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首页> 外文期刊>Marine ecology progress series >Active colonisation of disturbed sediments by deep-sea nematodes: evidence for the patch mosaic model
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Active colonisation of disturbed sediments by deep-sea nematodes: evidence for the patch mosaic model

机译：深海线虫活跃地干扰了沉积物：斑块镶嵌模型的证据

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An on-board experiment was performed during a research cruise to investigate the ability of deep-sea nematode species to actively colonise defaunated sediments. Small cylinders of 500 μm wire mesh filled with defaunated sediment were inserted into microcosms containing sediment with indigenous meiofauna collected from 1300 m depth in the Arctic Ocean. The defaunated sediments were either enriched with the diatom Thalassiosira weissflogii, or remained unenriched. Samples from the defaunated sediment were taken after 9 and 17 d. As controls, microcosms with sediment containing the indigenous meiofauna but without an internal cylinder were also sampled at each time interval. Nematodes colonised both enriched and unenriched sediments with abundances of up to 20% of the controls. Irrespective of the time of sampling, abundance and number of species were significantly higher in the enriched treatment, suggesting that the presence of food enhances colonisation and resilience. Nematode assemblages in the defaunated sediments 'were species-rich and differed from the controls. The majority of colonising species were rare or undetectable in the controls, suggesting that episodic disturbances may be necessary for their persistence in deep sea sediments. Colonisation was in part determined by species characteristics such as size and motility. At the same time, a large number of different species colonised the empty cylinders, resulting in poor similarity in community composition between replicates, particularly between samples enriched with diatoms. Our results indicate a poor predictability of community composition of recently disturbed sediments despite highly reproducible abundance and diversity patterns and lends experimental support to the existence of a spatio-temporal mosaic that emerges from highly localised colonisation patterns.
机译：在一次研究航行中进行了一项船上实验，以研究深海线虫物种主动定殖被破坏的沉积物的能力。将500微米金属丝网的小圆柱体装满已消失的沉积物，并将其插入含有从北冰洋1300 m深度收集的原生动物动物的沉积物的缩影中。消失的沉积物要么富含硅藻Thalassiosira weissflogii，要么未被富集。在第9和17天后，从被清除的沉积物中取样。作为对照，在每个时间间隔还对含有沉积物的缩影进行了采样，这些沉积物含有原生的动物动物，但没有内部圆柱体。线虫将富集和未富集的沉积物定殖，其丰度高达对照的20％。无论采样时间如何，在富集处理中，物种的丰度和数量都显着更高，这表明食物的存在增强了定植和适应力。消失的沉积物中的线虫组合物种丰富，与对照不同。大多数定殖物种在对照中很少见或无法检测到，这表明可能存在突发性扰动，因为它们在深海沉积物中的持续存在。定殖部分取决于物种特征，例如大小和运动性。同时，大量不同的物种在空的圆柱体上定居，导致重复样本之间，尤其是富含硅藻的样本之间，群落组成的相似性很差。我们的结果表明，尽管高度可重复的丰度和多样性模式，最近扰动的沉积物的群落组成的可预测性差，并且为从高度局部的殖民化模式中出现的时空镶嵌提供了实验支持。

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