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Environmental effects on the structure of polychaete feeding guilds on the beaches of Sepetiba Bay, south-eastern Brazil

Published online by Cambridge University Press:  14 June 2012

Gustavo Mattos*
Affiliation:
Laboratório de Ecologia Marinha, Departamento de Ecologia e Recursos Marinhos, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Rio de Janeiro, CEP 22290-240, Brazil Programa de Pós-Graduação em Ecologia, Departamento de Ecologia, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, CEP 21949-900, Brazil
Ricardo S. Cardoso
Affiliation:
Laboratório de Ecologia Marinha, Departamento de Ecologia e Recursos Marinhos, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Rio de Janeiro, CEP 22290-240, Brazil
André Souza Dos Santos
Affiliation:
Laboratório de Invertebrados Paulo Young, Departamento de Sistemática e Ecologia, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba Campus I, CEP 58059-900, João Pessoa, Paraíba, Brazil
*
Correspondence should be addressed to: G. Mattos, Laboratório de Ecologia Marinha, Departamento de Ecologia e Recursos Marinhos, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Rio de Janeiro, CEP 22290-240, Brazil email: gustavo.mattos@globo.com

Abstract

Several studies have been conducted to explain patterns of the abundance, richness and diversity of sandy-beach macrofauna; however, such analyses have ignored the overall functional structure of macrofauna communities. Few studies have examined polychaete feeding guilds on sandy beach environments. To examine the effects of environmental factors on polychaete feeding guilds on sandy beaches, 12 sandy beaches from five islands in Sepetiba Bay were sampled. A total of 24 polychaete morphospecies, grouped among 21 families, were identified in these sandy beaches. The polychaete species were classified into 10 feeding guilds, and the SDT guild (suspended-deposit feeders, discretely motile, with tentacles) was the most abundant feeding guild, with 34.2% of total number of organisms. The highest trophic importance index and index of trophic diversity values were recorded on the sheltered beaches. A canonical correspondence analysis showed that the exposure rate, beach length, and grain size of the beach sediment significantly affected the polychaete feeding guild distribution and abundance. We can conclude that sheltered beaches have a higher diversity of feeding guilds than exposed beaches and that the biological descriptors of the feeding guilds are directly associated with the grain size of the sediment.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012 

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