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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Temporal variation in richness and composition of recruits in a diverse cnidarian assemblage of subtropical Brazil
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Temporal variation in richness and composition of recruits in a diverse cnidarian assemblage of subtropical Brazil

机译：亚热带巴西不同CNIDIAN组合中新兵的丰富度和组成的时间变化

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Many studies have shown that the processes of colonization of new marine substrata, from settlement to recruitment, can leave long and lasting signals on the richness, composition and general structure of natural epifaunal assemblages. Systematic descriptions of temporal variability in patterns of richness and structure of recruits are scarce, partly because of logistical difficulties of working with multispecies assemblages of recruits. Here we quantify temporal variation in recruit richness, composition and structure of a rich cnidarian assemblage in southeastern Brazil, and evaluate the effect of microhabitat type and time of submersion on these patterns. We conclude that hydrozoan (the prevailing cnidarians in this assemblage) species richness occurs in a temporally bimodal pattern, with the majority of species divided between year-round recruiting species and temporally infrequently, non-seasonal species. This pattern does not depend on the species local abundance, and suggests that local species richness may be better estimated by increasing sampling efforts over time. Moreover, time since substrate submersion had no effect on species richness, but influences species composition, suggesting constant changes in the assemblage instead of accumulation of species through time. Finally, microhabitat variation, measured as differences between sheltered and exposed surfaces, despite influencing species' abundances, was not important for species richness.
机译：许多研究表明，从定居到征募，新的海洋底层的定殖过程可以对天然表生动物群的丰富性，组成和总体结构发出长期持久的信号。对新兵的丰富程度和结构的时间变化的系统描述很少，部分原因是与新兵种的后勤工作困难。在这里，我们量化了巴西东南部新兵的丰富集会，组成和结构的时间变化，并评估了微生境类型和浸没时间对这些模式的影响。我们得出的结论是，水生动物（该种群中的主要刺胞动物）物种丰富性以时间双峰模式发生，大多数物种在全年的募集物种和时间上很少的非季节性物种之间划分。这种模式不取决于物种的局部丰度，并且表明随着时间的推移，增加采样工作可能会更好地估计局部物种的丰富度。而且，自底物浸入以来的时间对物种丰富度没有影响，但会影响物种组成，表明组合不断变化，而不是物种随时间积累。最后，尽管影响物种丰富度，但以栖息地和裸露表面之间的差异衡量的微生境变化对物种丰富度并不重要。

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