Scientia Marina, Vol 65, No 4 (2001)

Spatial distribution of annelids in the intertidal zone in Sao Sebastiao Channel, Brazil


https://doi.org/10.3989/scimar.2001.65n4323

Alexandra E. Rizzo
Departamento de Zoologia, Instituto de Biologia, UNICAMP, Brazil

A. Cecilia Z. Amaral
Departamento de Zoologia, Instituto de Biologia, UNICAMP, Brazil

Abstract


We studied the spatial distribution of annelids in the intertidal zone of two beaches (Engenho d´Água and São Francisco) in São Sebastião Channel, southeastern Brazil, from August 1995 through July 1996. This region is commonly affected by oil spills and sewage waste. The substratum of the two beaches is composed of a mixture of sand and rock fragments. We established three levels (100 m2) in the intertidal zone of each study site: lower, intermediate, and upper. In general, species richness increased from upper towards lower levels. The distribution of species at Engenho d´Água was more homogeneous than at São Francisco. Only some individual spatial patterns were recognised at São Francisco. The most abundant polychaete species at Engenho d´Água (Nematonereis hebes, Timarete filigera, and Scyphoproctus djiboutiensis) occurred in the intermediate and lower levels. The upper level of São Francisco was characterised by a peak of opportunists, with a large number of individuals but few dominant species (Capitella sp., Scolelepis squamata, Laeonereis acuta, and the oligochaete Tubifex sp).

Keywords


spatial distribution; intertidal zone; sand with rocky fragments beach; annelids, polychaetes; São Sebastião Channel

Full Text:


PDF


Copyright (c) 2001 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Contact us scimar@icm.csic.es

Technical support soporte.tecnico.revistas@csic.es