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Community structure and functional traits of mollusks associated with coastal reef macroalgae in Northeastern Brazil

机译：与巴西东北部沿海珊瑚礁大型藻类有关的软体动物的群落结构和功能特征

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摘要

This study investigated the community structure and functional traits of the mollusk fauna associated with macroalgae with different thallus morphologies in a reef environment in Northeastern Brazil. A total of 15 individuals of each species of macroalgae adhered to natural substrate and 15 individuals of Padina gymnospora detached from the substrate were collected. The structural complexity of algal habitats was measured and the associated malacofauna screened and identified. All three macroalgae differed significantly in the complexity of their habitat, with Sargassum polyceratium being the most complex. A total of 823 specimens of mollusks belonging to 22 species and 11 families were recorded, of which Columbellidae was the most represented with six species. The functional trait "size" revealed that micromollusks smaller than 10 millimeters were predominant in the community; however, individuals of larger sizes (up to 24.54 millimeters) belonging to young stages of other species were also present. Eight functional trophic groups were identified, of which "carnivorous" stood out with seven species. Six functional groups of microhabitats were identified, with intra-specific variation in habitats, while habitat expansion was documented for species not yet recorded in association with macroalgae. The structure of the molluskan community differed among the three algae species with the greatest richness, abundance, and diversity of mollusks and functional traits occurring with S. polyceratium. Community structure differed between algae adhered to natural substrate and detached algae, with the latter having lower mollusk richness and diversity, but with greater abundance of some species that remained on algal fronds after release from the reef environment. This study reinforces the importance of algal habitat for marine invertebrate fauna, especially for micromollusks that spend their entire life cycle, or part of it, in association with macroalgae.
机译：本研究调查了巴西东北部珊瑚礁环境中与不同藻类形态的大型藻类相关的软体动物的群落结构和功能特征。每个种类的大型藻类总共有15个个体粘附到天然基质上，并且从该基质上分离了15个Padina Gymnospora个体。测量了藻类栖息地的结构复杂性，并筛选和鉴定了相关的疟疾动物。这三种大型藻类在其栖息地的复杂性上都存在显着差异，其中Sargassum polyceratium是最复杂的。总共记录了823个软体动物标本，分别属于22个物种和11个科，其中Co类是最常见的六个物种。功能性状“大小”表明，小于10毫米的小分子在该社区中占主导地位。然而，也存在属于其他物种的幼龄阶段的较大个体（最大24.54毫米）。确定了八个功能性营养组，其中“食肉”与七个物种脱颖而出。确定了六个微生境功能组，其生境具有种内差异，而据记录尚未记录到与大型藻类相关的物种的生境扩展。软体动物群落的结构在三种藻类中有所不同，这三种藻类的丰富度，丰度和多样性最大，且与多角藻产生的软体动物和功能性状有关。附着在天然基质上的藻类和分离的藻类之间的群落结构不同，后者的软体动物丰富度和多样性较低，但从礁石环境释放后留在藻类叶片上的某些物种的丰度更高。这项研究加强了藻类栖息地对于海洋无脊椎动物动物群的重要性，特别是对于那些在整个生命周期（或整个生命周期的一部分）中与大型藻类相关联的微软体动物。

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