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Variation in ghost crab trophic links on sandy beaches

机译：沙滩上的幽灵蟹营养联系的变化

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摘要

Using field surveys and stable isotope analyses of beach consumers and prey, we investigated whether the identity of dominant prey items of ghost crabs Ocypode quadrata differed across 3 barrier island beaches along the west coast of Florida, USA. Abundance of potential prey, mole crabs Emerita talpoida and coquina clams Donax variabilis, was determined from sediment cores collected from the swash zone at Anclote Key (ANC), Honeymoon Island (HI) and Cayo Costa (CC) from late April to September 2011. Concurrently, wrack-associated amphipods were gathered from supra-tidal areas, and ghost crabs were captured from these beaches. Stable isotopic signatures (δ~(13)C and δ~(15)N) of amphipods, mole crabs, coquinas and ghost crabs were identified and diets of ghost crabs compared across beaches using stable isotope analysis in R (SIAR) mixing models. Ghost crabs from CC and HI fed primarily on swash zone animals (mean contribution to diet = 67.6 and 68.4 %, respectively), while those from ANC mainly consumed wrack-associated amphipods (mean contribution = 55.7%). ANC supported a comparatively low abundance of swash prey, contained moderate amounts of fine-grain sediments and retained a high biomass of seagrass wrack. In contrast, significantly greater abundances of swash prey were found on CC than on other beaches, and a low biomass of wrack was commonly recorded. This new information suggests that wrack may serve as an important marine subsidy and underlie a dietary shift observed for ghost crab consumers on some beaches. In addition to products transported onshore, beach morphology and features of inland habitats may contribute to variability in trophic structure of these subtropical beaches.
机译：通过对海滩使用者和猎物的实地调查和稳定同位素分析，我们调查了美国佛罗里达州西海岸的3个障碍岛海滩上，鬼蟹Ocypode quadrata占优势的猎物的身份是否不同。根据从Anclote Key（ANC），蜜月岛（HI）和Cayo Costa（CC）冲积带收集的沉积物核心（2011年4月下旬至2011年9月）确定了潜在的猎物、,蟹Emerita talpoida和蛤co Donax variabilis。同时，从潮间带收集了与残骸相关的两栖动物，并从这些海滩捕获了鬼蟹。在R（SIAR）混合模型中，使用稳定同位素分析，确定了两栖动物，mole类蟹，coquinas和鬼蟹的稳定同位素特征（δ〜（13）C和δ〜（15）N），并比较了海滩上的鬼蟹饮食。来自CC和HI的鬼蟹主要以斜带动物为食（对饮食的平均贡献分别为67.6和68.4％），而来自ANC的鬼蟹主要食用与残骸相关的两栖类动物（平均贡献为55.7％）。 ANC支持相对较少的冲刷猎物，包含适量的细颗粒沉积物，并保留了高生物量的海草残骸。相反，与其他海滩相比，在CC上发现大量的冲刷猎物，并且通常记录到较低的残骸生物量。这些新信息表明，残骸可能是一项重要的海洋补贴，并且是某些海滩上幽灵蟹消费者饮食结构发生变化的原因。除了陆上运输的产品外，海滩的形态和内陆栖息地的特征也可能导致这些亚热带海滩的营养结构发生变化。

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