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Composição de gastrópodes terrestres em duas áreas do Centro de Estudos Ambientais e Desenvolvimento Sustentado (CEADS), Vila Dois Rios, Ilha Grande, Rio de Janeiro, Brasil: um estudo-piloto Composition of terrestrial gastropods in two areas of the Center to Environmental Studies and Sustainable Development (CEADS), Vila Dois Rios, Ilha Grande, Angra dos Reis, Rio de Janeiro, Brazil: a preliminary study

By Sonia Barbosa dos Santos and Daniele Pedrosa Monteiro

Abstract

<abstract language="eng">A survey of the Ilha Grande land snails was carried out in order to compare the diversity and similarity among two regions of secondary Atlantic Rain Forest. The diversity was estimated using the richness and the equitatibility; the alpha diversity was calculated using the Simpson index (&#947;). The Sörensen and Jaccard indexes were used to calculate the similarity. A quantitative survey of two 600 m² area, one in each studied region, recorded 336 individuals snails distributed in 23 species and 13 families. The region with more altered secondary forest showed higher richness (17) and diversity (&#947; = 3,6) than the region more preserved (richness = 14; &#947; = 2,78), but, the same equitatibility (0,20). The similarity was medium by Jaccard index (IJ = 0,52) and low by Sorensen index (IS = 0,15). These differences could be explained by the dominance of Subulinidae (four species and 117 specimens) in the more altered region and Systrophiidae in the more preserved (four species and 97 specimens)

Topics: Terrestrial gastropods, diversity, ecology, Rio de Janeiro, Brazil, Zoology, QL1-991, Science, Q, DOAJ:Zoology, DOAJ:Biology, DOAJ:Biology and Life Sciences
Publisher: Sociedade Brasileira de Zoologia
Year: 2001
DOI identifier: 10.1590/S0101-81752001000500014
OAI identifier: oai:doaj.org/article:3d472e6ca25846a8a73bd736f04f12a5
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