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首页> 外文期刊>Marine ecology progress series >Free-living marine nematodes actively choose habitat when descending from the water column
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Free-living marine nematodes actively choose habitat when descending from the water column

机译：自由生活的线虫从水柱下降时积极选择栖息地

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摘要

Benthic organisms living in shallow high-energy areas are regularly suspended into the water column, where they dwell for longer or shorter periods before they re-enter the benthos. Marine free-living nematodes, normally the most abundant metazoans in soft sediments, lack a pelagic larval stage and are exceedingly poor swimmers. Although empirical data are lacking, nematodes are regularly considered to settle as passive particles through the water column. We carried out an experiment to assess whether nematodes are able to choose settling spots when descending from the water column. In the laboratory, nematodes were extracted from sediment collected from a shallow sandy bay and allowed to settle in a water column of 1 m to the bottom, which was seeded with 4 small containers containing: nothing, sediment without organic matter, sediment with added pelagic algae and sediment with added benthic algae (BA). The nematodes showed a clear preference for the BA containers, being about 7 times as abundant there than in the other treatments (p < 0.001). The nematode composition was different among treatments with 3 abundant species more or less confined to BA. The size distribution of the nematodes shows that the smallest nematodes are also the most efficient in choosing habitat. This is in concordance with the prediction that swimming ability is coupled to nematode size and water viscosity. The results obtained show that the conception of nematodes as passive particles in the water column is not entirely valid.
机译：生活在浅高能区的底栖生物通常会悬浮在水柱中，在重新进入底栖生物之前，它们会在水中停留更长或更短的时间。海洋自由生活的线虫通常是软沉积物中最丰富的后生动物，没有上层幼体阶段，而且是极其贫穷的游泳者。尽管缺乏经验数据，但线虫通常被认为是通过水柱沉淀的被动颗粒。我们进行了一项实验，以评估线虫从水柱下降时是否能够选择沉降点。在实验室中，从浅沙湾收集的沉积物中提取线虫，并使其沉入底部1 m的水柱中，并用4个小容器播种，其中装有：无，没有有机物的沉积物，带中上层沉积物的沉积物藻类和沉积物以及底栖藻类（BA）。线虫对BA容器表现出明显的偏爱，那里的线虫数量是其他处理方法的7倍（p <0.001）。在3种或多或少限于BA的丰富物种的处理之间，线虫的组成是不同的。线虫的大小分布表明，最小的线虫在选择栖息地方面也是最有效的。这与游泳能力与线虫大小和水粘度有关的预测是一致的。获得的结果表明，线虫在水柱中作为被动颗粒的概念并不完全有效。

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