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首页> 外文期刊>Marine biology >Impact of Arenicola marina (Polychaeta) on the microbial assemblages and meiobenthos in a marine intertidal flat
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Impact of Arenicola marina (Polychaeta) on the microbial assemblages and meiobenthos in a marine intertidal flat

机译：滨海槟榔（Arenicola marina）（Polychaeta）对海洋潮间带微生物群落和中间底栖动物的影响

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The benthic microbial food web can be responsible for a large proportion of benthic carbon cycling yet there are few data on the trophic interactions between this food web and macrobenthos. A large-scale field experiment was conducted to investigate effects of eliminating the polychaete Arenicola marina on benthic microbes (pro-karyotes, heterotrophic and autotrophic protists) and meta-zoan meiofauna in a marine intertidal flat of the North Sea, Germany. Over a period of 2 years, quantity and composition of micro- and meiobenthos from unmanipulated sitesrnwere compared to those from sites deplete of lugworms. These grazer treatments were cross-classified with different sediment characteristics (low- and mid-intertidal areas). Lugworm removal resulted in an initial increase in abundance of prokaryotes and nanoflagellates, which became less pronounced in the second year. Ciliates were not affected quantitatively, but in the absence of lugworms, diversity and the proportion of carnivorous forms increased. Meiobenthos (nematodes, ostracods and cope-pods) were affected only moderately. The observed changes are probably due to a combination of release from grazing/ predation pressure, changes in the species composition of higher trophic levels (namely large polychaetes) and altered environmental conditions (such as depth of the oxygenated layer and sediment grain size). Spatial differences between sites of different tidal exposure/grain size appeared to be as large as temporal differences during the 2 years following the manipulation of the system. We conclude that in intertidal sediments, indirect effects due to habitat transformation are as important as direct biological interactions (grazing pressure and competition) for the dynamics of the benthic microbial food web.
机译：底栖微生物食物网可能是底栖生物碳循环的主要部分，但有关该食物网与大底栖生物之间营养相互作用的数据很少。进行了一项大规模的野外实验，研究了消除多毛动物Arenicola码头对德国北海海洋潮间带底栖微生物（原核生物，异养和自养生物）和后生动物动物的影响。在2年的时间里，与未得sites虫的地方相比，未操纵地点的微和鱼底栖动物的数量和组成得到了比较。这些食草动物的处理方法根据不同的沉积物特征（潮间带中低潮区）进行了交叉分类。去除夜蛾后，原核生物和纳米鞭毛虫的丰度开始增加，在第二年变得不那么明显。纤毛虫没有受到定量的影响，但是在没有lu虫的情况下，多样性和肉食形式的比例增加了。 Meiobenthos（线虫，ostracods和cope-pod）仅受到中度影响。观测到的变化可能是由于放牧/捕食压力的释放，较高营养级物种组成的变化（即大型多毛鱼类）和环境条件的变化（例如氧化层的深度和沉积物粒度）的综合作用。在操纵该系统后的两年中，潮汐暴露/颗粒大小不同的站点之间的空间差异似乎与时间差异一样大。我们得出结论，在潮间带沉积物中，由于生境转化而产生的间接影响与直接生物相互作用（放牧压力和竞争）对于底栖微生物食物网的动力学同等重要。

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  • 来源
    《Marine biology》 |2010年第6期|1271-1282|共12页
  • 作者

    Yanli Lei; Karen Stumm; Nils Volkenborn; Stephen A. Wickham; Ulrike-G. Berninger;

  • 作者单位

    Department of Organismic Biology, University of Salzburg,Hellbrunner Str. 34, 5020 Salzburg, Austria Institute of Oceanology, Chinese Academy of Sciences,266071 Qingdao, People's Republic of China;

    Alfred Wegener Institute for Polar and Marine Research,Am Handelshafen 12, 27570 Bremerhaven, Germany Department of Microbiology and Bioprocess Technology,University of Leipzig, Johannisallee 21-23,04103 Leipzig, Germany;

    Alfred Wegener Institute for Polar and Marine Research,Wadden Sea Station Sylt, Hafenstrasse 43, 25992 List, Germany Department of Biological Sciences, University of South Carolina,Columbia, SC 29208, USA;

    Department of Organismic Biology, University of Salzburg,Hellbrunner Str. 34, 5020 Salzburg, Austria;

    Department of Organismic Biology, University of Salzburg,Hellbrunner Str. 34, 5020 Salzburg, Austria;

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