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| 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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| 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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| Giberto, D.A.; Bremec, C.; Schejter, L.; Schiariti, A.; Mianzan, H.W.; Acha, E.M.. |
| Recent range extensions of the invasive rapa whelk Rapana venosa, biological data of the population and possible ecological impacts on the food webs of the Rio de la Plata estuary are presented. A total of 41 rapa whelks and 21 egg capsules were collected between February 2004 and March 2006. Specimens were found all over the mixohaline waters of the estuary, with records off Montevideo, Samborombon Bay and off Punta Rasa. Specimens ranged between 28 and 120 mm shell length. Almost all R. venosa presented epibionts all over the shell, suggesting an exposed lifestyle. Egg-masses were attached to specimens of R. venosa, debris and plastic garbage. The spatial distribution of R. venosa within the estuary was coupled with the spatial distribution of Mactra... |
| Tipo: Journal Contribution |
Palavras-chave: Estuaries; Introduced species; Predators; Food webs; Estuaries; Predators; Food webs; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_6163; Http://aims.fao.org/aos/agrovoc/c_10973. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1572 |
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| Bertelo, M.I.; Giberto, D.A.; Schiariti, A.; Bianca, F.; Suárez, J.; Mianzan, H.W.. |
| The first results in the development of a standardized methodology to estimate Mnemiopsis leidyi intake rates and their impact on fish recruitment are presented. M. leidyi capability to consume lyophilized fish eggs and level of consumption of such type of preys, Artemia nauplii and rotifera were assessed. Although M. leidyi can consume lyophilized fish eggs, intake rates were extremely low, often null and in all cases lower than those estimated for the other types of preys offered. The increase of feeding rate on each prey was proportional to ctenophores size growth. The results observed suggest that consumption of fish eggs would not affect recruitment. However, there is not a uniform methodology in the literature that allows for standardized... |
| Tipo: Journal Contribution |
Palavras-chave: Artificial feeding; Recruitment; Fish eggs; Controlled conditions; Zooplankton. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5485 |
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| Giberto, D.A.; Bremec, C.S.; Schejter, L.; Escolar, M.; Souto, V.; Schiariti, A.; Romero, M.V.; Dos Santos, E.P.. |
| The pacific oyster Crassostrea gigas, one of the most successful invasive species worldwide, inhabits intertidal and shallow subtidal marine and mixohaline coastal waters. In Argentina the species colonized natural ecosystems of southern Buenos Aires and northern Patagonia. However, in the last years the presence of oysters in the coast of Punta Rasa, northern Buenos Aires, was reported. Therefore, with the aim of recognizing the identity of the species, an exploratory survey in the salt marshes close to San Clemente stream was carried out. Individuals were identified as C. gigas (shell height up to 37 mm, density up to ~390 ind. m-2). Oysters were found clumped in small reefs in muddy substrates mixed with shell debris, attached to the stems of Spartina... |
| Tipo: Journal Contribution |
Palavras-chave: Benthos Introduced species Coastal zone Environmental impact Environmental surveys Aquaculture Crassostrea gigas Spartina alterniflora PSW; Argentina; Buenos Aires; Samborombon Bay brackishwater environment marine environment. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4909 |
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