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Spatial Distribution of Molluscs on Sandy Intertidal Substrates with Rock Fragments in South-Eastern Brazil

2001; Elsevier BV; Volume: 53; Issue: 5 Linguagem: Inglês

10.1006/ecss.2001.0817

1096-0015

Márcia Regina Denadai, A. Cecília Z. Amaral, Alexander Turra,

Coastal and Marine Management

Species richness, abundance, and spatial distribution of the molluscan macrofauna were studied in two intertidal environments of São Sebastião Channel, on the northern coast of São Paulo State, Brazil. The study sites, located in São Francisco and Engenho d'Água beaches, were sandy substrates with rock fragments. Samples were taken in defined intertidal areas divided into three levels (lower, middle, and upper). Thirty-six 0·16 m2samples were collected in each level. Richness was higher at Engenho d'Água (35 species) than at São Francisco (20 species). In São Francisco, more species and individuals were found at the lower level. The higher homogeneity in species distribution over the entire studied intertidal area in Engenho d'Água than in São Francisco was probably associated with the lower slope of the former one. This shows that the occurrence and distribution of molluscs were strongly related to tidal exposure. The organic pollution in São Francisco also influenced the molluscan assemblage, reducing richness and diversity.