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Seasonal variability of planktonic copepods (Copepoda: Crustacea) in a tropical estuarine region in Brazil
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Seasonal variability of planktonic copepods (Copepoda: Crustacea) in a tropical estuarine region in Brazil
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Seasonal variability of planktonic copepods (Copepoda: Crustacea) in a tropical estuarine region in Brazil
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Journal Article
Seasonal variability of planktonic copepods (Copepoda: Crustacea) in a tropical estuarine region in Brazil
2009
Overview
The Caravelas River estuary and adjacent coastal region were studied during the rainy and dry seasons of 2003-2004 to assess the copepod community structure. Abiotic and biotic parameters were measured, and the total density, frequency and percentage of copepod taxa were determined for each sampling period. Copepod densities showed significant differences between sampling periods, with higher densities in the rainy seasons (Mean: 90,941.80 ind.m-3; S.D.: 26,364.79). The sampling stations located to the north and south, in the coastal region adjacent to the Caravelas River estuary presented the lowest copepod density values. The copepod assemblage was composed mainly of estuarine and estuarine/coastal copepods. The seasonal variations in temperature and salinity influenced the abundance of species during the rainy and dry seasons, with the following dominant species alternating: Paracalanus quasimodo Bowman, 1971 in the rainy season of 2003, Parvocalanus crassirostris Dahl, 1894 in the dry season of 2003 and Acartia lilljeborgii Giesbrecht, 1892 in the rainy and dry seasons of 2004. Non-parametric multidimensional scaling indicated differences in copepod assemblages between sampling periods, but not between sampling stations.
