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首页> 外文期刊>Estuarine Coastal and Shelf Science >Top-down control of mesozooplankton by adult Mnemiopsis leidyi influences microplankton abundance and composition enhancing prey conditions for larval ctenophores
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Top-down control of mesozooplankton by adult Mnemiopsis leidyi influences microplankton abundance and composition enhancing prey conditions for larval ctenophores

机译：成年的Mnemiopsis leidyi自上而下地控制中层浮游动物影响了微浮游生物的丰度，并增加了组成，从而增强了幼体尾鳍的捕食条件。

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The ctenophore Mnemiopsis leidyi is a gelatinous predator capable of exerting strong regulatory control on the zooplankton community. Mnemiopsis populations are comprised of lobate adults and cydippid larvae. Since the larvae depend on microplankton for prey, its availability may determine the magnitude of larval survivorship and growth, and their subsequent recruitment into mesozooplankton-feeding adults. Ctenophore population data were used alongside mesozooplankton and microplankton abundances to interpret predatory impacts of M. leidyi in a Long Island, New York estuary over two years. Field data suggested significant top-down control of mesozooplankton and microplankton during peak abundances of adult and larval ctenophores, respectively. Abundances of dinoflagellates and ciliates declined by 45-56% and 83-97%, respectively, during highest larval abundances in 2008 and 2009. Furthermore, the dramatic reduction of mesozooplankton by adult M. leidyi resulted in a cascading effect on microplankton. A relationship between high adult M. leidyi/low mesozooplankton with high microplankton abundances was identified, and preceded an increase in ctenophore larvae. These data suggest that blooms of M. leidyi result in a direct feedback system, wherein intense feeding activity by adults on mesozooplankton releases certain microplanktonic taxa from predation pressure, enhancing prey conditions for larval ctenophores.
机译：Ctenophore Mnemiopsis leidyi是一种凝胶状的捕食者，能够对浮游动物群落施加强大的调控作用。 Mnemiopsis种群由成叶的成虫和蛛形幼虫组成。由于幼体依靠微浮游生物捕食，因此其可利用性可能决定幼体存活和生长的程度，以及随后将它们招募给以中微浮游动物为食的成年动物。 Ctenophore人口数据与中小浮游生物和微浮游生物的丰度一起用于解释两年来在纽约长岛河上的莱迪支原体的掠食性影响。现场数据表明，在成年和幼体尾足动物的峰值丰度期间，对中层浮游动物和微浮游生物的有效的自上而下的控制。在2008年和2009年的最高幼虫丰度期间，鞭毛藻和纤毛虫的丰度分别下降了45-56％和83-97％。成年M. leidyi成年中生浮游动物的大量减少导致了对微浮游生物的级联效应。鉴定了成年高水平的雷德氏梭鱼/中游浮游动物低与浮游生物丰富的高之间的关系，并在c鳍幼虫增加之前。这些数据表明，雷迪氏菌的开花导致直接反馈系统，其中成年动物在中层浮游动物上的强烈觅食活动从掠食压力中释放出某些微浮游类群，从而增强了幼体尾鳍的捕食条件。

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