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Distribution and abundance of marine birds of the southeast south Brazil region Distribuicao e abundancia de aves marinhas na regiao sudeste-sul do Brasil



Distribution and abundance of marine birds of the southeast south Brazil region Distribuicao e abundancia de aves marinhas na regiao sudeste-sul do Brasil



Unknown



Seabird census to determine the presence of species, abundance, seasonality and environmental factors that determine the distribution of these species were carried out during six cruises on board of R.V. Atlantico Sul, under the REVIZEE Program and ARGO Project activities. The sampling stations were at the area between Chui (RS) and Itajai (SC) and over the continental shelf and slope, between 200 to 1500 meters deep. Continuous and instantaneous census and counting of following birds were developed and the data were analyzed using canonical correlation. Twenty four taxa were recorded during the study regarding south hemisphere migrants (from Tristan da Cunha, Patagonia, Malvinas/Falklands and Antarctic and Sub-Antarctic regions) and north hemisphere (mainly Azores Islands and United Kingdom). During the winter a higher number of species and the abundance also increase in most of species. Comparing the census techniques it was possible to determine that Thalassarche melanophris, Thalassarche chlororhynchos, Macronectes spp., Daption capense, Procellaria aequinoctialis, Procellaria conspicillata, Puffinus gravis and Oceanites oceanicus were species that characteristically follow the vessels while for Pterodroma incerta, Pachyptila belcheri and Calonectris diomedea the behavior of follow the vessel was not registered. Among environmental variables, the seasonality was the most important one when correlated with occurrence and abundance of birds. With this study it was possible to demonstrate the importance of the Southeastern Brazilian ZEE as a feeding area for several endangered species of albatrosses and petrels.

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Accession: 038152335

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