture, like any other productive activity which uses natural resources, can have an impact on the environment. Both the magnitude and dimension of this influence are related to the type of culture being carried out, and the geographic location of the farm. The present study focuses on the environmental impact associated with aquaculture activities (both inland and off-shore), and identifies the best indicators in the water column and the seabed, in order to further our knowledge of the ...

  17. Biotecnología marina y acuicultura

    Directory of Open Access Journals (Sweden)

    Figueras, Antonio

    2014-08-01

    Full Text Available As a result of overfishing and the escalating cost of fishing, fisheries are unable to provide all the marine products that the world market demands. This shortfall is being met by aquaculture. After Japan and Norway, Spain is one of the world’s leading consumers of fish and seafood. To reduce the losses from disease, increase growth and reproduction rates and juveniles survival... Biotechnology can help achieve these goals. However, there is more than food production in the use of Biotechnology in the marine world. Generation of biodiesel, medicines or new materials have their roots on the application of biotechnology to the marine world.Debido a la situación de los caladeros y al encarecimiento del proceso extractivo, el consumo de pescado y marisco se apoya cada vez más en la acuicultura. España es el tercer país consumidor de pescado del mundo, por detrás tan solo de Japón y Noruega. La biotecnología puede acelerar la consecución de estos objetivos. Sin embargo, no todo es producción de alimento; gracias a la biotecnología asociada al mundo acuático podemos generar combustible, energía, medicamentos y muchas otras aplicaciones que nos permiten valorar cada vez con más la riqueza del mar y su biodiversidad.

  18. Port: arstid kasutavad narkootikume / Marina Lohk

    Index Scriptorium Estoniae

    Lohk, Marina

    2015-01-01

    Tallinna ülikooli terviseteaduste ja spordi instituudi direktor ja spordibioloog Kristjan Port mainis ETV saates "Vabariigi kodanikud", et töövõime taastamiseks kasutatakse sageli narkootilisi aineid ning seda teevad ka arstid. Kristjan Porti selgitused

  19. Moda vernulas v Tallin / Marina Poltavtseva

    Index Scriptorium Estoniae

    Poltavtseva, Marina

    2005-01-01

    Tallinnas Viru Keskuses toimuvast moeürituste sarjast FIBIT. Keskne sündmus on Kuldnõela nominentide Katrin Kuldma, Tiina Talumehe, Thea Pilveti ja Evelin Lille kollektsioonide esitamine. Lisas "Primetshai marku!" juttu moekunstnik Oksana Tanditi uuest kollektsioonist, mida näidatakse ka Viru keskuses

  20. Moda kak instrument integratsii / Marina Andrejeva

    Index Scriptorium Estoniae

    Andrejeva, Marina

    2008-01-01

    Moebutiigi Fashion Palace uute kollektsioonide demonstratsioon Tallinna restoranis Gloria. Näidati mudeleid itaalia kaubamärkide P.A.R.O.S.H. ja Ermano Severino ning prantsuse kaubamärgi YSL sügis-talvistest kollektsioonidest 2008/2009. Ehted olid inglise disainerilt Stephen Websterilt. Värvifotod

  1. Composición química y actividad antioxidante del alga marina roja Bryothamnion triquetrum (S.G.Gmelin Howe Chemical composition and antioxidant activity of the red marine algae Bryothamnion triquetrum (S.G.Gmelin Howe

    Directory of Open Access Journals (Sweden)

    Alexis Vidal

    2006-12-01

    Full Text Available En la actualidad existe un marcado interés por la búsqueda de antioxidantes de fuentes naturales, incluidas las algas marinas. El objetivo de este trabajo fue evaluar la composición química y propiedades antioxidantes del alga Bryothamnion triquetrum. Se estudió la composición centesimal y de minerales, identificación de ácidos grasos y sustancias antioxidantes. La composición centesimal es la siguiente: Proteínas (9,5%, Lípidos (1,3%, Carbohidratos (5,9%, Fibras (10,2% y Cenizas (43%. Los resultados de la actividad antioxidante para las diferentes metodologías empleadas fueron: atrapamiento de radicales DPPH• (38%, 4 mg de liofilizado, beta-Caroteno-Linoleico (12%, 4 mg de liofilizado, actividad atrapadora de radicales O2•- (CI50 0,36 mg/mL, de radicales OH• (CI50 2,11 mg/mL y unión al Fe (CI50 0,37 mg/mL. Las propiedades antioxidantes de esta alga parecen explicarse por la capacidad atrapadora de radicales libres, particularmente relacionada con mecanismos de dismutación de radicales O2•-, inactivación de radicales OH• y quelación de Fe. En trabajos previos se identificaron ácidos cinámicos y fenólicos como moléculas que pudieran explicar la actividad antioxidante, sin embargo adicionalmente se debe considerar un efecto sumatorio y/o sinérgico de otros componentes antioxidantes del extracto, como los descritos en este trabajo, incluidos minerales, carotenoides y vitamina C.An increasing interest has been growing during the past years for the search of natural origin antioxidants, particularly those from marine algae. In this context, the main objective of current research was to evaluate the chemical composition and some antioxidant properties of the aqueous extract of the seaweed Bryothamnion triquetrum. The extracts contains: Proteins (9.5%, Lipids (1.3%, Carbohydrates (5.9%, Fibers (10.2% and Ashes (43%. In current approach, the following results were obtained for the different procedures assessed: DPPH

  2. The co-culture of eelgrass Zostera marina and juvenile sea cucumber,Apostichopus japonicus , in winter%冬季大叶藻与幼参混养效果的模拟研究

    Institute of Scientific and Technical Information of China (English)

    邢坤; 李耕; 杨贵福; 刘海映; 潘玉洲; 郑文军

    2012-01-01

    在实验室条件下对冬季大叶藻Zostera marina与刺参Apostichopus japonicas当年生幼苗的生态混养效果进行了研究,分析了大叶藻对养殖水体中氨氮、硝酸盐、亚硝酸盐、磷酸盐的控制作用以及大叶藻对幼参生长的集聚效果.试验设置大叶藻与幼参混养组、幼参单养组和大叶藻单养空白组,每组设5个重复.试验幼参为2010年培育的秋苗(体长2.90cm±0.04cm,体质量0.69g±0.02g),试验总水体75L,幼参放养密度为1个/L,水温为(15±1)℃,盐度为31~32,光照强度为(271±14)lx,试验共进行30d.结果表明:大叶藻单养组氨氮、硝酸盐、亚硝酸盐、磷酸盐含量最高;幼参摄食大叶藻碎屑,对水体营养盐起到一定的控制作用,混养组各种营养盐含量居中;幼参单养组各种营养盐含量最低.试验期间,底质情况良好,水质对幼参的生长无影响;大叶藻可为幼参提供附着基,对幼参的集聚效果良好,超过80%的幼参栖息在大叶藻叶片上.%The ecological effect of co-culture of eelgrass Zoslera marina and juvenile (body length of 2. 90 cm±0.04 cm; body weigh of 0.69 g±0.02 g) sea cucumber, Apostichopus japonicus, was studied in winter, beyond the growing season of the sea grass, in a laboratory. The sea cucumbers were co-cultured with the eelgrass at a rate of 1 ind. /L in a total water volume of 75 L supplied with sand-filtered and aerated seawater at salinity of 31 -32, (15±1)℃, and fluorescent light of (271±14)lx for 30 days to evaluate the elimination of ammonia, nitrate, nitrite and phosphate and the aggregation of juvenile sea cucumber by the sea weed. The maximal levels of the nutrients were found in monoculture of the eelgrass. The middle levels of the nutrients were found in the co-culture group due to the organic detritus of leaves fed by the sea cucumber juveniles showing a control function on water nutrient. The minimal nutrient levels were found in monoculture of juvenile sea

  3. ESTUDIO QUÍMICO DE LAS FRACCIONES ESTERÓLICAS DE ESPONJAS MARINAS RECOLECTADAS EN EL CARIBE COLOMBIANO CHEMICAL STUDY OF THE ESTEROLIC FRACTIONS OF MARINE SPONGES COLLECTED IN THE CARIBBEAN COLOMBIAN

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    MARY CECILIA MONTAÑO

    2009-12-01

    Full Text Available De las esponjas marinas recolectadas en el Caribe Colombiano Amorphinopsis atlantica, Lissodendoryx carolinensis, Mycale microsigmatosa, Tedania ignis y Niphates erecta se obtuvieron las fracciones esterólicas, las cuales fueron analizadas por cromatografía de gases de alta resolución acoplada a espectrometría de masas. Se identificaron 51 esteroles (12 en A. atlantica, 9 en L. carolinensis, 13 en M. microsigmatosa, 7 en T. ignis y 10 en N. erecta, siendo los esteroles con núcleo Δ5 los que predominan (60.78% de abundancia, seguido de los esteroles con núcleo Δ7 (21.57% y por último los esteroles con núcleo Δ0 (17.64%. Las cadenas lasterales de estos compuestos variaron entre 7 y 11 átomos de carbono, algunas saturadas y otras insaturadas en los carbonos C-22 o C-24(28. Se mostraron 16 cadenas laterales diferentes para los 51 compuestos: 6 con diez átomos de carbono, 4 con ocho átomos de carbono, 4 con nueve átomos de carbonos, 1 con siete átomos de carbono y 1 con once átomos de carbonos; seis de estas cadenas laterales propuestas presentan instauración en el carbono 22 y cuatro de estas cadenas laterales presentan instauración entre los carbonos 24-28. El compuesto 5α-colestan-3β-ol para la esponja A. atlantica fue el compuesto mayoritario en la fracción esterólica con una abundancia de 48.36%, el compuesto 5α-Colestan-3β-ol (Colesterol fue el compuesto mayoritario en las fracciones de las esponjas L. carolinenis, M. microsigmatosa, T. ignis y N. erecta, con una abundancia de 66.81%, 49.92%, 33.19% y 23.64%, respectivamente.Sterolic fractions were obtained from the marine sponges Amorphinopsis atlantica, Lissodendoryx carolinensis, Mycale microsigmatosa, Tedania ignis and Niphates erecta from the Colombian Caribbean coast. These were analyzed in high resolution gas chromatography connected to the mass spectrometry. 51 sterols were identified (12 in the A. atlantica, 9 in the L. carolinensis, 13 in the M. microsigmatosa

  4. A representação da menina e da mulher no conto de fadas moderno: novos destinos em “Além do bastidor” e “A moça tecelã” de Marina Colasanti

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    Livia Maria Rosa Soares

    2015-06-01

    Full Text Available Este trabalho pretende investigar a representação da menina e da mulher na obra infantojuvenil de Marina Colasanti. Para tanto, analisaremos dois contos de fadas da escritora: “Além do bastidor” e “A moça tecelã”, ambos publicados no livro “Antes de virar gigante” (2003. A fundamentação teórica desse capítulo está dimensionada a partir dos estudos realizados, entre outros, por Regina Zilberman, Nelly Novaes Coelho, Leonardo Arroyo, Peter Hunt, Marisa Lajolo, Bruno Bettellheim, Propp, pelas importantes análises em torno do caráter formal, estrutural, histórico, e temático que contribuem para uma visão mais consciente e sistemática das narrativas infantis e juvenis de várias épocas. Além dessas análises, apresentaremos a perspectiva de gênero: como a autora permite reflexões acerca das representações da criança e da mulher. A partir disso, intentamos analisar como as obras selecionadas neste corpus oferecem indícios para se avaliar questões de identidade e representação de gênero (menina e mulher na literatura infantojuvenil atual. Como aporte teórico para essas análises apresentaremos os estudos de Lúcia Zolin, Constância Lima Duarte, Cecil Zinani, Lúcia Castello Branco e Judith Butler, entre outros. Sobretudo, a maneira como Marina Colasanti contribui para uma atualização dos contos de fadas ao mesmo tempo em que dialoga com questões pós-modernas.

  5. GEOMORFOLOGÍA Y ESTRATIGRAFÍA DE LAS FORMACIONES CUATERNARIAS EN LA REGIÓN DEL TRAPECIO AMAZÓNICO COLOMBIANO

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    ALEXIS JARAMILLO JUSTINICO

    2013-12-01

    Full Text Available En la región del trapecio amazónico de Colombia, las secuencias sedimentarias recientes (neo formación dependen en su forma y en su estabilidad del ciclo anual de inundación del río Amazonas. Entre los materiales sedimentarios no afectados por el ciclo actual del río se reconoce a la terraza de Leticia-Tabatinga, de edad estimada entre 8000 y 10000 años A.P., aunque es posible que su modelado se generara en el tardiglaciar (14.000 años AP.. Sus sedimentos están recubiertos por la Formación Iça y es la más alta de las unidades geológicas que aún conservan su morfología plana original. Otros materiales sedimentados se han acumulado como depósitos de canal asociado a drenajes sobre la terraza, con una edad aproximada de alrededor de 8.600 años A.P. Los lagos asociados con cananguchales (palmares dominados por Mauritia flexuosa se reconocen sobre la terraza de Leticia y se encuentran en las áreas donde se observa erosión diferencial, fenómeno que es relativamente reciente de hace aproximadamente 530 años A.P. Entre las unidades geológicas vinculadas con las zonas inundadas por el ciclo anual del río Amazonas, figuran los sistemas lacustres de Zapatero y Yahuarcaca cuya formación se estima entre 240 años A.P. y 150 años A.P., se hallan cercadas por la terraza aluvial La Milagrosa de edad estimada en 131 años A.P., que es cubierta por el agua en épocas de niveles altos de lluvias. También se reconocen geoformas (neoformación de sistemas aluviales meándricos, como barras de arena, canales, canales de drenaje que conectan un río con otro, o un río a un lago o dos trazos de un río. Las geoformas y los materiales de neoformación son jóvenes y tienen demasiada evolución debido al modelado permanente del paisaje que está directamente relacionada con alteraciones procedentes de la intervención humana (cambio climático que influyen directamente en las dinámicas fluviales en el territorio.

  6. Análisis morfológico de escarpas asociadas a una falla de intraplaca con actividad cuaternaria: falla Las lagunas, Córdoba

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    Diego Villalba

    2014-03-01

    Full Text Available El objetivo de la presente contribución es, mediante el análisis cuantitativo de la morfología de escarpas de falla desarrolladas sobre sedimentos cuaternarios, estimar las edades de las reactivaciones prehistóricas e históricas de la falla Las Lagunas. El área de estudio se ubica al SO del departamento Río Cuarto, en el sector pedemontano de la sierra de Comechingones entre las localidades de Achiras y Sampacho, a 33° 18' S y 64° 49´ O, región central de Argentina. El análisis morfológico cuantitativo se realizó mediante la obtención de perfiles topográficos de detalle transversales a la traza de la estructura y la aplicación de curvas de regresión para determinar sus edades. Esto permitió interpretar que las evidencias de deformación mecánica, ruptura en superficie, corresponden a, al menos, cuatro fuertes terremotos asociados a esta falla con ocurrencia en los últimos 10 ka. Con esta información se elaboró una curva de aproximación característica para rupturas en superficie, asociadas a esta falla, de edades menores o iguales a 100 años.

  7. Los depósitos cuaternarios del territorio marino de Cuba

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    Miguel Cabrera-Castellanos

    2011-09-01

    Full Text Available Se sintetizan los resultados investigativos de más de tres décadas acerca de los depósitos cuaternarios del territorio marino de Cuba; estos estudios han revelado la existencia de unidades litoestratigráficas cuaternarias exclusivas del territorio marino (Alegrías, Cayo Romano y Cayo Guillermo, importantes para perfeccionar la estratigrafía del Cuaternario cubano. Algunas unidades litoestratigráficas de origen marino expuestas en tierra firme están ausentes, pues sus depósitos debieron ser removidos durante las transgresiones y regresiones marinas. En los casi 5000 cayos de las plataformas marinas existen depósitos holocénicos innominados de ambientes palustre y marino. El fondo de las plataformas marinas está cubierto parcialmente por depósitos holocénicos innominados, con diferentes granulosidad y composición, que sobreyacen principalmente a la Fm. Jaimanitas. En la zona morfogenética exterior de las plataformas marinas la sedimentación es calcárea, con escasas acumulaciones de arenas y un vigoroso desarrollo de arrecifes coralinos. En la zona morfogenética interior predominan los limos y arcilla calcáreos y calcáreo-terrígenos. En los sectores sin plataforma marina predominan los afloramientos de la Fm. Jaimanitas y brechas bioclásticas del Holoceno. Solo en las desembocaduras de ríos y en las bahías existen acumulaciones de sedimentos marinos y terrígenos de granulometría variada. En general, los depósitos son de poco espesor y tienen una distribución compleja respecto a su granulosidad y composición, lo cual guarda relación con su génesis, el pobre aporte de sedimentos y la variación de la actividad hidrodinámica.

  8. Sintesis icnológica de unidades mesozoicas marinas de la Cuenca Neuquina, nuevos datos y perspectivas Ichnological synthesis of the marine unitsof the Neuquén Basin, new data and future perspectives

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    Pablo J. Pazos

    2009-10-01

    Full Text Available En este trabajo se realiza unasíntesis icnológica de las unidades marinas de la cuenca Neuquina teniendo encuenta el marco estratigráfico de los hallazgos, se presentan nuevos datos y semencionan aquellos aspectos aún no abordados. Los registros más antiguos hansido documentados en el Jurásico y contienen icnotaxones (Lapispira quehan sido descriptos por primera vez para Sudamérica en facies de plataforma.Otros constituyen un muy buen ejemplo de trazas bien preservadas en depósitosdeltaicos jurásicos de la Formación Lajas, con influencia mareal. Allí, elregistro incluye Asterosoma, Asteriacites, Dactyloidites, Diplocraterion,Gyrochorte, Palaeophycus, Polykladichnus, Schaubcilindrichnus, Siphonichnus,Thalassinoides, Teichichnus y trazas poco frecuentes en ambientes marinos someroscomo Helminthorhaphe y rizolitos, entre otras, indicativas de uncomplejo engranaje de facies. Los carbonatos jurásicos de la Formación La Manga contienen tempestitas con Dactyloidites, Gyrochorte, Jamerosonichnitesy Thalassinoides, en Bardas Blancas. El registro icnológico delCretácico Inferior se halla documentado en las Formaciones Mulichinco y Agrio.En la primera los icnofósiles aparecen en la zona de Vega de Escalone ycomprenden Asteriacites, Lockeia, Ophiomorpha, Gyrochorte y posiblementeBergaueria. En la Formación Agrio, tanto en Bajada del Agrio (localidadtipo como en otras localidades dispersas en la cuenca aparecen icnofósilestales como Gyrochorte, Ophiomorpha, Thalassinoides y Teichichnus.Nuevo material proveniente de ambas unidades incluye scratchs subácueos o dearrastre de vertebrados (Characichnos? provenientes de las localidadesde Vega de Escalone y Puerta Curaco. Las trazas de locomoción de artrópodosincluyen formas con apéndices diferenciados (Diplichnites? eindiferenciados. En la Formación Agrio se reconocieron huellas tridáctilas deterópodos en el anticlinal cerro Rayoso, que confirman exposición subaérea enuna zona hasta el

  9. Ecophysiology of Antarctic macroalgae: effects of environmental light conditions on photosynthetic metabolism Ecofisiología de macroalgas marinas antárticas: efectos de las condiciones de luz sobre el metabolismo fotosintético

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    I. GÓMEZ

    2001-06-01

    from temperate and cold-temperate regions. This clearly indicates a major physiological adaptation to the polar environmentLas variación estacional en la duración del día en los ambientes polares es el principal factor ambiental que regula la actividad fotosintética de las algas marinas. El aparato fotosintético de especies de algas pardas tales como Ascoseira mirabilis o Desmarestia menziesii, pertenecientes al grupo denominado "season anticipators", posee la habilidad de usar la radiación solar incidente durante el período de aumento de horas diarias de luz en el invierno tardío y primavera. El desarrollo estacional y la distribución de biomasa en el talo afectan también la actividad fisiológica de estas algas. De este modo, la diferenciación de la capacidad para fotosintetizar (medida como evolución de oxígeno y fijación de carbono a través de la planta representa una adaptación morfo-funcional que optimiza la conversión de energía lumínica en producción primaria. En Desmarestia menziesii, las fases reproductivas tienen diferentes características fotosintéticas. Las micro-fases, gametofitos y estadíos tempranos de los esporofitos están mejor adaptados para usar niveles más bajos de luz que las plantas adultas (esporofitos, básicamente debido a un mayor contenido de pigmentos por unidad de biomasa, mayor eficiencia fotosintética y muy bajos requerimientos de luz para fotosíntesis. Esta estrategia asegura la consumación del ciclo de vida bajo condiciones variables de luminosidad. Las bajas demandas de luz para crecimiento y fotosíntesis no sólo posibilitan la supervivencia de macroalgas en escenarios lumínicos estacionalmente cambiantes, sino que paralelamente les permite expandir sus límites de distribución en profundidad. La inexistencia de diferencias en capacidad fotosintética máxima (Pmax y eficiencia fotosintética (a de poblaciones de una misma especie habitando diferentes profundidades (entre 10 y 30 m sugiere una baja

  10. Histología gonadal y criterios fenotípicos de maduración en las tortugas marinas Chelonia mydas y Eretmochelys imbricata (Testudines: Chelonidae de Cuba

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    Emir Pérez

    2010-03-01

    Full Text Available La madurez gonadal se suele evaluar a través del análisis macroscópico de las gónadas. En las tortugas marinas, las etapas de maduración están asociadas con el tamaño del cuerpo, dependiendo de la población estudiada. Los pescadores clasifican las tortugas que miden más de 65.0cm como maduras sexualmente. Si tienen los caracteres sexuales secundarios se registran como machos en edad reproductora. Nosotros comparáramos el tamaño del cuerpo con las características gonadales macroscópicas y microscópicas de dos tortugas de Cuba. Se obtuvieron dieciocho individuos de C. mydas y veinte de E. imbricata en la pesquería legal del Archipiélago Jardines del Rey (Cuba, entre octubre de 2005 y 2006. En los machos, el estado reproductivo (máxima espermiogénesis se comprobó mediante el análisis histológico de los testículos. En las hembras, la madurez sexual fue identificada por la presencia de folículos vitelogénicos u ovarios corpora. La mayoría de los machos eran inmaduros (C. mydas: 79.0cm; E. imbricata: 73.1±4.9cm, n=3 y carecían de los caracteres sexuales secundarios. Algunos E. imbricata que no tenían un pene desarrollado se encontraban en fases espermatogénicas entre II y IV (p. ej. pubescentes. La mayoría de las hembras eran inmaduras (C. mydas: 79.6±7.7cm, n=17; E. imbricata: 69.0±7.1cm, n=16; p. ej. prepubescente y pubescente. Las hembras prepubescentes tenían ovarios con folículos previtelogénicos de cerca de 1.0mm en un estroma compacto y amarillento. Las hembras pubescentes tenían ovarios con folículos previtelogénicos entre 2.0 y 3.0mm. El estroma fue más distendido e irrigado que en las tortugas pubescentes. El hallazgo de actividad espermatogénica en machos pubescentes indica la asincronía entre el desarrollo de testículos y pene en E. imbricata. El criterio fenotípico actual utilizado por los pescadores no es suficiente para determinar la madurez sexual de estas tortugas. La talla mínima tentativa

  11. Protective effect of flavonoids from Zostera marina against chronic alcohol hepatic injury in mice%大叶藻黄酮对酒精性肝损伤的保护作用

    Institute of Scientific and Technical Information of China (English)

    李静; 张朝辉; 段筱杉; 应锐

    2016-01-01

    为了深入挖掘大叶藻黄酮(ZF)的生物活性,提高大叶藻的利用价值,本实验研究了ZF对酒精性肝损伤的保护作用;实验采用纤维素酶-超声波辅助复合浸提法提取大叶藻中的天然活性物质黄酮类化合物,并采用聚酰胺树脂柱层析法对其进行纯化;研究ZF的体外抗氧化能力;将60只ICR小鼠随机分成6组,通过建立酒精性肝损伤模型,研究ZF对肝损伤的保护作用;结果显示,经纯化后ZF的含量达到80%.体外实验表明ZF对DPPH自由基和羟基自由基有清除能力,具有一定的抗氧化活性;体内实验表明ZF对酒精性肝损伤小鼠的抗氧化能力、脂质代谢能力以及乙醇代谢能力均有影响.ZF各剂量组与模型组相比,血清ALT、AST和γ-GT活性显著降低,肝组织MDA含量显著降低,乙醇代谢酶活性显著提高;ZF中、高剂量组小鼠肝组织GSH-Px和SOD活性显著提高,血脂浓度显著降低.长期过量饮酒可导致小鼠肝脏严重损伤,ZF可以改善小鼠肝组织损伤情况,对酒精性肝损伤起到保护作用,其机制可能与增强机体抗氧化能力、调节脂质代谢和乙醇代谢能力有关.%The aim of this study was to investigate the protective effect and its mechanism in the context of antioxidant of flavonoids from Zostera marina (ZF) on chronic alcohol hepatic injury in mice.This study would provide scientific basis for the prevention of chronic alcohol hepatic injury.ZF were extracted by the combination of cellulose and ultrasonic wave assisted and purified by polyamide resin column chromatography.The scavenging DPPH and hydroxyl free radicals abilities of ZF were studied.To establish chronic alcohol hepatic injury model,60 ICR mice were randomly divided into 6 groups (10 mice per group):normal group (C),model group (M),positive group (P),FL group treated with ZF at dose of 40 mg/kg·d,FM group treated with ZF at dose of 80 mg/kg·d and FH group treated with ZF at dose of 160 mg

  12. 4种红树净光合速率对光和 CO2浓度的响应特征%Responses of Net Photosynthetic Rate on Light Intensity & CO2 Concentration in Leaves of Kandelia candel,Aegiceras corniculatum,Avicennia marina & Bruguiera gymnorrhiza

    Institute of Scientific and Technical Information of China (English)

    黄丽; 王德炉; 谭芳林; 黄石德; 黄雍容

    2013-01-01

    以秋茄、桐花树、白骨壤和木榄等4种红树为研究对象,测定了这4种红树在自然生境中的光合作用对光和CO2的响应曲线,阐述了其光合作用对光和CO2浓度的响应特征。结果表明,不同红树光补偿点(LCP)和光饱和点(LSP)不同,4种红树 LCP为白骨壤(81.95μmol · m -2· s-1)>桐花树(61.84μmol · m -2· s-1)>秋茄(47.09μmol·m -2·s-1)>木榄(39.79μmol·m -2·s-1),LSP为桐花树>秋茄>白骨壤>木榄;不同红树间表观量子效率存在差异,秋茄的表观量子效率最高为0.031,木榄最低为0.012,桐花树(0.027)高于白骨壤(0.017);4种红树植物光合作用的CO2补偿点介于103~152μmolCO2· mol-1,说明4种红树均为C3植物;CO2补偿点从大到小的顺序为木榄>白骨壤>桐花树>秋茄;4种红树羧化效率(CE),最大的为桐花树,其次为秋茄,再次为白骨壤,木榄最低。%Taking four mangrove species (Kandeliacandel ,Aegiceras corniculatum ,Avicennia marina ,& Brugui-era gymnorrhiza) as research objects ,the response curve of net photosynthetic rate in above-mentioned mangroves on light intensity & CO2 concentration in the natural habitat was measured .Response characteristics of their light intensity & CO2 concentration on photosynthesis were described .Result shows that :the light compensation point (LCP)& light saturation point (LSP) of the four mangrove species are different .The LCP of the four mangrove species was that Avicenniamarina(81 .95μmol· m -2 · s-1)> Aegicerascorniculatum(61 .84μmol· m -2 · s-1)>Kandeliacandel(47.09 μmol·m -2·s-1)> Bruguieragymnorrhiza(39.79 μmol·m -2·s-1);theLSPisthat :Aegicerascorniculatum > Kandeliacandel > Avicenniamarina > Bruguieragymnorrhiza;theapparentphoto-synthetic quantum yield (AQY) point of the four mangrove species have differences ;the AQY (CO2 · photon-1 ) from high to low is :Kandeliacandel

  13. El paradigma del acceso libre a la gestión de la información científica en ciencias marinas|The paradigm of open access to scientific information management in the marine sciences |O paradigma do acesso livre à informação científica nas ciências marinhas

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    Enrique Wulff

    2008-09-01

    Full Text Available Resúmen El concepto de acceso abierto a las publicaciones juega un papel clave en la economía de la información. La conciencia de muchos de sus beneficios se realiza a expensas del precio y del número de las fuentes de información. A través de un análisis de los diferentes casos de estudio, se presentan las “lecciones aprendidas” y se deducen diversas conclusiones acerca de las características fundamentales de la política de apoyo y del marco legislativo en que se basan diferentes ideas tributarias de la imagen de mejor práctica que tiene el acceso abierto en ciencias marinas. Palabras clave ciencias marinas, acceso abierto, repositorios Abstract The open access concept to the publications shows a key role in the information economy. The conscience of much of its profits is attained in spite of its price and the number of information sources. Throughout the analysis of different cases of study, the “learned lessons” are presented and diverse conclusions are deduced on the fundamental characteristics of the support policies and law frames which base the tributary ideas of the best practice image that open access offers in marine sciences. Keywords marine sciences, open access, repositories Resumo O conceito de acesso livre às publicações desempenha um papel chave na economia da informação. A consciência de muitos dos seus benefícios é alcançada apesar do preço e do número das fontes de informação. Através de uma análise de diversos estudos de caso, apresentam-se as “lições aprendidas” e deduzem-se conclusões a respeito das características fundamentais de uma política de apoio e do marco legislativo em que se baseiam diferentes idéias tributárias da imagem de melhores práticas que tem o acesso aberto em ciências marinhas. Palavras-chave ciências marinhas, acesso livre, repositórios

  14. Micro-Utopías de lo cotidiano, espacios de encuentro en el Arte Relacional: una aproximación a ciertas acciones de Marina Abramović y Tino Sehgal = Micro utopias of the quotidian, meeting spaces in relational art: an approach to some performances of...

    Directory of Open Access Journals (Sweden)

    Laia Manonelles Moner

    2016-05-01

    Full Text Available En el presente artículo se analiza la concepción de estética relacional de Nicolas Bourriaud, ahondando en la estrecha vinculación de ciertas prácticas artísticas performativas con la participación activa del espectador en la creación de situaciones construidas. A partir de determinadas acciones de Marina Abramović y Tino Sehgal, en las que el público deviene uno de los agentes principales, se bosquejarán los vasos comunicantes entre el creador y la audiencia, entre la experiencia individual y la colectiva. Bajo tales premisas el arte parte de la voluntad de emocionar, conmover, conmocionar, y se establece claramente la conexión entre la esfera pública y la íntima. Dentro de dichos parámetros la obra de arte deviene un intersticio social, un instrumento para esbozar nuevos modos de relación, lo que Bourriaud denomina “utopías de proximidad” o “micro-utopías”. Tales situaciones construidas entienden la creación, en definitiva, como un dispositivo para dar que pensar y fomentar el diálogo y el pensamiento crítico.This paper analyses the concept of relational aesthetics proposed by Nicolas Bourriaud considering the close connections of some performative art practices with the active participation of the spectator in the creation of «constructed situations». I will examine a range on actions of Marina Abramović and Tino Sehgal, in which the audience becomes one of the main agents: stressing the relationship between creator and spectator, between individual and collective experience. Under such premises art shows the will to move, to touch, to affect deeply, connecting the public with the private sphere. Within these parameters, the work of art emerges in the interstices of society as a tool to outline new ways of creating relations, which Bourriaud termed «utopias of proximity» or «micro-utopias». Such situations understand creation as a device to give food for thought and encourage dialogue

  15. Evaluación en ambiente natural, del uso de biopelículas marinas en el asentamiento larval de Argopecten purpuratus (Lamarck, 1819 Evaluation in natural environment of use of marine biofilms, in the larval settlement of Argopecten purpuratus (Lamarck, 1819

    Directory of Open Access Journals (Sweden)

    Marcela Cantillánez

    2010-01-01

    Full Text Available En una granja marina ubicada colindante con el área de reserva marina “La Rinconada” (Antofagasta, Chile, se evaluó el asentamiento larval del pectínido Argopecten purpuratus sobre colectores impregnados con películas multi-específicas, de las diatomeas Navicula sp. y Amphora sp., y de la cepa bacteriana NC1, aisladas desde colectores utilizados en captaciones comerciales de esta especie que presentaron altos índices de fijación, y que bajo condiciones controladas de criadero y laboratorio, han mostrando altos niveles de asentamiento larval. Los resultados obtenidos con el uso de estas biopelículas, sobre colectores instalados en forma paralela a los utilizados por la empresa para la captación de semilla con fines comerciales, no mostraron diferencias significativas entre los diferentes tratamientos probados y el control, respecto a las fijaciones ocurridas en un lapso de 30 días de inmersión. Se discute, debido a los tiempos que demandaron las larvas de la primera cohorte en asentarse sobre los colectores tratados, un posible reemplazo de las biopelículas utilizadas, por otra común en todos ellos y atractiva para el asentamiento de las larvas, como causa de la ausencia de efectos significativos de los tratamientos probados en el medio natural. Se recomienda la necesidad de establecer el tiempo de permanencia, en el ambiente natural, de las biopelículas impregnadas a los colectores en laboratorio.In a commercial farm located near the Marine Reserve “La Rinconada” (Antofagasta, Chile the larval settlement of Argopecten purpuratus on artificial collectors impregnated with multiespecific films of marine diatoms Navicula sp. and Amphora sp. and, bacterial strain NC1 were evaluated, These biofilms were isolates from artificial collector used in commercial activities with highest index of settlement in hatchery and laboratory conditions. The results to use this biofilms in collectors installed in same condition of commercial

  16. Anketa delovoi zhenshtshinõ / Marina Laikjõe ; interv. Marina Andrejeva

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2005-01-01

    Laulasmaa Resort juhatuse esimees võimalustest paremini organiseerida oma tööpäeva, oponendi mõjutamisest, meeste osast oma karjääris, karjäärile kaasaaidanud isiklikest omadustest, hingelise tasakaalu saavutamisest, riietumisstiilist, tööle ja perele pühendatud ajast, seni saavutatust. Lisa: CV

  17. Marina Kaljurand - Eesti hääl Moskvas / Marina Kaljurand ; interv. Margus Saar

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2007-01-01

    Eesti suursaadik Moskvas vastab küsimustele, mis on seotud saatkonna ees toimunud meeleavaldustega, saatkonnas valitsenud olukorraga, ajalehe Argumentõ ja Faktõ pressikonverentsil juhtunuga, suursaadiku puhkuselelubamisega, Eesti-Vene suhetega

  18. Anketa delovoi zhenshtshinõ / Marina Laikjõe ; interv. Marina Andrejeva

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2005-01-01

    Laulasmaa Resort juhatuse esimees võimalustest paremini organiseerida oma tööpäeva, oponendi mõjutamisest, meeste osast oma karjääris, karjäärile kaasaaidanud isiklikest omadustest, hingelise tasakaalu saavutamisest, riietumisstiilist, tööle ja perele pühendatud ajast, seni saavutatust. Lisa: CV

  19. Marina Kaljurand - Eesti hääl Moskvas / Marina Kaljurand ; interv. Margus Saar

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2007-01-01

    Eesti suursaadik Moskvas vastab küsimustele, mis on seotud saatkonna ees toimunud meeleavaldustega, saatkonnas valitsenud olukorraga, ajalehe Argumentõ ja Faktõ pressikonverentsil juhtunuga, suursaadiku puhkuselelubamisega, Eesti-Vene suhetega

  20. Stoichiometric characteristics of mangroves Avicennia marina and Bruguiera sexangula var.rhynochopetala seedlings altered by different tide statuses%不同潮汐淹浸程度下2种红树植物化学计量特征

    Institute of Scientific and Technical Information of China (English)

    刘滨尔; 廖宝文; 李玫; 陈玉军; 管伟

    2014-01-01

    [Objective]Through analysis of stoichiometry and hydrology , the right growing environment of the main species of Bruguiera sexangula var.rhynochopetala and Avicennia marina seedlings and their conservation and restoration in China could be figured out .[Method]The influences of waterlogging time on stoichiometric characteristics of Bruguiera sexangula var.rhynochopetala and Avicennia marina seed-lings in different organs (leaf, stem and root, respectively) were studied using the automatic tidal-simu-lation device in sand culture of greenhouse .The contents of 8 macroelements and 5 microelements were determined in the waterlogging treatments , respectively.[Result and conclusion]The content of K, P, Na, Cl, Mg, Ca, Al, Fe, Mn, B differed significantly in seedlings when waterlogging stress varied .The result of the experiment showed waterlogging had a significant effect on the distribution characteristics of elements in different organs of seedlings , and different species differed in stoichiometric characteristics . The elemental content in leaf was more obvious in waterlogging than that in stem and root of B.sexangula var.rhynochopetala and A.marina seedlings.The result of waterlogging treatment showed the contents of Fe, Al, Mn, Ni, B increased in leaf continually , decreasing in root slightly .The Fe and Al content in 20 h waterlogging about 4.2 and 6.6 times higher than that of 2 h in B.sexangula var.rhynochopetala seedlings.The Fe, Al, Mn, Ni, B in 24 h waterlogging about 4.7, 1.1, 3.5, 4.0 and 1.5 times than that of 2 h in A.marina seedlings.This is possibly one of the most important features of mangrove species in stoichiometry .There is a significant correlation between the change in Mg and Ca in different organs of two species and waterlogging levels .%[目的]通过化学计量学和水文学的分析,摸清主要红树植物尖瓣海莲Bruguiera sexangula var.rhynochopetala和白骨壤Avicennia marina的适生环境,为中国红树林保护和恢