Volumen 46 - Número 1: 17-25 | 2011
Article

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Composition and spatial distribution of the benthic macrofauna in the Cachoeira River estuary, Ilhéus, Bahia, Brazil

Thailla M. Ourives¹, Alexandra E. Rizzo² and Guisla Boehs^1*

¹Universidade Estadual de Santa Cruz (UESC), Departamento de Ciências Biológicas, Programa de Pós-Graduação em Sistemas Aquáticos Tropicais, Rodovia Ilhéus-Itabuna, km 16, 45650-900 Ilhéus, Bahia, Brasil

²Universidade do Estado do Rio de Janeiro (UERJ), IBRAG, Departamento de Zoologia, Rua São Francisco Xavier, 524, Maracanã, 20.550-013, Rio de Janeiro, Brasil

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We analyzed the composition and spatial distribution of macrobenthos in the Cachoeira River estuary, Ilhéus, Bahia, Brazil. Samples were taken bimonthly from July 2008 to May 2009 at six stations along the estuary. In total, 613 individuals belonging to 71 taxa were collected. Molluscs showed the highest richness and abundance, followed by polychaetes. The spatial distribution of macrobenthos was influenced by salinity and by sediment characteristics. In the outer area microgastropods, the bivalve Donax gemmula, and the polychaete Drilonereis sp., were conspicuous. In the river mouth, the carnivorous gastropods Olivella minuta and Anachis obesa and the algal grazers Neritina virginea and Littorina ziczac predominated. In the middle estuary, there was a predominance of the polychaete Hemipodia californiensis. The euryhaline bivalves Tellina sp., Anomalocardia brasiliana, and Tagelus plebeius and the deposit-feeding polychaetes Heteromastus filiformis and Capitella cf. capitata were predominant in the inner estuary. Salinity, sediment characteristics, and dietary habits were important in the composition and distribution of organisms in this estuary.

Key words: Benthos, ecology, Brazilian northeast

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