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首页> 外文期刊>Marine ecology progress series >Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia
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Fine-scale vertical distributions of Mnemiopsis leidyi ctenophores: predation on copepods relative to stratification and hypoxia

机译：细纹夜蛾的细尺度垂直分布：捕食to足类动物相对于分层和缺氧

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摘要

Plankton concentrations near discontinuities in the water column (clines) are believed to be important for intensifying trophic interactions; however, evidence for increased feeding by predators at clines in situ is scarce. Here we demonstrate enhanced feeding near pycno-clines by a voracious planktivore, the ctenophore Mnemiopsis leidyi. To determine their feeding relative to stratification, we quantified temperature, salinity, dissolved oxygen concentration (DO), densities of ctenophores and copepods at 1 to 2 m depth intervals, and gut contents of ctenophores collected by depth layer at stations in a tributary and in the mainstem Chesapeake Bay during summer from 1999 to 2001. We tested the null hypotheses that patterns in the tributary and the bay were similar and that ctenophore vertical distributions and feeding were independent of the vertical distributions of the physical variables, stratification, and copepods. We rejected all null hypotheses. Ctenophores and copepods had peak densities below the pycnocline in the weakly stratified tributary, where DO was above 2 mg l~(-1) throughout the water column; by contrast, they were more concentrated above the strong pycnocline and near-anoxic waters at ～ 11 m in the bay. Predation on copepods by ctenophores was highest where both populations were concentrated. Our results illustrate the importance of stratification to planktonic trophic interactions for M. leidyi, which thrives in anthropogenically degraded waters and now is established throughout European seas, where it can negatively affect planktonic food webs and fisheries.
机译：人们认为水柱（直线）间断面附近的浮游生物浓度对于加强营养相互作用很重要。然而，缺乏证据表明捕食者在原产地的捕食量增加。在这里，我们证明了一个贪婪的浮游生物，即ten虫Mnemiopsis leidyi，增强了在比诺氏系附近的觅食。为了确定它们相对于分层的进食，我们量化了温度，盐度，溶解氧浓度（DO），eno足类和co足类动物在1至2 m深度间隔处的密度，以及在支流和支流站中按深度层收集的ct足类动物的肠道含量。在1999年至2001年夏季期间，它是切萨皮克湾的主要干系。我们检验了零假设，即支流和海湾的格局相似，c鳍垂直分布和觅食独立于物理变量，分层和co足类动物的垂直分布。我们拒绝了所有零假设。在弱分层的支流中，ten虫和co足类动物的峰值密度低于比可可林，在整个水柱中DO均高于2 mg l〜（-1）；相比之下，它们更集中在海湾中约11 m的强比可可林和近缺氧水域上方。 both足类对concentrated足类的捕食率最高，这两个种群都集中。我们的研究结果表明，分层对莱迪分枝藻的浮游性营养相互作用非常重要，该物种在人为降解的水域中繁衍生息，现已在整个欧洲海域建立，对浮游性食物网和渔业具有负面影响。

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  • 来源
    《Marine ecology progress series》 |2014年第17期|103-120|共18页
  • 作者

    Jennifer E. Purcell; Mary Beth Decker; Denise L. Breitburg; Katherine J. Broughton;

  • 作者单位

    University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, Maryland 21613, USA,Shannon Point Marine Center, 1900 Shannon Point Road, Anacortes, Washington 98221, USA;

    University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, Maryland 21613, USA,Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06520-8106, USA;

    The Academy of Natural Sciences, Estuarine Research Center, 10545 Mackall Rd, St. Leonard, Maryland 20685, USA,Smithsonian Environmental Research Center, PO Box 28, Edgewater, Maryland 21037, USA;

    University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, Maryland 21613, USA,NOAA NOS/ONMS, Technical Programs & Support Division, Silver Spring, Maryland 20910, USA;

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  • 正文语种 eng
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  • 关键词

    Jellyfish; Aggregation; Cline; Acartia; Zooplankton; Low dissolved oxygen; Feeding; Clearance; Chesapeake Bay (USA);

    机译：海蜇;聚合;克莱因;虫;浮游动物;低溶解氧;馈送;间隙;切萨皮克湾（美国）;

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