Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/52945
Type: Artigo de periódico
Title: A comparative study of intertidal molluscan communities in sandy beaches, Sao Sebastiao Channel, Sao Paulo State, Brazil
Author: Denadai, MR
Amaral, ACZ
Abstract: The aim of this work was to study the molluscan communities in two intertidal environments and their relationship with selected environmental variables. The study areas are located along Sao Francisco and Engenho d'Agua beaches (Sao Sebastiao Channel, Sao Paulo State, Brazil). These sites are structurally similar with sediments of coarse sand and pebbles that facilitate settlement of molluscan species. The area was subdivided into low, intermediate and high intertidal levels where the samples were taken. Temperature, salinity, grain size, organic matter, and calcium carbonate content were analyzed as environmental variables. The high species diversity recorded in the study sites was due to the occurrence of organisms on consolidated and unconsolidated substrates. However, differences in the specific composition of the two areas were associated with local differences in sediment constituents and the presence of urban waste water in Sao Francisco. In general, few species were common to both sites, with higher richness and number of individuals in Engenho d'Agua. Differences in environmental variables and in species distribution between the two areas were indicated by Canonical Correspondence Analysis, which also revealed that grain size, salinity and calcium carbonate content played a more important role in species distribution than did the organic matter content.
Country: EUA
Editor: Rosenstiel Sch Mar Atmos Sci
Rights: fechado
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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