Mollusks occupy different kinds of environments, including the intertidal zone. The present study investigated the spatial distribution of mollusks on beach rocks of the intertidal zone of Pacheco Beach in the state of Ceará, Brazil. Sampling occurred from August 2006 to September 2007. Across two transects, six samples of 0.25 m2 were collected monthly in gaps of 30 m (0 m, 30 m, 60 m, 90 m, 120 m and 150 m). The mollusks were counted in field, and samples of sediment and algae were taken for further analysis. A total of 74,515 individuals were found and classified into 67 species, 52 genera and 39 families. Gastropods were predominant, corresponding to 73.1% of the species, followed by bivalves (22.4%) and chitons (4.5%). Caecum ryssotitum de Folin, 1867 was the most abundant taxon, representing 68.8% of total specimen findings. In general, species were mostly found in Middle Littoral zone (samples 60 m and 90 m), suggesting that the greater number of microenvironments available in this area may contribute to establishment and survival.
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机译：软体动物占据不同类型的环境，包括跨境区。本研究调查了巴西Cearádealce的Pacheco海滩透明区海滩岩石中软体动物的空间分布。从2006年8月到2007年8月发生的采样。在两个横断面，每月在30米的间隙中收集六个0.25平方米的样品（0米，30米，60米，90米，120米和150米）。软体动物在现场计数，沉积物和藻类样品进行进一步分析。共有74,515个个体被发现并分为67种，52个属和39个家庭。胃肠杆占主导地位，对应于73.1％的物种，其次是双抗体（22.4％）和凝结（4.5％）。 Caecum ryssotitum de folin，1867年是最丰富的分类因子，占标本总调查结果的68.8％。通常，物种大多是在中间沿粉溶区（样品60 m和90米）中发现的，这表明该地区可用的更多微环境可能有助于建立和生存。
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