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JPR Advance Access published online on July 1, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh119
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Received April 7, 2004
Accepted June 15, 2004

Article

The flood-tide ichthyoplanktonic community at the entrance into a Brazilian tropical estuary

Jean-Christophe Joyeux 1*, Bruno Bicalho Pereira 1, Hilton Gomes de Almeida 1

1 Departamento de Ecologia e Recursos Naturais, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, S/N, Goiabeiras, 29060-900, Vitória, ES, Brasil

* To whom correspondence should be addressed. E-mail: joyeux{at}npd.ufes.br.


  Abstract

The ichthyoplanktonic community of the smallest inlet into a two-entrance Brazilian estuary was studied monthly between January and December 1999. Six samples were collected during the 2 central hours of each night flood tide. The community was dominated by Engraulidae, various species of Gobiidae, mainly Microgobius meeki, and Gerreidae as a distant third. Non-resident species showed low abundance. Seasonality was well marked, with highest abundance, lowest diversity and equitability between February and April, albeit individual taxa displayed large differences among themselves. Variations in the structure and abundance of the community did not present any obvious correlation with freshwater input, salinity or water temperature, features that appear similar to that detected in the single other South-American tropical estuary similarly studied. At the continental scale, the communities of these two estuaries neatly differ from that of Amazonian river-dominated estuaries and of wind-driven sub-tropical or temperate lagoonal systems. In both, the community is numerically dominated by estuarine-dependent taxa, among which numerous Sciaenidae, and seasonal variations appear regulated by climatic conditions, either rainfall or temperature.


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