WorldWideScience

Sample records for area marina protegida

  1. Protocolo Indicador Condición Tendencia Bosques de Manglar (ICTBM). Indicadores de monitoreo biológico del Subsistema de Áreas Marinas Protegidas (SAMP).

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    Navarrete Ramírez, Sandra Milena; Rodríguez Rincón, Angélica María

    2014-01-01

    Los indicadores de condición-tendencia (ICT) de los ecosistemas estratégicos marino-costeros hacen parte de los indicadores de estado desarrollados por Invemar para evaluar la situación general de integridad o salud y sus cambios a través del tiempo, a diferentes escalas espaciales, de áreas coralinas someras, bosques de manglar y praderas de pastos marinos presentes en las áreas protegidas del Subsistema de Áreas Marinas Protegidas de Colombia (SAMP), sin que esto implique la imposibilida...

  2. Diseño de una metodología para la gestión sostenible de los recursos en áreas marinas protegidas

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    Garcia Aranda, Cesar; Molina Garcia, Agustin; Gonzalez San Martin, M. Blanca

    2010-01-01

    La nueva Política Marina Integrada de la Unión Europea (UE) tiene como objetivo general la optimización y sostenibilidad de la explotación del mar. En este contexto, la figura de las Áreas Marinas Protegidas (AMPs) se plantea como un valioso instrumento para avanzar en la ordenación y gestión sostenible de los recursos marinos, permitiendo una gran variedad de alternativas en función del objetivo de conservación, el nivel de protección y las diferentes posibilidades de aprovechamiento de...

  3. Valoración de los servicios ecosistémicos asociados a la pesca provistos por las Áreas Marinas Protegidas en Colombia

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    Cuervo, Rafael; Maldonado, Jorge Higinio; Rueda, Mario E.

    2014-01-01

    Las áreas marinas protegidas son reconocidas en la actualidad como una alternativa de conservación de los ecosistemas marinos. Aunque la figura de protección reduce el área disponible para la actividad pesquera, se ha documentado que la misma puede convertirse en una fuente de recursos para la actividad en las zonas aledañas, a través del efecto de rebosamiento. El objetivo de este estudio es valorar los cambios sobre la provisión de recursos pesqueros, resultado del aumento en las áreas mari...

  4. Valoración de los servicios ecosistémicos asociados a la pesca provistos por las Áreas Marinas Protegidas en Colombia.

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    Cuervo Sánchez, Rafael; Higinio Maldonado, Jorge; Rueda H., Mario E.

    2014-01-01

    Las áreas marinas protegidas son reconocidas en la actualidad como una alternativa de conservación de los ecosistemas marinos. Aunque la figura de protección reduce el área disponible para la actividad pesquera, se ha documentado que la misma puede convertirse en una fuente de recursos para la actividad en las zonas aledañas, a través del efecto de rebosamiento. El objetivo de este estudio es valorar los cambios sobre la provisión de recursos pesqueros, resultado del aumento en las áreas mari...

  5. 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.

  6. CRITERIOS PARA UNA AGENDA AMBIENTAL DE AREAS NATURALES PROTEGIDAS COSTERAS EN LA PROVINCIA DE BUENOS AIRES

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    Bertoni, Marcela; López, María José; Testa, Joaquín

    2012-01-01

    Las Áreas Protegidas costeras en la provincia de Buenos Aires tienen dificultades de gestión ambiental y requieren de un ordenamiento vinculado al desarrollo sostenible, donde se reconozcan los vínculos entre los derechos de propiedad, la participación y la acción colectiva en el manejo de los recursos del territorio. Por lo tanto, la institucionalidad del manejo de las reservas provinciales costeras se define en escenarios muy complejos de governanza. Las estrategias de governanza de las Áre...

  7. Gobernanza ambiental, actores sociales y conflictos en las Áreas Naturales Protegidas mexicanas Environmental Governance, Social Actors and Conflicts in Mexican Natural Protected Areas

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    Ludger Brenner

    2010-06-01

    Full Text Available Este artículo analiza los retos que enfrenta la gobernanza ambiental de la Reserva de la Biosfera Sian Ka'an, una de las Áreas Naturales Protegidas más importantes en México. El estudio identifica los actores sociales involucrados, sus intereses, estrategias, poder relativo y acciones. La información pone en claro que el mayor problema que enfrenta la gobernanza ambiental resulta de los intereses y acciones contradictorias que llevan a cabo los diferentes actores sociales.This article analizes the challenges faced by environmental governance of the Sian Ka'an Biosphere Reserve, one of the most important protected natural areas in Mexico. The study focuses on social actors involved, their interests, strategies, relative power and actions. The information obtained shows that the main problem faced by environmental governance actions comes from the various social actors.

  8. Gestión integrada del patrimonio natural y cultural en áreas marinas protegidas (AMP) de México: estudio de casos en el Golfo de México y el Mar Caribe

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    Carrillo, Laura; Ménanteau, Loic

    2012-01-01

    México cuenta con tres Parques Nacionales marinos, otros Parques Nacionales, Reservas de la Biosfera y Reservas Especiales de la Biosfera, que incluyen asimismo espacios marinos. Se hará un breve balance del desarrollo de esta política de protección específica, que está relacionada con actividades de preservación de los ecosistemas acuáticos, de investigación, de recreación, de educación ambiental y de aprovechamiento autorizado de recursos naturales. Una parte de estas áreas marinas posee ta...

  9. Evolução das tipologias e categorias de áreas protegidas no Brasil Evolution of typologies and categories of protected areas in Brazil

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    Rodrigo Medeiros

    2006-06-01

    Full Text Available As áreas protegidas são importante instrumento de conservação dos recursos naturais. Elas começaram a ser territorialmente demarcadas no Brasil nos anos 30 e, desde então, passaram por longo processo de amadurecimento que levou à criação de distintas tipologias e categorias. Este trabalho visa analisar a evolução dessas áreas no Brasil, buscando compreender sua lógica de criação e a inserção nos principais contextos políticos nacionais e internacionais. Discutem-se ainda aspectos relativos à gestão do sistema atual.Protected areas are an important instrument for the conservation of natural resources. They were firstly demarcated in Brazil in the 1930s and, since then, they went through a long process of evolution resulting in the creation of a series of distinct typologies and categories of protected areas. The present study aims to analyze the evolution of these categories of protected areas in Brazil, in order to evaluate the logic behind their creation as well as their insertion in the main national and international political contexts. Aspects related to the management of the actual system are also herein discussed.

  10. Can we expect to protect threatened species in protected areas? A case study of the genus Pinus in Mexico Podemos proteger especies en riesgo en áreas protegidas? Un estudio de caso del genero Pinus en México

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    Jesús Aguirre Gutiérrez

    2010-12-01

    Full Text Available The distribution of 56 Pinus species in Mexico was modelled with MAXENT. The pine species were classified as threatened according to IUCN criteria. Our aim was to ascertain whether or not threatened pine species were adequately represented in protected areas. Almost 70% of the species had less than 10% of their modelled distribution area protected. None of the pine species reached their representation targets. Threatened pine species were less widely distributed, occurred at lower maximum elevations, and were less well represented in protected areas than other pine species. The results suggest that the present system of protected areas in Mexico fails to protect pine species adequately. Conservation targets should be especially directed to species with narrow distributions which occur at low altitudes, such as Pinus. attenuata, P. cembroides subsP. cembroides var. lagunae, P. radiata var. binata, P. rzedowskii, and P. muricata.La distribución de 56 especies del género Pinus en México fue modelada por medio de MAXENT. Nuestro objetivo principal fue investigar si las especies de pino clasificadas por IUCN como amenazadas tienen una representación adecuada en las áreas protegidas de México. Se encontró que casi el 70% de las especies tienen menos del 10% de su distribución modelada protegida. Ninguna de las especies alcanzó el nivel de representación propuesto como adecuado. Se observó que las especies de pino clasificadas como amenazadas tienen un distribución más estrecha, ocurren a menores elevaciones máximas y se encuentran menos representadas en las áreas protegidas en comparación con las otras especies de pino modeladas. Los resultados sugieren que la red actual de áreas protegidas en México no protege adecuadamente el genero Pinus. Proponemos que los esfuerzos de conservación deben estar dirigidos especialmente a especies con distribución reducida y que se encuentran principalmente distribuidas a bajas altitudes, como por

  11. Gobernanza ambiental, actores sociales y conflictos en las Áreas Naturales Protegidas mexicanas Environmental Governance, Social Actors and Conflicts in Mexican Natural Protected Areas

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    Ludger Brenner

    2010-01-01

    Este artículo analiza los retos que enfrenta la gobernanza ambiental de la Reserva de la Biosfera Sian Ka'an, una de las Áreas Naturales Protegidas más importantes en México. El estudio identifica los actores sociales involucrados, sus intereses, estrategias, poder relativo y acciones. La información pone en claro que el mayor problema que enfrenta la gobernanza ambiental resulta de los intereses y acciones contradictorias que llevan a cabo los diferentes actores sociales.This article analize...

  12. Marina Facilities

    OpenAIRE

    2014-01-01

    The CIRPAS main facility and headquarters are at Marina Municipal Airport (formerly Fritchie Field, Fort Ord) in Marina, California. CIRPAS has a 30,000 sq. ft. maintenance hanger there, which houses staff offices, an instrument and calibration laboratory, maintenance and payload integration shops, conference rooms, and flight planning and operations control center.

  13. Environmental management of works in pipelines at natural protected areas; Gestao ambiental em obras de faixas de dutos nas areas naturais protegidas

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    Raul, Vanderlei Lourenco; Alves, Anibal Jose Constantino; Martini, Andrea Dietrich; Lima, Silvia Ferreira de; Campos, Cleber Lucio dos Santos; Ozorio, Tarcisio Faria; Melo Neto, Joao Evangelista de [PETROBRAS Transporte S. A. (TRANSPETRO), Rio de Janeiro, RJ (Brazil)

    2008-07-01

    The TRANSPETRO pipeway in the State of Sao Paulo crosses different scenarios, including Permanent Preservation Areas and Conservation Units, as the Parque Estadual da Serra do Mar - PESM, which contains the most extensive Mata Atlantica fragment, with more than 315,000 hectares. The rigor of environmental organisms imposes a number of extra conditions to critical points to be considered in activities with interference in the conservation unit. It was studied the case of thirty two kilometer pipeline substitution of OSBAT pipeway, in the Sao Sebastiao city, in the area covered by the PESM, to know the effective of environmental controls adopted. It was able to analyze the results about the application of management instruments at different levels, including independent external audit, audit of the Company that realized the work activities and audit of the own specialized people of TRANSPETRO and PETROBRAS. (author)

  14. Planificación participativa en áreas protegidas con comunidades indígenas: el caso del Parque Nacional Chiloé Participative planning in protected areas with indigenous communities: the case of Chiloé National Park

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    JUAN V OLTREMARI

    2003-08-01

    Full Text Available Es frecuente que el manejo de áreas protegidas y las aspiraciones de las comunidades indígenas vinculadas a estas áreas sean motivo de diversos conflictos, donde las herramientas de planificación participativa han colaborado de manera importante a resolverlos. En este estudio se analiza el caso del Parque Nacional Chiloé, empleando ese tipo de metodologías, aplicadas a una comunidad Huilliche aledaña al Parque, con conflictos por derechos de propiedad de la tierra. Se realizaron tres talleres participativos en la comunidad, uno con niños escolares para analizar su percepción sobre esta realidad y dos con adultos para la identificación de conflictos, sus causas y consecuencias, y para formular una idea de proyecto en beneficio de la comunidad y del Parque en terrenos propios y compartidos de una zona amortiguadora. El principal problema identificado por la comunidad fue la falta de un plan acordado que articule el desarrollo de la comunidad y del Parque. Aún se percibe un desconocimiento de los objetivos del área protegida y del beneficio que les reporta la existencia de una zona amortiguadora. Sin embargo, existe la voluntad por parte de CONAF y de la comunidad para continuar con un plan participativo que considere ambos intereses.The management of protected areas and the aspirations of indigenous local communities associated with these areas are frequently in conflict. Tools of participatory planning have been successfully used to collaborate in alleviating these conflicts. In this study, the case of the Chiloé National Park is analyzed using this type of approach. It is applied to a Huilliche community, who live at the boundary of the park, and involves problems of land tenure. Three participatory workshops were carried out with the community, one with children attending primary school to analyze their perception of the problem and two with adults to identify conflicts and their causes and consequences. The benefits of the park to

  15. Impact of climatic change in forests and natural protected areas of Mexico; Impacto del cambio climatico en los bosques y areas naturales protegidas de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Villers-Ruiz, L.; Trejo-Vazquez, I. [Universidad Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Geografia

    1998-01-01

    The vulnerability of Mexico`s forest ecosystems to climate change was assessed according to the results of two General Circulating Models (GCMs): CCCM and GFDL-R30. Holdridge`s life zones classification was used for the analysis. The paper shows the climatic differences for each model and for different region of Mexico. Climate scenarios were compared to current climate so as to recognise climate change regions for each model. Of the 18 life zones reported for the country, the most affected ones would be the temperate cold and warm forests, tending to disappear. On the contrary, tropical dry, very dry and thorn forests with warm affinities tend to widen their current surfaces, according to the CCCMN model. The GFDL-R30 model foresees increases in the distribution of tropical, humid and wet forests, which would be favored by the increase in rainfall, giving place to tropical rain forests, currently non-existent in the country. Of the 33 natural protected areas used for this study, 24 show changes in their life zones, the most affected ones are those found in the northern and occidental regions of the country. The most affected forest industries would be those located in the Sierra Madre Occidental, in the states of Durango and Chihuahua, and to the occidental part of the country, the industries found in Michoacan and Jalisco. 36 refs., 5 figs., 4 tabs.

  16. Conducta Sexual Protegida en Adolescentes Mexicanos

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    Citlalli Pérez de la Barrera; Susan Pick

    2006-01-01

    El objetivo de este estudio fue identificar predictores psicosociales de conducta sexual protegida en adolescentes. La muestra estuvo constituida por 113 hombres y 65 mujeres mexicanos estudiantes de bachillerato, entre los 14-20 años de edad. Se aplicaron una serie de instrumentos a saber: conocimientos y creencias sobre sexualidad, habilidades para la toma de decisiones, comunicación asertiva y conducta sexual protegida. Los resultados mostraron que la habilidad de comunicación asertiva es ...

  17. Parlamento, presidencialismo y democracia protegida

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    Óscar Godoy Arcaya

    2003-01-01

    Full Text Available Resumen El autor analiza el Congreso Nacional como poder legislativo, fiscalizador y representativo, en el contexto del régimen presidencial reforzado o ultra-presidencial chileno y la democracia "protegida" instaurada por el gobierno autoritario. Los aspectos más relevantes del trabajo son los siguientes: descripción de la composición, estructura y poderes formales y reales del Congreso; análisis de las relaciones entre la Presidencia y el parlamento, con un especial énfasis en las fortalezas de la primera como co-legislador y las debilidades del segundo como fiscalizador; evaluación de la inclusión en el parlamento de las Fuerzas Armadas como agentes del proceso de decisiones políticas, y su función de garantes y tutores de la democracia; y, finalmente, balance de los problemas que encara el Congreso Nacional, tanto por sus carencias como poder fiscalizador como por su déficit como órgano representativo. En este trabajo también se pretende hacer una breve síntesis de algunos fenómenos que gravitan en la vida del parlamento, tales como el estado del sistema de partidos políticos, la despolitización de la sociedad civil y la imagen pública del Congreso.Abstract The author analyzes the Chilean National Congress in the context of an extreme-presidential regime and the "protected" democracy installed by the authoritarian regime. The article runs as follow: a description of the composition, structures, and formal and real powers of the Congress; an analysis of the relations between the Presidency and the parliament, with a special emphasis in the strengths of the presidency as co-legislator and the weaknesses of Congress in regard with its accountability powers, an evaluation of the inclusion in the parliament of the Armed Forces as an agent on the process of political decisions, and their function of guarantors and tutors of the democracy. This work also tries to make a brief synthesis of some phenomena that weigh on the life of

  18. Conservation value of a natural protected area in the state of Puebla, Mexico Valor de conservación de una área natural protegida en Puebla, México

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    Ernesto Iván Badano

    2012-09-01

    Full Text Available Mexico has several natural protected areas (NPAs managed by state administrations. However, the aims these NPAs are more closely related to local political contexts than to their importance as reservoirs of biodiversity. In this study, we assessed the conservation value of the park Flor del Bosque, in the state of Puebla. Since this park contains both, well-preserved and human-disturbed habitats, we compared the diversity of plants and birds between these habitat types. Later, to assess its conservation value, the total diversity of the park was compared with that from an external, unprotected site with similar vegetation structure. In the park, the diversity of both groups of organisms was higher at well-preserved rather than at disturbed habitats. Furthermore, the analyses indicated that the entire diversity of the park is substantially higher than that of the external site. Thus, we suggest that these type of studies should be promoted by the state governments to determine the conservation value of their NPAs and, therefore aid in the development of adequate management programs for these sites.México tiene varias áreas naturales protegidas (ANPs que dependen de los gobiernos estatales. Sin embargo, los objetivos de estas ANPs están más estrechamente vinculados a los contextos políticos locales que a su importancia como reservorios de la biodiversidad. En este estudio evaluamos el valor de conservación del parque ecológico Flor del Bosque, en el estado de Puebla. Debido a que el parque tiene hábitats bien conservados y antropogénicamente perturbados, comparamos la diversidad de plantas y aves entre esos tipos de hábitats. Después, para evaluar el valor de conservación, la diversidad total del parque fue comparada con la de un sitio externo, no protegido, con estructura similar en cuanto al tipo de vegetación. En el parque, la diversidad de plantas y aves fue más alta en los hábitats bien conservados que en los perturbados. Adem

  19. Composición y diversidad de hormigas (Hymenoptera: Formicidae en algunas áreas protegidas del valle de Aburrá Composition and diversity of ants (Hymenoptera: Formicidae in some protected areas of the “Valle de Aburra”

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    Elmer Toro A

    2006-12-01

    Full Text Available Se estudiaron las comunidades de hormigas en tres áreas protegidas del Valle de Aburrá (Departamento de Antioquia – Colombia. En cada sitio se instalaron 50 estaciones de muestreo en dos épocas; se colectaron hormigas usando trampas de caída, sacos mini-Winkler y captura manual. Adicionalmente, se instalaron diez estaciones en el jardín botánico Joaquín Antonio Uribe de Medellín, el cual aportó ocho especies exclusivas. Se identificaron 96 morfoespecies pertenecientes a 33 géneros, 18 tribus y seis subfamilias. Myrmicinae fue la subfamilia dominante del paisaje. Los estimadores no paramétricos de riqueza ICE y Jackknife1 produjeron estimaciones de 105 y 107 especies respectivamente para las tres áreas juntas y sólo en una de ellas presentaron diferencia significativa en los valores de riqueza estimada. Las curvas acumuladas de especies mostraron que la metodología de muestreo fue eficaz para colectar la mayoría de las especies del estrato rasante. La distribución de frecuencias se ajustó a un modelo logarítmico y se encontraron valores de equidad relativamente altos, debido a la presencia de un gran número de especies con sólo un individuo. Los sitios comparten la mayor parte de la mirmecofauna, por consiguiente cuentan con una organización funcional similar. Para la escala local, se observó una disminución de la diversidad con el incremento en la altitud. Cada una de las áreas aportó especies exclusivas a la diversidad total de Formicidae; lo cual sugiere que deben ser conservadas para mantener la biodiversidad local.Ant communities were studied in three protected areas of the “Valle de Aburra” (Department of Antioquia-Colombia. 50 sampling stations were settled in each of these areas through two months (march 2000 and may 2001. Ants were collected using pitfall traps, mini-Winkler sacks and manual capture. Additionally, ten stations were settled in the botanical garden Joaquín Antonio Uribe of Medellín, this

  20. Composición y diversidad de hormigas (Hymenoptera: Formicidae) en algunas áreas protegidas del valle de Aburrá Composition and diversity of ants (Hymenoptera: Formicidae) in some protected areas of the “Valle de Aburra”

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    Elmer Toro A; Oscar Efraín Ortega

    2006-01-01

    Se estudiaron las comunidades de hormigas en tres áreas protegidas del Valle de Aburrá (Departamento de Antioquia – Colombia). En cada sitio se instalaron 50 estaciones de muestreo en dos épocas; se colectaron hormigas usando trampas de caída, sacos mini-Winkler y captura manual. Adicionalmente, se instalaron diez estaciones en el jardín botánico Joaquín Antonio Uribe de Medellín, el cual aportó ocho especies exclusivas. Se identificaron 96 morfoespecies pertenecientes a 33 géneros, 18 ...

  1. Distribución y representatividad de las especies del género Crotalus en las áreas naturales protegidas de México Distribution and representation of Crotalus species within the natural protected areas of Mexico

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    Dinorah Malinaly Paredes-García; Aurelio Ramírez-Bautista; Miguel Angel Martínez-Morales

    2011-01-01

    Se realizó un análisis sistemático de la distribución de las especies del género Crotalus en México para conocer los sitios de mayor concentración y evaluar su nivel de representatividad dentro del esquema federal de áreas naturales protegidas (ANP). A partir de registros georreferenciados se construyeron los modelos de distribución potencial de las especies con un número suficiente de registros, empleando los algoritmos GARP y MaxEnt. Con estos mapas de distribución se dedujeron las áreas de...

  2. Distribución y representatividad de las especies del género Crotalus en las áreas naturales protegidas de México Distribution and representation of Crotalus species within the natural protected areas of Mexico

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    Dinorah Malinaly Paredes-García

    2011-06-01

    Full Text Available Se realizó un análisis sistemático de la distribución de las especies del género Crotalus en México para conocer los sitios de mayor concentración y evaluar su nivel de representatividad dentro del esquema federal de áreas naturales protegidas (ANP. A partir de registros georreferenciados se construyeron los modelos de distribución potencial de las especies con un número suficiente de registros, empleando los algoritmos GARP y MaxEnt. Con estos mapas de distribución se dedujeron las áreas de mayor concentración de especies y se estimó su presencia en las ANP. La mayor riqueza de especies se concentra en las regiones de la sierra Madre Occidental, el noroeste del Altiplano Mexicano, la porción norte de la sierra Madre Oriental y el extremo oeste de la Faja Volcánica Transmexicana. Se estima que el 84.4% de las ANP incluyen al menos 1 especie de Crotalus y que el 88.2% de las especies que se distribuyen en México están presentes al menos dentro de 1 ANP. En este contexto de alta representatividad, el plantear la incorporación de ANP adicionales para la protección y conservación de crotalinos se dificulta, por lo que debe optarse por estrategias alternativas, tales como educación ambiental, conservación de hábitats mediante el uso sustentable de recursos, y el manejo y reproducción en cautiverio de especies en riesgo; además, se debe fomentar la investigación y el monitoreo de poblaciones.We performed a systematic analysis of the distribution of the Crotalus species in Mexico to depict the places of high species concentration and to evaluate its representation within the federal natural protected areas (NPAs scheme. Based on geo-referenced records, we built distribution models for species with enough records using the GARP and MaxEnt algorithms. We then deduced areas of high species concentration and estimated its presence in the NPAs. The regions with the highest species richness are the Sierra Madre Occidental, the

  3. Recent invasion of buffel grass (Cenchrus ciliaris of a natural protected area from the southern Sonoran Desert Invasión reciente de zacate buffel (Cenchrus ciliaris en un área natural protegida del desierto sonorense

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    Erick De la Barrera

    2008-12-01

    Full Text Available The Centro Ecológico de Sonora is a natural protected area where the natural vegetation remained undisturbed at least until 1997. Since then, Cenchrus ciliaris has become a prominent element of the vegetation because of disturbance. Climate, soil properties, population structure and biological activity for C. ciliaris were studied to gain understanding of the ecological mechanisms that favored the invasion by this exotic grass. Mean air temperature and annual rainfall were 24.8°C and 302 mm. The soil was a loamy-sand that was poor in most nutrients, but particularly rich in phosphorus. Pennisetum ciliare was the most abundant species at the Centro Ecológico, representing over one third of total plant ground cover. Basal area for individual plants ranged from less than 1 cm² to almost 1 m². Living leaves per plant increased with precipitation, peaking at 199 leaves in March 2005, and no living leaves were found after 103 days without rain. The environmental conditions prevalent at Centro Ecológico are very favorable for C. ciliaris, whose establishment was apparently triggered by a major disturbance caused by the development of housing projects.El Centro Ecológico de Sonora es un área natural protegida donde la vegetación autóctona permaneció sin disturbios por lo menos hasta 1997. Desde entonces, Cenchrus ciliaris se ha convertido en un elemento prominente de la vegetación. Se estudiaron el clima, las propiedades del suelo, la estructura de la población y la actividad biológica de C. ciliaris, como una aproximación al entendimiento de los mecanismos ecológicos que favorecieron la invasión por este pasto exótico. La temperatura media del aire y la precipitación anual fueron de 24.8 °C y 302 mm. El suelo fue una arena limosa pobre en minerales, pero particularmente rica en fósforo. Cenchrus ciliaris fue la especie herbácea más abundante en el Centro Ecológico, representando más de un tercio de la cobertura vegetal. El

  4. ECO-PEDAGOGY, A WAY TO PRESERVE PROTECTED AREAS AND THE COLOMBIAN COFFEE CULTURAL LANDSCAPE / ECOPEDAGOGÍA PARA PRESERVAR LAS ÁREAS PROTEGIDAS Y EL PAISAJE CULTURAL CAFETERO

    Directory of Open Access Journals (Sweden)

    DIANA MAGALLY CORREA VALERO

    2014-10-01

    Full Text Available This article presents progress made in research regarding environmental educational theory and teaching methods as well as environmental law. Based on a specific case study, the possibility of putting into practice the concepts of eco-pedagogy, eco-citizenship and ecological societies, as well as interdisciplinarity, interculturality and knowledge dialogues, is analyzed. The methods used are social-legal research, participatory action research and the ethnographic method. The result describes the active role of the environmental law students from Universidad de Caldas, and the indigenous communities and the rural populations in the Colombian Coffee Triangle in the development of such concepts and methods during the period comprised between February 2007 and December 2010, as a contribution to the strengthening of citizen participation and the defense of the rights of local communities. The article concludes that from education and environmental law it would be possible to contribute to the preservation of the biological and cultural diversity of the Coffee Triangle, especially in the protected areas and the indigenous reservations in such a way that at a long term, networks and public policies must have to be created to strengthen environmental governance in the territory. RESUMEN: El siguiente artículo presenta avances de investigación en torno a la teoría y los métodos de educación y derecho ambiental. A partir de un estudio de caso concreto, se analizará la posibilidad de poner en práctica los conceptos de ecopedagogía, ecociudadanía y sociedad ecológica, así como interdisciplinariedad, interculturalidad y diálogo de saberes. Los métodos utilizados son: investigación sociojurídica2 , investigación acción participativa3 y método etnográfico4 . El resultado describe papel activo de los estudiantes de derecho ambiental de la Universidad de Caldas, y las comunidades indígenas y campesinas del Triángulo del Café en Colombia

  5. ¿Qué tan bien representados están los mamíferos mexicanos en la red federal de áreas naturales protegidas del país? How well represented are Mexican mammals in the natural protected area network?

    Directory of Open Access Journals (Sweden)

    Luis-Bernardo Vázquez

    2009-04-01

    Full Text Available Se evaluaron la eficiencia y eficacia de la red de áreas naturales protegidas (ANPs federales de México para representar la riqueza de especies de mamíferos terrestres. Para determinar el porcentaje de especies no protegidas, se sobrepuso una gradilla de celdas de 0.5° x 0.5° con datos de riqueza de especies en el mapa de las ANPs y se comparó con conjuntos equivalentes de áreas seleccionados al azar. Mediante optimización se estimó cuántas celdas adicionales complementarían a las ANPs y cuántas áreas bastarían para proteger todas las especies al menos una vez. Los resultados indican que cerca de la quinta parte del total de especies, un tercio de las endémicas y un tercio de las vulnerables, no están protegidas. En conjuntos de celdas elegidos al azar se representan más especies que en el total de celdas cubiertas por ANPs. En la península de Baja California, la vertiente del Pacífico, la sierra Madre Occidental y el sur del país (Oaxaca se concentra el mayor número de especies no protegidas. Para complementar las celdas con ANPs se requieren 25 celdas adicionales y bastarían conjuntos óptimos de 38 celdas para representar todas las especies al menos una vez. Nuestros resultados pueden ayudar a mejorar la selección de nuevas ANPs para ganar en eficacia y eficiencia al representar a las especies de mamíferos aún no protegidas.We evaluated the efficacy and efficiency of the federal network of natural protected areas (NPAs to represent the species richness of terrestrial mammals. We overlapped a 0.5° x 0.5° grid with data on species richness with the map of NPAs, to determine the proportion of unprotected species. We compared this with equivalent sets of cells, chosen randomly. In addition, through optimization we determined how many additional cells will complement the NPAs and how many cells will represent all species at least once. We found that nearly 1/5 of the total species, 1/3 of the endemics and 1/3 of the

  6. 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

  7. The Dikkowita Marina Project

    NARCIS (Netherlands)

    Broekman, E.G.; Buckers, M.D.; Rest, M.H.; Ligthart, D.

    2016-01-01

    The large fishery harbour of Dikkowita faces some problems with respect to revenues and conflicts between the users. To create a higher revenue and to avoid these conflicts, a marina will be implemented. This report discusses the different aspects implementing a marina in the harbour of Dikkowita.

  8. A Method for Calculating the Area of Zostera marina Leaves from Digital Images with Noise Induced by Humidity Content

    Directory of Open Access Journals (Sweden)

    Cecilia Leal-Ramirez

    2014-01-01

    Full Text Available Despite the ecological importance of eelgrass, nowadays anthropogenic influences have produced deleterious effects in many meadows worldwide. Transplantation plots are commonly used as a feasible remediation scheme. The characterization of eelgrass biomass and its dynamics is an important input for the assessment of the overall status of both natural and transplanted populations. Particularly, in restoration plots it is desirable to obtain nondestructive assessments of these variables. Allometric models allow the expression of above ground biomass and productivity of eelgrass in terms of leaf area, which provides cost effective and nondestructive assessments. Leaf area in eelgrass can be conveniently obtained by the product of associated length and width. Although these variables can be directly measured on most sampled leaves, digital image methods could be adapted in order to simplify measurements. Nonetheless, since width to length ratios in eelgrass leaves could be even negligible, noise induced by leaf humidity content could produce misidentification of pixels along the peripheral contour of leaves images. In this paper, we present a procedure aimed to produce consistent estimations of eelgrass leaf area in the presence of the aforementioned noise effects. Our results show that digital image procedures can provide reliable, nondestructive estimations of eelgrass leaf area.

  9. ¿Qué tan bien representados están los mamíferos mexicanos en la red federal de áreas naturales protegidas del país? How well represented are Mexican mammals in the natural protected area network?

    OpenAIRE

    Luis-Bernardo Vázquez; David Valenzuela-Galván

    2009-01-01

    Se evaluaron la eficiencia y eficacia de la red de áreas naturales protegidas (ANPs) federales de México para representar la riqueza de especies de mamíferos terrestres. Para determinar el porcentaje de especies no protegidas, se sobrepuso una gradilla de celdas de 0.5° x 0.5° con datos de riqueza de especies en el mapa de las ANPs y se comparó con conjuntos equivalentes de áreas seleccionados al azar. Mediante optimización se estimó cuántas celdas adicionales complementarían a las ANPs y cuá...

  10. Saint Marina: the protectress of nephrology.

    Science.gov (United States)

    Eftychiadis, A C; Marketos, S G

    1999-01-01

    Saint virgin and martyr Marina (Margarita) of Antioch in Pisidia (255-270) is recognized as the patron saint of kidney sufferers and the protectress of nephrology. Beginning in the 13th century she heals in particular patients suffering from nephropathies, pregnant women having a difficult childbirth, barren women and sickly children. She protects the patients from every side effect and complication. Saint Marina is represented in hagiography as a victor, defeating the dragon satan, holding a hammer or a cross and wearing a belt around her back in the area of kidneys. According to writers, artists and sculptors the belt is the perceivable means of Saint Marina for the miraculous recovery from and healing of kidney diseases. Therefore, kidney sufferers and pregnant women put belts upon her relics for blessing and then wore them. From the Middle Ages and Renaissance and up to the contemporary period Saint Marina (Margarita) was considered the patron saint of kidney sufferers. Justifiably she is recognized by the modern medical world as the protectress of nephrology. PMID:10213803

  11. El Control Biológico de Malezas, una alternativa factible para la lucha contra las plantas invasoras exóticas en Áreas Protegidas de la Argentina Biological Control of Weeds as a Feasible Option against Invasive Exotic Plants in Protected Natural Areas of Argentina

    Directory of Open Access Journals (Sweden)

    Hugo A. Cordo

    2004-07-01

    Full Text Available Las áreas protegidas cumplen una función esencial en la preservación de la biodiversidad de la fauna y flora del país. Las áreas naturales, amenazadas en forma permanente por la actividad humana, deben ser protegidas en cantidad y calidad para preservar dentro de lo posible los recursos naturales y el caudal genético allí presente. En la mayoría de nuestros parques nacionales, reservas naturales, etc., las malezas exóticas constituyen una amenaza severa para la vegetación nativa debido a su gran poder invasor. El control biológico es una herramienta que debe considerarse con seriedad, a pesar de la dificultad que puede presentar a priori su implementación. Para algunas malezas exóticas de gran poder invasor y dispersión, el control biológico quizás sea la única forma de control asequible y eficaz. ¿Que otro método de control podría pensarse para el control de malezas tan arraigadas, dominantes e invasoras como los “abrepuños” en la pradera pampeana occidental? Sin embargo, y a pesar de lo promisorio del control biológico, este es desechado por considerárselo una metodología de difícil, sino imposible, implementación en el país. Es esta una idea sin sustento que debe ser cambiada. La cooperación científica internacional, los avances del control biológico y la posibilidad de contar con agentes de control a través de esa cooperación, convierten al control biológico en una herramienta utilizable y económicamente asequible. Para ello, es necesario trazar objetivos y metas claros de control, establecer vínculos serios con institutos de control biológico de los países centrales, y por sobre todas las cosas, atreverse a crear un programa de control biológico que cuente con las suficientes garantías de perdurabilidad que entusiasmen a los potenciales colaboradores extranjeros.Natural areas of Argentina, protected because of their unique fauna, flora and landscape, are threatened by non-indigenous plants

  12. 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 marina can be considered a good biomonitor of the δ-ALAD activity inhibition and hematological alterations at low lead concentrations. PMID:22580791

  13. Evaluación de la efectividad de las áreas protegidas para contener procesos de cambio en el uso del suelo y la vegetación. ¿Un índice es suficiente? Evaluation of protected area effectiveness for preventing land use and land cover changes in Mexico. Is an index good enough?

    Directory of Open Access Journals (Sweden)

    Fernanda Figueroa

    2011-09-01

    Full Text Available Se examina la efectividad de 44 áreas protegidas federales (AP en México para evitar procesos de cambio en el uso del suelo y la vegetación (CUSV y se comparan los métodos y resultados con los de algunos estudios previos. Se cuantificó el porcentaje de superficie transformada (ST en 2002 y su tasa de cambio entre 1993 y de 2002 y se compararon las tasas de cambio observadas en las AP, en las áreas circundantes de cada AP y en sus respectivas ecorregiones. Se integró un índice de efectividad y se caracterizaron los procesos de CUSV en cada AP. En 2002, el 77% de las AP analizadas tenía menos de 20% de ST; casi 30% mostró una reducción en la ST, en tanto que en otro 30%, el incremento en la ST fue mayor que la tasa promedio de las AP analizadas. Poco más del 70% de las AP mostraron tasas de CUSV menores a las de sus áreas circundantes y en 80% de las AP, las tasas fueron menores que en sus ecorregiones. En general, estos resultados coinciden con estudios previos, pero existen variaciones según el enfoque metodológico utilizado. Consecuentemente, los índices de efectividad deben complementarse con una caracterización detallada de los procesos de CUSV y la interpretación de los resultados debe matizarse en función de los métodos.Effectiveness of 44 federal protected areas (PA for preventing land use and land cover changes (LULC in Mexico is examined, comparing results and methodological approaches used in previous studies. We quantified the percentage of transformed area (TS in 2002 and its rate of change between 1993 and 2002. We compared observed TS rate of change in PA, adjacent areas, and their ecoregions of location. An effectiveness index was build to produce a characterization of LULC processes developed for each PA. In 2002, 77% PA showed less than 20% covered by TS; nearly 30% of PA showed a reduction of TS. Additionally, in 30% of PA, TS increase exceeded the mean rate for all PA. More than 70% of PA showed lower LULC

  14. Marina Martín Garcia

    OpenAIRE

    De Blaeij, T.; Van Manen, T.R.W.; Van Mechelen, J.; Pijpers, R.; Pleijter, G.; Rubke, T.

    2011-01-01

    Isla Martín Garcia is founded on a rock outcrop in the Río de la Plata which is a natural protected area between Argentina and Uruguay. Due to the extension of the runway at the local airport, wetlands between Isla Timoteo Domínguez and Isla Martín Garcia developed during the last decades. The bay, where the old port was located, was loaded with sediment. After the waters between the two islands sedimented, Isla Hércules is formed and a channel is created. For the location of the marina, thre...

  15. Patrones biogeográficos de los tenebriónidos epigeos (Coleoptera: Tenebrionidae del Área Natural Protegida Península Valdés, Argentina: implicaciones para su conservación Biogeographic patterns of epigean tenebrionids (Coleoptera: Tenebrionidae from Protected Natural Area Península Valdés, Argentina: implications for its conservation

    Directory of Open Access Journals (Sweden)

    Rodolfo Carrara

    2011-12-01

    Full Text Available Se realizó un estudio sobre los patrones biogeográficos de los tenebriónidos epigeos (Coleoptera: Tenebrionidae que habitan el Área Natural Protegida Península Valdés (Chubut, Argentina, basado en datos de colecciones y material recolectado en viajes a la zona. Se presenta una lista exhaustiva de las especies en la que se consigna el grado de adaptación a la aridez de cada una de ellas; un análisis de la calidad del inventario y la estimación de la riqueza total de especies; una evaluación de los patrones de distribución y riqueza, y la identificación de áreas de significativa mayor riqueza o hotspots. Los resultados indicaron que 25 especies con diferente grado de adaptación a la aridez habitan la península, aunque se estima que la riqueza total del área debería ser de 27. Además, se reconoció que los rangos de distribución de los tenebriónidos siguen una distribución log-normal y que sólo 3 especies son endémicas. Espacialmente, la riqueza se distribuyó de forma agregada en la península y se determinaron 10 hotspots. Finalmente, considerando que en la península Valdés están permitidas actividades productivas que originan una importante degradación del hábitat, se examina la implicancia de los resultados para la conservación de los tenebriónidos epigeos.We conducted a study of the biogeographic patterns of epigean tenebrionids (Coleoptera: Tenebrionidae that inhabit the Protected Natural Area Península Valdés (Chubut, Argentina, based on data obtained from collections and collecting trips. We present a comprehensive species list, where we detail the degree of adaptation to aridity shown by each species, an analysis of the quality of the inventory, an estimation of total species richness, and an evaluation of distribution and richness patterns, with the identification of areas of significantly greater richness or "hotspots". The results indicated that 25 species with different degrees of adaptation to aridity

  16. Flora cactológica y especies asociadas en el área natural protegida Sierra Corral de los Bandidos, Nuevo León, México Cactus list and asociated plants of the protected natural area Sierra Corral de Los Bandidos, Nuevo Leon, Mexico

    Directory of Open Access Journals (Sweden)

    María del Pilar Carmona-Lara

    2008-12-01

    Full Text Available El área natural protegida (ANP Sierra Corral de los Bandidos ubicada en la sierra Madre Oriental, al noroeste de Monterrey, sufre el impacto de actividades antropológicas asociadas al matorral submontano (ganadería, agricultura, colecta y urbanismo, disminuyendo sus recursos naturales y amenazando sus especies endémicas, principalmente cactáceas. El propósito del estudio fue conocer la diversidad de cactáceas y especies asociadas en zonas de amortiguamiento y núcleo. Para ello se determinaron índices de riqueza y similitud utilizando un muestreo estratificado con cuadrantes a lo largo de transectos orientados por gradientes altitudinales según su zonificación. En total se registraron 112 taxa (30 cactáceas, 87 (24 cactáceas en zona de amortiguamiento y 80 (19 cactáceas en zona núcleo. Por su densidad, frecuencia y abundancia sobresalieron Echinocereus stramineus (Engelm. Engelm. ex F. Seitz, Cylindropuntia leptocaulis F. M. Knuth in Backeb et F. M. Knuth, Mammillaria melanocentra Poselg., Neolloydia conoidea (DC Britton et Rose, (Cactaceae; Erioneuron avenaceum (H. B et K. Tateoka, (Poaceae; Viguiera stenoloba S. F. Blake; Zexmenia hispida (Kunth A. Gray, (Asteraceae y Agave lechuguilla Torr, (Agavaceae. Existe diferencia significativa entre las poblaciones de cactus de las zonas del ANP, según Jacquard (13%, Sörensen (38% y Morisita (0.44. Ocho cactáceas (7 endémicas están registradas en algún estatus de la NOM-ECOL-059, 2001.The Sierra Corral de los Bandidos is a natural protected area located in the Sierra Madre Oriental mountain range northwest of Monterrey city. This preserve suffers the impact of human activities in the form of cattle ranching, agriculture, harvest of wild plants, and urbanism, diminishing its natural resources and threatening its endemic species, especially from the cactaceae family. The purpose of this study was to obtain information on the diversity of cacti and associated species in the buffer and

  17. Memoria Propuesta: Plan Maestro Área Marina y Costera Protegida de Múltiples Usos Isla Grande de Atacama.

    OpenAIRE

    Vásquez Moraga, Pablo; Aceitón González, Víctor

    2007-01-01

    Este estudio tiene como objetivo la elaboración de un Plan Maestro para la implementación de infraestructura en el AMCP-MU, que permita sustentar actividades de bajo impacto ambiental, como el ecoturismo, la investigación científica, la educación para la sustentabilidad y el repoblamiento de especies hidrobiológicas, entre otras, así como definir plan de inversiones para la materialización de los objetivos planteados.

  18. Hacia un manejo ecosistémico de pesquerías. Áreas marinas protegidas en Uruguay

    OpenAIRE

    Defeo, O.; Horta, S.; Carranza, A.; D. Lercari; de Álava, A.; J. Gómez; Martínez, G.; Lozoya, J.P.; Celentano, E.

    2009-01-01

    El análisis de largo plazo de las pesquerías costeras de Uruguay sugiere que el estado de los principales recursos es preocupante. Esto puede deberse a múltiples causas (sobrepesca, polución, causas naturales), a lo cual se suman fallas en el diseño (e.g. información de base insuficiente) o en la implementación de las normativas vigentes (e.g. fiscalización), así como a la ausencia de un enfoque integrado. Este libro plantea estrategias para el desarrollo e implementación del Manejo Ecosisté...

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

    OpenAIRE

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

    2016-01-01

    Although seagrasses cover only a minor fraction of the ocean seafloor, their carbon sink capacity account for nearly one-fifth of the 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 the seagrass carbon stocks (Corg stock) and the carbon accumulation (Corg accumulation) in the Baltic Sea area. The study sites represent a gradient from sheltered to ex...

  20. Adaptive comanagement of a marine protected area network in Fiji.

    Science.gov (United States)

    Weeks, Rebecca; Jupiter, Stacy D

    2013-12-01

    Adaptive management of natural resources is an iterative process of decision making whereby management strategies are progressively changed or adjusted in response to new information. Despite an increasing focus on the need for adaptive conservation strategies, there remain few applied examples. We describe the 9-year process of adaptive comanagement of a marine protected area network in Kubulau District, Fiji. In 2011, a review of protected area boundaries and management rules was motivated by the need to enhance management effectiveness and the desire to improve resilience to climate change. Through a series of consultations, with the Wildlife Conservation Society providing scientific input to community decision making, the network of marine protected areas was reconfigured so as to maximize resilience and compliance. Factors identified as contributing to this outcome include well-defined resource-access rights; community respect for a flexible system of customary governance; long-term commitment and presence of comanagement partners; supportive policy environment for comanagement; synthesis of traditional management approaches with systematic monitoring; and district-wide coordination, which provided a broader spatial context for adaptive-management decision making. Co-Manejo Adaptativo de una Red de Áreas Marinas Protegidas en Fiyi. PMID:24112643

  1. 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...

  2. Posveshtshenije Teatru / Marina Printseva ; interv. Eteri Kekelidze

    Index Scriptorium Estoniae

    Printseva, Marina

    2008-01-01

    Peterburi kunstniku Marina Printseva unikaalses tehnikas tekstiilpiltide (tikand, aplikatsioon, maal) näitus "Kui kaunis on see maailm!" Tallinnas hotell "Vana Viru" fuajees. Kuraator Olga Ljubaskina. Kunstnikuga tema loomingust

  3. 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.

  4. 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.

  5. Current status and ecological roles of Zostera marina after recovery from large-scale reclamation in the Nakdong River estuary, Korea

    Science.gov (United States)

    Park, Sang Rul; Kim, Jong-Hyeob; Kang, Chang-Keun; An, Soonmo; Chung, Ik Kyo; Kim, Jeong Ha; Lee, Kun-Seop

    2009-01-01

    Large Zostera marina meadows (covering 13.6 km 2) existed in the Nakdong River estuary on the south coast of Korea until the mid-1980s, but these Z. marina beds nearly disappeared due to reclamation of adjacent mud flats for the construction of a port and industrial complex during the late 1980s. Partial recovery of Z. marina meadows occurred recently, and Z. marina coverage of about 0.3 km 2 was observed in this estuary. In this study, shoot morphology, density, biomass, productivity, and tissue nutrient content were measured to evaluate the current status of the Z. marina meadows by comparing these data to those for persistent seagrass meadows in similar geographical areas. Additionally, we examined the ecological roles of Z. marina in this estuary after recovery from the large-scale disturbance. Shoot density (151 shoots m -2) and total biomass (141 g DW m -2) in the estuary were similar to those reported from other Z. marina meadows in Korea. Annual leaf production (1726 g DW m -2 y -1) was higher than generally observed for Z. marina in other geographical areas. These results imply that the existing Z. marina meadows in this estuary have adjusted to local environmental conditions that changed after large-scale reclamation. Estimated annual whole plant carbon (C) and nitrogen (N) incorporations based on shoot production and tissue C and N content were 810.0 g C m -2 y -1 and 59.7 g N m -2 y -1, respectively. These values were equivalent to 2.4 × 10 5 kg C y -1 and 1.8 × 10 4 kg N y -1 for all Z. marina beds in the Nakdong River estuary. This high C and N incorporation into Z. marina tissues suggests that existing Z. marina meadows play important roles in C and N cycles in this estuary. Although the currently existing Z. marina beds in this estuary are persisting and play an important ecological role, anthropogenic factors that cause seagrass declines still affect the estuary. Thus, effective management and monitoring of Z. marina beds and environmental

  6. Capítulo 6. La marina

    OpenAIRE

    Riviale, Pascal

    2015-01-01

    La marina francesa desempeñó, a todo lo largo del siglo xix, un considerable papel en la investigación arqueológica en el Perú. A tal punto que conviene consagrar a esta institución un capítulo entero para tratar de las diferentes facetas de su aporte científico. La participación de la Marina en la recolección de datos, exigida por el desarrollo de las ciencias —naturales y humanas—, fue hecha posible, desde luego, gracias a su presencia efectiva en todos los mares del mundo, ya fuese, como v...

  7. Eelgrass (Zostera marina) tolerance to anoxia

    DEFF Research Database (Denmark)

    Pulido Pérez, Cristina; Borum, Jens

    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...

  8. 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.

  9. Vegetative characteristics of Avicennia marina on the artificial inlet

    Directory of Open Access Journals (Sweden)

    AKBAR GHASEMI

    2012-10-01

    Full Text Available The purpose of this project is attempt to ecological development of Avicennia marina in hyper saline condition. During 2001 and 2002 a restoration mangrove project " planting A. marina in artificial inlet in Bushehr Province, Iran" was carried out in Agriculture &Natural resources research center of Bushehr province in Sabkha lands. Some the vegetative characteristics of such as height, diameter and crown diameter in two aspects were recorded in 2012. To investigate physico-chemical properties of soil were taken in inside and outside of inlet and were analyzed: salinity, soil acidity, potassium, phosphorus, nitrogen, texture of soil were measured. Both of treatments were analyzed by T test in SAS Software. The result showed that a different significant between inside and outside of Inlet in soil acidity, electrical conductivity, potassium content and sand and clay percent. But were not different significant in N and P. After ten years halophyte plants such as: Salicornia herbacea and Halocnemum strobilaceum and animals such as: mudskippers were observed into this area. Site conditions have an influence on the growth of seedling, which shows a different growth in the outside and inside of artificial inlets.

  10. ACONDICIONAMIENTO DE LAS ÁREAS PROTEGIDAS PARA EL DESARROLLO DE ACTIVIDADES DE OCIO Y RECREACIÓN

    Directory of Open Access Journals (Sweden)

    Francisco Orgaz Agüera

    2013-10-01

    Full Text Available Las áreas protegidas son zonas potenciales para la realización de actividades de ocio y recreación en contacto con la naturaleza, si bien, para ello es necesario que se desarrolle la actividad de forma sostenible. El objetivo de este artículo es presentar las diversas acciones mínimas que se deben de ejecutar para acondicionar tales áreas, con la finalidad de que las actividades se desarrollen de forma adecuada. La metodología empleada ha consistido en un trabajo de campo en diversas áreas protegidas de España y República Dominicana. El desarrollo de estas actividades en áreas protegidas contribuye a mejorar el desarrollo socioeconómico de las comunidades locales, y mejoran la conservación de los recursos naturales.

  11. Primera sección- territorio, áreas protegidas y ecosistemas-presentaciones orales.

    OpenAIRE

    Facultad Nacional de Agronomía Medellín, Tercer Simposio Forestal

    2013-01-01

    Aquí se puede encontrar un resumen de las presentaciones orales de la primera sección- territorio, áreas protegidas y ecosistemas- del tercer simposio forestal. Entre los que se encuentran: •Geografía rural de un sector del altiplano de Santa Rosa de Osos •Metodología para la elaboración de modelos digitales del terreno a partir de fotografías aéreas •Variación florística y edáfica de especies arbóreas en bosques de tierra firme en el parque nacional natural Amacayacu, Amazonía ...

  12. Transnacionalidad y minería en las áreas protegidas de Colombia

    OpenAIRE

    Correa Valero, Diana Magally

    2015-01-01

    La presente tesis de doctorado se encuentra inscrita en la línea de investigación ESTADO, TRANSNACIONALIDAD Y SUSTENTABILIDAD; en esta investigación se confrontan deberes, derechos, principios, fines, y políticas de la minería frente a la conservación de las áreas protegidas en Colombia. Estas dos actividades subyacen bajo la dicotomía del desarrollo económico, y/o la conservación ambiental. Una tercera perspectiva, a partir de la transnacionalidad, es el desarrollo sustentable donde sean via...

  13. HORTICULTURA PROTEGIDA EN NAYARIT, MÉXICO: SITUACIÓN ACTUAL Y PERSPECTIVAS

    OpenAIRE

    Juárez-López P; Bugarín-Montoya R; Sánchez-Monteón AL; Balois-Morales R; Juárez-Rosete CR; Cruz-Crespo E

    2012-01-01

    Los objetivos del presente artículo son presentar la situación actual de la horticultura protegida en Nayarit, México y visualizar su probable crecimiento y desarrollo con la implementación de un clúster agroindustrial en el sur. Se describe, de manera general, la situación actual de la horticultura en México, se indican algunos factores agronómicos que favorecen este sistema de producción en el estado y se presenta la situación actual del establecimiento de invernaderos como parte del Clúste...

  14. Modelo de turismo sustentable en Suesca - Cundinamarca como área protegida

    OpenAIRE

    López Rodríguez, Alba Ligia

    2013-01-01

    [ES] La investigación de la presente tesis es del tipo analítico-descriptivo, se desarrolla en Colombia y se enmarca en el municipio de Suesca, perteneciente al Departamento de Cundinamarca. Suesca es declarada área protegida por la Corporación Autónoma Regional de Cundinamarca (CAR) - máxima autoridad ambiental del Departamento-. Esta categoría se otorga por las características territoriales que presenta al ubicarse en la parte más alta de la Cordillera Oriental en la zona de páramo -por enc...

  15. Underwater SLAM in a marina environment

    OpenAIRE

    Ribas Romagós, David; Ridao Rodríguez, Pere; Tardós, Juan Domingo; Neira Parra, José

    2007-01-01

    This paper describes a navigation system for autonomous underwater vehicles (AUVs) in partially structured environments, such as dams, harbors, marinas or marine platforms. A mechanical scanning imaging sonar is used to obtain information about the location of planar structures present in such environments. A modified version of the Hough transform has been developed to extract line features, together with their uncertainty, from the continuous sonar dataflow. The information obtained is inco...

  16. Legal aspects of marina development and operation

    OpenAIRE

    Dromgoole, Sarah; Gaskell, Nicholas; Grant, Malcolm

    1993-01-01

    There is in Britain no co-ordinated legal framework regulating river and coastal zone management and use. This chapter attempts to establish an outline structure, drawing together the provisions relating to the planning, building and operation of marinas. There are problems arising from the distinct jurisdictional boundaries affecting land, foreshore, harbours, seabed, rivers and estuaries, each of which has its own structure of land ownership and is subject to different systems of regulat...

  17. Assessing the Crop Growing Period According to the Climate Change Forecasts for Marina Baixa (SE Spain)

    OpenAIRE

    Herrera, Mario; Moutahir, Hassane; González, Carlos Alberto; Chirino Miranda, Esteban; Bellot Abad, Juan Francisco

    2015-01-01

    The present work aims to assess the likely effects of climate change on the length of growing period (LGP) of crops in Marina Baixa (SE, Spain). LGP can be assessed by a balance between preci- pitation and reference evapotranspiration. Less rainfall and an increased evapotranspiration, forecast by Global Climate Models (GCMs), are considered as a high risk for agriculture. This area is located in a semiarid climate region where water is a very limited resource. It is a typical example of area...

  18. 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.

  19. Estudios de propuestas y seguimiento de los ecosistemas vulnerables marino de profundidad. El Cachucho, primer Área Marina Protegida profunda de España

    OpenAIRE

    Sanchez Delgado, Francisco Javier

    2015-01-01

    El Cachucho, conocido como Banco Le Danois por la comunidad científica, es una plataforma marginal rocosa de tamaño equivalente a los Picos de Europa, situada en el Mar Cantábrico y que presenta características típicas de los ecosistemas profundos de las montañas submarinas junto con una gran influencia continental, debido a su proximidad a la plataforma. Un equipo multidisciplinar de investigadores del IEO concibió el proyecto ECOMARG con el objetivo de conocer las características de este ec...

  20. Protocolo Indicador Riqueza de aves acuáticas. Indicadores de monitoreo biológico del Subsistema de Áreas Marinas Protegidas (SAMP).

    OpenAIRE

    Navarrete Ramírez, Sandra Milena

    2014-01-01

    La caracterización de las comunidades biológicas requiere de la documentación de sus propiedades emergentes, entre estas, la riqueza específica es la más frecuentemente utilizada para describir una taxocenosis basándose sólo en el número de especies presentes, sin tomar en consideración el valor de importancia relativa de las mismas.

  1. Protocolo Indicador Densidad poblacional de pez león (Pterois volitans). Indicadores de monitoreo biológico del Subsistema de Áreas Marinas Protegidas (SAMP).

    OpenAIRE

    Navarrete Ramírez, Sandra Milena

    2014-01-01

    Las especies invasoras deterioran los recursos naturales y, en consecuencia los servicios ecosistémicos. Los ambientes acuáticos en particular han demostrado ser extremadamente sensibles, aproximadamente el 40% de las extinciones de especies que habitan estos ambientes han estado relacionadas con la depredación, el parasitismo o la competencia de especies invasoras. El pez león como especie invasora, altera la estructura y composición de las comunidades biológicas de los ecosistemas arrecifal...

  2. 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.

  3. 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

  4. 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

  5. Heavy metal contamination in sediments and mangroves from the coast of Red Sea: Avicennia marina as potential metal bioaccumulator.

    Science.gov (United States)

    Usman, Adel R A; Alkredaa, Raed S; Al-Wabel, M I

    2013-11-01

    The aim of this study was to investigate the concentrations and pollution status of heavy metals (Cu, Cd, Ni, Pb, Zn and Cr) in the mangrove surface sediments from the Farasan Island, Coast of Red Sea, Saudi Arabia. The ability of mangroves (Avicennia marina) to accumulate and translocate heavy metal within their different compartments was also investigated. Five sampling sites were chosen for collection of sediments and different compartments (leaf, branch and root) of A. marina. The results showed that the maximum and average concentrations of Cd, Cu and Pb in the studied area exceeded their world average concentration of shale. Additionally, only the maximum concentration of Zn exceeded its world average shale concentration. Based on the quality guidelines of sediment (SQGs), the collected sediment samples were in moderate to heavy rate for Cu, non-polluted to heavy rate for Pb and Zn, and non-polluted to moderate rate for Cr and Ni. The average metal concentrations of A. marina in the studied area were observed in the order Cu (256.0-356.6mgkg(-1))>Zn (29.5-36.8mgkg(-1))>Cr (8.15-14.9mgkg(-1))>Ni (1.37-4.02mgkg(-1))>Cd (not detectable-1.04mgkg(-1))>Pb (not detectable). Based on bio-concentration factors (BCF), their most obtained values were considered too high (>1), suggesting that A. marina can be considered as a high-efficient plant for bioaccumulation of heavy metals. Among all metals, Cu and Cr were highly bio-accumulated in different parts of A. marina. In terms of heavy metal contamination control via phyto-extraction, our findings suggest also that A. marina may be classified as potential accumulator for Cu in aboveground parts, as indicated by higher metal accumulation in the leaves combined with bio-concentration factor (BCF) and translocation factor (TF) values >1. PMID:24011858

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

    OpenAIRE

    Ahmad Herison; Fredinan Yulianda,; Cecep Kusmana; I Wayan Nurjaya; Luky Adrianto

    2014-01-01

    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 us...

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

    OpenAIRE

    Ahmad Herison; Fredinan Yulianda,; Cecep Kusmana; I Wayan Nurjaya; Luky Adrianto

    2014-01-01

    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 us...

  8. La dinámica marina

    OpenAIRE

    Torres Pérez-Hidalgo, Trinidad José de

    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, ...

  9. Bioaccumulation of trace elements by Avicennia marina

    OpenAIRE

    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 m...

  10. Nuevos registros de clorofitas marinas para Cuba

    OpenAIRE

    A. Moreira; Fujii, M.T.; Suárez, A. M.; Wynne, M.J.

    2013-01-01

    A partir de muestras colectadas en la bahía de Cienfuegos y de Santa Lucía (Pinar del Río), se identificaron dos nuevos registros de macroalgas marinas (clorofitas) para Cuba: Cladophora blomquistii C. Hoek y Udotea fibrosa D. S. Littler & M. M. Littler. C. blomquistii se registra por primera vez para la región del Caribe ya que se había consignado solo para lagunas costeras de la Florida, y la parte noreste del golfo de México. Se ofrecen además comentarios sobre la taxonomía, ...

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

    Directory of Open Access Journals (Sweden)

    Sheng Liu

    2013-10-01

    Full Text Available 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. Oxyrrhis marina (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

  12. 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

    Directory of Open Access Journals (Sweden)

    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

  13. Valoración económica del patrimonio natural: las áreas naturales protegidas

    Directory of Open Access Journals (Sweden)

    Zaniel I. Novoa Goicochea

    2011-12-01

    Full Text Available Economic Valuation of the natural patrimony: Protected Natural AreasThis paper offers some knowledge about the utility of Economic Valuation of Assets out of  market methods, to allow management in general and as a guide to the planning of natural areas with valuable ecologic and landscaping aspects. Here, I show the importance of the Protected Natural Areas (ANP in the national economy and their economic value. I describe the most used techniques in the valuation of ANPs with special attention to the direct using values through the application of cost of travel and contingent valuation methods.As an example of the use of these techniques, I present the application results at the Private Conservation Area-El Cañoncillo Natural Forest, with the objective to analyze the pertinence of the economic valuation by the adoption of conservation practices.El presente artículo brinda conocimientos sobre la utilidad de los métodos de valoración económica de los bienes sin mercado, tanto para su gestión en general como para que sirva de guía para la planificación de áreas naturales ecológica y paisajísticamente valiosas en particular. Muestra la importancia de las áreas naturales protegidas (ANP en la economía nacional y su valoración económica. Se describen las técnicas más usadas en la valoración de las ANP, con especial atención en los valores de uso directo a través de la aplicación de métodos de costo de viaje y de valoración contingente (CVVC.Como ejemplo de uso y potencial de estas técnicas se presentan los resultados de su aplicación en el Área de Conservación Privada Bosque Natural El Cañoncillo, con el objetivo de analizar la viabilidad de la valoración económica por medio de la adopción de prácticas de conservación.

  14. El lugar de las áreas protegidas en el marco de la planificación territorial en la Argentina: el caso del PET

    Directory of Open Access Journals (Sweden)

    Juan Pablo Morea

    2016-06-01

    Full Text Available RESUMEN En el año 2004 el gobierno argentino inició un proceso de planificación y ordenamiento territorial. La iniciativa coordinada por el Ministerio de Planificación, Inversión Pública y Servicios, que contó con la participación de todas las provincias del país, redundó en el Plan Estratégico Territorial 2004-2016 (PET. Mediante el análisis comparativo de las distintas políticas, estrategias y proyectos manifiestos en este plan, este trabajo plantea identificar la consideración de las Áreas Protegidas en el modelo territorial propuesto, comparando la importancia entre las distintas políticas sectoriales enunciadas y las necesidades de las áreas a proteger. Del análisis de los resultados, se concluye que se priorizan políticas vinculadas con la implantación de infraestructura, comunicaciones y desarrollo urbanístico, por sobre iniciativas vinculadas a conservación, protección y atención de las aptitudes naturales del territorio. Como consecuencia, no sólo la expansión de la superficie protegida no es prioritaria como política de ordenamiento territorial, sino que en muchos casos las necesidades de estos espacios son dejadas de lado en pos de la refuncionalización económica y productiva. ABSTRACT In 2004 the Argentine government began a process of planning and land use. The initiative coordinated by the Ministry of Planning, Public Works and Services, which included the participation of all provinces; resulted in the Territorial Strategic Plan 2004-2016 (PET. By comparative analysis of the various policies, strategies and projects manifested in this plan; this paper proposes to identify the importance and the role that protected areas occupy in the territorial model proposed, the degree of compatibility between the different sectoral policies and the needs of these areas to be protected. As a result, we conclude that policies related to infrastructure, communications and urban development, are prioritized above

  15. 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.

  16. St Marina and Satan: A Syriac dialogue poem

    OpenAIRE

    Brock, Sebastian P.

    2008-01-01

    Syriac authors took over and adapted the ancient Mesopotamian genre of precedence dispute, transforming it into a dispute or dialogue, with theological overtones, which is normally between biblical characters. A small number of these dialogue poems concern saints, rather than biblical characters, and it is one of these, where the protagonists are St Marina and Satan, which is re-published here in a critical edition, together with three soghyatha which concern the life of St Marina. All are ta...

  17. Vegetative characteristics of Avicennia marina on the artificial inlet

    OpenAIRE

    AKBAR GHASEMI; HAMID JALILVAND; SOHEIL MOHAJERI-BORAZJANI

    2012-01-01

    The purpose of this project is attempt to ecological development of Avicennia marina in hyper saline condition. During 2001 and 2002 a restoration mangrove project " planting A. marina in artificial inlet in Bushehr Province, Iran" was carried out in Agriculture &Natural resources research center of Bushehr province in Sabkha lands. Some the vegetative characteristics of such as height, diameter and crown diameter in two aspects were recorded in 2012. To investigate physico-chemical propertie...

  18. 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.

  19. en un área natural protegida en Baja California Sur

    Directory of Open Access Journals (Sweden)

    Elizabeth Olmos-Martínez

    2008-01-01

    Full Text Available Aquí se aborda el concepto de pobreza, enmarcado en el contexto de un área natural protegida (ANP, con la metodología propuesta por la Secretaría de Desarrollo Social (SEDESOL, cuya política pública maneja tres categorías para medirla: pobreza alimentaria, pobreza de capacidades y pobreza de patrimonio. El estudio de caso se efectuó en el ejido San Jorge (ESJ, ubicado dentro de la Reserva de la Biosfera Sierra La Laguna (REBISLA, en Baja California Sur. El análisis está basado en datos recolectados en entrevistas a los pobladores del lugar; se consideró el ingreso real diario per cápita, el cual indica si la persona es capaz de satisfacer las necesidades comprendidas en cada categoría, con un ingreso mínimo indispensable. Los resultados indican que la pobreza en la zona, de 2000 a 2004, no varió significativamente. Se concluyó que los habitantes del ESJ son pobres, según los propios parámetros de SEDESOL, y que su condición no ha mejorado, aunque viven en un ANP. Se analizan algunas alternativas que podrían ayudar a amortiguar este rezago.

  20. Sustentabilidade econômica das áreas protegidas no brasil: lacunas institucionais para a consolidação de alternativas

    Directory of Open Access Journals (Sweden)

    Ana Lucia Camphora

    2009-01-01

    Full Text Available La sustentabilidad económica de la gestión de las áreas protegidas de Brasil es un tema en la agenda reciente, en que prevalecen omisiones relativas por falta de información sistematizada y actualizada acerca del presupuesto de las áreas protegidas del Sistema Nacional de Unidades de Conservación. Más que identifi car y cuantifi car alternativas a las reducidas fuentes fi nancieras, se busca una mayor visibilidad sobre sus componentes institucionales. Dada su relevancia, el tema integración del proyecto de ampliación territorial de las áreas protegidas, en la medida en que cada nueva hectárea 'protegida en papel', implica una mayor demanda de recursos financieiros, materiales y humanos para su gestión. En ese sentido, el examen de los impasses institucionales y operacionales para la captación y aplicación de esos recursos, sirve para propiciar elementos analíticos esenciales para profundizar el entendimento sobre algunos impasses institucionales recurrentes en el proceso. Sobre un enfoque institucional, la expansión territorial de las áreas protegidas tropieza en estructuras tecno-burocráticas poco dinámicas para imprimir operacionalizaciones y consolidar las fuentes financeras efectivas y potenciales. Se espera que esas contribuiciones propicien progresos en las reflexiones sobre los contextos nacionales de América Latina y el Caribe.

  1. O desmatamento na Amazônia e a importância das áreas protegidas

    Directory of Open Access Journals (Sweden)

    Leandro Valle Ferreira

    2005-04-01

    Full Text Available O MODELO da ocupação demográfica da Amazônia legalnos últimos cinqueta anos tem levado a níveis significativos de desmatamento, resultante de múltiplos fatores, tais como a abertura de estradas pioneiras, o crescimento das cidades, a ampliação de pecuária extensiva, a acelerada exploração madeireira e a crescente agricultura intensiva de monoculturas. A área cumulativa desmatada na Amazônia legal brasileira chegou a cerca de 653.000 km² em 2003, correspondendo a 16,3% da região. Este estudo visou a determinar o desmatamento dentro e fora dos atuais Unidades de Conservação (UC e Terras Indígenas (TI na Amazônia legal, nos estados de Mato Grosso, Rondônia e Pará, que, juntos, corresponderam por mais de 90% do desmatamento observado entre 2001 e 2003. Os resultados mostraram que o desmatamento foi cerca de dez a vinte vezes menor dentro das Unidades de Conservação e Terras Indígenas do que em áreas contíguas fora delas. Isto demonstra a importância dessas áreas protegidas para diminuir o processo do desmatamento nos três estados. Isto refuta a hipótese generalizada de que estas áreas não cumprissem a sua função principal na conservação e uso racional dos recursos na Amazônia legal.DEMOGRAPHIC occupation of the Brazilian Legal Amazon within the past 50 years has lead to significant levels of deforestation as the result of several factors such as new road construction, urban growth, expansion of extensive cattle ranching, increasing timber extraction, and rising intensive agriculture of monocultures. The cumulative deforested area in Brazil's Legal Amazonia was approximately 653,000 km² in 2003, correspondingto 16,3% of the region. This study sought to assess deforestation within or near to protected areas (conservation units and indigenous reserves in Legal Amazonia in the states of Mato Grosso, Rondônia, and Pará that jointly were responsible for more than 90% of regional deforestation from 2001 to 2003

  2. Las Áreas Naturales Protegidas en México. Un ejemplo de propuesta de gestión de una Área Protegida y plan de manejo en "La Sierra de Monte Escobedo" (Zacatecas, México)

    OpenAIRE

    Valle Rodríguez, Santiago

    2006-01-01

    Inicialmente, se presenta una introducción donde se describe una información global histórica de la conservación y protección de la naturaleza. El papel, función e importancia de la gestión en las áreas Naturales protegidas (ANP) y la situación actual de México en estos temas. A continuación, se presentan los antecedentes, donde se describe la problemática ambiental global, la función del desarrollo sostenible en las ANP, la importancia de la biodiversidad en las ANP, el desarrollo del conser...

  3. Sistema de actividades de capacitación para los trabajadores de las áreas protegidas orientada a la conservación y uso sostenible de la fitodiversidad.

    Directory of Open Access Journals (Sweden)

    Rafael Risco Villalobos

    2013-01-01

    Full Text Available RESUMEN Se presenta un sistema de actividades de capacitación dirigida a los trabajadores de la conservación en las áreas protegidas de la provincia Camagüey, orientada a la conservación y uso sostenible de la fitodiversidad. Se emplearon métodos teóricos y empíricos tales como: el histórico, lógico, el análisis y la síntesis, la observación, la encuesta y análisis de los documentos, entre otros. El sistema está debidamente contextualizado en la educación popular y posee un enfoque participativo y transformador, donde el aprendizaje y la conceptualización se nutren de la experiencia práctica de los propios trabajadores en cada área protegida, de modo tal que estos participan activamente en la solución o mitigación de los problemas en el marco de su actividad laboral cotidiana. System training activities for workers of Protected Areas facing the conservation and sustainable use of plant diversity. ABSTRACT A system of training activities aimed at conservation workers in protected areas of the Camagüey province, aimed at the conservation and sustainable use of plant diversity is presented. The historical, logical analysis and synthesis, observation, survey and analysis of documents, including: theoretical and empirical methods such as were employed. The system is properly contextualized in popular education and has a participatory and transformative approach, where learning and conceptualization draw on the practical experience of the workers themselves in every protected area, so that they are actively involved in the resolution or mitigation problems in the context of their daily work activities.

  4. Estrategias de competitividad turística en las áreas naturales protegidas de Quintana Roo, México

    OpenAIRE

    Segrado Pavón, Romano Gino; Serrano-Barquín, Rocío del Carmen; Juan Pérez, José Isabel; Cruz Jiménez, Graciela; Arroyo Arcos, Lucinda

    2015-01-01

    Las Áreas Naturales Protegidas (ANP) son espacios de protección de ecosistemas únicos o representativos de una región, que históricamente se han gestionado como fortalezas ecológicas, aunque también deberían vincularse con factores sociales y económicos, que en conjunto representan la clave del éxito de la conservación en el largo plazo, al integrar la triple base de la sustentabilidad por medio de estrategias culturalmente apropiadas para los sistemas y procesos ecológicos que impulsan la co...

  5. Áreas Protegidas e desenvolvimento em meio rural : o Parque Natural do Vale do Guadiana 20 Anos depois

    OpenAIRE

    Costa, Marco Gonçalo da Silva

    2015-01-01

    Esta Dissertação tem como objetivo, avaliar o impacto da criação do Parque Natural do Vale do Guadiana no desenvolvimento local. Esta área protegida que em 2015 completa 20 anos de existência, está inserida numa região marcada profundamente por problemas de ordem estrutural, assinalados pela reduzida oferta de emprego, forte emigração e envelhecimento, baixa densidade populacional e níveis críticos de infraestruturas, equipamentos e serviços. Assim sendo, passadas duas décadas desde a sua ...

  6. 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.

  7. Impactos socioambientales de la gestión del agua en el área natural protegida de Cuatro Ciénegas, Coahuila

    OpenAIRE

    Sandra Eloisa Ortiz Acosta; María de Lourdes Romo Aguilar

    2016-01-01

    El área natural protegida Cuatro Ciénegas, Coahuila, posee un ecosistema desértico valioso, con endemismos y humedales Ramsar, que ha resultado perjudicado por las ac- tividades económicas no reguladas, como la agricultura y el turismo. Las acciones de gestión implementadas por la Comisión Nacional de Áreas Naturales Protegidas y la Comi- sión Nacional del Agua también han tenido repercusiones socioambientales. Por ello, el objetivo del presente tra...

  8. LAS ÁREAS PROTEGIDAS EN REPÚBLICA DOMINICANA: UN ANÁLISIS DE LA LEGISLACIÓN DESDE LA PERSPECTIVA DEL ECOTURISMO

    OpenAIRE

    Francisco Orgaz Agüera

    2014-01-01

    El ecoturismo se configura como una forma de turismo que genera beneficios en las comunidades locales, además de fomentar la conservación hacia los recursos naturales y el medio ambiente. Así, esta tipología turística, en muchos lugares, se practica en áreas protegidas. En este sentido, el objetivo principal de esta investigación es analizar la legislación de las áreas protegidas en República Dominicana, desde la perspectiva del ecoturismo. Este análisis muestra que existen diversas debilidad...

  9. Calidad del agua en marinas pequeñas

    OpenAIRE

    Fuentes Mariles, Óscar Arturo; Osnaya Romero, Javier; Magaña Melgoza, Pedro A.

    1997-01-01

    Se describe un método para calcular la concentración de un contaminante o bien la concentración de oxígeno disuelto (OD) y la demanda bioquímica de oxígeno (DBO) para una marina donde existe un mezclado completo de las sustancias en sus aguas. Los resultados del método permiten analizar la calidad del agua, revisar el tamaño de la marina, evaluar las consecuencias de la descarga de un contaminante, estimar la magnitud de bombeos para reducir la concentración de contaminantes, etc. También se ...

  10. Trace elements in the sediments of a large Mediterranean marina (Port Camargue, France): levels and contamination history.

    Science.gov (United States)

    Briant, Nicolas; Bancon-Montigny, Chrystelle; Elbaz-Poulichet, Françoise; Freydier, Rémi; Delpoux, Sophie; Cossa, Daniel

    2013-08-15

    The study of trace elements (Cu, Zn, Pb, As, Hg) and butyltin concentrations in the sediments of Port Camargue enabled assessment of the levels and history of the contamination of the largest European marina linked with the use of antifouling paints. Surface sediments near the boat maintenance area were heavily contaminated with up to 1497 μg g(-1) of Cu, 475 μg g(-1) of Zn, 0.82 μg g(-1) of Hg, 94 μg g(-1) of Pb and over 10,000 ngSn g(-1) of tributyltin (TBT). High concentrations of Hg and TBT indicate ongoing sources of these elements despite the ban on their use as biocides in paints. Sediment cores provided records of contamination since 1969. The peak concentrations of As, Hg, Pb and TBT in the sediment profile reflect their presence on boat hulls when the marina was built at the end of the 1960s. Degradation of TBT in the sediments near the boat maintenance area is slow compared to other less contaminated area of the marina. PMID:23790459

  11. 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.

  12. Susceptibility of fish to Chattonella marina is determined by its tolerance to hypoxia.

    Science.gov (United States)

    Shen, Min; Xu, Jingliang; Chan, Alice K Y; Au, Doris W T

    2011-01-01

    The harmful alga Chattonella marina has caused massive fish kills and economic losses worldwide. However, the fish kill mechanisms by C. marina have not been identified. The present study has confirmed that a significant elevation of blood osmolality is the universal response in moribund fish exposed to C. marina and the possible reasons leading to contradictory reports were identified. Both osmotic distress and respiratory impairment are important mechanisms leading to fish kill by C. marina. The susceptibility of marine fish to C. marina appears to be inversely related to their tolerance to hypoxia, with the hypoxia intolerant goldlined seabream being the most susceptible, and the hypoxia tolerant green grouper being the most tolerant to C. marina. Further studies in the marine medaka (Oryzias melastigma) showed that fish susceptibility to C. marina is directly related to susceptibility of the fish to hypoxia, but not related to its tolerance to hypersalinity stress. PMID:21704342

  13. 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

  14. Assessment of trace metal bioaccumulation by Avicennia marina (Forsk.) in the last remaining mangrove stands in Manila Bay, the Philippines.

    Science.gov (United States)

    Gabriel, Ana Veronica S; Salmo, Severino G

    2014-12-01

    Concentrations of lead (Pb), copper (Cu), zinc (Zn), and cadmium (Cd) were evaluated in the sediments, roots and leaves of a mangrove species (Avicennia marina) in Las Piñas-Parañaque Critical Habitat and Ecotourism Area (LPPCHEA), Manila Bay. The concentrations showed a general pattern of Zn > Pb > Cu > Cd in sediments, Cu > Pb > Zn > Cd in roots and Cu > Zn > Pb > Cd in leaves. The trace metal concentrations in both sediments and plant tissues were below contamination threshold levels. Based on computed bioaccumulation indices, A. marina could be used for the phytostabilization and phytoextraction of Cu and Cd. The LPPCHEA mangrove ecosystem is an ecologically important ecosystem that will limit the spread of trace metals to the surrounding environment. PMID:25365960

  15. 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)

  16. 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.

  17. Rapid increase in copper concentrations in a new marina, San Diego Bay.

    Science.gov (United States)

    Biggs, Trent W; D'Anna, Heather

    2012-03-01

    Concentrations of copper in water rose rapidly following the introduction of boats to a new marina in San Diego Bay. Two months after the marina reached half its capacity, a majority of water samples exceeded chronic and acute criteria for dissolved copper, and copper concentrations in several samples exceeded the highest concentrations observed in another marina that has been listed as an impaired water body. A box model suggested that a small fraction of the leached copper was sequestered in sediment. Copper concentrations in water entering the marina from the bay was more than half the chronic concentration limit, so only 50% of marina boat capacity could be accommodated without exceeding the chronic criterion more than 50% of the time. Copper concentrations in water may increase rapidly following boat introduction in small marinas, but could return to pre-introduction levels by controlling boat numbers or reducing use of copper-based paints. PMID:22245437

  18. The MARINA model (Model to Assess River Inputs of Nutrients to seAs)

    OpenAIRE

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

    2016-01-01

    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...

  19. Who is Oxyrrhis marina? Morphological and phylogenetic studies on an unusual dinoflagellate

    OpenAIRE

    Lowe, Christopher D; Keeling, Patrick J.; Martin, Laura E.; Watts, Phill C; Montagnes, David

    2010-01-01

    Abstract Oxyrrhis marina is a well studied and common protist, used model to a range of ecological processes. Further, as a result of unusual cytological and genetic features, Oxyrrhis is increasingly a target for the study of evolutionary development within the Alveolata. However, morphological and phylogenetic data suggest that O. marina represents multiple species. As different research groups employ different O. marina isolates, the context in which comparisons between isola...

  20. Redes sociales y Áreas Naturales Protegidas en la Zona Metropolitana de Monterrey, Nuevo León

    Directory of Open Access Journals (Sweden)

    Gabriela de la Mora-de la Mora

    2015-01-01

    Full Text Available A partir del análisis de las dinámicas de interacción entre actores sociales clave, vinculados a la gestión de las áreas naturales protegidas y a la protección de los servicios ambientales hidrológicos en la Zona Metropolitana de Monterrey ( zmm , Nuevo León, se analizan las acciones que se llevan a cabo para lograr los objetivos de conservación. Se utiliza el análisis de redes para comprender la estructura y densidad de las relaciones sociales establecidas y su influencia en la definición de la gobernanza ambiental actual en la región, lo que permite destacar la exis - tencia de alianzas estratégicas en materia de conservación y al mismo tiempo la falta de comunicación en otros sectores.

  1. Auto toxicity of avicennia marina (forsk.) vierh in pakistan

    International Nuclear Information System (INIS)

    During field survey it was observed that despite the presence of full sunlight mangrove forests show gaps or small number of stunted seedlings. These observations leaded to consider evaluation of autotoxicity of A.marina, therefore a glasshouse experiment was conducted to observe the possible allelopathic effects of leaf and pneumatophore extracts of Avicennia marina on its own seedling survival and growth. Two different types of soil with a total of five treatments of leaves and pneumatophores were used including control amid five replicates. The results showed that the extracts from Avicennia leaves and pneumatophores had inhibitory effects on it's own growth. The leaf extracts showed stronger allelopathic effects than pneumatophore extracts on root length and dry weight while pneumatophore extracts had greater allelopathic effects on shoot height. Therefore, it may also be concluded that besides shade, allelopathy may be responsible for lack of Avicennia seedlings under its own mother plant. (author)

  2. Conjuring Life: Magic in the Poetics of Marina Tsvetaeva

    OpenAIRE

    Lane, Tora

    2013-01-01

    This article discusses the notion of magic in the poetics of Marina Tsvetaeva (1892–1941) against the backdrop of romanticism and Russian modernism. Magic is related to the poet’s explorations of folklore, and also to Romantic, symbolist and futurist invocations of it. Concepts of magic are central to Tsvetaeva’s poetics; she considers conjuration to be a property of language that facilitates contact with the demonic, elemental and natural aspects of the world. These elemental ...

  3. Del “mar es de todos” al mar reservado: turistas, poblaciones de pescadores y reservas marinas en Canarias

    Directory of Open Access Journals (Sweden)

    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

  4. 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.

  5. Toads on Lava: Spatial Ecology and Habitat Use of Invasive Cane Toads (Rhinella marina) in Hawai’i

    OpenAIRE

    Georgia Ward-Fear; Greenlees, Matthew J.; Richard Shine

    2016-01-01

    Most ecological research on cane toads (Rhinella marina) has focused on invasive populations in Australia, ignoring other areas where toads have been introduced. We radio-tracked and spool-tracked 40 toads, from four populations on the island of Hawai'i. Toads moved extensively at night (mean 116 m, from spool-tracking) but returned to the same or a nearby retreat-site each day (from radio-tracking, mean distance between successive retreat sites 11 m; 0 m for 70% of records). Males followed s...

  6. Impactos socioambientales de la gestión del agua en el área natural protegida de Cuatro Ciénegas, Coahuila

    Directory of Open Access Journals (Sweden)

    Sandra Eloisa Ortiz Acosta

    2016-01-01

    Full Text Available El área natural protegida Cuatro Ciénegas, Coahuila, posee un ecosistema desértico valioso, con endemismos y humedales Ramsar, que ha resultado perjudicado por las ac- tividades económicas no reguladas, como la agricultura y el turismo. Las acciones de gestión implementadas por la Comisión Nacional de Áreas Naturales Protegidas y la Comi- sión Nacional del Agua también han tenido repercusiones socioambientales. Por ello, el objetivo del presente trabajo es analizar los impactos sociales y ambientales derivados de la gestión del agua en esta área natural protegida, a través de la aplicación de entrevistas semiestructuradas a actores clave. La información se analizó mediante una adaptación a la metodología de la teoría fundamentada. A partir de los resultados, se concluyó que los daños socioambientales se deben a que las instituciones no han logrado compatibilizar las políticas de conservación con las de aprovechamiento sustentable de los recursos naturales, lo que contribuye al deterioro del ecosistema y a la inconformidad de la población.

  7. Evaluación de redes tecnocientíficas: la red española sobre Áreas Protegidas, según la Web of Science

    Directory of Open Access Journals (Sweden)

    Pino-Díaz, José

    2011-09-01

    Full Text Available Relationships of co-occurrence between keywords, researchers and journals in the professional literature of a given domain can be analyzed and mapped to discover their nodes, subnets, and strategic research areas. A strategic and dynamic analysis was done of the Spanish Research Network on Protected Areas from 1981 to 2005, as identified by the Web of Science. This analysis has resulted in a Strategic Diagram and a Strategic Knowledge Map of Techno-scientific Network or CERT Map, lists of researchers and journals of strategic importance, and a table analyzing the activity of the subnets. The techno-scientific network is well-structured, with twenty-two strategic subnets. Network analysis using KDD techniques and engineering and knowledge mapping provides top grade support for strategic decision-making in science policy and the evaluation of science and technology.

    Las relaciones de coocurrencia entre las palabras clave, los investigadores y las revistas en los artículos científicos de un dominio documental concreto confi guran una red tecnocientífica que puede ser analizada y cartografiada para conocer los nodos, subredes y áreas de investigación estratégicas, relevantes o importantes. Se ha realizado el análisis estratégico y el análisis dinámico, de traducción o de cambio, de la Red de Investigación Española sobre Áreas Protegidas según la Web of Science en el período 1981-2005. Producto de este análisis se han obtenido el Diagrama Estratégico y el Mapa de Conocimiento Estratégico de la Red Tecnocientífica o Mapa CERT, los listados de investigadores y de revistas de importancia estratégica y la tabla de análisis de actividad de las subredes. La red tecnocientífica analizada es una red bien estructurada, en la que se han identificado veintidós subredes estratégicas de investigación. El análisis de las redes tecnocientíficas mediante técnicas de creación de nuevo conocimiento a partir de bases de datos

  8. The protozoa dinoflagellate Oxyrrhis marina contains selenoproteins and the relevant translation apparatus

    International Nuclear Information System (INIS)

    In the phylogenetic tree, selenoproteins and the corresponding translation machinery are found in Archaea, Eubacteria, and animals, but not in fungi and higher plants. As very little is known about Protozoa, we searched for the presence of selenoproteins in the primitive dinoflagellate Oxyrrhis marina, belonging to the Protoctista kingdom. Four selenoproteins could be obtained from O. marina cells cultured in the presence of 75Se. Using O. marina or bovine liver cytosolic extracts, we could serylate and selenylate in vitro total O. marina tRNAs. Moreover, the existence of a tRNASec could be deduced from in vivo experiments. Lastly, an anti-serum against the specialized mammalian translation elongation factor mSelB reacted with a protein of 48-kDa molecular mass. Altogether, our data showed that O. marina contains selenoproteins and suggests that the corresponding translation machinery is related to that found in animals

  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. El Instituto Hidrográfico de la Marina

    OpenAIRE

    Pérez Carrillo de Albornoz, Francisco J.

    2002-01-01

    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 Instit...

  11. Digital.CSIC en el Instituto de Investigaciones Marinas

    OpenAIRE

    Rodríguez de Diego, María

    2014-01-01

    Desde el año 2008 la biblioteca del Instituto de Investigaciones Marinas (IIM) ha realizado diversas actividades para dar a conocer el repositorio institucional entre los investigadores del centro, animándoles a enviar sus trabajos una vez publicados. Las ventajas innegables que proporciona el acceso abierto a los resultados de investigación, por su inmediatez y el aumento de la visibilidad y del impacto, así como la eliminación de las barreras económicas que dificultan el acceso a la informa...

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

    Science.gov (United States)

    Delefosse, M.; Kristensen, E.

    2012-07-01

    The large number of seeds produced by eelgrass, Zostera marina, provides this plant with a potential to disperse widely and colonise new areas. After dispersal, seeds must be buried into sediment for assuring long-term survival, successful germination and safe seedling development. Seeds may be buried passively by sedimentation or actively through sediment reworking by benthic fauna. We evaluated the effect of three polychaetes on the burial rate and depth of eelgrass seeds. Burial was first measured in controlled laboratory experiments using different densities of Nereis (Hediste) diversicolor (400-3200 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 (1 m2) 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 (animal abundance. Only 2% of seed mimics casted in the field plots were recovered, suggesting that physical dispersion by waves and currents was considerably important for horizontal distribution. However, polychaete affected significantly the vertical distribution of seeds. Overall the effects of these three polychaetes indicate that benthic macroinvertebrates may significantly impact eelgrass seed bank at the ecosystem scale. Some species have a positive effect by burying seeds to shallow depths and thereby reducing seed predation and facilitating seed germination, while other species bury seeds too deep for successful seed germination and seedling development.

  13. Antifouling biocides in water and sediments from California marinas.

    Science.gov (United States)

    Sapozhnikova, Yelena; Wirth, Edward; Schiff, Kenneth; Fulton, Michael

    2013-04-15

    Irgarol 1051 is a common antifouling biocide and is highly toxic to non-target plant species at low ng/L concentrations. We measured up to 254 ng/L Irgarol in water and up to 9 ng/g dry weight Irgarol in sediments from Southern California recreational marinas. Irgarol's metabolite, M1, concentrations were up to 62 ng/L in water and 5 ng/g dry weight in sediments. Another antifouling biocide, diuron, reached up to 68 ng/L in water and 4 ng/g dry weight in sediments. The maximum Irgarol concentrations in water were greater than the Irgarol concentration recommended as the plant toxicity benchmark (136 ng/L), suggesting that Irgarol concentrations may be high enough to cause changes in phytoplankton communities in the sampled marinas. Irgarol concentrations measured in sediments were greater than calculated Environmental Risk Limits (ERLs) for Irgarol in sediments (1.4 ng/g). Antifouling pesticide accumulation in sediments may present a potential undetermined risk for benthic organisms. PMID:23453818

  14. Sulfide Intrusion and Detoxification in the Seagrass Zostera marina.

    Directory of Open Access Journals (Sweden)

    Harald Hasler-Sheetal

    Full Text Available Gaseous sulfide intrusion into seagrasses growing in sulfidic sediments causes little or no harm to the plant, indicating the presence of an unknown sulfide tolerance or detoxification mechanism. We assessed such mechanism in the seagrass Zostera marina in the laboratory and in the field 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 of the detoxification occurred in underground tissues, where sulfide intrusion was greatest. Elemental sulfur was a major detoxification compound, precipitating on the inner wall of the aerenchyma of underground tissues. Sulfide was metabolized into thiols and entered the plant sulfur metabolism as well as being stored as sulfate throughout the plant. We conclude that avoidance of sulfide exposure by reoxidation of sulfide in the rhizosphere or aerenchyma and tolerance of sulfide intrusion by incorporation of sulfur in the plant are likely major survival strategies of seagrasses in sulfidic sediments.

  15. Influence of neighboring plants on shading stress resistance and recovery of eelgrass, Zostera marina L.

    Directory of Open Access Journals (Sweden)

    Camilla Gustafsson

    Full Text Available Stressful environments may enhance the occurrence of facilitative interspecific interactions between plants. In several regions, Zostera marina occurs in mixed assemblages. However, the potential effects of plant diversity on stress responses and stability properties of Z. marina are poorly understood. We investigated the resistance and recovery of Z. marina subjected to shading (1 mo in a field experiment lasting 2.5 mo. We shaded Z. marina planted in mono- and polycultures (Potamogeton perfoliatus, P. pectinatus, P. filiformis in a factorial design (Shading×Richness at 2 m depth. We estimated the resistance and recovery of Z. marina by measuring four response variables. Polyculture Z. marina lost proportionally less biomass than monocultures, thus having a greater resistance to shading. In contrast, after a 1 mo recovery period, monocultures exhibited higher biomass gain, and a faster recovery than polycultures. Our results suggest that plant species richness enhances the resistance of Z. marina through facilitative mechanisms, while the faster recovery in monocultures is possibly due to interspecific competition. Our results highlight the need of a much better understanding of the effects of interspecific interactions on ecosystem processes in mixed seagrass meadows, and the preservation of diverse plant assemblages to maintain ecosystem functioning.

  16. Seagrasses are negatively affected by organic matter loading and Arenicola marina activity in a laboratory experiment.

    Science.gov (United States)

    Govers, Laura L; Pieck, Timon; Bouma, Tjeerd J; Suykerbuyk, Wouter; Smolders, Alfons J P; van Katwijk, Marieke M

    2014-06-01

    When two ecosystem engineers share the same natural environment, the outcome of their interaction will be unclear if they have contrasting habitat-modifying effects (e.g., sediment stabilization vs. sediment destabilization). The outcome of the interaction may depend on local environmental conditions such as season or sediment type, which may affect the extent and type of habitat modification by the ecosystem engineers involved. We mechanistically studied the interaction between the sediment-stabilizing seagrass Zostera noltii and the bioturbating and sediment-destabilizing lugworm Arenicola marina, which sometimes co-occur for prolonged periods. We investigated (1) if the negative sediment destabilization effect of A. marina on Z. noltii might be counteracted by positive biogeochemical effects of bioirrigation (burrow flushing) by A. marina in sulfide-rich sediments, and (2) if previously observed nutrient release by A. marina bioirrigation could affect seagrasses. We tested the individual and combined effects of A. marina presence and high porewater sulfide concentrations (induced by organic matter addition) on seagrass biomass in a full factorial lab experiment. Contrary to our expectations, we did not find an effect of A. marina on porewater sulfide concentrations. A. marina activities affected the seagrass physically as well as by pumping nutrients, mainly ammonium and phosphate, from the porewater to the surface water, which promoted epiphyte growth on seagrass leaves in our experimental set-up. We conclude that A. marina bioirrigation did not alleviate sulfide stress to seagrasses. Instead, we found synergistic negative effects of the presence of A. marina and high sediment sulfide levels on seagrass biomass. PMID:24633960

  17. Micro-organic pollutants and biological response of mussels in marinas and ship building/breaking yards in Turkey.

    Science.gov (United States)

    Okay, O S; Karacık, B; Güngördü, A; Ozmen, M; Yılmaz, A; Koyunbaba, N C; Yakan, S D; Korkmaz, V; Henkelmann, B; Schramm, K-W

    2014-10-15

    Concentrations of PAHs, PCBs and OCPs in sediments and mussels (caged and/or native) were determined at 16 stations in six major sites of coastal Turkey. The biological effects of pollution were evaluated using sediment toxicity tests and enzyme activity assays. EROD, PROD, GST, AChE, CaE, and GR activities were evaluated using the digestive glands of mussels. The total PAH concentrations in the sediments varied between nd and 79,674 ng g(-1) dw, while the total OCP concentrations were in the range of nd to 53.7 ng g(-1) dw. The total PAH concentrations in mussels varied between 22.3 and 37.4 ng g(-1) ww. The average concentrations of total PCBs in mussels were 2795 pg g(-1) ww in the shipyard, 797 pg g(-1) ww in Marina 2 and 53 pg g(-1) ww in Marina 1 stations. The results of whole-sediment toxicity tests showed a strong correlation between toxicity test results and pollutant concentrations. Selected cytosolic enzyme activities in digestive glands differed significantly depending on localities. These differences in enzyme activities were mainly related to the different pollutant levels of the sampling sites. The micro-organic contaminant profile patterns, toxicity tests and biomarker studies showed that shipyards and shipbreaking yards are the major potential sources of organic pollution in coastal areas. PMID:25079235

  18. Effect of Temperature and Nutrient Manipulations on eelgrass Zostera marina L. from the Pacific Northwest, USA

    Science.gov (United States)

    Global climate change will have a large impact on the three predominate drivers of estuarine seagrass productivity, temperature, light and nutrients. I experimentally evaluate the response of Pacific Northwest Z. marina to interactive effects of temperature and nutrient conditio...

  19. JMarinas: a simple tool for the environmentally sound management of small marinas.

    Science.gov (United States)

    Mensa, J A; Vassallo, P; Fabiano, M

    2011-01-01

    A novel index for the preliminary evaluation of the distribution of pollutants in the harbor environment (Small Marinas Pollution Risk) is proposed. An associated Environmental Decision Support System (JMarinas) has been developed which implements the Multiple Attribute Decision Making theory (MADM) and uses the harbor's map as geographical support for computations. The MADM matrix is built considering various attributes of the marina and is calculated using both qualitative and quantitative data. Jmarinas has been applied to two small marinas along the Ligurian coast (Marina degli Aregai and Portosole) during the winter and summer seasons. Results show good spatial and temporal resolution and are in agreement with observations. For further quantitative assessment of performance, we refer to Irene et al. (2010). PMID:20833466

  20. 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)

  1. 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...

  2. Movimentos de Diplodus sp. no interior de uma área marinha protegida observados com recurso a marcação convencional e biotelemetria

    OpenAIRE

    Belo, Ana Filipa Fortuna Andrade Dias, 1990-

    2013-01-01

    Tese de mestrado. Biologia (Ecologia Marinha). Universidade de Lisboa, Faculdade de Ciências, 2013 No presente trabalho foi utilizada marcação convencional e telemetria acústica para estudar os movimentos de Diplodus sp., espécies com elevado valor comercial, no interior da Área Marinha Protegida da Ilha do Pessegueiro, Parque Natural do Sudoeste Alentejano e Costa Vicentina. Foram marcados 1224 exemplares, 894 sargo-legítimos (Diplodus sargus Linnaeus, 1758) e 330 sargo-safias (Diplodus v...

  3. Una aplicación del enfoque multiatributo para un producto agroalimentario con Denominación de Origen Protegida: El Jamón de Teruel

    OpenAIRE

    Joel Espejel Blanco; Carmina Fandos Herrera

    2009-01-01

    El presente trabajo analiza la relación de la calidad percibida de un producto agroalimentario con Denominación de Origen Protegida (DOP) como determinante de la intención de compra de los consumidores. A través de un estudio empírico, dirigido a consumidores españoles de Jamón de Teruel con DOP, y mediante el uso de ecuaciones estructurales, se obtienen unos resultados con base en la diferenciación entre los atributos intrínsecos y extrínsecos de dicho producto y cómo éstos influyen en la sa...

  4. Los modelos de uso turístico de las áreas protegidas de Canarias : una propuesta metodológica

    OpenAIRE

    Moisés R. Simancas Cruz

    2006-01-01

    Las categorías de protección ambiental determinan la adecuada gestión territorial de las áreas protegidas que comprenden y, por consiguiente, su correcta utilización como recurso turístico, en la medida en que fijan la relación de complementariedad —o, cuando menos, de neutralidad— entre esta funcionalidad y el fin último asignado a las mismas según las estrategias de manejo del riesgo de pérdida de su calidad ambiental derivado de la implementación de las actividades y equipam...

  5. En defensa del territorio. Movilización indígena en Áreas Naturales Protegidas de Argentina y Paraguay

    OpenAIRE

    Villalba Portillo, Sara Mabel

    2014-01-01

    [ES]El despojo de tierra y de recursos naturales constituye un agravio secular a los pueblos indígenas en América Latina. En consecuencia, las reivindicaciones en este ámbito han sido una de las principales causas de movilización en las últimas décadas. Uno de los entornos particulares donde se ha registrado este fenómeno ha sido en las denominadas Áreas Naturales Protegidas (ANP)1, establecidas en territorios indígenas sin ningún tipo de consentimiento o consulta previa a los habitantes orig...

  6. CONTENIDOS DE CARBONO ORGÁNICO DE SUELOS SOMEROS EN PINARES Y ABETALES DE ÁREAS PROTEGIDAS DE MÉXICO

    OpenAIRE

    Gerardo Cruz-Flores; Jorge D. Etchevers-Barra

    2011-01-01

    Los contenidos de carbono orgánico del suelo (COS), biomasa microbiana (Cbm) y coeficientes metabólicos (qCO2) son indicadores de sostenibilidad. En México se carece de información sobre contenidos óptimos de COS, Cbm y qCO2 en bosques templados, aunque conocerlos es importante para diseñar estrategias de uso y manejo adecuado de suelos forestales, generalmente someros y vulnerables. Esta investigación se realizó en nueve áreas naturales protegidas de México con bosques templados sobre suelos...

  7. Turismo de naturaleza en áreas protegidas de México. Una propuesta de conservación, aprovechamiento y desarrollo local en el Nevado de Toluca

    OpenAIRE

    Sánchez Jasso, Jessica Mariana; Cebrián Abellán, Francisco

    2015-01-01

    El turismo de naturaleza en Áreas Protegidas de México se considera desde finales del siglo XX como un instrumento de desarrollo socioeconómico. Puesto que esta estrategia es relativamente novedosa para Latinoamérica, su implantación exige de un tratamiento especial y cuidadoso para cada una de las partes del sistema turístico. Se hace necesario asumir los principios de conservación y aprovechamiento sostenible. Se analiza en este caso el Parque Ecológico Ejidal de Cacalomacán,...

  8. 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.

  9. 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.

  10. Metabolism of pyrene by the polychaetes Nereis diversicolor and Arenicola marina.

    Science.gov (United States)

    Christensen, Mette; Andersen, Ole; Banta, Gary T

    2002-07-01

    Absorption and elimination of [(14)C-4,5,9,10]pyrene and production of water-insoluble and water-soluble pyrene metabolites by the polychaetes Nereis diversicolor and Arenicola marina were studied. Both polychaete species were capable of rapidly accumulating and eliminating pyrene. Steady state concentrations of pyrene were established in both polychaete species within 5 days of exposure to contaminated sediments, with A. marina having 5-10 times higher bioaccumulation factors than N. diversicolor. Both water-soluble and water-insoluble metabolites were detected in tissues of N. diversicolor and A. marina. After transferring worms to uncontaminated sediment, about 50% of the body burden of parent pyrene was excreted within 1.5 days, with elimination in A. marina being faster than in N. diversicolor. The only identified water-insoluble metabolite produced by N. diversicolor was 1-hydroxypyrene. Pyrene metabolites were present in A. marina, but could not be identified. Long- and short-term absorption experiments showed an increasing production of water-soluble metabolites over time in the lugworm, which strongly suggests the presence of a PAH metabolising system in A. marina. PMID:12062152

  11. Sensitivity of Coastal Environments and Wildlife to Spilled Oil: Central California: MGT (Management Area Polygons)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains boundaries of Coast Guard facilities; management areas; marinas; marine sanctuaries; national forests; national, regional, and state parks;...

  12. The Importance of Zostera marina to a Local Food Web Based on the Analysis of Compound Specific Isotopes in Maquoit Bay, Gulf of Maine

    Science.gov (United States)

    Doolittle, H. A.; Johnson, B. J.; Ambrose, W. G.; Locke, W.; Harris, C. M.

    2010-12-01

    Zostera marina (also known as eelgrass) is an important primary producer in near shore ecosystems in the Gulf of Maine, providing both habitat and nutrients for a variety of organisms (e.g., crustaceans, polychaetes, gastropods, and fish). The purpose of this study is to use compound specific δ13C analyses of essential amino acids to determine the degree to which organic matter derived from isotopically distinct primary producers (e.g., eelgrass, phytoplankton, and epiphytic algae) contribute to the diets of snails, shrimp, and fish in an eelgrass system in Casco Bay. Maquoit Bay, located in northwestern Casco Bay, in the Gulf of Maine, is a shallow estuarine system that is characterized by silt and clay sized sediments and the presence of extensive eelgrass beds. Amino acid concentrations and δ13C compositions were determined for a variety of sample-types collected in July-August, 2010, from three sites in the study area, including muscle tissue from Tautogolabrus adspersus (cunner), Gasterosteus aculeatus (3-spined stickleback), Nassarius obsoletus (snail), and Mysis spp. (shrimp), seston (i.e., phytoplankton), Z. marina, and epiphytic algae. TFAA amino acid derivatives of the total hydrolyzate were analyzed by GC-FID for amino acid concentration, and by GC-c-IRMS- for carbon isotope composition. Muscle tissue was dominated by glutamic and aspartic acids, and leucine, whereas Zostera marina was dominated by aspartic and glutamic acids, and proline. Phenylalanine and leucine in Z. marina are approximately 10 ‰ enriched in 13C relative to these same amino acids in the seston. The carbon isotope values of these essential amino acids are significantly more enriched in 13C for N. obsoletus than for T. adspersus, G. aculeatus, and Mysis spp. These data suggest that organic matter derived from Z. marina and/or epiphytic algae is more important in the diets of N. obsoletus, and organic matter derived from seston is more important for the diets of T. adspersus, G

  13. 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.

  14. 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. PMID:26752412

  15. 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.

  16. Phytoremediation of Pb by Avicennia marina (Forsk.) Vierh and spatial variation of Pb in the Batticaloa Lagoon, Sri Lanka during driest periods: a field study.

    Science.gov (United States)

    Kularatne, Ranil K A

    2014-01-01

    Batticaloa Lagoon (Sri Lanka) is subjected to significant pollution as a result of anticipated unplanned development works since the cessation of a civil war in May, 2009. This paper presents the effectiveness of Avicennia marina (Forsk.) Vierh in the phytoremediation of Pb and the variation of Pb in sediments and water in the intertidal zone under drier weather conditions. Four pristine areas and 4 mangroves cut areas within the Manmunai North Divisional Secretariat Division/Batticaloa Municipal Council areas were investigated. Pb levels in the sediments and plants were negligible at all locations (i.e., below the method detection limit of the AAS for sediments and plants which is 0.25 mg/kg dry weight and 0.5 mg/kg dry weight, respectively). However, the water environment showed significant contamination (0.17-0.29 mg/L and 0.26-0.34 mg/L in pristine areas and cleared areas, respectively), hence Pb bioaccumulation is likely in fish and other biota. Avicennia marina is not effective to phytoremediate Pb under significant saline conditions. PMID:24912232

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

    DEFF Research Database (Denmark)

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

    Seedling survival and patch establishment is a major bottle-neck for eelgrass (Zostera marina) re-colonization as mortality rates among the young seedlings are high, even in areas where conditions should support survival. We here focus on the potential negative effects of drifting macroalgal mats...... on eelgrass seedling performance. The covering of eelgrass shoots by algae decreases the light availability and may hamper the diffusive movement of oxygen, inorganic carbon and nutrients to and from the shoots. Moreover, the high productivity of the algae can result in large diurnal oxygen...... variations within the mat and periods of anoxia in the lower parts can possibly be followed by release of sulphide from the sediments. We assessed the impact of algae mats on seedling performance and evaluated the relative importance of light attenuation and low oxygen concentrations for seedling growth and...

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

    DEFF Research Database (Denmark)

    Rasmussen, Jonas; Pedersen, Morten Foldager; Olesen, Birgit; Nielsen, Søren Laurentius; Pedersen, Troels Møller

    In a field study we investigated the temporal dynamics of drift-algal assemblages on both small (1 m2) and larger (2500 m2) spatial scales in two shallow (1-3 m) and relatively sheltered locations in Aarhus Bay and Isefjorden, Denmark. Drift-algal cover was estimated every second day in 40...... permanent plots (1 m2) randomly positioned in a 2500 m2 study area during three 8-12 days periods of the growth season. Results show that the algal assemblages were highly dynamic on the small spatial scale as cover within individual plots changed regularly between subsequent observations. The change 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...

  19. Isotopic signatures of eelgrass (Zostera marina L.) as bioindicator of anthropogenic nutrient input in the western Baltic Sea.

    Science.gov (United States)

    Schubert, Philipp R; Karez, Rolf; Reusch, Thorsten B H; Dierking, Jan

    2013-07-15

    Eutrophication is a global environmental problem. Better management of this threat requires more accurate assessments of anthropogenic nitrogen (N) inputs to coastal systems than can be obtained with traditional measures. Recently, primary producer N isotopic signatures have emerged as useful proxy of such inputs. Here, we demonstrated for the first time the applicability of this method using the widespread eelgrass (Zostera marina) in the highly eutrophic Baltic Sea. Spatial availability of sewage N across a bay with one major sewage outflow predicted by eelgrass δ(15)N was high near and downstream of the outflow compared to upstream, but returned to upstream levels within 4 km downstream from the outfall. General conclusions were corroborated by traditional eutrophication measures, but in contrast to these measures were fully quantitative. Eelgrass N isotope ratios therefore show high potential for coastal screens of eutrophication in the Baltic Sea, and in other areas with eelgrass meadows. PMID:23711843

  20. Antifouling paint booster biocides (Irgarol 1051 and diuron) in marinas and ports of Bushehr, Persian Gulf.

    Science.gov (United States)

    Saleh, Abolfazl; Molaei, Saeideh; Sheijooni Fumani, Neda; Abedi, Ehsan

    2016-04-15

    In the present study, antifouling paint booster biocides, Irgarol 1051 and diuron were measured in ports and marinas of Bushehr, Iran. Results showed that in seawater samples taken from ports and marinas, Irgarol was found at the range of less than LOD to 63.4ngL(-1) and diuron was found to be at the range of less than LOD to 29.1ngL(-1) (in Jalali marina). 3,4-dichloroaniline (3,4-DCA), as a degradation product of diuron, was also analyzed and its maximum concentration was 390ngL(-1). Results for analysis of Irgarol 1051 in sediments showed a maximum concentration of 35.4ngg(-1) dry weight in Bandargah marina. A comparison between the results of this study and those of other published works showed that Irgarol and diuron pollutions in ports and marinas of Bushehr located in the Persian Gulf were less than the average of reports from other parts of the world. PMID:26917092

  1. 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.

  2. The radiological exposure of the population of the European Community from radioactivity in North European marine waters Project 'Marina'

    International Nuclear Information System (INIS)

    Project Marina was set up by the Commission of the European Communities in 1985 to look at the radiological impact of radionuclides, both natural and anthropogenic, in northern European marine waters. This paper is a summary of project Marina's work and its conclusions

  3. Principales características hidrogeoquímicas del acuífero de Balerma-Las Marinas (Almería)

    OpenAIRE

    Martínez Vidal, J. L.; Molina, L.; Navarrete, F.; Pulido Bosch, A.

    1990-01-01

    The Balerma-Las Marinas aquifer, which features mainly Pliocene calcarenite rocks, is one of the three distinct hydrogeological units that have been identified in the Campo de Dalías area of Almería. Its hydrogeochemistry has been established by analyzing one hundred and eight samples from different points along the aquifer. The high sodium chloride content of the water is put down to fairly recent relative changes in the sea and continent levels, which have left saline water trappe...

  4. Monitoraggio delle risorse alieutiche con l'ausilio di sistemi informativi geografici in una riserva naturale marina e sito natura 2000.

    OpenAIRE

    Beltrano, Anna Maria

    2008-01-01

    L’obiettivo di tale studio è stato quello di implementare un Sistema di Informazione Geografica (GIS) per il monitoraggio dell’attività di pesca e delle risorse alieutiche, considerando le marinerie delle Isole Egadi, a rappresentanza di alcune tipologie di base dell’attività di pesca artigianale e per i diversi vincoli ambientali che in quest’area insistono quali la Riserva Naturale Marina e i Siti Natura 2000, al fine di suggerire opportune strategie di protezione sia per le risorse pescabi...

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

    OpenAIRE

    Isaiah Nirmal KUMAR; Poliyaparambil Ravi SAJISH; Rita Nirmal KUMAR; George BASIL; Viyol SHAILENDRA

    2011-01-01

    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 popul...

  6. El sistema de áreas naturales protegidas y su rol para la conservación del agua : Aproximación al conocimiento de la presencia de diferentes cuerpos de aguas en el Sistema Provincial de Áreas Naturales Protegidas de la provincia de Buenos Aires

    OpenAIRE

    Romero, María Cristina

    2013-01-01

    El Sistema de Áreas Naturales Protegidas de la Provincia de Buenos Aires (SANP) está regulado por la ley 10907 (B.O. 6/6/90) reglamentada por el decreto 218/94 y modificada por la ley 12.459 (B.O. 26/7/2000). El mismo permite la protección de la biodiversidad de los diferentes ecosistemas de la provincia, a través de la conformación de unidades de conservación funcionales (Reservas Naturales), las que nos brindan servicios ambientales para la sociedad, como protección de sectores de cuencas h...

  7. Do small marinas drive habitat specific impacts? A case study from Mediterranean Sea.

    Science.gov (United States)

    Di Franco, Antonio; Graziano, Mariagrazia; Franzitta, Giulio; Felline, Serena; Chemello, Renato; Milazzo, Marco

    2011-05-01

    Many human activities add new structures to the marine landscape. Despite the fact that human structures cause some inevitable impacts, surprisingly little information exists on the effects of marina on natural marine assemblages. The aim of this paper is to assess habitat-specific response of benthic sessile organisms of rocky shores in relation to the presence of a small marina. Sampling was carried out at three coastal habitats (midshore, lowshore and subtidal) by means of visual censuses adopting an after-control-impact (ACI) experimental design. It appears that the marina affects the structure and composition of benthic communities of both the midshore and the lowshore. Little effect was evident on shallow subtidal assemblage structure. The results of the present study clearly show habitat-specific responses of coastal benthic assemblages to the presence of infrastructure. PMID:21421247

  8. Jenis-Jenis Bakteri Yang Berasosiasi Pada Proses Dekomposisi Serasah Daun Avicennia. Marina (Forsk) Vierh Setelah Aplikasi Fungi Aspergillus SP., Curvularia SP., Penicillium SP. Pada Beberapa Tingkat Salinitas Di Desa Sicanang Belawan

    OpenAIRE

    Wahyuni, Ika

    2011-01-01

    The research on The Variety of Bacteria which Asociated on the Decomposition Process of Avicennia marina Leaf Litter After Aplicated Aspergillus sp., Curvularia sp., and Penicillium sp. in the some Salinity Level had a purpose to know the diversity of bacteria. The research had done at Microbiology Laboratory of FMIPA USU Medan and at the mangrove area of Sicanang-Belawan did began at december 2009 until june 2010. The results of the research indicated that totally 24 species of bacteria whic...

  9. Digestibidade e desempenho produtivo em cabritos mestiços ½ Boer x ½ Saanen alimentados com dietas contendo gordura protegida

    OpenAIRE

    Sérgio Mangano de Almeida Santos; Claudete Regina Alcalde; Ana Paula Silva Possamai; Bruna Susan de Labio Molina; Bruna Hygino; Leiliane Cristine de Souza; Ludmila Couto Gomes; Isabella Ribeiro Ferrari

    2015-01-01

     Objetivou-se com este trabalho, avaliar a ingestão, os parâmetros de desempenho produtivo, a digestibilidade da matéria seca e dos nutrientes de dietas com concentrações crescentes de energia metabolizável contendo gordura protegida, e a análise econômica das dietas para cabritos mestiços ½ Boer x ½ Saanen terminados em confinamento. Foram utilizados 28 cabritos, machos não castrados com peso inicial de 19,02 ± 2,20 kg e idade de 88 ± 5,77 dias, distribuídos em delineamento inteiramente casu...

  10. RPPN, ECO TURISMO, POPULAÇÕES TRADICIONAIS E/OU RESIDENTES: DILEMAS DE UMA POLÍTICA DE ÁREAS PARTICULARES PROTEGIDAS

    OpenAIRE

    Isis Maria Cunha Lustosa

    2005-01-01

    O artigo versa sobre a (UC) Unidade de Conservação– (RPPN) Reserva Particular do Patrimônio Natural e oEcoturismo como elementos de discussão – se há porparte da legislação de áreas protegidas particulares ocompromisso do reconhecimento das populações tradicionaise/ou residentes, bem como da efetiva participaçãodestas na conservação da natureza em RPPN tomando-se como base artigos do Decreto nº 1922/05.06.1996e da Lei nº 9.985/18.07.2000 do (SNUC) Sistema Nacionalde Unidades de Conservação, o...

  11. A gestão pública municipal no desenvolvimento do turismo nas áreas legalmente protegidas de Joinville (SC)

    OpenAIRE

    Vieira, Vinicius Boneli

    2013-01-01

    Resumo: A intensa exploração dos recursos naturais e o aumento freqüente do número de visitantes em áreas naturais têm despertado discussões quanto à dinâmica de gestão e uso destes espaços. O presente estudo tem por objetivo analisar a gestão pública municipal para o desenvolvimento do turismo nas áreas legalmente protegidas de Joinville, localizado na região norte do Estado de Santa Catarina. A análise teórica foi realizada com base nos estudos sobre o uso e gestão dos espaços turísticos, a...

  12. Desempenho de ovelhas da raça Bergamácia alimentadas com dieta contendo gordura protegida Performance of Bergamasca ewes fed diet with bypass fat

    Directory of Open Access Journals (Sweden)

    Rodrigo Martins de Souza Emediato

    2009-09-01

    Full Text Available Objetivou-se com este trabalho avaliar o efeito do uso de gordura protegida na dieta de ovelhas da raça Bergamácia sobre a produção e composição do leite e a dinâmica de peso das ovelhas. Utilizaram-se 77 ovelhas distribuídas em 2 grupos de forma homogênea por ordem de parição e idade, mantidas com uma dieta controle, com silagem de milho e concentrado, ou com a dieta controle contendo gordura protegida (35 g/ovelha.dia adicionada ao concentrado. As dietas foram isoenergéticas e isoproteicas e continham 16% PB e 70% NDT na matéria seca. Durante o dia, os cordeiros eram mantidos com suas mães em pasto, à noite eram separados e retornavam à suas mães após a ordenha matinal; foram desmamados aos 45 dias de idade. As ovelhas, após 48 horas do parto, foram ordenhadas mecanicamente uma vez ao dia, às 7 h, e sua produção de leite foi mensurada diariamente durante 60 dias. Amostras de leite foram coletadas semanalmente para determinação dos teores de proteína e gordura. A dieta com gordura protegida proporcionou maior produção média diária de leite após a desmama dos cordeiros (0,531 vs 0,489 kg/animal.dia. Entretanto, a produção de todo o período não diferiu entre as dietas (0,468 vs 0,453 kg/animal.dia, com gordura protegida e controle, respectivamente. As produções de leite corrigidas para 6,5% de gordura e para 6,5% de gordura e 5,8% de proteína foram semelhantes entre as dietas.The objective of this study was to observe the effect of using bypass fat in the diet of Bergamasca ewes on milk yield, milk composition and ewe weight dynamics. Seventy seven ewes were distributed in two homogeneous groups, according to lambing order and age fed a control diet with corn silage and concentrate; or with a control diet with bypass fat (35 g/ewe/day added to the concentrate. The diets were isoenergetic and isonitrogenous, presenting 16% CP and 70% TDN on dry matter basis. The lambs stayed with their mothers in pastures

  13. 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.

  14. 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, III; 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.

  15. 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...... in lactate and pyruvate and an increase in alanine, GABA and succinate. This reprogramming of the metabolome after 21 h under anoxia indicates a possible mitigation mechanism to avoid the toxic effects of anoxia. A pathway enrichment analysis proposes the alanine shunt, the GABA shunt and the 2...

  16. Nuovi dati e argomenti per Ostia tardoantica dal Progetto Ostia Marina

    OpenAIRE

    David, Massimiliano; Carinci, Mauro; Graziano, Stella Maria; Togni, Stefano; Pellegrino, Angelo; Turci, Marcello

    2014-01-01

    Nuove ricerche condotte dal Dipartimento di Storia, Culture e Civiltà dell’Università di Bologna nell’ambito del « Progetto Ostia Marina » sono attualmente in corso nel quartiere fuori porta Marina dell'antica città costiera di Roma, un settore extraurbano che sta rivelando un notevole potenziale informativo. È stato per ora possibile documentare diversi momenti della vita della città (I-VI sec. d.C.), così come i tempi di abbandono e di decomposizione del tessuto urbano (VII-XVIII sec.). Il ...

  17. Evaluación del Potencial Bioactivo de las Esponjas Marinas Myrmekioderma gyroderma y Topsentia ophiraphidites

    OpenAIRE

    Blandón García, Lina Marcela

    2012-01-01

    A partir de las esponjas marinas se han obtenido gran cantidad de sustancias con potencial antitumoral. En este estudio se realizó la evaluación de la actividad citotóxica, de fracciones de las esponjas marinas Topsentia ophiraphidites y Myrmekioderma gyroderma en dos líneas celulares (Jurkat y CHO). Sólo la fracción T4 de Topsentia ophiraphidites presentó actividad citotóxica, por lo que se le realizaron ensayos posteriores de genotoxicidad y efectos sobre el ciclo celular, resultando crónic...

  18. 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

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

    OpenAIRE

    NÍNIVE ESPINOZA-RODRÍGUEZ; JOANMYRA CARRASQUERO; KAREEN DE TURRIS-MORALES; GABRIELA DELGADO-ORTEGA; HÉCTOR BARRIOS-GARRIDO

    2015-01-01

    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 ...

  20. The effects of coal dust on photosynthetic performance of the mangrove, Avicennia marina in Richards Bay, South Africa

    International Nuclear Information System (INIS)

    Richards Bay, on the northern KwaZulu-Natal coast, is the largest coal exporting port in South Africa. The coal is stored at the Richards Bay Coal Terminal (RBCT) prior to export. Dust from coal operations is a major problem in the Richards Bay area. In this study, we tested the hypothesis that coal dust adversely affects photosynthetic performance of Avicennia marina (Forssk.) Vierh., the dominant mangrove species in the harbour. Photosynthetic performance was determined on 10 trees by measuring carbon dioxide uptake and chlorophyll fluorescence parameters at two elevation sites and on upper and lower leaf surfaces that were covered or uncovered with coal dust. Measurements were made on five clear, sunny days at saturating light (>1000 μmol m-2s-1) and high temperature (28-30 deg. C). Coal dust significantly reduced carbon dioxide exchange of upper and lower leaf surfaces by 17-39%, the reduction being generally greater on the lower leaf surface that is covered by a dense mat of trichomes and salt glands. The reduction in carbon dioxide exchange by coal dust was higher at the high elevation site that supported isolated dwarfed trees. The chlorophyll fluorescence data indicated that leaves coated with dust exhibited significantly lower photosystem II (PS II) quantum yield, lower electron transport rate (ETR) through PSII and reduced quantum efficiency of PSII (FvFm). The chlorophyll fluorescence data supported the gas exchange measurements and are consistent with reduced photosynthetic performance of leaves coated with coal dust. - Coal dust reduced photosynthetic performance of the mangrove, Avicennia marina

  1. 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

  2. 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

  3. Physiological responses of Zostera marina and Cymodocea nodosa to light-limitation stress.

    Directory of Open Access Journals (Sweden)

    João Silva

    Full Text Available 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.

  4. Possibilities for restoration of Zostera marina beds in the Dutch Wadden Sea

    NARCIS (Netherlands)

    Katwijk, Margaretha Maria van

    2000-01-01

    The Wadden Sea lost its economically valuable seagrass (Zostera marina) beds during the 1930s. The beds never recovered and only sparse beds remain around mean sea level. As the conditions in the Dutch Wadden Sea have improved since the late 1980s (improved water quality, local prohibition of fisher

  5. Biochemical characterization of the eelgrass Zostera marina at its southern distribution limit in the North Pacific

    Science.gov (United States)

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

    2004-01-01

    The eelgrass Zostera marina L. is distributed along the Baja California Peninsula (Mexico) where it is exposed to a wide range of irradiances and temperatures that could promote changes in its biochemical composition. Consequently, the objective of this study was to characterize the variations in the levels of chlorophyll, carbohydrates, proteins, fiber, ash and calories in the shoots of Z. marina from the north (San Quintin) and south (Ojo de Liebre and San Ignacio lagoons) of the peninsula. Temperature in the southern lagoons was 5-6??C higher than in the northern lagoon; likewise, in situ irradiance was two-fold greater in the south than in the north. As a result of the lower irradiance levels, the concentration of chlorophyll in the shoots of Z. marina was twice as high (1.7 mg gWW-1) in the northern lagoon than in the southern ones (0.8 mg gWW-1). Similar to chlorophyll levels, the concentration of soluble carbohydrates in the shoots was greater in the northern lagoon than in the southern ones, suggesting that the high levels of chlorophyll are enough to compensate for the low irradiance levels and to maintain a positive carbon balance at San Quintin. On the other hand, the levels of proteins in the shoots from the north of the peninsula were slightly lower than those from the southern populations. In general, these results suggest that the different environmental conditions to which Z. marina is exposed along the peninsula impact its biochemical composition.

  6. 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 stres...

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

    International Nuclear Information System (INIS)

    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. 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.

  9. 18 CFR 1304.403 - Marina sewage pump-out stations and holding tanks.

    Science.gov (United States)

    2010-04-01

    ...; (c) Available fresh water facilities for tank flushing; (d) Check valve and positive cut-off or other... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Marina sewage pump-out stations and holding tanks. 1304.403 Section 1304.403 Conservation of Power and Water Resources...

  10. 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.

  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. Toads on Lava: Spatial Ecology and Habitat Use of Invasive Cane Toads (Rhinella marina in Hawai'i.

    Directory of Open Access Journals (Sweden)

    Georgia Ward-Fear

    Full Text Available Most ecological research on cane toads (Rhinella marina has focused on invasive populations in Australia, ignoring other areas where toads have been introduced. We radio-tracked and spool-tracked 40 toads, from four populations on the island of Hawai'i. Toads moved extensively at night (mean 116 m, from spool-tracking but returned to the same or a nearby retreat-site each day (from radio-tracking, mean distance between successive retreat sites 11 m; 0 m for 70% of records. Males followed straighter paths during nocturnal movements than did females. Because moist sites are scarce on the highly porous lava substrate, Hawai'ian toads depend on anthropogenic disturbance for shelter (e.g. beneath buildings, foraging (e.g. suburban lawns, golf courses and breeding (artificial ponds. Foraging sites are further concentrated by a scarcity of flying insects (negating artificial lights as prey-attractors. Habitat use of toads shifted with time (at night, toads selected areas with less bare ground, canopy, understory and leaf-litter, and differed between sexes (females foraged in areas of bare ground with dense understory vegetation. Cane toads in Hawai'i thrive in scattered moist patches within a severely arid matrix, despite a scarcity of flying insects, testifying to the species' ability to exploit anthropogenic disturbance.

  13. Toads on Lava: Spatial Ecology and Habitat Use of Invasive Cane Toads (Rhinella marina) in Hawai’i

    Science.gov (United States)

    Ward-Fear, Georgia; Greenlees, Matthew J.; Shine, Richard

    2016-01-01

    Most ecological research on cane toads (Rhinella marina) has focused on invasive populations in Australia, ignoring other areas where toads have been introduced. We radio-tracked and spool-tracked 40 toads, from four populations on the island of Hawai’i. Toads moved extensively at night (mean 116 m, from spool-tracking) but returned to the same or a nearby retreat-site each day (from radio-tracking, mean distance between successive retreat sites 11 m; 0 m for 70% of records). Males followed straighter paths during nocturnal movements than did females. Because moist sites are scarce on the highly porous lava substrate, Hawai’ian toads depend on anthropogenic disturbance for shelter (e.g. beneath buildings), foraging (e.g. suburban lawns, golf courses) and breeding (artificial ponds). Foraging sites are further concentrated by a scarcity of flying insects (negating artificial lights as prey-attractors). Habitat use of toads shifted with time (at night, toads selected areas with less bare ground, canopy, understory and leaf-litter), and differed between sexes (females foraged in areas of bare ground with dense understory vegetation). Cane toads in Hawai’i thrive in scattered moist patches within a severely arid matrix, despite a scarcity of flying insects, testifying to the species’ ability to exploit anthropogenic disturbance. PMID:27027738

  14. Brown: A Taxonomic Analysis of Avian Faunal Remains from Three Sites in Marina Del Rey, Los Angeles County, California

    OpenAIRE

    Fenenga, Gerrit L

    1990-01-01

    A Taxonomic Analysis of Avian Faunal Remains from Three Sites in Marina Del Rey. Los Angeles County, California Joan C. Brown. Coyote Press Archives of California Prehistory No. 30, vii + 71 pp., 8 tables, appendix, 1989, $6.20 (paper).

  15. Growth responses of the mangrove Avicennia marina to salinity: development and function of shoot hydraulic systems require saline conditions

    OpenAIRE

    Hoa T. Nguyen; Stanton, Daniel E.; Schmitz, Nele; Farquhar, Graham D.; Ball, Marilyn C.

    2015-01-01

    Background and Aims Halophytic eudicots are characterized by enhanced growth under saline conditions. This study combines physiological and anatomical analyses to identify processes underlying growth responses of the mangrove Avicennia marina to salinities ranging from fresh- to seawater conditions.

  16. Identificación de los residuos sólidos generados por el turismo dentro de un área natural protegida: caso Parque de los Venados

    Directory of Open Access Journals (Sweden)

    Amanda Legorreta Ramírez

    2011-01-01

    Full Text Available Los residuos sólidos dentro de las Áreas Naturales Protegidas (ANP son considerados una de las principales consecuencias negativas derivadas de la actividad turística, debido a que atentan contra la belleza del paisaje, además de representar daños potenciales a las especies animales y vegetales existentes. El objetivo de este trabajo es conocer los tipos de residuos que se generan en el Parque de los Venados, para llevar a cabo esto, se realizó un trabajo de campo que permitiera identificar los tipos y cantidades de residuos, asimismo, se consultaron las Normas Oficiales Mexicanas recomendadas para este tipo de análisis, de igual manera, como parte de los objetivos del trabajo se identificaron tres fuentes generadoras de residuos dentro del Parque, en cada una de ellas se realizó el muestreo, caracterización por subproductos y determinación de peso volumétrico. Finalmente, los resultados obtenidos se compararon con los datos reportados en la literatura para las zonas rurales y urbanas del país, en especial con los de la zona urbana de Toluca, con el objetivo de encontrar semejanzas entre los patrones de composición de los residuos de estas zonas y los encontrados en el Parque de los Venados. Este trabajo representa un primer esfuerzo en la identificación y análisis de la composición de residuos, dentro de un Área Natural Protegida (ANP, generados por la actividad turística, la aplicación de la metodología marcada por las Normas Oficiales y su adecuación a este análisis específico forman parte también de los objetivos perseguidos por la investigación, que es el conocimiento de la normatividad que involucra a las ANP, el turismo y los residuos sólidos.

  17. Monitorización de variables medioambientales y energéticas en la construcción de viviendas protegidas: Edificio Cros-Pirotecnia en Sevilla

    Directory of Open Access Journals (Sweden)

    León, A. L.

    2010-09-01

    Full Text Available This work is part of the research project known as Efficacia: Reduction of energy consumption and environmental impact of the construction of subsidised housing in Andalusia. The aim of this project is the study of the subsidised housing building Cros-Pirotecnia, located in the “Pirotecnia” neighbourhood of the South District of the city of Seville. One of the objectives of this work is to establish the energy demand and consumption, in real time, of this set of leased housing. The results of the monitoring implemented to take into account the influence of its inhabitants has been complemented with a series of questionnaires on the consumption habits of its tenants. This article describes the methodology employed for the monitoring and presents the main results obtained, once twelve months have elapsed from the start of the measurement period, as well as the most significant results of the questionnaires carried out among the tenants of these buildings.

    Este trabajo forma parte del proyecto de investigación Efficacia: Reducción del consumo energético y del impacto ambiental en la construcción de viviendas protegidas en Andalucía. Dicho proyecto tiene como objeto de estudio el edificio de viviendas protegidas de Cros-Pirotecnia, emplazado en el Barrio “Pirotecnia” del Distrito Sur de la ciudad de Sevilla. Uno de los objetivos de este trabajo es conocer la demanda y consumo energético, en tiempo real, de este conjunto de viviendas en régimen de alquiler. Para tener en cuenta la influencia de sus habitantes, los resultados obtenidos mediante la instalación de monitorización se ha complementado con una serie de encuestas sobre los hábitos de consumos de sus inquilinos. En este artículo se describe la metodología empleada para la monitorización y se presentan los principales resultados obtenidos, una vez transcurridos doce meses desde el comienzo del período de medida. Asimismo, se ofrecen los resultados m

  18. Draft Genome Sequences of Two Pseudoalteromonas Strains Isolated from Roots and Leaf Blades of the Seagrass Zostera marina.

    Science.gov (United States)

    Alexiev, Alexandra; Krusor, Megan L; Jospin, Guillaume; Lang, Jenna M; Eisen, Jonathan A; Coil, David A

    2016-01-01

    Here, we present the draft genome sequences for Pseudoalteromonas sp. strain UCD-33C and Pseudoalteromonas lipolytica UCD-48B. Pseudoalteromonas sp. UCD-33C was isolated from Zostera marina roots and P. lipolytica UCD-48B from Z. marina leaf blades, both collected in Woods Hole, MA. These assemblies contain 4,479,285 bp and 4,592,435 bp, respectively. PMID:26893412

  19. Protected areas in mountains

    Directory of Open Access Journals (Sweden)

    Hamilton, L. S.

    2006-12-01

    Full Text Available

    The importance of a global Protected Areas Network in sustaining appropriate mountain development is presented in this paper. Present status of the world’s “official” Protected Areas in the UN List, and the proportion that are in mountain areas, and including international designations (World Heritage and Biosphere Reserves. Current and future challenges in the management of these special areas are also commented.



    El autor destaca la importancia de una Red Mundial de Espacios Protegidos para el desarrollo sostenible de las montañas. Comenta luego el estatus actual de las Áreas Protegidas “oficiales” del Mundo en la Lista de las Naciones Unidas y qué proporción de ellas forma parte de las montañas, sin olvidar las figuras internacionales de protección como Patrimonio de la Humanidad y Reservas de Biosfera. Para terminar, se discuten los problemas de gestión actuales y futuros de estas áreas tan especiales

  20. 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.

  1. Effects of light intensities and photoperiods on growth and proteolytic activity in purple non-sulfur marine bacterium, Afifella marina strain ME (KC205142)

    OpenAIRE

    Sujjat Al-Azad; Tan Kar Soon; Julian Ransangan

    2013-01-01

    Afifella marina strain ME (KC205142), a purple non-sulfur bacterium was isolated from mangrove habitats of Sabah. The effects of light intensities and photoperiods on proteolytic activity in Afifella marina strain ME (KC205142) were investigated. Secretion of proteolytic enzymes in Afifella marina was preliminarily assessed by skim milk agarose media. Subsequently, light intensities, such as, dark, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 and 5000 lux were used to ev...

  2. 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...... 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....

  3. Efecto de la suplementación con grasa protegida sobre la producción y calidad de carne de toretes mexicanos doble propósito

    Directory of Open Access Journals (Sweden)

    German Mendoza M

    2011-04-01

    Full Text Available Objetivo. Evaluar la respuesta productiva y calidad de la carne de toretes doble propósito a la adición de grasa protegida (GP en su dieta. Materiales y métodos. Se utilizaron 45 toretes comerciales (B. taurus x B. indicus, divididos en tres bloques de 15 animales, de acuerdo con su peso vivo en pequeños, medianos y grandes. Cada bloque fue dividido en tres subgrupos de 5 animales, asignados aleatoriamente a los tratamientos 0, 1.5 y 3% de GP, en un diseño de bloques completamente al azar. Resultados. No hubo diferencias (p>0.05 en comportamiento productivo. La grasa dorsal fue mayor (p0.05 en área del ojo de la costilla (AC ni pH de la carne. El contenido de proteína cruda de la carne incrementó (p0.05 entre tratamientos. Conclusiones. Adicionar GP a dietas para bovinos doble propósito en finalización no modificó la respuesta productiva, pero mejoró algunas características de la canal y de la carne. Se sugiere realizar más investigación, utilizando el mismo tipo de animales, con niveles mayores de GP a los usados en este estudio, ya que la respuesta pudiera mejorar.

  4. Denominaciones De Origen Protegidas (D.O.P. Y Turismo Gastronómico: Una Relación Simbiótica En Andalucía

    Directory of Open Access Journals (Sweden)

    EMILIO J. MORALES-FERNÁNDEZ

    2013-01-01

    Full Text Available El turismo gastronómico es una modalidad emergente de turismo muy demandada en la primera década del siglo XXI en la que el turista busca degustar los productos alimenticios típicos de la zona geográfica que visita, conocer el proceso productivo y disfrutar del patrimonio cultural y culinario de esos lugares. Este trabajo presenta un análisis de la relación entre los productos alimenticios asociados a denominaciones de origen e indicaciones geográficas protegidas (D.O.P. e I.G.P. y la potencialidad del turismo gastronómico. Se revisan las ventajas e inconvenientes que aporta el desarrollo del turismo gastronómico en Andalucía mediante un análisis DAFO. Destacan las rentas complementarias a las actividades agrícolas que generan este tipo de turismo, la puesta en valor del potencial turístico de zonas rurales y la conciliación de intereses de entidades públicas y privadas afectadas.

  5. Antibacterial activity of extracts from Zostera marina against pathogens of Apostichopus japonicus skin ulceration disease

    Science.gov (United States)

    Liu, Yang; Jiang, Guoliang; Wu, Zhiqiang

    2010-03-01

    The purpose of this study was to investigate the antibacterial activity of extracts from Zostera marina against the pathogens of Apostichopus japonicus skin ulceration disease. When 95% ethanol (v/v) solvent was used to extract Zostera marina at 50°C, aqueous extract (ZA) showed obvious bacteriostatic effects on the tested bacterial strains (inhibition halo diameters between 8.23 mm and 13.62 mm), whereas the ethyl acetate extract (ZE) was almost inactive. The minimal inhibitory concentration (MIC) of ZA against four pathogens were homogeneous at 12.8 g L-1. ZA components were analyzed by thin layer chromatography (TLC) assay and six fractions were obtained. In another study, the six fractions showed inhibitory effects against the tested bacteria while their functions seemed to counteract the ZA activity.

  6. 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

    the sediment, and aquatic plants differ in aerenchymal volume and resistance to O2 diffusion through the plant and across leaf and root surfaces. The hypothesis that the freshwater isoetid Lobelia dortmanna and the marine seagrass Zostera marina should display pronounced contrasts in intra-plant O2......-sections of the aerenchyma. The major exchange of O2 across roots of L. dortmanna can be accounted for by small intra-plant resistances to diffusion, larger root than leaf surfaces, and greater radial diffusive resistance of leaves than roots. In contrast, the major O2 exchange across leaves than roots of Z...... photosynthetic O2 from roots and low O2 consumption of sediments means that sediment, aerenchyma and water are important O2 sources for respiration during the following night, while Z. marina relies on the water column as the sole source of O2 because its sediments are anoxic. These differences between L...

  7. Aesthetic experience in performance art : Marina Abramović the artist is present

    OpenAIRE

    Kırmızı, Defne

    2013-01-01

    This thesis explores the possibility of an embodied, corporeal and transforming aesthetic experience that performance art may reveal. The artistic practice of Marina Abramović, who witnessed and pioneered the paradigm shifts in the performance art sphere, will be examined in conjunction with the performative turn and affective turn that art has been going through. In addition to a comprehensive overview of the former academic studies done on Abramović’s body of work, her latest...

  8. Possibilities for restoration of Zostera marina beds in the Dutch Wadden Sea

    OpenAIRE

    Katwijk, Margaretha Maria van

    2000-01-01

    The Wadden Sea lost its economically valuable seagrass (Zostera marina) beds during the 1930s. The beds never recovered and only sparse beds remain around mean sea level. As the conditions in the Dutch Wadden Sea have improved since the late 1980s (improved water quality, local prohibition of fisheries activities), the University of Nijmegen and Rijkswaterstaat have initiated investigations on the possibilities for restoration of the beds. In this study, it was concluded that potential Zoster...

  9. Oxygen and capacity limited thermal tolerance of the lugworm Arenicola marina: A seasonal comparison

    OpenAIRE

    Schröer, Mareike; Saphörster, Julia; Bock, Christian; Pörtner, Hans-Otto

    2011-01-01

    Lugworms Arenicola marina were collected from Arcachon Bay in two summers and winters of consecutive years. The worms were acclimated to different temperatures (5 and 10 °C for winter animals and 15 °C for summer animals). Each group was investigated over an experimental temperature range concerning its optimum in exercise performance, acute growth rate as well as respiration and ventilation activities to reveal seasonal acclimatisation effects, potential inter-annual differences ...

  10. Four New Jacaranone Analogs from the Fruits of a Beibu Gulf Mangrove Avicennia marina

    Directory of Open Access Journals (Sweden)

    Xiang-Xi Yi

    2014-04-01

    Full Text Available Four new jacaranone analogs, marinoids F–I (1–4, were isolated from the fruits of a Beibu Gulf mangrove Avicennia marina. The structures were elucidated based on analysis of spectroscopic data. Marinoids F and G are shown to be diastereoisomers of chlorocornoside, a new halogen containing marine secondary metabolite. The antioxidant activity of the isolates was evaluated using a cellular antioxidant assay, and 4 showed good antioxidant activity (EC50 = 26 μM.

  11. Effects on cellular energy allocation and total oxyradical capacity in contamination exposed Arenicola marina

    OpenAIRE

    2009-01-01

    Sediment in Frierfjord, Southern Norway is polluted by heavy metals, PAH, PCB, dibenzo-p-dioxins and dibenzofurans. Levels of toxicity in sediment cannot be determined through chemical analyses alone due to biological, chemical and physical interactions with the sediment and biota. This study aimed to assess toxicity through exposure of Arenicola marina to the sediment. Sub-lethal effects in oxidative stress resistance (total oxyradical scavenging capacity- TOSC) and alterations to the energy...

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

    OpenAIRE

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

    2014-01-01

    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 este...

  13. Use of passive samplers in pollution monitoring: a numerical approach for marinas.

    Science.gov (United States)

    Yılmaz, A; Karacık, B; Henkelmann, B; Pfister, G; Schramm, K-W; Yakan, S D; Barlas, B; Okay, O S

    2014-12-01

    Triolein-containing semipermeable membrane devices (SPMDs) and butyl rubber (BR) based sorbents were employed as passive samplers in 14 coastal stations of Turkey including shipyards and marinas to characterize time-integrated levels of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) and their relationship to potential pollution sources. Passive samplers of SPMDs and BR sorbents were deployed for 30days in the spring of 2012. The maximum concentrations of total PAH and PCB compounds sequestered by SPMDs were 3338 ng g(-1) SPMD and 4247 pg g(-1) SPMD. (END)-I and DDT-related compounds were dominant OCP compounds for most of the sites in passive samplers. Total PAH concentrations in SPMDs were found 1.2 to 8 times higher than the concentrations in BRs. However, BR sorbents were able to sample some PAHs which could not be sampled by SPMDs. The concentrations of PCBs and OCPs in BRs were similar or higher than SPMDs. SPMD-data were used to estimate the average ambient water concentrations of the contaminants. Two existing theoretical approaches have been used to derive the concentrations of hydrophobic pollutants in the ambient waters. The results were found very similar and range from 7318 to 183864 pg L(-1) for PAHs, from 2 to 186 pg L(-1) for PCBs, and from 98 to 848 pg L(-1) for OCPs. Furthermore, a simple numerical model was designed to estimate the boat-related water concentrations in marinas by using the seawater data supplied by SPMDs. The model was mainly built on the water concentration and the capacities of a particular marina and then applied to two sites in the second marina. A good correlation was found between the model outputs and SPMD-water data. PMID:25108068

  14. Fungi and Bacteria in or on Leaves of Eelgrass (Zostera marina L.) from Chesapeake Bay †

    OpenAIRE

    Newell, Steven Y.

    1981-01-01

    Samples of green and brown leaves of eelgrass (Zostera marina L.) were incubated in seawater without an additional carbon source. Parallel leaf samples were used for acridine orange bacterial counting and water-soluble aniline blue estimation of fungal biovolume. The incubations produced no evidence that there is an eelgrass counterpart for the chytridialean symbiont which is very common in turtlegrass (Thalassia testudinum König). Sterile mycelium (i.e., living mycelium without identifiable ...

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

    International Nuclear Information System (INIS)

    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 IC50 of 5 μg l-1 for propionylcholinesterase (PChE). PChE was significantly inhibited in vivo after a 10 day exposure to 100 μg l-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

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

    KAUST Repository

    Alzubaidy, Hanin

    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.

  17. 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. PMID:26475934

  18. The cryptofauna of Zostera marina (L.): Abundance, biomass and population dynamics

    Science.gov (United States)

    Pihl Baden, Susanne

    Cryptofauna (epifauna passing a 2-mm but retained on a 0.2-mm mesh sieve) of Zostera marina on the Swedish west coast (58°N, 11°E) is dominated by crustaceans, mainly detritivorous tube-building amphipods and harpacticoids. Abundance and biomass of amphipods in two relatively unpolluted Z. marina beds were higher than any data from the literature, with maximum abundance of 80·10 3 ind·m -2 and 1 g AFDW·m -2 bottom. This is at least partly due to the small mesh size used in this investigation. The recruitment of the crustaceans started in late June and was continuous through the rest of the season, whereas the recruitment of the molluscs peaked in late June and July. In a Z. marina bed (Rixö) located 2 km from an oil refinery, the seasonal abundance of amphipods was 15% of the abundance in the other beds, whereas the remaining fauna had about the same density. In Rixö the percentage of female amphipod with empty brood pouches increased during the season. It is suggested that low abundances and fecundity of amphipods in Rixö could result from oil pollution.

  19. A Zostera marina manganese superoxide dismutase gene involved in the responses to temperature stress.

    Science.gov (United States)

    Liu, Jiao; Tang, Xuexi; Wang, You; Zang, Yu; Zhou, Bin

    2016-01-10

    Superoxide dismutase (SOD) is an essential enzyme playing a pivotal role in the protection mechanism against oxidative stress by reducing superoxide radicals. In the present study, the full-length cDNA sequence of manganese superoxide dismutase was identified from Zostera marina (ZmMnSOD) via raid amplification of cDNA ends (RACE) technique and expressed sequence tags (ESTs) analysis. The open reading frame (ORF) encoded a polypeptide of 254 amino acid residues, which shared 69%-77% similarity with previous identified SODs. Analysis of the deduced amino acid revealed conserved features, including functional domains, signature motifs and metal binding sites. Phylogenetic analysis revealed that ZmMnSOD was closer to the SODs from angiosperm than those from other organisms. The mRNA expression level of ZmMnSOD at different temperatures was investigated using real-time PCR and it was significantly up-regulated from 5°C to 15°C, and then dramatically down-regulated. The recombinant ZmMnSOD protein was purified and exhibited Mn(2+) ions dependency specific enzymatic activity and strong antioxidant activity over a wide temperature range. All these results indicate that ZmMnSOD is an authentic member of the plant SOD family and may play important roles in minimizing the effect of oxidative damage in Z. marina against temperature stress and affect the adaptability of Z. marina to global warming. PMID:26410038

  20. Algunos digéneos de Rhinella marina (Anura: Bufonidae en Colombia Some digeneans of Rhinella marina (Anura: Bufonidae in Colombia

    Directory of Open Access Journals (Sweden)

    Mauricio Bechara

    2010-04-01

    Full Text Available Se estudiaron 40 sapos Rhinella marina Linnaeus, 1758 (24 machos y 16 hembras del Valle de Aburrá, Antioquia, Colombia, 8 de los cuales se encontraron parasitados por 2 especies de digéneos: Pseudosonsinotrema chabaudi (Caballero y Caballero, 1969 Sullivan, 1974 (Pleurogenidae (primer registro para Colombia y para el hospedero y Mesocoelium monas (Rudolphi, 1819 Freitas, 1958 (Brachycoeliidae, previamente registrado para este país. De las 2 especies de helmintos recolectadas, la que alcanzó los mayores niveles de prevalencia (40% y abundancia media (14.7 fue P. chabaudi en San Antonio de Prado, y la intensidad promedio más elevada fue para M. monas, en los sapos de Barbosa (46.7.Eight of 40 Rhinella marina Linnaeus, 1758 (24 males and 16 females from Aburrá Valley, Antioquia, Colombia, were infected with 2 digenea species: Pseudosonsinotrema chabaudi (Caballero y Caballero, 1969 Sullivan, 1974 (Pleurogenidae, which represents new host and country records, and Mesocoelium monas (Rudolphi, 1819 Freitas, 1958 (Brachycoeliidae, which was previously reported for the country. Pseudosonsinotrema chabaudi in San Antonio de Prado reached the highest prevalence levels (40% and mean abundance (14.7, whereas the highest mean intensity was recorded for M. monas in cane toads from Barbosa (46.7.

  1. 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

  2. De novo assembly and characterization of the transcriptome of seagrass Zostera marina using Illumina paired-end sequencing.

    Directory of Open Access Journals (Sweden)

    Fanna Kong

    Full Text Available BACKGROUND: The seagrass Zostera marina is a monocotyledonous angiosperm belonging to a polyphyletic group of plants that can live submerged in marine habitats. Zostera marina L. is one of the most common seagrasses and is considered a cornerstone of marine plant molecular ecology research and comparative studies. However, the mechanisms underlying its adaptation to the marine environment still remain poorly understood due to limited transcriptomic and genomic data. PRINCIPAL FINDINGS: Here we explored the transcriptome of Z. marina leaves under different environmental conditions using Illumina paired-end sequencing. Approximately 55 million sequencing reads were obtained, representing 58,457 transcripts that correspond to 24,216 unigenes. A total of 14,389 (59.41% unigenes were annotated by blast searches against the NCBI non-redundant protein database. 45.18% and 46.91% of the unigenes had significant similarity with proteins in the Swiss-Prot database and Pfam database, respectively. Among these, 13,897 unigenes were assigned to 57 Gene Ontology (GO terms and 4,745 unigenes were identified and mapped to 233 pathways via functional annotation against the Kyoto Encyclopedia of Genes and Genomes pathway database (KEGG. We compared the orthologous gene family of the Z. marina transcriptome to Oryza sativa and Pyropia yezoensis and 11,667 orthologous gene families are specific to Z. marina. Furthermore, we identified the photoreceptors sensing red/far-red light and blue light. Also, we identified a large number of genes that are involved in ion transporters and channels including Na+ efflux, K+ uptake, Cl- channels, and H+ pumping. CONCLUSIONS: Our study contains an extensive sequencing and gene-annotation analysis of Z. marina. This information represents a genetic resource for the discovery of genes related to light sensing and salt tolerance in this species. Our transcriptome can be further utilized in future studies on molecular adaptation to

  3. Isotopic signatures of eelgrass (Zostera marina L.) as bioindicator of anthropogenic nutrient input in the western Baltic Sea

    International Nuclear Information System (INIS)

    Highlights: • Anthropogenic nitrogen (N) inputs are a global problem, but difficult to quantify. • We tested the use of eelgrass δ15N as proxy of such inputs in the Baltic Sea. • The method revealed distinct spatial patterns in sewage N across a eutrophic bay. • Traditional eutrophication measures corroborated the results from δ15N values. • Eelgrass δ15N ratios have high potential as proxy of sewage-derived N in the Baltic. -- Abstract: Eutrophication is a global environmental problem. Better management of this threat requires more accurate assessments of anthropogenic nitrogen (N) inputs to coastal systems than can be obtained with traditional measures. Recently, primary producer N isotopic signatures have emerged as useful proxy of such inputs. Here, we demonstrated for the first time the applicability of this method using the widespread eelgrass (Zostera marina) in the highly eutrophic Baltic Sea. Spatial availability of sewage N across a bay with one major sewage outflow predicted by eelgrass δ15N was high near and downstream of the outflow compared to upstream, but returned to upstream levels within 4 km downstream from the outfall. General conclusions were corroborated by traditional eutrophication measures, but in contrast to these measures were fully quantitative. Eelgrass N isotope ratios therefore show high potential for coastal screens of eutrophication in the Baltic Sea, and in other areas with eelgrass meadows

  4. 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.

  5. Silicon alleviates cadmium toxicity in Avicennia marina (Forsk.) Vierh. seedlings in relation to root anatomy and radial oxygen loss

    International Nuclear Information System (INIS)

    Highlights: • The inhibition of growth of Avicennia marina due to Cd was alleviated by Si. • Si prompted the development of the apoplastic barrier in the roots. • Si increased the amount of ROL and the degree of Mn plaque. -- Abstract: The effects of Si on growth, the anatomy of the roots, radial oxygen loss (ROL) and Fe/Mn plaque on the root surface were investigated in Avicennia marina (Forsk.) Vierh. seedlings under Cd stress. Si prompted the growth of seedlings and reduced the Cd concentration in the root, stem and leaf of A. marina. Si prompted the development of the apoplastic barrier in the roots, which may be related to the reduction of Cd uptake. The higher amount of ROL and Mn plaque on the root surface due to Si were also related to the promotion of Cd tolerance in A. marina seedlings. Therefore, it is concluded that the alteration of the anatomy of the roots, the increase of ROL and Mn plaque of A. marina seedlings play an important role in alleviation of Cd toxicity due to Si

  6. Las áreas naturales protegidas y la investigación ecológica de largo plazo en México

    Directory of Open Access Journals (Sweden)

    M. Maass

    2010-01-01

    Full Text Available Detrás de la actual crisis ambiental está nuestra limitada comprensión de los procesos ecológicos y sociales que operan a escalas espaciotemporales amplias. Esta falta de conocimiento ha desencadenado fallos en los esquemas de manejo y utilización de los servicios y recursos que nos brindan los ecosistemas naturales, lo que a su vez ha provocado su deterioro a escalas globales. Una respuesta de la comunidad académica a este vacío del conocimiento ha sido la formación de grupos de científicos comprometidos con la investigación y seguimiento de procesos ecológicos de largo plazo (LTER. La Red Mexicana LTER está conformada por 10 grupos que realizan investigación en diferentes áreas naturales protegidas (ANP del país. Los grupos LTER se han beneficiado de la existencia de ecosistemas bien conservados y de las condiciones óptimas que les aseguran la continuidad de sus observaciones. Las ANP, por su parte, se han favorecido por la generación de información científica, muy útil a la hora de diseñar e implementar sus programas de manejo. Ambos tienen un interés común por el manejo de ecosistemas más allá de los límites de las reservas, lo que incentiva aún más esta colaboración, ya que, siendo los ecosistemas naturales una referencia obligada de sostenibilidad ecológica, el entendimiento de su dinámica funcional a largo plazo es clave para la gestión sustentable de los servicios y recursos que éstos nos brindan.

  7. Viabilidad de la ganadería familiar en áreas protegidas de humedales, en un contexto sinérgico de intensificación agraria e inundaciones: Parque Nacional Esteros de Farrapos-Uruguay

    OpenAIRE

    Gazzano Santos, María Inés

    2014-01-01

    El objetivo de la tesis es aportar elementos para la gestión agraria dentro y fuera del área protegida Esteros de Farrapos, desde una perspectiva agroecológica que resignifique la actividad de los productores ganaderos familiares del estero. Reconociendo su contribución en la articulación producción- conservación, tendiendo puentes a la transformación ambiental del territorio hacia la sustentabilidad. La ganadería en la zona de estudio requiere alternar los animales dentro y...

  8. Evaluacion ambiental de la produccion del cultivo de tomate (Lycopersicon esculentum Mill.), bajo condiciones protegidas en Las Palmas Gran Canaria, España, mediante la utilizacion de la metodologia del analisis del ciclo de vida (acv), 2007-2009

    OpenAIRE

    De León Cifuentes, Willian Erik

    2009-01-01

    El objetivo principal de esta tesis doctoral fue realizar una evaluación ambiental, efectuando una comparación de los invernaderos tipo parral y multitúnel y de tres tipos diferentes de sustratos utilizados en la producción de tomate bajo condiciones protegidas en las Palmas Gran Canaria. Para llevar a cabo esta cuantificación se utilizó la metodología del Análisis del Ciclo de Vida (ACV). Esta tesis esta estructurada en capítulos, en el primer capítulo, aparece la introducción, objetivos, el...

  9. Las áreas silvestres protegidas del estado como zonas de conservación de la naturaleza: El Parque Nacional Torres del Paine, Región de Magallanes y de la Antártica Chilena

    Directory of Open Access Journals (Sweden)

    M. González

    2013-12-01

    Full Text Available El presente trabajo es una breve descripción del Parque Nacional Torres del Paine, un área protegida localizada en el sur de Chile, que se caracteriza por la presencia de paisajes montañosos de origen glaciar, con una serie de lagos, lagunas, y ríos, los cuales albergan especies endémicas de flora y fauna. Estas características convierten a este parque en uno de los más visitados a nivel nacional. Se discuten aspectos sobre conservación y manejo del parque.

  10. Integración de diferentes modelos de protección para el diseño de un área natural protegida en Michoacán, México

    OpenAIRE

    Campos Sánchez, Minerva; Boada, Martí

    2008-01-01

    En algunos países de regiones tropicales en desarrollo, la eficiencia real de las áreas naturales protegidas (ANP) ha sido mínima y, en ocasiones, antagónica a los objetivos iniciales, lo cual ha provocado como consecuencia una pérdida de servicios ambientales, sociales y económicos. A nivel efectivo, uno de los elementos clave en la planificación de una ANP, es la delimitación del polígono a partir del cual deben integrarse las diferentes líneas de gestión ambiental. A su vez, la planificaci...

  11. Percepción de la población frente al cambio climático en áreas naturales protegidas de Baja California Sur, México

    OpenAIRE

    Olmos Martínez, Elizabeth; González Ávila, María Eugenia; Contreras Loera, Marcela Rebeca

    2014-01-01

    Este trabajo muestra la percepción de la población humana asentada en las siete áreas naturales protegidas federales de Baja California Sur, desde el punto de vista del conocimiento empírico sobre los cambios en el medio ambiente y recursos naturales ante efectos del Cambio Climático (CC). Se recolectaron datos a partir de la aplicación de 250 encuestas cualitativas en 2011. Los resultados muestran que la mayor parte de la población conoce el significado de CC y que los efectos que perciben s...

  12. Impacto ambiental del turismo en áreas naturales protegidas; procedimiento metodológico para el análisis en el Parque Estatal El Ocotal, México

    OpenAIRE

    Carlos Pérez Ramírez; Lilia Zizumbo; Miguel González Vera

    2009-01-01

    En la actualidad, la actividad turística es promovida ampliamente en las áreas naturales protegidas, como una importante estrategia para el aprovechamiento de los recursos naturales, sustentada en el argumento del limitado impacto ambiental generado en el entorno natural. No obstante, la excesiva acumulación del número de visitantes en determinadas temporadas al año, así como la realización de actividades recreativas sin control alguno en determinados espacios naturales, ha propiciado la gene...

  13. 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; Schlosser, Anders; Lund, Kit Peiter; Tornøe, Ida; Vitved, Lars; Hansen, Søren; Willis, Anthony; Kharazova, Alexandra D; Skjødt, Karsten; Sorensen, Grith Lykke; Holmskov, Uffe

    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...

  14. Principales características hidrogeoquímicas del acuífero de Balerma-Las Marinas (Almería

    Directory of Open Access Journals (Sweden)

    Martínez Vidal, J. L.

    1990-08-01

    Full Text Available The Balerma-Las Marinas aquifer, which features mainly Pliocene calcarenite rocks, is one of the three distinct hydrogeological units that have been identified in the Campo de Dalías area of Almería. Its hydrogeochemistry has been established by analyzing one hundred and eight samples from different points along the aquifer. The high sodium chloride content of the water is put down to fairly recent relative changes in the sea and continent levels, which have left saline water trapped by a series of blocks that divide the aquifer into various separate compartments. This relative lack of hydraulic continuity between the aquifer and the sea, together with fact that its resources are not subject to overuse, make it very unlikely that marine intrusion is the cause of the high saline content of the water. The conclusion to be drawn is that these waters are not very suitable either for human consumption or for irrigation.El acuífero de Balerma-Las Marinas, esencialmente integrado por calcarenitas pliocenas, constituye una unidad hidrogeológica de las tres diferenciadas en el Campo de Dalías. Sobre la base de ciento ocho análisis químicos de muestras de agua recogidas en otros tantos puntos acuíferos se llega a establecer la hidrogeoquímica del acuífero; el predominio de aguas de facies clorurada sódica es interpretado como relicto de movimientos relativos mar-continente, recientes, unido a la existencia de una serie de bloques que compartimentan el acuífero y que han hecho posible que permanezca entrampada el agua salobre. La escasa explotación a que está sometido el acuífero y la baja continuidad hidráulica existente entre el acuífero y el mar descartan los procesos de intrusión marina como responsables del alto contenido salino de las aguas. Consecuentemente con lo expuesto, las aguas tienen calidad mediocre a mala, tanto para consumo humano como para su uso agrícola.

  15. Nutrient and caloric dynamics in Avicennia marina leaves at different developmental and decay stages in Zhangjiang River Estuary, China

    Science.gov (United States)

    Zhou, Hai-Chao; Wei, Shu-Dong; Zeng, Qi; Zhang, Li-Hua; Tam, Nora Fung-yee; Lin, Yi-Ming

    2010-03-01

    Avicennia marina is a typical mangrove species in the subtropical coastlines of China. The main objective of this study was to assess nutrient and caloric dynamics in A. marina leaves at different developmental and decay stages. Decomposition studies using litter bags suggested that the time required for the loss of half of the initial dry weight ( t50) was 19 days. The extracts of A. marina leaves contained non-tannin phenolics and tannin phenolics (hydrolysable tannin), but no condensed tannin. Non-tannin phenolics and tannin phenolics contents did not differ significantly from each other at various developmental stages, but decreased rapidly during leaf decomposition. Avicennia marina leaves had high N levels, and both N and P concentrations decreased significantly during senescence. During decomposition, N concentration of the leaf litter increased gradually but the phosphorus concentration showed a decrease in the first week, and both N and P remained the same towards the end of the experiment. The gross caloric value (GCV) of mature leaves was significantly higher than those of young and senescent leaves, while ash-free caloric value (AFCV) did not change significantly during leaf development and senescence. During leaf decomposition, both GCV and AFCV increased gradually and remained the same at late stages. In subtropical Zhangjiang River Estuary, high N levels and lack of condensed tannins in A. marina leaves were responsible for the fast rate of decay. Non-tannin phenolics and tannin phenolics had no great effect on rate of decay. Nitrogen resorption during leaf senescence, and high litter decomposition followed by nitrogen immobilization are the important nutrient conservation strategy for A. marina.

  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. Actividades desarrolladas en la colección de bacterias marinas

    OpenAIRE

    Morales, M; Ortiz, E.; Villaverde, M.; V Caballero; Fonseca, E. L.; Núñez, R.

    2006-01-01

    En la Colección de Bacterias Marinas se conservan aislamientos procedentes de diferentes regiones del archipiélago cubano. Aquí se desarrollan actividades de investigación y servicios, entre las primeras se encuentran los estudios para la conservación de las cepas a mediano y largo plazo, la determinación taxonómica de sus componentes, la evaluación de bioactividades con aplicación en la industria médico-farmacéutica y en el saneamiento ambiental y la actualización de la base de datos asociad...

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

    OpenAIRE

    Mónica Murillo Muñoz; Enrique Javier Peña Salamanca

    2014-01-01

    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...

  19. Deposition, Decomposition. Losing the Body Sublime: Marina Abramović between Performance and Performativity

    OpenAIRE

    Capasso, Angelo

    2015-01-01

    Marina Abramović is the artist par excellence whose work can be identified with Performance Art. Abramović began performing in the heyday of Performance Art, the seventies. She continued performing during the crisis years of performance art in the eighties, then brought new ideas to it when it resurfaced internationally at the beginning of the nineties in different forms. Starting from her first Museum retrospective at MoMA The Artist is Present (2010), and the institution of the The Mari...

  20. Transformaciones demográficas y paisajísticas en la Marina Baixa

    OpenAIRE

    Quereda Sala, José

    1986-01-01

    En este trabajo se pone de manifiesto la espectacular transformación demográfica y paisajística operada en la Marina Baixa a partir de 1960. El factor decisivo ha sido un colosal desarrollo turístico que ha duplicado la población (120.000 hbts.) en las últimas décadas y determinado una zonificación del espacio comarcal a partir de la conurbación surgida a lo largo de los 66 Km. de costa.

  1. Viabilitat d'una plataforma de generació marina amb aerogeneradors i boies

    OpenAIRE

    Vives Uyà, Francesc

    2013-01-01

    El present Treball Fi de Grau pretén avaluar la viabilitat d’implementar una plataforma de generació marina formada per turbines eòliques i boies marines amb l’objectiu de captar l’energia de les onades situada a la costa basca, ja que és un dels indrets on hi ha un major recurs eòlic i undimotriu. El Treball Fi de Grau inclou una primera secció de teoria que proporciona els coneixements suficients per implementar una plataforma d’aquestes característiques. A la segona part ...

  2. El diario Convicción: entre Massera y la Marina

    OpenAIRE

    Borrelli, Marcelo Hernán

    2008-01-01

    El diario Convicción (1978-1983) nació vinculado a la Marina argentina y al proyecto político del almirante Emilio Eduardo Massera, jefe máximo del arma durante los dos primeros años del autodenominado Proceso de Reorganización Nacional. Esta situación dio lugar a un emprendimiento periodístico original, que formaba parte de lo que podría denominarse “la prensa del Proceso”, a diferencia de los medios tradicionales, que deben ser abordados desde su propia historia, dando cuenta de su comporta...

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

    OpenAIRE

    Nurby Ríos; Gerardo Medina; José Jiménez; Carlos Yánez; Maria Y. García; Maria L. Di Bernardo; Maria Gualtieri

    2011-01-01

    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, Klebsiell...

  4. Composición Esterólica de la Esponja Marina Xestospongia Muta

    OpenAIRE

    Carmenza Duque; Alejandro Martínez; Gustavo Peñuela

    2009-01-01

    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 Cr...

  5. Utjecaj propil galata i ekstrakta ružmarina na oksidacijsku stabilnost smjese biljnih ulja

    OpenAIRE

    Moslavac, T.; Pozderović, A.; Pichler, Anita; Volmut, Katica

    2010-01-01

    U ovom radu istraživan je utjecaj sintetskog antioksidansa propil galata (0,01 %) i prirodnog ekstrakta ružmarina Oxy´Less®CS (0,1 %) i StabilEnhance®OSR (0,1 %) na oksidacijsku stabilnost smjese suncokretovog ulja i ostalih vrsta biljnih ulja (50:50). Istraživana je smjesa suncokretovog ulja (50 %) i ostalih vrsta biljnih ulja (50 %): sojino ulje, ulje kukuruzne klice, repičino ulje i ulje koštica grožđa. Oksidacijska stabilnost različitih smjesa biljnih ulja, sa i bez dodanog sintetskog i p...

  6. Posibilidades de cultivo de nuevas especies marinas en el área mediterránea

    OpenAIRE

    Fernández Aldana, Juan Manuel

    2015-01-01

    La acuicultura, el cultivo y cría de animales y plantas acuáticas, representa en la actualidad una fuente esencial de proteína animal y vegetal altamente saludable y nutritiva, proporcionando un sistema de vida y de ingresos en todo el mundo. La acuicultura además de ser un motor para el desarrollo social y económico de las áreas costeras marinas y fluviales mundiales, supone en muchas regiones subdesarrolladas una garantía de alimento de alta calidad y es clave en la seguridad alimentaria de...

  7. Inhibitory Activity of Avicennia marina, a Medicinal Plant in Persian Folk Medicine, against HIV and HSV

    OpenAIRE

    Namazi, Rahele; Zabihollahi, Rezvan; Behbahani, Mandana; Rezaei, Abbas

    2013-01-01

    Avicennia marina (Avicenniaceae) is a species of mangrove tree used for treatment of small pox lesions in Persian folk medicine. The antiviral activity of methanol, ethanol, water, chloroform and n-hexane extracts was evaluated against HIV-1 and HSV. Methanol extract had the highest antiviral activity and the most polar fraction of this extract (fraction D) inhibited HSV with TI and SI values of 57.1 and 133; however, it showed mild activity against HIV with SI value of 6.25 (fraction 3). The...

  8. New Antioxidative Secondary Metabolites from the Fruits of a Beibu Gulf Mangrove, Avicennia marina

    Directory of Open Access Journals (Sweden)

    Cheng-Hai Gao

    2014-07-01

    Full Text Available Further chemical investigation of the fruits of the mangrove, Avicennia marina, afforded three new phenylethyl glycosides, marinoids J–L (1–3, and a new cinnamoyl glycoside, marinoid M (4. The structures of isolates were elucidated on the basis of extensive spectroscopic analysis and by comparison of the data with those of related secondary metabolites. The antioxidant activity of the isolates was evaluated using the cellular antioxidant assay (CAA, and compounds 1–4 showed antioxidant activities, with EC50 values ranging from 23.0 ± 0.71 μM to 247.8 ± 2.47 μM.

  9. Genetic diversity in three populations of Avicennia marina along the eastcoast of India by RAPD markers.

    Science.gov (United States)

    Hazarika, Dimendra; Thangaraj, M; Sahu, Sunil Kumar; Kathiresan, K

    2013-05-01

    Genetic diversity was analysed in three populations of the mangrove species, Avicennia marina by using random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). Ten random decamer primers were used to score the diversity from three locations of eastcoast of India: Parangipettai (Tamil Nadu), Kakkinada (Andhra Pradesh) and Sundarbans (West Bengal). These primers produced 388 scorable DNA fragments, of which 252 (64.98%) were polymorphic, 182 (46.90%) were monomorphic, and 14 (3.61%) were unique. RAPD banding patterns displayed variations between and within the populations, while, there was no morphological variation. PMID:24617156

  10. 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...

  11. Sulfide Intrusion and Detoxification in the Seagrass Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Holmer, Marianne

    2015-01-01

    Gaseous sulfide intrusion into seagrasses growing in sulfidic sediments causes little or no harm to the plant, indicating the presence of an unknown sulfide tolerance or detoxification mechanism. We assessed such mechanism in the seagrass Zostera marina in the laboratory and in the field with...... well as being stored as sulfate throughout the plant. We conclude that avoidance of sulfide exposure by reoxidation of sulfide in the rhizosphere or aerenchyma and tolerance of sulfide intrusion by incorporation of sulfur in the plant are likely major survival strategies of seagrasses in sulfidic...

  12. Mentoring Away the Glass Ceiling in Academia: A Cultured Critique edited by Brenda L. H. Marina

    OpenAIRE

    Campos, Magali

    2016-01-01

    Mentoring Away the Glass Ceiling in Academia: A Cultured Critiqued (2015) edited by Brenda L. H. Marina, is a comprehensive examination of women’s experiences in various stages in academia and the way in which mentoring can serve as a tool to break the glass ceiling that keep many women from reaching high positions in academia.Over a qualitative approach this book brings together narratives and counternarratives of women in academia to explore the ways mentorship can help the diversity gap fo...

  13. Superóxido dismutasa y catalasa en bacterias bioluminiscentes marinas

    OpenAIRE

    González-Lama, Z.; Díez-del-Pino, A.

    2001-01-01

    Han sido estudiadas la catalasa y la superóxido dismutasa (SOD) de bacterias bioluminiscentes marinas. Hemos encontrado varios isoenzimas de catalasa y un isoenzima de superóxido dismutasa y se ha observado que a menor luminiscencia los niveles de catalasa son mayores. Una variante de Photobacterium phosphoreum var. K (cepa mutante que carece de bioluminiscencia) mostró los máximos niveles de catalasa. Hay dos tipos de catalasas en esta estirpe, una de pI 7,2 que es inhibida por el 3-amino, 1...

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

    OpenAIRE

    Tito Sánchez; Jorge León; Juan Woolcott; Katherine Arauco

    2013-01-01

    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 d...

  15. Auditoría y evaluación energética de Marina Port Vell

    OpenAIRE

    Díaz Llobet, Mari Carmen; Suárez Gallegos, Dennys

    2014-01-01

    [CASTELLÀ] Marina Port Vell quiere ser una organización activa en la protección climática y reducción de emisiones de efecto invernadero. Por éste motivo, uno de sus objetivos el presente año es establecer la norma ISO: 50001 de gestión de energía. Para conseguirlo, la empresa Equipo de Ingenieros de Edificación SCP, desde marzo del presente año, ha procedido a realizar parte imprescindible de ese objetivo, que es la evaluación energética de los edificios de la marina, colabora...

  16. ENTRE EL PROGRESO Y EL ABUSO: PROBLEMÁTICA SOCIAL EN TORNO A LAS TIERRAS PROTEGIDAS DE LAS COMUNIDADES NATIVAS EN EL PERÚ

    Directory of Open Access Journals (Sweden)

    Jerjes Loayza Javier

    2011-12-01

    Full Text Available Normal 0 21 false false false ES-AR X-NONE X-NONE MicrosoftInternetExplorer4 /* 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-priority:99; mso-style-qformat: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:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Se busca comprender el fenómeno de los conflictos sociales en torno a la irrupción del Estado peruano en tierras legalmente protegidas, provocando malestar y profunda deslegitimación política de la representatividad democrática. Para ello se  analizan críticamente las contradicciones existentes entre el marco legal peruano e internacional más importante dirigido a proteger a las comunidades indígenas, el discurso del Estado amparado en la dicotomía “progreso-atraso” sustentadas por el Presidente de la República y las consecuencias de las prácticas políticas estatales desvinculadas del diálogo y el respeto hacia los pueblos originarios. Se hará especial énfasis en el conflicto social suscitado en las provincias de Bagua y Uctubamba ubicadas en la selva peruana en el año 2009, ya que éste trajo a colación un intenso debate en torno a un escenario no resuelto en nuestro país: la situación de los pueblos indígenas y sus derechos, aunque estipulados en la carta magna peruana, minimizados en la práctica, reforzando, así, el debate relacionado a la necesidad de una triple categoría Medio ambiente-población-sistema social. En adelante será necesario aunar tanto libertad econ

  17. Contraste empírico de la transferencia de tecnología en tres empresas de agricultura protegida en México

    Directory of Open Access Journals (Sweden)

    Carlos Gabriel Borbón Morales

    2015-01-01

    Full Text Available De acuerdo a algunos modelos teóricos de la transferencia de tecnología las empresas aprenden de otras empresas; en otras ocasiones las tecnologías se transfieren a partir de una política dirigida por el Gobierno donde las firmas, los centros de investigación y las instituciones de educación superior confluyen trasladando el conocimiento de un actor a otro; otro más, advierte la participación activa de la sociedad civil, que derivado de sus necesidades se transforma en el eje que articula el tránsito del conocimiento hacia su aplicación. En este trabajo se realiza un análisis de dichos modelos, con el fin de contrastarlos empíricamente utilizando casos de empresas que incorporan tecnología para la producción de hortalizas en invernaderos, caracterizando a sus actores, relacionando estas características y evaluando y las formas en las cuales estas empresas han vivido sus procesos de contacto, adaptación y modificación de la tecnología. Palabras clave: transferencia de tecnología, agricultura protegidaDe acuerdo a algunos modelos teóricos de la transferencia de tecnología las empresas aprenden de otras empresas; en otras ocasiones las tecnologías se transfieren a partir de una política dirigida por el Gobierno donde las firmas, los centros de investigación y las instituciones de educación superior confluyen trasladando el conocimiento de un actor a otro; otro más, advierte la participación activa de la sociedad civil, que derivado de sus necesidades se transforma en el eje que articula el tránsito del conocimiento hacia su aplicación. En este trabajo se realiza un análisis de dichos modelos, con el fin de contrastarlos empíricamente utilizando casos de empresas que incorporan tecnología para la producción de hortalizas en invernaderos, caracterizando a sus actores, relacionando estas características y evaluando y las formas en las cuales estas empresas han vivido sus procesos de contacto, adaptación y modificaci

  18. 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.

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

    International Nuclear Information System (INIS)

    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. - Highlights: • Microplastics were detected in mussels and lugworms living in natural conditions. • Effects on energy metabolism were assessed in a proof of principle experiment. • Exposure to high concentrations did not result in significant effects

  20. 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. PMID:25617854

  1. 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.

  2. 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).

  3. Radiocarbon isotopic evidence for assimilation of atmospheric CO2 by the seagrass Zostera marina

    Directory of Open Access Journals (Sweden)

    K. Watanabe

    2015-05-01

    Full Text Available Submerged aquatic vegetation assimilates dissolved inorganic carbon (DIC in the water column as a carbon source across its thin cuticle layer. However, it is expected that marine macrophytes also use atmospheric CO2 when exposed to the air during low tide, although assimilation of atmospheric CO2 has never been quantitatively evaluated. Using the radiocarbon isotopic signatures (Δ14C of the seagrass Zostera marina and DIC, we show quantitatively that Z. marina takes up and assimilates atmospheric modern CO2 in a shallow coastal ecosystem. The Δ14C values of the seagrass (−36 to −8‰ were significantly higher than those of aquatic DIC (−45 to −18‰, indicating that the seagrass uses a 14C-rich carbon source (atmospheric CO2, +17‰. A carbon-source mixing model indicated that the seagrass assimilated ~ 46% (mean: 22% of its inorganic carbon as atmospheric CO2. CO2 exchange between the air and the seagrass may be enhanced by the presence of a very thin water film over the air-exposed leaves during low tide. Our radiocarbon isotope analysis, showing assimilation of atmospheric modern CO2 as an inorganic carbon source, offers better understanding of the role of seagrass meadows in coastal carbon dynamics.

  4. 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.

  5. 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 ...... for eelgrass appeared to lie between 10 and 20 8C. These results show that extreme conditions may affect the fitness of eelgrass and, thus, may potentially limit its distribution in coastal and estuarine waters.......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...... included eight levels of salinity (2.5, 5, 10, 15, 20, 25, 30 and 35%) and seven water temperatures (5, 10, 15, 20, 25, 27.5 and 30 8C). Low salinity (i.e. 5 and 2.5%) increased mortality (3-6-fold) and had a strong negative effect on shoot morphology (number of leaves per shoot reduced by 40% and shoot...

  6. Rhizodegradation potential and tolerance of Avicennia marina (Forsk.) Vierh in phenanthrene and pyrene contaminated sediments.

    Science.gov (United States)

    Jia, Hui; Wang, He; Lu, Haoliang; Jiang, Shan; Dai, Minyue; Liu, Jingchun; Yan, Chongling

    2016-09-15

    A pot experiment was conducted to investigate the dissipation of phenanthrene and pyrene in spiked sediments with presence of Avicennia marina (Forsk.) Vierh. The rhizosphere environment was set up using a self-design nylon rhizo-bag which divided the sediment into the rhizosphere and non-rhizosphere. Results showed that the dissipation of phenanthrene and pyrene were significantly enhanced in the rhizosphere compared with non-rhizosphere sediments. Plant roots promoted dissipation significantly greater than the contribution of direct plant uptake and accumulation of phenanthrene and pyrene. The activities of antioxidant and detoxification enzymes in roots and leaves significantly increased against oxidative stress with increasing PAH concentrations. Furthermore, a significant relationship (R(2)>0.91) between dissolved organic carbon (DOC) concentrations and the residual of PAHs in rhizosphere and non-rhizosphere sediments was observed after 120days planting. Results indicated that rhizome mediation with A. marina is a useful approach to promote the depletion of PAHs in contaminated mangrove sediments. PMID:27373941

  7. 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. PMID:26814964

  8. Radiocarbon isotopic evidence for assimilation of atmospheric CO2 by the seagrass Zostera marina

    Science.gov (United States)

    Watanabe, K.; Kuwae, T.

    2015-10-01

    Submerged aquatic vegetation takes up water-column dissolved inorganic carbon (DIC) as a carbon source across its thin cuticle layer. It is expected that marine macrophytes also use atmospheric CO2 when exposed to air during low tide, although assimilation of atmospheric CO2 has never been quantitatively evaluated. Using the radiocarbon isotopic signatures (Δ14C) of the seagrass Zostera marina, DIC and particulate organic carbon (POC), we show quantitatively that Z. marina takes up and assimilates atmospheric modern CO2 in a shallow coastal ecosystem. The Δ14C values of the seagrass (-40 to -10 ‰) were significantly higher than those of aquatic DIC (-46 to -18 ‰), indicating that the seagrass uses a 14C-rich carbon source (atmospheric CO2, +17 ‰). A carbon-source mixing model indicated that the seagrass assimilated 0-40 % (mean, 17 %) of its inorganic carbon as atmospheric CO2. CO2 exchange between the air and the seagrass might be enhanced by the presence of a very thin film of water over the air-exposed leaves during low tide. Our radiocarbon isotope analysis, showing assimilation of atmospheric modern CO2 as an inorganic carbon source, improves our understanding of the role of seagrass meadows in coastal carbon dynamics.

  9. Identification and subcellular localization of starch-metabolizing enzymes in the green alga Dunaliella marina.

    Science.gov (United States)

    Kombrink, E; Wöber, G

    1980-07-01

    Enzymes of starch synthesis and degradation were identified in crude extracts of the unicellular green alga Dunaliella marina (Volvocales). By polyacrylamide gel electrophoresis and specific staining for enzyme activities, 4 multiple forms of starch synthase, 2 amylases, and at least 2 forms of α-glucan phosphorylase were visible. Using specific α-glucans incorporated into the gel before electrophoresis we have tentatively correlated α-amylase and β-amylase with both hydrolytic activities. The activities of α-glucan phosphorylase and amylase(s) were measured quantitatively in crude extracts, and the concomitant action of α-glucan phosphorylase and amylase(s) was found to account for the fastest rate of starch mobilization observed in vivo. Isolated chloroplasts retained both typical plastid marker enzymes and ADPglucose pyrophosphorylase, starch synthase, amylase(s), and α-glucan phosphorylase to a similar percentage. Gel electrophoretic analysis followed by staining for enzyme activity of a stromal fraction resulted in a pattern of multiple forms of starch-metabolizing enzymes analogous to that found in a crude extract. We interpret the combined data as indicating the exclusive location in vivo of starch-metabolizing enzymes in chloroplasts of D. marina. PMID:24306243

  10. 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.

  11. The effects of coal dust on photosynthetic performance of the mangrove, Avicennia marina in Richards Bay, South Africa

    Energy Technology Data Exchange (ETDEWEB)

    Naidoo, G.; Chirkoot, D. [University of Durban Westville, Durban (South Africa). Dept. of Botany

    2004-07-01

    Richards Bay, on the northern KwaZulu-Natal coast, is the largest coal exporting port in South Africa. The coal is stored at the Richards Bay Coal Terminal (RBCT) prior to export. Dust from coal operations is a major problem in the Richards Bay area. In this study, we tested the hypothesis that coal dust adversely affects photosynthetic performance of Avicennia marina (Forssk.) Vierh., the dominant mangrove species in the harbour. Photosynthetic performance was determined on 10 trees by measuring carbon dioxide uptake and chlorophyll fluorescence parameters at two elevation sites and on upper and lower leaf surfaces that were covered or uncovered with coal dust. Measurements were made on five clear, sunny days at saturating light (> 1000 {mu}mol m{sup -2} s{sup -1}) and high temperature (28-30{sup o}C). Coal dust significantly reduced carbon dioxide exchange of upper and lower leaf surfaces by 17-39%, the reduction being generally greater on the lower leaf surface that is covered by a dense mat of trichomes and salt glands. The reduction in carbon dioxide exchange by coal dust was higher at the high elevation site that supported isolated dwarfed trees. The chlorophyll fluorescence data indicated that leaves coated with dust exhibited significantly lower photosystem II (PS II) quantum yield, lower electron transport rate (ETR) through PSII and reduced quantum efficiency of PSII (F{sub v}/F{sub m}). The chlorophyll fluorescence data supported the gas exchange measurements and are consistent with reduced photosynthetic performance of leaves coated with coal dust.

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

    DEFF Research Database (Denmark)

    Stæhr, Peter A.; Borum, Jens

    Sæsontilpasning i stofskiftet reducerer lyskravet hos Ålegræs (Zostera marina) Peter A. Stæhr1 og Jens Borum2 1 Danmarks Miljøundersøgelser, Afdeling for Marin Økologi, Aarhus Universit, Frederiksborgvej 399, PO Box 358, 4000 Roskilde, Email: pst@dmu.dk 2 Ferskvandsbiologisk Laboratorium, biologisk...

  13. 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

    The habitat-modifying suspension-feeding mussel, Mytilus edulis, may have facilitating or inhibiting effects on seagrass meadows depending on the environmental conditions. We investigated the effects of M. edulis on sediment biogeochemistry in Zostera marina meadows under eutrophic conditions in...

  14. 75 FR 5115 - Temporary Concession Contract for Lake Mead National Recreation Area, AZ/NV

    Science.gov (United States)

    2010-02-01

    ...Pursuant to 36 CFR 51.24, public notice is hereby given that the National Park Service intends to award a temporary concession contract for the conduct of certain visitor services within Lake Mead National Recreation Area, Arizona and Nevada for a term not to exceed 3 years. The visitor services include marina and boat rentals, overnight accommodations, food and beverage, retail, fuel, and......

  15. Marina buildings

    OpenAIRE

    Addison, Mike

    2009-01-01

    The print is in response to an ongoing thematic enquiry into structures and facades including of industrial , rail and maritime heritage etc., with reference to associated surface and graphic qualities. It is an example of an ongoing exploration of colour, light, surface and motif within selected aspects of architecture, structure and facade. Constructed using vector software, it combines printmaking techniques and the technology of inkjet printing using pigment inks and archival substrates. ...

  16. An introduced pentastomid parasite (Raillietiella frenata) infects native cane toads (Rhinella marina) in Panama.

    Science.gov (United States)

    Kelehear, Crystal; Saltonstall, Kristin; Torchin, Mark E

    2015-04-01

    The pentastomid parasite, Raillietiella frenata, is native to Asia where it infects the Asian House gecko, Hemidactylus frenatus. This gecko has been widely introduced and recently R. frenata was found in introduced populations of cane toads (Rhinella marina) in Australia, indicating a host-switch from introduced geckos to toads. Here we report non-native adult R. frenata infecting the lungs of native cane toads in Panama. Eight of 64 toads were infected (median = 2.5, range = 1-80 pentastomids/toad) and pentastomid prevalence was positively associated with the number of buildings at a site, though further sampling is needed to confirm this pattern. We postulate that this pattern is likely due to a host shift of this parasite from an urban-associated introduced gecko. This is the first record of this parasite infecting cane toads in their native range, and the first instance of this parasite occurring in Central America. PMID:25394910

  17. Radioactivity in north European waters: report of Working Group 2 of CEC project MARINA

    International Nuclear Information System (INIS)

    The primary objective of Working Group 2 of Project MARINA was to consider recent measurements of environmental radioactivity in north European waters and to use this, and other information, to report likely magnitude of doses to the critical group from marine pathways. The monitoring data were supplemented, where appropriate, with predictions from simple models. The major sources of radioactivity studied were as follows: (i) liquid wastes from nuclear fuel reprocessing plants, (Sellafield, Dounreay, Cap de la Hague); (ii) liquid wastes from nuclear power plants and other major nuclear industry sites, (including Belgium, Denmark, France, Finland, GDR, FDR, Netherlands, Sweden, UK, USSR); (iii) solid waste disposal in the deep north-east Atlantic; (iv) fallout from Chernobyl; and (v) naturally-occurring radionuclides. (author)

  18. 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.

  19. Distribution and characteristics of marine litter on the Marina beach, Chennai, India

    Science.gov (United States)

    Dhanapal, R.

    2013-05-01

    The types, quantities, and distribution of marine litter found on the beach of the Marina, Chennai, India were surveyed during 2010-2011 season wise. Litter items were sorted into material and usage categories. The counts and weights of the litter were counted and measured. The plastic-type litter (63.4 kg) is the most dominant material category followed by polythene (10.6 kg), metal (5.3 kg) and glass (15.2 kg). Cloth (66.0 kg) is the dominant usage category followed by rubber (45.7 kg) and wood (70.0 kg). Based on the typological results three dominant litter sources were identified viz., land-based, vessel-based and fishery-based sources. t test help recognize dominant litter sources.t; t;

  20. La arquitectura de los despoblados moriscos en los valles de la Marina Alta.

    OpenAIRE

    SOLER ESTRELA, ALBA

    2009-01-01

    La tesis realiza el estudio arquitectónico de los núcleos de población de origen islámico y mudéjar, que quedaron abandonados tras la expulsión de los moriscos, en el ámbito geográfico de los Valles de la Marina Alta (Alicante). El método desarrollado se inscribe en la línea de los estudios e investigaciones relacionadas con el conocimiento para la conservación del patrimonio arquitectónico. A partir de una lectura arquitectónica basada en la observación directa de las edificaciones se realiz...

  1. Esteróles libres monohidroxilados de la esponja marina agelas schmidti (wilson, 1902)

    OpenAIRE

    Carmenza Duque; Germán Castillo; Sandra Buitrago; Oscar Osorno; Sven Zea

    2010-01-01

    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 fu...

  2. 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

    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...... and temperature. Seedlings had higher absolute mortality, while adult shoots were relatively more sensitive to unfavorable levels of salinity. Leaf tissue sucrose concentrations in both life stages decreased at low salinity, whereas salinity and temperature resulted in contrasting starch...... concentrations between seedlings and adult shoots. Our results show that altered salinity and temperature may have negative synergistic effects on eelgrass performance. Future climate changes may thus have serious impacts on eelgrass survival and performance....

  3. 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...... recovered, suggesting that physical dispersion by waves and currents was considerably important for horizontal distribution. However, polychaete affected significantly the vertical distribution of seeds.Overall the effects of these three polychaetes indicate that benthicmacroinvertebratesmay significantly...... impact eelgrass seed bank at the ecosystemscale. Some species have a positive effect by burying seeds to shallow depths and thereby reducing seed predation and facilitating seed germination, while other species bury seeds too deep for successful seed germination and seedling development....

  4. 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 in...... 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...

  5. Supramolecular organization of phycobiliproteins in the chlorophyll d-containing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Chen, Min; Floetenmeyer, Matthias; Bibby, Thomas S

    2009-08-01

    Here we report the high-resolution detail of the organization of phycobiliprotein structures associated with photosynthetic membranes of the chlorophyll d-containing cyanobacterium Acaryochloris marina. Cryo-electron transmission-microscopy on native cell sections show extensive patches of near-crystalline phycobiliprotein rods that are associated with the stromal side of photosynthetic membranes. This supramolecular photosynthetic structure represents a novel mechanism of organizing the photosynthetic light-harvesting machinery. In addition, the specific location of phycobiliprotein patches suggests a physical separation of photosystem I and photosystem II reaction centres. Based on this finding and the known photosystem's structure in Acaryochloris, we discuss possible membrane arrangements of photosynthetic membrane complexes in this species. PMID:19596002

  6. Kinetics of phyllosemiquinone oxidation in the Photosystem I reaction centre of Acaryochloris marina.

    Science.gov (United States)

    Santabarbara, Stefano; Bailleul, Benjamin; Redding, Kevin; Barber, James; Rappaport, Fabrice; Telfer, Alison

    2012-02-01

    Light-induced electron transfer reactions in the chlorophyll a/d-binding Photosystem I reaction centre of Acaryochloris marina were investigated in whole cells by pump-probe optical spectroscopy with a temporal resolution of ~5ns at room temperature. It is shown that phyllosemiquinone, the secondary electron transfer acceptor anion, is oxidised with bi-phasic kinetics characterised by lifetimes of 88±6ns and 345±10ns. These lifetimes, particularly the former, are significantly slower than those reported for chlorophyll a-binding Photosystem I, which typically range in the 5-30ns and 200-300ns intervals. The possible mechanism of electron transfer reactions in the chlorophyll a/d-binding Photosystem I and the slower oxidation kinetics of the secondary acceptors are discussed. PMID:22037394

  7. 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.

  8. 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

  9. 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.

  10. 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

  11. 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.

  12. 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.

  13. Disturbance of eelgrass Zostera marina by commercial mussel Mytilus edulis harvesting in Maine: Dragging impacts and habitat recovery

    Science.gov (United States)

    Neckles, H.A.; Short, F.T.; Barker, S.; Kopp, B.S.

    2005-01-01

    We studied the effects of commercial harvest of blue mussels Mytilus edulis on eelgrass Zostera marina L. in Maquoit Bay, Maine, USA, at a hierarchy of scales. We used aerial photography, underwater video, and eelgrass population- and shoot-based measurements to quantify dragging impacts within 4 sites that had been disturbed at different times over an approximate 7 yr interval, and to project eelgrass meadow recovery rates. Dragging had disturbed 10% of the eelgrass cover in Maquoit Bay, with dragged sites ranging from 3.4 to 31.8 ha in size. Dragging removed above- and belowground plant material from the majority of the bottom in the disturbed sites. One year following dragging, eelgrass shoot density, shoot height and total biomass of disturbed sites averaged respectively 2 to 3 %, 46 to 61 % and <1 % that of the reference sites. Substantial differences in eelgrass biomass persisted between disturbed and reference sites up to 7 yr after dragging. Dragging did not affect physical characteristics of the sediment. The pattern and rate of eelgrass bed recovery depended strongly on initial dragging intensity; areas of relatively light dragging with many remnant eelgrass patches (i.e. patches that were missed by the mussel dredge) showed considerable revegetation in 1 yr. However, by developing recovery trajectories from measurements at sites disturbed in different years, we projected that it would require a mean of 10.6 yr for recovery of eelgrass shoot density within the areas of intense dragging characterizing most of the disturbed sites. A spatial simulation model based on measured rates of lateral patch-expansion (mean 12.5 cm yr-1) and new-patch recruitment (mean 0.19 patches m-2 yr-1) yielded a mean bed recovery time of 9 to 11 yr following dragging, depending on initial degree of plant removal. Model simulations suggested that with favorable environmental conditions, eelgrass beds might recover from dragging disturbance in 6 yr; conversely, recovery under

  14. Exposure of the population of countries within the European Union to radioactivity in the mediterranean sea: Project MARINA-MED

    International Nuclear Information System (INIS)

    The discharges examined in the Project MARINA-MED were from nuclear installations in France, Italy and Spain, over the period 1980-1991; those from the Marcoule fuel reprocessing plant were found to contribute most of the collective dose arising from radioactivity in the Mediterranean Sea. Over 90% of beta-gamma discharges were of tritium and the remainder comprised some 80% 106Ru + 106Rh, 7% 90Sr + 90Y, 6% 137Cs, and 1% each of 134Cs, 58Co and 54Mn. The alpha emitters were dominated by 241Am, 239+240Pu and natural uranium, each representing 30% of the total. The contribution from Chernobyl had largely disappeared by 1990, except in the northern Aegean Sea, where continuing input came from the Black Sea. The corresponding exposure of the critical group in the Mediterranean Sea area from 137Cs (for an annual consumption of 73 kg fish and 35 kg shellfish) was estimated to be 7.5 μSv in 1990; the exposure of the critical group in the Black Sea area would have been about 40 μSv. These values are much lower than that estimated for 210Po, which corresponds to about 0.5 mSv. Data were obtained on catches and consumption rates of fish, crustaceans and molluscs for the relevant countries within the European Union, including import and export. Using data from the Food and Agriculture Organization of the United Nations, it was possible to extend the data to other countries bordering the Mediterranean Sea. Peak annual collective doses were estimated at less than 0.2 man·Sv for the period considered. For discharges over the entire period (1980-1991) the total collective dose commitment, truncated at 500 years, was estimated to be about 2 man·Sv. The most significant radionuclides, especially in the first few years, were found to be 106Ru (0.76 man·Sv) and 241Am (0.25 man·Sv). (author). 7 refs, 3 tabs

  15. 红树白骨壤幼苗对水中重金属的吸附性能研究%Removal of Heavy Metal Ions with Avicennia marina Seedling

    Institute of Scientific and Technical Information of China (English)

    王一兵; 柯珂; 陈奕君; 张荣灿; 雷富

    2015-01-01

    Objective]The absorption capabilities of Cu,Pb,Zn and Cd by Avicennia marina seedling were investigated to reduce the severe pollution in the offshore marine areas of Guangxi.[Methods]The Avicennia marina seedlings were obtained from the hypocotyls planted in sands with hoagland’s fluid,and then were cultured in hoagland’s fluid with dif-ferent concentrations of heavy metals.After 35 day’s cultivation,the contents of heavy met-als in Avicennia marina seedlings were determined by microwave digestion and atomic ab-sorption spectrometry.[Results]The increase of heavy metals concentration in the culture fluids led to the increase of heavy metals in the seedlings.The highest amount of heavy met-al is 980.78 μg/g of Cu,1623.03 μg/g of Pb,446.21 μg/g of Zn and 69.41 μg/g of Cd,re-spectively.The amounts of heavy metals in different part of seedlings is root > stem >leaf.This result meant that the heavy metal contents mainly were accumulated in root.The transport capability for different kind of heavy metals in the root and stem of seedlings were different.The transportation from easy to diffi-cult in seedling is Zn> Cu> Cd> Pb.[Conclu-sion]The Avicennia marina seedlings showed good absorption capabilities to 4 kinds of heavy metals in aqueous solution,especially to Pb and Cu.The Avicennia marina is a pro-spective plant for restoring the heavy metal pollution in estuary and offshore marine areas.%【目的】针对广西近岸海域重金属污染越来越严重的问题,研究红树白骨壤幼苗对水中重金属(Cu,Pb, Zn,Cd)的吸附去除性能。【方法】红树白骨壤幼苗采用砂培法由胚轴栽培而得,配制不同浓度混合重金属培养液对红树白骨壤幼苗胁迫培养35 d 后采用原子吸收光谱法测定其体内的重金属含量。【结果】随着培养液中重金属浓度的升高,红树白骨壤幼苗体内的重金属含量也逐渐增加,最高含量分别达到 Cu 980.78μg/g, Pb 1623.03

  16. 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.

  17. 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.

    OpenAIRE

    Heike Kahlert

    2012-01-01

    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 d...

  18. 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

    2016-06-01

    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. PMID:27334826

  19. Application of MALDI-MSI for detection of antimicrobial peptides in tissues of the marine invertebrate Arenicola marina

    Directory of Open Access Journals (Sweden)

    AL Maltseva

    2016-07-01

    Full Text Available Application of MALDI-MSI for detection of antimicrobial peptides in tissues of the marine invertebrate Arenicola marina AL Maltseva1 , VV Starunov1 , PA Zykin2 1 Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia 2 Department of Cytology and Histology, St Petersburg State University, St Petersburg, Russia Accepted June 13, 2016 Abstract MALDI imaging mass-spectrometry (MALDI-MSI is a highly informative approach combining morphology with molecular data. It is widely applied in neuroscience, plant science, cancer-biology, biomedicine, including clinical, and preclinical studies, but not for investigation of endogenous peptides/proteins or metabolites in marine invertebrates. We examined the informativeness of MALDIMSI for analysis of distribution of antimicrobial peptides (arenicins in the polychete Arenicola marina and concluded that it can be successfully used as a primary rough express screening method.

  20. 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.

  1. [Determination of apparent mean mass of proteins associated with heme in the hemoglobin molecule of Arenicola marina (L.), Annelida, Polychaeta].

    Science.gov (United States)

    Toulmond, A

    1979-02-12

    Protein and iron concentrations and maximum combined oxygen concentration were measured in the blood of the lugworm Arenicola marina. The calculated mean molecular mass of the heme-associated proteins was higher than that reported for known invertebrate and vertebrate intracellular hemoglobins. The difference is probably due to the presence of polypeptide chains not linked to heme groups in the extracellular annelid hemoglobins. PMID:111865

  2. 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.

  3. Pingelised päevad / Albina Heider, Kairi Kaldoja, Marina Talisainen ; vahendas Merike Määrits

    Index Scriptorium Estoniae

    Heider, Albina

    2001-01-01

    Albina Heider, Kairi Kaldoja ja Marina Talisainen on TPÜ filoloogiateaduskonna üliõpilastuutorid. Üliõpilastuutor pedagoogikaülikoolis on eriala vanema astme üliõpilane, kes peale vastava koolituse saamist omab õigust oma kompetentsi piires abistada uusi üliõpilasi info ja nõuannetega. Mida küsitakse esimestel ülikoolipäevadel üliõpilastuutorilt kõige enam

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

    OpenAIRE

    Francisco Tiago de Vasconcelos Melo; Elane Guerreiro Giese; Adriano Penha Furtado; Maurílio José Soares; Evonnildo Costa Gonçalves; Antonio Carlos Rosário Vallinoto; Jeannie Nascimento dos Santos

    2011-01-01

    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 ...

  5. Mitochondrial DNA variation and cryptic speciation within the free-living marine nematode Pellioditis marina

    OpenAIRE

    Derycke, S.; Remerie, T.; Vierstraete, A.; Backeljau, T.; Vanfleteren, J.; Vincx, M.; Moens, T.

    2005-01-01

    An inverse correlation between dispersal ability and genetic differentiation among populations of a species is frequently observed in the marine environment. We investigated the population genetic structure of the free-living marine nematode Pellioditis marina. A total of 426 bp of the mitochondrial cytochrome oxidase subunit 1 (COI) gene were surveyed on a geographical scale of approximately 100 km during spring 2003. Nematodes were collected from 2 coastal locations in Belgium, and from 2 e...

  6. 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. PMID:22829000

  7. 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. PMID:26552519

  8. Excitation energy transfer in intact cells and in the phycobiliprotein antennae of the chlorophyll d containing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Theiss, Christoph; Schmitt, Franz-Josef; Pieper, Jörg; Nganou, Collins; Grehn, Moritz; Vitali, Marco; Olliges, Rachel; Eichler, Hans Joachim; Eckert, Hann-Jörg

    2011-08-15

    The cyanobacterium Acaryochloris marina is unique because it mainly contains Chlorophyll d (Chl d) in the core complexes of PS I and PS II instead of the usually dominant Chl a. Furthermore, its light harvesting system has a structure also different from other cyanobacteria. It has both, a membrane-internal chlorophyll containing antenna and a membrane-external phycobiliprotein (PBP) complex. The first one binds Chl d and is structurally analogous to CP43. The latter one has a rod-like structure consisting of three phycocyanin (PC) homohexamers and one heterohexamer containing PC and allophycocyanin (APC). In this paper, we give an overview on the investigations of excitation energy transfer (EET) in this PBP-light-harvesting system and of charge separation in the photosystem II (PS II) reaction center of A. marina performed at the Technische Universität Berlin. Due to the unique structure of the PBP antenna in A. marina, this EET occurs on a much shorter overall time scale than in other cyanobacteria. We also briefly discuss the question of the pigment composition in the reaction center (RC) of PS II and the nature of the primary donor of the PS II RC. PMID:21396735

  9. 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 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.

  10. Efeito da gordura protegida sobre a produção e composição do leite em ovelhas da raça Bergamácia Effect of bypass fat on milk production and composition in Bergamasca ewes

    OpenAIRE

    Monalissa de Melo Stradiotto; Edson Ramos de Siqueira; Rodrigo Martins de Souza Emediato; Sirlei Aparecida Maestá; Marcela Buosi Martins

    2010-01-01

    Objetivou-se avaliar o efeito da gordura protegida sobre a produção e composição do leite em ovelhas da raça Bergamácia. Utilizaram-se 77 ovelhas distribuídas, por ordem de parição e idade, em duas dietas: uma composta de silagem de milho e concentrado; e outra com gordura protegida (35 g/ovelha/dia) no concentrado. As dietas foram isoenergéticas e isoproteicas e continham 70% NDT e 16% PB com base na matéria seca. Os cordeiros permaneceram com suas mães até os 45 dias de idade, quando foram ...

  11. 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

  12. 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.

  13. Simultaneous determination of antifouling herbicides in marina water samples by on-line solid-phase extraction followed by liquid chromatography-mass spectrometry.

    Science.gov (United States)

    Ferrer, I; Barceló, D

    1999-08-27

    Solid-phase extraction (SPE) coupled on-line with either liquid chromatography-diode array detection (LC-DAD) or liquid chromatography-atmospheric pressure chemical ionization mass spectrometry was applied to the simultaneous analysis of several antifouling herbicides such as diuron, TCMTB (2-thiocyanomethylthiobenzothiazole), Irgarol and chlorothalonil in seawater samples. SPE was carried out on polymeric cartridges (PLRP-s) after the percolation of 100 ml of seawater sample, with recoveries ranging from 96 to 111% for the antifouling compounds. LC-MS detection was used in negative and positive ion mode. In positive ion mode, additional structural information for diuron and Irgarol was obtained by increasing the fragmentor voltage, thus permitting the unequivocal identification of these compounds in environmental waters. Method detection limits were in the range of 0.005 microg/l. This methodology was also compared to LC-DAD in terms of selectivity and sensitivity. Finally, the method was evaluated for the analysis of environmental seawater samples, from the Ebre Delta area and Masnou marina, in Catalonia (Spain). PMID:10497940

  14. Mixed population genomics support for the central marginal hypothesis across the invasive range of the cane toad (Rhinella marina) in Australia.

    Science.gov (United States)

    Trumbo, Daryl R; Epstein, Brendan; Hohenlohe, Paul A; Alford, Ross A; Schwarzkopf, Lin; Storfer, Andrew

    2016-09-01

    Understanding factors that cause species' geographic range limits is a major focus in ecology and evolution. The central marginal hypothesis (CMH) predicts that species cannot adapt to conditions beyond current geographic range edges because genetic diversity decreases from core to edge due to smaller, more isolated edge populations. We employed a population genomics framework using 24 235-33 112 SNP loci to test major predictions of the CMH in the ongoing invasion of the cane toad (Rhinella marina) in Australia. Cane toad tissue samples were collected along broad-scale, core-to-edge transects across their invasive range. Geographic and ecological core areas were identified using GIS and habitat suitability indices from ecological niche modelling. Bayesian clustering analyses revealed three genetic clusters, in the northwest invasion-front region, northeast precipitation-limited region and southeast cold temperature-limited region. Core-to-edge patterns of genetic diversity and differentiation were consistent with the CMH in the southeast, but were not supported in the northeast and showed mixed support in the northwest. Results suggest cold temperatures are a likely contributor to southeastern range limits, consistent with CMH predictions. In the northeast and northwest, ecological processes consisting of a steep physiological barrier and ongoing invasion dynamics, respectively, are more likely explanations for population genomic patterns than the CMH. PMID:27393238

  15. Bioavailability and concentration of heavy metals in the sediments and leaves of grey mangrove, Avicennia marina (Forsk.) Vierh, in Sirik Azini Creek, Iran.

    Science.gov (United States)

    Parvaresh, Hossein; Abedi, Zahra; Farshchi, Parvin; Karami, Mahmood; Khorasani, Nematullah; Karbassi, Abdolreza

    2011-11-01

    The concentration and bioavailability of Ni, Cu, Cd, Zn, and Pb in the sediments and leaves of grey mangrove, Avicennia marina, were studied throughout Sirik Azini creek (Iran) with a view to determine heavy metals bioavailability, and two methods were used. Results show that Zn and Ni had the highest concentrations in the sediments, while Cd and Cu were found to have the lowest concentrations in the sediments. Compared to the mean concentrations of heavy metals in sedimentary rock (shales), Zn and Cu showed lower concentration, possibly indicating that the origin of these heavy metals is natural. A geo-accumulation index (Igeo) was used to determine the degree of contamination in the sediments. Igeo values for Zn, Cu, Pb, and Ni showed that there is no pollution from these metals in the study area. As heavy metal concentrations in leaves were higher than the bioavailable fraction of metals in sediments, it follows that bioconcentration factors (leaf/bioavailable sediment) for some metals were higher than 1. PMID:21053092

  16. Estudio para la integración del régimen de caudales ecológicos en la estimación del recurso disponible de los acuíferos. Caso 4: Sistemas Serpis-Marina Baja-Marina Alta-Vinalopó

    OpenAIRE

    GONZÁLEZ CANALES, JUAN LUIS

    2015-01-01

    [EN] This study intents to estimate the environmental restrictions of groundwater bodies considered by the considered by the Jucar Hydrographic Confederation that enable us to achieve the ecological flow at all points of the rivers components of the Júcar exploited systems as with Turia, Marina-Baja , Marina-Alta and Vinalopo-Alcanti systems. To this end, it has been carried out the process of adapting the flows provided to each river stretch in relation to three hypotheses. The first h...

  17. PRODUÇÃO E ASPECTOS QUALITATIVOS DO LEITE DE VACAS JERSEY DURANTE PERÍODO INICIAL DE SUPLEMENTAÇÃO DE GORDURA PROTEGIDA DE ÓLEO DE PALMA

    Directory of Open Access Journals (Sweden)

    Mikael Neumann

    2015-12-01

    Full Text Available The objective was to evaluate the effects of by pass fat supplementation of a palm oil source provided in the initial phase under the aspects of daily milk production, daily milk production corrected to 4% fat, fat, solid total, total protein and lactose in milk. The experiment was conducted on the premises of the Didactic Unit Dairy Cattle (DUDC in Midwest State University (UNICENTRO. Eight Jersey cows were used in the same stadium lactation, age and birth order. The cows were supplemented for five days at a dose of 400g cow day-1. The experimental design was a simple reversal with two periods of 5 days of data collection. The protected palm oil fat supplemented in a short period of 5 days at the dose of 400g animal day-1, were unable to change (P> 0.05 production and milk quality aspects. Although the cows had a great acceptability of by pass fat supplementation with palm oil in the proportion of 400 g cow day-1, however, did not generate quantitative and qualitative immediate benefits in milk production. O objetivo do trabalho foi avaliar os efeitos da suplementação de gordura protegida de óleo de palma proporcionados na fase inicial de seu fornecimento sob aspectos de produção diária de leite, produção diária de leite corrigida para 4% de gordura, teores de gordura, sólidos totais, proteína total e lactose do leite. O experimento foi conduzido nas instalações da Unidade Didática de Bovinocultura Leiteira (UDBL da Universidade Estadual do Centro-Oeste (UNICENTRO. Foram utilizadas oito vacas da raça Jersey em mesmo estádio lactacional, idade e ordem de parto. As vacas foram suplementadas por cinco dias em dose de 400 g vaca dia-1. O delineamento experimental foi o de simples reversão com dois períodos sucessivos de 5 dias de coleta de dados. A gordura protegida de óleo palma suplementada em curto período de 5 dias na dose de 400 g animal-1, não foi capaz de alterar (P>0,05 a produção e os aspectos qualitativos do leite

  18. 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.

  19. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

  2. Relaciones históricas entre las tortugas marinas y las sociedades del finis terra bajacaliforniano

    Directory of Open Access Journals (Sweden)

    Raquel Briseño Dueñas

    2013-09-01

    Full Text Available Este trabajo presenta la historia ambiental de las relaciones entre las tortugas marinas y las sociedades que han habitado la Región del Cabo que se encuentra en la punta sur de la Península de Baja California. En este finis terra, sumamente aislado, han abundado esos quelonios y han sido un importante recurso alimenticio para sus habitantes, desde la prehistoria a la fecha. Su pesca fue sustentable hasta mediados del siglo XX, cuando empezó a ser desmedida a causa de su uso industrial; lo que condujo a una veda total para evitar su extinción. Actualmente con la modernización de la región, convertida al turismo de masas, estos animales emblemáticos han tenido que enfrentar nuevas amenazas, pero también han sido incorporados en diversos esquemas de conservación que han tenido éxito, por lo que es factible prever su recuperación.

  3. Seawater salinity and blood acid-base balance in the lugworm, Arenicola marina (L.).

    Science.gov (United States)

    Toulmond, A; Jouin, C

    1992-03-01

    The kinetics of variations in the blood acid base balance (ABB) were investigated in a moderately euryhaline osmoconformer, the lugworm Arenicola marina (L.), exposed to natural and experimental hypo- or hyperosmotic shocks. In natural as well as in experimental conditions, a hyposmotic shock induced a transient and essentially metabolic acidosis, probably linked to the ionic readjustments following the shock, which was rapidly overridden by a metabolic alkalosis. In field conditions, a new ABB equilibrium was then attained, the metabolic alkalosis being neutralized by the respiratory and metabolic acidosis occurring normally in the lugworm during low tide. Conversely, in the normoxic conditions of our laboratory experiments, a new ABB equilibrium was never reached. Under experimental conditions, a hyperosmotic shock always induced a respiratory and metabolic acidosis. In the field, this phenomenon must occur at the beginning of high tide and must help to restore normal blood ABB in lugworms submitted to a moderate hyposmotic shock during low tide. All the observed blood ABB variations reveal the complex intracellular processes through which the lugworm submitted to moderate osmotic shocks tentatively regulates, sometimes without any real success, its osmoticity and volume. Obviously, complementary physical, physiological and behavioral mechanisms allow the lugworm to live in sediments washed by almost fresh water during a 7-8 h 'low tide'. PMID:1604064

  4. The impact of the herbicide atrazine on growth and photosynthesis of seagrass, Zostera marina (L.), seedlings

    International Nuclear Information System (INIS)

    Highlights: → Impact of the widely used herbicide atrazine on eelgrass seedlings was studied. → Atrazine presents a threat to eelgrass seedlings growth and photosynthesis. → The impact of atrazine on eelgrass seedlings is much higher than for adult plants. - Abstract: The impact of the widely used herbicide atrazine on seedling growth and photosynthesis of eelgrass was determined. The long-term impact of the herbicide atrazine (1, 10 and 100 μg/L) on growth of eelgrass Zostera marina (L.) seedlings, maintained in outdoor aquaria, was monitored over 4 weeks. Exposure to 10 μg/L atrazine resulted in significantly lower plant fresh weight and total chlorophyll concentration and up to 86.67% mortality at the 100 μg/L concentration. Short-term photosynthetic stress on eelgrass seedlings was determined and compared with adult eelgrass using chlorophyll fluorescence. The effective quantum yield in eelgrass seedlings was significantly depressed at all atrazine concentrations (2, 4, 8, 16, 32 and 64 μg/L) even within 2 h and remained at a lower level than for adult plants for each concentration. These results indicate that atrazine presents a potential threat to seagrass seedling functioning and that the impact is much higher than for adult plants.

  5. Composición Esterólica de la Esponja Marina Xestospongia Muta

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

  7. 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.

  8. Corticosterone-immune interactions during captive stress in invading Australian cane toads (Rhinella marina).

    Science.gov (United States)

    Graham, Sean P; Kelehear, Crystal; Brown, Gregory P; Shine, Richard

    2012-07-01

    Vertebrates cope with physiological challenges using two major mechanisms: the immune system and the hypothalamic pituitary-adrenal axis (e.g., the glucocorticoid stress response). Because the two systems are tightly integrated, we need simultaneous studies of both systems, in a range of species, to understand how vertebrates respond to novel challenges. To clarify how glucocorticoids modulate the amphibian immune system, we measured three immune parameters and plasma corticosterone (CORT), before and after inflicting a stressor (capture and captive confinement) on introduced cane toads (Rhinella marina) near their invasion front in Australia. Stress increased CORT levels, decreased complement lysis capacity, increased leukocyte oxidative burst, and did not change heterologous erythrocyte agglutination. The strength of the CORT response was positively correlated with leukocyte oxidative burst, and morphological features associated with invasiveness in cane toads (relative leg length) were correlated with stress responsiveness. No immune parameter that we measured was affected by a toad's infection by a parasitic nematode (Rhabdias pseudosphaerocephala), but the CORT response was muted in infected versus uninfected toads. These results illustrate the complex immune-stress interactions in wild populations of a non-traditional model vertebrate species, and describe immune adaptations of an important invasive species. PMID:22713726

  9. Preparation of intact chloroplasts by chemically induced lysis of the green alga Dunaliella marina.

    Science.gov (United States)

    Kombrink, E; Wöber, G

    1980-07-01

    A method for the isolation in high yield of intact chloroplasts from the unicellular green alga Dunaliella marina (Volvocales) is described. This procedure uses chemically induced lysis of cells with the polycationic macromolecules, DEAE-dextran (M=500,000) or poly-D,L-lysine (M=30,000-70,000). Reaction conditions were optimized with respect to obtaining a high yield of intact chloroplasts, after isopycnic centrifugation in a linear sucrose density gradient, by varying the concentration of polycation and the temperature and pH of incubation. Broken chloroplasts devoid of the stromal marker enzymes fructosebisphosphate phosphatase and ribulosebisphosphate carboxylase, but containing mitochondrial (fumarase) and microbody (catalase) contamination, were banded at a bouyant density of 1.18 g cm(-3). Intact chloroplasts, as indicated by their retention of alkaline fructosebisphosphate phosphatase and ribulosebisphosphate carboxylase, were found in 30% yield (chlorophyll in intact cells, 100%) at an equilibrium density of 1.24 g cm(-3). Contamination by cytoplasmic material (pyruvate kinase), mitochondria, and microbodies was less than 8% each. PMID:24306242

  10. 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.

  11. 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.

  12. Disturbance of benthic infauna by sediment-reworking activities of the lugworm Arenicola marina

    Science.gov (United States)

    Flach, E. C.

    The influence of the lugworm Arenicola marina on the abundance of other benthic species was studied in the westernmost part of the Wadden Sea. Small squares (1 m 2) within depopulated 144-m 2 plots were recolonized with various (naturally-occurring) lugworm densities (0-10-20-40-80 and 0-25-50-75-100 per m 2). These plots were sampled during the summer. Lugworms were found to have a strongly negative effect on the densities of C. volutator. At 0-density lugworms, the numbers of C. volutator were high. These were halved at 17 lugworms per m 2 ( i.e. the mean density on the tidal flats of the Dutch Wadden Sea), and were further reduced at higher lugworm densities ( e.g. 20% remained at 40 lugworms per m 2). Laboratory observations of Corophium behaviour in the presence of Arenicola suggest that sediment-reworking lugworms stimulate Corophium to emigrate. Effects of lugworms on other benthic species were also studied in the same way. Lugworms were found to have strongly negative effects on the juvenile densities of various worm and bivalve species ( Nereis diversicolor, Nephtys hombergii, Heteromastus filiformis, Scoloplos armiger, Pygospio elegans, Capitella capitata and Mya arenaria, Cerastoderma edule, Macoma balthica, Angulus tenuis, respectively).

  13. Distribuição da população e cobertura da terra: o lugar das Áreas Protegidas no Pará, Brasil em 2010

    Directory of Open Access Journals (Sweden)

    Álvaro de Oliveira D’Antona

    2015-12-01

    Full Text Available Resumo O objetivo deste artigo é analisar a distribuição da população do Pará, a partir de dados do Censo Demográfico 2010 associados a dados de uso e cobertura da terra do TerraClass, dispostos em uma grade estatística. Verifica-se o papel de 113 Áreas Protegidas (AP - 46 Terras Indígenas, 51 Unidades de Conservação de Uso Sustentável e 16 Unidades de Conservação de Proteção Integral - no gradiente rural-urbano do ponto de vista populacional e em relação aos usos-coberturas da terra nelas existentes. Utilizando um Sistema de Informações Geográficas, os dados relativos às APs, ao uso e cobertura da terra e os censitários foram incorporados à grade estatística. O relacionamento espacial dos planos de informação nas células indica que a população do estado é bastante concentrada, uma tendência que se reproduz nas Áreas Protegidas (o coeficiente de Gini para a distribuição dos domicílios é superior a 0,9. As APs configuram-se como áreas menos populosas e mais florestadas em comparação ao restante do estado. Apesar da presença de extensas porções sem domicílios ocupados e da maior extensão de florestas do Pará (57%, identificam-se nestas áreas usos urbanos associados a outros usos e coberturas da terra. Os resultados indicam que as dinâmicas populacionais e as mudanças nos usos e cobertura da terra estão relacionadas de forma mais ampla, estimulando a reflexão sobre a urbanização e as mudanças no uso e cobertura da terra de forma mais integrada.

  14. 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

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

    Directory of Open Access Journals (Sweden)

    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. 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.

  18. ANÁLISIS SOCIOECONÓMICO DE LA CUENCA DEL RIO CUALE, JALISCO, MÉXICO: UNA CONTRIBUCIÓN PARA LA DECLARACIÓN DEL ÁREA NATURAL PROTEGIDA RESERVA DE LA BIOSFERA EL CUALE

    Directory of Open Access Journals (Sweden)

    Jorge Téllez López

    2013-06-01

    Full Text Available Durante los meses de enero a mayo de 2013, a través de la metodología propuesta por Alciaturi (2009; se realizó el análisis de los factores socioeconómicos involucrados en la cuenca del rio Cuale, Jalisco, México. Los resultados incluyeron aspectos relacionados con la dinámica demográfica, grado de marginación, nivel educativo, población económicamente activa, principales actividades económicas, comunidades rurales, descripción socioeconómica, potenciales de los recursos naturales, usos y aprovechamientos actuales; así como la situación jurídica de la tenencia de la tierra. El objetivo de esta investigación es conocer cómo estos factores inciden sobre los recursos naturales de la cuenca. Con la finalidad de utilizar esta información para establecer la declaratoria del Área Natural Protegida Reserva de la Biosfera El Cuale, que es una herramienta que puede ayudar a asegurar la conservación de esta zona. Por lo tanto, se han incluido elementos de análisis social, económico y ambiental, puesto que estos factores han resultado determinantes en los procesos que inciden en la deforestación y cambio de uso de suelo.

  19. Interpretación socioambiental (ISA, herramienta para la gestión del uso público en las áreas protegidas. Estudio de caso: Parque Nacional Marino Las Baulas de Guanacaste, Costa Rica

    Directory of Open Access Journals (Sweden)

    Olga Lucía Hernández

    2013-12-01

    Full Text Available El Parque Nacional Marino Las Baulas de Guanacaste, como muchas otras Áreas Protegidas del todo el mundo, está siendo objeto de una visitación sin precedentes. Ante este escenario, las comunidades aledañas son incorporadas en las iniciativas turísticas de base natural, como parte de la estrategia de aplicación del enfoque ecosistémico. Pero la realidad es mucho más compleja que esta simple fórmula de participación. ¿Están preparadas estas poblaciones para tal labor? ¿Pueden los guías locales despertar cierto interés por la conservación en un Tour? A través de la práctica de la investigación-acción, el tour de anidamiento de la tortuga baula (Demorchelys coriácea fue objeto de análisis de forma participativa con los agentes turísticos. El proceso indagatorio se realizó bajo el prisma de la Interpretación Socioambiental, como herramienta para la gestión del uso público en zonas de especial protección. El estudio reveló su efectividad así como el papel clave que representan las comunidades locales en este tipo de iniciativas.

  20. Deterioration of eelgrass, Zostera marina L., meadows by water pollution in Seto Inland Sea, Japan

    Energy Technology Data Exchange (ETDEWEB)

    Tamaki, Hitoshi; Tokuoka, Makoto; Nishijima, Wataru; Terawaki, Toshinobu; Okada, Mitsumasa

    2002-11-01

    Survival of transplanted Zostera marina L. (eelgrass) and environmental conditions (water quality, bottom sediments, sedimentation on leaves and flow regime) were studied concurrently in the center, edge, and at the outside of a eelgrass meadow located in a eutrophic coastal zone in northern Hiroshima Bay, Seto Inland Sea, Japan. Eelgrass transplants at the outside of the meadow declined significantly, whereas those at the center were consistently well established. Silt content in the bottom sediments at the outside was higher than that at the center. The sediment was oxic from the surface to 2 cm deep at the center, whereas those at the edge and the outside were reductive almost from the surface. The sediment characteristics typical in eutrophic water seemed to be a factor responsible for the deterioration of eelgrass meadows. Although suspended solid concentrations in the water columns were almost the same, the amount of sediments deposited on leaves of eelgrass at the outside was higher than that at the center of the meadow. The amount of the deposition at the outside seems to be enough to inhibit photosynthesis; i.e. photosynthetic photon flux density (PPFD) available for eelgrass was only 36% of that without any deposition. The deposition in the center, however, was small enough to allow 84% of the original PPFD. Flow rates, determined at 30 cm above the bottom, a half height of average eelgrass, suggested that the rate at the outside was not enough to remove deposited sediments from the surface of eelgrass leaves. Thus, the large amount of sediment deposition caused by water pollution and/or eutrophication seemed to be another factor to inhibit the survival of eelgrass at the outside edge of the meadow.

  1. Deterioration of eelgrass, Zostera marina L., meadows by water pollution in Seto Inland Sea, Japan

    International Nuclear Information System (INIS)

    Survival of transplanted Zostera marina L. (eelgrass) and environmental conditions (water quality, bottom sediments, sedimentation on leaves and flow regime) were studied concurrently in the center, edge, and at the outside of a eelgrass meadow located in a eutrophic coastal zone in northern Hiroshima Bay, Seto Inland Sea, Japan. Eelgrass transplants at the outside of the meadow declined significantly, whereas those at the center were consistently well established. Silt content in the bottom sediments at the outside was higher than that at the center. The sediment was oxic from the surface to 2 cm deep at the center, whereas those at the edge and the outside were reductive almost from the surface. The sediment characteristics typical in eutrophic water seemed to be a factor responsible for the deterioration of eelgrass meadows. Although suspended solid concentrations in the water columns were almost the same, the amount of sediments deposited on leaves of eelgrass at the outside was higher than that at the center of the meadow. The amount of the deposition at the outside seems to be enough to inhibit photosynthesis; i.e. photosynthetic photon flux density (PPFD) available for eelgrass was only 36% of that without any deposition. The deposition in the center, however, was small enough to allow 84% of the original PPFD. Flow rates, determined at 30 cm above the bottom, a half height of average eelgrass, suggested that the rate at the outside was not enough to remove deposited sediments from the surface of eelgrass leaves. Thus, the large amount of sediment deposition caused by water pollution and/or eutrophication seemed to be another factor to inhibit the survival of eelgrass at the outside edge of the meadow

  2. On the profile evolution of three artificial pebble beaches at Marina di Pisa, Italy

    Science.gov (United States)

    Bertoni, Duccio; Sarti, Giovanni

    2011-07-01

    In this paper, the profiles of three artificial coarse-grained beaches located at Marina di Pisa (Tuscany, Italy) were monitored from April 2008 to May 2009 in order to define the response of the beaches to major storms that occurred during the study. Two beaches are similar, the third differs in length and in the level of protection, being less than half the length of the others and devoid of an offshore submerged breakwater. The work was achieved by means of accurate topographic surveys intended to reconstruct the beach profile from the backshore up to the foreshore-upper shoreface transition (step). The surveys were performed with an RTK-GPS instrument, which provided extremely precise recording of the beach. The most significant features of the beaches were tracked during each survey; in particular, the landward foot of the storm berm, the crest of the storm berm, the coastline, and the step crest were monitored. Five cross-shore transects were traced on each beach. Along these transects, any meaningful slope change was recorded to obtain accurate sections of the beach. The field datasets were processed with AutoCAD software to compare the beach profile evolution during the year-long research. The results showed a comparable evolution of the twin beaches: the resulting storm berm retreat of about 15 to 19 m is a remarkable feature considering the coarse grain size and the offshore protection. Due to the absence of the breakwater, the third beach was characterized by even higher values of recession (over 20 m), and showed hints of wave reflection-related processes after the huge, steep storm berm had been formed and grown after the high energy events. These processes were not as evident on the twin beaches. These results underline the different response of three similar protection schemes, and the importance that frequent monitoring of the beach morphology holds when it comes to coastal management issues.

  3. 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.

  4. Evidence of additional excitation energy transfer pathways in the phycobiliprotein antenna system of Acaryochloris marina.

    Science.gov (United States)

    Nganou, A C; David, L; Adir, N; Pouhe, D; Deen, M J; Mkandawire, M

    2015-02-01

    To improve the energy conversion efficiency of solar organic cells, the clue may lie in the development of devices inspired by an efficient light harvesting mechanism of some aquatic photosynthetic microorganisms that are adapted to low light intensity. Consequently, we investigated the pathways of excitation energy transfer (EET) from successive light harvesting pigments to the low energy level inside the phycobiliprotein antenna system of Acaryochloris marina, a cyanobacterium, using a time resolved absorption difference spectroscopy with a resolution time of 200 fs. The objective was to understand the actual biochemical process and pathways that determine the EET mechanism. Anisotropy of the EET pathway was calculated from the absorption change trace in order to determine the contribution of excitonic coupling. The results reveal a new electron energy relaxation pathway of 14 ps inside the phycocyanin component, which runs from phycocyanin to the terminal emitter. The bleaching of the 660 nm band suggests a broader absorption of the terminal emitter between 660 nm and 675 nm. Further, there are trimer depolarization kinetics of 450 fs and 500 fs in high and low ionic strength, respectively, which arise from the relaxation of the β84 and α84 in adjacent monomers of phycocyanin. Under conditions of low ionic strength buffer solution, the evolution of the kinetic amplitude during the depolarization of the trimer is suggestive of trimer conservation within the phycocyanin hexamer. The anisotropy values were 0.38 and 0.40 in high and in low ionic strength, respectively, indicating that there is no excitonic delocalization in the high energy level of phycocyanin hexamers. PMID:25470281

  5. Zooshikella marina sp. nov. a cycloprodigiosin- and prodigiosin-producing marine bacterium isolated from beach sand.

    Science.gov (United States)

    Ramaprasad, E V V; Bharti, Dave; Sasikala, Ch; Ramana, Ch V

    2015-12-01

    A red-pigmented bacterium producing a metallic green sheen, designated strain JC333T, was isolated from a sand sample collected from Shivrajpur-Kachigad beach, Gujarat, India. Phylogenetic analyses based on the 16S rRNA gene sequence of strain JC333T showed highest sequence similarity to Zooshikella ganghwensis JC2044T (99.24 %) and less than 91.94 % similarity with other members of the class Gammaproteobacteria. DNA-DNA hybridizations between JC333T and Z. ganghwensis JC2044T showed low relatedness values of 19 ± 1.3 % (reciprocal 21 ± 2.2 %). The major respiratory quinone was ubiquinone-9 (Q9) and the polar lipid profile was composed of the major components diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, an unidentified aminophospholipid and an unidentified lipid. The presence of C16 : 1ω7c/C16 : 1ω6c, C16 : 0, C18 : 1ω7c and C12 : 0 as major fatty acids supported the affiliation of strain JC333T to the genus Zooshikella. Prodigiosin, cycloprodigiosin and eight other prodigiosin analogues were the pigments of JC333T. Characterization based on 16S rRNA gene sequence analysis, physiological parameters, pigment analysis, ubiquinone, and polar lipid and fatty acid compositions revealed that JC333T represents a novel species of the genus Zooshikella, for which the name Zooshikella marina sp. nov. is proposed. The type strain is JC333T ( = KCTC 42659T = LMG 28823T). PMID:26409875

  6. Dr. Zompo: an online data repository for Zostera marina and Posidonia oceanica ESTs.

    Science.gov (United States)

    Wissler, L; Dattolo, E; Moore, A D; Reusch, T B H; Olsen, J L; Migliaccio, M; Bornberg-Bauer, E; Procaccini, G

    2009-01-01

    As ecosystem engineers, seagrasses are angiosperms of paramount ecological importance in shallow shoreline habitats around the globe. Furthermore, the ancestors of independent seagrass lineages have secondarily returned into the sea in separate, independent evolutionary events. Thus, understanding the molecular adaptation of this clade not only makes significant contributions to the field of ecology, but also to principles of parallel evolution as well. With the use of Dr. Zompo, the first interactive seagrass sequence database presented here, new insights into the molecular adaptation of marine environments can be inferred. The database is based on a total of 14 597 ESTs obtained from two seagrass species, Zostera marina and Posidonia oceanica, which have been processed, assembled and comprehensively annotated. Dr. Zompo provides experimentalists with a broad foundation to build experiments and consider challenges associated with the investigation of this class of non-domesticated monocotyledon systems. Our database, based on the Ruby on Rails framework, is rich in features including the retrieval of experimentally determined heat-responsive transcripts, mining for molecular markers (SSRs and SNPs), and weighted key word searches that allow access to annotation gathered on several levels including Pfam domains, GeneOntology and KEGG pathways. Well established plant genome sites such as The Arabidopsis Information Resource (TAIR) and the Rice Genome Annotation Project are interfaced by Dr. Zompo. With this project, we have initialized a valuable resource for plant biologists in general and the seagrass community in particular. The database is expected to grow together with more data to come in the near future, particularly with the recent initiation of the Zostera genome sequencing project.The Dr. Zompo database is available at http://drzompo.uni-muenster.de/ PMID:20157482

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

    OpenAIRE

    Pérez López, M.; M.C Nóvoa; J. Alonso; M. A. García Fernández; M.J. Melgar

    2003-01-01

    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 entr...

  8. A reescrita de mitos femininos na obra de Marina Warner : metamorfose, género e identidade

    OpenAIRE

    Santos, Lucília Ramos dos

    2011-01-01

    Dissertação de mestrado em Estudos Ingleses O trabalho de Marina Warner é marcado pelo imperativo pós-moderno do “eternal return”, associado ao processo de recontar e de reescrita, por forma a criar um universo narrativo aberto à renovação e instabilidade ilimitadas. A linguagem mítica, com a sua fluidez e flexibilidade, mais a sua relevância na construção e desconstrução da realidade, pode ser considerada um recurso eficaz no processo de reescrita, na metamorfose de um mund...

  9. Línea base de conocimiento sobre el estado actual de las tortugas marinas en el Ecuador

    OpenAIRE

    Coello, Dialhy; Herrera, Marco

    2011-01-01

    Como respuesta a la solicitud formulada por La Comisión Permanente del Pacífico Sur a los Puntos Focales Nacionales para desarrollar Consultorías sobre de tortugas marinas en los países del Pacífico Sudeste, el Instituto Nacional de Pesca de Ecuador fue seleccionado para realizar una consultoría nacional con el objetivo establecer una línea base del conocimiento del estado actual de las tortugas en el Ecuador. Entre los principales resultados obtenidos tenemos que el conocimiento sobre las...

  10. Two-dimensional electrophoresis of Arenicola marina extracellular hemoglobin: separation of chains with identical molecular mass but different isoelectric point.

    Science.gov (United States)

    Slitine, F E; Toulmond, A

    1991-01-01

    1. On the basis of their molecular masses, four types of polypeptides (A, B, C, D) were obtained by SDS-PAGE of the extracellular hemoglobin of the polychaete annelid Arenicola marina. 2. On 2-dimensional polyacrylamide gel electrophoresis, the erythrocruorin dissociated into six different types of polypeptide chains; A1, A2, B1, B2, C and D. 3. A1 and B1 migrate in 2-dimensional electrophoresis at the same position as alpha and beta chains of human hemoglobin. PMID:1814687

  11. Actividad antinociceptiva, anti-inflamatoria y relajante muscular de (+)-curcufenol aislado de la esponja marina didiscus oxeata

    OpenAIRE

    Salama, Ahmed; Toscano, Mariela; Del Valle, Martha; Vargas, Erika

    2008-01-01

    Mediante el método de edema plantar inducido por carragenina en la pata de la rata, (+)-curcufenol aislado de la esponja marina Didiscus oxeata mostró una actividad antiinflamatoria moderada, en las dosis de 100, 150 y 200 mg/kg administradas por vía oral, mientras que la actividad antinociceptiva fue confirmada por el método de contorsiones inducidas por ácido acético en ratones mostrando un efecto analgésico muy alto, en las dosis de 50, 100, 150 y 200 mg/kg administradas por vía oral, en c...

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

    Directory of Open Access Journals (Sweden)

    Daniel B.A. Castro

    2015-09-01

    Full Text Available 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.

  13. Plant Growth Promoting of Endophytic Sporosarcina aquimarina SjAM16103 Isolated from the Pneumatophores of Avicennia marina L.

    OpenAIRE

    S. Rylo Sona Janarthine; Eganathan, P.

    2012-01-01

    Endophytic Sporosarcina aquimarina SjAM16103 was isolated from the inner tissues of pneumatophores of mangrove plant Avicennia marina along with Bacillus sp. and Enterobacter sp. Endophytic S. aquimarina SjAM16103 was Gram variable, and motile bacterium measured 0.6–0.9  μ m wide by 1.7–2.0  μ m long and light orange-brown coloured in 3-day cultures on tryptone broth at 26°C. Nucleotide sequence of this strain has been deposited in the GenBank under accession number GU930359. This endophytic ...

  14. Migración de las aves marinas por el Cabo de Higer. Otoño 1984.

    OpenAIRE

    RIOFRIO, J., BELZUNCE, J.A., CANOSA, P.

    1988-01-01

    Se ha estudiado la migración visible de las aves marinas por el   cabo de Higer durante el otoño de 1984 analizando la migración a   lo largo del día y a lo largo del período estudiado. De las 34   especies registradas durante el trabajo de campo se han analizado   12, aquellas que poseen un nivel de presencia suficiente, así   como la cantidad total de migrantes. Excepto P. carbo y S. sandvicensis, todas las demás especies   analizadas concentran durante la primera mitad...

  15. Alternativa de biofertilizante como medio de cultivo para el crecimiento poblacional de dos microalgas marinas empleadas en la camaronicultura

    OpenAIRE

    Guerra Aznay, M.; Pérez Jar, L.; Leal Lorenzo, S.; Jaime Ceballos, B.; Jiménez Cabrera, R.; Pérez Díaz, S.; Bobadilla González, J.

    2012-01-01

    Con el propósito de evaluar el humus de lombriz roja californiana Eisenia foetida como biofertilizante para el crecimiento poblacional de dos microalgas marinas, fueron cultivadas Tetraselmis tetrathele y Chaetoceros muelleri en agua de mar enriquecida con cuatro diluciones (50; 200; 350 y 500 mL) de extracto líquido de humus. La especie T. tetrathele, cultivada en la dilución de 200 mL, no mostró diferencias con el patrón medio f/2 Guillard para los parámetros: concentración celu...

  16. Composición quimica y actividad antifouling de la fraccion lipidica de la esponja marina cliona tenuis (clionidae)

    OpenAIRE

    Leonardo Castellanos; Carmenza Duque

    2009-01-01

    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 ...

  17. 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...... of active irrigation lasting approximately 15 min separated by a 15 min rest period. The mean pumping rate during irrigation was 52 ml h-1. Oxygen dynamics and distribution around the tail shaft was closely related to irrigation pattern but independent of pumping rate. During irrigation the oxygen...

  18. Contaminación marina en las bahías de Paita y Talara en setiembre 1996.

    OpenAIRE

    Enriquéz, Edgardo; Orozco, Rita; Castillo, Sonia; Fernández, Elizabeth; Morón, Octavio

    1999-01-01

    Informe que muestra los estudios de los efectos de la contaminación marina sobre el macrozoobentos de fondo blando de aguas someras. Ademas se evaluó la calidad microbiológica y la demanda bioquimica de oxigeno (DBO) en agua de mar y a nivel de playas. Se determinó que el agua de mar no presenta contaminación microbiológica según los resultados de coliformes totales y fecales. Sin embargo, a nivel de playas en la bahía de Paita, se detectaron dos áreas afectadas por altos niveles de colifo...

  19. Desarrollo de sistemas de alerta y de métodos de identificación y detección de toxinas marinas

    OpenAIRE

    Rodríguez Louro, Paula

    2012-01-01

    Las toxinas marinas son productos secundarios con actividad tóxica, originados por el metabolismo de algunas especies de microalgas fitoplanctónicas (dinoflagelados, diatomeas y cianobacterias) y también ciertas bacterias. Las toxinas son concentradas preferentemente por la filtración de los bivalvos y encontradas en moluscos, peces, crustáceos y en diversos animales acuáticos como consecuencia de su distribución en la cadena alimentaria marina. El incremento en la frecuencia de las florac...

  20. Revisión crítica de los estudios sobre biogeografía de macroalgas marinas del Mediterráneo.

    OpenAIRE

    Vargas, J. M.; Real, Raimundo; Flores-Moya, Antonio; Báez, José C.

    2004-01-01

    Revisión crítica de los estudios sobre biogeografía de macroalgas marinas del Mediterráneo. Teniendo en cuenta los procedimientos metodológicos que se siguen en los estudios biogeográficos, se reconocen tres tipos básicos de aproximaciones: biogeografía descriptiva, biogeografía narrativa y biogeografía analítica. En este trabajo se analizan las aportaciones realizadas a la ficogeografía de las macroalgas marinas del mar Mediterráneo, atendiendo a cada una de las tres aproximaciones posibles....

  1. Presencia de bacterias asociadas a nieve marina en arrecifes influenciados por escorrentía continental del Caribe colombiano: primer acercamiento

    OpenAIRE

    Hernán Alejandro Henao-Castro; Elvira M. Alvarado Ch; Laura C. Rodríguez; Johanna Santamaría

    2015-01-01

    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 d...

  2. El trabajo en la marina mercante española en la transición de la vela al vapor (1834-1914)

    OpenAIRE

    Garcia i Domingo, Enric, 1962-

    2013-01-01

    El objeto de estudio es la Marina mercante española (en concreto las tripulaciones) durante la transición de la vela al vapor. El marco cronológico se sitúa entre 1834 (primera línea regular estable con buques de vapor) y 1914 (cuando el proceso de mecanización ya se puede dar por acabado). Aunque con referencias a un marco internacional más amplio, se analiza el caso español focalizando en la marina catalana porque durante el proceso el centro de gravedad de las actividades marítimas estaba ...

  3. Foraging range, habitat use and minimum flight distances of East Atlantic Light-bellied Brent Geese Branta bernicla hrota in their spring staging areas

    DEFF Research Database (Denmark)

    Clausen, Kevin Kuhlmann; Clausen, Preben; Hounisen, Jens Peder; Vissing, Marie Silberling; Fox, Anthony David

    habitats. This might reflect changes in habitat availability, and is probably related to significant declines in Common Eelgrass Zostera marina in both these areas. From a historically rather sedentary lifestyle, which centred around foraging on Zostera beds in fjord habitats, this population now feeds on...

  4. Governança territorial em zonas costeiras protegidas: uma avaliação exploratória da experiência catarinense

    Directory of Open Access Journals (Sweden)

    Melissa Vivacqua

    2009-01-01

    Full Text Available This paper offers subsidies for academic debate about the viability of alternative development strategies in protected coastal areas, in the current asymmetrical globalization scenario. The line of reasoning stresses the application of the sustainable territorial development concept for the integrated and participatory coastal areas management system process in course in the Santa Catarina State. The first part presents an overall view of the regulation process of the tools used in the Brazilian Protected Areas Management System. The paper also presents a synthesis of the building process of the “Integrated Management of Marine-Coastal Protected Areas in Santa Catarina State” project. Then, it explores the potential of a territorial development framework to integrate the National Protected Areas System and the National Coastal Management Plan. It ends with the rationale used to justify the need for more substantial investments in political-ecological research on socio-environmental conflict mediation and promotion of territorial governance systems in these areas.

  5. 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.

  6. 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%) toads were parasitized by one 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 two 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. dissimile was significantly more abundant during the dry season.

  7. 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 L.; Sage, George K; Rearick, Jolene R.; Fowler, Meg C.; Muñiz-Salazar, Raquel; Baibak, Bethany; Wyllie-Echeverria, Sandy; Cabello-Pasini, Alejandro; 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. PMID:27104836

  8. Rhizosphere of Avicennia marina (Forsk.) Vierh. as a landmark for polythene degrading bacteria.

    Science.gov (United States)

    Shahnawaz, Mohd; Sangale, Manisha K; Ade, Avinash B

    2016-07-01

    Due to high durability, cheap cost, and ease of manufacture, 311 million tons of plastic-based products are manufactured around the globe per annum. The slow/least rate of plastic degradation leads to generation of million tons of plastic waste per annum, which is of great environmental concern. Of the total plastic waste generated, polythene shared about 64 %. Various methods are available in the literature to tackle with the plastic waste, and biodegradation is considered as the most accepted, eco-friendly, and cost-effective method of polythene waste disposal. In the present study, an attempt has been made to isolate, screen, and characterize the most efficient polythene degrading bacteria by using rhizosphere soil of Avicennia marina as a landmark. From 12 localities along the west coast of India, a total of 123 bacterial isolates were recorded. Maximum percent weight loss (% WL; 21.87 ± 6.37 %) was recorded with VASB14 at pH 3.5 after 2 months of shaking at room temperature. Maximum percent weight gain (13.87 ± 3.6 %) was reported with MANGB5 at pH 7. Maximum percent loss in tensile strength (% loss in TS; 87.50 ± 4.8 %) was documented with VASB1 at pH 9.5. The results based on the % loss in TS were only reproducible. Further, the level of degradation was confirmed by scanning electron microscopic (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis. In SEM analysis, scions/crakes were found on the surface of the degraded polythene, and mass of bacterial cell was also recorded on the weight-gained polythene strips. Maximum reduction in carbonyl index (4.14 %) was recorded in untreated polythene strip with Lysinibacillus fusiformis strain VASB14/WL. Based on 16S ribosomal RNA (rRNA) gene sequence homology, the most efficient polythene degrading bacteria were identified as L. fusiformis strainVASB14/WL and Bacillus cereus strain VASB1/TS. PMID:27072028

  9. Impact of polychaetes (Nereis spp. and Arenicola marina on carbon biogeochemistry in coastal marine sediments†

    Directory of Open Access Journals (Sweden)

    Kristensen Erik

    2001-10-01

    Full Text Available Known effects of bioturbation by common polychaetes (Nereis spp. and Arenicola marina in Northern European coastal waters on sediment carbon diagenesis is summarized and assessed. The physical impact of irrigation and reworking activity of the involved polychaete species is evaluated and related to their basic biology. Based on past and present experimental work, it is concluded that effects of bioturbation on carbon diagenesis from manipulated laboratory experiments cannot be directly extrapolated to in situ conditions. The 45–260% flux (e.g., CO2 release enhancement found in the laboratory is much higher than usually observed in the field (10–25%. Thus, the faunal induced enhancement of microbial carbon oxidation in natural sediments instead causes a reduction of the organic matter inventory rather than an increased release of CO2 across the sediment/water interface. The relative decrease in organic inventory (Gb/Gu is inversely related to the relative increase in microbial capacity for organic matter decay (kb/ku. The equilibrium is controlled by the balance between organic input (deposition of organic matter at the sediment surface and the intensity of bioturbation. Introduction of oxygen to subsurface sediment and removal of metabolites are considered the two most important underlying mechanisms for the stimulation of carbon oxidation by burrowing fauna. Introduction of oxygen to deep sediment layers of low microbial activity, either by downward irrigation transport of overlying oxic water or by upward reworking transport of sediment to the oxic water column will increase carbon oxidation of anaerobically refractory organic matter. It appears that the irrigation effect is larger than and to a higher degree dependent on animal density than the reworking effect. Enhancement of anaerobic carbon oxidation by removal of metabolites (reduced diffusion scale may cause a significant increase in total sediment metabolism. This is caused by three

  10. 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

  11. The filtration activity of a serpulid polychaete population ( Ficopomatus enigmaticus (Fauvel) and its effects on water quality in a coastal marina

    Science.gov (United States)

    Davies, B. R.; Stuart, V.; de Villiers, M.

    1989-12-01

    An estimate of the total standing stock of Ficopomatus enigmaticus (Fauvel) in the Marina da Gama, Zandvlei, near Cape Town was made, and some aspects of the animals' filter-feeding behaviour investigated. Working on values of 5·23 g dry mass of worm (excluding tube) m -2 on the submerged aquatic plant Potamogeton pectinatus L., plus 84·9 g m -2 on the canal walls, the total standing stock of the serpulid was estimated at 2·88±2·24 t (1·4 t on Potamogeton; 1·48 t on canal walls). At the average particle concentrations of Marina water of 5·27 mg l -1, the clearnace rate of F. enigmaticus was 8·59 ml mg -1 worm h -1, resulting in an ingestion rate of 45·27 mg mg -1 worm h -1 of particles in the size range 2-16 μm. Clearance and ingestion rates both increased in direct proportion to food concentration. Using estimates of total standing stocks within the Marina, the F. enigmaticus population clears 2·47 × 10 7 l of water h -1 and consumes 1·3 × 10 8 mg of particles h -1 in the 2-16 μm size range. Thus, the entire volume of the Marina will be filtered in 26·1 h through the activities of this animal alone, illustrating its importance for the maintenance of water quality within this moderately polluted system.

  12. La construcción del paisaje ibérico: aproximación SIG al territorio protohistórico de la Marina Alta

    Directory of Open Access Journals (Sweden)

    Ignacio Grau Mira

    2004-01-01

    Full Text Available Análisis del modelo de ocupación y los patrones de asentamiento en los inicios de la época ibérica en la comarca de la Marina Alta, en el N de la provincia de Alicante, mediante la utilización de los SIG.

  13. Características da carcaça de bovinos de quatro grupos genéticos submetidos a dietas com ou sem adição de gordura protegida Carcass characteristics of bovines from four genetic groups fed diets with or without protected fat

    Directory of Open Access Journals (Sweden)

    Soraya Maria Palma Luz Jaeger

    2004-12-01

    Full Text Available Com o objetivo de avaliar o rendimento e as características de carcaça de quatro grupos genéticos de bovinos, foram abatidos 32 animais machos inteiros, dos grupos Nelore (N, F1 Canchim x Nelore (CN, F1 Limousin x Nelore (LN e F1 Aberdeen Angus x Nelore (AN, com idade aproximada de 19 meses e peso vivo médio de 558 kg, terminados em regime de confinamento, recebendo dietas com ou sem adição de gordura protegida, durante 166 dias. O delineamento experimental utilizado foi inteiramente casualizado, com quatro repetições, seguindo esquema fatorial 2 x 4 (dieta, grupo genético. Observou-se efeito do grupo genético sobre o rendimento de cortes primários, tendo o grupo AN apresentado as maiores médias de dianteiro (41,65% e ponta de agulha (13.90% e o grupo LN, o maior rendimento de traseiro (47,40%. A área de olho de lombo (AOL sofreu efeito da dieta, apresentando médias de 81,31 cm² vs. 88,50cm², para as dietas sem e com gordura protegida, respectivamente. A composição física da carcaça foi influenciada pelo grupo genético, tendo o grupo LN apresentado a maior porcentagem de músculo (63,62% e a menor porcentagem de tecido adiposo (21,65%, enquanto o grupo Nelore apresentou a maior porcentagem de tecido adiposo (28,28% e menor porcentagem de músculo (56,76%. A composição química da seção HH sofreu efeito do grupo genético, tendo sido observados os maiores teores de proteína bruta nos grupos LN (27,24% e CN (26,10% e de extrato etéreo no grupo Nelore (68,35%, que não diferiu do grupo AN (68,02%. Os menores teores de Ca, P e Mg (2,62; 1,32; e 0,081% foram observados no grupo Nelore.The objective of this experiment was to evaluate the yield and carcass characteristics of steers from the following four genetic group: Nellore (N, F1 Canchim x Nellore (CN, F1 Limousin x Nellore (LN and F1 Aberdeen Angus x Nellore (NA. For this purpose, 32 steers, with age of 19 months and live weight average of 558 kg, raised in confinement

  14. Desarrollo, gestión de áreas protegidas y población local. El Parque Rural de Anaga (Tenerife, España

    Directory of Open Access Journals (Sweden)

    Rodríguez Darias, Alberto Jonay

    2007-01-01

    Full Text Available As an answer to the exportation of the concept of “development”, identified with the capitalist model of production and consumption, a series of approaches that draw our attention to the degradation of the natural resources are being generated. As a consequence, the number of designated natural protected areas in the world has considerably grown in the past decades. Declaring these areas as protected also restricts the use of their natural resources. Such restrictions can stand in the way of the social and economic development of communities that have lived in these now protected territories for centuries and relied on their wealth to survive. Therefore, it is a challenge for the international community to encourage the local population to take part in the planning and management of protected areas and to strengthen the potential development of these areas

  15. Desarrollo, gestión de áreas protegidas y población local. El Parque Rural de Anaga (Tenerife, España)

    OpenAIRE

    Rodríguez Darias, Alberto Jonay

    2007-01-01

    As an answer to the exportation of the concept of “development”, identified with the capitalist model of production and consumption, a series of approaches that draw our attention to the degradation of the natural resources are being generated. As a consequence, the number of designated natural protected areas in the world has considerably grown in the past decades. Declaring these areas as protected also restricts the use of their natural resources. Such restrictions can stand in the way of ...

  16. Impacto ambiental del turismo en áreas naturales protegidas; procedimiento metodológico para el análisis en el Parque Estatal El Ocotal, México

    Directory of Open Access Journals (Sweden)

    Carlos Pérez Ramírez

    2009-01-01

    Full Text Available En la actualidad, la actividad turística es promovida ampliamente en las áreas naturales protegidas, como una importante estrategia para el aprovechamiento de los recursos naturales, sustentada en el argumento del limitado impacto ambiental generado en el entorno natural. No obstante, la excesiva acumulación del número de visitantes en determinadas temporadas al año, así como la realización de actividades recreativas sin control alguno en determinados espacios naturales, ha propiciado la generación de significativos impactos ambientales. Tal es el caso del Parque Estatal El Ocotal (PEEO, ubicado en el Municipio de Timilpan, Estado de México, el cual desde su creación ha contemplado el desarrollo de las actividades turísticas como eje del aprovechamiento de los recursos, sin tomar en cuenta medidas enfocadas a la reducción de las implicaciones generadas. De esta forma, la investigación tuvo como principal objetivo, analizar las repercusiones ambientales de la actividad turística en el PEEO, con la finalidad de proponer una serie de medidas de mitigación sobre las características negativas, que permitan conservar las condiciones ambientales del lugar, así como potencializar los aspectos positivos que aseguren el adecuado desarrollo de la actividad turística. Para alcanzar dicho objetivo se emplearon dos instrumentos de evaluación: lista de verificación y matriz cruzada de impacto ambiental aplicada al turismo.

  17. Patagonia, de margen exótico a periferia turística. Una mirada sobre un área natural protegida de frontera

    Directory of Open Access Journals (Sweden)

    Paula Gabriela Núñez

    2012-01-01

    Full Text Available During the first half of the twentieth century, National Parks in Argentina were located in peripheral border spaces. This configuration responded to previous territorial organization logics developed in the country. In order to analyze the impact and influence of these Natural Protected Areas, the Nahuel Huapi National Park (Andean Patagonia, Argentina case study was considered. It was concluded that, in the region of the Nahuel Huapi, the centralization in the national territorial administration was consolidated through the institutionalization of a Natural Protected Area. Moreover, this process allowed the identification of different approaches from which local planning development and tourism were thought over time, affecting the way Natural Protected Areas were conceived.

  18. Quality uncertainty and allocation of decision rights in the European protected designation of origin Incertidumbre sobre la calidad y asignación de derechos de decisión en la denominación de origen protegida europea Incerteza da qualidade e atribuição de direitos de decisão na designação de origem protegida europeia

    Directory of Open Access Journals (Sweden)

    Gaetano Martino

    2013-06-01

    Full Text Available The paper considers some issue in the governance of the European Protected Designation of Origin (PDO. The PDO systems are the outcomes of both farmers and consumers expectations and connect the valorisation of the agricultural and rural resources of given territories to the quality of typical products. A critical point in the governance of the PDO systems is represented by the connection between the quality strategies and the uncertainty. The paper argues that the PDO systems can be thought of as strictly coordinated subsystems in which the ex post governance play a critical role in coping with quality uncertainty. The study suggests that the society's inducements given raise to complex organizational systems in which the allocation of decision rights to PDO collective organizations play a major role. The empirical analysis is carried out by examining ten Italian PDO systems in order to identify the decision rights allocated.Se consideran aquí algunos problemas en el gobierno de la denominación de origen protegida (DOP europea. Los sistemas de DOP resultan de las expectativas de agricultores y consumidores y establecen una relación entre la valoración de los recursos agrícolas y rurales de determinados territorios y la calidad de los productos típicos. Un punto crítico en la gestión de los sistemas DOP está representado por la relación entre las estrategias de calidad y la incertidumbre. En este estudio se argumenta que los sistemas DOP pueden ser vistos como subsistemas estrictamente coordenados, en los que el gobierno ex post desempeña un papel fundamental para hacer frente a la incertidumbre sobre la calidad. Se sugiere que los incentivos de la sociedad crean sistemas organizacionales complejos en los que la asignación de derechos de decisión a organizaciones colectivas de DOP representa un importante papel. Se lleva a cabo un estudio empírico por medio del análisis de diez sistemas DOP italianos, con el fin de identificar los

  19. Low absorption state of phycocyanin from Acaryochloris marina antenna system: On the interplay between ionic strength and excitonic coupling

    Science.gov (United States)

    Nganou, Collins

    2013-07-01

    This paper studies the excitonic factor in the excited state energy transfer of phycobilisome (PBS) by using a polarized time-resolved pump-probe and by changing the ionic strength of the cofactors' medium in the PBS of Acaryochloris marina (A. marina). As a result, the interplay between the surrounding medium and the closely excited adjacent cofactors is shown to be a negligible factor of the excitonic decay kinetics at 618 nm of the phycocyanin (PC), while it appears as a driving factor of an increase in excitonic delocalization at 630 nm. The obtained anisotropy values are consistent with the contribution of ionic strength in the excitonic mechanism in PBS. These values were 0.38 in high ionic strength and 0.4 in low ionic strength at 618 nm, and 0.52 in high ionic strength and 0.4 in low ionic strength at 630-635 nm. The anisotropy value of 0.52 in high phosphate is similar at 630 nm and 635 nm, which is consistent with an excitonic delocalization band at 635 nm. The 635 nm band is suggested to show the true low energy level of PC in A. marina PBS. The anisotropy decay kinetic at 630 nm suggests that the excited state population of PC is not all equilibrated in 3 ps because of the existence of the 10 ps decay kinetic component. The presence of the slow kinetic decay component in high, and low ionic strength, is consistent with a 10 and 14 ps energy transfer pathway, while the 450 fs kinetic decay component is consistent with the presence of an additional excitation energy transfer pathway between adjacent α84 and β84. Furthermore, the 450 fs decay kinetic is suggested to be trapped in the trimer, while the 400 fs decay kinetic rules out an excitonic flow from low energy level PC to allophycoyanin. This excitonic flow may occur between β84 in adjacent trimers, towards the low energy state of the PBS rod.

  20. Impacts of mercury stress on Avicennia marina seedlings eco-physiology%汞胁迫对白骨壤(Avicennia marina)幼苗生理生态的影响

    Institute of Scientific and Technical Information of China (English)

    袁彦婷; 丁振华; 张玲

    2011-01-01

    In order to understand the heavy metals resistance mechanism of mangrove, a stress experiment with the seedlings of mangrove species Avicennia marina from Fujian Province was conducted to study the impacts of different concentration (1, 5, 10, 50, and 100 mg · L-1) mercury ( Hg2+ ) on the seedlings leaf photosynthesis and antioxydase activities. With the increase of added Hg2+ concentration and exposure time, the seedlings leaf net photosynthetic rate ( Pn) and chlorophyll content decreased. Under the stress of high concentration Hg2+( ≥50 mg · L-1) , the decrement of Pn was higher than that under the stress of low concentration Hg2+ , and the Pn decreased rapidly after 48 h. There was a significantly negative correlation between Pn and extracellular carbon dioxide concentration ( Ci) . The chlorophyll content decreased with increasing Hg2+ concentration. The stomatal conductance ( Gs ) had different responses to the stress of different Hg2+ concentration. At low Hg2+ concentration, stomatal factors could limit the photosynthesis; while at high Hg2+ concentration, non-stomatal factors could be the main causes inhibiting photosynthesis. Low Hg2+ concentration promoted the activities of superoxide dismutase and peroxidase, while high Hg2+ concentration inhibited the activities of the two enzymes, being the lowest under the stress of 100 mg Hg2+ · L-1. All the results implied that Hg2+ could inhibit the leaf photosynthesis of A. marina, and high concentration Hg2+ impaired the active oxygen elimination capability of A. marina, making the plants easily to be damaged.%为了解红树植物的重金属抗性机制,对白骨壤(Avicennia marina)幼苗进行不同浓度Hg2+(1、5、10、50、100 mg·L-1)的胁迫实验,测定并分析了Hg2+胁迫对白骨壤幼苗叶片的光合作用和抗氧化酶活性的影响.结果表明:叶片净光合速率随着胁迫时间的延长而降低,高浓度(≥150 mg·L-1)Hg2+胁迫下叶片的净光合

  1. 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

    2012-05-01

    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.In their two-volume textbook on social-scientific gender studies, Karl Lenz and Marina Adler are guided by the established distinction between macro- and microsociology. The first volume traces theoretical perspectives on gender studies and various connections to culture. Furthermore, it also zeroes in on central topics of a social structure analysis of the gender order, namely law, politics, education, and work. The second volume focuses on socialization as well as selected findings of microsociological gender studies, namely body, sexuality, personal relationships, deviance, and violence. This overdue, informative, carefully researched, but comparatively traditional and empirically oriented introduction locates gender studies within the broader field of diversity research; however, the relationship between diversity and gender is unfortunately not reflected on.

  2. 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...... type on seedling performance were found and since there were no differences in oxygen or sulphide concentrations between the treatments, we attribute the reductions in seedling growth to algal shading. In a comparison with other studies it is shown that lower turbulence, higher temperature, organically...

  3. Excited state energy transfer between CdSe nanocrystals and the isolated phycobiliprotein antenna of A.marina

    Energy Technology Data Exchange (ETDEWEB)

    Schmitt, Franz-Josef; Jeyasangar, Vithiya; Suedmeyer, Heinrich; Schoengen, Max; Eichler, Hans Joachim [Institute of Optics and Atomic Physics, Berlin Institute of Technology (Germany); Paschenko, Vladimir [Lomonosov Moscow State University (Russian Federation); Renger, Gernot [Max-Vollmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology (Germany)

    2010-07-01

    A quantitative analysis of the interaction between semiconductor nanocrystals and isolated light harvesting complexes from photosynthetic organisms is of relevance for the development of biosensors with enhanced sensitivity. The present work describes results obtained on a hybrid system consisting of CdSe nanoparticles and rod shaped phycobiliproteine (PBP) antenna complexes from the cyanobacterium Acaryochloris marina. The CdSe core of the nanocrystals is covered with a ZnS shell and the surface is functionalised with anions of dihydrolipoic acid leading to electrostatic coupling to the PBPs. The measured time resolved and time integrated fluorescence spectra can be explained by a highly efficient excitation energy transfer from the nanocrystals to the PBP antenna with a time constant of about 200 ps at room temperature. At 0 C a decoupling of about 80 % of the CdSe crystals from the PBP antennae was observed. These results could be relevant for the design of switchable light harvesting systems or controlled fluorescence enhancement.

  4. Excited state energy transfer between CdSe nanocrystals and the isolated phycobiliprotein antenna of A.marina

    International Nuclear Information System (INIS)

    A quantitative analysis of the interaction between semiconductor nanocrystals and isolated light harvesting complexes from photosynthetic organisms is of relevance for the development of biosensors with enhanced sensitivity. The present work describes results obtained on a hybrid system consisting of CdSe nanoparticles and rod shaped phycobiliproteine (PBP) antenna complexes from the cyanobacterium Acaryochloris marina. The CdSe core of the nanocrystals is covered with a ZnS shell and the surface is functionalised with anions of dihydrolipoic acid leading to electrostatic coupling to the PBPs. The measured time resolved and time integrated fluorescence spectra can be explained by a highly efficient excitation energy transfer from the nanocrystals to the PBP antenna with a time constant of about 200 ps at room temperature. At 0 C a decoupling of about 80 % of the CdSe crystals from the PBP antennae was observed. These results could be relevant for the design of switchable light harvesting systems or controlled fluorescence enhancement.

  5. 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...

  6. Sustentabilidade, turismo e áreas protegidas: a abordagem da resiliência no contexto do Parque Natural Vale do Guadiana

    OpenAIRE

    Ribeiro, Cátia Sofia Magrito

    2012-01-01

    The Resilience thinking changes our way of understanding the Social-Ecological Systems and of assessing their sustainability because it favors a holistic vision and uncertainty is the key feature in its models. Recently a revision of this approach has been developed to analyze the sustainability of protected area tourism. This dissertation takes this conceptual framework and tries to apply it to a specific case study, the Parque Natural Vale do Guadiana‗s tourism system. In the first part of ...

  7. Patagonia, de margen exótico a periferia turística. Una mirada sobre un área natural protegida de frontera

    OpenAIRE

    Paula Gabriela Núñez; Brenda Matossian; Laila Vejsbjerg

    2012-01-01

    During the first half of the twentieth century, National Parks in Argentina were located in peripheral border spaces. This configuration responded to previous territorial organization logics developed in the country. In order to analyze the impact and influence of these Natural Protected Areas, the Nahuel Huapi National Park (Andean Patagonia, Argentina) case study was considered. It was concluded that, in the region of the Nahuel Huapi, the centralization in the national territorial administ...

  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. 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.)

  10. Evidence for strain-specific exometabolomic responses of the coccolithophore Emiliania huxleyi to grazing by the dinoflagellate Oxyrrhis marina.

    Directory of Open Access Journals (Sweden)

    Kelsey L Poulson-Ellestad

    2016-01-01

    Full Text Available The coccolithophore Emiliania huxleyi forms massive blooms and plays a critical role in global elemental cycles, sequestering significant amounts of atmospheric carbon dioxide on geological time scales via production of calcium carbonate coccoliths and emitting dimethyl sulfoniopropionate (DMSP which has the potential for increasing atmospheric albedo. Because grazing in pelagic systems is a major top-down force structuring microbial communities, the influence of grazers on E. huxleyi populations has been of interest to researchers. Roles of DMSP (and related metabolites in interactions between E. huxleyi and protist grazers have been investigated, however, little is known about the release of other metabolites that may influence, or be influenced by, such grazing interactions. We used high-resolution mass spectrometry in an untargeted approach to survey the suite of low molecular weight compounds released by four different E. huxleyi strains in response to grazing by the dinoflagellate Oxyrrhis marina. Overall, a strikingly small number of metabolites were detected from E. huxleyi and O. marina cells, but these were distinctly informative to construct metabolic footprints. At most, E. huxleyi strains shared 25% of released metabolites. Furthermore, there appeared to be no unified metabolic response in E. huxleyi strains to grazing; rather these responses were strain specific. Concentrations of several metabolites also positively correlated with grazer activities, including grazing, ingestion, and growth rates; however, no single metabolite responded uniformly across all strains of E. huxleyi tested. Regardless, grazing clearly transformed the constituents of dissolved organic matter produced by these marine microbes. This study addresses several technical challenges, and presents a platform to further study the influence of chemical cues in aquatic systems and demonstrates the impact of strain diversity and grazing on the complexity of

  11. 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

  12. 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

  13. Ageing effects on ring ties used in spacer cable systems; Desempenho de aneis de fixacao usados na rede protegida de distribuicao de energia electrica sob inteperismo natural

    Energy Technology Data Exchange (ETDEWEB)

    Munaro, Marilda

    2005-07-01

    This paper presents the performance of ring ties used in space cable systems. The aging was monitored during 3 years under normal conditions of utilization in Cuiaba city in the central area of Brazil, i.e., hot temperatures alternated with rain. The materials were evaluated by mechanical and optical tests. It was observed that the sun radiation associated with mechanical stress contribute to degradation of the elastomers: SiR and EPR. The ring ties manufactured with silicone rubber showed better behavior than those prepared from EPR. (author)

  14. Desempenho e características qualitativas da carcaça e da carne de cordeiros terminados em confinamento alimentados com dietas contendo soja grão ou gordura protegida Performance and qualitative characteristics of carcasses and meat of lambs finished in confinement and fed diets containing soybean grain or protected fat

    Directory of Open Access Journals (Sweden)

    Alexandre Rodrigo Mendes Fernandes

    2011-08-01

    Full Text Available O objetivo foi avaliar o desempenho, as características das carcaças e a qualidade da carne de cordeiros Santa Inês, terminados em confinamento, alimentados com dietas contendo 60% de concentrado e enriquecidas com soja grão ou gordura protegida. Os concentrados foram compostos de farelo de soja, milho, farelo de trigo, ureia, núcleo mineral, soja grão ou gordura protegida. Como volumoso foi utilizado o feno de capim-tifton 85. Foram utilizados 24 cordeiros com aproximadamente 19,30 ± 1,77 kg e média de idade de 5 meses alojados em baias individuais por um período de 105 dias (21 de adaptação e 84 dias de período experimental. Os animais foram pesados ao início do experimento e a intervalos de 28 dias, com a finalidade de acompanhar o ganho de peso dos animais. Findo o experimento, foram abatidos para mensurações nas carcaças e avaliação das características quantitativas. Após o resfriamento das carcaças por 24 horas, foram retiradas amostras do lombo para análises da qualidade da carne. O delineamento experimental foi o inteiramente casualizado, com três tratamentos e oito repetições. Os animais que receberam a gordura protegida apresentaram maior ganho em peso (0,24 kg/dia. As dietas contendo soja grão ou gordura protegida proporcionaram melhor conversão alimentar (4,80 e 4,06 respectivamente. O enriquecimento da dieta com soja grão ou gordura protegida não promove diferenças significativas nas características de carcaça nem na qualidade da carne.The objective of this work was to evaluate performance, carcass traits and meat quality of Santa Inês lambs, finished in feedlot, fed diets containing 60% concentrate and enriched with soybean grain or with protected fat. The concentrates were composed with soybean meal, corn, wheat meal, urea, mineral mixture, soybean grain or protected fat. Tifton-85 hay was used as roughage. It was used 24 lambs with approximately 19.30 ± 1.77 kg and at average age of five months

  15. ECO-PEDAGOGY, A WAY TO PRESERVE PROTECTED AREAS AND THE COLOMBIAN COFFEE CULTURAL LANDSCAPE / ECOPEDAGOGÍA PARA PRESERVAR LAS ÁREAS PROTEGIDAS Y EL PAISAJE CULTURAL CAFETERO

    OpenAIRE

    DIANA MAGALLY CORREA VALERO

    2014-01-01

    This article presents progress made in research regarding environmental educational theory and teaching methods as well as environmental law. Based on a specific case study, the possibility of putting into practice the concepts of eco-pedagogy, eco-citizenship and ecological societies, as well as interdisciplinarity, interculturality and knowledge dialogues, is analyzed. The methods used are social-legal research, participatory action research and the ethnogra...

  16. Rodent diversity and habitat use in a protected area of Buenos Aires province, Argentina Diversidad y uso del hábitat por roedores en un área protegida de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Isabel E. Gómez-Villafañe

    2012-09-01

    Full Text Available Habitat use of rodents is associated to environmental variables, species requirements and biological interactions. The aim of this study was to analyse the macro and microhabitat use and spatial variation in the abundance of small wild rodents that inhabit Otamendi Natural Reserve, Argentina. We studied the rodent communities in 6 habitats: riparian forest, Celtis tala forest, lowland grassland, salt marsh and 2 highland grasslands. We captured a total of 153 individual of Scapteromys aquaticus, Akodon azarae, Oxymycterus rufus, Oligoryzomys flavescens, Deltamys kempi and O. nigripes, with a trapping effort of 3636 trap-nights. The species richness is maintained by the presence of different habitats that satisfy specific requirements from specialist and generalist species, using differentially the reserve and forming communities of different specific composition in each habitat. A differential macrohabitat use was observed by all species, and a certain level of selectivity at microhabitat scale was observed in individuals of 2 species. This study shows that the diversity of environments in the Otamendi Natural Reserve, which allows the maintenance of many wild species of small rodents; confirming the high ecological and conservational value of the reserves inside an urban region.El uso del habitat de los roedores está asociado a variables ambientales, requerimientos específicos e interacciones biológicas. El objetivo de este estudio fue analizar el uso del macro y microhábitat y la variación espacial en la abundancia de pequeños roedores que habitan la Reserva Natural Otamendi, Argentina. Estudiamos la comunidad de roedores en 6 ambientes: bosque ribereño, talares, pastizales bajos, pastizal salino y 2 pastizales altos. Capturamos 153 individuos de Scapteromys aquaticus, Akodon azarae, Oxymycterus rufus, Oligoryzomys flavescens, Deltamys kempi y O. nigripes, con un esfuerzo de 3 636 trampas-noche. La riqueza de especies se mantiene mediante la presencia de diferentes hábitats que satisfacen los requerimientos específicos tanto de especies especialistas como especies generalistas, usando diferencialmente la reserva y formando comunidades de diferente composición en cada ambiente. Se observó un uso diferencial a escala del macrohábitat de todas las especies y una selectividad a escala del microhábitat en individuos de 2 especies. Este estudio muestra que la diversidad de ambientes en la reserva natural permite el mantenimiento de especies silvestres de pequeños roedores, confirmando el valor ecológico y de conservación de la reserva situada dentro de una región urbanizada.

  17. El recinto campamental romano de Santa Marina (Valdeolea, Cantabria: un posible escenario de las Guerras Cántabras. Resultados preliminares de la campaña de 2009.

    Directory of Open Access Journals (Sweden)

    Fernández Vega, Pedro Ángel

    2011-01-01

    Full Text Available Presentamos a continuación los resultados preliminares de la campaña de prospección magnética desarrollada en 2009 en el campamento romano de Santa Marina (Valdeolea, Cantabria. Una campaña que, a partir de los materiales hallados, nos acerca a un nuevo escenario de las Guerras Cántabras y a la mejor comprensión de la romanización de la comarca de Valdeolea (Cantabria.

  18. La biogeografia de las algas bentonicas marinas, tema central de la sesion de algologia del VII simposio nacional de botanica criptogamica

    OpenAIRE

    Ribera Siguán, María Antonia; Álvarez Cobelas, Miguel

    1989-01-01

    Se expone aquí brevemente el interés actual de la biogeografía de algunas algas bentónicas marinas; se mencionan las investigaciones llevadas a cabo en nuestro país y se comentan los motivos de haber elegido este tema para la Sección de Algología del VII Simposio Nacional de Botánica Criptogámica.

  19. Temporal and spatial changes of crustaceans in mixed eelgrass beds, Zostera marina L. and Z. noltii Hornem., at the Sinop peninsula coast (the southern Black Sea, Turkey)

    OpenAIRE

    KARAÇUHA, Melek ERSOY; SEZGİN, M.; DAĞLI, Ertan

    2009-01-01

    This research was carried out to determine the macrobenthic crustacean species associated with mixed eelgrass beds (Zostera marina and Z. noltii) occurring in the upper-infralittoral zone of the Sinop peninsula coast (the southern Black Sea, Turkey) and their bioecolological features. From June 2004 to April 2005, investigations were seasonally performed at the depths of 2-4 m at 6 different stations chosen on the Sinop peninsula coast. As a result of the study, a total of 7057 individuals be...

  20. Impact of polychaetes (Nereis spp. and Arenicola marina) on carbon biogeochemistry in coastal marine sediments†

    OpenAIRE

    Kristensen Erik

    2001-01-01

    Known effects of bioturbation by common polychaetes (Nereis spp. and Arenicola marina) in Northern European coastal waters on sediment carbon diagenesis is summarized and assessed. The physical impact of irrigation and reworking activity of the involved polychaete species is evaluated and related to their basic biology. Based on past and present experimental work, it is concluded that effects of bioturbation on carbon diagenesis from manipulated laboratory experiments cannot be directly extr...

  1. 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. PMID:27003238

  2. 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。

  3. 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

  4. Knowledge about breast cancer and reasons for late presentation by cancer patients seen at Princess Marina Hospital, Gaborone, Botswana

    Directory of Open Access Journals (Sweden)

    Deogratias Mbuka-Ongona

    2013-01-01

    Full Text Available Introduction: In Botswana, breast cancer, the second most common malignancy amongst women, is often diagnosed late, with 90% of patients presenting at advanced stages at Princess Marina Hospital (PMH Gaborone, the only referral hospital with an operational oncology department. The reasons for this late presentation have not been studied. Determination of these reasons is critical for the formulation of strategies to reduce morbidity and mortality from breast cancer in Botswana. The aim of this study was to explore existing knowledge about breast cancer and the reasons for late presentation amongst patients attending the oncology unit of Princess Marina Hospital.Method: A descriptive qualitative study using free attitude interview was performed.Twelve breast cancer sufferers were purposefully selected and eleven interviews conducted. Interviews were audio-taped, transcribed verbatim and translated. Thematic analysis of data was performed.Results: This study found that breast cancer sufferers had had poor knowledge of the disease prior to the diagnosis. Their knowledge improved markedly during their attendance to the oncology clinic. Screening methods such as breast self-examination (BSE were not used frequently. The majority of participants had delayed going to the hospital because of a lack of knowledge, fear of the diagnosis and fear of death, misinterpretation of the signs, the influence of lay beliefs and advice from the community. In some cases, however, advice from family and friends resulted in a timely medical consultation. The poor clinical practices of some healthworkers and the inadequate involvement by decision makers regarding the issue of cancer awareness discouraged patients from seeking and adhering to appropriate therapy.Conclusions: Awareness and knowledge of breast cancer was found to be poor amongst sufferers prior to their diagnosis, but their awareness and knowledge improved after the diagnosis. There was limited use of

  5. IMPACTS OF SALINITY AND NUTRIENT STRESS TO RUPPIA MARITIMA AND ZOSTERA MARINA: A MESOCOSM EXPERIMENT

    Science.gov (United States)

    Healthy seagrass beds were once found throughout the shallow areas of Narragansett Bay, R.I. but have disappeared due to infilling, pollution and disease. In Greenwich Bay, a highly developed embayment within Narragansett Bay, Ruppia maritima has colonized an area on the norther...

  6. ASSESSING THE IMPACTS OF SALINITY AND NUTRIENT STRESS TO RUPPIA MARITIMA AND ZOSTERA MARINA

    Science.gov (United States)

    Healthy seagrass beds were once found throughout the shallow areas of Narragansett Bay, R.I. but have disappeared due to infilling, pollution and disease. In Greenwich Bay, a highly developed embayment within Narragansett Bay, Ruppia maritima has colonized an area on the norther...

  7. An experimental transplantation to select the optimal site for restoration of the eelgrass Zostera marina in the Taehwa River estuary

    Science.gov (United States)

    Park, Jung-Im; Kim, Jeong Bae; Lee, Kun-Seop; Son, Min Ho

    2013-12-01

    To select the optimal site for the restoration of seagrass habitats in the Taehwa River estuary, we transplanted the eelgrass Zostera marina to three potential candidate sites in March 2007 and monitored the transplanted seagrass and associated environmental factors for six months. In all three sites, the transplanted seagrasses exhibited no initial morphological loss due to transplanting stress. The transplanted seagrass communities at sites 2 and 3 showed more than a 180% increase in density over the entire survey period. In contrast, despite a density increase in the first month after transplantation, most of the transplanted seagrasses at site 1 died. This may be due to the large decrease in underwater irradiance reaching the seagrass leaves at site 1 for two months during June and July, which fell below the level of compensation irradiance. The growth rate and size of the seagrass shoots were also larger at sites 2 and 3 compared with site 1. This is probably due to higher nutrient concentrations in the sediment pore water at sites 2 and 3 compared with site 1, although water depth, salinity, and the nutrient concentrations in the water columns from the three sites were similar. Therefore, for the restoration of seagrass habitats in the Taehwa River estuary, sites 2 and 3 were preferable to site 1 as transplantation sites.

  8. 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.

  9. Temperature-induced variations of blood acid-base status in the lugworm, Arenicola marina (L.): II. In vivo study.

    Science.gov (United States)

    Toulmond, A

    1977-11-01

    Lugworms, Arenicola marina (L.), acclimatized at 16-17 degrees C, were acclimated at temperatures between 5.3 and 25.7 degrees C for 96 h. Whereas in vitro Arenicola blood behaves like a Rosenthal system, in vivo prebranchial blood does not: the higher the acclimation temperature, the lower the pHv and [HCO3]V, PVCO2, remaining practically constant. Nevertheless, the very low relative alkalinity of the blood in vivo ([OH-]/[H+] is less than 3), and the degree of dissociation of extra- and intracellular proteins, remain practically constant whatever the temperature. From examples in the literature together with these results, it is concluded that poikilothermic air-breathers and poikilothermic water-breathers regulate their blood pH in the face of temperature changes by contrasting mechanisms. In the first, regulation is almost instantaneous and takes place at the pulmonary level through adjustment of CO2 exchanges. In the second this regulation is slow and mainly extraventilatory, occurring through ionic exchanges. This contrast must be considered in relation with differences in blood PCO2 values, caused by the much higher O2 capacitance of air compared to water. PMID:928994

  10. Temperature-induced variations of blood acid-base status in the lugworm, Arenicola marina (L.): I. In vitro study.

    Science.gov (United States)

    Toulmond, A

    1977-11-01

    Blood of the lugworm Arenicola marina studied in vitro behaved like a Rosenthal system: when temperature rose, pH decreased and PCO2 increased, whereas [HCO3] remained practically constant. pH values were low whatever the CCO2 and SO2. The temperature coefficient dpH/dt was always significantly different from the mean temperature-induced variations of the neutral pH of pure water between 0 and 30 degrees C. Consequently, the relative alkalinity of the blood, [OH-]/[H+], was very low (range, 1.53-5.06) and increased appreciably with temperature. Calculated changes in the fractional dissociation of protein imidazole groups, alphaIm, were smaller. The very variable buffer power of Arenicola hemoglobin was maximum (beta max) for a strictly defined, temperature-dependent value of pH (pH beta max), suggesting that as yet unidentified ionizable group on the hemoglobin molecule, RH, could be responsible for the pH-dependent changes of blood buffer power in Arenicola. Assuming pK'RH = PH beta max, the calculated fractional dissociation of RH, alpha RH, was constant between 0 and 30 degrees C. The nature of RH is discussed in relation with Reeves's hypothesis concerning the preeminence of protein imidazole groups in the regulation of extra- and intracellular pH. PMID:928993

  11. 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. PMID:25033036

  12. Living up to its name? The effect of salinity on development, growth, and phenotype of the "marine" toad (Rhinella marina).

    Science.gov (United States)

    Wijethunga, Uditha; Greenlees, Matthew; Shine, Richard

    2016-02-01

    The highly permeable integument of amphibians renders them vulnerable to chemical characteristics of their environment, especially during the aquatic larval stage. As the cane toad (Rhinella marina, Bufonidae) invades southwards along the east coast of Australia, it is encountering waterbodies with highly variable conditions of temperature, pH, and salinity. Understanding the tolerance of toads to these conditions can clarify the likely further spread of the invader, as well as the adaptability of the species to novel environmental challenges. We measured salinity in waterbodies in the field and conducted laboratory trials to investigate the impacts of salinity on toad viability. Eggs and tadpoles from the southern invasion front tolerated the most saline conditions we found in potential spawning ponds during surveys [equivalent to 1200 ppm (3.5 % the salinity of seawater)]. Indeed, high-salinity treatments increased tadpole body sizes, accelerated metamorphosis, and improved locomotor ability of metamorphs (but did not affect metamorph morphology). At very low salinity [40 ppm (0.1 % seawater)], eggs hatched but larvae did not develop past Gosner stage 37. Our study shows that the egg and larval life stages of cane toads can tolerate wide variation in the salinity of natal ponds and that this aspect of waterbody chemistry is likely to facilitate rather than constrain continued southward expansion of the toad invasion front in eastern Australia. PMID:26553545

  13. Utilização de gordura protegida durante o terço inicial da lactação de vacas leiteiras em pastagem de coast-cross Use of rumen bypass fat for early-lactating dairy cows grazing on coast-cross pasture

    OpenAIRE

    Duarte Vilela; Maurilio José Alvim; Leovegildo Lopes de Matos; João Batista Matiolli

    2002-01-01

    O experimento foi realizado com o objetivo de avaliar o aumento na densidade energética de um concentrado quando se usa uma fonte comercial de gordura protegida, fornecida para vacas da raça Holandesa em pastagem de coast-cross-1 (Cynodon dactylon (L.) Pers.), durante o terço inicial da lactação. Foram utilizadas 14 vacas, todas no início da lactação e recebendo 9, 6 e 3 kg/vaca/dia de concentrado (23,5% de proteína bruta e 80% de NDT), no terço inicial (até 90 dias), médio (91 a 180 dias) e ...

  14. Measuring biological responses at different levels of organisation to assess the effects of diffuse contamination derived from harbour and industrial activities in estuarine areas.

    Science.gov (United States)

    de los Ríos, A; Pérez, L; Echavarri-Erasun, B; Serrano, T; Barbero, M C; Ortiz-Zarragoitia, M; Orbea, A; Juanes, J A; Cajaraville, M P

    2016-02-15

    To evaluate the effects of diffuse contamination, biological measurements were applied in a scrap cargo harbour, a marina and an industrial area. Metal accumulation and biomarkers (survival in air, digestive gland and gonad histopathology, lysosomal membrane stability, intralysosomal metal accumulation, transcription of vitellogenin and MT20, peroxisome proliferation and micronuclei formation) were measured in transplanted mussels, together with metrics of benthic invertebrates. Benthic species were classified into ecological groups and univariate indexes were calculated. The marina showed high richness (16) and percentage of opportunistic species (55.1%) and low metal accumulation. Mussels in the scrap cargo harbour showed high metal accumulation, up-regulation of MT20 transcription, reduced health status (LP<6 min) and increased micronuclei frequencies (up to 11.3‰). At the industrial area, low species richness (4) and badly organised assemblages were detected and chemical analyses indicated significant amounts of bioavailable metals. Overall, selected biological measurements showed potential for the assessment of diffuse contamination. PMID:26707886

  15. Efeito da gordura protegida sobre a produção e composição do leite em ovelhas da raça Bergamácia Effect of bypass fat on milk production and composition in Bergamasca ewes

    Directory of Open Access Journals (Sweden)

    Monalissa de Melo Stradiotto

    2010-05-01

    Full Text Available Objetivou-se avaliar o efeito da gordura protegida sobre a produção e composição do leite em ovelhas da raça Bergamácia. Utilizaram-se 77 ovelhas distribuídas, por ordem de parição e idade, em duas dietas: uma composta de silagem de milho e concentrado; e outra com gordura protegida (35 g/ovelha/dia no concentrado. As dietas foram isoenergéticas e isoproteicas e continham 70% NDT e 16% PB com base na matéria seca. Os cordeiros permaneceram com suas mães até os 45 dias de idade, quando foram desmamados. Quarenta e oito horas após o parto, deu-se início a ordenha realizada uma vez ao dia, às 7 h, para mensuração diária da produção de leite durante 60 dias. Amostras de leite foram coletadas semanalmente para análise da composição centesimal e do teor de caseína. A dieta com gordura protegida promoveu maior produção média diária de leite após a desmama (0,531 vs 0,489 kg/dia, entretanto, a produção total do período não diferiu entre controle e com gordura protegida (0,453 vs 0,468 kg/dia, respectivamente. Não foi observada influência das dietas sobre os teores de gordura do leite até a sexta semana de lactação. As diferenças ocorreram apenas após a desmama. Os teores de alfa e beta caseínas diferiram entre os grupos controle e gordura protegida (31,73 vs 18,56 Kda para alfa-caseína e 32,67 vs 26,44 Kda para beta-caseína, respectivamente. A adição de gordura protegida na dieta não altera a produção nem a composição centesimal do leite até a desmama.The aim of this work was to evaluate the effect of bypass fat on milk production and composition in Bergamasca ewes. It was used 77 ewes which were distributed by parity and age orders in two groups: control diet (C: corn silage and concentrate; and bypass fat diet (GP: corn silage + concentrated + bypass fat (35 g/ewe/day added in the concentrate. Diets were isoenergetic and isonitrogenous with 70% of total digestible nutrients and 16% of crude protein

  16. Monitoring and analysis of semi-volatile organic compounds in ambient air / by Marina Nkhalong Ketsise

    OpenAIRE

    Ketsise, Marina Nkhalong

    2006-01-01

    The growing concern for environmental pollution indicates the importance of correctly predicting the fate of pollutants in ambient air. This study was conducted to predict the ambient levels of polycyclic aromatic hydrocarbons (PAH's) in the greater Sasolburg area and to better understand the distribution and the sources of PAH's in ambient air. PAH's are chemical compounds which consist of two or more fused benzene rings and made entirely from carbon and hydrogen. PAH's are...

  17. 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. PMID:27125819

  18. 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.

  19. Molecular cloning of class III chitinase gene from Avicennia marina and its expression analysis in response to cadmium and lead stress.

    Science.gov (United States)

    Wang, Li-Ying; Wang, You-Shao; Zhang, Jing-Ping; Gu, Ji-Dong

    2015-10-01

    Mangrove species have high tolerance to heavy metal pollution. Chitinases have been widely reported as defense proteins in response to heavy metal stress in terrestrial plants. In this study, a full-length cDNA sequence encoding an acidic and basic class III chitinase (AmCHI III) was cloned by using RT-PCR and RACE methods in Avicennia marina. AmCHI III mRNA expression in leaf of A. marina were investigated under Cd, Pb stresses on using real-time quantitative PCR. The deduced AmCHI III protein consists of 302 amino acids, including a signal putative peptide region, and a catalytic domain. Homology modeling of the catalytic domain revealed a typical molecular structure of class III plant chitinases. Results further demonstrated that the regulation of AmCHI III mRNA expression in leaves was strongly dependent on Cd, Pb stresses. AmCHI III mRNA expressions were significantly increased in response to Cd, Pb, and peaked at 7 days Cd-exposure, 7 days Pb-exposure, respectively. AmCHI III mRNA expression exhibited more sensitive to Pb stress than Cd stress. This work was the first time cloing chitinase from A. marina, and it brought evidence on chitinase gene involving in heavy metals (Cd(2+) and Pb(2+)) resistance or detoxification in plants. Further studies including the promoter and upstream regulation, gene over-expression and the response of mangrove chitinases to other stresses will shed more light on the role of chitinase in mangrove plants. PMID:26044930

  20. The thermodynamics and kinetics of electron transfer between cytochrome b6f and photosystem I in the chlorophyll d-dominated cyanobacterium, Acaryochloris marina.

    Science.gov (United States)

    Bailleul, Benjamin; Johnson, Xenie; Finazzi, Giovanni; Barber, James; Rappaport, Fabrice; Telfer, Alison

    2008-09-12

    We have investigated the photosynthetic properties of Acaryochloris marina, a cyanobacterium distinguished by having a high level of chlorophyll d, which has its absorption bands shifted to the red when compared with chlorophyll a. Despite this unusual pigment content, the overall rate and thermodynamics of the photosynthetic electron flow are similar to those of chlorophyll a-containing species. The midpoint potential of both cytochrome f and the primary electron donor of photosystem I (P(740)) were found to be unchanged with respect to those prevailing in organisms having chlorophyll a, being 345 and 425 mV, respectively. Thus, contrary to previous reports (Hu, Q., Miyashita, H., Iwasaki, I. I., Kurano, N., Miyachi, S., Iwaki, M., and Itoh, S. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 13319-13323), the midpoint potential of the electron donor P(740) has not been tuned to compensate for the decrease in excitonic energy in A. marina and to maintain the reducing power of photosystem I. We argue that this is a weaker constraint on the engineering of the oxygenic photosynthetic electron transfer chain than preserving the driving force for plastoquinol oxidation by P(740), via the cytochrome b(6)f complex. We further show that there is no restriction in the diffusion of the soluble electron carrier between cytochrome b(6)f and photosystem I in A. marina, at variance with plants. This difference probably reflects the simplified ultrastructure of the thylakoids of this organism, where no segregation into grana and stroma lamellae is observed. Nevertheless, chlorophyll fluorescence measurements suggest that there is energy transfer between adjacent photosystem II complexes but not from photosystem II to photosystem I, indicating spatial separation between the two photosystems. PMID:18635535

  1. 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.

  2. Indirect effects of predators control herbivore richness and abundance in a benthic eelgrass (Zostera marina) mesograzer community.

    Science.gov (United States)

    Amundrud, Sarah L; Srivastava, Diane S; O'Connor, Mary I

    2015-07-01

    Herbivore communities can be sensitive to changes in predator pressure (top-down effects) and resource availability (bottom-up effects) in a wide range of systems. However, it remains unclear whether such top-down and bottom-up effects reflect direct impacts of predators and/or resources on herbivores, or are indirect, reflecting altered interactions among herbivore species. We quantified direct and indirect effects of bottom-up and top-down processes on an eelgrass (Zostera marina) herbivore assemblage. In a field experiment, we factorially manipulated water column nutrients (with Osmocote(™) slow-release fertilizer) and predation pressure (with predator exclusion cages) and measured the effects on herbivore abundance, richness and beta diversity. We examined likely mechanisms of community responses by statistically exploring the response of individual herbivore species to trophic manipulations. Predators increased herbivore richness and total abundance, in both cases through indirect shifts in community composition. Increases in richness occurred through predator suppression of common gammarid amphipod species (Monocorophium acherusicum and Photis brevipes), permitting the inclusion of rarer gammarid species (Aoroides columbiae and Pontogeneia rostrata). Increased total herbivore abundance reflected increased abundance of a caprellid amphipod species (Caprella sp.), concurrent with declines in the abundance of other common species. Furthermore, predators decreased beta diversity by decreasing variability in Caprella sp. abundance among habitat patches. Osmocote(™) fertilization increased nutrient concentrations locally, but nutrients dissipated to background levels within 3 m of the fertilizer. Nutrient addition weakly affected the herbivore assemblage, not affecting richness and increasing total abundance by increasing one herbivore species (Caprella sp.). Nutrient addition did not affect beta diversity. We demonstrated that assemblage-level effects of

  3. 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.

  4. 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.

  5. 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.

  6. 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. PMID:26549842

  7. Bioaccumulation of arsenic from water and sediment by a deposit-feeding polychaete (Arenicola marina): A biodynamic modelling approach

    International Nuclear Information System (INIS)

    Arsenic bioaccumulation in the deposit-feeding polychaete Arenicola marina has been investigated using biodynamic modelling. Radiotracer techniques were used to determine the rates of uptake of As as arsenate from water and sediment and its subsequent efflux in the laboratory. Lugworms accumulated As from solution linearly at concentrations of 2-20 μg l-1, with a corresponding uptake rate constant of 0.1648 ± 0.0135 l g-1 d-1. 7.8 ± 0.8% (assimilation efficiency) of the As ingested bound to sediments was retained after egestion of unassimilated metal. Elimination of As followed a two-compartment model, with mean efflux rate constants (from the slow pool) very similar for As accumulated from solution and ingested sediments (0.0449 ± 0.0034 and 0.0478 ± 0.0225 d-1, respectively) and a corresponding biological half-time of roughly 15 d. A biodynamic model was constructed and validated through the comparison of biodynamic model predictions against measured bioaccumulated concentrations in lugworms from five UK estuaries. The model accurately predicted bioaccumulated As concentrations in lugworms using mean values of relevant physiological parameters (uptake rate, efflux rate and growth rate constants), a site-specific ingestion rate (calculated according to mean worm size and sediment organic matter content and expressed as the rate of ingestion of the mass of fine sediment), a site-specific sediment concentration measured after HCl extraction, and a standard dissolved As concentration. This combination of parameters showed that sediment ingestion contributed 30-60% of the total As accumulated by lugworms at the studied sites, depending on the different geochemistry at each site. This study showed that it is difficult to predict accurately As bioaccumulation at sites with different chemistries, unless that chemistry is taken into account.

  8. 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.

  9. 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. PMID:25239814

  10. 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...

  11. Evaluación nutricional y propiedades biológicas de algas marinas comestibles. Estudios "in vitro" e "in vivo"

    OpenAIRE

    Gómez Ordóñez, Eva

    2012-01-01

    El objetivo principal de esta tesis doctoral es la caracterización y evaluación in vitro e in vivo de la calidad nutricional de algas marinas españolas como fuente de compuestos biológicamente activos, principalmente polisacáridos sulfatados. Se ha analizado la composición química de las algas pardas y rojas de partida y especialmente la fibra alimentaria. Además mediante una extracción química secuencial se han obtenido fracciones solubles de los principales polisacáridos de la pared celular...

  12. Evaluaciones toxicol??gicas de un extracto acuoso del alga marina Bryothamnion triquetrum (Gmelin) M.A.Howe en estudios in vitro y modelos animales

    OpenAIRE

    A Vidal-Novoa; Fallarero-Linares, A.; Laba??ino, M.; S??nchez-Lamar, A.; Batista-Gonz??lez, A.E.; Silva, Amo; Mancini-Filho, J.

    2012-01-01

    Objetivo: El objetivo de este trabajo fue evaluar la toxicidad de un extracto acuoso del alga marina Bryothamnion triquetrum. M??todos: El ensayo de Ames se desarroll?? con las cepas de S. typhimurium TA 1535, TA 1537 y TA 1538 con y sin activaci??n metab??lica. El estudio de citotoxicidad se realiz?? con c??lulas intestinales Caco-2 durante 24 y 48 horas de exposici??n al extracto y la viabilidad fue evaluada con la t??cnica de yoduro de propidio. El Estudio de Toxicidad Aguda se realiz??...

  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; 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 ...

  14. 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.

  15. Avicequinone C Isolated from Avicennia marina Exhibits 5α-Reductase-Type 1 Inhibitory Activity Using an Androgenic Alopecia Relevant Cell-Based Assay System

    OpenAIRE

    Ruchy Jain; Orawan Monthakantirat; Parkpoom Tengamnuay; Wanchai De-Eknamkul

    2014-01-01

    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 ha...

  16. 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

  17. Maaleht soovitab : Superstaarid esinevad Taskus. Monkist "Saaremaa valsini". Muusikapidu pärimusmuusika keskuses. Suvelõpupidu Marina külas. Hortus Musicus esineb Väravatornis

    Index Scriptorium Estoniae

    2008-01-01

    18. sept. esinevad Tartus Tasku moe- ja vaba aja keskuses telekonkursil Eesti otsib Superstaari osalenud Jana Kask ja Arno Suislep ning saate "Kaks takti ette" võitja Margus Vaher. 18. sept. toimub Tallinna Kunstihoones kitarristide Tiit Pauluse ja Jaak Sooääre uue CD esitluskontsert. 19. sept. toimub Viljandi pärimusmuusika keskuses maailmamuusika-pidu. Suvelõpupeol 20. sept. Saarde vallas Grossi järve ääres Marina külas esinevad Virve Köster ja Audru Jõelaevanduse Punt. 20. sept. Tallinnas Väravatornis esineb vanamuusikaansambel Hortus Musicus

  18. Simulación de la hidrodinámica marina en la región de Cartagena con aplicaciones al transporte de sedimentos

    OpenAIRE

    Uribe Suárez, Diego Alejandro

    2015-01-01

    Se realizaron simulaciones numéricas de la dinámica marina en la región de Cartagena entre los sectores conocidos como Galerazamba (Norte) y Bocachica (Sur) aplicadas al estudio del transporte de sedimentos -- El fenómeno de la erosión costera afecta negativamente el desarrollo de esta región tanto a nivel económico como social, debido a problemáticas relacionadas con la pérdida de tierras de importante utilidad para actividades de turismo y habitación humana, así como el deterioro de diferen...

  19. ENRIQUECIMIENTO AMBIENTAL DE NUTRIA MARINA Lontra felina (MOLINA 1782) EN EL PARQUE ZOOLÓGICO HUACHIPA ENTRE FEBRERO Y MARZO DEL 2007

    OpenAIRE

    Elisa Diana Ruiz Ramos; Edward Iván Díaz Carrillo

    2008-01-01

    El enriquecimiento ambiental es una herramienta empleada para mejorar situaciones de aburrimiento, estrés y así evitar enfermedades causadas por la inactividad de la vida en cautiverio en la fauna silvestre. El presente trabajo se desarrolló con 2 individuos de nutria marina Lontra felina (Molina 1782) en cautiverio, durante cinco semanas: en la primera semana se realizó la determinación de los patrones de comportamiento mediante un muestreo Ad libitum, y durante las cuatro semanas restantes ...

  20. Study of protective effect of Avicennia marina hydroethanolic leaf extract on testes tissue and spermatogenesis in male rat induced with carbon tetrachloride

    OpenAIRE

    Soleimani, Z.; N Mirazi

    2015-01-01

    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,...

  1. Estudio de las diferentes alternatives en materia de recuperación de energia para una Estación Desaladora de Agua Marina

    OpenAIRE

    Bonet de Tena, Albert

    2011-01-01

    La desalación de agua de mar tiene por objeto producir agua apta para cualquier uso a partir de agua marina. El agua de mar se caracteriza por su elevado contenido de sales en disolución, las cuales deben ser eliminadas en su práctica totalidad. Según las leyes físicas que rigen el comportamiento de las disoluciones, esta separación requiere una considerable aplicación de energía. El presente proyecto pretende sintetizar las bases físicas del consumo energético en la desalac...

  2. Procesos, SI y organización de la Unidad de Tecnología Marina para la mejora de la calidad del servicio

    OpenAIRE

    Zahínos Ruiz, Abel

    2009-01-01

    El presente proyecto propone la implantación de un conjunto de procesos que, junto con una reorganización del personal y la implantación de nuevos sistemas de información (SI), deben facilitar a la Unidad de Tecnología Marina (UTM) alcanzar sus objetivos. La UTM es una organización pública cuyo objetivo general es proporcionar apoyo técnico, tecnológico y logístico a las investigaciones científicas que se desarrollan en el ámbito marino y polar. El objetivo principal del proyec...

  3. Mortandad de aves marinas durante "El Niño 1997-98" en el litoral sur de San Juan de Marcona, Ica -Perú

    OpenAIRE

    Manuel Apaza; Aída Figari

    2014-01-01

    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 ...

  4. Uso de indicadores de Presión-Estado-Respuesta en el diagnóstico de la comarca de la Marina Baixa, SE, España

    OpenAIRE

    E. Chirino; Abad, J.; Bellot, J.

    2008-01-01

    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 objetiv...

  5. Oksidativna stabilnost mesa i mesnih proizvod nakon hranjenja tovnih pilića dodatnim količinama vitamina A i ružmarina

    OpenAIRE

    Marcinčák, Slavomír; Popelka, Peter; Bystrický, Pavel; Hussein, Khaled; Hudecová, Katarína

    2005-01-01

    Oksidacija lipida je glavni uzrok smanjenja kvalitete mesa i značajan čimbenik održivosti mesa i mesnih proizvoda. Antioksidanti su prirodne ili sintetske supstancije koje se koriste za sprečavanje oksidacije lipida. Dodavanjem antioksidanata u krmne smjese moguće je osigurati oksidativnu stabilnost masti mesa tijekom klaoničke obrade i kasnijeg skladištenja mesa. Cilj našeg projekta je bio ispitati zaštitni učinak prirodnih antioksidanata ružmarina (500 mg.kg-1) i vitamina E (40 mg/pilić/dne...

  6. Estudio de las macroalgas marinas del puerto de Salina Cruz, Oaxaca: redescubrimiento de Predaea subpeltata y nuevo registro de Cryptonemia angustata para el golfo...

    OpenAIRE

    Jorge Galindo Villegas; José A. Gamboa; Kurt M. Dreckmann

    1997-01-01

    Veintiocho especies de macroalgas marinas fueron identificadas viviendo en el rompeolas del puerto de Salina Cruz en el Golfo de Tehuantepec, Pacífico tropical mexicano. Se discute la identidad de Predaea subpeltata E. Y. Dawson (Gymnophoeaceae, Rhodophyta), especie que no había sido colectada desde su descripción original para el Puerto de Huatulco, Oaxaca hace 25 años. Asimismo, una colección de algas cistocárpicas asignadas a Cryptonemia angustata (Setchell Gardner) E.Y. Dawson (Halymeni...

  7. Depredación de aves marinas nocturnas en islotes de isla Guadalupe, México Predation of nocturnal seabirds on islets of Isla Guadalupe, Mexico

    OpenAIRE

    Eric Mellink

    2010-01-01

    A principios de junio de 2000, se realizó una prospección biológica de 3 islotes en el extremo sur de isla Guadalupe: islote de Afuera (o islote Zapato), islote de Adentro (o islote Toro) e islote Negro, para documentar aves marinas anidantes. Se detectaron despojos de más de 100 paíños de Leach (Oceanodroma leucorhoa), 31 mérgulos de Xantus (Synthliboramphus hypoleuca) y un alcuela de Cassin (Ptychoramphus aleuticus) depredados. Las evidencias indican como el depredador de los paíños al teco...

  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. Aves marinas observadas entre Punta Arenas (Chile) y las Islas Shetland del Sur (Antartida) en los veranos de 90/91 y 91/92

    OpenAIRE

    Haase, B.

    1993-01-01

    Durante la Tercera y Cuarta Expediciones Ecuatorianas a la Antártida, se ha observado sistemáticamente las aves marinas durante más de 103 horas. Se presenta los resultados de tres diferentes zonas recorridas: Desde Punta Arenas (Chile) hasta el Cabo de Hornos, el Paso Drake y las visitadas Islas Shetland del sur. Además de especies cuya presencia en el área se conoce, se notó con frecuencia, tanto en 1991 como en 1992, una o dos especies de petreles oscuros, presumiblemente el Petrel de Park...

  10. Uso de indicadores de Presión-Estado-Respuesta en el diagnóstico de la comarca de la Marina Baixa, SE, España

    OpenAIRE

    Chirino Miranda, Esteban; Abad Chaves, José; Bellot Abad, Juan Francisco

    2008-01-01

    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 co...

  11. Primer Resultado del Proyecto Territorial Educación Popular Ambiental para la mejora del manejo de los Desechos Sólidos en La Marina

    OpenAIRE

    Roberto A. González Castellanos; Lilian D. Curiel Lorenzo; Idalmis Izquierdo; Magalys Menéndez Peñate; Ma. Teresa Oviedo Pérez; Samuel Rodríguez Cabrera; Taimí Sánchez Sallo

    2010-01-01

    Se presentan los primeros resultados del Proyecto Territorial "Educación Popular Ambiental para la mejora del manejo de los Desechos Sólidos en , dirigido a demostrar en el barrio de La Marina la solución, aplicable para toda la ciudad, para el manejo de los RSM y las posibilidades de mejorar la situación presente a través de un cambio en las conductas de los afectados y de su participación activa y protagonismo en la solución de dicho problema...

  12. Caracterización de la temperatura superficial del mar en los sitios de visita turística de la Reserva Marina de Galápagos

    OpenAIRE

    Ortega, J.; Jara, V.; Alvarez, M.; Rentería, W.

    2012-01-01

    El presente estudio consiste en un análisis descriptivo de los parámetros físicos (temperatura-salinidad) y corrientes superficiales y sub-superficiales, obtenidos en los sitios de visita turística de la Reserva Marina de Galápagos (RMG), los cuales describen las condiciones oceanográficas de dichos lugares. Estos datos han sido procesados con el propósito de establecer una caracterización de la temperatura superficial del mar en estos sitios, y sus variaciones a lo largo del 2011. Esta carac...

  13. Uptake of curium (244Cm) by five benthic marine species (Arenicola marina, Cerastoderma edule, Corophium volutator, Nereis diversicolor and Scrobicularia plana): comparison with americium and plutonium

    International Nuclear Information System (INIS)

    Curium (244Cm) uptake from contaminated sea water was studied in five benthic marine species: two bivalve molluscs (Scrobicularia plana and Cerastoderma edule), two polychaete annelids (Arenicola marina and Nereis diversicolor) and one amphidpod crustacean (Corophium volutator). The concentrations in the whole organisms relative to the concentration in the sea water (concentration factors) were: 700 for the amphipods (after 11 d of accumulation), 140 for the cockles (after 28 d), 80 for the scrobicularia (after 23d) and approx. 30 for the two annelids (after > 20 d). All species except S. plana accumulated americium and curium similarly; S. plana accumulated similar amounts of curium and plutonium. (author)

  14. Uptake of curium (/sup 244/Cm) by five benthic marine species (Arenicola marina, Cerastoderma edule, Corophium volutator, Nereis diversicolor and Scrobicularia plana): comparison with americium and plutonium

    Energy Technology Data Exchange (ETDEWEB)

    Miramand, P.; Germain, P.; Arzur, J.C.

    1987-01-01

    Curium (/sup 244/Cm) uptake from contaminated sea water was studied in five benthic marine species: two bivalve molluscs (Scrobicularia plana and Cerastoderma edule), two polychaete annelids (Arenicola marina and Nereis diversicolor) and one amphidpod crustacean (Corophium volutator). The concentrations in the whole organisms relative to the concentration in the sea water (concentration factors) were: 700 for the amphipods (after 11 d of accumulation), 140 for the cockles (after 28 d), 80 for the scrobicularia (after 23d) and approx. 30 for the two annelids (after > 20 d). All species except S. plana accumulated americium and curium similarly; S. plana accumulated similar amounts of curium and plutonium.

  15. Allometric equations for estimating standing biomass of Avicennia marina in Bushehr of Iran

    Directory of Open Access Journals (Sweden)

    Akbar Ghasemi

    2016-07-01

    Full Text Available Today, it is important to use of ecological indicators, such as biomass for recognizing the special status of ecosystems, such as mangrove forests and also monitoring and evaluating changes through a specific period. Because using the direct method of evaluating biomass would be destructive, it is common in all similar area to use determine exact Allometric equations by using the statistical relationship between the structural characteristics of trees and their biomass and use these equations to estimate the biomass of trees. The aim of this study is estimate the aboveground biomass of mangroves and determine Allometric models for Nayband area in Bushehr, located in southern Iran. A number of mangrove trees were randomly selected. Collar diameter, crown diameter and tree height of standing trees were measured. After logging and weighing fresh weight, dry weight, trunk and branches were obtained in laboratory and biomass of components was calculated. The relationship between quantities feature of trees and biomass for determination of allometric equation was studied by using linear, power and exponential regression. The equations were compared with each other based on the different modeling parameters. The highest significant correlation was found between crown diameters and dry weight (R > 0.90. The best equations were obtained by means of an exponential and power regression models (R2adj> 0.90. The models were obtained from explained factor, suggests that there might be a relationship between the characteristics of mangrove trees and biomass.

  16. 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

    ) suggesting that variability in algal cover may go by undetected in monthly assessments. The changes in cover were caused either by algal growth or by physical forces moving large aggregations of algae into or out of the study area. Within plots (1 m2) variability was even higher and algal cover changed...... regularly between observations (days). Hence, the algae were continuously rearranged within the eelgrass beds; also during periods with no change in average algal cover. The variability in cover of individual plots was negatively correlated to eelgrass cover, suggesting that algae were retained by the...... eelgrass leaves. This highly dynamic nature of filamentous macroalgal aggregations in eelgrass beds should be considered when evaluating implications of macroalgal blooms for seagrass growth and survival. A frequent relocation of drift-algae at small spatial scale may moderate the formation of poor oxygen...

  17. Remediation of a petroleum spill using pure oxygen : Colter Bay Village marina, Teton National Park, WY

    International Nuclear Information System (INIS)

    This presentation described a remediation pilot program conducted using a pure oxygen technology called iSOC at a petroleum spill site in Teton National Park in Wyoming. The spill-site was comprised of glacial till with gravel, sand, silt and cobbles. The water table was between 11 and 30 feet below ground surface. Gasoline had been released from 2 underground storage tanks (USTs) and a product line. Moderate petroleum contamination was observed in the surrounding soils. The petroleum contamination plume was 250 feet down-gradient of the UST Basin, and had a maximum width of 110 feet. The iSOC technology was selected as it required no electrical power supply, and had no noise impacts on visitors to the park. The technology used 700 hollow fibers filled with holes to provide a large surface area for mass transfer, which occurred when gas pressure was less than groundwater pressure. The process caused high dissolved oxygen (DO) levels to migrate to the surrounding biomass, which in turn increased the microbial populations responsible for degrading the hydrocarbons. Atmospheric pressure was used to determine DO levels. The iSOC apparatus was installed at a gradient higher than the contaminated area, but within the hydrocarbon plume. A screen injection well was then placed in the target zone, and a natural convection current was used to distribute the oxygen in the well and in the surrounding groundwater. A typical iSOC well schematic was provided, as well as maps of the contamination site. Well monitor results were also provided. The site was completely remediated in 1.5 years using the technology. tabs., figs

  18. Grãos de girassol ou gordura protegida em dietas com alto concentrado e ganho compensatório de cordeiros em confinamento Sunflower grains or protected fat in high concentrate diets and compensatory gain for feedlot lambs

    Directory of Open Access Journals (Sweden)

    Antonio Carlos Homem Junior

    2010-03-01

    Full Text Available Avaliaram-se os efeitos de três dietas e dois regimes alimentares sobre o desempenho e as características de carcaça de cordeiros em confinamento. Trinta e seis cordeiros com peso inicial de 18,7 ± 2,4 kg foram distribuídos em delineamento inteiramente casualizado em esquema fatorial 3 × 2 e receberam dietas sem inclusão de lipídio e com inclusão de grãos de girassol ou gordura protegida. Seis cordeiros de cada dieta foram submetidos a restrição alimentar e posterior ganho compensatório, enquanto a outra metade foi alimentada à vontade por todo o período de confinamento. Foram avaliados o consumo de matéria seca, o ganho de peso e a conversão alimentar, os níveis de ureia e colesterol sanguíneos, as características de carcaça e os subprodutos do abate. No período de realimentação, o consumo dos cordeiros que passaram por restrição alimentar não diferiu do consumo dos animais alimentados sempre à vontade. Também não foi afetado pela dieta, no entanto, ao final desse período, o consumo acumulado foi 11,8% menor que nos animais submetidos previamente à restrição. O consumo até o peso de abate não foi alterado pelo regime alimentar. No período de restrição, o nível de colesterol sanguíneo nos cordeiros em restrição alimentar foi 24% superior ao daqueles sem restrição, mas, durante o período de realimentação, não houve diferença. A composição lipídica da dieta aumentou o colesterol sanguíneo em ambos os períodos, de restrição e de realimentação, e reduziu a ureia durante o período de realimentação. O desempenho avaliado ao peso de abate foi prejudicado pela restrição alimentar. Não houve efeito de regime alimentar ou da dieta sobre os parâmetros de carcaça. Fontes de lipídios elevaram a proporção de gorduras totais e reduziram o conteúdo do trato gastrintestinal. O regime alimentar com restrição prejudica o ganho e a conversão alimentar de cordeiros até o abate.The effects of

  19. 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.

  20. 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. PMID:23179723

  1. 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.

  2. 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.

  3. 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. PMID:18093145

  4. 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.

  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. MARINE LIFE OF URUGUAY: CRITICAL UPDATE AND PRIORITIES FOR FUTURE RESEARCH LA VIDA MARINA DE URUGUAY: REVISION CRITICA Y PRIORIDADES PARA INVESTIGACIONES FUTURAS

    Directory of Open Access Journals (Sweden)

    Danilo Calliari

    2003-01-01

    Full Text Available The marine areas of Uruguay consist of the Río de la Plata estuary and the adjacent shelf and slope, part of the Subtropical Convergence Ecosystem. In this paper, the main advances in the knowledge of marine life in these areas (the known are reviewed in order to discuss future lines of research (the unknown. Information has been separately analysed for the plankton, nekton, and benthos in each of 3 areas-the littoral, the shelfs and the "open ocean". Current knowledge of marine life is uneven among the groups and areas. In the case of the plankton, research has concentrated on the near-shore waters and focused on taxonomy and distribution. Little is known about the responses of organisms to environmental variability and about biological processes. The nekton of coastal and estuarine areas is better known, but, with shelf and slope assemblages, research has focused on exploited species. The main unknowns for the nekton are how trophodynamics, reproduction, and recruitment processes are linked to environmental variability and the effect of fisheries on community structure. Littoral benthos, in particular the macroinfauna of sandy beaches, is much better studied and spatial patterns of community distribution have been identified at different scales and in relation to environmental variables. Also, at the population level, there is information about distribution, responses to disturbances, dynamics, and the roles of biotic and abiotic factors in modulating population variability. Information is mainly lacking for the sub-tidal fringe and regarding the macro-ecology of population dynamics, the dispersive abilities of larval phases, and the effects of toxic blooms on suspension feeders. Knowledge of the benthos of estuaries and more so of the shelf and slope environments is rather scarce. For the latter two, faunal inventories are far from complete. Topics identified for future research include taxonomy, macro-scale community structure and its

  8. 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

    Directory of Open Access Journals (Sweden)

    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

  9. Assessment of Vegetative Phenology with Respect to Leaf Elongation Patterns on Avicennia marina and Rhizophora mucronata in Hajambro Creek, Indus D elta, Pakistan

    Directory of Open Access Journals (Sweden)

    Zafar Farooqui

    2014-05-01

    Full Text Available Leaves emergence and the rate of elongation have been studied in Hajambro creek in Indus deltaic region, Pakistan. Leaves emergence was observed higher during the summer months (mostly pre-monsoon period, that was March April, May and June. Leaves of A. marina that were observed from March to July, till the leaves reached their maximum length (about 77 mm, showed a gradual increase in their length, reaching maximum in April. Leaves of Avicennia marina reached their maximum length (about 77 mm in about 113 days. The leaves showed gradual increase in their length, reaching maximum on April (0.97mm d-1. The per-day increase in length was 0.54 mm d-1. As reaching their maximum length (77mm, the per-day increase in the length gradually slower down. The leaves of Rhizophora mucronata were seen from February to November. The leaves of Rhizophora mucronata showed elongation rate of 0.24 mm d-1 from the day of the first observation till the leaves reached their maximum length (120 mm. The maximum time required by the leaves to reach their maximum length (120 mm was 236 days. The rates of elongation of leaves are also fast in summer. The rate of e longation of the leaves was found to be highly correlated with the temperature (p<0.005. It was also found that the leaves grew faster on low salinity (in July and August. During these months, the salinity in the creek waters was the lowest (up to 10-12 ‰ when the downstream flow was the highest. The abscission time was found during September, October, November and December. Therefore, the leaves fall was found highly correlated with the litter fall research as most of the leaves fall was also higher during this drier season. Our results strongly endorsed the previous hypothesis that a fresh water is needed for the fast growth rates of mangroves. The stunted growth of Avicennia marina in the Indus delta, Sindh is due to a negligible amount of fresh water available to the delta, through downstream flow, only in

  10. GIS based Hydrogeological Vulnerability Mapping of Groundwater Resources in Jerash Area-Jordan

    Energy Technology Data Exchange (ETDEWEB)

    Hammouri, N [Department of Earth and Environmental Sciences, Faculty of Natural Resources and Environment, Hashemite University, Zarqa (Jordan); El-Naqa, A [Department of Water Management and Environment, Faculty of Natural Resources and Environment, Hashemite University, Zarqa (Jordan)

    2008-04-15

    This paper presents groundwater vulnerability mapping for Jerash area, north Jordan generated using EPIK and DRASTIC models. These models have been implemented using GIS to delineate groundwater protection zones and to suggest a protection plan to improve groundwater quality of the major springs and wells. Most of the groundwater resources in the study area are polluted and bacteria and nitrate levels are high. Different sources of groundwater pollution have been identified. Domestic wastewater is considered as a major source of pollution. Urban runoff, fertilizers from agricultural return flows and solid waste disposal appear to be secondary sources. The most relevant vulnerability class of EPIK map is very high which accounts for about 41 % of the total area. While in the DRASTIC vulnerability map, areas with high vulnerability were only about 23 % of the total area. There is a good correlation between vulnerability maps obtained from both models with microbiological and chemical pollution evidences. There is also a good agreement between the areas classified as highly vulnerable and those that have high levels of pollution. [Spanish] El estudio de vulnerabilidad de aguas subterraneas en la region de Yerash, Jordania fue obtenido mediante las metodologias de EPIK y DRASTIC. Se uso GIS para mapear las zonas protegidas y para sugerir un plan de proteccion para mejorar la calidad del agua subterranea en los principales manantiales y pozos. Los niveles de contaminacion bacteriana y de nitratos son elevados. El efluente domestico es la fuente mas importante de contaminacion; vienen en segundo lugar la precipitacion en zonas urbanas, los fertilizantes agricolas y los desechos solidos. En el mapa de EPIK, la vulnerabilidad extrema abarca hasta 41% del area total; en cambio, en el mapa de DRASTIC las areas de alta vulnerabilidad ocupan solo un 23% del area. La correlacion de los datos de contaminacion microbiana y quimica con ambos mapas der vulnerabilidad es buena

  11. 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..."

  12. 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

  13. 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

  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. 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.

  16. 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

    mineralization potential in bulk (reduced and presumably anoxic) sediment was significantly lower than for surface and burrow sediments. However, when the bulk sediments were oxidized, mineralization rates increased rapidly. Collectively, these data indicate that oxygen availability controlled pyrene......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......, altered pyrene bioavailability and/or a changed abundance or activity of pyrenedegrading bacteria. The presence of polychaetes enhanced microbial pyrene mineralization by 180 to 200% compared with defaunated sediment. Collectively, the replicates of the different treatments showed that mineralization...

  17. Effect of a polybrominated diphenyl ether congener (BDE-47) on growth and antioxidative enzymes of two mangrove plant species, Kandelia obovata and Avicennia marina, in South China.

    Science.gov (United States)

    Wang, Ying; Zhu, Haowen; Tam, Nora Fung Yee

    2014-08-30

    The effects of BDE-47 on the growth and antioxidative responses of the seedlings of Kandelia obovata (Ko) and Avicennia marina (Am) were compared in an 8-week hydroponic culture spiked with different levels of BDE-47, 0.1, 1, 5 and 10 mg l(-1). The two highest BDE-47 levels significantly suppressed the growth and increased the activities of three antioxidative enzymes, superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), of Ko in week 1. However, SOD and POD activities at high levels of BDE-47 became lower than the control in week 8. On the contrary, growth of Am was not affected at all contamination levels, and the activities of three enzymes were enhanced by BDE-47 in weeks 1 and 4, but such stimulatory effect became insignificant in week 8. Avicennia was more tolerant to BDE-47 toxicity than Kandelia, as its antioxidative enzymes could better counter-balance the oxidative stress caused by BDE-47. PMID:24631399

  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. Combined impact of water column oxygen and temperature on internal oxygen status and growth of Zostera marina seedlings and adult shoots

    DEFF Research Database (Denmark)

    Raun, Ane-Marie Løvendahl; Borum, Jens

    2013-01-01

    Eelgrass (Zostera marina L.) occasionally experiences severe die-offs during warm summer periods with variable water column oxygen partial pressures (pO). Eelgrass is known to be very intolerant to tissue anoxia with reduced growth and increasing mortality after ≤12h anoxia in the dark at...... temperatures of ≥25°C. In the present study we experimentally examine the impact of combined water column oxygen and temperature on oxygen dynamics in leaf meristems of seedlings and adult shoots to better understand how stressful environmental conditions affect eelgrass oxygen dynamics and subsequent growth...... and mortality. There was a strong interaction between water column oxygen and temperature on meristem pO implying that eelgrass is rather resistant to unfavorable oxygen conditions in winter but becomes increasingly vulnerable in summer, especially at high temperatures. At 25°C meristems became anoxic...

  1. Report and characterization of alternaria alternata (fr.) keissler on avicennia marina (forsk.) vierh forests of industrial yanb'a city, saudi arabia

    International Nuclear Information System (INIS)

    The present study was carried out to investigate the leaf spot disease of Avicennia marina (Forski) Vierh in Saudi Arabia. The leaf spot disease is reported for the first time in mangrove plants of SA. The symptoms of leaf spot disease and the morphological characters of the causal organism are also described. The radial growth and sporulation of A. alternata were variable with obvious trend on the different growth media. The optimum pH range for maximum growth was 6.0 to 6.5 and any fluctuation in pH caused significant decrease in linear growth of the mold. The chromatographic (TLC) analysis of chloroform extract of fungal culture broth indicated clearly that the mold was able to produce both alternariol and alternariol monomethyl ether. The gas liquid chromatographic analysis of mycelial fatty acids demonstrated the presence of caproic, caprylic, lauric, myristic, palmitic, margaric, stearic, arachidic, myristoleic, palmitoleic, oleic, linoleic, ? linolenic, Cis-11 eicosenoic, eicosatrienoic and arachidonic fatty acids in the mycelia of the causal organism. The analysis of free amino acids in the mycelia of causal organism indicated the presence of 13 amino acids namely, alanine, threonine, valine, proline, methionine, tryptophan, tyrosine, lysin, cystin, glycine, asparatic acid, tyrosine, and phenyl alanine. The PCR product amplified with A. alternata DNA indicates that the 370-bp PCR product is a useful diagnostic tool to identify the causal organism in mangrove leaves. This study demonstrated that the causal organism of leaf spot disease of A. marina was typically similar to Alternaria alternata (Fr.) Keissler via classical, biochemical and molecular characterization. (author)

  2. 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.

  3. Antifoulant (butyltin and copper) concentrations in sediments from the Great Barrier Reef World Heritage Area, Australia

    International Nuclear Information System (INIS)

    Antifoulant concentrations are generally low in the Great Barrier Reef, although ship grounding sites present a previously unidentified significant source of antifoulant pollutants in the Great Barrier Reef. - Antifoulant concentrations were determined in marine sediments collected from commercial harbours, marinas, mooring locations on mid-shelf continental islands, and outer reef sites in four regions within the Great Barrier Reef World Heritage Area in 1999. Highest copper concentrations were present in sediments collected from commercial harbour sampling sites (28-233 μg Cu g-1 dry wt.). In contrast, copper concentrations in sediments collected from boat mooring sites on mid-shelf continental islands and outer reef sites were at background concentrations (i.e. -1 dry wt.). Butyltin was only detectable in four of the 42 sediments sampled for analysis, and was only present in sediments collected from commercial harbours (18-1275 ng Sn g-1 dry wt.) and from marinas (4-5 ng Sn g-1 dry wt.). The detection of tributyltin at marina sites implies that this antifoulant may continue to be used illegally on the hulls of smaller recreational vessels. Sediment samples were also collected opportunistically from the site of a 22,000 t cargo ship grounding in May 1999 at Heath Reef, in the far northern Great Barrier Reef. Butyltin concentrations were grossly elevated (660-340,000 ng Sn g-1 dry wt.) at the grounding site. The impact of residual antifoulants at large ship grounding sites should be recognised as a significant, long-term environmental problem unless antfoulant clean-up strategies are undertaken

  4. Monitoring of the artificial reef fish assemblages of golfe juan marine protected area (France, North-Western Mediterranean

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    Bodilis Pascaline

    2011-01-01

    Full Text Available Artificial reefs were deployed within the Golfe-Juan marine protected area (Alpes-Maritimes coast, France, Northwestern Mediterranean created in 1981. This no-take area is fully protected since its establishment, except in 2004 when some anthropic activities were, exceptionally, authorized. Moreover, no park rangers to prevent poaching since 2002 occur. In order to carry out a long term monitoring of the artificial reef fish assemblages, underwater visual censuses (UVC were carried out in 1988, 1998 and 2008, according to a traditional standardized visual census method that taken into account all fish species. The complexification of some large reefs built with wide voide spaces called Bonna reefs appear to be a good solution to increase species richness and density. Species richness and density of the fish assemblages showed significant increase between 1988 and 1998. However the fast increasing was stopped from 1998 and 2008 probably due to a lack of law enforcement and poaching. Despite artificial reefs were deployed in MPA since at least 20 years, they did not show a real positive impact on fish assemblages. These results could be explained (i by a lack of law enforcement patrol within the protected areas during the last decade, and (ii by the one-year opening to fishing activities within MPA. The real effectiveness of the artificial reefs in sustaining fish assemblages is discussed and the necessity of a regular and efficient control by park rangers is highlighted.Recifes artificiais foram implantados na área protegida Golfe-Juan (costa dos Alpes-Maritimes, Noroeste do Mediterraneo criada em 1981. Esta área NTZ (Area de Restrição da Pesca é inteiramente protegida, desde seu estabelecimento, exceto em 2004, quando algumas atividades antropicas foram excepcionalmente autorizadas. Além disso, desde 2002, não houve nenhuma patrulha florestal para impedir a caça e pesca ilegais. . A fim realizar um monitoramento a longo prazo das assembl

  5. The Ability Of Mangrove Areas To Conserves Carbon Stock In Semi Arid Region

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    Aah Ahmad Almulqu

    2015-02-01

    Full Text Available ABSTRACT Above ground trees and poles biomass was estimated in Avicennie marina Rhizophora stylosa and Sonneratia alba of mangrove forest in Oebelo Central Kupang Regency East Nusa Tenggara Indonesia. The research was conducted from January 2013 to July 2013 and undestructive method was used trees and poles which having a diameter of less than 5 cm and over. Choosing the allometric equation based on the difficulties and practicality to get variable in the field become considerations. Results shows that carbon stock pattern different between all of trees and poles and increasing ranging of diameter will followed of biomass and carbon stock in all trees and poles. Species that contributed the largest amount of carbon was Sonneratia alba with the total carbon stored in all individuals of this species of about 59 of the total biomass stored on the research areas. This species had high number of individuals high average of diameter and height. At areas of research Sonneratia alba shared a maximum of 59 of the total biomass while Rhizophora stylosa and Avicennia marina shared 38 and 3 respectively.

  6. 培養条件下で観察された赤潮ラフィド藻 Chattonella marina の 高い増殖速度

    OpenAIRE

    今井, 一郎

    2012-01-01

    Growth of the fish-killing raphidophyte Chattonella marina MS3-P was examined in the 200 mL modified SWM-3 culture medium in a 500-mL flask at a temperature of 25C with light intensity of 120 mol photons m-2 sec-1 under a photo-cycle of 14hL-10hD. Growth conditions were supposed to be ideal and sufficient to achieve the potentially maximum growth rates, and the obtained growth rates were 1.42 and 1.48 divisions day-1. C. marina MS3-P also grew in the filter-sterilized (0.1 m pore) seawat...

  7. 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...

  8. 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.

  9. Propuesta de puntos de interés geológico y minero en el Área Natural Protegida El Orito. Distrito Minero de Guanajuato, México

    Directory of Open Access Journals (Sweden)

    María Jesús Puy y Alquiza

    2010-10-01

    Full Text Available The protected natural Area El Orito has a lithological, structural, geomorphological, mining and natural resources that deserve to be known for their heritage value. This document proposed ten points of geological and historic mining interest, in order to enhance the natural heritage and use it for sustainable development of that area. The points of geological and historic mining interest, aspart of the natural and cultural values of the Guanajuato mining district, which have a high potential for use in cultural tourism that allows the conservation, protection and valuation of natural areas.

  10. 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

  11. Depredación de aves marinas nocturnas en islotes de isla Guadalupe, México Predation of nocturnal seabirds on islets of Isla Guadalupe, Mexico

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    Eric Mellink

    2010-08-01

    Full Text Available A principios de junio de 2000, se realizó una prospección biológica de 3 islotes en el extremo sur de isla Guadalupe: islote de Afuera (o islote Zapato, islote de Adentro (o islote Toro e islote Negro, para documentar aves marinas anidantes. Se detectaron despojos de más de 100 paíños de Leach (Oceanodroma leucorhoa, 31 mérgulos de Xantus (Synthliboramphus hypoleuca y un alcuela de Cassin (Ptychoramphus aleuticus depredados. Las evidencias indican como el depredador de los paíños al tecolote llanero (Athene cunicularia, pero debido a su tamaño posiblemente no lo haya sido de los mérgulos, ni de la alcuela. Las características de los restos de los individuos depredados indican que eran de la población de paíños que anidó el invierno inmediato anterior. La información no es suficiente para determinar si dicha depredación representa un problema de conservación de aves marinas pequeñas en los islotes de la isla Guadalupe, pero sí sugiere que se debe estudiar más a fondo.In early June 2000 we surveyed 3 islets at the southern end of Isla Guadalupe, Mexico: Islote de Afuera (or Islote Zapato, Islote de Adentro (or islote Toro, and Islote Negro, to document nesting seabirds. We found vestiges of over 100 Leach's Storm-petrels (Oceanodroma leucorhoa, 31 Xantus Murrelets (Synthliboramphus hypoleuca, and 1 Cassin's Auklet (Ptychoramphus aleuticus that had been depredated. The evidences point to Burrowing Owls (Athene cunicularia as the predator of the storm-petrels, but, because of its size, probably other birds were involved in murrelet and auklet predation. Based on the characteristics of the remains, the depredated Leach Storm-petrels belonged to the population that had nested during the previous winter. The information is not sufficient to determine whether such predation represents a conservation problem for small seabirds on Isla Guadalupe, but suggest that the issue should be studied further.

  12. 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.

  13. Conflitos entre o Comperj e a gestão de áreas protegidas: o Mosaico Central Fluminense como possibilidade de enfrentamento a impactos socioambientais de grandes empreendimentos industriais

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    Breno Herrera da Silva Coelho

    2015-12-01

    Full Text Available The implementation of the Petrochemical Complex of Rio de Janeiro – COMPERJ in the city of Itaboraí-RJ, tends to generate social and environmental impacts on the surrounding protected areas, within the Atlantic Forest Central Fluminense Mosaic (MCF. During the licensing process of this enterprise, contradictions were found, which rose tensions among protected areas, social movements and the Federal Prosecution Service. Interpreting this case in light of concepts used in the field of political ecology and environmental justice, this paper discusses the institutional action of the councils of mosaics and protected areas in managing as well as addressing social and environmental impacts associated with the installation of large industrial enterprises, highlighting in particular the role of the council of the MCF and its mediation capacity with the government and corporate sectors.

  14. Avicequinone C Isolated from Avicennia marina Exhibits 5α-Reductase-Type 1 Inhibitory Activity Using an Androgenic Alopecia Relevant Cell-Based Assay System

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    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.

  15. Avicequinone C isolated from Avicennia marina exhibits 5α-reductase-type 1 inhibitory activity using an androgenic alopecia relevant cell-based assay system.

    Science.gov (United States)

    Jain, Ruchy; Monthakantirat, Orawan; Tengamnuay, Parkpoom; De-Eknamkul, Wanchai

    2014-01-01

    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. PMID:24858268

  16. 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.

  17. Ventilation and respiratory gas exchanges of the lugworm Arenicola marina (L.) as functions of ambient PO2 (20-700 torr).

    Science.gov (United States)

    Toulmond, A; Tchernigovtzeff, C

    1984-09-01

    Ventilatory regulation of intact, unrestrained lugworms Arenicola marina living in glass-tube artificial burrows was examined for values of inspired seawater PO2, PIO2, from 20 to 700 torr, at constant ambient pH and PCO2 values. The water ventilation rate and the respiratory characteristics of the ventilated seawater were measured. The water convection requirement and the corresponding specific rates of O2 uptake and CO2 production were calculated. The mean ventilatory water flow was a complex function of PIO2: decrease in hyperoxia, increase in hypoxia, decrease in extreme hypoxia. Compared to the normoxic responses, hyperoxia led to a hypercapnia (and acidosis) and moderate hypoxia to a hypocapnia (and alkalosis) in the expired water, variations which presumably reflect blood acid-base balance changes. Thus, as in other water breathers, the regulation of the organism's oxygenation may override the regulation of its acid-base balance. The lugworm's oxygen exchanger is highly efficient. However, below a critical partial pressure, PIO2 ca 120 torr, values of O2 consumption and ventilation decreased. A second critical O2 partial pressure appeared at PIO2 values between 80 and 40 torr; a 'switch-on' of anaerobic metabolism. These phenomena may be viewed as features of an adaptative respiratory strategy selected for in relation with the lugworm's particular peristaltic ventilatory mechanism and its intertidal mode of life. PMID:6441215

  18. 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. PMID:16996183

  19. 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.

  20. 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. PMID:27336306

  1. Accumulation of Trace Metal Elements (Cu, Zn, Cd, and Pb in Surface Sediment via Decomposed Seagrass Leaves: A Mesocosm Experiment Using Zostera marina L.

    Directory of Open Access Journals (Sweden)

    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.

  2. Temperature induced conformational changes in hybrid complexes formed from CdSe/ZnS nanocrystals and the phycobiliprotein antenna of Acaryochloris marina

    International Nuclear Information System (INIS)

    In hybrid systems which are self-assembled in solution from surface treated CdSe/ZnS quantum dots (QDs) and isolated phycobiliprotein (PBP) complexes from the cyanobacterium Acaryochloris marina, excitation energy transfer (EET) from the QDs to the PBP complexes was observed. The EET from the QDs to attached PBPs was analyzed with time integrated fluorescence spectroscopy and time-correlated single photon counting (TCSPC) at different temperatures. This functional connection between QDs and PBPs via EET is interrupted at temperatures below 273 K (0 °C) (Schmitt et al 2010 Photon. Nanostruct. submitted). The evaluation of the temperature-dependent fluorescence spectra of the QDs showed that the change of the excitation energy transfer efficiency at temperatures below 273 K cannot be explained by the change of the spectral overlap integral alone. Therefore the value of κ2/R126 must change at 273 K. We assume that micro crystals of water, formed in between the QDs and the PBP antenna structures, lead to a structural change of the hybrid complex. Our results show that TCSPC is suitable to distinguish strongly coupled and weakly coupled QD-PBP complexes at different temperatures

  3. Temperature induced conformational changes in hybrid complexes formed from CdSe/ZnS nanocrystals and the phycobiliprotein antenna of Acaryochloris marina

    Science.gov (United States)

    Schmitt, Franz-Josef

    2010-08-01

    In hybrid systems which are self-assembled in solution from surface treated CdSe/ZnS quantum dots (QDs) and isolated phycobiliprotein (PBP) complexes from the cyanobacterium Acaryochloris marina, excitation energy transfer (EET) from the QDs to the PBP complexes was observed. The EET from the QDs to attached PBPs was analyzed with time integrated fluorescence spectroscopy and time-correlated single photon counting (TCSPC) at different temperatures. This functional connection between QDs and PBPs via EET is interrupted at temperatures below 273 K (0 °C) (Schmitt et al 2010 Photon. Nanostruct. submitted). The evaluation of the temperature-dependent fluorescence spectra of the QDs showed that the change of the excitation energy transfer efficiency at temperatures below 273 K cannot be explained by the change of the spectral overlap integral alone. Therefore the value of κ2/R126 must change at 273 K. We assume that micro crystals of water, formed in between the QDs and the PBP antenna structures, lead to a structural change of the hybrid complex. Our results show that TCSPC is suitable to distinguish strongly coupled and weakly coupled QD-PBP complexes at different temperatures.

  4. Time resolved temperature switchable excitation energy transfer processes between CdSe/ZnS nanocrystals and phycobiliprotein antenna from Acaryochloris marina

    Science.gov (United States)

    Schmitt, F.-J.; Maksimov, E. G.; Suedmeyer, H.; Jeyasangar, V.; Theiss, C.; Paschenko, V. Z.; Eichler, H. J.; Renger, G.

    2011-04-01

    Hybrid systems were self-assembled in solution from surface treated CdSe/ZnS quantum dots (QDs) and isolated phycobiliprotein (PBP) complexes from the cyanobacterium Acaryochloris marina. The excitation energy transfer (EET) from the QDs to attached PBPs was analyzed by time correlated single photon counting and time integrated fluorescence measurements at different temperatures. It was found: The green emission of the QDs (3.3 nm diameter of the CdSe core) in solution at 530 nm becomes strongly quenched after addition of PBPs. The functional connection between QDs and PBPs via EET interrupts at temperatures below 273 K (0 °C) This temperature dependent effect is fully reversible EET from QDs to PBPs occurs with a time constant of about 140 ps and an efficiency of 85-90% for coupled QDs/PBP hybrid complexes. A model of the EET steps is presented which is based on data evaluation of the time integrated fluorescence emission and the time resolved measurement results via decay associated emission spectra (DAS). According to the theory of Förster Resonance Energy Tranfer (FRET) the average distance between the center of the QDs and the nearest neighbouring chromophore is estimated to be 3.2 nm.

  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. PMID:26119628

  6. Development and application of long-term sublethal whole sediment tests with Arenicola marina and Corophium volutator using Ivermectin as the test compound

    International Nuclear Information System (INIS)

    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. Geographic Distribution of the Tortoises and Freshwater Turtles of Colombia and their Representation in the Protected Area Network

    Directory of Open Access Journals (Sweden)

    German Forero-Medina

    2014-05-01

    Full Text Available Colombia has a remarkable diversity of tortoises and freshwater turtles. However, a considerable portion of these species is threatened, and for others there is not enough information to make an adequate evaluation of their conservation status. This study is a first approximation to the quantitative evaluation of the geographic distribution of Colombia’s non-marine chelonians. Based on records of occurrence for each species, we evaluated the geographic distribution using statistical models (Maxent, hydrological basins, and the extent of occurrence and area of occupancy. Based on the presence data and the models, we studied the representation of each species in National Natural Parks (NNP, which correspond to the most rigorous conservation category of IUCN classification in Colombia, and other types of protected areas such as Private Reserves. We generated distribution models and estimated the area (km2 for 25 out of 27 species in the country. This information will be valuable for updating and evaluating the threat categories at the national level. The areas with the highest species richness correspond to the riverine ecosystems of the Amazon and Orinoco river basins and the Caribbean region, particularly the western Caribbean. This region is a top priority not only because of its richness butalso because of the presence of endemics and its high levelof threat. Only 56 % of the species have confirmed recordswithin National Parks. A greater portion could be present in these areas according to the statistical models, but only ten of those species would have more than 10 % of their ranges within a park’s boundary. Although the resulting models have certain limitations due to the nature of the data and analyses, they can be a starting point for research on the occurrence of turtles in NNP. Endemic species are poorly represented in protected areas, both in NNP and in other categories. Thus, protected areas that can assure the persistence of their

  8. As áreas naturais protegidas e a responsabilidade social e ambiental das empresas: o caso do Mosaico da Mata Atlântica Central Fluminense e do Comperj

    Directory of Open Access Journals (Sweden)

    Gian Mario Giuliani

    2007-01-01

    Full Text Available The article thinks about the pressures that defy the “protected areas” in order to sustain their politics of conservation in the case that the territory had been chose for setting an enormous industrial complex. We refer to the construction of the Complexo Petroquímico do Rio de Janeiro (Comperj by the Petrobras Company at a very short distance from the Mosaico da Mata Atlântica Central Fluminense - MMACF (a whole of 22 protected areas and, particularly, from the Apa de Guapimirím,that is the last original haven of the mangrove system of the Guanabara Bay. It is reasonable to preview that the protected areas will suffer strong environmental and social impacts. We wont to make evident that the social and environmental responsibility flaunted by Petrobras is not preventive, in the sense of planning the actions anticipating their consequences and conceiving its project in order to avoid risks. Its social and environmental responsibility bases on attitudes that only aim at the containment of the principal predicted problems and at the compensation for the caused damages.

  9. Il restauro ed il riuso dell'ex frantoio Nesci a Bova Marina. Il recupero di una archeologia industriale

    Directory of Open Access Journals (Sweden)

    Fabio Mariano

    2013-09-01

    The work was aimed, in the first case, the restoration and recovery of the former Frantoio and make it available spaces and allocated to: cultural and educational activities, primarily in the field of preservation and conservation of cultural and environmental heritage of the area (conferences, seminars, training courses, workshops, etc.; proposal of a museum dedicated to the Jewish presence in the region of Calabria; provision of the necessary services to reception and use of space by the participants in the activities listed above.

  10. Human exploitation of seabirds in coastal southern Chile during the mid-Holocene Explotación humana de aves marinas durante el Holoceno medio en la costa del sur de Chile

    Directory of Open Access Journals (Sweden)

    ALEJANDRO SIMEONE

    2002-06-01

    Full Text Available We analyzed a collection of 738 bird bones, representing a minimum of 71 individuals, found in a settlement of hunter-gatherers from the mid-Holocene, 5,000 years BP, in the coastal locality of Chan Chan, southern Chile. The camp was inhabited for over ca. 500 years, during which time a steady hunting pressure on the local marine resources was exerted, particularly on seabirds. The most abundant taxon (bones/number of individuals was the red-legged cormorant Phalacrocorax gaimardi (551/44 which was also the prey which provided the highest edible proportion of body mass. Albatrosses Thalassarche cf. melanophris (103/12 and shearwaters Puffinus cf. griseus (20/5 were secondary prey. Cormorants were presumably hunted at their breeding colonies (which are still present in the area so it is probable that egging also occurred. Because they are pelagic, albatrosses could have been hunted at sea, but the adequate technology for this (boats, hooks is not apparent in the archaeological record. The bird assemblage obtained in the sample does not qualitatively differ from that of the present, indicating a reasonable stability in species richness from the considered period until the present. The high diversity of coastal resources in Chan Chan was likely important in leading to the, at least seasonal, occupation of these areas by hunter-gatherers and also may have encouraged the development of the adequate technology for the exploitation of these resourcesSe analizaron 738 restos óseos de aves, correspondientes a un mínimo de 71 individuos, encontrados en un asentamiento de cazadores-recolectores del Holoceno medio, 5.000 años AP, en la localidad costera de Chan Chan, sur de Chile. El campamento fue habitado durante al menos 500 años, tiempo durante el cual se ejerció una presión de caza persistente sobre los recursos marinos locales, particularmente las aves marinas. El taxón más numeroso (restos/ número de individuos fue el lile Phalacrocorax

  11. Valoración de canales de terneros pertenecientes a la indicacion geográfica protegida “Vedella dels Pirineus Catalans” - Data of beef carcasses belonging to the “Vedella dels Pirineus Catalans” label produced in Cataluña (Spain

    Directory of Open Access Journals (Sweden)

    Parés i Casanova, Pere-Miquel

    2009-02-01

    Full Text Available ResumenSe realizó un estudio de 641 canales de añojos (425 machos y 216hembras procedentes de 32 granjas. La edad promedio de los animalessacrificados fue de 345 días. Se les evaluó el peso, la conformación y el engrasamiento con el objeto de determinar los valores característicos de las canales de animales pertenecientes a la Indicación Geográfica Protegida (I.G.P. “Vedella dels Pirineus Catalans”. El peso de la canal caliente no mostró ninguna correlación com la conformación de la canal ni estado de engrasamiento, ni tampoco con la edad al sacrificio. Aunque losanimales cruzados presentaron eso de canal más elevado, los de raza“Bruna dels Pirineus” los valores estudiados aparecieron más equilibrados. Se propone que se estudie la posibilidad de excluir de la indicación I.G.P. “Vedella dels Pirineus Catalans”, los cruces con la raza “Bruna dels Pirineus” y restringir la denominación a esta única raza criada en pureza.SummaryIn this study, carcass performance from data on 641 young bulls (425males and 216 females belonging to 32 farms were evaluated. Animalswere slaughtered at an average age of 345 d. Carcass weight,conformation and fattening were evaluated. From these results the main carcass values in the label “Vedella dels Pirineus Catalans” areestablished. As it increases the carcass weight, no increase of the carcass conformation and fat grades is registered, and the carcass weight do no show a correlation with age. Based on effects, crosses had heavier carcass weights, but “Bruna dels Pirineus” showed more equilibrated values in the studied variables. A proposed aspect is the possibility to exclude crosses with “Bruna dels Pirineus” breed from the label I.G.P. “Vedella dels Pirineus Catalans” and to restrict the beef production to that pure breed.

  12. La educación e interpretación ambiental en las áreas silvestres protegidas del estado: La experiencia del Parque Nacional Conguillío (Región de La Araucanía para fomentar la conservación en los visitantes.

    Directory of Open Access Journals (Sweden)

    M. González

    2014-03-01

    Full Text Available Dentro de las Áreas Silvestres protegidas de la Región de la Araucanía, sur de Chile, se destaca el Parque Nacional Conguillío inserto en la precordillera andina. Considerado un área de gran importancia ecosistémica dada la diversidad de ambientes que presenta producto de la acción vulcanológica propia de esta cordillera, ésta unidad conforma parte del selecto grupo de Reserva de la Biosfera del país. En él es posible encontrar ecosistemas de bosque primario de Araucaria, humedales (incluyendo ríos, lagos y esteros, escoriales y altas cumbres como es el Volcán LLaima y Sierra Nevada, todas de importante valor científico, geológico, geomorfológico y turístico. Su alta concurrencia por sus atractivos escénicos, flora y fauna, generan una importante llegada de visitantes, nacionales y extranjeros especialmente en época estival dado las mejores condiciones metereológicas y la temporada de vacaciones. Es por ésta razón, que el programa de educación e interpretación ambiental creado pioneramente hace 37 años y actualmente vigente como actividades para sus visitantes adultos y niño(as, cobra un mayor sentido de pertenencia para el visitante a través de una experiencia en un ASPE. Las actividades como experiencia, buscan la generación de nuevas actitudes que involucren una conducta del visitante orientada a la sostenibilidad del parque y la apreciación del entorno natural como parte fundamental en el desarrollo del ser humano. En este contexto, el programa actual muestra un crecimiento sostenido de un 7% en número de visitantes entre temporada 2013-2014, siendo objetivo de este trabajo el mostrar antecedentes generales del parque, los senderos más visitados, las especies de flora y fauna más atractivas y/o con problemas de conservación, así como el programa en cuanto a las actividades y sus proyecciones de mejora.

  13. 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.

  14. 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.

  15. Physiological response of Avicennia marina seedlings to the phytotoxic effects of the water-soluble fraction of Light Arabian crude Oil

    International Nuclear Information System (INIS)

    Stomatal behavior, growth performance and accumulation of polynuclear aromatic hydrocarbons (PAHs) were evaluated in seedlings of the mangrove Avicennia marina (Forssk.) Vierh, treated with the water soluble fraction (WSF) of Abu-Dhabi light Arabian crude oil through foliar spraying or soil application. Irregular stomatal behavior and weak stomatal control over transpiration was observed during the first 24 hours, where stomatal resistance of plants sprayed 150 and 300 (gPAHs plant-1) was significantly lower than that of the control plants. After 6 weeks all treated plants showed no significant difference in their elative growth rate (RGR) or in the net assimilation rate (NAR) compared with the control plants. Tri-aromatic hydrocarbons were the most accumulated in tissues of the treated plants. Penta- and hexa-aromatics, on the other hand, were undetectable in the WSF and consequently in the treated plants. A linear relationship was observed between the dose applied to the plants and the amounts of tissue accumulated PAHs (r=0.515 for soil application and r=0.984 for foliar spray). In plants sprayed with 300 (gPAHs plant-1, the total PAHs accumulated were more than that accumulated in plants with treated through soil application. These findings suggest that :( 1) Aqueous extraction of crude oil tends to signify the percentage of the low molecular weight PAHs, e.g. naphthalene to the total PAHs. (2) Disturbed stomach behavior in the first day of the treatment may be due to the venting of the volatile low molecular weight aromatic hydrocarbons (e.g. benzene, toluene and xylenes) through the stomata. (3) Uptake of water-soluble hydrocarbons by plants is equally possible through both the root system and the foliage. The ecological implications of these findings are discussed in relation to oil pollution of mangrove stands under field conditions. (author)

  16. Primer Resultado del Proyecto Territorial Educación Popular Ambiental para la mejora del manejo de los Desechos Sólidos en La Marina

    Directory of Open Access Journals (Sweden)

    Roberto A. González Castellanos

    2010-10-01

    Full Text Available Se presentan los primeros resultados del Proyecto Territorial "Educación Popular Ambiental para la mejora del manejo de los Desechos Sólidos en , dirigido a demostrar en el barrio de La Marina la solución, aplicable para toda la ciudad, para el manejo de los RSM y las posibilidades de mejorar la situación presente a través de un cambio en las conductas de los afectados y de su participación activa y protagonismo en la solución de dicho problema. El Proyecto se concentró en el inicio del proceso de educación de la población de la comunidad y de otras personas implicadas y es parte del trabajo comunitario que se desarrolla en dicho barrio. Además, en forma paralela, se trabaja actualmente en la fundamentación de otro Proyecto Territorial que comenzará cuando se termine la imprescindible etapa de educación popular y que consistirá en la aplicación práctica en ese barrio de la concepción propuesta, desde la separación doméstica de los RSM hasta el compostaje de la fracción orgánica, para su uso en los organopónicos que se desarrollan en ese barrio, y la instalación de un digestor anaerobio de pequeña escala, como muestra de las posibilidades de aplicar esta concepción en un periodo posterior a toda la ciudad de Matanzas.   

  17. 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

  18. 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

    International Nuclear Information System (INIS)

    Highlights: • Sea grass accessory pigments are more important than Chl at medium to low light intensity. • Partial absorption changes in Thalassia and also in Halodule at low intensity visible light ranges. • NDVI and chlNDI do not detect these changes or low light responses of sea grasses. • Intertidal sea grasses are less stressed than the subtidal species at low and high light. • Chl b is an important photosynthetic pigment in tropical/subtropical species. - Abstract: 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 6 h 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

  19. Fuerzas Armadas y desarrollo energético en la Argentina: el papel de la Marina de Guerra en la primera mitad del siglo XX

    Directory of Open Access Journals (Sweden)

    Gustavo A. Pontoriero

    2013-01-01

    Full Text Available El interés de la Armada argentina por lograr el autoabastecimiento energético para movilizar sus buques y asegu-rar la defensa de la soberanía llevó a que un grupo de sus oficiales más destacados reclamaran a la institución y al Estado una actitud más decidida. Las lecciones que dejaron las sucesivas guerras desde fines del siglo XIX sobre el valor estratégico de los recursos energéticos y su disponibilidad para la producción y movilización de los ele-mentos bélicos, acentuaron aún más su preocupación al respecto. La Marina de Guerra intervino en la explora-ción y explotación de los recursos carboníferos, petroleros e hidroeléctricos, y luego su papel fue muy importante en el desarrollo de la energía nuclear en la Argentina. En este trabajo analizaremos los orígenes del proceso de formación de una élite técnica con alto grado de forma-ción profesional y conciencia industrialista en el seno de la Armada, e interesada en el desarrollo del sector ener-gético nacional. En el estudio, durante la primera mitad del siglo XX, utilizaremos artículos, conferencias, memo-rias e información de los expedientes personales de un grupo de oficiales navales que querían aumentar el control estatal sobre los recursos estratégicos y las industrias relacionadas con la defensa.

  20. Mixed Sex Effects on the Second-to-Fourth Digit Ratio of Túngara Frogs (Engystomops pustulosus) and Cane Toads (Rhinella marina).

    Science.gov (United States)

    Beaty, Lynne E; Emmering, Quinn C; Bernal, Ximena E

    2016-04-01

    Sexual dimorphism in the ratio of digit lengths has been correlated to behavioral, physiological, and morphological traits in a variety of taxa. While sexual dimorphism in the second-to-fourth digit length ratio (2D:4D) is a well-established indicator of prenatal androgen exposure in mammals, investigations into the patterns of 2D:4D and the drivers of such variation in other taxa are lacking. We used linear mixed effects models to gain a mechanistic understanding of the factors that drive variation in the scaling relationship between the lengths of the second and fourth digits in two species of anurans: túngara frogs (Engystomops pustulosus) and cane toads (Rhinella marina). We found evidence for sexual dimorphism of the 2D:4D scaling relationship on the front feet of túngara frogs, with female frogs having a larger ratio than males resulting from a relatively longer second digit on females. To our knowledge, this mammal-like pattern of sex differences in digit ratio has not yet been reported for anurans. However, given the reduced number of digits on the front feet of anurans, and uncertainty about which digit was lost during evolutionary history, this apparent sexual dimorphism in the front feet of túngara frogs should be treated with caution. In contrast, we found no evidence of sexual dimorphism in 2D:4D on either the front or rear feet of cane toads. This study highlights ambiguities in 2D:4D across taxa and suggests that further research is needed to evaluate the effect of androgens on 2D:4D in animals other than placental mammals. Anat Rec, 299:421-427, 2016. © 2016 Wiley Periodicals, Inc. PMID:26815928