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Spatial patterns of distribution and the influence of seasonal and abiotic factors on demersal ichthyofauna in an estuarine tropical bay
Author(s) -
da Silva D. R.,
Paranhos R.,
Vianna M.
Publication year - 2016
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13033
Subject(s) - estuary , bay , demersal fish , mangrove , abiotic component , wet season , ecology , biology , demersal zone , dry season , ecosystem , upwelling , fishery , oceanography , pelagic zone , fishing , geology
This study focused on the influence of local‐scale environmental factors on key metrics of fish community structure and function at Guanabara Bay, an estuarine system that differs from all other south‐western Atlantic estuaries due to the influence of an annual low‐intensity upwelling event during late spring and summer, between November and March, when a warm rainy climate prevails. The spatial patterns of the bottom temperature and salinity were more heterogeneous during the rainy season than the dry season, being linked to total precipitation and seasonal oceanographic events. The study identified 130 species and 45 families, placing Guanabara Bay as one of the most species‐rich tropical estuarine ecosystems, far exceeding 22 other Brazilian estuaries. These results, in addition to characteristics such as a relatively well‐preserved mangrove forest, high productivity and favourable conditions for the growth and reproduction of estuarine species, indicate that Guanabara Bay plays a central role in supporting large populations of fishes, including commercially important species.