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This study aimed to compare the density of Isognomon bicolor on four rocky shores of the State of Espírito Santo, Brazil. Further, size and weight comparisons were undertaken for the flat and creviced surfaces. Quarterly samplings were taken in 2006 and 2007, by removing organisms from 10 x 10 cm quadrants in the mid-intertidal zone, with five samples from flat surfaces and five from crevices. Although densities of I. bicolor were considered low as compared with those of other studies, this species is well established in the State. The most well-established population of I. bicolor was found in the rock crevices. The most important factor for the establishment of I. bicolor on rocky shores is substrate heterogeneity. O objetivo deste estudo foi comparar a densidade de Isognomon bicolor em quatro costões rochosos no Espírito Santo, Brasil. Além disso, comparações do tamanho e do peso foram feitas para as superfícies lisas e com fendas. Coletas trimestrais foram realizadas entre 2006 e 2007, os organismos foram removidos utilizando um quadrado de 100 cm² na faixa do médiolitoral, sendo cinco nas superfícies lisas e cinco nas fendas. As densidades de I. bicolor foram consideradas baixas em comparação com outros estudos, mas a espécie encontra-se bem estabelecida. Foi obtido um maior número de indivíduos nas fendas. O fator mais importante para o estabelecimento de I. bicolor nos costões rochosos estudados mostrou ser a heterogeneidade do substrato

Spatial variability in the population of Isognomon bicolor (C.B. Adams, 1845) (mollusca, bivalvia) on rocky shores in Espírito Santo, Brazil