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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Selective settlement of deep-sea canyon nematodes after resuspension :an experimental approach
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Selective settlement of deep-sea canyon nematodes after resuspension :an experimental approach

机译：重悬后深海峡谷线虫的选择性沉降：一种实验方法

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摘要

Dispersal processes are known to influence dynamics of marine benthic communities. It has been argued that as a result of nematodes being small in size and lacking pelagic larvae, it is unlikely that they are able to disperse actively over wide geographical ranges. Nematode dispersal is therefore assumed to be predominantly driven by water currents entraining resuspended sediments containing nematodes. Three different types of substrates combined with sediment (algae, bacteria, and sulphides) and two different controls (empty and azoic sediment) were offered to a nematode community sinking through the water column in three independent, simultaneously running replicated experiments. Selective settlement of nematodes was observed whilst descending in the water column under ex-situ experimental conditions using samples collected in the Whittard canyon at 812 m of water depth. Significant differences in nematode community structure between treatments suggest that different nematodes are attracted by different substrates. They may colonise suitable patches selectively when descending in the water column, but whether they are attracted by food or by other attractants, such as pheromones or other chemical signals, is still unclear. High abundances of the chemosynthetic, mouthless nematode Astomonema found in the canyon study area over medium-scale distances (10-100 m) contribute to the idea that resuspension events enable dispersal of nematodes over larger distances, after which active settlement can occur through chemical attraction.
机译：已知分散过程会影响海洋底栖生物群落的动态。有人认为，由于线虫体型小，缺乏上层幼虫，它们不可能在广泛的地理范围内活跃地散布。因此，可以认为线虫的扩散主要是由水流带动的，该水流夹带了含有线虫的重悬沉积物。在三个独立的，同时运行的重复实验中，向沉没穿过水柱的线虫群落提供了三种不同类型的底物与沉积物（藻类，细菌和硫化物）和两种不同的对照（空的和偶氮的沉积物）组合。使用在Whittard峡谷中812 m水深处收集的样品，在异位实验条件下观察到的线虫在水柱中下降时的选择性沉降。处理之间线虫群落结构的显着差异表明不同的线虫被不同的底物吸引。当它们下降到水柱中时，它们可能会选择性地定居在适当的斑块上，但是仍不清楚它们是被食物还是被其他引诱剂（如信息素或其他化学信号）所吸引。在峡谷研究区域的中等规模距离（10-100 m）上发现大量的化学合成，无口线虫线虫病，这促使人们认为重悬事件可使线虫在较大距离上扩散，此后可以通过化学吸引作用进行主动沉降。

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    Lidia Lins; Ann Vanreusel; Jelle van Campenhout; Jeroen Ingels;

  • 作者单位

    Marine Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium,Meiofauna Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235,50670-901 Cidade Universitaria, Brazil;

    Marine Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium;

    Marine Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium;

    Marine Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium,Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    deep sea; nematodes; resuspension; settlement;

    机译：深海;线虫;悬浮;沉降;

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