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Registros recuperados: 14
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Ecología trófica de estadios juveniles de los esciénidos dominantes en el estuario de Bahía Blanca. Pescadilla de red (Cynoscion guatucupa) y corvina rubia (Micropogonias furnieri) OceanDocs
Sardiña, P..
Striped weakfish (Cynoscion guatucupa)and whitemouth croaker(Micropogonias furnieri)are one of the most important coastal resources of Bahia Blanca Estuary (Buenos Aires Prov., Argentina). The aims of this thesis were: 1, to analyze the population and morphological characteristics of the juveniles stages of the striped weakfish and the whitemouth croaker living in Bahia Blanca Estuary; 2, to describe the dietary habits of the juveniles of these two species; 3, to analyze the ontogenetic and seasonal diet changes in both species, and 4, to study the feeding interrelationships between both species as well as the interrelationships between each species and its prey. In view of the mentioned objectives, diet was evaluated taking into account the following...
Tipo: Theses and Dissertations Palavras-chave: Brackishwater environment; Brackishwater fish; Comparative studies; Feeding behaviour; Trophic relationships; Zooplankton; Juveniles; Feeding behaviour; Zooplankton; Brackishwater environment; Juveniles; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_1050; Http://aims.fao.org/aos/agrovoc/c_25393.
Ano: 2004 URL: http://hdl.handle.net/1834/2595
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Ecological boundaries in estuaries: macrobenthic ß-diversity in the Rio de la Plata system (34-36°S) OceanDocs
Giberto, D.A.; Bremec, C.; Cortelezzi, A.; Rodrigues Capitulo, A.; Brazeiro, A..
In this study, we analyse spatial patterns of macrobenthic communities of the Río de la Plata system, and assess the species turnover or beta diversity and its relationship with environmental gradients. Macrobenthic samples and physico-chemical parameters were collected from 20 sampling sites along a transect of 560 km, including the freshwater (FW), estuarine (ES)and marine (MA)sectors. Three main assemblages corresponding to the above mentioned sectors were defined with multivariate analysis (cluster, MDS). In total 134 taxa were recorded, 81 in MA, 33 in FW and 38 in ES, represented mainly by polychaete, mollusc and crustacean species. Depth, salinity and clay showed the strongest correlation with the observed faunal patterns (pw=0.62; BIO-ENV...
Tipo: Journal Contribution Palavras-chave: Macrobenthos; Assemblages; Brackishwater environment; Estuaries; Estuaries; Macrobenthos; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_12312; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2007 URL: http://hdl.handle.net/1834/1571
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Estructura de la comunidad bentónica y ecología trófica de Scianeidae (Pisces: Osteichthyes) en el estuario del Río de la Plata OceanDocs
Giberto, D.A..
Benthic communities of the Río de la Plata estuary and their trophic link with Micropogonias furnieri, Paralonchurus brasiliensis, Menticirrhus americanus, Cynoscion guatucupa, Macrodon ancylodon and Umbrina canosai, six species of the Sciaenidae Family, were studied. Benthic composition was characterized using 122 sampling sites between 1999 and 2005. Multivariate and univariate statistical tools were used to analyze diversity, abundance and biomass patterns. A total of 370 taxa were found at the study area. Four areas were established using benthic composition: Inner Río de la Plata (RdP), middle RdP, outer RdP and Marine zone. Higher abundance (9,877 ind/m2) and biomass (1,456.8 g/m2) values were found at middle RdP. Nephtys fluviatilis, Heteromastus...
Tipo: Theses and Dissertations Palavras-chave: Benthos; Estuarine organisms; Brackishwater environment; Feeding behaviour; Food organisms; Trophic levels; Stomach content; Trophic levels; Benthos; Feeding behaviour; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_7969; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2008 URL: http://hdl.handle.net/1834/2952
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Estructura poblacional del gatuzo (Mustelus shmitti) en la costa bonaerense y uruguaya asociada a condiciones oceanográficas. OceanDocs
Massa, A.M..
The gatuzo, Mustelus schmitti, lives in the Southamerican Atlantic coastal waters from up to 23°S (Brazil)down to 47°S (Argentine), and is the greatest species of the Bonaerense and North Patagonian shores. This species is the most exploited elasmobranch of this region, within the last six years catch has exceeded 10,000 t per year and it is vulnerable to overexploitation due to reproductive aspects, with a low rate of changes, as well as distribution patterns. In order to relate size distribution and nursery areas, and environmental temperature and salinity variability, were obtained within six INIDEP 'Coastal Project' research cruises from 34° to 42°S from boundaries to 50 mts isobaths, during the spring seasons between 1994 to 1997. Cluster analysis...
Tipo: Theses and Dissertations Palavras-chave: Size distribution; Age composition; Sex ratio; Growth curves; Environmental effects; Brackishwater environment; Age composition; Sex ratio; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 1998 URL: http://hdl.handle.net/1834/3584
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Estudio de la composición específica, abundancia y distribución espacial del microzooplancton (protozoos y micrometazoos) en el estuario del Río de la Plata (Argentina-Uruguay) OceanDocs
Kogan, M..
Species composition, abundance and spatial distribution of microzooplancton (20-200 km)from the Río de la Plata Estuary, Argentina-Uruguay, SW Atlantic (36°S 56°W)were studied from samples collected during two oceanographic cruises at the end of austral spring (in 1999 and 2001)across a gradient from fluvial to coastal waters (200 km). Heterotrophic dinoflagellates, aloricate ciliates, tintinnids, radiolarians, rotifers and copepod nauplii were found. More than 110 taxa were registered, 35 were new records for the area. Three microzooplanktonic assemblages were distinguished using cluster analysis. Species and groups spatial distribution (horizontal and vertical)was related to the distribution of the maxima gradients (salinity, turbidity, etc.), estuarine...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Abundance; Geographical distribution; Salinity stratification; Ecological associations; Brackishwater environment; Community composition; Vertical distribution; Zooplankton; Geographical distribution; Ecological associations; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2005 URL: http://hdl.handle.net/1834/2598
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Interacciones biofísicas del ictioplancton frente a la Laguna Mar Chiquita OceanDocs
Ballesteros, G.; Ansay, C..
Tipo: Theses and Dissertations Palavras-chave: Ichthyoplankton; Brackishwater environment; Brackishwater fish; Estuarine dynamics; Coastal lagoons.
Ano: 2002 URL: http://hdl.handle.net/1834/4300
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La salinidad y la distribución espacial de la ictiofauna en el estuario del Río de la Plata OceanDocs
Rico, M.R..
Los ecosistemas estuariales se caracterizan por su alta productividad, baja diversidad biológica y fluctuaciones impredecibles de salinidad. A su vez, la distribución espacial de su ictiofauna resulta en general suficientemente explicada por los patrones de distribución de la salinidad. En particular, en el estuario del Río de la Plata (35° 00' S y 55° 30' W) que presenta una marcada estratificación vertical de densidad, dominada por la salinidad, se analizó cuantitativamente la relación entre dicha variable y la distribución espacial de su ictiofauna demersal. Se procesó y analizó información proveniente de siete campañas de evaluación pesquera realizadas por el Proyecto "Especies Demersales Costeras" del INIDEP en el área de estudio, durante las...
Tipo: Theses and Dissertations Palavras-chave: Brackishwater fish; Salinity charts; Salinity effects; Salinity tolerance; Community composition; Species diversity; Brackishwater environment; Estuaries; Estuaries; Species diversity; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2000 URL: http://hdl.handle.net/1834/2603
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Patrones de utilización de la laguna Mar Chiquita (Buenos Aires, Argentina) y área costera adyacente por parte de los primeros estadios ontogénicos de peces OceanDocs
Bruno, Daniel O..
The role of the Mar Chiquita lagoon and its adjacent coastal area as nursery ground for fish larvae and juveniles and the factors which regulate their recruitment process, was evaluated. To do so, we analyzed the fish early life stages composition and spatio-temporal variation over the marine-estuarine gradient of the lagoon and its relationship with environmental factors; the diel variation of these stages in the immediate area at the mouth of the lagoon; and the source of the organic carbon which feed them on the mouth of the lagoon and adjacent coastal area, by using stable isotope analysis. The richness and mean density of larvae were higher at the offshore area than at the lagoon. Inside the lagoon the dominant species in larval stage was Brevoortia...
Tipo: Theses and Dissertations Palavras-chave: Brackishwater fish; Fish larvae; Juveniles; Recruitment; Life cycle; Environmental factors; Abundance; Brackishwater environment; Coastal lagoons; Brevoortia aurea; Gobiosoma parri; Platanichthys platana; Ramnogaster arcuata; Odontesthes argentinensis; Engraulidae; Brackishwater environment.
Ano: 2014 URL: http://hdl.handle.net/1834/5819
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Relations between bacterial extracellular enzyme activities and heterotrophic substrate uptake in a brackishwater environment. ArchiMer
Hoppe, H.
Extracellular enzymes mediate the decomposition of polymeric organic compounds in natural waters. In many cases these enzymes comprise a component linked to the bacterial fraction of the aquatic community and react in close association with these cells. An annual survey of microbial activities in a brackish water fjord exhibited an excellent correlation between V sub(m) of proteases (ability to split the substrate analogue methylumbelliferyl-leucine) and V sub(m) as well as T sub(R) for leucine uptake by microorganisms. Hydrolysis rates (H sub(R)) for the decomposition of naturally occurring competitive substrate analogues of the model substrates (methylumbelliferyl-(MUF)-leucine, MUF- alpha -D-glucose, MUF-N-acetyl-glucosamine, MUF-phosphate) drastically...
Tipo: Text Palavras-chave: Biogeochemistry; Fjords; Bacteria; Brackishwater environment; Seasonal variations; Dissolved organic matter; Interspecific relationships; Hydrolysis; Enzymes.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-952.pdf
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Sampling for a bacteriological study of aquatic enrironments ArchiMer
Troussellier, M; Baleux, B; Andre, P.
Using water samples from several observation levels of a brackish lagoon, statistical solutions are offered for the sampling optimisation of bacteria viable counts. The variability between plate count is studied by the mean of the Taylor's power law. The sampling strategy optimisation, including several sources of variability, is realized by hierarchical analysis of variance and the estimation of the sampling cost of each source. This optimisation procedure results in a great increase of the relative efficiency of the sampling design and allow to obtain significant differences between the bacterial concentrations. The effect of the reduction of the total sampling effort on the precision of these average concentrations pointed out the scientific and...
Tipo: Text Palavras-chave: Bacteria; Abundance; Variance analysis; Microbiological analysis; Lagoons; Brackishwater environment; Bacterial counters; Biological sampling.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1984/acte-941.pdf
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Studies of the life-history and energetics of marine and brackish-water nematodes: 1. Demography of <i>Monhystera disjuncta</i> at different temperature and feeding conditions OMA
Vranken, G.; Herman, P.M.J.; Heip, C.H.R..
Aspects of the demography of <i>Monhystera disjuncta</i> were investigated at different feeding conditions (monoxenic cultures with different bacterial strains, and different densities in the feeding suspension with one strain). Embryonic development time, minimum generation time, egg deposition rate and adult longevity depend on temperature, quality and quantity of food offered. Body mass at maturity is an allometric function of food density. It is shown that a previously inferred selectivity in food uptake is an artifact of culture conditions. pH buffering and addition of sterols permit culture of the species on a wide variety of bacterial strains. <i>M. disjuncta</i> is less well adapted to take advantage of high food density...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioenergetics; Brackishwater environment; Cultured organisms; Feeding; Life history; Marine environment; Meiobenthos; Temperature effects; Water temperature; Monhystera disjuncta.
Ano: 1988 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3159
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Studies of the life-history and energetics of marine and brackish-water nematodes: 2. Production, respiration and food uptake by <i>Monhystera disjuncta</i> OMA
Herman, P.M.J.; Vranken, G..
An energy budget was constructed for the marine nematode <i>Monhystera disjuncta</i>. Respiration was measured with a modified Cartesian diver technique, in which the nematodes were kept in agar inside the diver 'head'. The relationship between respiration and body weight was: R=1.53 W<sup>0.75</sup>. Body growth was exponential during the juvenile phase, with a growth rate equal to 0.61 d<sup>-1</sup>. After maturation the growth rate fell to 0,17 d<sup>-1</sup>. Food uptake was measured in experiments with radiolabeled bacteria. In one series of experiments the accumulation of radiolabel in the nematodes was followed. In a second series the decrease in labeling was followed when pre-labeled nematodes fed on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioenergetics; Brackishwater environment; Energy budget; Energy flow; Feeding; Life history; Meiobenthos; Respiration; Monhystera disjuncta; Nematoda [Nematodes].
Ano: 1988 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3146
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Tramas tróficas en sistemas frontales del Mar Argentino: estructura, dinámica y complejidad analizada mediante isótopos estables OceanDocs
Gaitán, E.N..
Two of the most important frontal systems of the Argentine Sea (SW Atlantic Ocean) were compared to obtain evidences on the regulatory mechanisms of food web length, incorporating both spatial (areas within fronts) and temporal (presence or absence of frontal structure) variability. The stable isotopes of Carbon and Nitrogen were used to evaluate the origin and composition of the organic matter used by primary consumers, the structure of food webs, the trophic levels of several taxa and the benthic-pelagic coupling within each system. In the Río de la Plata estuarine front, different sources of organic matter would support the food webs occurring in the three areas of the system. The particulate organic material (POM) would be the main resource supporting...
Tipo: Theses and Dissertations Palavras-chave: Food webs; Trophic relationships; Trophic levels; Saline fronts; Estuarine front; Carbon isotopes; Nitrogen isotopes; Plankton; Benthos; Brackishwater fish; Marine fish; Brackishwater environment; Marine environment.
Ano: 2012 URL: http://hdl.handle.net/1834/4523
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Variación estacional del zooplancton en el sector estuarial de la laguna Mar Chiquita. Su relación con algunas variables ambientales. OceanDocs
Firpo, C..
El zooplancton de lagunas costeras se caracteriza por su baja diversidad y la dominancia de algunas especies que toleran sus condiciones ambientales cambiantes. La laguna costera Mar Chiquita está ubicada a los 37º32'S - 37º45’S y 57º19’-57º26’ W, posee un cuerpo lagunar de escasa profundidad y un canal por el cual se conecta con el mar, que posee características estuariales. Dada la escasa información referida al zooplancton de esta laguna el presente trabajo tiene como objetivo describir la taxocenosis del zooplancton, las variaciones estacionales de la abundancia y diversidad y la relación de dichas variaciones con la salinidad y temperatura, para dos estaciones ubicadas en el sector estuarial. Los muestreos mensuales se realizaron en dos estaciones...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Seasonal variations; Environmental conditions; Abundance; Community composition; Brackishwater environment; Coastal lagoons; Zooplankton; Environmental conditions; Coastal lagoons.
Ano: 2002 URL: http://hdl.handle.net/1834/3911
Registros recuperados: 14
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