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首页> 外文期刊>Estuarine Coastal and Shelf Science >Intertidal biofilm distribution underpins differential tide-following behavior of two sandpiper species (Calidris mauri and Calidris alpina) during northward migration
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Intertidal biofilm distribution underpins differential tide-following behavior of two sandpiper species (Calidris mauri and Calidris alpina) during northward migration

机译：潮间生物膜分布加强了北迁徙期间两种矶pi（Calidris mauri和Calidris alpina）的潮汐跟随行为

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The discovery that some shorebird species graze heavily on biofilm adds importance to elucidating coastal processes controlling biofilm, as well as impetus to better understand patterns of shorebird use of intertidal flats. Western sandpipers (Calidris mauri) and dunlin (Calidris alpine) stopover in the hundreds of thousands on the Fraser River estuary, British Columbia, Canada, during northward migration to breeding areas. Western sandpipers show greater modification of tongue and bill morphology for biofilm feeding than dunlin, and their diet includes more biofilm. Therefore, we hypothesized that these congeners differentially use the intertidal area. A tide following index (TFI) was used to describe their distributions in the upper intertidal during ebbing tides. Also, we assessed sediment grain size, biofilm (= microphytobenthic or MPB) biomass and invertebrate abundance. Foraging dunlin closely followed the ebbing tide line, exploiting the upper intertidal only as the tide retreated through this area. In contrast, western sandpipers were less prone to follow the tide, and spent more time in the upper intertidal. Microphytobenthic biomass and sediment water content were highest in the upper intertidal, indicating greater biofilm availability for shorebirds in the first 350 m from shore. Invertebrate density did not differ between sections of the upper intertidal. Overall, western sandpiper behaviour and distribution more closely matched MPB biofilm availability than invertebrate availability. Conservation of sandpipers should consider physical processes, such as tides and currents, which maintain the availability of biofilm, a critical food source during global migration. (C) 2015 Elsevier Ltd. All rights reserved.
机译：一些shore鸟物种在生物膜上大量放牧的发现增加了阐明控制生物膜的沿海过程的重要性，并推动了人们更好地了解使用潮间带滩涂的s鸟的模式。在向北向繁殖地区迁移的过程中，加拿大不列颠哥伦比亚省弗雷泽河河口的成千上万的西方sand（Calidris mauri）和dunlin（Calidris alpine）中途停留。西部sand表现出比邓林更大的舌头和舌头形态变化，以生物膜为食，它们的饮食中包含更多的生物膜。因此，我们假设这些同类物以不同的方式使用潮间带。潮汐跟踪指数（TFI）用于描述潮汐退潮期间它们在上潮间带的分布。此外，我们评估了沉积物的颗粒大小，生物膜（=微植物底栖动物或MPB）生物量和无脊椎动物的丰度。觅食都林紧紧跟随潮汐线，仅在潮汐退潮时才利用潮间带。相比之下，西部sand更不容易跟上潮流，而在潮间带上花费更多的时间。潮间带上层微生物的底栖生物量和沉积物水分含量最高，表明在离岸的前350 m内，水鸟的生物被膜利用率更高。上部潮间带的无脊椎动物密度没有差异。总体而言，西部sand的行为和分布比无脊椎动物的可用性更接近MPB生物膜的可用性。 sand的养护应考虑潮汐和洋流等物理过程，这些过程可保持生物膜的可利用性，而生物膜是全球迁移过程中的重要食物来源。 （C）2015 Elsevier Ltd.保留所有权利。

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