Marine species can act as biogenic sources of habitat structures, increasing the web of interactions between reef fishes and the benthic environment. Among these species, sea urchins seem to play an ecological role that goes beyond the dynamics of coral-algal interaction on reef ecosystems. In this paper, we describe the commensal behavior of juveniles of two non-cryptobenthic reef fishes (Haemulon parra and Abudefduf saxatilis) with the sea urchin Diadema antillarum on sandstone reefs in Northeastern Brazil. Behavioral observations in situ raise the assumption that D. antillarum may provide an alternative source of shelter and therefore influence microhabitat complexity, particularly, for juvenile reef fishes.

中文翻译：

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使用海胆Diadima antillarum（Echinodermata，Echinoidea）作为非隐生的幼礁鱼的庇护所

海洋物种可以作为栖息地结构的生物来源，从而增加珊瑚礁鱼类与底栖环境之间相互作用的网络。在这些物种中，海胆似乎起着生态作用，其作用超出了珊瑚与藻类在珊瑚礁生态系统中相互作用的动态范围。在本文中，我们描述了两种非隐性珊瑚礁鱼类（Haemulon parra和Abudefduf saxatilis）与海胆Diadema antillarum在巴西东北部砂岩上的共生行为。原地的行为观察提出了这样的假设，即香菇D.antillarum可能提供了另一种庇护所，因此影响了微生境的复杂性，特别是对于幼礁鱼。