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Sample records for cianobacteria marina oscillatoria

  1. Cianoalerta: estrategia para predecir el desarrollo de cianobacterias tóxicas en embalses

    Directory of Open Access Journals (Sweden)

    E. Forján Lozano

    2008-01-01

    Full Text Available La eutrofización de los pantanos destinados al abastecimiento de agua de consumo humano supone un deterioro de la calidad de la misma, e incluso puede afectar a la salud de los consumidores. Éste es el caso de la presencia de la hepatotoxina microcistina, producida fundamentalmente por la cianobacteria Microcystis aeruginosa. A través de los proyectos Cianoalerta hemos desarrollado métodos para la pronta detección de blooms específicos de cianobacterias, necesarios para llevar a cabo un adecuado tratamiento del agua, evitando el suministro de un producto de baja calidad a los consumidores. El análisis de la evolución estacional de cianopigmentos, y su correlación con la abundancia y dinámica de las poblaciones de microorganismos fotosintéticos ha permitido concluir que la evolución estacional de zeaxantina y beta-caroteno presenta una dinámica muy similar a la evolución observada de las poblaciones de las cianobacterias Oscillatoria spp, Anabaena spp. y formas cocoides de cianobacterias, y diferente a la evolución de Microcystis spp. De acuerdo con nuestros resultados, estos fotopigmentos podrían emplearse como indicadores de la proliferación de estas poblaciones.

  2. 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.

  3. Comunidad de cianobacterias durante el ciclo de cultivo de arroz: Oriza sativa L. Cyanobacteria during a rice (Oriza sativa L. crop cycle

    Directory of Open Access Journals (Sweden)

    Cecilia Isabel Sánchez

    2007-07-01

    Full Text Available El desarrollo de las cianobacterias en el cultivo de arroz se ve afectado por diferentes factores abióticos entre ellos la temperatura. El objetivo de nuestro trabajo fue analizar la evolución de la comunidad de cianobacterias durante el ciclo del cultivo de arroz en sitios con diferentes temperaturas del agua de inundación. El cultivo fue regado con agua subterránea. Se compararon dos ubicaciones respecto de la entrada del agua al lote. En macollaje, a los tres días desde la inundación, los recuentos de cianobacterias totales fueron similares en los dos sitios, pero difirieron en los muestreos de panoja embuchada y madurez fisiológica. Los géneros encontrados durante todo el ciclo fueron: Chroococcus, Aphanocapsa y Gloeocapsa (unicelulares, Oscillatoria, Lyngbya y Arthrospira (filamentosas no heterocísticas, Anabaena, Nostoc,Cylindrospermunm y Gloeotrichia (filamentosas heterocísticas. Las cianobacterias filamentosas heterocísticas no superaron el 45% y, en la mayoría de los muestreos, osciló alrededor del 25%. En la zona de mayor temperatura, la proporción de cianobacterias unicelulares fue mayor, y menor la de filamentosas no heterocísticas, la cual fue menor al 2% durante todo el ciclo. Los valores de diversidad de Simpson fueron mayores en la zona de mayor temperatura en cada uno de los momentos de muestreo. Los géneros dominantes fueron unicelulares (Chroococcus y Gloeocapsa en cinco de los seis muestreos. En ambos sitios, el género Chroococcus siempre estuvo presente. Gloeocapsa y Nostoc aparecieron a partir de panoja embuchada y los géneros Cylindrospermum y Gloeotrichia en madurez fisiológica.Abiotic factors as temperature affect cyanobacterial growth in rice crop fields. The aim of our study was to evaluate cyanobacteria during rice crop development in two crop areas with different water temperature. We worked in a rice crop flooded with subterraneous water. We sampled two sites that differed in the distance from the

  4. Acoustic Streaming, The “Small Invention” of Cianobacteria?

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    Koiller, Jair

    2010-12-01

    Full Text Available Micro-engineering pumping devices without mechanical parts appeared “way back” in the early 1990’s. The working principle is acoustic streaming. Has Nature “rediscovered” this invention 2.7 Gyr ago? Strands of marine cyanobacteria Synechococcus swim 25 diameters per second without any visible means of propulsion. We show that nanoscale amplitude vibrations on the S-layer (a crystalline shell outside the outer membrane present in motile strands and frequencies of the order of 0.5-1.5 MHz (achievable by molecular motors, could produce steady streaming slip velocities outside a (Stokes boundary layer. Inside this boundary layer the flow pattern is rotational (hence biologically advantageous. In addition to this purported “swimming by singing”, we also indicate other possible instantiations of acoustic streaming. Sir James Lighthill has proposed that acoustic streaming occurs in the cochlear dynamics, and new findings on the outer hair cell membranes are suggestive. Other possibilities are membrane vibrations of yeast cells, enhancing its chemistry (beer and bread, keep it up, yeast!, squirming motion of red blood cells along capillaries, and fluid pumping by silicated diatoms.

    Los mecanismos de bombeo en microingeniería aparecieron al principio de la década de los 90. El principio detrás de esto es el de flujo acústico. ¿Ha descubierto la Naturaleza este invento de hace 2.700 millones de años? Algunas cianobacterias marinas de la especie Synechococcus nadan 25 diámetros por segundo sin ningún medio visible de propulsión. Especulamos en este artículo que vibraciones de amplitud de nanoescala del estrato S (una cáscara cristalina que cubre las membranas exteriores en las cepas móviles y con frecuencias del orden de 0,5-1,5 MHz (y esto es factible por los motores moleculares, podrían producir velocidades de deslizamiento del fluido, en el exterior de la frontera de la región Stokes. Dentro de esta capa límite (que

  5. Detección de cianobacterias y sus toxinas. Una revisión

    OpenAIRE

    J. Roset; Aguayo, S.; Muñoz, M J

    2001-01-01

    La creciente eutrofización de los ambientes acuáticos favorece el crecimiento masivo (blooms) de algas, y poblaciones de cianobacterias, capaces de producir potentes toxinas con graves repercusiones en la salud pública y en la sanidad animal. Más del 50% de las proliferaciones masivas de cianobacterias son tóxicas. Dentro de una misma especie de cianobacteria, existen cepas que producen toxinas y otras que no las producen. Se hace necesario disponer de métodos que perm...

  6. Detección de cianobacterias y sus toxinas. Una revisión

    Directory of Open Access Journals (Sweden)

    J. Roset

    2001-01-01

    Full Text Available La creciente eutrofización de los ambientes acuáticos favorece el crecimiento masivo (blooms de algas, y poblaciones de cianobacterias, capaces de producir potentes toxinas con graves repercusiones en la salud pública y en la sanidad animal. Más del 50% de las proliferaciones masivas de cianobacterias son tóxicas. Dentro de una misma especie de cianobacteria, existen cepas que producen toxinas y otras que no las producen. Se hace necesario disponer de métodos que permitan detectar y cuantificar cianobacterias y sus toxinas. Los tradicionales bioensayos en ratón para conocer la toxicidad de una muestra sospechosa, se van sustituyendo por otros bioensayos y diversos métodos in vitro que están demostrando ser eficaces. El avance experimentado en las técnicas inmunológicas y enzimáticas ha facilitado la detección rápida de toxinas mediante el empleo de kits comerciales y no comerciales. Uno de los campos más prometedores de investigación, consiste en la determinación de las secuencias genéticas que diferencian géneros incluso cepas tóxicas, así como otras que codifican para la síntesis de toxinas; métodos que permitirán prever el desarrollo de cianobacterias o sus toxinas. El control y seguimiento de los desarrollos masivos de cianobacterias, es muy importante para garantizar la calidad del agua. El reconocimiento de los factores ambientales que influyen o desencadenan la aparición de blooms, es otro factor fundamental para la prevención y el control.

  7. Cianoalerta: estrategia para predecir el desarrollo de cianobacterias tóxicas en embalses

    OpenAIRE

    E. Forján Lozano; M.J. Domínguez Vargas; C. Vilchez Lobato; de Miguel, R.; Costa, C; M.P. Reis

    2008-01-01

    La eutrofización de los pantanos destinados al abastecimiento de agua de consumo humano supone un deterioro de la calidad de la misma, e incluso puede afectar a la salud de los consumidores. Éste es el caso de la presencia de la hepatotoxina microcistina, producida fundamentalmente por la cianobacteria Microcystis aeruginosa. A través de los proyectos Cianoalerta hemos desarrollado métodos para la pronta detección de blooms específicos de cianobacterias, necesarios para llevar a cabo un adec...

  8. Cianoalerta: estrategia para predecir el desarrollo de cianobacterias tóxicas en embalses

    OpenAIRE

    Forján Lozano, Eduardo; Domínguez Vargas, María José; Vílchez Lobato, Carlos; de Miguel, R.; Costa, C; M.P. Reis

    2008-01-01

    La eutrofización de los pantanos destinados al abastecimiento de agua de consumo humano supone un deterioro de la calidad de la misma, e incluso puede afectar a la salud de los consumidores. Éste es el caso de la presencia de la hepatotoxina microcistina, producida fundamentalmente por la cianobacteria Microcystis aeruginosa. A través de los proyectos Cianoalerta hemos desarrollado métodos para la pronta detección de blooms específicos de cianobacterias, necesarios para llevar a c...

  9. 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.

  10. Sistemas de transporte de aminoácidos, amonio y urea en cianobacterias

    OpenAIRE

    Montesinos Gutiérrez, María Luz

    1997-01-01

    Al finalizar esta Tesis Doctoral, hemos sacado las siguientes conclusiones: 1. Las Cianobacterias son capaces de transportar un amplio rango de aminoácidos mediante un bajo número de sistemas de transporte que muestran, en general, baja especificidad de sustrato. Todas las estirpes estudiadas poseen, al menos, un sistema de transporte de aminoácidos neutros. 2. El sistema de transporte de aminoácidos neutros de Synechocystis sp. PCC 6803 y uno de los presentes en Anabaena sp. PCC 7120 son ...

  11. Estudio funcional de la ribonucleasa P de la cianobacteria Synechocystis sp. PCC 6803

    OpenAIRE

    Pascual, Alberto

    1998-01-01

    Los RNA transferentes se sintetizan como precursores y deben ser madurados post-transcripcionalmente a RNA transferentes maduros. La maduración del extremo 5' de los RNAs transferentes la realiza la ribonucleasa P (RNasa P). La RNasa P bacteriana posee dos subunidades, una RNA y otra proteína. El RNA cataliza la reacción en ausencia de proteínas en determinadas condiciones in vitro. En esta tesis se ha estudiado la RNasa P de cianobacterias. Se ha clonado el gen codificante del componente RNA...

  12. Estudio de las glutamato sintasas de la cianobacteria Synechocystis sp. PCC 6803

    OpenAIRE

    Navarro Gómez, Francisco

    1996-01-01

    El objetivo de este trabajo fue, en principio, la caracterización del gen de la Fd-GOGAT de Synechocystis 6803, así como de la proteína correspondiente y el análisis de mutantes del mismo. El descubrimiento de dos enzimas con actividad glutamato sintasa en esta cianobacteria, llevó a un estudio de los genes correspondientes y a un análisis comparativo de los mismos, entre sí y con el resto de secuencias de glutamato sintasas disponibles. La obtención de mutantes simples de cada gen y de mut...

  13. Accelerating of Pink Pigment Excretion from Cyanobacterium Oscillatoria by Co-Cultivation with Anabaena

    Directory of Open Access Journals (Sweden)

    DWI SUSILANINGSIH

    2007-03-01

    Full Text Available The freshwater cyanobacterium Oscillatoria BTCC/A 0004 excretes pink pigment containing lipoproteins with molecular weights of about 10 kDa. This pigment has surfactant properties with strong emulsification activity toward several hydrocarbons. This extracellular metabolite was suspected as toxin or allelochemical in their habitat. In this study, I investigated the effect of co-cultivation of Oscillatoria with Anabaena variabilis on the pigment excretion to explore the physiological roles of this pigment in its natural environment. The dead or viable cells and medium of A. variabilis were added into Oscillatoria cultures. Results showed that co-cultivation of free viable cells of A. variabilis enhanced the excretion of pigment without effect on the cell growth. Co-cultivation with viable cells in separated method and dead cells did not influenced the pigment production. The addition of A. variabilis medium was slightly increased the excretion of the pigment. Those results indicated that direct contact with A. variabilis caused Oscillatoria released a certain signaling compound.

  14. Classical and Alternative Activation of Cyanobacterium Oscillatoria sp. Lipopolysaccharide-Treated Rat Microglia in vitro.

    Science.gov (United States)

    Mayer, Alejandro M S; Murphy, Joseph; MacAdam, David; Osterbauer, Christopher; Baseer, Imaan; Hall, Mary L; Feher, Domonkos; Williams, Phillip

    2016-02-01

    The purpose of this investigation was to test the hypothesis that an in vitro exposure to cyanobacterium Oscillatoria sp. Lipopolysaccharide (LPS) might result in classical and alternative activation of rat neonatal microglia. Using Escherichia coli LPS-primed microglia as a positive control, this study revealed that treatment of rat microglia with Oscillatoria sp. LPS for 17 h in vitro resulted in both classical and alternative activation as well as concomitant pro-inflammatory and anti-inflammatory mediator release, in a concentration-dependent manner: (1) treatment with 0.1-10 000 ng/ml Oscillatoria sp. LPS resulted in minimal lactic dehydrogenase (LDH) release, induced concentration-dependent and statistically significant O2 (-) generation, matrix metalloproteinase-9 (MMP-9) release, generation of the cytokines tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6), and the chemokines macrophage inflammatory protein-2 (MIP-2/CXCL2), interferon γ-induced protein 10 kDa (IP-10/CXCL-10), (MIP-1α/CCL3), monocyte chemotactic protein-1 (MCP-1/CCL2), regulated on activation, normal T cell expressed and secreted (RANTES/CCL5), and the alternative activation cytokine IL-10; (3) in contrast, treatment with 100 000 ng/ml Oscillatoria sp. LPS appeared to damage the microglia cell membrane, because it resulted in minimal O2 (-) generation, statistically significant LDH release, and a decrease in the generation of all the cytokines and chemokines investigated, with the exception of IL-1α and cytokine-induced neutrophil chemoattractant 1 (CINC-1/CXCL1) generation, which was increased. Thus, our results provide experimental support for our working hypothesis, namely that Oscillatoria sp. LPS induces classical and alternative activation of rat brain microglia in vitro in a concentration-dependent manner, namely 0.1-10 000 ng/ml Oscillatoria sp. LPS, when microglia cells were shown to be viable. Furthermore, should cyanobacterium Oscillatoria sp. LPS gain

  15. Cianobacterias en diferentes estadíos fenológicos del cultivo de arroz en Entre Ríos (Argentina Cyanobacteria in differents phenology stages of rice cropp in Entre Ríos (Argentina

    Directory of Open Access Journals (Sweden)

    Cecilia Isabel Sánchez

    2011-12-01

    Full Text Available El objetivo del trabajo fue analizar número y géneros de cianobacterias en arroceras de Entre Ríos en diferentes estadios del cultivo durante dos años. Se empleó la técnica de recuento microscópico en agua y suelo y se realizó una comparación de medias para establecer diferencias en los estadíos macollaje, panoja embuchada y madurez fisiológica. La identificación se realizó por características morfológicas, agrupándolas en unicelulares, filamentosas heterocísticas y no heterocísticas. Se calculó la riqueza y el Índice Recíproco de Simpson. Los recuentos en agua tuvieron un patrón de distribución similar en los dos años. En macollaje se registraron los menores recuentos y estos difirieron significativamente entre el primer y segundo año. El máximo recuento se observó en panoja embuchada en los dos años (3,6x10(4 y 4,0x10(4 células mL-1, respectivamente. En suelo, la población exhibió una evolución diferente en los dos años de análisis y difirieron significativamente en macollaje y panoja embuchada. En el primer año se registraron 11 géneros, y 10 en el segundo. Los géneros Lyngbya, Oscillatoria, Anabaena, Nostoc, Aphanocapsa, Chroococcus, y Gloeocapsa se observaron los dos años. Nostoc y Anabaena etuvieron presentes en la mayoría de los muestreos. Las cianobacterias unicelulares Aphanocapsa, Chroococcus y Gloeocapsa fueron dominantes en suelo. El Índice Recíproco de Simpson aumentó con los estadios del arroz en el segundo año de evaluación. La riqueza aumentó en panoja embuchada por una mejor adaptación a las condiciones del medio. La proporción de cianobacterias heterocísticas en agua fue diferente en los dos años evaluados (50% y 26% para el primer y segundo año.The aim of this study was to analyze the number and genera of cyanobacteria of rice crop fields of Entre Ríos at different phenological stages during two years. The microscopic cyanobacteria count in water and soil techniques were used

  16. ANTICANCER ACTIVITY OF OSCILLATORIA TEREBRIFORMIS CYANOBACTERIA IN HUMAN LUNG CANCER CELL LINE A549

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    S.Mukund

    2014-04-01

    Full Text Available Purpose: To evaluate the anti-cancer properties of the cyanobacterial extract of Oscillatoria terebriformis Methods: The extract was tested in Human lung cancer cell lines and examined for its effect on cell viability, nuclear morphology and sub-G1 formation. Cell viability was determined by micro culture tetrazolium technique (MTT, nuclear morphology investigated using 4’-6-diamidino-2-phenylindole (DAPI staining technique, and apoptosis assay using DNA fragmentation. Results: The results showed decreasing cell viability in a concentration-dependent manner. Altered cell morphology after treatment with the extract demonstrated that cells experienced apoptosis. Conclusion: The data demonstrate that Oscillatoria Terebriformis extract induced apoptosis in Human lung cancer A549 cells, and therefore, has a potential as an anti-cancer agent.

  17. Biología molecular de las gliceraldehído-3-fosfato deshidrogenasas de cianobacterias y microalgas eucarióticas

    OpenAIRE

    Valverde Albacete, Federico

    1999-01-01

    Se ha estudiado el sistema formado por las enzimas gliceraldehído-3-fosfato deshidrogenasas (GAPDH) en cianobacterias y microalgas como modelo en la bioenergética de la fotosíntesis. En cianobacterias se expresa mayoritariamente una enzima GAPDH2 anfibólica, tanto por su dependencia del cofactor nucleotídico (NAD ó NADP) como por su participación en rutas anabólicas y catabólicas, por lo que ha sido considerada como una nueva enzima por la IUBMB con el número de identificación EC 1.2.1.59. El...

  18. Impacto del petróleo en la distribución y biomasa de las cianobacterias en ecosistemas naturales y artificiales

    OpenAIRE

    Diestra Villanueva, Elia

    2006-01-01

    Consultable des del TDX Títol obtingut de la portada digitalitzada En el presente trabajo se ha estudiado el efecto del petróleo en las cianobacterias, bacterias fototróficas oxigénicas que forman las poblaciones dominantes de los tapetes microbianos. Se trata de ambientes bentónicos estratificados situados en costas litorales y que se encuentran en ocasiones expuestos a los vertidos accidentales de petróleo. El papel de las cianobacterias en la bioreparación del crudo es un tema que su...

  19. NucA, una nucleasa de baja especifidad de sustrato de las cianobacterias filamentosas formadoras de heterocistos

    OpenAIRE

    Muro Pastor, Alicia María

    1992-01-01

    En este trabajo se aborda la caracterización a nivel molecular de una actividad nucleasa inespecífica presente en las células y el medio extracelular de Anabaena sp. PCC 7120 y Anabaena variabilis ATCC 29413, un aspecto previamente inexplorado de ... la biología de las cianobacterias. Se presenta la clonación del gen nucA de Anabaena sp. PCC 7120, que codifica dicha nucleasa, y la generación, mediante sustitución génica, de estirpes mutantes en este gen derivadas de las estirpes PCC 7120 y AT...

  20. Influencia de la salinidad sobre crecimiento y composición bioquímica de la cianobacteria Synechococcus sp.

    Directory of Open Access Journals (Sweden)

    2005-01-01

    Full Text Available El estudio de cianobacterias aisladas de ambientes hipersalinos es de interés debido a su versatilidad metabólica y ecofisiológica para adaptarse a condiciones extremas de salinidad, temperatura, irradiancia y limitación de nutrientes. Se reporta el efecto de la salinidad a 0‰, 35‰, 70‰ y 100‰ sobre el crecimiento, masa seca y producción de pigmentos, proteínas, carbohidratos y lípidos de la cianobacteria Synechococcus sp. Los bioensayos fueron mantenidos con medio ALGAL equivalente a 8 mM NaNO3, aireación constante, fotoperiodo 12:12 h, 28 ± 2ºC y 156 µmol quanta m–2 s–1 de irradiancia. La cianobacteria fue capaz de crecer bajo todas las salinidades probadas. La densidad celular fue mejorada a 35‰, con 607.64 ± 14.35 cél mL–1. A 100‰ se alcanzaron los máximos valores de masa seca, clorofila a, β-caroteno, zeaxantina, proteínas y carbohidratos con 3.87 ± 0.03 ng cél–1; 41.86 ± 0.39 fg cél–1; 9.03 ± 0.15 fg cél–1; 9.74 ± 0.24 fg cél–1; 1.95 ± 0.05 y 1.80 ± 0.05 pg cél–1, respectivamente. Sin embargo, el mayor contenido de lípidos fue alcanzado a 0‰ con 0.45 ± 0.04 pg cél–1. Esta cepa halotolerante de la cianobacteria Synechococcus muestra capacidad para modular la producción de biomasa enriquecida con pigmentos, proteínas, carbohidratos y lípidos en función de la salinidad.

  1. PRODUCCIÓN DE BIODIÉSEL A PARTIR DE MICROALGAS Y UNA CIANOBACTERIA CULTIVADAS EN DIFERENTES CALIDADES DE AGUA

    OpenAIRE

    Manuel Sacristán-de Alva; Víctor M. Luna-Pabello; Erasmo Cadena-Martínez; Alejandro F. Alva-Martinez

    2014-01-01

    La producción de biodiésel, a partir de microorganismos fotosintéticos, es un tema de creciente investigación. No obstante, las implicaciones de la remoción de nutrientes y capacidad de acumulación de lípidos se desconocen cuando los microorganismos se cultivan en aguas residuales muni - cipales respecto de su cultivo en un medio enriquecido. En el presente estudio se evaluó el potencial de dos especies de microalgas, Chlorella vulgaris y Scenedesmus acutus , y de una cianobacteria, Arthr...

  2. A preliminary study of the algicidal mechanism of bioactive metabolites of Brevibacillus laterosporus on Oscillatoria in prawn ponds.

    Science.gov (United States)

    Jia, Wen; Huang, Xianghu; Li, Changling

    2014-01-01

    The algae, Oscillatoria, is commonly found in prawn ponds and can lead to reduced productivity. We examined metabolites of the bacteria Brevibacillus laterosporus for algicidal qualities. To determine the possible algicidal mechanisms of these bioactive metabolites, different amounts of sterile filtrate of bacterial suspensions were added to cultures containing Oscillatoria. The dry weight, the concentrations of chlorophyll-a (chl-a), phycobiliprotein (PC, phycocyanin; APC, allophycocyanin; PE, phycoerythrin), and MDA (malondialdehyde) and the activities of SOD (superoxide dismutase), POD (peroxidase), and CAT (catalase) of algae were measured during the algicidal application. The results showed that lower concentrations of the sterile filtrate (addition ≤ 4 mL) accelerated the growth rate of Oscillatoria, but significant inhibition and lysis were observed with higher concentrations (addition ≥ 8 mL). In two trials (the additions were 8 mL and 10 mL, respectively), the algal dry weights were reduced by 26.02% and 45.30%, and the chl-a concentrations were decreased by 46.88% and 63.73%, respectively, after seven days. During the algicidal treatment, the concentrations of PC, APC, PE, and MDA and the activities of SOD, POD, and CAT were significantly increased in the early cultivation and declined quickly at later stages. Finally, the algae-lysing mechanism of the bioactive metabolites of the bacteria Brevibacillus laterosporus on Oscillatoria had been proposed.

  3. A Preliminary Study of the Algicidal Mechanism of Bioactive Metabolites of Brevibacillus laterosporus on Oscillatoria in Prawn Ponds

    Directory of Open Access Journals (Sweden)

    Wen Jia

    2014-01-01

    Full Text Available The algae, Oscillatoria, is commonly found in prawn ponds and can lead to reduced productivity. We examined metabolites of the bacteria Brevibacillus laterosporus for algicidal qualities. To determine the possible algicidal mechanisms of these bioactive metabolites, different amounts of sterile filtrate of bacterial suspensions were added to cultures containing Oscillatoria. The dry weight, the concentrations of chlorophyll-a (chl-a, phycobiliprotein (PC, phycocyanin; APC, allophycocyanin; PE, phycoerythrin, and MDA (malondialdehyde and the activities of SOD (superoxide dismutase, POD (peroxidase, and CAT (catalase of algae were measured during the algicidal application. The results showed that lower concentrations of the sterile filtrate (addition ≤ 4 mL accelerated the growth rate of Oscillatoria, but significant inhibition and lysis were observed with higher concentrations (addition ≥ 8 mL. In two trials (the additions were 8 mL and 10 mL, respectively, the algal dry weights were reduced by 26.02% and 45.30%, and the chl-a concentrations were decreased by 46.88% and 63.73%, respectively, after seven days. During the algicidal treatment, the concentrations of PC, APC, PE, and MDA and the activities of SOD, POD, and CAT were significantly increased in the early cultivation and declined quickly at later stages. Finally, the algae-lysing mechanism of the bioactive metabolites of the bacteria Brevibacillus laterosporus on Oscillatoria had been proposed.

  4. La adaptación a la deficiencia de zinc en cianobacterias. Papel de treonil-trna sintetasas duplicadas

    OpenAIRE

    Rubio Gómez, Miguel Ángel

    2016-01-01

    Falta palabras claves Las aminoacil tRNA sintetasas (aaRSs) son las enzimas que catalizan la carga del aminoácido en el tRNA y son las responsables de mantener la fidelidad en la traducción del código genético. Las aaRSs son componentes esenciales de la síntesis proteica y son ubicuas en todos los dominios de la vida (Ibba y Sol, 2000; Perona y Hadd, 2012). La cianobacteria filamentosa Anabaena sp.PCC 7120 contiene dos genes de treonil tRNA sintetasa, alr0335(thrS1) y all4723 (thrS2), ...

  5. Sprectroradiometric characteristics of inland water bodies infestated by Oscillatoria rubescens algae

    Science.gov (United States)

    Ciraolo, Giuseppe; La Loggia, Goffredo; Maltese, Antonino

    2010-10-01

    In December 2006 blooms of Oscillatoria rubescens were found in the reservoir Prizzi in Sicily. Oscillatoria is a genus of filamentous alga comprising approximately 6 species, between these the O. rubescens is sadly famous since this organism produces microcystins which are powerful hepatotoxins. Firstly found in Europe in 1825 on Geneva lake, recently (2006) those algae has been find out in Pozzillo, Nicoletti e Ancipa reservoirs (Enna Province), as well as in Prizzi (Palermo Province) and Garcia reservoirs (Trapani Province). Toxins produced by those bacteria (usually called microcystine LR-1 and LR-2) are highly toxic since they can activate oncogenes cells causing cancer pathologies on liver and gastrointestinal tract. Even if water treatment plants should ensure the provision of safe drinking water from surface waters contaminated with those toxic algae blooms, the contamination of reservoirs used for civil and agricultural supply highlights human health risks. International literature suggests a threshold value of 0.01 μgl-1 to avoid liver cancer using water coming from contaminated water bodies for a long period. Since O. rubescens activities is strongly related to phosphate and nitrogen compounds as well as to temperature and light transmission within water, the paper presents the comparison between optical properties of the water of an infested reservoir and those of a reservoir characterized by clear water. Field campaigns were carried out in February-March 2008 in order to quantify the spectral transparencies of two water bodies through the calculation of the diffuse attenuation coefficient, measuring underwater downwelling irradiance at different depths as well as water spectral reflectance. Results show that diffuse attenuation coefficient is reduced by approximately 15% reducing light penetration in the water column; coherently reflectance spectral signature generally decreases, exhibiting a characteristic peak around 703 nm not present in

  6. 18 CFR 1304.404 - Commercial marina harbor limits.

    Science.gov (United States)

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Commercial marina... ALTERATIONS Miscellaneous § 1304.404 Commercial marina harbor limits. The landward limits of commercial marina... of harbors at commercial marinas will be designated by TVA on the basis of the size and extent...

  7. 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...

  8. Nuevas funciones de las proteínas Fur en cianobacterias: Contribución a la definición del regulón FurA en Anabaena sp. PCC 7120

    OpenAIRE

    González Rodríguez, Andrés; Fillat Castejón, María Francisca

    2013-01-01

    En el presente trabajo de tesis nos propusimos avanzar en el conocimiento de la funciones de las proteínas Fur en cianobacterias mediante el estudio del regulón FurA de la cianobacteria filamentosa formadora de heterocistos Anabaena sp. PCC 7120. Como herramienta de trabajo para el estudio del regulón construimos una estirpe de sobreexpresión de FurA en Anabaena sp. PCC 7120, empleando un vector lanzadera con orígenes de replicación en E. coli y Anabaena sp. que logró incrementar hasta ~32 ve...

  9. Uso del modelado de nicho ecológico como una herramienta para predecir la distribución potencial de Microcystis sp (cianobacteria) en la Presa Hidroeléctrica de Aguamilpa, Nayarit, México

    OpenAIRE

    José L. Ibarra-Montoya; Gabriel Rangel-Peraza; Fernando A. González-Farias; José de Anda; Enrique Martínez-Meyer; Humberto Macias-Cuellar

    2012-01-01

    El modelado de nicho ecológico es una herramienta importante para la evaluación de la distribución espacial de especies terrestres, sin embargo, su aplicabilidad ha sido poco explorada en el medio acuático. Microcystis sp., es una especie de cianobacteria con frecuencia conocida por la producción de toxinas del tipo microcistinas, cuya ingestión en altas concentraciones ocasiona la muerte de animales, desde pequeñas aves hasta el ganado. Como cualquier grupo taxonómico, ésta cianobacteria pre...

  10. Using oxidized liquid and solid human waste as nutrients for Chlorella vulgaris and cyanobacterium Oscillatoria deflexa

    Science.gov (United States)

    Trifonov, Sergey V.; Kalacheva, Galina; Tirranen, Lyalya; Gribovskaya, Iliada

    At stationary terrestrial and space stations with closed and partially closed substance exchange not only plants, but also algae can regenerate atmosphere. Their biomass can be used for feeding Daphnia and Moina species, which, in their turn, serve as food for fish. In addition, it is possible to use algae for production of biological fuel. We suggested two methods of human waste mineralization: dry (evaporation with subsequent incineration in a muffle furnace) and wet (oxidation in a reactor using hydrogen peroxide). The research task was to prepare nutrient media for green alga Chlorella vulgaris and cyanobacterium Oscillatoria deflexa using liquid human waste mineralized by dry method, and to prepare media for chlorella on the basis of 1) liquid and 2) liquid and solid human waste mineralized by wet method. The algae were grown in batch culture in a climate chamber with the following parameters: illumination 7 klx, temperature 27-30 (°) C, culture density 1-2 g/l of dry weight. The control for chlorella was Tamiya medium, pH-5, and for oscillstoria — Zarrouk medium, pH-10. Maximum permissible concentrations of NaCl, Cl, urea (NH _{2}) _{2}CO, and native urine were established for algae. Missing ingredients (such as salts and acids) for experimental nutrient media were determined: their addition made it possible to obtain the biomass production not less than that in the control. The estimation was given of the mineral and biochemical composition of algae grown on experimental media. Microbiological test revealed absence of foreign microbial flora in experimental cultures.

  11. Aproximación genético-bioquímica al estudio de la asimilación de nitrato en la cianobacteria "Anacystis nidulans R2"

    OpenAIRE

    Madueño Albi, Francisco

    1987-01-01

    Tras mutagénesis con transposón se han aislado 19 estirpes de la Cianobacteria Anacystis nidulans R2 incapaces de crecer en medio con nitrato como única fuente de nitrógeno. Se distinguen tres diferentes fenotipos en relación a la a ... ctividad de las enzimas implicadas en la reducción del nitrato. La estirpe FM16 muestra tanto actividad nitrato reductasa como actividad nitrito reductasa FM2 carece de la actividad nitrito reductasa y las restantes 16 estirpes carecen de la actividad nitrat...

  12. Aplicación de la cianobacteria Spirulina sp. en la remoción y recuperación del colorante rojo congo de muestras acuosas.

    OpenAIRE

    MADRIGALES UBALDO, J.R.; SÁENZ-TAVERA, I.C.; LIÑÁN MONTES, ADRIANA; SOTO REGALADO, E.; CERINO CÓRDOVA, F.; GARCÍA REYNAR, R.B.; GARZA GONZÁLEZ, MA. TERESA

    2011-01-01

    En este trabajo se utilizó la biomasa de Cianobacteria Spirulina sp. en un sistema Bach, para remover el colorante ácido Rojo Congo (RC). Se estudió el efecto de variables de operación tales como dosis de biomasa. tiempo de contacto pH inicial y temperatura. Las mejores condiciones de operación para la remoción de Re fueron: dosis de biomasa de 1 gIL, pH 2, temperatura de 25 oC y tiempo de contacto de 2 horas. Los datos experimentales del equilibrio de biosorción se ajus1aron mejor al modelo ...

  13. Patrimonio Natural y Reservas Marinas

    Directory of Open Access Journals (Sweden)

    Raquel de la Cruz Modino

    2004-01-01

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

  14. Nitrogen limitation in natural populations of cyanobacteria (Spirulina and Oscillatoria spp.) and its effect on macromolecular synthesis

    International Nuclear Information System (INIS)

    Natural populations of the cyanobacteria Spirulina species and Oscillatoria species obtained from Israeli fish ponds were limited in growth by nitrogen availability in summer. Physiological indicators for nitrogen limitation, such as phycocyanin, chlorophyll a, and carbohydrate content, did not show clear evidence for nitrogen limited growth, since these organisms are capable of vertical migration from and to the nitrogen-rich bottom. By means of 14C labeling of the cells under simulated pond conditions followed by cell fractionation into macromolecular compounds, it was found that carbohydrates synthesized at the lighted surface were partially utilized for dark protein synthesis at the bottom of these ponds

  15. 33 CFR 80.1124 - Ventura Marina, CA.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Ventura Marina, CA. 80.1124 Section 80.1124 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY INTERNATIONAL NAVIGATION RULES COLREGS DEMARCATION LINES Pacific Coast § 80.1124 Ventura Marina, CA. A line drawn from Ventura Marina South Jetty Light 6...

  16. 33 CFR 80.1118 - Marina Del Rey, CA.

    Science.gov (United States)

    2010-07-01

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

  17. Esteróles en esponjas marinas

    Directory of Open Access Journals (Sweden)

    Carmenza Duque

    2009-07-01

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

  18. Vigilancia sanitaria de cianobacterias en aguas de consumo humano y aguas de baño Health surveys of cyanobacteria in drinking and recreational waters

    Directory of Open Access Journals (Sweden)

    Guadalupe Martínez Juárez

    2008-06-01

    Full Text Available Las autoridades de Salud Pública tienen implantados y consolidados programas de vigilancia sanitaria de aguas de consumo humano y aguas de baño, cuya finalidad es evitar riesgos para la salud de la población que consume agua o que utiliza con fines recreativos zonas de baño continentales. A la luz de los conocimientos científicos actuales, la proliferación de cianobacterias es un nuevo riesgo, que es necesario tener en cuenta en los programas de protección de la salud. En el presente trabajo, cuyo principal objetivo es conocer la presencia de cianobacterias y microcistinas en aguas utilizadas para consumo humano y baño, se muestran los resultados obtenidos en los programas de vigilancia llevados a cabo en el Área de Salud de Talavera de la Reina en los últimos cuatro años. Se ha realizado un estudio descriptivo de la presencia de cianobacterias y microcistinas, en agua bruta de la captación de dos embalses y en agua tratada a la salida de dos plantas de tratamiento de agua potable. Esto mismo se ha estudiado en otros dos embalses utilizados para baño en época estival. Para ello se han efectuado muestreos quincenales y posterior identificación y recuento de cianobacterias y determinación de microcistinas disueltas en agua mediante técnica ELISA. De los resultados de la vigilancia de aguas de consumo humano, se concluye que los valores de microcistinas detectados en los embalses no son elevados, apareciendo en menos del 6% de los muestreos efectuados y que el tratamiento aplicado en las plantas de tratamiento de agua potable, es eficaz para su eliminación. De la vigilancia de cianobacterias en el agua de baño, se concluye que a lo largo de tres temporadas, en el 48% de los muestreos realizados en las dos zonas de baño del área, se han superado las 100.000 células/ml, valor guía dado por la OMS, para valorar probabilidad moderada de efectos adversos en bañistas. Destacar que es necesario disponer de datos sobre exposición a

  19. Effects of food type on the life history of Daphnia clones from lakes differing in trophic state. I. Daphnia galeata feeding on Scenedesmus and Oscillatoria

    NARCIS (Netherlands)

    Repka, S.

    1997-01-01

    1. Effects of the green alga Scenedesmus obliquus and the filamentous cyanobacterium Oscillatoria limnetica as food sources on the growth and reproduction of nine Daphnia galeata clones were studied. A high concentration of these two algae species was fed to Daphnia clones collected from four lakes

  20. Photosynthetic and Behavioral Versatility of the Cyanobacterium Oscillatoria-Boryana in a Sulfide-Rich Microbial Mat

    DEFF Research Database (Denmark)

    CASTENHOLZ, RW; JØRGENSEN, BB; DAMELIO, E.;

    1991-01-01

    with dense O. boryana populations were used to make vertical profiles at intervals of 0.1-0.2 mm and also to estimate rates of oxygenic and anoxygenic photosynthesis during rapid light-dark transitions. In addition, attenuation of irradiance was measured in mats with O. boryana by a spectroradiometer...... resulted in a downward retreat. The result was a lowered irradiance level for the Oscillatoria but, nevertheless, a high rate of oxygenic photosynthesis. O. boryana is a versatile cyanobacterium that appears to avoid photoinhibitory conditions and to optimize its light intensity for photosynthesis...... with mini-fiber optic probe. Light-dependent incorporation of [C-14]-bicarbonate and [C-14]-acetate was measured in collected field populations of O. boryana. The combined results led to the conclusion that populations of O. boryana typically employed sulfide-dependent anoxygenic photosynthesis in early...

  1. 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...

  2. 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.

  3. 33 CFR 110.111 - Marina del Rey Harbor, Calif.

    Science.gov (United States)

    2010-07-01

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

  4. Contaminación marina en el Perú.

    OpenAIRE

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

    1980-01-01

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

  5. 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

  6. 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

  7. Role of Light Intensity and Temperature in the Regulation of Hydrogen Photoproduction by the Marine Cyanobacterium Oscillatoria sp. Strain Miami BG7

    OpenAIRE

    Phlips, E. J.; Mitsui, A

    1983-01-01

    The effects of several key environmental factors on the development and control of hydrogen production in the marine blue-green alga (cyanobacterium) Oscillatoria sp. strain Miami BG7 were studied in relation to the potential application of this strain to a bio-solar energy technology. The production of cellular biomass capable of evolving hydrogen gas was strongly affected by light intensity, temperature, and the input of ammonia as a nutrient. Depletion of combined nitrogen from the growth ...

  8. 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...

  9. 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, ...

  10. Cianobacterias y cianotoxinas: necesidad de su control en el agua de consumo humano Cyanobacteria and cyanotoxins: need for their control in water for human consumption

    Directory of Open Access Journals (Sweden)

    Ana Isabel Prieto Ortega

    2005-12-01

    Full Text Available Las floraciones de cianobacterias se están convirtiendo en un importante problema en la calidad del agua en muchos países del mundo, debido a la producción de cianotoxinas, con actividad hepatotóxica y neurotóxica, que las convierten en un riesgo para la salud. Entre ellas, las microcistinas (MC son las toxinas más frecuentemente detectadas en aguas superficiales. En este trabajo revisamos de forma sucinta los posibles riesgos tóxicos derivados de la exposición a MC, fundamentalmente por consumo de aguas contaminadas, lo que justifica en definitiva la necesidad de llevar a cabo programas de monitorización y control de las mismas.Cyanobacterial waterblooms are becoming an important water quality problem in many countries in the world, as a result of its hepatotoxic and neurotoxic cyanotoxins production, which make these toxins a health risk. Microcystins (MC are the most frequent cyanotoxins detected on superficial freshwaters. In the present work, toxic risks derived from exposure to MC have been revised, mainly due to the consumption of contaminated waters. This fact makes necessary to perform control and monitoring programs.

  11. Proyecto integral Marina del Sol S.A.

    Directory of Open Access Journals (Sweden)

    Alfredo Palacios Barra

    2015-03-01

    Full Text Available El megaproyecto Marina del Sol del Gran Concepción, se emplaza en el sector del canal Ifarle a espaldas del Aeropuerto Carriel Sur en la comuna de Talcahuano. Recientemente entró a funcionar el Casino Marina del Sol, el que está inscrito en el marco de los 15 proyectos autorizados en el 2006 por la Superintendencia de Juego que buscan promover el desarrollo de este sector a nivel del país.

  12. 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...

  13. 75 FR 1110 - Culturally Significant Objects Imported for Exhibition Determinations: “Marina Abramovic: The...

    Science.gov (United States)

    2010-01-08

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF STATE Culturally Significant Objects Imported for Exhibition Determinations: ``Marina Abramovic: The Artist Is... hereby determine that the objects to be included in the exhibition ``Marina Abramovic: The Artist...

  14. 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.

  15. 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.

  16. 77 FR 21868 - Safety Zone; Marina Salvage, Bellingham Bay, Bellingham, WA

    Science.gov (United States)

    2012-04-12

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Marina Salvage, Bellingham Bay, Bellingham... safety zone in and around the Squalicum Harbor Marina, located in Bellingham, WA. This action is... by a marina fire, which produced sunken vessels, and requires emergency salvage operations. Under 5...

  17. 75 FR 4783 - Federal Consistency Appeal by Villa Marina Yacht Harbour, Inc.

    Science.gov (United States)

    2010-01-29

    ..., 2009. See 74 FR 42,650. Under the CZMA, the Secretary must close the decision record in an appeal 160... National Oceanic and Atmospheric Administration Federal Consistency Appeal by Villa Marina Yacht Harbour... record in an administrative appeal filed by Villa Marina Yacht Harbour, Inc. (Villa Marina). DATES:...

  18. 76 FR 38020 - Safety Zone; Bay Point Fireworks, Bay Point Marina; Marblehead, OH

    Science.gov (United States)

    2011-06-29

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Bay Point Fireworks, Bay Point Marina... transit or anchor in a portion of the Lake Erie, Bay Point Marina; Marblehead, OH between 10 p.m. and 10... Zone; Bay Point Fireworks, Bay Point Marina; Marblehead, OH. (a) Location. The following area is...

  19. 77 FR 37604 - Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA

    Science.gov (United States)

    2012-06-22

    ... SECURITY Coast Guard 33 CFR Part 165 Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA... enforce the safety zone for the Berkeley Marina Fourth of July Fireworks display in the Captain of the... Marina Fourth of July Fireworks display in 33 CFR 165.1191. This safety zone will be in effect from...

  20. 76 FR 37650 - Safety Zone; 4th of July Festival Berkeley Marina Fireworks Display Berkeley, CA

    Science.gov (United States)

    2011-06-28

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

  1. 78 FR 29022 - Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA

    Science.gov (United States)

    2013-05-17

    ... SECURITY Coast Guard 33 CFR Part 165 Safety Zone; Fourth of July Fireworks, Berkeley Marina, Berkeley, CA... enforce the safety zone for the Berkeley Marina Fourth of July Fireworks display in the Captain of the...'19'' W (NAD 83) for the Berkeley Marina Fourth of July Fireworks display listed in 33 CFR...

  2. 76 FR 18391 - Safety Zone; Texas International Boat Show Power Boat Races; Corpus Christi Marina, Corpus...

    Science.gov (United States)

    2011-04-04

    ... Races; Corpus Christi Marina, Corpus Christi, TX AGENCY: Coast Guard, DHS. ACTION: Temporary final rule... public and boating traffic in the Corpus Christi Marina area during this event. This safety zone is intended to restrict vessel traffic from a portion of the Corpus Christi Marina for short durations of...

  3. 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.

  4. Belliella marina sp. nov., isolated from seawater.

    Science.gov (United States)

    Song, Lei; Liu, Hongcan; Wang, Jian; Huang, Ying; Dai, Xin; Han, Xiqiu; Zhou, Yuguang

    2015-12-01

    Gram-stain-negative, rod-shaped bacterium, strain SW112T, was isolated from a seawater sample collected from the Indian Ocean. The strain was strictly aerobic and catalase- and oxidase-positive. Strain SW112T grew at 4-42 °C (optimum 30 °C), at pH 5.5-9.5 (optimum pH 7.5) and in the presence of 0-9.0 % (w/v) NaCl (optimum 2.0-3.0 %). The predominant cellular fatty acids were iso-C15 : 0 (29.7 %), iso-C17 : 03-OH (14.3 %) and summed feature 3 (comprising C16 : 1ω7c and/or C16 : 1ω6c, 15.1 %). The major menaquinone was menaquinone-7 and the major polar lipid was phosphatidylethanolamine. The genomic DNA G+C content of strain SW112T was 39 mol%. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain SW112T was related to members of the genus Belliella, showing the highest similarity with Belliella aquatica TS-T86T and Belliella baltica DSM 15883T (96.5 % and 96.4 %sequence similarity, respectively). On the basis of phylogenetic inference and phenotypic characteristics, it is proposed that strain SW112T represents a novel species of the genus Belliella, for which the name Belliella marina sp. nov. is proposed. The type strain is SW112T(=CGMCC 1.15180T=KCTC 33694T). PMID:26346194

  5. 感性的人形师——Marina Bychkova

    Institute of Scientific and Technical Information of China (English)

    王玥秀

    2015-01-01

    文章介绍了一位综合型艺术家Marina Bychkova。自Marina 6岁那年看过一张瓷娃娃的照片开始,创作人偶就成了她的终生追求。Marina依靠自己深厚的艺术功底和精湛的制作技术创造出了自己理想中的人偶"Enchanted Doll",成为了世界知名的人形师。

  6. 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 ...

  7. 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

  8. 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)

  9. 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

  10. 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...

  11. 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...

  12. A New Acylated Iridoid Glucoside from Avicennia marina

    Institute of Scientific and Technical Information of China (English)

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

    2006-01-01

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

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

    DEFF Research Database (Denmark)

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

    2014-01-01

    Salinity is one of the main factors impacting distribution of marine plants and sub-optimal salinities may result in increased resource use and decreased production.We studied the performance and salinity tolerance of eelgrass (Zostera marina L.) originating from two regions with different ambient...... can severely impact seagrass productivity but responses might vary significantly depending on plant origin. Such variability in stress tolerance indicates that some populations have better chances to survive in and adapt to future changes in environment....

  14. 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...

  15. Fragility of Floating Docks for Small Craft Marinas

    Science.gov (United States)

    Keen, A.; Eskijian, M.; Lynett, P. J.; Ayca, A.

    2015-12-01

    Because of the damage resulting from the 2010 Chile and 2011 Japanese tele-tsunamis, damage to the small craft marinas in California has become an important concern. This paper will explain the methodology and results used to simulate the demand and also the structural capacity of the floating dock system, composed of floating docks, fingers and moored vessels during tsunami events. The intent is to develop a predictive tool to understand the vulnerability of California's small craft harbors to tsunami events. To validate the methodology, the probabilistic model will be applied to Santa Cruz Harbor. Maps of maximum velocity and mean current direction from the 2011 Japan tsunami have been developed using a numerical model. Cleat and pile guide locations will be recorded and georeferenced from aerial images before the event. The fragility curves for each dock/finger system will be compared with damage reports and aerial images from just after the tsunami event. A discussion of how the fragility curves compare with the damage reports will be included. It is anticipated that these curves will be useful to marina operators to use as a tool to determine where rehabilitation might be necessary to mitigate some of the damage from the next event. Conclusions will focus on how results can be used by marina operators to reduce harbor vulnerability to tsunamis.

  16. Optimum conditions for growth in liquid medium of Oscillatoria formosa Bory used as the principal food in laboratory culture of intermediate hosts for schistosomosis and fasciolosis

    Directory of Open Access Journals (Sweden)

    Ferreira Filipa M.

    2000-09-01

    Full Text Available The rearing of snails, intermediate hosts of Schistosoma haematobium, S. intercalatum, S. bovis and Fasciola hepatica is the first step to maintain the life cycle of these parasites in laboratory in order to have biological material for the different studies, namely on the systematic biology and immunodiagnostic of schistosomosis and fasciolosis. According to the traditional method, the alga Oscillatoria formosa Bory (Cyanobacteria, principal food source for the snails, was cultivated in soil extract (Sampaio Xavier et al., 1968. However, it was sometimes very difficult to find the proper soil extract and the material was also contaminated by protozoa and fungi. In our work, using a new medium having as a base the Mineral Medium II (modified from Hughes et al., 1958 we found that O. formosa had a better growth response than in the soil extract medium. Snails fed on O. formosa reached three times the size of others at the same age, and they also reached sex maturity earlier, having more egg-masses per snail and, in addition, the rate of survival as well as the number of generations per year under laboratory conditions significantly increased. This culture was also easier to perform, and the axenic conditions easier to maintain.

  17. 18 CFR 1304.403 - Marina sewage pump-out stations and holding tanks.

    Science.gov (United States)

    2010-04-01

    ... 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 TENNESSEE... OTHER ALTERATIONS Miscellaneous § 1304.403 Marina sewage pump-out stations and holding tanks. All...

  18. Cultivos discontinuos alimentados con urea de la cianobacteria Phormidium sp. en función de la salinidad y edad del cultivo

    Directory of Open Access Journals (Sweden)

    Lorena del valle Jonte Gómez

    2013-12-01

    Full Text Available Título en ingles: Urea fed-batch cultures of the cyanobacterium  Phormidium sp. as a function of the salinity and age of cultures Título corto: Cultivos discontinuos alimentados de Phormidium sp.Resumen: Se  Se comparó la eficiencia de sistemas de cultivos discontinuos alimentados versus cultivos discontinuos convencionales, en cuanto a concentración de nitrógeno, adicionando 0,2 mM de urea cada tres días al final de la fase exponencial, durante 21 días. Se realizaron cultivos con un volumen de 1500 mL a 15 y 35 UPS de salinidad, enriquecidos con medio ALGAL 8mM NaNO3, a 238 mmol q m-2 s-1, aireación constante, fotoperiodo 12:12 horas y temperatura de 29 ±3ºC. Phormidium sp. posee la capacidad de hidrolizar la urea; mostrando una asimilación de 65±7,07% de la misma, con la mayor producción (p´<´0,05 de clorofila a, ficocianina y proteínas de 20,26±1,24; 203,47±12,83 y 707,87±28,47 µg mL-1en los cultivos alimentados. La producción de pigmentos vario en el tiempo, independientemente a la salinidad y sistema de cultivo, mientras que la producción de proteínas y carbohidratos totales fue directamente proporcional a la edad del cultivo, con valores máximos de 612,74±5,41 µg mL-1 y 8,96±0,08 mg mL-1 respectivamente a los 31 días. La síntesis de lípidos y EPS fueron influenciadas (p´<´0,05 por la salinidad, presentando los máximos de lípidos a 15 UPS con 12,22±2,91mg mL-1, y los EPS se incrementaron a 35 UPS con 2,00±0,26 y 2,03±0,15 mg mL-1. Estos resultados determinan que los cultivos de Phormidium sp. alimentados con urea y a salinidades de 15 y 35 UPS, representan una alternativa económica para la producción de clorofila a, ficocianina y proteínas, incrementándose un 31,04; 40,72 y 31,94 % respectivamente en comparación con cultivos no alimentados.Palabras clave: clorofila, ficocianina, proteínas, cianobacteria, urea.Abstract: Fed-batch system efficiency versus batch cultures was compared in relation

  19. 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...... 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....

  20. 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...

  1. 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.

  2. 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.

  3. 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.

  4. 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

  5. Photosynthetic Versatility in the Genome of Geitlerinema sp. PCC 9228 (Formerly Oscillatoria limnetica ‘Solar Lake’), a Model Anoxygenic Photosynthetic Cyanobacterium

    Science.gov (United States)

    Grim, Sharon L.; Dick, Gregory J.

    2016-01-01

    Anoxygenic cyanobacteria that use sulfide as the electron donor for photosynthesis are a potentially influential but poorly constrained force on Earth’s biogeochemistry. Their versatile metabolism may have boosted primary production and nitrogen cycling in euxinic coastal margins in the Proterozoic. In addition, they represent a biological mechanism for limiting the accumulation of atmospheric oxygen, especially before the Great Oxidation Event and in the low-oxygen conditions of the Proterozoic. In this study, we describe the draft genome sequence of Geitlerinema sp. PCC 9228, formerly Oscillatoria limnetica ‘Solar Lake’, a mat-forming diazotrophic cyanobacterium that can switch between oxygenic photosynthesis and sulfide-based anoxygenic photosynthesis (AP). Geitlerinema possesses three variants of psbA, which encodes protein D1, a core component of the photosystem II reaction center. Phylogenetic analyses indicate that one variant is closely affiliated with cyanobacterial psbA genes that code for a D1 protein used for oxygen-sensitive processes. Another version is phylogenetically similar to cyanobacterial psbA genes that encode D1 proteins used under microaerobic conditions, and the third variant may be cued to high light and/or elevated oxygen concentrations. Geitlerinema has the canonical gene for sulfide quinone reductase (SQR) used in cyanobacterial AP and a putative transcriptional regulatory gene in the same operon. Another operon with a second, distinct sqr and regulatory gene is present, and is phylogenetically related to sqr genes used for high sulfide concentrations. The genome has a comprehensive nif gene suite for nitrogen fixation, supporting previous observations of nitrogenase activity. Geitlerinema possesses a bidirectional hydrogenase rather than the uptake hydrogenase typically used by cyanobacteria in diazotrophy. Overall, the genome sequence of Geitlerinema sp. PCC 9228 highlights potential cyanobacterial strategies to cope with

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

    DEFF Research Database (Denmark)

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

    2016-01-01

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

  7. 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)

  8. 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...

  9. 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

  10. 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...

  11. 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.

  12. 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.

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

    Science.gov (United States)

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

    2016-09-01

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

  14. Efectos del fitoplancton tóxico procedente de aguas continentales y marinas en ecosistemas salobres de estuario

    OpenAIRE

    Ors de Blas, Ana D'

    2015-01-01

    El papel del fitoplancton marino y continental como productor primario, fijador de nutrientes y base de las redes tróficas ha sido ampliamente reconocido y estudiado, aunque existe mucha menos información sobre su rol como vector de toxicidad en los ecosistemas. Las cianobacterias, dinoflagelados o diatomeas productores de toxinas suelen cobrar relevancia en eventos no cíclicos, con consecuencias ecológicas, económicas y sociales, en el ambiente en el que aparezcan (blooms y mareas rojas). ...

  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. 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.

  17. 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

  18. 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.

  19. 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

  20. Isoflurane, sevoflurane and desflurane use in cane toads (Rhinella marina).

    Science.gov (United States)

    Morrison, Kaleigh E; Strahl-Heldreth, Danielle; Clark-Price, Stuart C

    2016-01-01

    Anaesthetic chamber concentrations of isoflurane, sevoflurane and desflurane that resulted in loss of righting reflex within 15 minutes in 50 per cent of toads (Rhinella marina) exposed (ED50-LRR<15MIN) were identified. The median and range ED50-LRR<15MIN was 1.4 (0.9-1.4) per cent for isoflurane, 1.75 (1.1-1.9) per cent for sevoflurane and 4.4 (4.3-5.5) per cent for desflurane. Subsequently, toads were exposed to 1.5 times the ED50-LRR<15MIN and times to loss and return of righting reflex were identified. All toads for all anaesthetics lost righting reflex. The median and range loss of righting reflex was 4:00 (3:00-5:30) minutes for isoflurane, 4:45 (3:30-7:00) minutes for sevoflurane, and 4:15 (4:00-5:30) minutes for desflurane and was not different between anaesthetics. Time to return of righting reflex was 175 (123-211) minutes for isoflurane, 192 (116-383) minutes for sevoflurane and 74 (52-220) minutes for desflurane. Time to return of righting reflex was significantly shorter for desflurane compared with isoflurane or sevoflurane. The use of isoflurane, sevoflurane or desflurane can be used to provide immobilisation to cane toads and potentially other anurans. Induction times are likely similar when using an anaesthetic chamber to provide anaesthesia. However recovery time may take twice as long when utilising isoflurane or sevoflurane over desflurane. PMID:27651914

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

    Science.gov (United States)

    Furman, Bradley T; Peterson, Bradley J

    2015-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Bradley T Furman

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

  3. 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.

  4. 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

    of 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 dynamics....... marina appear to represent a general difference between the isoetid species mainly inhabiting sediments of low reducing capacity of oligotrophic lakes and the elodeid freshwater species and marine seagrasses mainly inhabiting sediments of higher reducing capacity in more nutrient-rich habitats....

  5. 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

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

    Science.gov (United States)

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

    2013-01-01

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

  7. 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

  8. 78 FR 45061 - Safety Zone; Sister Bay Marina Fest Fireworks and Ski Show, Sister Bay, WI

    Science.gov (United States)

    2013-07-26

    ... Department of Homeland Security FR Federal Register NPRM Notice of Proposed Rulemaking TFR Temporary Final... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Sister Bay Marina Fest Fireworks and Ski... intended to restrict vessels from a portion of Sister Bay due to a fireworks display and ski show....

  9. 33 CFR 162.200 - Marina del Rey, Calif.; restricted area.

    Science.gov (United States)

    2010-07-01

    ... dealing with this section in 33 CFR Part 207. ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Marina del Rey, Calif... SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY INLAND WATERWAYS NAVIGATION REGULATIONS § 162.200...

  10. Marina Kaljurand: Valge Maja annab volikirja südamlikumalt kui Kreml / intervjueerinud Jaanus Piirsalu

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2011-01-01

    Eesti uus suursaadik USAs Marina Kaljurand Eesti ja Ameerika Ühendriikide koostöövõimalustest. Juttu on ka president Toomas Hendrik Ilvese kohtumistest USA presidendiga. Ilmunud ka ajalehes Vaba Eesti Sõna, 8. sept. 2011, lk. 3, 14, 15

  11. 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 th...

  12. 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.

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

    NARCIS (Netherlands)

    Harrison, P.G.

    1991-01-01

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

  14. 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.

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

    DEFF Research Database (Denmark)

    Stæhr, Peter A.; Borum, Jens

    2011-01-01

    rates, especially so for cold acclimated plants in February (36% higher Q10-values). These changes were accompanied by a reduction in chlorophyll a and nitrogen concentrations in leaves by 35% and 60% respectively from February to August. The critical light requirement (EC) of Z. marina to maintain...

  16. Antibiofilm activity of Cobetia marina filtrate upon Staphylococcus epidermidis catheter-related isolates

    OpenAIRE

    Trentin, D.S.; Gorziza, D. F.; Abraham, W. R.; Antunes, A.L.S.; Lerner, C.; Mothes, B.; Termignoni, C.; A.J Macedo

    2011-01-01

    We report the antibiofilm activity by the sponge-associated bacterium Cobetia marina upon Staphylococcus epidermidis clinical isolates obtained from central venous catheters. Antibiofilm activity/antimicrobial susceptibility correlation might predict the action of the metabolite(s) upon Staphylococcus epidermidis in the clinic, making it a possible adjuvant in therapies against biofilm-associated infections.

  17. Antibiofilm activity of Cobetia marina filtrate upon Staphylococcus epidermidis catheter-related isolates

    Directory of Open Access Journals (Sweden)

    D.S Trentin

    2011-12-01

    Full Text Available We report the antibiofilm activity by the sponge-associated bacterium Cobetia marina upon Staphylococcus epidermidis clinical isolates obtained from central venous catheters. Antibiofilm activity/antimicrobial susceptibility correlation might predict the action of the metabolite(s upon Staphylococcus epidermidis in the clinic, making it a possible adjuvant in therapies against biofilm-associated infections.

  18. 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

  19. 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.

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

    Science.gov (United States)

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

    2016-04-18

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

  1. 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.

  2. 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.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2009-04-02

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

  4. In Situ Carbon Stable Isotope Tracer Experiments Elucidate Carbon Translocation Rates and Allocation Patterns in Zostera marina L. (eelgrass)

    Science.gov (United States)

    The intertidal seagrass Zostera marina is an important species that provides critical habitat for a number of estuarine species. Despite its widespread distribution, there is limited information on seasonal patterns of carbon dynamics of plants growing in situ, particularly esti...

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

    Science.gov (United States)

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

  6. 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).

  7. 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.

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

    Science.gov (United States)

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

    2016-01-01

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

  9. 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

  10. Research Progress of Removal of Oscillatoria Tenuis by Pre-oxidation and Chemical Coagulation%预氧化与化学混凝联合去除颤藻的研究进展

    Institute of Scientific and Technical Information of China (English)

    李引

    2012-01-01

    It was a worldwide environment problem that the eutrophication of fresh waters became more serious.In drinking water supplies with conventional process,algae and its by-product can cause many influences of negative so that it is difficult to get rid of them.The research on the coagulation removal of Oscillatoria tenuis by pre-oxidation with Kaolin at home was summerized.Meanwhile,removal efficiency and limitation of different methods were analyzed systematically and some scientific tendencies were prospected.Issues were put forward to facilitate study and further improve and perfect the application.%日趋严重的水体富营养化早已成为全球性的环境问题,藻类及其副产物给传统除藻工艺带来了很多不利影响,增加了水处理难度。本文对国内预氧化与化学混凝联合去除颤藻的研究和应用动态进行了概括总结,并系统分析各技术去除效果、局限性,展望了颤藻去除技术发展前景。同时也提出了存在的一些问题,便于今后的研究和应用中进一步改进和完善。

  11. 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.

  12. 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

  13. 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...

  14. 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.

  15. 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.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2008-03-15

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

  18. 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.

  19. 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

  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. 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

  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...

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

    Science.gov (United States)

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

  4. 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

  5. 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.

  6. 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

  7. 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.

  8. 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...

  9. 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...

  10. 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.

  11. 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...

  12. 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.

  13. 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...

  14. 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 ...

  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. 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

  17. 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.

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

    Science.gov (United States)

    Balakrishnan, Srinivasan; Srinivasan, Muthukumarasamy; Mohanraj, Jeyaraj

    2016-09-01

    To identify the larvicidal activities of silver nanoparticles synthesised with Avicennia marina leaf extract against the larvae of Aedes aegypti and Anopheleus stephensi, in vitro larvicidal activities such as LC50 and LC90 were assessed. Further, characterisation such as UV and FTIR analysis were carried out for the synthesised silver nanoparticles. The LC50 value of the synthesised silver nanoparticles was identified as 4.374 and 7.406 mg/L for An. stephensi and Ae. aegypti larvae respectively. Further, the LC90 values are also identified as 4.928 and 9.865 mg/L for An. stephensi and Ae. aegypti species respectively. The synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 nm. The FTIR data showed prominent peaks in (3940.57, 3929.00, 3803.63, 3712.97, 2918.30, 2231.64, 1610.50, 1377.17, 1257.59, 1041.59, 1041.56, 775.38, 667.37 and 503.21) different ranges. The biosynthesis of silver nanoparticles with leaf aqueous extract of A. marina provides potential source for the larvicidal activity against mosquito borne diseases. The present study proved the mosquitocidal properties of silver nanoparticles synthesised from mangroves of Vellar estuary. This is an ideal eco-friendly approach for the vector control programs. PMID:27605825

  19. 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.

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

    Science.gov (United States)

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

    2015-04-01

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

  1. 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.

  2. 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.

  3. 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.

  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. 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.

  6. 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.

  7. A biliverdin-binding cyanobacteriochrome from the chlorophyll d–bearing cyanobacterium Acaryochloris marina

    Science.gov (United States)

    Narikawa, Rei; Nakajima, Takahiro; Aono, Yuki; Fushimi, Keiji; Enomoto, Gen; Ni-Ni-Win; Itoh, Shigeru; Sato, Moritoshi; Ikeuchi, Masahiko

    2015-01-01

    Cyanobacteriochromes (CBCRs) are linear tetrapyrrole-binding photoreceptors in cyanobacteria that absorb visible and near-ultraviolet light. CBCRs are divided into two types based on the type of chromophore they contain: phycocyanobilin (PCB) or phycoviolobilin (PVB). PCB-binding CBCRs reversibly photoconvert at relatively long wavelengths, i.e., the blue-to-red region, whereas PVB-binding CBCRs reversibly photoconvert at shorter wavelengths, i.e., the near-ultraviolet to green region. Notably, prior to this report, CBCRs containing biliverdin (BV), which absorbs at longer wavelengths than do PCB and PVB, have not been found. Herein, we report that the typical red/green CBCR AM1_1557 from the chlorophyll d–bearing cyanobacterium Acaryochloris marina can bind BV almost comparable to PCB. This BV-bound holoprotein reversibly photoconverts between a far red light–absorbing form (Pfr, λmax = 697 nm) and an orange light–absorbing form (Po, λmax = 622 nm). At room temperature, Pfr fluoresces with a maximum at 730 nm. These spectral features are red-shifted by 48~77 nm compared with those of the PCB-bound domain. Because the absorbance of chlorophyll d is red-shifted compared with that of chlorophyll a, the BV-bound AM1_1557 may be a physiologically relevant feature of A. marina and is potentially useful as an optogenetic switch and/or fluorescence imager. PMID:25609645

  8. A biliverdin-binding cyanobacteriochrome from the chlorophyll d-bearing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Narikawa, Rei; Nakajima, Takahiro; Aono, Yuki; Fushimi, Keiji; Enomoto, Gen; Ni-Ni-Win; Itoh, Shigeru; Sato, Moritoshi; Ikeuchi, Masahiko

    2015-01-01

    Cyanobacteriochromes (CBCRs) are linear tetrapyrrole-binding photoreceptors in cyanobacteria that absorb visible and near-ultraviolet light. CBCRs are divided into two types based on the type of chromophore they contain: phycocyanobilin (PCB) or phycoviolobilin (PVB). PCB-binding CBCRs reversibly photoconvert at relatively long wavelengths, i.e., the blue-to-red region, whereas PVB-binding CBCRs reversibly photoconvert at shorter wavelengths, i.e., the near-ultraviolet to green region. Notably, prior to this report, CBCRs containing biliverdin (BV), which absorbs at longer wavelengths than do PCB and PVB, have not been found. Herein, we report that the typical red/green CBCR AM1_1557 from the chlorophyll d-bearing cyanobacterium Acaryochloris marina can bind BV almost comparable to PCB. This BV-bound holoprotein reversibly photoconverts between a far red light-absorbing form (Pfr, λmax = 697 nm) and an orange light-absorbing form (Po, λmax = 622 nm). At room temperature, Pfr fluoresces with a maximum at 730 nm. These spectral features are red-shifted by 48~77 nm compared with those of the PCB-bound domain. Because the absorbance of chlorophyll d is red-shifted compared with that of chlorophyll a, the BV-bound AM1_1557 may be a physiologically relevant feature of A. marina and is potentially useful as an optogenetic switch and/or fluorescence imager. PMID:25609645

  9. 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

  10. 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).

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

    Science.gov (United States)

    Boldina, Inna; Beninger, Peter G.

    2014-04-01

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

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

    DEFF Research Database (Denmark)

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

    2011-01-01

    The present study tested for density-dependent effects of the invasive drift macroalgae Gracilaria vermiculophylla (Ohmi) Papenfuss on growth and survival of the native eelgrass, Zostera marina L., under different temperature levels. Three weeks laboratory experiments were conducted in Odense...

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

    Science.gov (United States)

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

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

    DEFF Research Database (Denmark)

    Stæhr, Peter A.; Borum, Jens

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

  15. 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...

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

    Science.gov (United States)

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

  17. Diversity of the marine picocyanobacteria Prochlorococcus and Synechococcus assessed by terminal restriction fragment length polymorphisms of 16S-23S rRNA internal transcribed spacer sequences Diversidad de las picocianobacterias marinas Prochlorococcus y Synechococcus por medio de polimorfismos de longitud de fragmentos de restricción terminal en secuencias del espaciador transcrito interno del ARNr 16S - 23S

    Directory of Open Access Journals (Sweden)

    PARIS LAVIN

    2008-12-01

    distribution of these organisms.Con el fin de evaluar la utilización de secuencias del espaciador interno transcrito (ITS en estudios de genética de población de cianobacterias marinas, se amplificó y clonó la secuencia del gen ARNr 16S junto a la region espadadora 16S-23S ARNr de seis cepas de Prochlorococcus y Synechococcus. Se analizaron los amplicones del ITS por electroforesis en gel de gradiente de desnaturalización (DGGE y por polimorfismos de longitud de fragmentos de restricción terminal (T-RFLP. Al aplicar los métodos estándares de estas técnicas, se obtuvo más de una banda o fragmento de restricción terminal (T-RF por cepa o secuencia clonada. Informes en la literatura han sugerido que estas anomalías podrían ser atribuidas a la formación de estructuras secundarias. Por consiguiente, la estructura secundaria de las secuencias de ITS de las cepas de Prochlorococcus y Synechococcus fue modelada a las diferentes temperaturas que se utilizaron durante la reacción en cadena de polimerasa (PCR. Dicho modelamiento predijo la existencia de bucles que podrían persistir incluso durante la temperatura de extensión. Es probable que estos bucles generen productos de PCR con fragmentos incompletos y hebras simples. En este trabajo se modificó el procedimiento del método de T-RFLP añadiendo el partidor marcado en los últimos dos ciclos. Esto resultó, para la mayoría de los casos, la obtención de un solo fragmento de restricción por ribotipo. La aplicación de esta técnica a una muestra del medio ambiente obtenida frente al norte de Chile, demostró que es posible identificar la presencia, y determinar la abundancia relativa, de varios linajes filogenéticos de los géneros Prochlorococcus y Synechococcus que habitan la zona eufótica. El análisis filogenético de las secuencias de ITS obtenidos por clonación y secuenciación de ADN a partir de la misma muestra confirmó la presencia de los diferentes genotipos. Con la modificación propuesta, el m

  18. 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...

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

    DEFF Research Database (Denmark)

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

    2015-01-01

    , and their performance during light limitation and 4 wk of recovery was compared to non-shaded controls. In addition to growth and biomass, we investigated storage carbohydrates and quantified the expression of genes involved in carbohydrate metabolism, photosynthesis and control of oxidative stress. Plants showed......Within mono-specific meadows of clonal plants, genotypic diversity may functionally replace species diversity. Little is known about the variability in performance and plasticity of different genotypes towards anthropogenically induced stressors. In this field experiment we compared light......-limitation stress responses and recovery of different eelgrass Zostera marina genotypes to assess the variability in phenotypic plasticity and gene expression between different genotypes. Replicated monoculture plots of 4 genotypes were subjected to a simulated turbidity period of 4 wk using shading screens...

  20. High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina

    DEFF Research Database (Denmark)

    Villazán, Beatriz; Salo, Tiina Elina; Brun, Fernando G.;

    2015-01-01

    enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality...... of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 µM) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N......Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect...

  1. 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)

  2. 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.

  3. 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...

  4. 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.

  5. 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;

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

    DEFF Research Database (Denmark)

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

    2013-01-01

    Aggregations of unattached, filamentous macroalgae showed high temporal and spatial dynamics in two shallow and relatively sheltered eelgrass (Zostera marina) beds in Aarhus Bay and Isefjord, Denmark. The changes in algal abundance were followed in permanent plots at 1-3 days intervals during three...... different periods of the growth season (May to September). Drift-algal assemblages were present within the 3000 m2 study areas in relatively high and constant abundance (>47 % cover) throughout the study period. However, significant changes in average site cover did occur on short timescales (days......) 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...

  7. 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

  8. 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.

  9. 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

    spectrometry (GC–MS). During anoxia and light exposure the roots showed an altered metabolome whereas the leaves were only marginally affected, indicating that photosynthetically derived oxygen could satisfy the oxygen demand in the leaves but not in the roots. Nocturnal anoxia caused a biphasic shift...... in the metabolome of roots and leaves. The first phase, after 15 h under anoxia and 3 h of darkness showed a fast increase of lactate, pyruvate, GABA (γ-aminobutyric acid), succinate, alanine and a decrease in glutamate and glutamine. The second phase, after 21 h under anoxia and 9 h of darkness showed a decrease...... shunt as such mitigation mechanisms that alleviate pyruvate levels and lead to carbon and nitrogen storage during anoxia. This work demonstrates the applicability of metabolomics to assess low oxygen stress responses of Z. marina and allows us to propose an anoxia recovery model....

  10. 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....

  11. 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....

  12. 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.

  13. 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

  14. 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.

  15. 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.

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

    Science.gov (United States)

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

    2015-09-01

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

  17. 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.

  18. 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.

  19. 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

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

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    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.

  1. 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

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

    Science.gov (United States)

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

    2016-01-01

    Eelgrass (Zostera marina) populations occupying coastal waters of Alaska are separated by a peninsula and island archipelago into two Large Marine Ecosystems (LMEs). From populations in both LMEs, we characterize genetic diversity, population structure, and polarity in gene flow using nuclear microsatellite fragment and chloroplast and nuclear sequence data. An inverse relationship between genetic diversity and latitude was observed (heterozygosity: R2 = 0.738, P genetic partitioning across most sampling sites (θ = 0.302, P 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.

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

    Science.gov (United States)

    Ribeiro, Adelia Maria Miglievich

    2008-06-01

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

  4. 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.

  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. 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.

  7. 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.

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

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    Moretti Massimo

    2016-06-01

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

  9. 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.

  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. 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

  12. 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

  13. 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

  14. 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.

  15. 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.

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

    Directory of Open Access Journals (Sweden)

    Gregory P Brown

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

  17. Estimating aboveground biomass in Avicennia marina plantation in Indian Sundarbans using high-resolution satellite data

    Science.gov (United States)

    Manna, Sudip; Nandy, Subrata; Chanda, Abhra; Akhand, Anirban; Hazra, Sugata; Dadhwal, Vinay Kumar

    2014-01-01

    Mangroves are active carbon sequesters playing a crucial role in coastal ecosystems. In the present study, aboveground biomass (AGB) was estimated in a 5-year-old Avicennia marina plantation (approximate area ≈190 ha) of Indian Sundarbans using high-resolution satellite data in order to assess its carbon sequestration potential. The reflectance values of each band of LISS IV satellite data and the vegetation indices, viz., normalized difference vegetation index (NDVI), optimized soil adjusted vegetation index (OSAVI), and transformed difference vegetation index (TDVI), derived from the satellite data, were correlated with the AGB. OSAVI showed the strongest positive linear relationship with the AGB and hence carbon content of the stand. OSAVI was found to predict the AGB to a great extent (r=0.72) as it is known to nullify the background soil reflectance effect added to vegetation reflectance. The total AGB of the entire plantation was estimated to be 236 metric tons having a carbon stock of 54.9 metric tons, sequestered within a time span of 5 years. Integration of this technique for monitoring and management of young mangrove plantations will give time and cost effective results.

  18. 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.

  19. Influence of temperature and salinity on germination of eelgrass ( Zostera marina L.) seeds

    Science.gov (United States)

    Pan, Jinhua; Jiang, Xin; Li, Xiaojie; Cong, Yizhou; Zhang, Zhuangzhi; Li, Zhiling; Zhou, Weili; Han, Houwei; Luo, Shiju; Yang, Guanpin

    2011-06-01

    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°C) and nine salinities (5 to 45, increment of 5). The effect of significant interaction of temperature and salinity on germination rate was observed (ANOVA) ( Pgermination rate (83.3 ± 3.5)% was reached in 8 weeks at 14°C and salinity 5. Higher temperature significantly increased the germination rate at salinity 5 ( Pgermination rate at 14°C ( Ptemperature and salinity ( Ptemperature for the germination of eelgrass seeds. These results provide useful information for the propagation of artificial seedlings for seagrass restoration in China.

  20. 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.

  1. 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.

  2. 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...... 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...... biomass reduced by 30-40%), photosynthetic capacity (Pmax-reduced by 30-80%) and growth (production of new leaves reduced by 50-60%, leaf elongation rate reduced by 60-70% and production of side-shoots reduced by 40-60%), whereas eelgrass performed almost equally well at salinities between 10 and 35...

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

    Directory of Open Access Journals (Sweden)

    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.

  4. A new species of nematode (Molineidae) from Rhinella marina (Amphibia: Bufonidae) in Guerrero, México.

    Science.gov (United States)

    Ruiz-Torres, Nallely; García-Prieto, Luis; Osorio-Sarabia, David; Violante-González, Juan

    2013-06-01

    Oswaldocruzia lamotheargumedoi n. sp., inhabiting the intestine of the cane toad, Rhinella marina (L.), in Laguna de Coyuca, Guerrero, México, is described here. The new species differs from 10 congeners infecting bufonid hosts because it has a type I bursa. In contrast, 7 of these species have type II bursa and 3 more a type III bursa. The species most similar to the species described herein is Oswaldocruzia pipiens Walton, 1929 . These 2 species share traits such as body size, bursa type, presence of cervical alae, and dorsal ray morphology. Nevertheless, both species can be distinguished based on the number of synlophe ridges at mid-body (54-56 for O. lamotheargumedoi vs. 45-48 for O. pipiens) and by the presence of a chitinous support in the long, and well developed, cervical alae of O. pipiens. In the new species, these structures are short, poorly developed, and lack chitinous support. Previous records of species of Oswaldocruzia in México include Oswaldocruzia subauricularis (Rudolphi, 1819) Travassos, 1917 in the Neotropical Realm and O. pipiens in the Nearctic.

  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. 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.

  7. 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.

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

    Directory of Open Access Journals (Sweden)

    Brian S Ort

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

  9. 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.

  10. 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.

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

    Science.gov (United States)

    DeAmicis, Stacey; Foggo, Andrew

    2015-01-01

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

  12. 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

  13. 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.

  14. 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.

  15. 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.

  16. 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

  17. 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

  18. 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.

  19. 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...

  20. 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...

  1. 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...

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

    OpenAIRE

    Harvey Infante-Rojas; Javier Hernández-Fernández

    2015-01-01

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

  3. 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...

  4. 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...

  5. 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 ...

  6. 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 ...

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

    OpenAIRE

    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...

  8. 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...

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

    Directory of Open Access Journals (Sweden)

    Schneider Horacio

    2011-09-01

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

  10. 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.

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

    Science.gov (United States)

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

    2006-12-01

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

  12. 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.

  13. 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

  14. Thermostilla marina gen. nov., sp. nov., a thermophilic, facultatively anaerobic planctomycete isolated from a shallow submarine hydrothermal vent.

    Science.gov (United States)

    Slobodkina, Galina B; Panteleeva, Angela N; Beskorovaynaya, Darya A; Bonch-Osmolovskaya, Elizaveta A; Slobodkin, Alexander I

    2016-02-01

    A novel thermophilic planctomycete (strain SVX8T) was isolated from a shallow submarine hydrothermal vent, Vulcano Island, Italy. The temperature range for growth was 30-68 °C, with an optimum at 55 °C. The pH range for growth was 5.0-9.0, with an optimum at pH 7.0-8.0. Growth was observed at NaCl concentrations ranging from 0.8 to 4.5 % (w/v) with an optimum at 2.5-3.5 % (w/v). The isolate grew anaerobically using a number of mono-, di- and polysaccharides as electron donors and nitrate or elemental sulfur as electron acceptors or by fermentation. Nitrate was reduced to nitrite; sulfur was reduced to sulfide. Strain SVX8T did not grow at atmospheric concentration of oxygen but grew microaerobically (up to 2 % oxygen in the gas phase). The G+C content of the DNA of strain SVX8T was 58.5 mol%. Based on phylogenetic position and phenotypic features, the new isolate is considered to represent a novel species belonging to a new genus in the order Planctomycetales, for which the name Thermostilla marina gen. nov., sp. nov. is proposed. The type strain of Thermostilla marina is SVX8T ( = JCM 19992T = VKM B-2881T). Strain SVX8T is the first thermophilic planctomycete isolated from a marine environment. PMID:26559645

  15. 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

  16. 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

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

    Science.gov (United States)

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

  18. Has the rapidly expanding invasive dwarf eelgrass Zostera japonica in Yaquina estuary, Oregon impacted the distribution of native eelgrass Zostera marina – a critical intertidal habitat?

    Science.gov (United States)

    Native eelgrass, Zostera marina, occupies a significant portion of marine-dominated intertidal and near-subtidal sectors of many coastal estuaries. In recent decades an invasive congener, Z. japonica, has become established in many Pacific Northwest estuaries. We measured the h...

  19. Has the rapidly expanding invasive dwarf eelgrass Zostera japonica in Yaquina estuary, Oregon impacted the distribution of native eelgrass Zostera marina – a critical intertidal habitat? - CERF

    Science.gov (United States)

    Native eelgrass, Zostera marina, occupies a significant portion of marine-dominated intertidal and near-subtidal sectors of many coastal estuaries. In recent decades an invasive congener, Z. japonica, has become established in many Pacific Northwest estuaries. We measured the h...

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

    Science.gov (United States)

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

  1. 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.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2014-11-01

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

  3. 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

  4. 中国海洋卡盾藻赤潮生态学研究%Ecology of Harmful Algal Bloom Caused by Chattonella marina

    Institute of Scientific and Technical Information of China (English)

    么强; 李雪梅; 安鑫龙

    2011-01-01

    综述了中国海洋卡盾藻赤潮的类型、成因及其调控对策.%To elaborate comprehensively types, causes and mitigation countermeasures of harmful algal bloom caused by Chattonella marina in China.

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

    Science.gov (United States)

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

  6. 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

  7. 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.

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

    Directory of Open Access Journals (Sweden)

    Heike Kahlert

    2012-03-01

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

  9. 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

  10. Acoustic Streaming, The “Small Invention” of Cianobacteria?

    OpenAIRE

    Koiller, Jair; Ehlers, Kurt M.; Chalub, Fabio

    2010-01-01

    Micro-engineering pumping devices without mechanical parts appeared “way back” in the early 1990’s. The working principle is acoustic streaming. Has Nature “rediscovered” this invention 2.7 Gyr ago? Strands of marine cyanobacteria Synechococcus swim 25 diameters per second without any visible means of propulsion. We show that nanoscale amplitude vibrations on the S-layer (a crystalline shell outside the outer membrane present in motile strands) and frequencies of the order of 0.5-1.5 MHz (ach...

  11. 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

  12. 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...... 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 survival based...... on a 2-factorial laboratory experiment. Eelgrass seedlings were grown with three different heights and two different types of algae mats: Chaetomorpha linum and artificial macroalgae. The two types of mats were used to separate the physical and metabolic effects of algal presence. Concentrations...

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

    DEFF Research Database (Denmark)

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

    In 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...

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

    Data.gov (United States)

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

  15. 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...

  16. 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.)

  17. 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

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

    Science.gov (United States)

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

    2012-10-15

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

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

    Science.gov (United States)

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

    2015-01-01

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

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

    Science.gov (United States)

    Bos, Peter M J; Gottardo, Stefania; Scott-Fordsmand, Janeck J; van Tongeren, Martie; Semenzin, Elena; Fernandes, Teresa F; Hristozov, Danail; Hund-Rinke, Kerstin; Hunt, Neil; Irfan, Muhammad-Adeel; Landsiedel, Robert; Peijnenburg, Willie J G M; Sánchez Jiménez, Araceli; van Kesteren, Petra C E; Oomen, Agnes G

    2015-12-01

    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.

  1. 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

  2. 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

  3. 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.

  4. 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...

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

    DEFF Research Database (Denmark)

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

    2008-01-01

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

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

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    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

  7. 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。

  8. 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

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

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    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

  10. Removing Oscillatoria and Humic Acid from Mixed Water by Potassium Ferrate(Ⅵ) Pre-oxidation and Co-coagulation%K2FeO4预氧化复合絮凝处理颤藻和腐殖酸混合水

    Institute of Scientific and Technical Information of China (English)

    赵春禄; 刘琰

    2011-01-01

    采用K2FeO4预氧化复合高岭土和聚合氯化铝(PAC)混凝处理了含颤藻和腐殖酸的混合水,并探讨了对处理后水中残留铝含量及其形态分布的影响.结果表明:投加4.0 mg·L-1K2FeO4预氧化就能使混合水样的浊度、腐殖酸和藻类的去除率分别达到94.05%、91.67%和90.78%,明显优于相同条件下单纯的PAC处理效果;水样的pH值对K2FeO4预氧化有显著的影响,在pH=6.5时效果最好;K2FeO4预氧化影响处理后水中残留铝的含量和形态,在最佳条件下总铝浓度降低了51.8%,特别是对人体毒害作用最大的溶解态铝降低了43.9%.%The mixed water containing Oscillatoria and humic acid was disposed by using potassium ferrate(Ⅵ) as the pre-oxidation agent, poly-aluminum chloride(PAC) and Kaolin as the co-coagulation agents. The residual aluminum morphology was also studied.The consequence was that the ferrate concentration with 4.0 mg· L-1 could improve the removal rate of turbidity, HA and algae, whose value was 94.05%, 91.67% and 90. 78% respectively, and the effect was much better than PAC singly. The pH value affected the efficiency of ferrate pre-oxidation processing mixed water. In acidic condition (pH = 6. 5) the effect was best. Potassium ferrate(Ⅵ) pre-oxidation affected the content and form of residual aluminum. Under the best condition the total aluminum concentration reduced by 51.8%, and especially the dissolved aluminum which poisoned human body decreased by 43.9%.

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

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    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.

  12. 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.

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

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    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.

  14. 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

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

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    Claudio Magallanes

    2013-06-01

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

  16. 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

  17. Spectral properties of bacteriophytochrome AM1_5894 in the chlorophyll d-containing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Loughlin, Patrick C; Duxbury, Zane; Mugerwa, Tendo T Mukasa; Smith, Penelope M C; Willows, Robert D; Chen, Min

    2016-01-01

    Acaryochloris marina, a unicellular oxygenic photosynthetic cyanobacterium, has uniquely adapted to far-red light-enriched environments using red-shifted chlorophyll d. To understand red-light use in Acaryochloris, the genome of this cyanobacterium was searched for red/far-red light photoreceptors from the phytochrome family, resulting in identification of a putative bacteriophytochrome AM1_5894. AM1_5894 contains three standard domains of photosensory components as well as a putative C-terminal signal transduction component consisting of a histidine kinase and receiver domain. The photosensory domains of AM1_5894 autocatalytically assemble with biliverdin in a covalent fashion. This assembled AM1_5894 shows the typical photoreversible conversion of bacterial phytochromes with a ground-state red-light absorbing (Pr) form with λBV max[Pr] 705 nm, and a red-light inducible far-red light absorbing (Pfr) form with λBV max[Pfr] 758 nm. Surprisingly, AM1_5894 also autocatalytically assembles with phycocyanobilin, involving photoreversible conversion of λPCB max[Pr] 682 nm and λPCB max[Pfr] 734 nm, respectively. Our results suggest phycocyanobilin is also covalently bound to AM1_5894, while mutation of a cysteine residue (Cys11Ser) abolishes this covalent binding. The physiological function of AM1_5894 in cyanobacteria containing red-shifted chlorophylls is discussed. PMID:27282102

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

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    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.

  19. 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

  20. GENETIC DIVERSITY OF MANGROVE PLANT-Avicennia marina ALONG BEIHAI COAST BY RAPD%红树植物白骨壤(Avicennia marina)遗传分化的RAPD分析

    Institute of Scientific and Technical Information of China (English)

    赵萌莉; 林鹏; 闻宇

    2001-01-01

    Random amplified polymorphic DNA(RAPD)technique was applied toanalyzing population genetics of native Avicennia marina,an wide spread species,whose natured population today is destroyed by mankind along Baihai,Guangxi coast.Leaf samples were collected form 30 natural trees in the native population and 15 arbitrary primers were used to amplify 73,71 and 68 bands that contain 28,25 and 20 polymorphic RAPD loci in three populations respectively.The mean genetic distance intra-populations were 0.165、0.147 and 0.108;while inter-population were 0.135、0.163 and 0.179.The results showing that either the intra-or inter-population genetic variety were low.%采用随机扩增多态DNA(RAPD)分析了分布于广西北海海岸的3个自然分布居群的白骨壤群落,用15个随机引物进行PCR扩增,3个居群的RAPD多态位点的百分率分别为英罗湾38.35%,大冠沙35.21%钦州湾29.41%。3个居群内的平均遗传距离分别为0.108、0.147和0.165;3个居群两两之间的平均遗传距离分别为大冠沙-英罗湾0.135、大冠沙-钦州湾0.163和英罗湾-钦州湾0.179。结果表明,白骨壤居群内和居群间的遗传变异较低。

  1. 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

  2. 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

  3. 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.

  4. 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

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

    Science.gov (United States)

    Buapet, Pimchanok; Björk, Mats

    2016-07-01

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

  6. 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

  7. 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.

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

    Directory of Open Access Journals (Sweden)

    Haley BOWCOCK, Gregory P. BROWN, Richard SHINE

    2013-12-01

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

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

    Science.gov (United States)

    Fidelibus, Maria Dolores; Campana, Claudia

    2014-05-01

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

  10. Decline in eelgrass ( Zostera marina L.) in Long Island Sound near Millstone Point, Connecticut (USA) unrelated to thermal input

    Science.gov (United States)

    Keser, Milan; Swenarton, John T.; Vozarik, Joseph M.; Foertch, James F.

    2003-02-01

    Eelgrass ( Zostera marina L.) shoot density, seed-bearing shoot abundance, shoot length, and standing stock biomass were monitored during summer months from 1985 to 2000 at three locations in eastern Long Island Sound (LIS) near Millstone Power Station (MPS), Waterford, Connecticut, USA. Short-term declines in eelgrass abundance were directly associated with fouling and overgrowth of eelgrass on two occasions; once by blue mussels ( Mytilus edulis) and once by a bloom of green algae ( Cladophora spp.). Analysis of long-term trends indicated some degree of decline in most of the parameters examined at all three areas monitored. The spatial relationship of the long-term eelgrass declines suggests primary causal factors other than the power plant discharge or regional climate change. Two populations to the east of MPS and near the fringes of the thermal plume (Niantic River, located >2 km from the power plant thermal plume. Die-offs of entire individual eelgrass study beds in the Niantic River were observed on five separate occasions during the study with no sign of recovery. While the causes were not determined, anthropogenic influences such as nutrient loading from surface run-off and groundwater sources may have contributed to observed declines. The Niantic River has a more restricted tidal inlet and is closer to sources of nutrient enrichment than Jordan Cove. Historically, eelgrass has ranged to far western reaches of LIS, but over the last century has become restricted to the easternmost third of the Connecticut coastline due to nutrient loading and eutrophication of the western portions. This study suggests that the west-to-east declining trend in eelgrass distribution in LIS may be further progressing.

  11. 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

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

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

    Directory of Open Access Journals (Sweden)

    Reid Tingley

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

  19. Behaviour of butyltin compounds in the sediment pore waters of a contaminated marina (Port Camargue, South of France).

    Science.gov (United States)

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

    2016-05-01

    Despite the ban on tributyltin (TBT) in marine paints, harbour sediments are still highly contaminated by this antifouling agent. Concentrations of TBT and its dealkylated products dibutyltin (DBT) and monobutyltin (MBT) were determined in the pore waters of Port Camargue, a large marina located on the French Mediterranean coast. Pore waters were sampled in the field using peepers deployed in summer 2012 and 2013 and in winter 2012-2013. The winter surveys were characterized by the presence of sulphides in pore waters from a depth of 5 cm, which was not the case in winter. In summer 2013, TBT was shown to be released into pore waters below the sediment-water interface (SWI) at concentrations of up to 70 ngSn L(-1). This release was also observed in sediment anaerobic incubations and was attributed to the mineralization of the sedimentary organic matter, possible stabilization of TBT by complexation with sulphides, and lower debutylation rates in anoxic than in oxic conditions. In summer 2012, a comparatively lower concentration of TBT (around 20 ngSn L(-1) below the SWI) was measured and the presence of methyltin species was detected. We hypothesize that the differences between the two surveys reflect different microbial activity. In winter 2012-2013, marked by Fe-reducing conditions in the sediments, TBT was released into solution at the SWI at concentrations of up to 40 ngSn L(-1). Sediments are thus a continuing source of TBT for the overlying waters despite the ban on its use for boats in France. PMID:26897083

  20. 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 ...

  1. THE SEPERATION AND IDENTIFICATION OF THREE COMPONENTS OF Tubuaria marina%海筒螅中3种化学成分的分离鉴定

    Institute of Scientific and Technical Information of China (English)

    张立新; 范晓

    2002-01-01

    海筒螅(Tubuaria marina)的94%乙醇提取物,在水中混悬后,用石油醚萃取,石油醚相中的提取物经反复硅胶柱色谱分离和Sephadex LH-20凝胶柱色谱分离,得到三个纯净的化合物.经1HNMR,13CNMR和DEPT谱鉴定,分别确定为二十一碳一烯、胆甾-5-烯-3β-醇和1-壬基-甘油醚.

  2. 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...

  3. 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...

  4. 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

  5. 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,...

  6. 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...

  7. 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...

  8. 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...

  9. 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...

  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. 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

  12. 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 ...

  13. 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...

  14. 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 ...

  15. 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...

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

    OpenAIRE

    Correa, David; Tam, Jorge; Pasapera, José; Saavedra, Miguel; Ingunza, Augusto

    2008-01-01

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

  17. 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...

  18. 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

  19. Determinación de los factores que inciden en la captura incidental de aves marinas en la flota palangrera pelágica chilena Determination of factors affecting the bycatch of seabirds in Chilean pelagic longline fleet

    OpenAIRE

    Andrés González; Rodrigo Vega; María Ángela Barbieri; Eleuterio Yánez

    2012-01-01

    Se analizó la relación entre la variabilidad de la tasa de captura incidental de aves marinas en la pesquería palangrera pelágica de pez espada (Xiphias gladius) y diversos factores temporales, ambientales, espaciales y pesqueros, entre 2007 y 2009. Los resultados muestran que las operaciones de pesca de esta flota afectan principalmente a los albatros, grupo que concentra el 83,7% de la captura incidental de aves marinas registrada en el período. Esta captura incidental se debe en primera in...

  20. 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

  1. 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.

  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. 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

  4. 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

  5. Red-shifted red/green-type cyanobacteriochrome AM1_1870g3 from the chlorophyll d-bearing cyanobacterium Acaryochloris marina.

    Science.gov (United States)

    Narikawa, Rei; Fushimi, Keiji; Ni-Ni-Win; Ikeuchi, Masahiko

    2015-05-29

    Cyanobacteriochromes (CBCRs) are diverse photoreceptors that are found only from cyanobacteria and cover wide range of light qualities. CBCRs are divided into two types regarding the chromophore species they contain: phycocyanobilin (PCB) and phycoviolobilin. Red/green-type CBCRs are widely distributed subfamily among the PCB-binding CBCRs and photoconvert between a red-absorbing thermostable form and a green-absorbing metastable form. Our recent study discovered that a red/green-type CBCR, AM1_1557g2, from a cyanobacterium Acaryochloris marina covalently binds not only PCB but also biliverdin (BV). BV-binding AM1_1557g2 photoconverts between a far-red absorbing form and an orange-absorbing form. We report, herein, that another red/green-type CBCR, AM1_1870g3, from the cyanobacterium A. marina also bound both PCB and BV. PCB- and BV-binding ones showed red/green and far-red/orange reversible photoconversions, respectively. Unexpectedly, absorbing wavelengths are 10-20 nm red-shifted compared with those of AM1_1557g2. These red-shifted characteristics may be useful for optogenetic light switches that work in various organisms. PMID:25892514

  6. Nitrosomonas Nm143-like ammonia oxidizers and Nitrospira marina -like nitrite oxidizers dominate the nitrifier community in a marine aquaculture biofilm

    DEFF Research Database (Denmark)

    Foesel, Bärbel U.; Gieseke, Armin; Schwermer, Carsten;

    2008-01-01

    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 re......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......A) 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...

  7. 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.

  8. 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 below-ground 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

  9. Nitrogen budget of the eelgrass, Zostera marina in a bay system on the south coast of Korea

    Science.gov (United States)

    Park, Sang Rul; Kim, Young Kyun; Kim, Seung Hyeon; Lee, Kun-Seop

    2013-12-01

    Above- and below-ground productivities and tissue N content were measured monthly to quantify N incorporation to sustain eelgrass growth in Koje Bay on the south coast of Korea from January to December 2002. N acquisition was also estimated through measurements of N uptake kinetics, tissue biomass, and in situ inorganic N concentrations in water column and sediments. Above- and below-ground productivities were highest in summer and lowest in late fall and winter. Leaf tissue N content was highest in December and lowest in July, while rhizome tissue N content was highest in October and lowest in April. Estimated monthly N incorporation by leaf tissues based on the leaf productivity and N content ranged from 0.4 g N m-2 month-1 in November to 2.0 g N m-2 month-1 in May. N incorporation by below-ground tissues ranged from 0.1 g N m-2 month-1 in February to 0.2 g N m-2 month-1 in October. Annual whole plant N incorporation was 14.5 g N m-2 y-1, and N incorporation by leaf tissues accounted for about 87 % of total N incorporation. Maximum uptake rate ( V max ) and half saturation constant ( K m ) of leaf NH4 + uptake were significantly lower than those of root NH4 + uptake. Above- and below-ground biomass ranged from 20.8 g DW m-2 and 8.6 g DW m-2 in winter to 350.0 g DW m-2 and 81.3 g DW m-2 in spring, respectively. NH4 + concentrations varied from 0.2 to 4.3 mM in water column and from 93.0 to 551.7 mM in sediment pore water. Based on these measurements, annual N acquisition by root tissues contributed slightly higher than that by leaf tissues to total plant N acquisition. During winter, monthly leaf N acquisition was lower than monthly leaf N incorporation. This implies that Z. marina has internal nitrogen retention system to offset the shortage and excess of nitrogen.

  10. 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.

  11. 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.

  12. 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

  13. 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

  14. 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

  15. 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.

  16. 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..."

  17. La familia Hemiaulaceae (Bacillariophyceae de las aguas marinas chilenas The family Hemiaulaceae (Bacillariophyceae from marine Chilean waters

    Directory of Open Access Journals (Sweden)

    PATRICIO RIVERA

    2003-12-01

    Full Text Available La familia Hemiaulaceae comprende cuatro géneros, señalados previamente para las aguas chilenas con las siguientes especies: Cerataulina pelagica (Cleve Hendey, Hemiaulus sinensis Greville, H. membranaceus Cleve, Climacodium biconcavum Cleve, Eucampia antarctica (Castracane Mangin, E. cornuta (Cleve Grunow y E. zodiacus Ehrenberg. Sin embargo, el análisis con microscopía fotónica y electrónica de muestras recolectadas en aguas marinas chilenas que contenían representantes de esta familia (incluyendo la mayoría de aquellas estudiadas anteriormente por otros investigadores nacionales reveló que (1 el género Cerataulina está representado por C. pelagica, distribuida a lo largo de la costa chilena entre Arica por el norte y el Estrecho de Magallanes por el sur, (2 el género Eucampia está representado por cuatro taxa: E. zodiacus f. cylindrocornis Syvertsen (señalada en trabajos anteriores como E. zodiacus f. zodiacus, E. zodiacus f. recta Rivera. Avaria & Cruces f. nov. (descrita aquí, E. cornuta y E. antarctica. Los primeros tres taxa se distribuyen en la zona central y norte de Chile, mientras que E. antarctica es propia de las aguas antárticas desde el Estrecho de Magallanes al sur, (3 las citas anteriores de Hemiaulus sinensis, H. membranaceus y Climacodium biconcavum para las aguas chilenas corresponden a determinaciones erróneas de Eucampia zodiacus f. recta, f. nov. Se entregan descripciones de los taxa encontrados y fotografías obtenidas con los microscopios fotónico y electrónicos que ilustran sus principales características morfológicasThe Family Hemiaulaceae comprises four genera, all of which have been previously reported for coastal waters off Chile, and represented by the following taxa: Cerataulina pelagica (Cleve Hendey, Hemiaulus sinensis Greville, H. membranaceus Cleve, Climacodium biconcavum Cleve, Eucampia antarctica (Castracane Mangin, E. cornuta (Cleve Grunow and E. zodiacus Ehrenberg. However, examination

  18. 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

  19. 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

  20. 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

  1. 亦奢华,亦壮美——新加坡滨海湾金沙酒店%Luxury and magnificent-Marina Bay Sands

    Institute of Scientific and Technical Information of China (English)

    马旭生

    2011-01-01

    @@ Marina Bay Sands是美国拉斯维加斯金沙集团在新加坡斥巨资打造而成的大型综合衣华娱乐城.项目由世界最贵的酒店、世界最大.高的室外无界泳池、亚洲最大公共空中花园、国际会议及展览中心、华剧院、艺术科学博物馆、典食时尚中心和购物广场等组成,其豪华的程度和丰富的设施在亚洲可谓一时无两.

  2. 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.

  3. 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

  4. 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.

  5. 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...

  6. Estudio de macronutrientes para la producción de PUFAs a partir de la microalga marina Isochrysis galbana

    Directory of Open Access Journals (Sweden)

    García Sánchez, J. L.

    1994-10-01

    Full Text Available Marine microalgae are presented as alternative sources for polyunsaturated fatty acids production.
    A macronutrient optimization method for culture media commonly used for Isochrysis galbana growth is discussed. This microalga has been reported as a good RUFA producer.
    The optimization was conducted applying the response surface technique, parameters tested being nitrate, phosphate, ferric citrate and manganese chloride concentrations and the suplementary CO2 in the bubbling air.
    The results show the evidence of growth limitation with the initial culture media and it is proposed a second optimization step considering as design variables the different ratios between media components.

    Las microalgas marinas se presentan como una fuente altemativa en la producción de ácidos grasos poliinsaturados (PUFAs, frente a las fuentes convencionales, como son los aceites de pescado.
    En este trabajo se presenta un estudio de macronutrientes para el medio de cultivo utilizado en el crecimiento de la microalga marina Isochrysis galbana, empleada con este objetivo.
    La metodología de optimización aplicada ha sido la técnica de superficie de respuesta, siendo los factores estudiados el porcentaje de CO2 suplementario en la corriente de burbujeo, y las concentraciones de nitratos, fosfatos, citrato férrico y cloruro de manganeso en el medio de cultivo. Los resultados de este trabajo ponen de manifiesto la existencia de limitaciones al crecimiento con el medio de partida y orientan a una segunda etapa de optimización, tomando como variables de diseño las relaciones entre los distintos componentes del medio de cultivo.

  7. 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.

  8. 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.

  9. The concept of population in clonal organisms: mosaics of temporally colonized patches are forming highly diverse meadows of Zostera marina in Brittany.

    Science.gov (United States)

    Becheler, R; Diekmann, O; Hily, C; Moalic, Y; Arnaud-Haond, S

    2010-06-01

    Seagrasses structure some of the world's key coastal ecosystems presently in decline due to human activities and global change. The ability to cope with environmental changes and the possibilities for shifts in distribution range depend largely on their evolvability and dispersal potential. As large-scale data usually show strong genetic structure for seagrasses, finer-grained work is needed to understand the local processes of dispersal, recruitment and colonization that could explain the apparent lack of exchange across large distances. We aimed to assess the fine-grained genetic structure of one of the most important and widely distributed seagrasses, Zostera marina, from seven meadows in Brittany, France. Both classic population genetics and network analysis confirmed a pattern of spatial segregation of polymorphism at both regional and local scales. One location exhibiting exclusively the variety 'angustifolia' did not appear more differentiated than the others, but instead showed a central position in the network analysis, confirming the status of this variety as an ecotype. This phenotypic diversity and the high allelic richness at nine microsatellites (2.33-9.67 alleles/locus) compared to levels previously reported across the distribution range, points to Brittany as a centre of diversity for Z. marina at both genetic and phenotypic levels. Despite dispersal potential of several 100 m, a significant pattern of genetic differentiation, even at fine-grained scale, revealed 'genetic patchiness'. Meadows seem to be composed of a mosaic of clones with distinct origins in space and time, a result that calls into question the accuracy of the concept of populations for such partially clonal species.

  10. 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...

  11. 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...

  12. 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.

  13. 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.

  14. 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.

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

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    Y. Flores-Monter

    2015-01-01

    Full Text Available Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV, un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a Preparación y construcción y b Operación y mantenimiento, como una herramienta de ayuda a la toma de decisiones en la conservación de las especies Lepidochelys olivácea (tortuga golfina, Chelonia agassizii (tortuga prieta y Dermochelys coriácea (tortuga laúd. Método: Se calculó la densidad de anidación (nidos por kilómetro y se utilizó el método de evaluación multicriterio (EMC discreto Proceso Analítico Jerárquico (PAJ, para estimar el impacto de 8 amenazas turísticas: desmonte y despalme, excavaciones, rellenos, contaminación sonora, residuos sólidos, presencia de personal de obra y construcciones provisionales, iluminación artificial del frente de playa y concentración de visitantes. Se construyó una matriz de comparación, se asignó un peso a cada amenaza, y mediante el uso de un SIG se generaron los mapas de impacto potencial del turismo. Resultados: Las amenazas con mayor peso o ponderación (eigenvector total fueron los rellenos (0.36482 y la concentración de visitantes (0.38194. La construcción y operación turística puede afectar el 59.8% de las anidaciones e impactar principalmente en la costa sur el km 1 (1 142 registros de nidos colectados y, en la costa norte el km 1 (329 nidos, km 3 (311 nidos, km 4 (268 nidos y km 5 (151 nidos. Discusión o Conclusión: La playa de anidación en Chalacatepec es de gran importancia para la protección y conservación de las tortugas marinas. La presente EMC fue una herramienta adecuada para estimar las consecuencias del

  16. 厦门市红树植物白骨壤(Avicennia marina)两个种群的遗传变异及建立机制%Study on distribution and foundation mechanism of two Avicennia marina populations in Xiamen

    Institute of Scientific and Technical Information of China (English)

    葛菁萍; 蔡柏岩; 林鹏

    2004-01-01

    利用水平切片淀粉凝胶及聚丙烯酰胺凝胶分析了位于厦门市两个白骨壤(Avicennia marina)种群的遗传变异及遗传分化,进而分析了其中的游泳池种群的分布及建立机制.结果表明:游泳池白骨壤种群和东屿白骨壤种群相比较,种群内的遗传变异较大,两种群之间的遗传分化较大,游泳池种群建立时未受到建立者效应的影响.

  17. 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

  18. 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.

  19. 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

  20. 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.

  1. 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

  2. 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

  3. 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

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

    Directory of Open Access Journals (Sweden)

    Ruchy Jain

    2014-05-01

    Full Text Available Avicennia marina (AM exhibits various biological activities and has been traditionally used in Egypt to cure skin diseases. In this study, the methanolic heartwood extract of AM was evaluated for inhibitory activity against 5α-reductase (5α-R [E.C.1.3.99.5], the enzyme responsible for the over-production of 5α-dihydrotestosterone (5α-DHT causing androgenic alopecia (AGA. An AGA-relevant cell-based assay was developed using human hair dermal papilla cells (HHDPCs, the main regulator of hair growth and the only cells within the hair follicle that are the direct site of 5α-DHT action, combined with a non-radioactive thin layer chromatography (TLC detection technique. The results revealed that AM is a potent 5α-R type 1 (5α-R1 inhibitor, reducing the 5α-DHT production by 52% at the final concentration of 10 µg/mL. Activity-guided fractionation has led to the identification of avicequinone C, a furanonaphthaquinone, as a 5α-R1 inhibitor with an IC50 of 9.94 ± 0.33 µg/mL or 38.8 ± 1.29 µM. This paper is the first to report anti-androgenic activity through 5α-R1 inhibition of AM and avicequinone C.

  5. 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

  6. 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

  7. The highly reduced and fragmented mitochondrial genome of the early-branching dinoflagellate Oxyrrhis marina shares characteristics with both apicomplexan and dinoflagellate mitochondrial genomes.

    Science.gov (United States)

    Slamovits, Claudio H; Saldarriaga, Juan F; Larocque, Allen; Keeling, Patrick J

    2007-09-14

    The mitochondrial genome and the expression of the genes within it have evolved to be highly unusual in several lineages. Within alveolates, apicomplexans and dinoflagellates share the most reduced mitochondrial gene content on record, but differ from one another in organisation and function. To clarify how these characteristics originated, we examined mitochondrial genome form and expression in a key lineage that arose close to the divergence of apicomplexans and dinoflagellates, Oxyrrhis marina. We show that Oxyrrhis is a basal member of the dinoflagellate lineage whose mitochondrial genome has some unique characteristics while sharing others with apicomplexans or dinoflagellates. Specifically, Oxyrrhis has the smallest gene complement known, with several rRNA fragments and only two protein coding genes, cox1 and a cob-cox3 fusion. The genome appears to be highly fragmented, like that of dinoflagellates, but genes are frequently arranged as tandem copies, reminiscent of the repeating nature of the Plasmodium genome. In dinoflagellates and Oxyrrhis, genes are found in many arrangements, but the Oxyrrhis genome appears to be more structured, since neighbouring genes or gene fragments are invariably the same: cox1 and the cob-cox3 fusion were never found on the same genomic fragment. Analysing hundreds of cDNAs for both genes and circularized mRNAs from cob-cox3 showed that neither uses canonical start or stop codons, although a UAA terminator is created in the cob-cox3 fusion mRNA by post-transcriptional oligoadenylation. mRNAs from both genes also use a novel 5' oligo(U) cap. Extensive RNA editing is characteristic of dinoflagellates, but we find no editing in Oxyrrhis. Overall, the combination of characteristics found in the Oxyrrhis genome allows us to plot the sequence of many events that led to the extreme organisation of apicomplexan and dinoflalgellate mitochondrial genomes.

  8. Isolation and identification of compounds from marine mangrove plant Avicennia marina%红树植物白骨壤化学成分的分离鉴定

    Institute of Scientific and Technical Information of China (English)

    孙昱; 丁怡; 林文翰

    2009-01-01

    目的:研究红树植物白骨壤(Avicennia marina)叶子部位次生代谢产物的结构多样性.方法:采用多种色谱方法进行分离纯化,通过波谱方法,并对照文献鉴定化合物结构.结果:分离并鉴定了21个苯丙素和萘醌类化合物,包括3个新化合物,分别是erythro-guaiacylglycerol-β-ferulic acid ether(1),marinnone A(16)和marinnone B(17);18个已知物,分别是threo-guaiacylglycerol-β-ferulic acid ether(2),eleutheroside E2(3),(+)-lirioresinol A(4),dihydroxymethyl-his(3,5-dimethoxy-4-hydroxyphenyl)tetrahydrofuran-9-O-β-glucopyranoside(5),(+)-lyonire-sinol 3α-O-β-D-glucopyranoside(6),(-)-lyoniresinol 3α-O-β-D-glucopyranoside(7),epi-pinoresinol(8),leucoseceptoside A(9),jionoside C(10),salsaside A(11),ilicifolioside A(12),acteoside(13),isoacteoside(14),ethyl ferulate(15),avicennone D(18),avicenone E(19),avicennol C(20),stenocarpoquinone B(21),其中化合物1和2互为差向异构体,16和17互为同分异构体.结论:化合物1,16,17为新化合物,13个已知化合物2~12,14,15为首次从该属植物中获得.

  9. Marine diatoms from Buenos Aires coastal waters (Argentina: II. Thalassionemataceae and Rhaphoneidaceae Diatomeas marinas de aguas costeras de la Provincia de Buenos Aires (Argentina: II. Thalassionemataceae y Rhaphoneidaceae

    Directory of Open Access Journals (Sweden)

    EUGENIA A SAR

    2007-03-01

    Full Text Available This study describes the diversity of the species belonging to the diatom families Thalassionemataceae Round and Rhaphoneidaceae Forti frequently found in the temperate marine coastal waters of Buenos Aires Province, Argentina, from October 1994 to September 2000. It comprises morphological, taxonomic and distributional analysis of species found in planktonic samples collected at San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar and Villa Gesell. Raw and cleaned samples were analysed with light and scanning electron microscopy. Four taxa of the genus Thalassionema Grunow ex Mereschkowsky amend. Hallegraeff, one of the genus Lioloma Hasle, two of the genus Delphineis Andrews and one of the genus Rhaphoneis Ehrenberg, were identified. Thalassionema pseudonitzschioides (Schuette & Schrader Hasle, Thalassionema synedriforme (Greville Hasle and Lioloma pacificum (Cupp Hasle in Hasle & Syvertsen are new records for ArgentinaEste estudio describe la diversidad de especies de diatomeas pertenecientes a las familias Thalassionemataceae Round and Rhaphoneidaceae Forti encontradas frecuentemente en aguas costeras marinas de la Provincia de Buenos Aires, Argentina, entre octubre de 1994 y septiembre de 2000. En él se lleva a cabo el estudio morfológico, taxonómico y distribucional de las especies halladas en muestras planctónicas colectadas en San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar y Villa Gesell. Material sin tratar y tratado fue analizado con microscopio óptico y microscopio electrónico de barrido. Cuatro taxa de Thalassionema Grunow ex Mereschkowsky amend. Hallegraeff, uno de Lioloma Hasle, dos de Delphineis Andrews y uno de Rhaphoneis Ehrenberg, fueron identificados. Thalassionema pseudonitzschioides (Schuette & Schrader Hasle, Thalassionema synedriforme (Greville Hasle y Lioloma pacificum (Cupp Hasle in Hasle & Syvertsen son reportadas por

  10. 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.   

  11. Identification and analysis of red sea mangrove (Avicennia marina microRNAs by high-throughput sequencing and their association with stress responses.

    Directory of Open Access Journals (Sweden)

    Basel Khraiwesh

    Full Text Available Although RNA silencing has been studied primarily in model plants, advances in high-throughput sequencing technologies have enabled profiling of the small RNA components of many more plant species, providing insights into the ubiquity and conservatism of some miRNA-based regulatory mechanisms. Small RNAs of 20 to 24 nucleotides (nt are important regulators of gene transcript levels by either transcriptional or by posttranscriptional gene silencing, contributing to genome maintenance and controlling a variety of developmental and physiological processes. Here, we used deep sequencing and molecular methods to create an inventory of the small RNAs in the mangrove species, Avicennia marina. We identified 26 novel mangrove miRNAs and 193 conserved miRNAs belonging to 36 families. We determined that 2 of the novel miRNAs were produced from known miRNA precursors and 4 were likely to be species-specific by the criterion that we found no homologs in other plant species. We used qRT-PCR to analyze the expression of miRNAs and their target genes in different tissue sets and some demonstrated tissue-specific expression. Furthermore, we predicted potential targets of these putative miRNAs based on a sequence homology and experimentally validated through endonucleolytic cleavage assays. Our results suggested that expression profiles of miRNAs and their predicted targets could be useful in exploring the significance of the conservation patterns of plants, particularly in response to abiotic stress. Because of their well-developed abilities in this regard, mangroves and other extremophiles are excellent models for such exploration.

  12. Thalassotalea marina sp. nov., isolated from a marine recirculating aquaculture system, reclassification of Thalassomonas eurytherma as Thalassotalea eurytherma comb. nov. and emended description of the genus Thalassotalea.

    Science.gov (United States)

    Hou, Ting-Ting; Liu, Ying; Zhong, Zhi-Ping; Liu, Hong-Can; Liu, Zhi-Pei

    2015-12-01

    A Gram-stain-negative, facultatively anaerobic bacterium, strain QBLM2T, was isolated from rearing water of a marine recirculating aquaculture system in Tianjin, China. Its taxonomic position was investigated through a polyphasic approach. Cells of strain QBLM2T were non-spore-forming rods, motile by means of a single polar flagellum. Positive for oxidase and catalase. Growth occurred at 15-40 °C (optimum 30 °C), at pH 6.5-10.5 (optimum pH 7.5-8.5) and in the presence of 0-5.0 % (w/v) NaCl (optimum 3 %). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain QBLM2T formed a distinct lineage within the genus Thalassotalea and exhibited sequence similarities of 94.5-96.3 % to members of the genus Thalassotalea. The predominant fatty acids (>10 %) were C17 : 1ω8c and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The major polar lipids were phosphatidylglycerol and phosphatidylethanolamine. Ubiquinone 8 (Q-8) was the major ubiquinone. The DNA G+C content was 37.1 mol%. Based on the data above, strain QBLM2T is considered to represent a novel species of the genus Thalassotalea, for which the name Thalassotalea marina sp. nov. is proposed. The type strain is QBLM2T ( = CGMCC 1.12814T = KCTC 42731T). Phylogenetic analyses indicated that Thalassomonas eurytherma Za6a-12T fell within the genus Thalassotalea, so it is reclassified as Thalassotalea eurytherma comb. nov. and the description of the genus Thalassotalea is emended. PMID:26400666

  13. 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

  14. 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.

  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. Excitation energy transfer and electron-vibrational coupling in phycobiliproteins of the cyanobacterium Acaryochloris marina investigated by site-selective spectroscopy.

    Science.gov (United States)

    Gryliuk, G; Rätsep, M; Hildebrandt, S; Irrgang, K-D; Eckert, H-J; Pieper, J

    2014-09-01

    In adaption to its specific environmental conditions, the cyanobacterium Acaryochloris marina developed two different types of light-harvesting complexes: chlorophyll-d-containing membrane-intrinsic complexes and phycocyanobilin (PCB) - containing phycobiliprotein (PBP) complexes. The latter complexes are believed to form a rod-shaped structure comprising three homo-hexamers of phycocyanin (PC), one hetero-hexamer of phycocyanin and allophycocyanin (APC) and probably a linker protein connecting the PBPs to the reaction centre. Excitation energy transfer and electron-vibrational coupling in PBPs have been investigated by selectively excited fluorescence spectra. The data reveal a rich spectral substructure with a total of five low-energy electronic states with fluorescence bands at 635nm, 645nm, 654nm, 659nm and a terminal emitter at about 673 nm. The electronic states at ~635 and 645 nm are tentatively attributed to PC and APC, respectively, while an apparent heterogeneity among PC subunits may also play a role. The other fluorescence bands may be associated with three different isoforms of the linker protein. Furthermore, a large number of vibrational features can be identified for each electronic state with intense phonon sidebands peaking at about 31 to 37cm⁻¹, which are among the highest phonon frequencies observed for photosynthetic antenna complexes. The corresponding Huang-Rhys factors S fall in the range between 0.98 (terminal emitter), 1.15 (APC), and 1.42 (PC). Two characteristic vibronic lines at about 1580 and 1634cm⁻¹ appear to reflect CNH⁺ and CC stretching modes of the PCB chromophore, respectively. The exact phonon and vibrational frequencies vary with electronic state implying that the respective PCB chromophores are bound to different protein environments. This article is part of a special issue entitled: photosynthesis research for sustainability: keys to produce clean energy. PMID:24560813

  17. 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.

  18. Coexisting cryptic species of the Litoditis marina complex (Nematoda) show differential resource use and have distinct microbiomes with high intraspecific variability.

    Science.gov (United States)

    Derycke, S; De Meester, N; Rigaux, A; Creer, S; Bik, H; Thomas, W K; Moens, T

    2016-05-01

    Differences in resource use or in tolerances to abiotic conditions are often invoked as potential mechanisms underlying the sympatric distribution of cryptic species. Additionally, the microbiome can provide physiological adaptations of the host to environmental conditions. We determined the intra- and interspecific variability of the microbiomes of three cryptic nematode species of the Litoditis marina species complex that co-occur, but show differences in abiotic tolerances. Roche 454 pyrosequencing of the microbial 16S rRNA gene revealed distinct bacterial communities characterized by a substantial diversity (85-513 OTUs) and many rare OTUs. The core microbiome of each species contained only very few OTUs (2-6), and four OTUs were identified as potentially generating tolerance to abiotic conditions. A controlled experiment in which nematodes from two cryptic species (Pm1 and Pm3) were fed with either an E. coli suspension or a bacterial mix was performed, and the 16S rRNA gene was sequenced using the MiSeq technology. OTU richness was 10-fold higher compared to the 454 data set and ranged between 1118 and 7864. This experiment confirmed the existence of species-specific microbiomes, a core microbiome with few OTUs, and high interindividual variability. The offered food source affected the bacterial community and illustrated different feeding behaviour between the cryptic species, with Pm3 exhibiting a higher degree of selective feeding than Pm1. Morphologically similar species belonging to the same feeding guild (bacterivores) can thus have substantial differences in their associated microbiomes and feeding strategy, which in turn may have important ramifications for biodiversity-ecosystem functioning relationships. PMID:26929004

  19. 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.

  20. Evaluación de la actividad citotóxica, genotóxica y efecto sobre el ciclo celular de fracciones obtenidas a partir de la esponja marina Iotrochota birotulata

    OpenAIRE

    De la Ossa, Andrés Mauricio

    2012-01-01

    Los organismos marinos constituyen una fuente importante de sustancias bioactivas con estructuras novedosas y con propiedades biológicas y farmacológicas potenciales.En este trabajo se evaluaron los efectos citotóxicos, genotóxicos y sobre el ciclo celular con las pruebas de azul de Tripano, MTT, ensayos de clonación, intercambio de cromatides hermanas (ICH), ensayo cometa (SCGE) y función de acumulación respectivamente de dos fracciones obtenidas de la esponja marina Iotrochota birotulata (c...

  1. Proyecto básico de ampliación del Puerto deportivo Pobla Marina. Ampliación del muelle de Poniente y obras de dragado (T.M. Puebla de Farnals, Valencia)

    OpenAIRE

    LLORENS BUFORT, MARIA

    2016-01-01

    [ES] El presente proyecto denominado 'Proyecto básico de ampliación del Puerto deportivo Pobla Marina (T.M. Puebla de Farnals, Valencia)' se ha realizado como Trabajo Final de Grado conjunto por dos alumnos. El objetivo es determinar y desarrollar una propuesta para la ampliación de amarres del citado puerto, a nivel de proyecto básico. Esta propuesta tiene como objetivos aumentar la oferta de amarres, ajustar la superficie terrestre para optimizar el espacio y adecuar los servicios a la dema...

  2. Proyecto básico de ampliación del Puerto deportivo Pobla Marina. Servicios y nuevo pantalan para yates de gran porte. (T.M. Puebla de Farnals, Valencia)

    OpenAIRE

    MAHIQUES PÉREZ, MARÍA ANGELES

    2016-01-01

    [ES] El presente proyecto denominado 'Proyecto básico de ampliación del Puerto deportivo Pobla Marina (T.M. Puebla de Farnals, Valencia)' se ha realizado como Trabajo Final de Grado conjunto por dos alumnos. El objetivo es determinar y desarrollar una propuesta para la ampliación de amarres del citado puerto, a nivel de proyecto básico. Esta propuesta tiene como objetivos aumentar la oferta de amarres, ajustar la superficie terrestre para optimizar el espacio y adecuar los servicios a la dema...

  3. Evaluación, gestión y conservación de praderas de fanerógamas marinas en la isla de Gran Canaria, Islas Canarias

    OpenAIRE

    Espino, Fernando

    2014-01-01

    Máster Oficial en Gestión Costera [ES] Las praderas de fanerógamas marinas constituyen uno de los ecosistemas más importantes en muchas zonas costeras del mundo. Desempeñan múltiples e importantes funciones ecológicas y proveen bienes y servicios a los seres humanos. Sin embargo, estos ecosistemas están sufriendo una regresión a escala global, provocada por las actividades que los seres humanos realizan en las costas. En este trabajo, se realiza una comparación en la estructura de 21 prade...

  4. Determinación de los factores que inciden en la captura incidental de aves marinas en la flota palangrera pelágica chilena Determination of factors affecting the bycatch of seabirds in Chilean pelagic longline fleet

    Directory of Open Access Journals (Sweden)

    Andrés González

    2012-09-01

    Full Text Available Se analizó la relación entre la variabilidad de la tasa de captura incidental de aves marinas en la pesquería palangrera pelágica de pez espada (Xiphias gladius y diversos factores temporales, ambientales, espaciales y pesqueros, entre 2007 y 2009. Los resultados muestran que las operaciones de pesca de esta flota afectan principalmente a los albatros, grupo que concentra el 83,7% de la captura incidental de aves marinas registrada en el período. Esta captura incidental se debe en primera instancia a la presencia del Frente Subtropical del Pacífico Sur, sistema que provoca la sobreposición entre la actividad de esta flota con la distribución espacial de aves marinas durante la fase residente del período no reproductivo. La variabilidad en esta captura incidental estaría fuertemente relacionada a los estímulos visuales (medido mediante el porcentaje de luces químicas y porcentaje de calamar y las condiciones de luminosidad ambiental existentes en los períodos de forrajeo diurno y nocturno de estas aves marinas durante el calado (medido a través del desfase de la hora del ocaso con respecto a la hora de inicio del calado y fase lunar.We analized the relationship between the variability in the rate of seabird bycatch in pelagic longline fishery for swordfish (Xiphias gladius, and several temporary, environmental, spatial and fisheries factors for the fishing period from 2007 to 2009. The results show that the fishing operations of this fleet mainly affect the albatross, group that accounts for 83.7% of the incidental catch of seabirds recorded in the period. This bycatch is due primarily to the presence of the South Pacific Subtropical Front, a system that causes the overlap between the activities of this fleet with the spatial distribution of these seabird species during the resident phase of the nonbreeding period. By the other hand, the variability in bycatch would be strongly linked to visual stimuli (measured by the percentage of

  5. Evaluación in vitro del potencial citotóxico, genotóxico y efecto en el ciclo celular de extractos de tres especies de esponjas marinas del Caribe colombiano / Evaluation in vitro of cytotoxic and genotoxic potential, and the effect on the cell cycle of extracts from three species of sea sponge from the colombian Caribbean

    OpenAIRE

    Navia Morocho, Heidy Catalina

    2011-01-01

    Los organismos marinos han revelado ser una fuente importante de sustancias bioactivas, las cuales en muchos casos producen como mecanismos de defensa. Colombia cuenta con una gran diversidad biológica marina y con posibilidades de explotar alternativas naturales en la búsqueda de nuevos productos terapéuticos. Dada las escasas investigaciones que permitan detectar sustancias bioactivas de esponjas marinas; se consideró de interés realizar esta investigación con el fin de evaluar in vitro el ...

  6. El papel de la membrana corioalantoídea en la retención de contaminantes organoclorados (plaguicidas) y su relación con otras variables ambientales: sedimentos y plasma de tortuga marina golfina (Lepidochelys olivacea) de Baja California Sur, México.

    OpenAIRE

    Sergio Rosales Ledezma; Orlando Lugo Lugo; Tania Zenteno Zavín; Lia Celina Méndez Rodríguez

    2011-01-01

    Se ha sugerido que las tortugas al consumir sus alimentos, como algas, sargazo y vegetación marina pueden ingerir agua y sedimentos contaminados por compuestos órganoclorados (OCs). También se considera que la exposición a los bifenilos policlorados (PCBs) por parte de las tortugas marinas es de manera directa y la transferencia de estos contaminantes se daría desde la madre hacia los huevos y posiblemente perturbar el nacimiento de las crías. La acumulación de los OCs en los huevos de aves y...

  7. 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

  8. Co-ocurrencia de Chattonella marina y Gymnodinium catenatum en la Bahía de La Paz, Golfo de California (primavera 2009 Co-ocurrence of Chattonella marina and Gymnodinium catenatum in Bahía de La Paz, Gulf of California (Spring 2009

    Directory of Open Access Journals (Sweden)

    David Javier López-Cortés

    2011-08-01

    Full Text Available Durante el período del 24 de marzo al 14 de mayo de 2009 en la Bahía de La Paz, se obtuvieron muestras de agua y de red para análisis de fitoplancton. Una alícuota se fijó con una solución de Lugol para la identificación y cuantificación, la de red se utilizó para la identificación in vivo. Semanalmente se midió la temperatura in situ, se determinaron nutrientes inorgánicos y clorofila a en tres estaciones. Se identificaron dos especies: Chattonella marina (Subrahmanyan Y. Hara et Chihara y Gymnodinium catenatum Graham. Chattonella marina fue la especie más abundante con densidades de 14 × 10³ a 36 × 10³ cél. L-1 a nivel sub-superficial. Gymnodinium catenatum se registró con densidades de 1 × 10³ a 19 × 10³ cél. L-1. La temperatura del agua fue homogénea desde la superficie hasta los 20 m de profundidad, con un intervalo de 19.5 a 22.0 °C y de 20.0 a 21.5 °C a finales de marzo y abril respectivamente. En la primera mitad de mayo se inició la estratificación, con una diferencia térmica de 5.0 °C entre la superficie y los 20 m. Los nitratos variaron de 0.5 a 11.0 μM y los ortofosfatos de 0.4 a 2.6 μM. La clorofila a en marzo presentó un valor en superficie de 7.5 mg m-3 y a 20 m de 3.5 mg m-3, en mayo varió de 2.0 a 7.0 mg m-3. Se concluye que la aparición de las dos especies observadas en este estudio se asocia a la disminución de los procesos de mezcla en esta bahía.During the period of 24 March to 14 May 2009, water and net samples were obtained for phytoplankton analyses; one aliquot was fixed in Lugol's solution for species quantification and identification. Net samples were used for the identification of live phytoplankton species. Additionally, temperature in situ, chlorophyll a and inorganic nutrients were measured weekly in three stations. Two species were identified: Chattonella marina (Subrahmanyan Y. Hara et Chihara and Gymnodinium catenatum Graham. Chattonella marina was the most abundant species

  9. 红树林秋茄、桐花树、白骨壤混交生长效果研究%Study on the Growth Effect of Mangrove Kandelia candel,Aegiceras corniculatum and Avicennia marina

    Institute of Scientific and Technical Information of China (English)

    陈世勇

    2014-01-01

    在海滩涂上栽培秋茄、桐花树、白骨壤,经过11a的经营管理,对红树林秋茄、桐花树、白骨壤林木的生长量进行调查分析。结果表明:红树林秋茄、桐花树、白骨壤混交林的林木生长,均比秋茄、桐花树、白骨壤纯林的林木生长效果好。混交林生长的林木树高、胸径、枝下高、树冠,分别比纯林林木生长的树木高大7.69%、7.5%、11.11%,胸径粗2.17%、11.41%、6.67%,枝下高大2.01%、10.95%、8.57%,冠幅大5.00%、10.53%、13.50%。红树林秋茄、桐花树、白骨壤林木在浅潮位生长,比中潮位林木生长效果好,支柱根大、板状根系发达,吸收海水污染物强,能将盐类物质通过叶片光合作用排到植物体外,可去氮和磷等污染物,净化海边环境,防浪护堤,防止海岸侵蚀,起到保护生态环境作用。%The cultivation of Kandelia candel,Aegiceras corniculatum and Avicennia marina in the beach, through the management of 11a,to investigate and analyze the volume growth,the Mangrove Kandelia can-del,Aegiceras corniculatum,Avicennia marina trees. The results show that:Kandelia candel,Aegiceras cornic-ulatum,Avicennia marina,mixed forest tree growth,than Kandelia candel,Aegiceras corniculatum,Avicennia marina,pure forest growth effect is good. Mixed forest trees tree height,DBH,height under branch,crown,re-spectively than those of pure forest grown trees tall and 7.69%,7.5%,11.11%,2.17%,11.41%,6.67% in di-ameter,branch 2.01%,tall 10.95%,8.57%,5%,10.53%,13.50% crown. Kandelia candel,Aegiceras cornicula-tum,Avicennia marina in the shallow water,tree growth,than the tide in forest growth effect is good,the prop roots,plate-like roots,absorb water pollutants can be strong,salts,row to plants in vitro through photo-synthesis,can go to nitrogen and phosphorus and other pollutants,purification of sea environment,anti wave support the waves,coastal erosion,to protect the ecological environment

  10. 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

  11. Efecto de extracto de algas marinas sobre parámetros productivos de la cachama blanca (Piaractus brachypomus: ensayos en laboratorio y a escala comercial

    Directory of Open Access Journals (Sweden)

    Gloria Gutiérrez-Yara

    2009-06-01

    Full Text Available Con el fin de evaluar los posibles efectos de la administración de un extracto de algas marinas (EAM, sobre parámetros productivos de la cachama blanca (Piaractus brachypomus, 8994 dedinos de 7 ± 3 g de peso corporal y 6.8 ± 0.7 cm de longitud total, fueron utilizados para realizar ensayos a nivel de laboratorio y a escala comercial. Tanto a nivel de laboratorio (42 d como a escala comercial (150 días, utilizando un diseño completamente al azar, se evaluaron 4 tratamientos: TTO1 (control, TTO2 (EAM vía oral por 42 o 30 días, TTO3 (EAM inyectado 0.2 mL/pez, vía IP y TTO4 (EAM inyectado 0.2 mL/pez vía IP, más EAM vía oral por 42 o 30 días. La presentaciónoral del extracto fue suministrada mezclada con el alimento (30% PB en una proporción de 1 %, durante 42 o 30 días, a nivel de laboratorio o a escala comercial, respectivamente. A escala comercial, el peso corporal y la longitud total se evaluaron cada 15 días, muestreando c.a 10% de la población de cada réplica. Al final de los dos experimentos se evaluó la ganancia de peso corporal (GPC, tasa de crecimiento específica en peso (TCEP y en longitud (TCEL, factor de condición relativo (Kn, conversión alimenticia (CA y porcentaje de sobrevivencia (%S. En general, los resultados no revelaron diferencias significativas entre los tratamientos; sin embargo, a escala comercial, algunas variables productivas en los tratamientos que recibieron EAM vía oral, mostraron una tendenciaa ser superiores que los individuos control, especialmente durante el periodo que duró la administración del extracto. Adicionalmente, durante los primeros 45 d de cultivo, el GPC, TCEP y TCEL fueron mejores que el grupo control, sugiriendo que puede existir un posible efecto de la inmunoestimulación sobre estas variables.

  12. Vsem Zhivagam Zhivago / Marina Suranova

    Index Scriptorium Estoniae

    Suranova, Marina

    2006-01-01

    10. mail algas Venemaa telekanalil NTV Aleksander Proshkini 11-osaline seriaal Boriss Pasternaki romaani "Doktor Zhivago" ainetel, kesksetes rollides Oleg Menshikov, Tshulpan Hamatova, Oleg Jankovski. Lavastaja A. Proshkin ning Komarovski osatäitja Oleg Jankovski kõnelevad rõhuasetustest uues ekraniseeringus

  13. Angelski tsikl : [luuletused] / Marina Kutshinskaja

    Index Scriptorium Estoniae

    Kutshinskaja, Marina

    2003-01-01

    Sisu: "Ja znaju dom, v kotorom tõ zhivjosh..." ; "Tõ, mne davshi bolshije krõlja..." "Tajet sini janvar bestolkovo i põshno..." ; Verbnoje voskressenje ; Vigilia ; "Ishtshu naprasno - v oblakahh..." ; "Tõ mnoju zabõt, nezadatshlivõi angel..."

  14. Conectividad entre comunidades de decápodos asociadas a fondos infralitorales de algas y fanerógamas marinas. "Cuando pequeños fragmentos hacen un todo"

    OpenAIRE

    Mateo-Ramírez, A. (Ángel)

    2014-01-01

    La diversidad de especies es, de forma general, mayor en fondos con cobertura vegetal (p.e. fanerógamas marinas, algas fotófilas) que en fondos blandos sin vegetación, por lo que una pérdida parcial de pradera debería traer consigo una pérdida de diversidad. Sin embargo, el efecto de la fragmentación del hábitat dependerá de varios factores, incluyendo el número y tamaño de los parches, la distancia entre ellos y los tipos de hábitats próximos. En este trabajo se ha analizado este...

  15. 大型水生植物对海洋卡盾藻生长的抑制效应%Imhibitory Effects of Macrophytes on Growth of Chattonella marina

    Institute of Scientific and Technical Information of China (English)

    么强; 宫春光; 安鑫龙

    2012-01-01

    [Objective]The aim was to study the inhibitory effects of Eichnornia crassipes, Gracilaria lemaneiformis and N-phenyl 2-naphtyyl-amine on growth of C.marina.[Method]E.crassipes root dry power concentration was 0,0.1,0.5,1.O,1.5 g/L respectively,G.lemaneiformis fresh tissue concentration was 0,0.1,0.5,1.0,2.O g(FW)/L,and N-phenyl 2-naphthylamine concentration was 0,0.5,1.0,5.O,10.0 mg/L.[Result]The results showed that growth of C. Marina which was initial concentration was 1.6 ×106 cell/L was inhibited apparently when the concentration of E. Crassipes roots dry powder were 1.0 and 1.5 g/L,the concentration of N-phenyl 2-naphthylamine was 1.0,5.0,10.0 mg/L and the concentration of G.lemaneiformis fresh tissue was 2.0 g(FW)/L.[Conclusion]The study lays a basis for deeply researching the effects of E.crassipes and G.Lemaneiformis on growth of C.marina.%[目的]研究凤眼莲根(Eichnornia crassipes)、龙须菜(Gracilaria lemaneiformis)和N-苯基-2-蔡胺对海洋卡盾藻(Chattonella marina)生长的抑制效应.[方法]凤眼莲根粉末浓度分别设为0、01、0 5、1 0、1.5 g/L,龙须菜新鲜组织浓度分别设为0、0.1、0 5、1.0、2.0g(FW)/L,N-苯基-2-蔡胺浓度分别设为0、0.5、1.0、5 0、10.0 mg/L.[结果]1 0、1.5g/L凤眼莲根粉末,1 0、5.0和10.0 mg/L N-苯基-2-萘胺及2.0g(FW)/L龙须菜新鲜组织对起始密度为1.6×106个/L的海洋卡盾藻生长表现出明显的抑制作用.[结论]该研究可为进一步研究凤眼莲和龙须菜对海洋卡盾藻生长的影响奠定基础.

  16. Sedimentitas marinas de la Formación Barranca Final (Mioceno medio-superior de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina

    Directory of Open Access Journals (Sweden)

    G. Visconti

    2003-06-01

    Full Text Available En este trabajo se describen sedimentitas carbonáticas, silicoclásticas y evaporíticas del Mioceno de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina. Sobre la base de la litología, las estructuras sedimentarias y los fósiles se identificaron siete facies y dos asociaciones de facies, correspondientes a ambientes marino somero (intermareal a supramareal y fluvial, para las secciones analizadas. Las sedimentitas marinas infrayacen a las areniscas fluviales de la Formación Río Negro y se consideran correlacionables con las sedimentitas de la Formación Barranca Final (Mioceno medio-superior, depositadas en la cuenca del Colorado durante la transgresión "Entrerriense". El hallazgo de estos niveles confirma la presencia de este mar en el sureste de la provincia de La Pampa.

  17. Estimación de la cota de inundación como herramienta para la conservación de las tortugas marinas en el pacífico colombiano.

    OpenAIRE

    Peláez Zapata, Daniel S.; Osorio Arias, Andrés Fernando; Álvarez Silva, Oscar Andrés; Osorio Cano, Juan David; Payán, Luis

    2012-01-01

    Playa Palmeras está ubicada en el Parque Nacional Natural (PNN) Isla Gorgona en el Pacífico Colombiano; es uno de los sitios más importantes para la anidación de tortugas marinas en América del Sur y Centroamérica. Debido a procesos morfológicos que afectan la playa, los nidos de las tortugas se ven cada vez más expuestos al impacto del oleaje y la marea, poniendo en riesgo la conservación de éstas especies. En éste estudio se estimó la probabilidad de excedencia de la cota de inundación en P...

  18. Modelo matemático para el transporte de toxinas en una red trófica marina / A mathematical model for toxins transport in a marine food web

    OpenAIRE

    Arbeláez Alvarado, Daniel

    2011-01-01

    Algunos casos de intoxicación ocasionados por el consumo de peces tóxicos se han reportado en los últimos años en varias regiones insulares de países tropicales. Problemas gastrointestinales, cardiovasculares y neurológicos están entre los síntomas más comunes de la ciguatera, enfermedad que afecta negativamente la economía de países del Caribe y el Pacífico que dependen de la pesca y el turismo. Con el propósito de entender el transporte de biotoxinas en la red trófica marina, proponemos ...

  19. Los colores de las conchas marinas en el antiguo occidente de México. El caso del Posclásico Seashell color in ancient western Mexico. The case of the Postclassic

    Directory of Open Access Journals (Sweden)

    Luis Gómez-Gastélum

    2007-10-01

    Full Text Available A partir de los estudios sobre la cosmovisión mesoamericana -en especial aquellos relacionados con el cuerpo humano y las significaciones del color-, se analizan los patrones de uso de las conchas marinas y los objetos elaborados con éstas en las sociedades prehispánicas del occidente de México durante el periodo Posclásico (1100-1350 d.C., con la finalidad de acercarse al simbolismo que les fueron otorgados por parte de quienes las utilizaron.Based on studies of Mesoamerican cosmology, especially with regard to the human body and the meaning of color, we analyzed the use patterns of seashells and objects made from seashells in the Pre-Hispanic societies of western Mexico in the Postclassic period (1100-1530 A.D.. The goal was to understand the symbolism given to these objects by the people who utilized them.

  20. Il rudere della chiesa di Santa Lucia alla Marina di Cagliari. Architettura, archeologia e storia dell’arte per il recupero di un luogo della città medievale

    Directory of Open Access Journals (Sweden)

    Marco Cadinu

    2012-06-01

    The Saint Lucia church, located in the Marina suburb of Cagliari, is a ruin. To conserve the monument, an important effort is needed to understand the history of its architecture, a hypothetical previous church, and the cultural stratification of the surrounding area. The few architectural elements that still exist from the 17th century reconstruction interpret a characteristic late Renaissance and Controriforma style. In middle age the Santa Lucia site was in a strategic position, located close to the merchants port and the possessions of the Archbishop and the Judges of Cagliari. Ancient documents and modern analyses reveal a new image of Santa Lucia and its cultural impact. This study precedes the imminent archaeological excavation of the medieval strata and, later, the underlying Roman town.

  1. Olaf Kapella, Christiane Rille-Pfeiffer, Marina Rupp, Norbert F. Schneider (Hg.: Die Vielfalt der Familie. Tagungsband zum 3. Europäischen Fachkongress Familienforschung. Opladen u.a.: Verlag Barbara Budrich 2009.

    Directory of Open Access Journals (Sweden)

    Isabelle Josephine Kürschner

    2011-03-01

    Full Text Available Der im Anschluss an die 3. Europäische Fachkonferenz für Familienforschung erschienene Sammelband Die Vielfalt der Familie von Olaf Kapella, Christiane Rille-Pfeiffer, Marina Rupp und Norbert F. Schneider greift wichtige Trends in der jüngeren Entwicklung familialen Zusammenlebens in Europa auf. Neben der Formenvielfalt und Dynamik werden unterschied-liche nationale und internationale Rahmenbedingungen und entsprechende Entwicklungen ins Blickfeld genommen.This anthology contains the presentations of the third European symposium on Family Research in June 2008. The articles illustrate from various research perspectives how families live together in modern Europe and what family means today. In addition to the variety of forms and dynamic, various national and international parameters and their respective developments are analyzed.

  2. Marina Núñez o la construcción de un cíborg. Un discurso multimedia entre la utopía y la distopía

    Directory of Open Access Journals (Sweden)

    Isabel Tejeda Martín

    2012-04-01

    Full Text Available El presente artículo se propone revisar, a partir de un número importante de entre los proyectos multimedia más importantes realizados en las dos últimas décadas por la artista española Marina Núñez Jiménez (Palencia, 1966, la construcción que ha llevado a cabo de alegorías sobre el concepto de cíborg, tanto en su sentido utópico como distópico. Se analiza, en este sentido, el reciclaje que esta artista hace en su trabajo con los referentes religiosos católicos de la historia del arte, estudiando en concreto su intervención Carne para la sala de exposiciones de Verónicas, un espacio connotado de arquitectura barroca que en su tiempo fue una iglesia conventual.Nos basaremos en sus exposiciones entendidas como site-specific, en sus instalaciones, cajas de luz, vídeos y fotografías, imágenes que serán analizadas desde una perspectiva iconográfica, técnica y lingüística casi en su totalidad. Asimismo, estos trabajos se ponen en relación con los referentes críticos más importantes de la autora, Michel Foucault, Donna Haraway, Rosi Braidotti, etc.El artículo traza un recorrido por la literatura crítica existente sobre esta Marina Núñez aparecida tanto en revistas especializadas como en forma de textos de catálogos individuales, al tiempo que refiere sus profundas relaciones formales e iconográficas con la literatura Cíberpunk y con el cine de ciencia ficción.

  3. Cloning, expression, and purification of a sesquiterpene cyclase from geosmin-producing Oscillatoria splendida

    Science.gov (United States)

    The aquaculture industry is a growing part of agriculture worldwide. Many of these systems, primarily closed ones, encounter serious issues with off-flavors. Cyanobacteria are the main producers of the two dominant off-flavor compounds, geosmin and 2-methylisoborneol. In an effort to begin to und...

  4. 盐度对大叶藻种子萌发和幼苗发育的影响%The effects of salinity on seed germination and seedling development of the seagrass,Zostera marina L

    Institute of Scientific and Technical Information of China (English)

    刘云龙; 张学雷

    2016-01-01

    Critical habitats of Zostera marina beds have greatly declined and request studies of effective method(s) for rehabilitation.Seeds of Z.marina were collected from Sanggou Bay,Dongchudao,Rongcheng,Shandong,Chi-na,and the effects of acute salinity variation (0-30)on the seed germination and seedling development were stud-ied in the laboratory,to provide information for the rehabilitation of seagrass bed with seed reproduction.The re-sults showed that lowering salinity induced the germination rate of Z.marina seeds,with significance occurred at salinities 15 and lower,and the highest germination rate at salinity 0.Seeds germinated at salinities 0,5 and 15 could develop into seedlings and survive,with the percentage and time period influenced by both germination salini-ty background and post-germination incubation salinity:(1 )higher germination salinities promoted germinated seeds developing into seedlings and surviving better,(2)seedlings were established and continued growth and fur-ther development at post-germination incubation salinities 5-30,while 100% mortality occurred after various de-velopment at salinity 0 or 1.Seedling leaves presented net production of oxygen at salinities 5-30,with a trend of higher gross and net production of oxygen and higher respiration rates at higher salinities.The results indicated that Z.marina seeds could produce 24% or 12% of health seedlings within two months treatment of acute salinity variation,germinating at salinities 0 or 5 and developing at salinities 5-30,which presented a practical method of seagrass bed rehabilitation with Z.marina seeds.%大叶藻海草场是重要生境但在我国严重退化,亟需研究有效的修复方法。本文以桑沟湾的大叶藻种子为研究对象,探讨了盐度急变(0~30)对种子萌发、萌发后继续发育和存活及幼苗幼叶的光合与呼吸速率的影响,为以种子繁殖修复大叶藻海草场提供参考。结果表明:盐度降

  5. 大叶藻居群微卫星遗传多样性研究%GENETIC DIVERSITY IN POPULATIONS OF ZOSTER MARINA L.INFERRED FROM NUCLEAR SSR MARKERS

    Institute of Scientific and Technical Information of China (English)

    孙典荣; 李渊; 李文涛; 高天翔

    2013-01-01

    Seagrasses are angiosperms that are thought to have become adaptive to aquatic environment independently. The marine, monocotyledonous Zostera marina is a species of Zosteraceae using traditional classifications, which widely distributes from subtropical to subfrigid coastal oceans. Seven natural populations of Z. marina (Lidao, Tian'ehu, Qingdao Bay, Dalian, Naepo, Tokyo Bay and Finavarra) were used in this study. To study the mechanism of the genetic diversity and population structure of the seven populations, microsatellite marker (SSR) analysis was done. A total of 57 alleles were identified in 148 individuals across the four microsatellite primers analyzed, with a mean value of 6 alleles per locus. The mean expected heterozygosity (He) and observed heterozygosity (Ho) across all populations were 0.687 and 0.417, respectively, and a higher level of diversity was found in the population from the Qingdao Bay (A=l.750, AR=1.043) than other populations. The minimum Fst value was 0.051 between the populations from the Qingdao Bay and Dalian. The maximum Fsl value was 0.261 between the populations from Tian'ehu and Finavarra. The Fsl values suggested moderate genetic differentiation within most of the Z. marina populations. From the UPGMA tree, four populations in China (Lidao, Tian'ehu, Qingdao Bay and Dalian) clustered together, and the genetic relationships may be attributed to eelgrass meadow fragmentation. The geographic distance was responsible for the genetic differentiation from large-scale among populations in China (Lidao, Tian'ehu, Qingdao Bay and Dalian), Korea (Naepo), Japan (Tokyo Bay) and Ireland (Finavarra). Results of possible number of clusters supported that this seagrass species originated from East Asia. The population from the Qingdao Bay has higher genetic diversity, suggesting that populations in this region demand prioritized conservation and utilization for breeding programs.%采用4对微卫星引物对大叶藻的7个地理居群进行了

  6. Stranded Zostera marina L. vs wrack fauna community interactions on a Baltic sandy beach (Hel, Poland: a short-term pilot study. Part I. Driftline effects of fragmented detritivory, leaching and decay rates

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    Marcin F. Jêdrzejczak

    2002-06-01

    Full Text Available The effects of the beach community structure of macro- and meiofauna on the process of beach wrack decay were investigated by means of a simple field colonisation experiment in a temperate, fine quartz sediment, sandy beach at the end of the Hel Peninsula in Poland. 1260 replicate litterbags of three mesh sizes (12 mm, 0.5 mm, 48 µm containing fresh wrack were used to assess the role of faunal and non-faunal components in the breakdown of stranded Zostera marina. Wrack breakdown was determined during a three-year field study. This paper presents the first part of the results of this field experiment, which refer to the effects of fragmentation detritivory, leaching and decay rates. Material was lost from the bags at a rapid rate, with only 22-32% of the original dry mass remaining after 27 days in the field. This degradation was not directly related to the faunal succession of the eelgrass tissue, which proceeded in two distinct phases throughout the study period. Exclusion of macrofauna from the wrack by the use of finer-mesh litterbags (< 1 mm had no appreciable effect on the rate of dry matter loss. Microbial decay, and abiotic leaching and fragmentation are probably the major causes of seagrass weight loss from the litterbags.

  7. 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

    Directory of Open Access Journals (Sweden)

    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.

  8. Aplicación de la Tecnología SIG para la representación de información climática marina en el Atlántico Sur Application Of Gis Technology For The Representation Of Climate Marine Information In The South Atlantic Region

    Directory of Open Access Journals (Sweden)

    Elisa C. Nuré

    2011-06-01

    Full Text Available Este trabajo presenta una aplicación de la tecnología de Sistemas de Información Geográfica (SIG a las bases de datos de información meteorológica marina generadas en función de procedimientos estadísticos recomendados por la Organización Meteorológica Mundial para la elaboración de Resúmenes Climáticos Marinos. Este SIG permite una visualización dinámica de valores extremos y frecuencias en forma de mapas, tablas y gráficos, tanto temporales como espaciales, así como de la distribución de las observaciones meteorológicas marinas en el Océano Atlántico Sudoccidental. La información climática regional marina elaborada utilizando esta tecnología, es de interés para toda ciencia o disciplina relacionada con el medio ambiente y constituye un valioso soporte para la planificación de tareas en el ámbito de la seguridad náutica, tanto para el Servicio de Hidrografía Naval como para otras instituciones que desarrollen actividades afines.This article shows a Geographic Information Systems (GIS application to marine climatic information data bases. These data bases are created following the World Meteorological Organization recommendations for applying statistical procedures to marine observations in order to elaborate Marine Climatic Summaries. This GIS allows a dynamic visualization of maps, tables and graphics showing extreme values and frequencies of meteorological variables in time and space as well as the marine meteorological observations distribution over the South Atlantic Ocean. The regional climatic marine information obtained using this technology, will be a useful tool for environmental related disciplines and, it will be also of valuable support for the safety of naval operations.

  9. 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

  10. Efecto de la radiación ultravioleta B en la producción de polifenoles en la microalga marina Chlorella sp. Effect of ultraviolet B radiation on the production of polyphenols in the marine microalga Chlorella sp.

    Directory of Open Access Journals (Sweden)

    Jaime Copia

    2012-03-01

    Full Text Available Las algas marinas son una fuente importante de compuestos antioxidantes (fenoles y polifenoles, generados como mecanismos de defensa frente a factores de estrés (radiación UV, temperatura, herbívora. El objetivo de este trabajo es evaluar la estrategia de adaptación al efecto de la radiación ultravioleta B (RUV-B, 280-315 nm en la microalga marina Chlorella sp. mediante la producción de polifenoles y capacidad antioxidante total. Se expusieron cultivos de Chlorella sp. fueron expuestos a radiación UV-B (470 μW cm-2 por periodo de tiempos ascendentes. Se evaluó la capacidad antioxidante total DPPH, polifenoles totales, clorofila-a y b así como la densidad celular en cultivos expuestos y no expuestos. Los resultados indicaron que la RUV-B genera una disminución de la densidad celular en los cultivos irradiados por primera vez (1ª etapa, existiendo un aumento significativo (P Marine algae are an important source of antioxidant compounds (phenols and polyphenols, generated as defense mechanisms against stress factors (UV radiation, temperature, herbivory. The aim of this study was to evaluate the strategy of adaptation to the effect of ultraviolet B radiation (UV-B, 280-315 nm in the marine microalga Chlorella sp. through, the production of polyphenols and total antioxidant capacity. Chlorella sp. cultures were exposed to UV-B radiation (470 μW cm-2 over increasing time periods. We evaluated the total antioxidant capacity DPPH, total polyphenols, chlorophyll-a and b, and cell densities in exposed and unexposed cultures. The results indicated that UV-B caused a decrease in cell density in cultures irradiated for the first time (1st stage, with a significant increment (P < 0.05, lower than the control in the 2nd and 3rd stages only through the 4th stage (day 7, corresponding to a dose of 16,920 J m-2. The production of total phenols increased significantly (P < 0.05 for the IVth extract with respect to the control, confirming that the

  11. Stress proteins and auxiliary anti-stress compounds in intertidal macroalgae Proteínas de estrés y compuestos anti-estrés auxiliares en algas marinas intermareales

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    Edgardo Cruces

    2012-11-01

    Full Text Available Intertidal macroalgae are exposed to strong variation in the physical environment and thus, diverse anti-stress mechanisms are displayed by these organisms. Stress proteins (also called heat shock proteins, HSPs have been invoked as potential protective mechanism, especially during stressful action of temperature and solar radiation. Therefore, macroalgae have not normally been used as model organisms in studies of these molecules. The present study compiles the existing information from intertidal species in the context of major factors that have been reported to induce them, e.g. temperature, enhanced solar radiation, contaminants, etc. Additionally, in order to address the question whether the expression of these proteins operates in intertidal macroalgae complementarily with other protective mechanisms, a case study of induction of HSPs after exposure to UV radiation and high temperature in two upper littoral species, Ulva sp. and Porphyra columbina, from southern Chile is presented. In parallel, two well-known responses to stress, photoinhibition of photochemical reactions (Fv/Fm and ROS scavenging were measured. The results indicated that, although stress proteins were detected in a time span between 3 and 24 h, the responses were not correlated with photochemical and antioxidative response. Overall, the study outlines a potential role of stress proteins in ecophysiological responses developed to cope mainly with high temperature and UV radiation. However, other rapid metabolic adjustments (e.g. high thermo-tolerance of photosynthesis and efficient ROS scavenging, together with other biomolecules (mycosporines, phenols, polyamines, etc. and morpho-functional adaptations to the intertidal life (e.g. small size, high area/volume ratio are also important.Las macroalgas marinas intermareales están expuestas a extrema variación en las condiciones ambientales y por ello desarrollan una serie de mecanismos anti-estrés. Las proteínas de estr

  12. De Las Vegas a Marina D'or. O como llegar desde el New Jornalism norteamericano de Hunter S. Thompson hasta la nueva narrativa española de Robert Juan-Cantavella

    Directory of Open Access Journals (Sweden)

    María Angulo Egea

    2011-12-01

    Full Text Available The north-american trend called 'New Journalism' born in the 60's, was a revolution for the USA traditional Journalism, for its use of literary elements with other ones that belong to the journalistic research. Hunter S. Thompson, author of Fear and loathing in Las Vegas (1971, with his gonzo style, was going to shed new light on the New Journalism proposals, improving the immersión process using drugs until he gets implied personally in his reports and taking all his narrative influences from the 50's beat movement. Almost 35 years later, in El Dorado, Juan-Cantavella makes a paralellism between Las Vegas and the holiday city in the mediterranean coast, Marina D'Or and he develops in this space a novel, where his alter ego, the punk journalist Escargot, plays the lead. Novel, journalism, gonzo, fiction, story, punk, essay, report, 'aportaje', discursive fragmentation, dialogs, internal monologues, descriptions, memorandums, telegrams, emails, press releases, radio news, songs, slogans, all fits to reenact genres, to re-read journalistic and literary traditions and to build something new. This work analyses this process, that goes from the gonzo journalism of Fear and loathing in Las Vegas to the current Spanish narrative of El Dorado. It tries to distinguish the literary resources that the gonzo journalist uses to build his reports and the journalistic tools that nourish Juan-Cantavella's 'punk narrative'. A particular example of literary-journalistic symbiosisLa corriente norteamericana llamada 'Nuevo periodismo', nacida en los años sesenta, supuso para la Periodística tradicional de Estados Unidos toda una revolución por la combinación de elementos literarios con otros propios de la investigación periodística. Hunter S. Thompson, autor de Miedo y asco en las Vegas (1971, con su periodismo gonzo, le iba a dar una vuelta más a la propuesta del New Journalism, llevando al extremo el proceso de inmersión, hasta implicarse personalmente

  13. 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

  14. Exploiting COSMO-Skymed Data and Multi-Temporal Interferometry for Early Detection of Landslide Hazard: A Case of Slope Failure and Train Derailment Near Marina Di Andora, Italy.

    Science.gov (United States)

    Wasowski, J.; Chiaradia, M.; Bovenga, F.; Nutricato, R.; Nitti, D. O.; Milillo, G.; Guerriero, L.

    2014-12-01

    The improving temporal and spatial resolutions of new generation space-borne X-Band SAR sensors such as COSMO-SkyMed (CSK) constellation, and therefore their better monitoring capabilities, will guarantee increasing and more efficient use of multi-temporal interferometry (MTI) in landslide investigations. Thanks to their finer spatial resolution with respect to C-band data, X-band InSAR applications are very promising also for monitoring smaller landslides and single engineering structures sited on potentially unstable slopes. This work is focused on the detection of precursory signals of an impending slope failure from MTI time series of ground deformations obtained by exploiting 3 m resolution CSK data. We show the case of retrospectively captured pre-failure strains related to the landslide which occurred on January 2014 close to the town of Marina di Andora. The landslide caused the derailment of a train and the interruption of the railway line connecting north-western Italy to France. A dataset of 56 images acquired in STRIPMAP HIMAGE mode by CSK constellation from October 2008 to May 2014 was processed through SPINUA algorithm to derive the ground surface deformation map and the time series of displacement rates for each coherent radar target. We show that a cluster of moving targets coincides with the structures (buildings and terraces) affected by the 2014 landslide. The analysis of the MTI time series further shows that the targets had been moving since 2009, and thus could have provided a forewarning signal about ongoing slope or engineering structure instability. Although temporal landslide prediction remains difficult even via in situ monitoring, the presented case study indicates that MTI relying on high resolution radars such as CSK can provide very useful information for slope hazard mapping and possibly for early warning. Acknowledgments DIF provided contribution to data analysis within the framework of CAR-SLIDE project funded by MIUR (PON01_00536).

  15. Assessment of sediment quality in Avicennia marina-dominated embayments of Sydney Estuary: the potential use of pneumatophores (aerial roots) as a bio-indicator of trace metal contamination.

    Science.gov (United States)

    Nath, Bibhash; Birch, Gavin; Chaudhuri, Punarbasu

    2014-02-15

    Currently, coastal intertidal environments are under stress from increased contaminant loads due to urbanization and other anthropogenic disturbances. Mangrove habitats are abundant in tropical and sub-topical intertidal zones and frequently act as a metal bio-filter in estuarine systems. Mangrove reforestation is often considered as one of the management options to protect estuarine-marine habitats. The main objective of the present investigation was to assess the bio-indicator potential of Avicennia marina by determining heavy metal concentrations in pneumatophore (aerial root) tissues and ambient sediments from Sydney Estuary (Australia). We collected mangrove sediments and pneumatophores in fifteen locations covering five major embayments of the estuary for a detailed biogeochemical investigation. Metal concentrations in sediment were mostly above Australian interim sediment quality guidelines (ISQG)-Low and in few instances above ISQG-High values. Enrichment factors (EFs >6, especially of Cu, Pb and Zn) suggest "very severe" modification of sediment in Sydney Estuary in all but one embayment which was mainly due to rapid changes in land use in connection with urbanization. High bio-concentration factors (BCFs) were observed for Cu and Ni in comparison with other metals (i.e., As, Cd, Co, Cr, Pb and Zn). A strong, positive relationship between metals in sediments and pneumatophores suggests potential use of these tissues as a bio-indicator of estuarine contamination and that metals are entering the biotic environment. The study further highlights a positive role of mangroves in sequestering metals from sediments and the water column and thus protecting estuarine environments from pollution.

  16. Assessment of sediment quality in Avicennia marina-dominated embayments of Sydney Estuary: the potential use of pneumatophores (aerial roots) as a bio-indicator of trace metal contamination.

    Science.gov (United States)

    Nath, Bibhash; Birch, Gavin; Chaudhuri, Punarbasu

    2014-02-15

    Currently, coastal intertidal environments are under stress from increased contaminant loads due to urbanization and other anthropogenic disturbances. Mangrove habitats are abundant in tropical and sub-topical intertidal zones and frequently act as a metal bio-filter in estuarine systems. Mangrove reforestation is often considered as one of the management options to protect estuarine-marine habitats. The main objective of the present investigation was to assess the bio-indicator potential of Avicennia marina by determining heavy metal concentrations in pneumatophore (aerial root) tissues and ambient sediments from Sydney Estuary (Australia). We collected mangrove sediments and pneumatophores in fifteen locations covering five major embayments of the estuary for a detailed biogeochemical investigation. Metal concentrations in sediment were mostly above Australian interim sediment quality guidelines (ISQG)-Low and in few instances above ISQG-High values. Enrichment factors (EFs >6, especially of Cu, Pb and Zn) suggest "very severe" modification of sediment in Sydney Estuary in all but one embayment which was mainly due to rapid changes in land use in connection with urbanization. High bio-concentration factors (BCFs) were observed for Cu and Ni in comparison with other metals (i.e., As, Cd, Co, Cr, Pb and Zn). A strong, positive relationship between metals in sediments and pneumatophores suggests potential use of these tissues as a bio-indicator of estuarine contamination and that metals are entering the biotic environment. The study further highlights a positive role of mangroves in sequestering metals from sediments and the water column and thus protecting estuarine environments from pollution. PMID:24345861

  17. Feasibility Study of Economics and Performance of Solar Photovoltaics at the Former Fort Ord Army Base Site in Marina, California. A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America's Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites

    Energy Technology Data Exchange (ETDEWEB)

    Stoltenberg, B.; Konz, C.; Mosey, G.

    2013-05-01

    The U.S. Environmental Protection Agency (EPA), in accordance with the RE-Powering America's Land initiative, selected the Former Fort Ord Army Base (FOAB) site in Marina, California, for a feasibility study of renewable energy production. The National Renewable Energy Laboratory (NREL) provided technical assistance for this project. The purpose of this report is to assess the site for a possible photovoltaic (PV) system installation and estimate the cost, performance, and site impacts of different PV options. In addition, the report recommends financing options that could assist in the implementation of a PV system at the site.

  18. Producción fotosintética de etanol por la cianobacteria Synechocystis sp. PCC 6803

    OpenAIRE

    Vidal Vidal, Rebeca

    2010-01-01

    La preocupación en el ámbito mundial por el calentamiento del planeta, unida al agotamiento de las reservas de petróleo ha generado un gran interés en los últimos años por las fuentes de energía alternativas (Hoffert et al., 2002). Casi una tercera parte de la energía mundial se emplea en el transporte, por lo que los combustibles destinados a este sector constituyen actualmente un objetivo fundamental en las investigaciones destinadas a la reducción de las emisiones de gases de efecto invern...

  19. Antimicrobial and antifouling activities achieved by extracts of seaweeds from Gulf of California, Mexico Actividades antimicrobiana y anti-incrustante obtenidas de los extractos de algas marinas del Golfo de California, México

    Directory of Open Access Journals (Sweden)

    Ruth Noemí Águila-Ramírez

    2012-04-01

    ón mínima inhibitoria (MIC entre 1-10 μg ml-1, frente a las microalgas marinas Rhodosorus magnei, Neorhodella cyanea y Prymnesium calathiferum.

  20. Evaluación de la bioactividad y papel ecológico de los extractos orgánicos crudos de las esponjas marinas Cribrochalina vasculum y Biemna cribaria

    Directory of Open Access Journals (Sweden)

    Arias Hernández Jazmín

    2005-07-01

    Full Text Available La necesidad por obtener una utilidad tangible de los organismos marinos, ha generado un creciente interés por realizar estudios que permitan entender y por lo tanto aprovechar, sus características físicas, biológicas, químicas y ecológicas. La ecología química permite aproximarse a esto,
    por lo tanto, los estudios desarrollados en esta área encierran gran importancia. En el presente estudio se evaluó la actividad de los extractos orgánicos crudos de las esponjas marinas Cribrochalina vasculum y Biemna cribaria, en ensayos de antiepibiosis y disuasión de la alimentación de peces arrecifales generalistas. Estas dos especies mostraron inhibición positiva de la abundancia total, de organismos solitarios, de poliquetos e hidroides; B. cribaria inhibió adicionalmente la abundancia de cianofíceas, cobertura total y cobertura del alga parda. Así mismo, las píldoras preparadas con extracto de C. vasculum no disuadieron a los peces generalistas Stegastes partitus de alimentarse (97,5% de consumo, pero si mostraron rechazo por las píldoras con extracto de B. cribaria (37,5% de consumo. Lo que parece indicar que la esponja B. cribaria está mejor defendida químicamente contra la epibiosis y la depredación, mientras que C. vasculum parece tener un efecto atrayente sobre los peces, por lo que no mostró efectividad en este ensayo. Se propone a B. cribaria como una esponja con posibilidades en la industria de pinturas antiepibióticas, dada su mayor efectividad
    inhibitoria de epibiontes y su baja tasa de lixiviación. Ya que este es un primer acercamiento a la bioactividad de estas dos esponjas, surge la necesidad por continuar estudiando los aspectos ecológicos y químicos de los metabolitos que ellas producen.

  1. Protein (Cyanobacteria): 69702 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available osphatase Oscillatoria sp. PCC 6506 MNHLIKQADLADRIICDSAGTGGYHVGNPPDRRMAIAASKRELELRGSARKFQRSDFENFDLILAMDKDNYQDILSLDPHGKYRDKVRLMCEFCQKYDLREVPDPYYGGPEGFDRVIDLLWDACEGLLEYVTKEKLIFNS ...

  2. Protein (Cyanobacteria): 351371 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available tical protein Oscillatoria sp. PCC 6506 MAGVFFAFSTFVMSALARLQPAQGISAMQAINITAINPLFMTALFGTAAACIFLAISSLLKWHQSAAYLLVGSLLYLVGTVGVTIAFNVPLNDALAIVTPDSTEGANLWARYLTDWTFWNHVRTIAALAASALLTIALCV ...

  3. Protein (Cyanobacteria): 24292 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available in Oscillatoria sp. PCC 6506 MSKIVLLDAGPLGMISHPRNNPEIKFWLENLLRAGISVKVSEVADYEVRRELLRLNKEKGLQRLDNLIDRLGYTPITREVMLKAAEFWADARKQGQPTANNQALDADVILAAQAFTISNQGENTVIATTNVRHLTRFVPAKIWNEIA ...

  4. Protein (Cyanobacteria): 447148 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available tein Oscillatoria sp. PCC 6506 MNRNMKSLPECEEYRSDKKIVLQENKSKITFLNLNQDPILIIKVDGCVISDNETLRCDYALIPYDTVEIYVELKGSDTSQAVKQLESTIRLLSKNPQKIKKLCFVVSTRVPQQATTIQQLQIQFKKKFNASFRIKNIQDEYDLSTCIT ...

  5. Port: arstid kasutavad narkootikume / Marina Lohk

    Index Scriptorium Estoniae

    Lohk, Marina

    2015-01-01

    Tallinna ülikooli terviseteaduste ja spordi instituudi direktor ja spordibioloog Kristjan Port mainis ETV saates "Vabariigi kodanikud", et töövõime taastamiseks kasutatakse sageli narkootilisi aineid ning seda teevad ka arstid. Kristjan Porti selgitused

  6. Opening Doors for Marina and Carina

    Science.gov (United States)

    Ritchey, Margaret

    2011-01-01

    This article describes the process of becoming a more reflective practitioner in the delivery of pediatric physical therapy through attention to 3 challenges: the therapist's resistance to addressing infant-parent mental health issues, the parents' resistance to acknowledging their infants' delays or disabilities, and the therapist's realization…

  7. Sulfide intrusion and detoxification in Zostera marina

    DEFF Research Database (Denmark)

    Hasler-Sheetal, Harald; Holmer, Marianne

    2014-01-01

    Sulfide intrusion in seagrasses represents a global threat to seagrasses. In contrast seegrasses grow in hostile sediments, where they are constantly exposed to sulfide intrusion. Little is known about the strategies to survive sulfide intrusion, if there are detoxification mechanisms and sulfur...... nutrition in general. By a global review of sulfide intrusion, coupled with a series of field studies and in situ experiments we elucidate sulfide intrusion and different strategies of seagrasses to sustain sulfide intrusion. Using stable isotope tracing, scanning electron microscopy with x-ray analysis...... to trace sulfur compounds and as well as metabolomics upon sulfide and anoxia exposure we identified different strategies to cope with sulfidic sediments. 1) Avoidance, by reoxidation of gaseous sulfide in the arenchyma to elemental sulfur and sulfate; where precipitation of sulfide occurred as non...

  8. Konets stoletija / Mati Unt ; per.: Marina Tervonen

    Index Scriptorium Estoniae

    Unt, Mati, 1944-2005

    1999-01-01

    Eesti keeles ilm.: Looming, 1998, nr. 5, pealk.: "Sajandilõpud". Essees refereeritakse Hillel Schwartzi teost "Zeitenwende - Weltende : Visionen beim Wechsel der Jahnhunderte von 990-1999. Braunschweig, 1992

  9. Sedamoodi 2005 : moda ot shkolnikov / Marina Poltavtseva

    Index Scriptorium Estoniae

    Poltavtseva, Marina

    2005-01-01

    Tallinna koolide õpilaste moekonkursist "Sedamoodi" räägib konkursi organisaator Tallinna Kanutiaia Noortemaja direktor Mari Velleste. Sedamoodi 2005 eri vanusegruppide võitjad. Rändauhinnaks on Tauno Kangro skulptuur

  10. Marina Martín Garcia

    NARCIS (Netherlands)

    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,

  11. Moda vernulas v Tallin / Marina Poltavtseva

    Index Scriptorium Estoniae

    Poltavtseva, Marina

    2005-01-01

    Tallinnas Viru Keskuses toimuvast moeürituste sarjast FIBIT. Keskne sündmus on Kuldnõela nominentide Katrin Kuldma, Tiina Talumehe, Thea Pilveti ja Evelin Lille kollektsioonide esitamine. Lisas "Primetshai marku!" juttu moekunstnik Oksana Tanditi uuest kollektsioonist, mida näidatakse ka Viru keskuses

  12. "Uzhe sentjabr. Temnejet rano..." : [luuletused] / Marina Tervonen

    Index Scriptorium Estoniae

    Tervonen, Marina, 1953-

    2003-01-01

    Sisu: "Uzhe sentjabr. Temnejet rano..." ; "Mne budjet rad breventshatõi ujut..." ; "Navstretshu mne zapahnet zemljanikoi..." ; "Slovo za slovom, volna za volnoi..." ; "Poslushai tishinu. Suhhaja jel..." ; "Okontshen dialog dozhdja i morja..." ; "Zdes vjut svoi gnezda strizhi i nadezhdõ..." ; "Bezmolvno den skontshalsja pod zakat..." ; "Zakontshilsja den. No tshto-to na serdtse ostalos..."

  13. Moda kak instrument integratsii / Marina Andrejeva

    Index Scriptorium Estoniae

    Andrejeva, Marina

    2008-01-01

    Moebutiigi Fashion Palace uute kollektsioonide demonstratsioon Tallinna restoranis Gloria. Näidati mudeleid itaalia kaubamärkide P.A.R.O.S.H. ja Ermano Severino ning prantsuse kaubamärgi YSL sügis-talvistest kollektsioonidest 2008/2009. Ehted olid inglise disainerilt Stephen Websterilt. Värvifotod

  14. Umberto Eco : olemise piire kombates / Marina Grishakova

    Index Scriptorium Estoniae

    Grišakova, Marina, 1961-

    2004-01-01

    Arvustus: Eco, Umberto. Eilse päeva saar / tõlkinud Merike Pau. Tallinn : Eesti Raamat, 2003 ; Eco, Umberto. Baudolino / itaalia keelest tõlkinud [ja järelsõna:] Ülar Ploom. Tallinn : Varrak, 2003

  15. Composición química y actividad antioxidante del alga marina roja Bryothamnion triquetrum (S.G.Gmelin Howe Chemical composition and antioxidant activity of the red marine algae Bryothamnion triquetrum (S.G.Gmelin Howe

    Directory of Open Access Journals (Sweden)

    Alexis Vidal

    2006-12-01

    Full Text Available En la actualidad existe un marcado interés por la búsqueda de antioxidantes de fuentes naturales, incluidas las algas marinas. El objetivo de este trabajo fue evaluar la composición química y propiedades antioxidantes del alga Bryothamnion triquetrum. Se estudió la composición centesimal y de minerales, identificación de ácidos grasos y sustancias antioxidantes. La composición centesimal es la siguiente: Proteínas (9,5%, Lípidos (1,3%, Carbohidratos (5,9%, Fibras (10,2% y Cenizas (43%. Los resultados de la actividad antioxidante para las diferentes metodologías empleadas fueron: atrapamiento de radicales DPPH• (38%, 4 mg de liofilizado, beta-Caroteno-Linoleico (12%, 4 mg de liofilizado, actividad atrapadora de radicales O2•- (CI50 0,36 mg/mL, de radicales OH• (CI50 2,11 mg/mL y unión al Fe (CI50 0,37 mg/mL. Las propiedades antioxidantes de esta alga parecen explicarse por la capacidad atrapadora de radicales libres, particularmente relacionada con mecanismos de dismutación de radicales O2•-, inactivación de radicales OH• y quelación de Fe. En trabajos previos se identificaron ácidos cinámicos y fenólicos como moléculas que pudieran explicar la actividad antioxidante, sin embargo adicionalmente se debe considerar un efecto sumatorio y/o sinérgico de otros componentes antioxidantes del extracto, como los descritos en este trabajo, incluidos minerales, carotenoides y vitamina C.An increasing interest has been growing during the past years for the search of natural origin antioxidants, particularly those from marine algae. In this context, the main objective of current research was to evaluate the chemical composition and some antioxidant properties of the aqueous extract of the seaweed Bryothamnion triquetrum. The extracts contains: Proteins (9.5%, Lipids (1.3%, Carbohydrates (5.9%, Fibers (10.2% and Ashes (43%. In current approach, the following results were obtained for the different procedures assessed: DPPH

  16. 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

  17. UVC-induced lysis and detritus production of Oscillatoria limnetica in a two-stage continuous-flow system

    NARCIS (Netherlands)

    Van Hannen, E.J.; Gons, H.J.

    1997-01-01

    In order to study in model systems the role of heterotrophic micro-organisms in the aquatic microbial food web, a natural food source consisting of senescent primary producer cells is indispensable. A two-stage continuous-flow system with the ability to produce detritus continuously is presented. In

  18. Ecophysiology of Antarctic macroalgae: effects of environmental light conditions on photosynthetic metabolism Ecofisiología de macroalgas marinas antárticas: efectos de las condiciones de luz sobre el metabolismo fotosintético

    Directory of Open Access Journals (Sweden)

    I. GÓMEZ

    2001-06-01

    from temperate and cold-temperate regions. This clearly indicates a major physiological adaptation to the polar environmentLas variación estacional en la duración del día en los ambientes polares es el principal factor ambiental que regula la actividad fotosintética de las algas marinas. El aparato fotosintético de especies de algas pardas tales como Ascoseira mirabilis o Desmarestia menziesii, pertenecientes al grupo denominado "season anticipators", posee la habilidad de usar la radiación solar incidente durante el período de aumento de horas diarias de luz en el invierno tardío y primavera. El desarrollo estacional y la distribución de biomasa en el talo afectan también la actividad fisiológica de estas algas. De este modo, la diferenciación de la capacidad para fotosintetizar (medida como evolución de oxígeno y fijación de carbono a través de la planta representa una adaptación morfo-funcional que optimiza la conversión de energía lumínica en producción primaria. En Desmarestia menziesii, las fases reproductivas tienen diferentes características fotosintéticas. Las micro-fases, gametofitos y estadíos tempranos de los esporofitos están mejor adaptados para usar niveles más bajos de luz que las plantas adultas (esporofitos, básicamente debido a un mayor contenido de pigmentos por unidad de biomasa, mayor eficiencia fotosintética y muy bajos requerimientos de luz para fotosíntesis. Esta estrategia asegura la consumación del ciclo de vida bajo condiciones variables de luminosidad. Las bajas demandas de luz para crecimiento y fotosíntesis no sólo posibilitan la supervivencia de macroalgas en escenarios lumínicos estacionalmente cambiantes, sino que paralelamente les permite expandir sus límites de distribución en profundidad. La inexistencia de diferencias en capacidad fotosintética máxima (Pmax y eficiencia fotosintética (a de poblaciones de una misma especie habitando diferentes profundidades (entre 10 y 30 m sugiere una baja

  19. Sintesis icnológica de unidades mesozoicas marinas de la Cuenca Neuquina, nuevos datos y perspectivas Ichnological synthesis of the marine unitsof the Neuquén Basin, new data and future perspectives

    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

  20. Protective effect of flavonoids from Zostera marina against chronic alcohol hepatic injury in mice%大叶藻黄酮对酒精性肝损伤的保护作用

    Institute of Scientific and Technical Information of China (English)

    李静; 张朝辉; 段筱杉; 应锐

    2016-01-01

    为了深入挖掘大叶藻黄酮(ZF)的生物活性,提高大叶藻的利用价值,本实验研究了ZF对酒精性肝损伤的保护作用;实验采用纤维素酶-超声波辅助复合浸提法提取大叶藻中的天然活性物质黄酮类化合物,并采用聚酰胺树脂柱层析法对其进行纯化;研究ZF的体外抗氧化能力;将60只ICR小鼠随机分成6组,通过建立酒精性肝损伤模型,研究ZF对肝损伤的保护作用;结果显示,经纯化后ZF的含量达到80%.体外实验表明ZF对DPPH自由基和羟基自由基有清除能力,具有一定的抗氧化活性;体内实验表明ZF对酒精性肝损伤小鼠的抗氧化能力、脂质代谢能力以及乙醇代谢能力均有影响.ZF各剂量组与模型组相比,血清ALT、AST和γ-GT活性显著降低,肝组织MDA含量显著降低,乙醇代谢酶活性显著提高;ZF中、高剂量组小鼠肝组织GSH-Px和SOD活性显著提高,血脂浓度显著降低.长期过量饮酒可导致小鼠肝脏严重损伤,ZF可以改善小鼠肝组织损伤情况,对酒精性肝损伤起到保护作用,其机制可能与增强机体抗氧化能力、调节脂质代谢和乙醇代谢能力有关.%The aim of this study was to investigate the protective effect and its mechanism in the context of antioxidant of flavonoids from Zostera marina (ZF) on chronic alcohol hepatic injury in mice.This study would provide scientific basis for the prevention of chronic alcohol hepatic injury.ZF were extracted by the combination of cellulose and ultrasonic wave assisted and purified by polyamide resin column chromatography.The scavenging DPPH and hydroxyl free radicals abilities of ZF were studied.To establish chronic alcohol hepatic injury model,60 ICR mice were randomly divided into 6 groups (10 mice per group):normal group (C),model group (M),positive group (P),FL group treated with ZF at dose of 40 mg/kg·d,FM group treated with ZF at dose of 80 mg/kg·d and FH group treated with ZF at dose of 160 mg

  1. 4种红树净光合速率对光和 CO2浓度的响应特征%Responses of Net Photosynthetic Rate on Light Intensity & CO2 Concentration in Leaves of Kandelia candel,Aegiceras corniculatum,Avicennia marina & Bruguiera gymnorrhiza

    Institute of Scientific and Technical Information of China (English)

    黄丽; 王德炉; 谭芳林; 黄石德; 黄雍容

    2013-01-01

    以秋茄、桐花树、白骨壤和木榄等4种红树为研究对象,测定了这4种红树在自然生境中的光合作用对光和CO2的响应曲线,阐述了其光合作用对光和CO2浓度的响应特征。结果表明,不同红树光补偿点(LCP)和光饱和点(LSP)不同,4种红树 LCP为白骨壤(81.95μmol · m -2· s-1)>桐花树(61.84μmol · m -2· s-1)>秋茄(47.09μmol·m -2·s-1)>木榄(39.79μmol·m -2·s-1),LSP为桐花树>秋茄>白骨壤>木榄;不同红树间表观量子效率存在差异,秋茄的表观量子效率最高为0.031,木榄最低为0.012,桐花树(0.027)高于白骨壤(0.017);4种红树植物光合作用的CO2补偿点介于103~152μmolCO2· mol-1,说明4种红树均为C3植物;CO2补偿点从大到小的顺序为木榄>白骨壤>桐花树>秋茄;4种红树羧化效率(CE),最大的为桐花树,其次为秋茄,再次为白骨壤,木榄最低。%Taking four mangrove species (Kandeliacandel ,Aegiceras corniculatum ,Avicennia marina ,& Brugui-era gymnorrhiza) as research objects ,the response curve of net photosynthetic rate in above-mentioned mangroves on light intensity & CO2 concentration in the natural habitat was measured .Response characteristics of their light intensity & CO2 concentration on photosynthesis were described .Result shows that :the light compensation point (LCP)& light saturation point (LSP) of the four mangrove species are different .The LCP of the four mangrove species was that Avicenniamarina(81 .95μmol· m -2 · s-1)> Aegicerascorniculatum(61 .84μmol· m -2 · s-1)>Kandeliacandel(47.09 μmol·m -2·s-1)> Bruguieragymnorrhiza(39.79 μmol·m -2·s-1);theLSPisthat :Aegicerascorniculatum > Kandeliacandel > Avicenniamarina > Bruguieragymnorrhiza;theapparentphoto-synthetic quantum yield (AQY) point of the four mangrove species have differences ;the AQY (CO2 · photon-1 ) from high to low is :Kandeliacandel

  2. Marina Kaljurand - Eesti hääl Moskvas / Marina Kaljurand ; interv. Margus Saar

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2007-01-01

    Eesti suursaadik Moskvas vastab küsimustele, mis on seotud saatkonna ees toimunud meeleavaldustega, saatkonnas valitsenud olukorraga, ajalehe Argumentõ ja Faktõ pressikonverentsil juhtunuga, suursaadiku puhkuselelubamisega, Eesti-Vene suhetega

  3. Anketa delovoi zhenshtshinõ / Marina Laikjõe ; interv. Marina Andrejeva

    Index Scriptorium Estoniae

    Laikjõe, Marina, 1967-

    2005-01-01

    Laulasmaa Resort juhatuse esimees võimalustest paremini organiseerida oma tööpäeva, oponendi mõjutamisest, meeste osast oma karjääris, karjäärile kaasaaidanud isiklikest omadustest, hingelise tasakaalu saavutamisest, riietumisstiilist, tööle ja perele pühendatud ajast, seni saavutatust. Lisa: CV

  4. Cultivos discontinuos alimentados con urea de la cianobacteria phormidium sp. en función de la salinidad y edad del cultivo

    OpenAIRE

    Lorena del valle Jonte Gómez; Néstor Rosales-Loaiza; José Luis Bermúdez-González; Ever Dario Morales Avendaño

    2013-01-01

    Título en ingles: Urea fed-batch cultures of the cyanobacterium  Phormidium sp. as a function of the salinity and age of cultures Título corto: Cultivos discontinuos alimentados de Phormidium sp.Resumen: Se  Se comparó la eficiencia de sistemas de cultivos discontinuos alimentados versus cultivos discontinuos convencionales, en cuanto a concentración de nitrógeno, adicionando 0,2 mM de urea cada tres días al final de la fase exponencial, durante 21 días. Se realizaron cultivos con un volumen ...

  5. 大叶藻海草床的生态恢复:根茎棉线绑石移植法及其效果%Transplantation of eelgrass (Zostera marina L.) in Huiquan Bay using rhizomes bound to a small elongate stone with bio-degradable cotton thread

    Institute of Scientific and Technical Information of China (English)

    刘鹏; 周毅; 刘炳舰; 刘旭佳; 张晓梅; 杨红生

    2013-01-01

    于2009年和2010年在青岛汇泉湾用根茎棉线绑石法进行大叶藻(Zostera marina L.)移植,并于2012年4月20日至11月19日对移植大叶藻的生长情况进行观察(包括形态学变化、密度、茎枝高度、地上生物量、底质粒径几个方面)。观察期间水温为7.8~26.1℃。结果显示,移植底质可定性为粉砂质;移植大叶藻的有性繁殖期为2012年4~8月;无性繁殖在秋季达到高峰;密度在6月和9月分别高达411茎枝/m2和481茎枝/m2;高度与地上生物量的最大值出现在6~7月份。与2009年青岛湾天然大叶藻进行比较后可以发现,移植大叶藻的高度、地上生物量及其季节变化与天然大叶藻基本保持一致,说明移植大叶藻的生长状况良好,同时说明根茎棉线绑石法是一种高效且实用的海草床生态恢复方法。%The eelgrass (Zostera marina L.) was transplanted with a new simple method in Huiquan Bay, Qingdao, i.e several rooted shoots tied on a small elongate stone with cotton thread were planted in 2009 and 2010. From April 20 to November 19, 2012, the morphology, shoot density, shoot height, aboveground biomass and particle-size of sediment of the transplanted eelgrass were observed. The water temperature ranged from 7.8 to 26.1℃ during the observation. The results showed that the sexual reproduction of eelgrass occurred from April to August, and that the asexual reproduction occurred frequently in autumn. The mean shoot density ranged from 240 to 481 shoots/m2, with relative higher values of 411 shoots/m2 and 481 shoots/m2 in June and September, respectively. The highest values of shoot height and aboveground biomass occurred in June to July. The sediment was characterized by silt. The values and variations of shoot height and aboveground biomass were similar with those of natural eelgrass in Qingdao Bay, observed in 2009. We conclude that the transplanted eelgrass grew well, suggesting that the new method was

  6. Studies on the Secondary Metabolites Produced by Mixed Cultures of Two Epiphytic Fungi Isolated from a Fruit of Mangrove Avicennia marina%榄钱两株附生真菌混合培养次级代谢产物研究

    Institute of Scientific and Technical Information of China (English)

    朱峰; 胡谷平; 陈忻; 袁毅桦; 黄美珍; 孙恢礼; 向文洲; 林永成

    2009-01-01

    A mixed culture of two epiphytic fungi from a rotten fruit of mangrove Avicennia marina produced two antibacterial secondary metabolites ( A and B). Their structures were elucidated as neo-aspergillic acid (A) and kojic acid (B) by comprehensive spectral methods (mainly by 2D NMR spectral methods). The structure of compound B was further characterized by single crystal X-Ray diffraction analysis. The crystal of compound B belongs to monoclinic system, space group is P2_1/n. The unit cell parameters are: a =0.378 33 (3) nm, b=1.837 58 (14) nm, c =0.848 89 (7) nm, α =90°, β = 96.7520 (10)°,γ=90°, V= 0.586 06 (8) nm~3 and Z=4.Compound A was not obtained when either strains was cultured individually. The results showed that the application of mixed culture technique would be contribute to discover more novel natural products from marine microorganisms.%通过混合培养2株附生于南海榄钱的真菌产生了2个抗菌次级代谢产物(A和B),其结构通过完整的波谱数据(主要是2D NMR数据)分别解析为新曲霉酸(A)和曲酸(B).化合物B的结构进一步通过单晶X-射线衍射分析得到证实.当单独培养这2株真菌时未能得到化合物A.研究结果进一步表明,混合培养技术有助于从海洋微生物中发现更多独特的天然产物.

  7. Sedimentitas marinas de la Formación Barranca Final (Mioceno medio-superior de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina Marine sediments of the Barranca Final Formation (Middle-Upper Miocence of the Colorado Basin in south-east La Pampa province, Argentina

    Directory of Open Access Journals (Sweden)

    G. Visconti

    2003-06-01

    Full Text Available En este trabajo se describen sedimentitas carbonáticas, silicoclásticas y evaporíticas del Mioceno de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina. Sobre la base de la litología, las estructuras sedimentarias y los fósiles se identificaron siete facies y dos asociaciones de facies, correspondientes a ambientes marino somero (intermareal a supramareal y fluvial, para las secciones analizadas. Las sedimentitas marinas infrayacen a las areniscas fluviales de la Formación Río Negro y se consideran correlacionables con las sedimentitas de la Formación Barranca Final (Mioceno medio-superior, depositadas en la cuenca del Colorado durante la transgresión "Entrerriense". El hallazgo de estos niveles confirma la presencia de este mar en el sureste de la provincia de La Pampa.This paper describes Miocene carbonatic, siliciclastic and evaporitic sedimentary rocks of the Colorado Basin, from southeast of La Pampa Province, Argentina. Seven facies and two facies assemblages of shallow marine (intertidal and supratidal settings and fluvial environments are inferred on the basis of lithology, sedimentary structures, and fossil content. The thin marine level underlies the fluvial sandstones of the Río Negro Formation, and is considered contemporary with the Barranca Final Formation (middle-upper Miocene, of the Colorado Basin, which is the depositional record of the "Entrerriense" transgression. The occurrence of these sedimentary rocks confirms the presence of the "Entrerriense" sea in the south-east of La Pampa Province during the Miocene.

  8. La delimitación de áreas marinas y submarinas entre barbados y Trinidad-Tobago y, entre Guyana y Surinam, sobre los derechos de jurisdicción de Venezuela en el Océano Atlántico

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    Yennybel Mirabal Montiel

    2015-01-01

    Full Text Available El propósito de la investigación, es analizar los efectos de las sentencias dictadas por el Tribunal Internacional del Derecho del Mar, que establecieron el límite marítimo entre Barbados y Trinidad-Tobago y, Guyana y Surinam, sobre los derechos de jurisdicción de Venezuela en el espacio marítimo que se proyecta hacia el Océano Atlántico. La misma, se desarrolló a través de la modalidad de investigación documental y un estudio analítico y de tipo conceptual, enmarcado en una revisión y selección bibliográfica de las principales fuentes documentales en Venezuela y el mundo sobre el Derecho del Mar, debido a que éste establece el marco fundamental para todos los aspectos de derecho, jurisdicción y usufructo de los Estados, en relación con los espacios marítimos. Con esta investigación, se pretende dar una visión aproximada de la realidad que se presenta en la fachada atlántica de Venezuela y, como ésta, se ve afectada por los intereses y las pretensiones de Estados vecinos, debido a que del resultado de las delimitaciones de áreas marinas y submarinas adyacentes al frente atlántico, dependerá la preservación de los derechos del Estado venezolano correspondientes al territorio del estado Delta Amacuro y al territorio de la Guayana Esequiba.

  9. Metalización de medidas de corrección de la intrusión marina en los acuíferos de río Vélez, río Verde y Castell de Ferro (provincias de Málaga y Granada

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    Pulido-Bosch, A.

    1996-12-01

    Full Text Available The sea water intrusion process shows different dynamics in three spanish southmediterranean coastal aquifers affected by seasonal overexploitation (Rio Vélez, Rio Verde and Castell de Ferro. On the base of these differences we carried out a mathematical modeling to check the effectiveness of severa1 hypothetical actions against this contaminant process. For the Rio Vélez aquifer we have modeled first of al1 a total omission of flow in the river during the wet season. We conclude the sea water intrusion should be not affected noticeably. Second of al1 we have simulated a certain flow in the river during the whole year, which should reduce markedly the volume of sea water intruding this aquifer. The modeling for the Rio Verde aquifer shows that an artificial recharge (using resources from neighbouring basins during the wet season is not an efficient action against sea water intrusion. During the dry season it should be more efficient against contamination to use the imported resources directly for irrigation than using then to recharge the system. Finally, an hypothetical stoppage of pumping in the Castell the Ferro aquifer should make sea water intrusion to disappear, but should not be efficient to wash remaining salts. So, we have simulated as well the effect of a low permeability barrier located between the detrital materials and a karstified block connected to the sea as well. This action appears as an interesting one as it should reduce the volume of sea water intrusion and inducing to an increase of seaward flow through the detrital materials, giving way to a good washing of salts.La intrusión marina presenta una dinámica diferente en tres acuíferos de la costa sur mediterránea española sometidos a sobreexplotación estacional (río Vélez, río Verde y Castell de Ferro. Sobre la base a estas diferencias llevamos a cabo una simulación matemática encaminada a determinar la eficacia de diversas medidas en cada caso contra este

  10. Diversity, dynamics and biogeography of Chilean benthic nearshore ecosystems: an overview and guidelines for conservation Diversidad, dinámica y biogeografía del ecosistema costero bentónico de Chile: revisión y bases para conservación marina

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    MIRIAM FERNANDEZ

    2000-12-01

    characteristics in terms of ecosystem processes (e.g., particular disturbance and upwelling regimes in coastal marine ecosystems and species (e.g., endemic and keystone species. For most marine invertebrates and macroalgae, hotspots in species diversity are present in southern Chile. New studies addressing the causal factors generating these large-scale patterns of species distribution are also needed; information about coastal oceanography and larval supply is still poor. This information crucial for the design of a marine reserve network. The information available on community structure and ecosystem functioning, especially highlighting the effect of human impact, comes from very few geographic regions. More information about community structure for other areas of the coast is required, particularly considering the strong differences in temperature, circulation patterns, habitat heterogeneity, species composition, as well as of upwelling and El Niño effects along the 4,000 km of coastline. Finally, we list what we think are the most harmful human activities by area and environment along the coast, and integrate this information to suggest possible environmental indicators, and basic needs and guidelines for marine conservation in ChileA pesar de que Chile ha sido un país pionero en estudios del efecto del impacto humano sobre la estructura comunitaria en ambientes marinos, y a pesar de la enorme importancia económica y social que el ambiente marino tiene para el país, el desarrollo de programas de conservación marina y de bases científicas para la sustentabilidad no se han generado a la misma tasa a la que han explotado los recursos y se ha utilizado el ambiente costero para diversos fines. Aunque nosotros pensamos que el establecimiento de planes de conservación a lo largo de la costa de Chile debe basarse en varios factores, los principios científicos, biológicos y ecológicos deben guiar muchos de estos esfuerzos, y en este trabajo nosotros intentamos presentar una

  11. Diatomeas marinas de aguas costeras de la provincia de Buenos Aires (Argentina.: III Géneros potencialmente nocivos Asterionellopsis, Cerataulina, Ceratoneis y Leptocylindrus Marine diatoms from Buenos Aires coastal waters (Argentina: Ill Potentially harmful genus Asterionellopsis,Cerataulina, Ceratoneis y Leptocylindrus

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    INÉS SUNESEN

    2007-12-01

    Full Text Available El presente trabajo está abocado al estudio morfológico, taxonómico y distribucional de las especies de diatomeas pertenecientes a los géneros Asterionellopsis, Cerataulina, Ceratoneis y Leptocylindrus halladas en aguas costeras marinas de la provincia de Buenos Aires, Argentina. Las muestras planctónicas fueron colectadas en San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar y Villa Gesell, entre noviembre de 1994 y septiembre de 2000. Material sin tratar y tratado fue analizado con microscopio óptico y microscopio electrónico de barrido. Seis taxa correspondientes a los géneros mencionados fueron determinados, de los cuales Cerataulina dentata es citada por primera vez para Argentina y Leptocylindrus minimus es citada por primera vez para el área costera de la provincia de Buenos Aires. Todas las especies reportadas como nocivas no toxígenas para otras áreas geográficas fueron encontradas. Cerataulina pelágica, Ceratoneis closterium y Leptocylindrus minimus, componentes ocasionales del plancton del área siempre en bajas densidades, no fueron nunca asociadas a episodios de floración. Asterionellopsis glacialis, componente habitual del plancton, fue causante de discoloraciones nocivas para el turismo y las actividades recreacionalesThe present work is devoted to the morphological, taxonomic, and distributional study of the diatom species belonging to the genera Asterionellopsis, Cerataulina, Ceratoneis and Leptocylindrus found in the marine coastal waters of Buenos Aires Province, Argentina. Planktonic samples were collected from November 1994 to September 2000 at San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar and Villa Gesell. Raw and cleaned samples were analysed with light and scanning electron microscopy. Six taxa of the mentioned genera were determined, of which Cerataulina dentata is reported for the first time for Argentina and

  12. 厦门东屿白骨壤林土壤甲烷的产生量、氧化量、传输率与库量%Methane production, oxidation, transportation rate and pool in sediments of an Avicennia marina mangrove at Dongyu, Xiamen

    Institute of Scientific and Technical Information of China (English)

    叶勇; 林鹏; 卢昌义

    2001-01-01

    Methane production, oxidation, transportation rate and pool were determined in sediments of an Avicennia marina mangrove at Dongyu, Xiamen. The flat pattern of methane production was inner-flat>mid-flat>out-flat and the values in winter and autumn were lower than that in summer and spring. The spatial and temporal patterns of methane oxidation and pool were similar to those of methane production. The values of methane production, oxidation and pool averaged from all flats and seasons were 9.11, 7.58 mg/(m2*d) and 27.07 mg/m2, respectively. The ratios of methane oxic oxidation to total oxidation in inner-flat, mid-flat and out-flat were 99.7%, 59.1% and 75.4%, respectively, higher than those of anoxic methane oxidation. Methane transportation rate was highest in summer and lowest in winter and the value averaged in all flats and seasons was 17.06%.%测定了厦门东屿白骨壤(Avicennia marina)林土壤的甲烷产生量及其在土壤中的氧化、传输与库量.土壤甲烷产生量基本上呈内滩>中滩>外滩的滩面变化趋势,季节变化趋势为秋、冬季低于春、夏季,与甲烷氧化量的时空变化模式一致,与甲烷库量的时空变化模式也基本相同.所有季节所有滩面土壤甲烷产生量、氧化量、库量的平均值分别为9.11mg/(m2*d)、7.58 mg/(m2*d)、27.07mg/m2.在外滩、中滩和内滩土壤甲烷氧化量中,好氧甲烷氧化量分别占99.7%、59.1%和75.4%,高于厌氧甲烷氧化量所占的比例.土壤甲烷传输率夏季最高而冬季最低,所有季节所有滩面的平均值为17.46%.

  13. Did the continent and sea have different temperatures in the northern Antarctic Peninsula during the Middle Eocene? Eran diferentes las temperaturas continentales y marinas durante el Eoceno Medio en el norte de la Península Antártica?

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    A.L. Cione

    2007-12-01

    Full Text Available The Seymour Island beds include a remarkable representation of the continental flora and fauna and marine fauna of Eocene in southern high latitudes. We suggest that, at least during the deposition of the best sampled unit, the Cucullaea I Allomember of the La Meseta Alloformation in the Seymour Island area, a cold temperate terrestrial environment co-existed with relatively warmer temperatures in the adjacent shallow shelf sea. This is suggested by the fish and invertebrate fauna and could have been due to the presence of warmer waters of a current reaching the region from the north. The temperature drop proposed for the time of deposition of the uppermost part of the La Meseta Formation (Submeseta Allomember appears to correspond to the global drop of the end of the Eocene and beginning of Oligocene and not to the establishment of the Antarctic Circumpolar Current.Los estratos de la Isla Seymour incluyen una notable representación de flora y fauna continentales y fauna marina del Eoceno de altas latitudes australes. En este trabajo sugerimos que, un ambiente terrestre templado frío coexistió al menos durante la depositación de la unidad mejor muestreada, el Alomiembro Cucullaea I de la Aloformación La Meseta en el área de la Isla Seymour, con un ambiente marino costero y somero con temperaturas más cálidas. Esto es sugerido por la fauna de peces e invertebrados y pudo deberse a la presencia de una corriente de aguas cálidas que alcanzó el norte de la península. La caída de temperatura propuesta para el momento de depositación de la parte más superior de la Formación La Meseta (Alomiembro Submeseta parece corresponder con la caída global a fines del Eoceno y comienzos del Oligoceno y no al establecimiento de la corriente circumpolar antártica.

  14. Germination and seed bank analysis of Zostera marina

    OpenAIRE

    Elma, Eylem

    2011-01-01

    In the last decades the loss of the only true marine flowering plants- the seagrasses have dramatically increased worldwide. Important ecosystem functions like stabilizing seabeds, providing food and habitat for marine organisms and carbon sequestration make seagrasses a foundation species in the littoral zone. The loss of seagrasses has lead to strong scientific interest and efforts to restore seagrass meadows increase. For successful restoration projects, large numbers of propagules from...

  15. Marina Kaljurand tõmbab Moskvas otsad kokku / Igor Taro

    Index Scriptorium Estoniae

    Taro, Igor

    2008-01-01

    Ilmunud ka: Postimees : na russkom jazõke 16. juuni 2008, lk. 11. Eesti suursaadik Venemaal lõpetab töö Moskvas ja asub tööle välisministeeriumi asekantslerina välismajanduse ja arengukoostöö küsimuses

  16. Marina's Fish Shop: A Mathematically- and Technologically-Rich Lesson

    Science.gov (United States)

    Wander, Roger; Pierce, Robyn

    2009-01-01

    In early 2008 researchers from the University of Melbourne's "New Technologies for Teaching Mathematics" project created a lesson for the Year 10 students at their Victorian research schools. Two important goals of secondary school mathematics education are to build students' conceptual knowledge and to teach students to think mathematically.…

  17. Sunflower Beauty Contest : tsvetõ zimoi / Marina Poltavtseva

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    Poltavtseva, Marina

    2001-01-01

    Lillekleitide võistlusest Sunflower Beauty Contest Tallinna klubis Decolte. Konkursi idee on florist Tatjana Tridvornovalt. Esimese koha sai Viimsi lilleäri lilleseadjate Meri-Liis Kõivu ja Triinu Põlderi lillekleit "Talvepruut"

  18. Inside i outside : "Svoja drama" / Marina Dmitrijevskaja, Boris Tuch

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    Dmitrijevskaja, Marina

    2006-01-01

    4.-9. septembrini Tartus toimunud "Oma Draama" festivali lavastustest - Merle Karusoo "Misjonärid", Mart Kivastiku "Põrgu wärk" (lavastaja Hendrik Toompere jun) ja "Kits viiuli ja õngega" (lavastaja Aleksander Eelmaa) ning Andrus Kivirähki "Sürrealistid" (lavastaja Hendrik Toompere jun.)

  19. Nuevas adiciones de bivalvos a la malacofauna marina peruana

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    Carlos Paredes

    2014-06-01

    Full Text Available Cuatro especies de moluscos bivalvos marinos, Nuculana (Jupiteria cuneata (Sowerby, 1833, Isognomon (Isognomón janus Carpenter, 1857, Ostrea conchaphila Carpenter, 1857 y Mysella (Rochefortia molinae Ramorino, 1968 se reportan por primera vez para el mar peruano. Se incluye datos sobre la distribución geográfica y el hábitat de cada una de las especies.

  20. Enterococcus growth on eelgrass (Zostera marina); implications for water quality.

    Science.gov (United States)

    Ferguson, Donna M; Weisberg, Stephen B; Hagedorn, Charles; De Leon, Kristine; Mofidi, Vida; Wolfe, Julia; Zimmerman, May; Jay, Jennifer A

    2016-04-01

    Enterococci are fecal indicator bacteria used to monitor fecal pollution of recreational waters. When enterococci levels exceed health standards, fecal pollution is assumed as the cause. Enterococci growing on plants limit their usefulness as fecal indicator bacteria. Here we examined enterococcal growth on eelgrass in Mission Bay, CA where enterococci levels have exceeded water quality thresholds. A total of 69 eelgrass samples were collected from six sites, shaken to remove enterococci attached to plant surfaces and the eluant filtered onto culture media. Isolates were then identified to species using biochemical methods, and DNA typing by pulsed-field gel electrophoresis was done to assess clonality of strains. Enterococci concentrations among eelgrass ranged from 8 to 14 000 CFU g(-1) dry weight. The most predominant enterococcal species found were Enterococcus casseliflavus and E. hirae followed by E. faecalis. Cluster analysis indicated a high level of clonality among isolates across all species, with clonal isolates consistently associated with individual eelgrass samples. Finding high densities of E. casseliflavus, E. hirae and E. faecalis on eelgrass that included clonal strains indicates the capability of enterococcal growth on eelgrass. Amplification of enterococci on eelgrass presents challenges for regulatory agencies that interpret elevated levels of these bacteria as an indication of fecal pollution. PMID:26976844

  1. Võsokaja moda : v muzei ili na prodazhu? / Marina Radina

    Index Scriptorium Estoniae

    Radina, Marina

    2006-01-01

    Kõrgmoenädalast kevad/suvi 2006 Pariisis. Tuntud disainerite ja moemajade Jean Paul Gaultier', John Galliano (Christian Diori moemaja), Chaneli, Valentino, Christian Lacroix', Elie Saab'i kollektsioonidest. Chaneli moemaja demonstratsioonil osales ka Carmen Kass

  2. Ehho - drugogo mira / Natalja Svetlova ; interv. Marina Suranova

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    Svetlova, Natalja

    2006-01-01

    Kirjanik Aleksandr Solzhenitsõni abikaasa kirjanikust ja Gleb Panfilovi uuest teleseriaalist Aleksandr Solzhenitsõni "Esimeses ringis" järgi, kus kirjanik on stsenaariumi autor ja loeb ka kaadritagust jutustavat teksti. Peaosas Jevgeni Mironov

  3. FIBIT - Fashion is back in Tallinn / Marina Poltavtseva

    Index Scriptorium Estoniae

    Poltavtseva, Marina

    2004-01-01

    Moepäevad FIBIT Viru keskuses. Üks idee algatajaid on moekunstnik Katrin Kuldma. 1. oktoobril näidatakse soome moekunstniku Ritva-Liisa Pohjalaineni kollektsiooni Allergia - From Dreams to the Unique. Teisi moedemonstratsioone, millede stilistideks on Riina Põldroos, Aldo Järvsoo, Tanel Veenre ja Katrin Kuldma. Rõivad on valitud Viru keskuse kauplustest

  4. Moskovskije oligarhi predpotshitajut / Tatjana Tridvornova ; interv. Marina Poltavtseva

    Index Scriptorium Estoniae

    Tridvornova, Tatjana

    2005-01-01

    Lilleballi ja Lillekleidi konkursi autori Tatjana Tridvornovaga tema tööst Moskvas. Avas Moskvas kunstistuudio Flowers Vasari. Tema abilisteks on eesti lilleseadjad Heiti Põder, Ahti Lyra ja Eve Aben

  5. El uso de biomarcadores en contaminación marina

    OpenAIRE

    Blasco, Julián

    1999-01-01

    7 páginas, 5 figuras. Los capítulos del libro corresponden a las conferencias presentadas por los autore de las mismas en el "III Curso de Patología, Fisiología y Biotoxicología en Acuicultura" dirigido por las Dras. Carmen Sarasquete, CSIC y M. Luisa González de Canales, UCA y celebrado en Puerto Real (Cádiz) en febrero de 1998.

  6. Neftetranzit i gossudarstvo = Oil transit and the state / Marina Vijar

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    Vijar, Marina

    2003-01-01

    Majandus- ja kommunikatsiooniministeeriumi asekantsler Andres Tint iseloomustab Eesti transiitkaubanduse sektorit, kaubagruppe ja veomahtusid ning investeeringuid raudtee ja sadamate infrastruktuuride arendamiseks vastavalt riigi transiidipoliitikale

  7. Las terrazas marinas del cuaternario reciente en los litorales de Murcia y Almería (España: el control de la neotectónica en la disposición y número de las mismas

    Directory of Open Access Journals (Sweden)

    Goy, J. L.

    1986-12-01

    Full Text Available We have included the Tyrrhenian seabeaches, i.e. those bearing Strombus bubonius as well as the Holocene beaches in Recent Quaternary period. The first ones, began to develop some 180.000 years ago and the second ones, around 8.000 years ago. From the cartographic and sedimentological studies of the pre-mentioned beaches it can be deduced that: the geometric and spatial distribution, number and height, are clearly conditioned by the tectonic activity of this Eastern Betics area.
    The highest amount of Tyrrhenian levels can be observed in the Almeria region, four of which are distributed between the height of 18 m. and 1 m. These heights decrease gradually northward up to the southern area of Terreros, where three Tyrrhenian terraces can be observed for the last time. From this point, and uo to the boundary of the Murcia and Alicante provinces, only one isolated level can be observed, and at heights very close to the present sea level. The same phenomenon occurs for the Holocene beaches.
    All of this, suggests that, at least, during the last Quaternary and up to now, the Almeria region has behaved as a more or less constant lifting area, while the littoral of Murcia has behaves as a sinking one, It seems that the tectonic pushes have been transmitted from South to North and that the more frequent and varied deformations have been produced in Almeria.

    Incluimos dentro del Cuaternario reciente .las playas marinas tirrenienses, es decir, con Strombus Bubonius, y las holocenas. Las primeras empiezan a desarrollarse hacia los 180.000 años y las segundas hacia los 8.000 años. Del estudio cartográfico y sedimentológico de las mismas se deduce que: la disposición geométrica/espacial, número y altura están claramente condicionados por la actividad tectónica de este área de las Béticas orientales.
    En la región de Almena se observa el mayor número de niveles tirrenienses, cuatro, repartidos entre las Cotas

  8. Fenotipo atípico de Vibrio ordalii, bacteria altamente patogénica aislada desde salmón del Atlántico cultivado en las costas marinas del sur de Chile Atypical phenotype of Vibrio ordalii, a highly pathogenic bacteria isolated from Atlantic salmon reared on the marine coast of southern Chile

    Directory of Open Access Journals (Sweden)

    H Bohle

    2007-01-01

    Full Text Available Durante invierno y primavera de 2003, salmones del Atlántico cultivados en las costas marinas del sur de Chile fueron afectados por brotes de una enfermedad. El análisis patológico reveló la presencia de lesiones en piel, úlceras hemorrágicas, mientras que los signos internos incluyeron pericarditis, peritonitis y focos necróticos múltiples en el hígado. En todos los casos, los cultivos bacterianos puros fueron aislados de las lesiones externas y órganos internos. La bacteriología convencional mostró como sospechoso a Vibrio sp como causante de la enfermedad. La identificación final de la bacteria fue llevada a cabo por análisis filogenético por la comparación de la secuencia casi total del gen que codifica el RNAr 16s. Este análisis reveló que las bacterias sospechosas pertenecen al grupo de los V. ordalii. Fenotípicamente, estas bacterias mostraron diferencias morfológicas, fisiológicas, bioquímicas, enzimáticas y antigénicas a los V. ordalii de referencia. Por esta razón, las cepas de campo podrían ser consideradas como un biotipo o fenotipo atípico de V. ordalii, aunque para ello es necesario más estudios comparativos entre los genomas completos de estas bacterias.During the winter and spring of 2003, Atlantic salmon (Salmo salar reared a sea farms along the marine coast of southern Chile, were affected by outbreaks of disease. The pathological analysis of the affected fish were characterized by the presence of skin lesions, haemorrhaging ulcers and mortality, while the internal signs included pericarditis, peritonitis, multiple necrotic foci in the liver and signs of systemic septicaemia. In all cases, pure cultures of bacteria were isolated from the lesions and internal organs. The isolated bacteria were characterized by means of conventional bacteriological identification assays, and a Vibrio sp. was suspected to be the agent of the disease. The final identification of the bacterial isolates was made after

  9. Tapetes microbianos del Salar de Llamará, norte de Chile Microbial mats from the Llamará salt flat, northern Chile

    Directory of Open Access Journals (Sweden)

    CECILIA DEMERGASSO

    2003-09-01

    Full Text Available Se estudiaron las comunidades estratificadas de microorganismos fotosintéticos que se encuentran en el Salar de Llamará ubicado en el desierto de Atacama, norte de Chile, mediante métodos microscópicos y espectrofotométricos. El espesor de la zona fótica de los tapetes descritos varió entre 8 y 30 mm lo cual podría atribuirse a la granulometría y la composición mineralógica de los sedimentos. Se diferencian tres tipos de tapetes. El primero con una única capa pigmentada de color verde; el segundo con capas de colores verde y naranja y un tercero en el que se observa, además de las capas verde y naranja, una de color púrpura. En uno de los sitios muestreados no se encontraron capas pigmentadas. Debajo de la zona pigmentada el sedimento es de color blanco, excepto en uno de los sectores donde se observó una coloración negra atribuible a sulfuro de hierro. Los microorganismos predominantes de la capa naranja fueron diatomeas y cianobacterias unicelulares principalmente de los grupos Cyanothece y Synechococcus. Las cianobacterias filamentosas Microccoleus sp. y Oscillatoria sp. fueron las más abundantes en la capa verde. No se observaron diatomeas en los sitios estudiados donde la salinidad del agua intersticial osciló entre 12 y 33 %. En la capa verde de estos sitios predominaron las cianobacterias cocoides, de los grupos Synechococcus, Cyanothece y Gloeocapsa y del género Gloeobacter, sobre las cianobacterias filamentosas. La capa púrpura estuvo compuesta principalmente por bacterias fototróficas anoxigénicas similares a células de los géneros Chromatium y Thiocapsa. Los espectros de absorción revelaron que la clorofila a es el pigmento más abundante en la mayoría de las muestras analizadas. Los valores integrados de clorofila a y bacterioclorofila a alcanzaron 230 y 144 mg m-2 en el espesor de la zona pigmentada, respectivamente. También se detectaron abundantes microorganismos no fotosintéticos en los tapetes

  10. Marina Kaljurand : ka meie vastutame Lähis-Ida kriisi eest / Marina Kaljurand ; interv. Sten A. Hankewitz

    Index Scriptorium Estoniae

    Kaljurand, Marina, 1962-

    2005-01-01

    Eesti suursaadik Iisraelis Iisraeli ja palestiinlaste konflikti põhjustest, selle mõjust välismaailmale ja prognoosid tulevikuks. Vt. samas: Eesti ja Iisraeli senised suhted; Eesti mineviku probleemi on Iisraelis siiski võimalik seletada

  11. Protein (Cyanobacteria): 205740 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available r protein) Oscillatoria sp. PCC 6506 MNNELLHSQFNATAVEFDPFASGEILVTAPATEAQKEIWLSVQMGDEANCAFNESQSLRLRGPLNLEILRS...SFQAIVQRHEALRTTLSADGSTLCITESLNLEIPLIDLSALSEQERKIQLAQLRRQAVEQPFNLEHGPLLRVQIIKLQAEEHLAIITAHHIICDGWSWGVFIPDLGAI

  12. Protein (Cyanobacteria): 385234 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available nown function (DUF2499) Oscillatoria acuminata PCC 6304 MHALSIPTWMIHVSSVIEWIAAIWLIWRYGEVTGDRYWRGLSFAMLPALVGAMCACTWHYFDNPTSLDWLVTLQATMTVVGNCTLCLAAWWIWRSAKRKPESEDSPLMNEGQQTAIGPQK ...

  13. Protein (Cyanobacteria): 319034 [PGDBj - Ortholog DB

    Lifescience Database Archive (English)

    Full Text Available wn function (DUF3110) Oscillatoria acuminata PCC 6304 MRVFVLLFNPRTENEGIHTLRIGDRNTILMFESEDDATRYALLLEAQDFASPTPEPLDSEEIEEFCRDAGYDSKLIHEGELAIPPETNLEELEWQPEAPEPEDDNLAQSELDRIRRQLEGLL ...

  14. Genetic Diversity and Differentiation of Eelgrass Zostera marina along Yantai and Weihai Coasts by Simple Sequence Repeat (SSR), in Reference to Conservation and Remediation of Seagrass Bed%烟威沿海大叶藻居群遗传多样性研究及对海草场修复的启示

    Institute of Scientific and Technical Information of China (English)

    田萍萍; 李晓捷; 张立楠; 江鑫; 潘金华; 于深辉; 彭捷

    2014-01-01

    Seventeen pairs of Simple Sequence Repeat (SSR) primers selected from 26 primers in a total of 57 individuals of eelgrass Zostera marina were applied to study genetic diversity and genetic differentiation in 3 populations of the eelgrass along Yantai and Weihai coasts (Chudao Peninsula ,RZM ;Danzi Island , DZM ;Gulf of Yudai Hill ,YZM) .The 17 loci were all found to be polymorphism ,and the alleles (Na) had 120 in number ,with an average of 7 alleles per locus .There were average effective number of alleles (Ne) of 2 .30 ,expected heterozygosity (He) of 0 .4743 ,observed heterozygosity (Ho) of 0 .4128 and Nei’ s gene diversity (H) of 0 .4700 ,the maximal genetic diversity in RZM population ,followed by YZM and the minimum in DZM population .The value of Fst (the average of genetic differentiation) was ranged from 0 .0534 to 0 .1226 and Nm (gene flow ) from 1 .7895 to 4 .4344 among the 3 populations ,indicating that the genetic differentiation may be attributed to meadow fragmentation in history .The AMOVA (analysis of molecular variance) showed that there was 89 .51% of genetic variation within populations ,and 10 .49%among populations . The result of UPGMA (unweighted pair-group method with arithmetic means ) dendrogram of the 3 seagrass populations was found to be consistent with results of the genetic distance among them .Overall ,the relatively lower genetic diversity in YZM population implied that the population needed sufficient conservation and remediation to increase the adaptive capacity to environmental changes and evolutionary potentials .The relatively lowest genetic diversity in DZM population was found to be attributed to the unsuitability of local substrate .Otherwise ,RZM population showed relatively higher genetic diversity and differentiation ,w hich is supposed to provide materials for transplantation of seagrass and supplement of seeds to other population in Yantai and Weihai coasts .%采用微卫星引物对烟威沿海3个大叶藻居群进

  15. Effects of solar UV radiation on photosynthesis and enzyme activities (carbonic anhydrase and nitrate reductase in marine macroalgae from southern Spain Efectos de la radiación solar UV sobre la fotosíntesis y actividades enzimáticas (anhidrasa carbónica y nitrato reductasa en macralgas marinas del sur de España

    Directory of Open Access Journals (Sweden)

    FÉLIX L. FIGUEROA

    2001-06-01

    nitrogen metabolism under solar radiation. Considering the absence of a significant correlation in U. rigida and the delay observed in maximal activities of P. cartilagineum in the absence of UV, it is suggested that UV radiation acts as an environmental signal involved in the control of cycles. The presence of feedback processes that control nitrogen assimilation as a function of carbon content is proposedEn este trabajo se presenta el efecto de la radiación solar ultravioleta (UV durante el ciclo diario de luz sobre la actividad fotosintética y la de dos enzimas claves en la incorporación de carbono, la anhidrasa carbónica, y en la reducción de nitrógeno inorgánico, la nitrato reductasa, en macroalgas del sur de España. Durante el ciclo diario de luz, la fotoinhibición, expresada como porcentaje de disminución del rendimiento cuántico efectivo desde la mañana al mediodía, estuvo linear y negativamente correlacionada con la irradiancia integrada diaria. Sin embargo, la recuperación, expresada como porcentaje de incremento del rendimiento cuántico efectivo desde el mediodía hasta el atardecer siguió un patrón diferente. Se observó recuperación completa a irradiancias integradas diarias menores a 1.0 x 10(4 kJ m-2. Sin embargo, a irradiancias diarias mayores, la recuperación fue sólo del 50 %. La existencia de fotoinhibición y de una recuperación diaria completa en macroalgas hace pensar que la fotoinhibición está funcionado como un mecanismo de fotoprotección contra radiaciones solares altas como ocurre en plantas terrestres. Además, los patrones de fotoinhición y recuperación tienen relación con la dosis acumulada diaria. Las actividades enzimáticas (anhidrasa carbónica y nitrato reductasa fueron determinadas en tres macroalgas marinas (Plocamium cartilagineum, Ulva rigida y Fucus spiralis bajo radiación solar completa (PAR + UV-A + UV-B y excluyendo la radiación UV (PAR. Bajo PAR + UV-A + UV-B se observó un máximo en la actividad de

  16. Optimización del cultivo a la intemperie y producción de exopolisacárido por el alga verde-azulada, (cianobacteria) Anabaena sp. ATCC 33047

    OpenAIRE

    Moreno Fernández, José

    1995-01-01

    Las microalgas constituyen un conjunto heterogéneo de microorganismos que poseen clorofila a y otros pigmentos, con características metabólicas propias de plantas superiores, entre las que destacan la capacidad de convertir eficientemente energía solar en en ... ergía química, vía fotosíntesis oxigénica (con agua como donador de electrones), y la simplicidad de sus requerimientos nutritivos, pudiendo sintetizar una variedad de biomoléculas a partir de sustratos inorgánicos disponibles en abun...

  17. Transducción de señales de estrés por el regulador de respuesta NblR en la cianobacteria Synechococcus sp. PCC7942

    OpenAIRE

    Ruiz Martinich, Diego; Salinas Berná, Paloma; Moronta Barrios, Félix; Cantos Coll, Raquel; Contreras de Vera, Asunción

    2009-01-01

    Mediante el proceso de clorosis o bleaching Synechococcus sp. PCC 7942 degrada los complejos antena del aparato fotosintético en respuesta a carencia prolongada de nitrógeno y otros factores de estrés. La activación del gen nblA, sometido a una compleja regulación, es esencial en este proceso, aunque la adaptación a estrés requiere la regulación de múltiples funciones, la mayoría desconocidas. El regulador de respuesta NblR activa fuertemente a nblA en condiciones de estrés. Además, la histid...

  18. Estructura genética del sistema de asimilación de nitrato y regulación global de la asimilación de nitrógeno en la cianobacteria synechococcus sp.

    OpenAIRE

    Luque Romero, Ignacio

    1994-01-01

    Los objetivos de este trabajo han sido profundizar en el estudio de la estructura genética de los genes implicados en la asimilación de nitrato en Synechococcus sp. PCC 7942, y contribuir al esclarecimiento del mecanismo de regulación de dichos genes mediante la proteína NtcA.

  19. Evaluación de los exopolisacáridos producidos por una cepa nativa de cianobacteria Nostoc sp. Como sustrato en la producción de bioetanol

    OpenAIRE

    Herrera Pérez, Ruth Marisol

    2012-01-01

    La inminente necesidad de buscar fuentes energéticas alternativas a los combustibles fósiles ha impulsado el desarrollo de nuevas tecnologías de producción energética, entre ellas el bioetanol. Éste biocombustible es producido principalmente utilizando como materia prima grandes cultivos de maíz y caña de azúcar, lo que ha generado controversia frente al uso de recursos apropiados para la producción de alimentos. En éste trabajo se estudió la microalga Nostoc sp. LAUN015 como fuente alternati...

  20. Diversity of Marine Cyanobacteria from Three Mangrove Environment in Tamil Nadu Coast, South East Coast of India

    Directory of Open Access Journals (Sweden)

    G. Silambarasan

    2012-04-01

    Full Text Available Marine cyanobacteria were isolated from rhizosphere soil samples, of the three mangroves viz Parangipettai, Ariyankuppam and Mudasal odai mangroves south east coast of India. As many as 39 Cyanobacteria, belonging to 12 families were identified in which Oscillatoriaceae alone contributed (11. The species such as Oscillatoria cortiana, Oscillatoria salina, Oscillatoria tenuis, Oscillatoria formosa, Lyngbya major, Lyngbya confervoides, Lyngbya majuscule, Lyngbya mesotricha, Phormidium stagnina, Plectonema terebrans and Plectonema putuale and minimum in Synechococcaceae recorded only one species the species such as Synechococcus elongatus. Among the species Synechocystis salina, Oscillatoria salina, Phormidium ambiguum, Phormidium tenue, Spirulina major distributed all the mangroves.