Pub Date : 2017-12-01DOI: 10.4067/S0718-19572017000300007
Elizabeth Romero-Hernández, Pedro C. Reyna-González, Guadalupe Pantoja-Yepez
EnglishThroughout snorkeling and scuba diving ten study zones (sampling banks established in previous research by Instituto Nacional de Pesca - INAPESCA) were evaluated where the presence of the sea cucumber was reported. By line transect sea cucumbers were censed and collected to be measured and weighed, as well as their habitat characteristics were recorded. A total of 138 stations in the Sistema Arrecifal Veracruzano (SAV), equivalent to 37.794 m² of reef area sampled in the north and south were analyzed. In just 25 sampling points there were found Holothuria floridana (associated to seagrass and sand habitat, 0-1.5 m deep, with total length average of 10.88 cm and fresh weight average of 64.09 g) and Isostichopus badionotus (associated to sand and live coral habitat, 1.5-15 m deep, total length average of 27.2 cm and fresh weight of 769.19 g). The average density of the total banks evaluated was 0.008 ind.m-2. Results indicate that sea cucumber population in SAV is fragmented (patchiness or aggregation sites) and is not susceptible of exploitation (low density of individuals per unit area). As a management measure, some banks were suggested as potential sites in which there was a major presence of sea cucumber, with the purpose of monitoring these areas and evaluate the density of the population. This research and its results offer a current status about the fishing potential of the sea cucumber so that in the future, it will allow the suggestion to investigate their culture for the natural repopulation for a sustainable use of this marine resource in the region. EnglishSe evaluaron 10 zonas de estudio (bancos de muestreo establecidos en investigaciones previas por el Instituto Nacional de Pesca - INAPESCA) mediante buceo libre y autonomo, donde se registro la presencia de pepino de mar. Usando el metodo de transecto en banda, se censaron y recolectaron los pepinos para luego medirlos y pesarlos. Se registraron ademas las caracteristicas del habitat. Se analizaron un total de 138 estaciones equivalentes a 37.794 m² de area muestreada en arrecifes de la zona norte y sur del Sistema Arrecifal Veracruzano (SAV). En solo 25 estaciones se encontro pepino de mar de las especies Holothuria floridana (asociada al habitat de pastos marinos y arena, a profundidades de 0-1,5 m, longitud total promedio de 10,88 cm y peso fresco promedio de 64,09 g) e Isostichopus badionotus (asociada al habitat de arena y corales vivos, profundidades de 1,5 a 15 m, longitud total promedio de 27,2 cm y peso fresco promedio de 769,19 g). La densidad promedio en el total de los bancos fue de 0,008 ind.m-2. Los resultados indican que la poblacion de pepino de mar en el SAV se encuentra fragmentada (distribucion en parches o sitios de agregacion) y no es susceptible a explotacion (baja densidad por unidad de area). Como una medida de manejo, se proponen algunos bancos como sitios potenciales en los cuales hubo mayor presencia de pepino de mar, con la finalidad de monitorear e
{"title":"Situación actual del recurso pepino de mar en el Sistema Arrecifal Veracruzano, México","authors":"Elizabeth Romero-Hernández, Pedro C. Reyna-González, Guadalupe Pantoja-Yepez","doi":"10.4067/S0718-19572017000300007","DOIUrl":"https://doi.org/10.4067/S0718-19572017000300007","url":null,"abstract":"EnglishThroughout snorkeling and scuba diving ten study zones (sampling banks established in previous research by Instituto Nacional de Pesca - INAPESCA) were evaluated where the presence of the sea cucumber was reported. By line transect sea cucumbers were censed and collected to be measured and weighed, as well as their habitat characteristics were recorded. A total of 138 stations in the Sistema Arrecifal Veracruzano (SAV), equivalent to 37.794 m² of reef area sampled in the north and south were analyzed. In just 25 sampling points there were found Holothuria floridana (associated to seagrass and sand habitat, 0-1.5 m deep, with total length average of 10.88 cm and fresh weight average of 64.09 g) and Isostichopus badionotus (associated to sand and live coral habitat, 1.5-15 m deep, total length average of 27.2 cm and fresh weight of 769.19 g). The average density of the total banks evaluated was 0.008 ind.m-2. Results indicate that sea cucumber population in SAV is fragmented (patchiness or aggregation sites) and is not susceptible of exploitation (low density of individuals per unit area). As a management measure, some banks were suggested as potential sites in which there was a major presence of sea cucumber, with the purpose of monitoring these areas and evaluate the density of the population. This research and its results offer a current status about the fishing potential of the sea cucumber so that in the future, it will allow the suggestion to investigate their culture for the natural repopulation for a sustainable use of this marine resource in the region. EnglishSe evaluaron 10 zonas de estudio (bancos de muestreo establecidos en investigaciones previas por el Instituto Nacional de Pesca - INAPESCA) mediante buceo libre y autonomo, donde se registro la presencia de pepino de mar. Usando el metodo de transecto en banda, se censaron y recolectaron los pepinos para luego medirlos y pesarlos. Se registraron ademas las caracteristicas del habitat. Se analizaron un total de 138 estaciones equivalentes a 37.794 m² de area muestreada en arrecifes de la zona norte y sur del Sistema Arrecifal Veracruzano (SAV). En solo 25 estaciones se encontro pepino de mar de las especies Holothuria floridana (asociada al habitat de pastos marinos y arena, a profundidades de 0-1,5 m, longitud total promedio de 10,88 cm y peso fresco promedio de 64,09 g) e Isostichopus badionotus (asociada al habitat de arena y corales vivos, profundidades de 1,5 a 15 m, longitud total promedio de 27,2 cm y peso fresco promedio de 769,19 g). La densidad promedio en el total de los bancos fue de 0,008 ind.m-2. Los resultados indican que la poblacion de pepino de mar en el SAV se encuentra fragmentada (distribucion en parches o sitios de agregacion) y no es susceptible a explotacion (baja densidad por unidad de area). Como una medida de manejo, se proponen algunos bancos como sitios potenciales en los cuales hubo mayor presencia de pepino de mar, con la finalidad de monitorear e","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000300007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49326233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-01DOI: 10.4067/S0718-19572017000300006
Tadashi Kono-Martínez, Christian D. Ortega‐Ortiz, A. Olivos-Ortiz, E. Torres-Orozco, E. González-Rodríguez
espanolSe investigaron las condiciones oceanograficas que podrian influir en la riqueza y distribucion de mamiferos marinos en costas del Pacifico Central Mexicano durante el 2011. Las observaciones de mamiferos marinos se realizaron desde dos plataformas de investigacion. Se muestrearon mensualmente 6 estaciones, donde se realizaron lances de CTD hasta 100 m y se tomaron muestras de agua para determinacion de nutrientes inorganicos; y otras 15 estaciones fueron muestreadas solamente durante invierno en una region mas amplia. Se utilizaron imagenes de satelite (MODIS-AQUA L2) para obtener valores de temperatura superficial del mar (TSM) y clorofila (Chl-a); y datos de altimetria para identificar estructuras dinamicas de mesoescala en la region. Durante invierno-primavera se encontraron valores altos de salinidad (34,6), valores bajos de nitratos y nitritos (~3-4 µM), silicatos (5-7 µM) y clorofila (~10 mg m-3); como tambien valores bajos de temperatura (~23,5°C) y la presencia de giros ciclonicos cerca de la costa. Esto coincidio con la riqueza mayor (de 5 a 9 especies dependiendo la escala espacial) de mamiferos marinos en la zona. La especie dominante fue Megaptera novaeangliae (0,092 avistamientos km-1), la cual se distribuyo hacia zonas costeras en aguas someras. Durante verano-otono se registraron valores bajos de salinidad (32,8) y Chl-a (0,1 mg m-3). Se detecto una disponibilidad alta de fosfatos (2,5 µM), la presencia de giros anticiclonicos y temperaturas altas (~31°C), coincidiendo con la riqueza mas baja (3 especies) de mamiferos marinos. Stenella attenuata fue la especie dominante (0,036 avistamientos km-1), cuyos individuos fueron encontrados distribuidos cerca de las costas de Jalisco y Colima (0-3mn), en aguas someras con una disponibilidad alta de nutrientes inorganicos. El analisis de componentes principales mostro que la batimetria (99.6%) fue el principal parametro que explica la varianza de los datos, por lo que podria potencialmente modular aspectos ecologicos de los mamiferos marinos. EnglishThe oceanographic conditions that could influence richness and distribution of marine mammal species in the coastal area of the Mexican Central Pacific (MCP) were investigated throughout 2011. Marine mammals observations were obtained from two research platforms. CTD casts were deployed down to 100 m, water samples were taken monthly at six stations for determination of organic nutrients, and another 15 stations were sampled over a wider area only during the winter. Satellite images from MODIS-AQUA L2 were used to obtain sea surface temperature (SST) and chlorophyll-a (Chl-a) values, likewise altimetry data to identify mesoscale dynamic structures in the region. High salinity values (34.6), low concentrations of nitrates and nitrites (~3-4 µM), silicates (5-7 µM), Chl-a (~10 mg m-3), and low SST (~23.5°C) were detected, as well as the presence of cyclonic gyres near the coast during the winter-spring period. This coincided with high mari
{"title":"Oceanographic conditions and marine mammals: identifying a potential relationship in the coastal region of the Mexican Central Pacific","authors":"Tadashi Kono-Martínez, Christian D. Ortega‐Ortiz, A. Olivos-Ortiz, E. Torres-Orozco, E. González-Rodríguez","doi":"10.4067/S0718-19572017000300006","DOIUrl":"https://doi.org/10.4067/S0718-19572017000300006","url":null,"abstract":"espanolSe investigaron las condiciones oceanograficas que podrian influir en la riqueza y distribucion de mamiferos marinos en costas del Pacifico Central Mexicano durante el 2011. Las observaciones de mamiferos marinos se realizaron desde dos plataformas de investigacion. Se muestrearon mensualmente 6 estaciones, donde se realizaron lances de CTD hasta 100 m y se tomaron muestras de agua para determinacion de nutrientes inorganicos; y otras 15 estaciones fueron muestreadas solamente durante invierno en una region mas amplia. Se utilizaron imagenes de satelite (MODIS-AQUA L2) para obtener valores de temperatura superficial del mar (TSM) y clorofila (Chl-a); y datos de altimetria para identificar estructuras dinamicas de mesoescala en la region. Durante invierno-primavera se encontraron valores altos de salinidad (34,6), valores bajos de nitratos y nitritos (~3-4 µM), silicatos (5-7 µM) y clorofila (~10 mg m-3); como tambien valores bajos de temperatura (~23,5°C) y la presencia de giros ciclonicos cerca de la costa. Esto coincidio con la riqueza mayor (de 5 a 9 especies dependiendo la escala espacial) de mamiferos marinos en la zona. La especie dominante fue Megaptera novaeangliae (0,092 avistamientos km-1), la cual se distribuyo hacia zonas costeras en aguas someras. Durante verano-otono se registraron valores bajos de salinidad (32,8) y Chl-a (0,1 mg m-3). Se detecto una disponibilidad alta de fosfatos (2,5 µM), la presencia de giros anticiclonicos y temperaturas altas (~31°C), coincidiendo con la riqueza mas baja (3 especies) de mamiferos marinos. Stenella attenuata fue la especie dominante (0,036 avistamientos km-1), cuyos individuos fueron encontrados distribuidos cerca de las costas de Jalisco y Colima (0-3mn), en aguas someras con una disponibilidad alta de nutrientes inorganicos. El analisis de componentes principales mostro que la batimetria (99.6%) fue el principal parametro que explica la varianza de los datos, por lo que podria potencialmente modular aspectos ecologicos de los mamiferos marinos. EnglishThe oceanographic conditions that could influence richness and distribution of marine mammal species in the coastal area of the Mexican Central Pacific (MCP) were investigated throughout 2011. Marine mammals observations were obtained from two research platforms. CTD casts were deployed down to 100 m, water samples were taken monthly at six stations for determination of organic nutrients, and another 15 stations were sampled over a wider area only during the winter. Satellite images from MODIS-AQUA L2 were used to obtain sea surface temperature (SST) and chlorophyll-a (Chl-a) values, likewise altimetry data to identify mesoscale dynamic structures in the region. High salinity values (34.6), low concentrations of nitrates and nitrites (~3-4 µM), silicates (5-7 µM), Chl-a (~10 mg m-3), and low SST (~23.5°C) were detected, as well as the presence of cyclonic gyres near the coast during the winter-spring period. This coincided with high mari","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41541596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-01DOI: 10.4067/S0718-19572017000300004
P. Santander, E. Rojas, M. Moraga, C. Salinas
espanolSe analizo la relacion entre el bacterioplancton y las condiciones oceanograficas en un area de surgencia en el norte de Chile, mediante aproximacion basada en las abundancias y tamanos celulares. El area de estudio fue bahia Chipana (21°20'S), se analizaron los veranos del 2004-2006 y los inviernos 2005-2007. La temperatura, salinidad y oxigeno se registraron mediante un CTD, las muestras de bacterioplancton y clorofila-a fueron obtenidas a profundidades estandares. La variabilidad de la estructura fisica de la columna de agua se asocio a eventos de surgencia, bajo la influencia de la zona de minimos de oxigeno y eventos El Nino-La Nina. La mayor abundancia del bacterioplancton se observo en diciembre 2004 y julio 2005, asociadas al margen costero (1,07×10(9)-5,12×10(9) cel L-1 y 1,44×10(9) cel L-1, respectivamente). Para el 2006 y 2007, se detecto una menor abundancia en el margen costero y en la capa superficial de las estaciones mas alejadas de la costa, los valores fluctuaron entre 6,77×10(7)-3,67×10(9) cel L-1, respectivamente. El uso de modelos aditivos generalizados, permitio determinar que la salinidad, estabilidad de la columna de agua y biomasa del fitoplancton tuvieron un efecto significativo sobre la abundancia procariota. Los mayores volumenes celulares se asociaron a las menores abundancias, siendo la estructura de tamano dominante 0,4-0,8 y 0,8-1,2 µm de longitud. Este estudio sugiere que la abundancia y el tamano celular del bacterioplancton sufren variaciones temporales que se relacionan a factores fisicos, principalmente la salinidad y estabilidad de la columna de agua. La transicion observada entre eventos El Nino-La Nina genera cambios en la columna de agua asociados a una profundizacion de la termoclina, que expande y contrae la OMZ, que finalmente podrian afectar la capacidad productiva del bacterioplancton. EnglishThe relationship between bacterioplankton and oceanographic conditions of an upwelling area of northern Chile was analyzed, during two contrasting seasons, emphasizing an approach based in the abundance and size structure. The study area was Chipana Bay (21°20'S), and analyzed the summers of 2004-2006 and winters of 2005-2007. The temperature, salinity and oxygen were recorded with a CTD and the bacterioplankton and chlorophyll-a samples were obtained at standards depths. The variability of the physical structure of the water column was associated with upwelling, under the influence of the oxygen minimum zone and El Nino-La Nina events. The higher abundance of bacterioplankton was observed in December 2004 and July 2005, (1.07×10(9)-5.12×10(9) cell L-1 and 1.44×10(9) cell L-1, respectively), associated with coastal margin and surface water away from the coast. For 2006 and 2007, a lower abundance was detected in the coastal margin and in the surface layer of the offshore stations, the values fluctuated between 6.77 × 10(7)-3.67 × 10(9) cells L-1, respectively. The use of generalized additive models determi
{"title":"Respuesta de la abundancia y estructura de tamaño del bacterioplancton a diferentes condiciones oceanográficas en bahía Chipana (21°20'S)","authors":"P. Santander, E. Rojas, M. Moraga, C. Salinas","doi":"10.4067/S0718-19572017000300004","DOIUrl":"https://doi.org/10.4067/S0718-19572017000300004","url":null,"abstract":"espanolSe analizo la relacion entre el bacterioplancton y las condiciones oceanograficas en un area de surgencia en el norte de Chile, mediante aproximacion basada en las abundancias y tamanos celulares. El area de estudio fue bahia Chipana (21°20'S), se analizaron los veranos del 2004-2006 y los inviernos 2005-2007. La temperatura, salinidad y oxigeno se registraron mediante un CTD, las muestras de bacterioplancton y clorofila-a fueron obtenidas a profundidades estandares. La variabilidad de la estructura fisica de la columna de agua se asocio a eventos de surgencia, bajo la influencia de la zona de minimos de oxigeno y eventos El Nino-La Nina. La mayor abundancia del bacterioplancton se observo en diciembre 2004 y julio 2005, asociadas al margen costero (1,07×10(9)-5,12×10(9) cel L-1 y 1,44×10(9) cel L-1, respectivamente). Para el 2006 y 2007, se detecto una menor abundancia en el margen costero y en la capa superficial de las estaciones mas alejadas de la costa, los valores fluctuaron entre 6,77×10(7)-3,67×10(9) cel L-1, respectivamente. El uso de modelos aditivos generalizados, permitio determinar que la salinidad, estabilidad de la columna de agua y biomasa del fitoplancton tuvieron un efecto significativo sobre la abundancia procariota. Los mayores volumenes celulares se asociaron a las menores abundancias, siendo la estructura de tamano dominante 0,4-0,8 y 0,8-1,2 µm de longitud. Este estudio sugiere que la abundancia y el tamano celular del bacterioplancton sufren variaciones temporales que se relacionan a factores fisicos, principalmente la salinidad y estabilidad de la columna de agua. La transicion observada entre eventos El Nino-La Nina genera cambios en la columna de agua asociados a una profundizacion de la termoclina, que expande y contrae la OMZ, que finalmente podrian afectar la capacidad productiva del bacterioplancton. EnglishThe relationship between bacterioplankton and oceanographic conditions of an upwelling area of northern Chile was analyzed, during two contrasting seasons, emphasizing an approach based in the abundance and size structure. The study area was Chipana Bay (21°20'S), and analyzed the summers of 2004-2006 and winters of 2005-2007. The temperature, salinity and oxygen were recorded with a CTD and the bacterioplankton and chlorophyll-a samples were obtained at standards depths. The variability of the physical structure of the water column was associated with upwelling, under the influence of the oxygen minimum zone and El Nino-La Nina events. The higher abundance of bacterioplankton was observed in December 2004 and July 2005, (1.07×10(9)-5.12×10(9) cell L-1 and 1.44×10(9) cell L-1, respectively), associated with coastal margin and surface water away from the coast. For 2006 and 2007, a lower abundance was detected in the coastal margin and in the surface layer of the offshore stations, the values fluctuated between 6.77 × 10(7)-3.67 × 10(9) cells L-1, respectively. The use of generalized additive models determi","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48375084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-01DOI: 10.4067/S0718-19572017000300003
Miguel Angel Díaz-Flores, D. A. Salas-de-León, M. Monreal-Gómez
espanolEl oceano se caracteriza por una circulacion dominada por giros de diferentes tamanos; los giros juegan un papel muy importante en el clima oceanico ya que transportan energia, masa y diversos organismos. Su estudio es por tanto de primera importancia para entender los diferentes procesos que ocurren en los mares a diferentes escalas espacio -temporales. La Bahia de Campeche, en el sur del Golfo de Mexico se caracteriza por tener una circulacion de tipo ciclonica. Con la finalidad de identificar el origen y la formacion del giro ciclonico se analizaron datos de corrientes registradas en una campana oceanografica y datos de altimetria del mar obtenidos con sensores remotos. De los resultados obtenidos se deduce que la formacion de los giros ciclonicos de la Bahia de Campeche depende principalmente de la conservacion de la vorticidad potencial. EnglishThe ocean is characterized by a circulation dominated by vortex of different sizes; the vortex play a very important role in the oceanic climate as they transport energy, mass and organisms. Their study is therefore of first importance to understand the different processes that occurring in the seas at different time-space scales. The Bay of Campeche, in the southern Gulf of Mexico, is characterized by a cyclonic circulation. With the aim of identifying the origin and the formation of the cyclonic vortex, data of currents registered in an oceanographic survey and data of sea altimetry obtained with remote sensors were analyzed. From the results, the formation of the cyclonic vortex of the Bay of Campeche depends mainly on the conservation of the potential vorticity.
{"title":"Origen y evolución del giro ciclónico de la Bahía de Campeche, Golfo de México","authors":"Miguel Angel Díaz-Flores, D. A. Salas-de-León, M. Monreal-Gómez","doi":"10.4067/S0718-19572017000300003","DOIUrl":"https://doi.org/10.4067/S0718-19572017000300003","url":null,"abstract":"espanolEl oceano se caracteriza por una circulacion dominada por giros de diferentes tamanos; los giros juegan un papel muy importante en el clima oceanico ya que transportan energia, masa y diversos organismos. Su estudio es por tanto de primera importancia para entender los diferentes procesos que ocurren en los mares a diferentes escalas espacio -temporales. La Bahia de Campeche, en el sur del Golfo de Mexico se caracteriza por tener una circulacion de tipo ciclonica. Con la finalidad de identificar el origen y la formacion del giro ciclonico se analizaron datos de corrientes registradas en una campana oceanografica y datos de altimetria del mar obtenidos con sensores remotos. De los resultados obtenidos se deduce que la formacion de los giros ciclonicos de la Bahia de Campeche depende principalmente de la conservacion de la vorticidad potencial. EnglishThe ocean is characterized by a circulation dominated by vortex of different sizes; the vortex play a very important role in the oceanic climate as they transport energy, mass and organisms. Their study is therefore of first importance to understand the different processes that occurring in the seas at different time-space scales. The Bay of Campeche, in the southern Gulf of Mexico, is characterized by a cyclonic circulation. With the aim of identifying the origin and the formation of the cyclonic vortex, data of currents registered in an oceanographic survey and data of sea altimetry obtained with remote sensors were analyzed. From the results, the formation of the cyclonic vortex of the Bay of Campeche depends mainly on the conservation of the potential vorticity.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000300003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48235127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200013
Rafael Ricardo Torres-Parra, Diana Margarita Sánchez-Reyes, Maritza Y Moreno-Calderón
espanolEl ciclo estacional del nivel del mar fue analizado en el Archipielago de San Andres, Providencia y Santa Catalina en el Mar Caribe con base en 22 anos de topografia dinamica absoluta. Se encontro gran variacion espacial en el espectro estacional del nivel del mar en las 9 principales geoformas que componen el archipielago dependiendo de su posicion meridional y como consecuencia de diferentes forzantes de este ciclo presentes en la Cuenca Colombia. La variacion anual del nivel del mar tiene un rango minimo de 2,7 cm en Quitasueno y un rango maximo de 9,5 cm en Roncador. En el norte del archipielago el ciclo estacional es maximo entre julio y agosto, y minimo entre enero y marzo; por el contrario en el sur del archipielago el ciclo estacional es maximo entre febrero y marzo y minimo entre agosto y septiembre. El ciclo estacional explica entre el 3 y el 23% de la variacion mensual del nivel del mar en el archipielago y no es constante en el tiempo; se encontraron cambios de hasta 3,6 cm en amplitud y de 83o de fase cuando el ciclo anual fue evaluado fraccionando la serie de tiempo en segmentos de 5 anos. La contribucion del ciclo estacional debe incluirse para la evaluacion de riesgos asociada a valores extremos del nivel del mar en el archipielago. EnglishThe sea level seasonal cycle was assessed in the San Andres, Providencia and Santa Catalina Archipelago in the Caribbean Sea using 22 years of absolute dynamic topography. Large spatial variability was found in the sea level seasonal spectrum in the 9 most important geographical features that constitute the archipelago, depending on their meridional position and as consequence of different forcings for this cycle present in the Colombian Basin. The sea level annual variation has a minimal range of 2.7 cm in Quitasueno and a maximum range of 9.5 cm in Roncador. The seasonal cycle is maximum in July-August and minimum in January-March toward the north of the archipelago; on the contrary, the seasonal cycle is maximum in February-March and minimum in August-September toward the south of the archipelago. The seasonal cycle explains between the 3 and 23% of the monthly sea level variation in the archipelago and it is not steady in time; changes up to 3.6 cm were found in the amplitude and 83o in the phase lag when the annual cycle was assessed fractionating the time series in 5-year segments. The seasonal cycle contribution must be included in the archipelago's risk assessment associated to sea level extreme values.
{"title":"Variación estacional del nivel del mar en el Archipiélago de San Andrés, Providencia y Santa Catalina, Mar Caribe","authors":"Rafael Ricardo Torres-Parra, Diana Margarita Sánchez-Reyes, Maritza Y Moreno-Calderón","doi":"10.4067/S0718-19572017000200013","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200013","url":null,"abstract":"espanolEl ciclo estacional del nivel del mar fue analizado en el Archipielago de San Andres, Providencia y Santa Catalina en el Mar Caribe con base en 22 anos de topografia dinamica absoluta. Se encontro gran variacion espacial en el espectro estacional del nivel del mar en las 9 principales geoformas que componen el archipielago dependiendo de su posicion meridional y como consecuencia de diferentes forzantes de este ciclo presentes en la Cuenca Colombia. La variacion anual del nivel del mar tiene un rango minimo de 2,7 cm en Quitasueno y un rango maximo de 9,5 cm en Roncador. En el norte del archipielago el ciclo estacional es maximo entre julio y agosto, y minimo entre enero y marzo; por el contrario en el sur del archipielago el ciclo estacional es maximo entre febrero y marzo y minimo entre agosto y septiembre. El ciclo estacional explica entre el 3 y el 23% de la variacion mensual del nivel del mar en el archipielago y no es constante en el tiempo; se encontraron cambios de hasta 3,6 cm en amplitud y de 83o de fase cuando el ciclo anual fue evaluado fraccionando la serie de tiempo en segmentos de 5 anos. La contribucion del ciclo estacional debe incluirse para la evaluacion de riesgos asociada a valores extremos del nivel del mar en el archipielago. EnglishThe sea level seasonal cycle was assessed in the San Andres, Providencia and Santa Catalina Archipelago in the Caribbean Sea using 22 years of absolute dynamic topography. Large spatial variability was found in the sea level seasonal spectrum in the 9 most important geographical features that constitute the archipelago, depending on their meridional position and as consequence of different forcings for this cycle present in the Colombian Basin. The sea level annual variation has a minimal range of 2.7 cm in Quitasueno and a maximum range of 9.5 cm in Roncador. The seasonal cycle is maximum in July-August and minimum in January-March toward the north of the archipelago; on the contrary, the seasonal cycle is maximum in February-March and minimum in August-September toward the south of the archipelago. The seasonal cycle explains between the 3 and 23% of the monthly sea level variation in the archipelago and it is not steady in time; changes up to 3.6 cm were found in the amplitude and 83o in the phase lag when the annual cycle was assessed fractionating the time series in 5-year segments. The seasonal cycle contribution must be included in the archipelago's risk assessment associated to sea level extreme values.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45786356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200004
Helena A. Kehrig, G. Baptista, Ana Paula Madeira Di Beneditto, M. Almeida, Carlos Eduardo de Rezende, Salvatore Siciliano, Jailson Fulgencio de Moura, Isabel Moreira
An assessment of mercury (Hg) concentrations and nitrogen stable isotope (15N) was conducted in the food chain of the Atlantic spotted dolphin (Stenella frontalis), including phytoplankton, zooplankton, planktivorous fish and its major prey (predatory fish and a single species of cephalopod), that compose a tropical trophic chain of the Brazilian southeastern coast. Tissue concentrations of Hg in a voracious predator fish, the largehead hairtail (Trichiurus lepturus), one of the dolphin’s prey, were 9.8 times lower than median concentrations found in dolphin tissues. 15N values in predatory fish were found to be lower to those of its predator the spotted dolphin. Isotopic data suggested significant differences for 15N along the trophic chain, with the top predator (dolphin) exhibiting heavier value, followed by the voracious predator fish and the benthonic carnivorous fish, the whitemouth croaker (Micropogonias furnieri). Phytoplankton displayed the lightest 15N, followed by zooplankton and the planktophagous fish, the lebranche mullet (Mugil liza). This fish species and the cephalopod showed the lowest median Hg concentration. All links of the entire trophic chain presented trophic transfer of Hg with a biomagnification factor higher than 1. A significant relationship was found between the log Hg concentration and trophic level (TL) of all evaluated species, with a positive slope (= 0.87). The calculated trophic magnification factor (TMF= 7.44) indicates that Hg concentration increased per TL, and also that the entire coastal food chain from the South Atlantic Ocean presented a biomagnification power of Hg within a range previously reported for tropical coastal ecosystems.
{"title":"Biomagnificación de mercurio en la cadena trófica del Delfín Moteado del Atlántico(Stenella frontalis), usando el isótopo estable de nitrógeno como marcador ecológico","authors":"Helena A. Kehrig, G. Baptista, Ana Paula Madeira Di Beneditto, M. Almeida, Carlos Eduardo de Rezende, Salvatore Siciliano, Jailson Fulgencio de Moura, Isabel Moreira","doi":"10.4067/S0718-19572017000200004","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200004","url":null,"abstract":"An assessment of mercury (Hg) concentrations and nitrogen stable isotope (15N) was conducted in the food chain of the \u0000Atlantic spotted dolphin (Stenella frontalis), including phytoplankton, zooplankton, planktivorous fish and its major prey (predatory \u0000fish and a single species of cephalopod), that compose a tropical trophic chain of the Brazilian southeastern coast. Tissue \u0000concentrations of Hg in a voracious predator fish, the largehead hairtail (Trichiurus lepturus), one of the dolphin’s prey, were 9.8 \u0000times lower than median concentrations found in dolphin tissues. 15N values in predatory fish were found to be lower to those of \u0000its predator the spotted dolphin. Isotopic data suggested significant differences for 15N along the trophic chain, with the top \u0000predator (dolphin) exhibiting heavier value, followed by the voracious predator fish and the benthonic carnivorous fish, the \u0000whitemouth croaker (Micropogonias furnieri). Phytoplankton displayed the lightest 15N, followed by zooplankton and the \u0000planktophagous fish, the lebranche mullet (Mugil liza). This fish species and the cephalopod showed the lowest median Hg \u0000concentration. All links of the entire trophic chain presented trophic transfer of Hg with a biomagnification factor higher than 1. \u0000A significant relationship was found between the log Hg concentration and trophic level (TL) of all evaluated species, with a \u0000positive slope (= 0.87). The calculated trophic magnification factor (TMF= 7.44) indicates that Hg concentration increased per TL, \u0000and also that the entire coastal food chain from the South Atlantic Ocean presented a biomagnification power of Hg within a range \u0000previously reported for tropical coastal ecosystems.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000200004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42419100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200005
Cristián G. Suazo, O. Yates, J. Azócar, Pablo E. Díaz, J. C. González-But, Luis A. Cabezas
espanolLas especies de aves marinas longevas, tales como albatros y petreles ampliamente distribuidos en el mar y con poblaciones reducidas, tienen a la captura incidental en pesquerias como una de las principales amenazas para su conservacion. Entre estas, el albatros de Galapagos Phoebastria irrorata es escasamente detectado en las Zonas Economicas Exclusivas (ZEE) de paises mas alla de su distribucion tradicional a lo largo del Pacifico Sudeste. En este articulo se recopilan registros distribucionales del albatros de Galapagos in situ y obtenidos desde observaciones no sistematicas en el mar, tales como actividades de turismo (i.e., observacion pelagica de aves) desde la decada de 1980s en adelante. A su vez, se incorporan registros desde monitoreos sistematicos en pesquerias de palangre y arrastre, operando entre el norte y centro-sur de Chile (Pacifico Sudeste). La ocurrencia de avistamientos fue analizada segun caracteristicas ambientales relacionadas a estos, como presencia/ausencia de periodo reproductivo e indicadores de eventos El Nino, tal como valores negativos en el Indice de Oscilacion Sur (IOS), entre otros. Se describio un total de 13 avistamientos del albatros de Galapagos y con 76,9% de estos fuera de su periodo reproductivo (diciembre a abril). Los registros evidencian una distribucion meridional del albatros de Galapagos hasta el centro-sur de Chile (38°S), alcanzando 4.391 km al sur de Islas Galapagos, asi como hasta 920 km al oeste (79°O) desde la costa Sudamericana. El albatros de Galapagos fue registrado en asociacion con pesquerias industriales de palangre pelagico y arrastre demersal. No hubo registros de captura incidental, aunque la observacion de individuos asociados a barcos de estas pesquerias para alimentarse de descartes y eviscerados sugiere un potencial riesgo de mortalidad para esta especie. El 53,8% de los avistamientos fueron durante lecturas positivas del Indice de Oscilacion Sur (IOS), representando condiciones mas frias que las neutrales de El Nino Oscilacion Sur (ENOS). EnglishLong-lived seabird species such as albatrosses and petrels, which are widely distributed at sea and have small populations are threatened globally by bycatch in fisheries. Among these, the waved albatross Phoebastria irrorata is scarcely detected in the Exclusive Economic Zones (EEZs) of countries beyond its traditional distribution throughout the Southeast Pacific. In this article, in situ distributional records on the waved albatross obtained from non-systematic (pelagic birdwatching) and systematic (fishery monitoring) records were compiled. Occurrence of sightings was carried out in relation to recording traits as presence/absence of breeding period and El Nino proxies such as the Southern Oscillation Index (SOI), among others. A total of 13 sightings of waved albatrosses was described which 76.9% of sightings were related to non-breeding period (December to April). Records indicated waved albatrosses reached 4,391 km south of t
{"title":"Emerging platforms to monitor the occurrence and threats to critically endangered seabirds: The waved albatross in Chile and the Southeast Pacific","authors":"Cristián G. Suazo, O. Yates, J. Azócar, Pablo E. Díaz, J. C. González-But, Luis A. Cabezas","doi":"10.4067/S0718-19572017000200005","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200005","url":null,"abstract":"espanolLas especies de aves marinas longevas, tales como albatros y petreles ampliamente distribuidos en el mar y con poblaciones reducidas, tienen a la captura incidental en pesquerias como una de las principales amenazas para su conservacion. Entre estas, el albatros de Galapagos Phoebastria irrorata es escasamente detectado en las Zonas Economicas Exclusivas (ZEE) de paises mas alla de su distribucion tradicional a lo largo del Pacifico Sudeste. En este articulo se recopilan registros distribucionales del albatros de Galapagos in situ y obtenidos desde observaciones no sistematicas en el mar, tales como actividades de turismo (i.e., observacion pelagica de aves) desde la decada de 1980s en adelante. A su vez, se incorporan registros desde monitoreos sistematicos en pesquerias de palangre y arrastre, operando entre el norte y centro-sur de Chile (Pacifico Sudeste). La ocurrencia de avistamientos fue analizada segun caracteristicas ambientales relacionadas a estos, como presencia/ausencia de periodo reproductivo e indicadores de eventos El Nino, tal como valores negativos en el Indice de Oscilacion Sur (IOS), entre otros. Se describio un total de 13 avistamientos del albatros de Galapagos y con 76,9% de estos fuera de su periodo reproductivo (diciembre a abril). Los registros evidencian una distribucion meridional del albatros de Galapagos hasta el centro-sur de Chile (38°S), alcanzando 4.391 km al sur de Islas Galapagos, asi como hasta 920 km al oeste (79°O) desde la costa Sudamericana. El albatros de Galapagos fue registrado en asociacion con pesquerias industriales de palangre pelagico y arrastre demersal. No hubo registros de captura incidental, aunque la observacion de individuos asociados a barcos de estas pesquerias para alimentarse de descartes y eviscerados sugiere un potencial riesgo de mortalidad para esta especie. El 53,8% de los avistamientos fueron durante lecturas positivas del Indice de Oscilacion Sur (IOS), representando condiciones mas frias que las neutrales de El Nino Oscilacion Sur (ENOS). EnglishLong-lived seabird species such as albatrosses and petrels, which are widely distributed at sea and have small populations are threatened globally by bycatch in fisheries. Among these, the waved albatross Phoebastria irrorata is scarcely detected in the Exclusive Economic Zones (EEZs) of countries beyond its traditional distribution throughout the Southeast Pacific. In this article, in situ distributional records on the waved albatross obtained from non-systematic (pelagic birdwatching) and systematic (fishery monitoring) records were compiled. Occurrence of sightings was carried out in relation to recording traits as presence/absence of breeding period and El Nino proxies such as the Southern Oscillation Index (SOI), among others. A total of 13 sightings of waved albatrosses was described which 76.9% of sightings were related to non-breeding period (December to April). Records indicated waved albatrosses reached 4,391 km south of t","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000200005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49556416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200017
Sergio Néstor Bolasina, Nicolás Benedetti
espanolEl objetivo del presente trabajo fue evaluar los efectos del reemplazo parcial (50%) de la harina de pescado por harina de carne bovina en dietas formuladas para juveniles de corvina rubia, Micropogonias furnieri. Se determino el crecimiento, la eficiencia de conversion del alimento, la digestibilidad aparente de proteinas y lipidos y la supervivencia utilizando dos tipos de dietas isonitrogenadas (proteina cruda 38%), control y reemplazo. El incremento en longitud (cm) y en peso (g) fue mayor en los ejemplares alimentados con la dieta control (10,34 y 9,77% respectivamente), a los que se les suministro la dieta con reemplazo el incremento fue del 6,78 y 7,10%, respectivamente. La supervivencia fue similar para los ejemplares alimentados con la dieta control (88,9%) que con la dieta de reemplazo (86,3%). La digestibilidad aparente de proteinas para los individuos alimentados con la dieta control fue del 88,8%, para los individuos alimentados con la dieta con reemplazo de harina de carne el valor obtenido fue del 85,9%. El porcentaje de digestibilidad aparente para lipidos totales fue similar para ambos tratamientos (96,6 y 96,8%). La composicion proximal de proteina y lipidos en musculo no vario significativamente con los tratamientos. Se concluye que la harina de carne puede utilizarse como fuente alternativa de reemplazo de la harina de pescado para la fabricacion de dietas utilizadas en el engorde de Micropogonias furnieri. Se requiere continuar las investigaciones para aumentar el conocimiento de los requerimientos nutricionales de esta especie. EnglishThe aim of this study was to evaluate the effects of partial replacement (50%) of fish meal by bovine meat meal in diets formulated for juvenile whitemouth croaker, Micropogonias furnieri. The growth, feed conversion, apparent digestibility of proteins and lipids and survival of fish fed with both diets was determined. The increase in length (cm) and weight (g) was similar in fish fed with control diet (10.34 and 9.77%, respectively), compared with replacement diet (6.78 and 7.10%, respectively). Survival rate was similar in fish fed with control diet (88.9%) than the replacement diet (86.3%). Protein apparent digestibility of control and replacement diet was 88.8%, and 85.9%, respectively. Lipid apparent digestibility was similar for both treatments (96.6 and 96.8%). The proximate composition of protein and lipids in muscle did not vary between treatments. It is concluded that meat meal could serve as an alternative source replacement of fish meal in diets for Micropogonias furnieri. It is necessary to continue this research in order to increase the understanding of the nutritional requirements of this species.
{"title":"Evaluación de dietas formuladas para la corvina rubia, Micropogonias furnieri (Osteichthyes: Sciaenidae)","authors":"Sergio Néstor Bolasina, Nicolás Benedetti","doi":"10.4067/S0718-19572017000200017","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200017","url":null,"abstract":"espanolEl objetivo del presente trabajo fue evaluar los efectos del reemplazo parcial (50%) de la harina de pescado por harina de carne bovina en dietas formuladas para juveniles de corvina rubia, Micropogonias furnieri. Se determino el crecimiento, la eficiencia de conversion del alimento, la digestibilidad aparente de proteinas y lipidos y la supervivencia utilizando dos tipos de dietas isonitrogenadas (proteina cruda 38%), control y reemplazo. El incremento en longitud (cm) y en peso (g) fue mayor en los ejemplares alimentados con la dieta control (10,34 y 9,77% respectivamente), a los que se les suministro la dieta con reemplazo el incremento fue del 6,78 y 7,10%, respectivamente. La supervivencia fue similar para los ejemplares alimentados con la dieta control (88,9%) que con la dieta de reemplazo (86,3%). La digestibilidad aparente de proteinas para los individuos alimentados con la dieta control fue del 88,8%, para los individuos alimentados con la dieta con reemplazo de harina de carne el valor obtenido fue del 85,9%. El porcentaje de digestibilidad aparente para lipidos totales fue similar para ambos tratamientos (96,6 y 96,8%). La composicion proximal de proteina y lipidos en musculo no vario significativamente con los tratamientos. Se concluye que la harina de carne puede utilizarse como fuente alternativa de reemplazo de la harina de pescado para la fabricacion de dietas utilizadas en el engorde de Micropogonias furnieri. Se requiere continuar las investigaciones para aumentar el conocimiento de los requerimientos nutricionales de esta especie. EnglishThe aim of this study was to evaluate the effects of partial replacement (50%) of fish meal by bovine meat meal in diets formulated for juvenile whitemouth croaker, Micropogonias furnieri. The growth, feed conversion, apparent digestibility of proteins and lipids and survival of fish fed with both diets was determined. The increase in length (cm) and weight (g) was similar in fish fed with control diet (10.34 and 9.77%, respectively), compared with replacement diet (6.78 and 7.10%, respectively). Survival rate was similar in fish fed with control diet (88.9%) than the replacement diet (86.3%). Protein apparent digestibility of control and replacement diet was 88.8%, and 85.9%, respectively. Lipid apparent digestibility was similar for both treatments (96.6 and 96.8%). The proximate composition of protein and lipids in muscle did not vary between treatments. It is concluded that meat meal could serve as an alternative source replacement of fish meal in diets for Micropogonias furnieri. It is necessary to continue this research in order to increase the understanding of the nutritional requirements of this species.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44964410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200019
R. Urtubia, Pablo Gallardo, C. A. Cárdenas, P. Lavin, M. González-Aravena
The Patagonian toothfish Dissostichus eleginoides is one of the most important fisheries from the Southern Ocean. The biology of this species is relatively well studied and some nutritionals issues have also been reported; however there is no information about the composition of the bacterial community of the gastrointestinal tract, which is essential to characterize the microbiota of this fish. The bacterial flora of D. eleginoides is here described for the first time using culturable methods. By applying traditional culture-based techniques and 16S rDNA sequencing methods it was possible to characterize the families Vibronaceae and Moraxellaceae, which were mainly represented by Vibrio and Psychrobacter, respectively. This Patagonian fish shows a microbiota very similar to other cold waters fishes.
{"title":"First characterization of gastrointestinal culturable bacteria of Patagonian toothfish Dissostichus eleginoides (Nototheniidae)","authors":"R. Urtubia, Pablo Gallardo, C. A. Cárdenas, P. Lavin, M. González-Aravena","doi":"10.4067/S0718-19572017000200019","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200019","url":null,"abstract":"The Patagonian toothfish Dissostichus eleginoides is one of the most important fisheries from the Southern Ocean. The biology of this species is relatively well studied and some nutritionals issues have also been reported; however there is no information about the composition of the bacterial community of the gastrointestinal tract, which is essential to characterize the microbiota of this fish. The bacterial flora of D. eleginoides is here described for the first time using culturable methods. By applying traditional culture-based techniques and 16S rDNA sequencing methods it was possible to characterize the families Vibronaceae and Moraxellaceae, which were mainly represented by Vibrio and Psychrobacter, respectively. This Patagonian fish shows a microbiota very similar to other cold waters fishes.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000200019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48327481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.4067/S0718-19572017000200014
Julio Salcedo-Castro, Raúl Cruz-Gómez, A. W. Ratsimandresy, N. Silva
Time series of currents speed from 3 current meters moored at the mouth of Aysen Fjord, between October and November 1996, were analyze to estimate residual circulation and to relate surface flow to variations in salinity, wind and Aysen River runoff. Residual circulation and salinity at 6 m were determined by events of strong river discharge and relaxing of local wind. Periods of strong outflow and evident drop of salinity at the mouth of the fjord were preceded by a weakening of wind and in some cases were accompanied by an increase of Aysen river discharge. Moreover, the results confirm the 3-layer structure proposed for Aysen fjord, since seaward average currents were observed at 6 and 110 m depth, whereas weak transition average currents were observed at 50 m depth, representing a transition between an intermediate landward flow and the seaward bottom layer.
{"title":"Circulación residual en el fiordo Aysén, Chile, en condiciones de primavera","authors":"Julio Salcedo-Castro, Raúl Cruz-Gómez, A. W. Ratsimandresy, N. Silva","doi":"10.4067/S0718-19572017000200014","DOIUrl":"https://doi.org/10.4067/S0718-19572017000200014","url":null,"abstract":"Time series of currents speed from 3 current meters moored at the mouth of Aysen Fjord, between October and November 1996, were analyze to estimate residual circulation and to relate surface flow to variations in salinity, wind and Aysen River runoff. Residual circulation and salinity at 6 m were determined by events of strong river discharge and relaxing of local wind. Periods of strong outflow and evident drop of salinity at the mouth of the fjord were preceded by a weakening of wind and in some cases were accompanied by an increase of Aysen river discharge. Moreover, the results confirm the 3-layer structure proposed for Aysen fjord, since seaward average currents were observed at 6 and 110 m depth, whereas weak transition average currents were observed at 50 m depth, representing a transition between an intermediate landward flow and the seaward bottom layer.","PeriodicalId":54475,"journal":{"name":"Revista De Biologia Marina Y Oceanografia","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0718-19572017000200014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46591262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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