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Molecular analysis of amphipods in the diets of migrating shorebirds

机译:片脚类的分子分析的饮食迁徙海鸟

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Each spring great numbers of shorebirds gather in Delaware Bay, USA during the reproductive season of Horseshoe Crabs Limulus polyphemus to capitalize on crab eggs. Due to overharvesting, the abundance of both crabs and their eggs has significantly declined in the last two decades, and little is known about alternative food types. We examined potential consumption of amphipods by Dunlins Calidris alpina, Semipalmated Sandpipers C. pasilla, Least Sandpipers C. minutilla and Short-billed Dowitchers Limnodromus griseus during spring migration through Delaware Bay, by amplification of prey DNA fragments in feces with amphipod-specific primers. Our analysis shows that amphipods contributed to the diet of shorebirds and we found significant differences in utilization of these crustaceans among species. Over 80% of Least Sandpipers tested positive for amphipod DNA, implying that these birds may rely heavily on amphipods, and possibly other benthic invertebrates, rather than Horseshoe Crab eggs. A considerable proportion of Semipalmated Sandpipers and Short-billed Dowitchers consumed amphipods as well. Together with previously documented use of tidal mudflats and marshes by shorebirds in Delaware Bay, this may suggest new conservation strategies regarding these habitats.
机译:每年春天大量的滨鸟聚集在美国特拉华湾在生殖季节的鲎鲎波吕斐摩斯利用蟹蛋。丰富的螃蟹和它们的卵在过去二十年里,明显下降和对其它食物类型。我们检查了潜在的消费端黑腹滨鹬Calidris阿尔,Semipalmated鹬c . pasilla鹬c . minutilla和最小Short-billed Dowitchers Limnodromus将在春季迁徙到特拉华湾,猎物在粪便DNA片段的扩增amphipod-specific引物。这片导致的饮食水鸟和我们发现显著差异在利用这些甲壳类动物物种。片脚类动物DNA阳性,这意味着这些鸟类可能严重依赖片,和可能其他底栖无脊椎动物,而不是马蹄蟹蛋。Semipalmated鹬和Short-billedDowitchers消费端。与之前记录潮汐滩涂的使用和湿地水鸟在特拉华湾,这可能会提出新的保护策略有关这些栖息地。

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