The community composition of decapods associated with subtidal tropical seagrass meadows was analyzed in a pristine reef lagoon on the Mexican Caribbean coast in the summer of 1995 and winter of 1998. The macrophyte community was dominated by Thalassia testudinum followed by Syringodium filiforme, with interspersed rhyzophytic macroalgae and large patches of drift algae. In each season, 10 one-min trawls were made with an epibenthic sled (mesh aperture 1 mm) during the day and 10 during the night on each of five sites. In all, 53,211 decapods belonging to 119 species were collected. The most diverse taxa were Brachyura and Caridea, but the most abundant were Caridea and Anomura. Dominance was high, with three species (Latreutes fucorum, Cuapetes americanus, and Thor manningi) accounting for almost 50% of individuals, and 10 species accounting for nearly 90% of individuals. There was great similarity in community composition and ecological indices between seasons, but significantly more individuals and species in night versus day samples. In the 20+ years elapsed since the samples were taken, the reef lagoon has undergone substantial environmental changes due to extensive coastal development and, more recently, the decay of massive beachings of floating Sargassum macroalgae. This study constitutes a valuable baseline for future studies investigating the potential impact of these stressors on tropical seagrass-associated communities.

中文翻译：

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大型环境变化之前热带礁湖中与海草相关的十足纲甲壳类动物的多样性：一项基线研究

在1995年夏季和1998年冬季，在墨西哥加勒比海沿岸的原始礁湖中分析了与潮下带热带海草草甸相关的十足动物的群落组成。大型植物群落主要由Thalassia testudinum，随后的Syringodium Filiforme和散布的根瘤菌大型藻类组成。和大片的浮藻。在每个季节中，在五个地点中的每个地点，白天使用10个一分钟的拖网拖网（网眼孔径为1 mm），夜间使用10个一分钟的拖网网。总共收集了119个物种的53211个十足动物。种类最多的是Brachyura和Caridea，但是种类最多的是Caridea和Anomura。优势度很高，有3种（Latreutes fucorum，美洲卷柏和托尔·曼宁基（Thor manningi）约占个体的50％，而10个物种约占个体的90％。季节之间的群落组成和生态指数具有极大的相似性，但夜间和白天的样本中的个体和物种明显更多。自采样以来的20多年中，礁石泻湖由于广泛的沿海开发以及最近浮游的长尾藻大型藻滩的衰退而经历了重大的环境变化。这项研究为未来研究这些压力源对热带海草相关社区的潜在影响提供了有价值的基线。