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首页> 外文会议>International Symposium on Aquatic Oligochaeta >Selective feeding by the aquatic oligochaete Tubifex tubifex (Tubificidae, Clitellata)
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Selective feeding by the aquatic oligochaete Tubifex tubifex (Tubificidae, Clitellata)

机译：由水生oligochaete Tubifex Tubifex（Cubificae，Clitellata）选择性喂养

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摘要

The particle size distribution of faecal pellets produced by the tubificid worm Tubifex tubifex in laboratory culture, was measured with a Coulter Multisizer. The faecal material from worms cultured in a range of sediments was composed of particles with a mean diameter of less than 63 μm, and only a few isolated larger particles were found by microscopic analysis. This suggests that this species actively selects the silt-clay fraction, avoiding larger sand particles. A more detailed analysis of faeces revealed that about 75%, by volume, was composed of particles with a mean diameter <25 μm, and the mode was <10μm. T. tubifex fed selectively on the organic rich particles of the sediment, and this feeding was independent of particle size. Measurement of the organic content of faeces (measured as % loss on ignition) showed that they had a consistently higher organic content than the sediment, considered as whole sediments or the <63 μm sieved fraction. On the basis of these results, we hypothesise that this species exhibits two levels of selectivity in its feeding behaviour. Thus selection is primarily based on particle size, avoiding the ingestion of sand particles and also, on the preferential selection of particles associated with organic material, within the fine (silt-clay) fraction of the sediment.
机译：用Coulter Multisizer测量通过实验室培养的Cubificid蠕虫蒸烟管产生的粪便颗粒的粒度分布。来自在一系列沉积物中培养的蠕虫的粪便材料由平均直径小于63μm的颗粒组成，并且仅通过微观分析发现少量分离的较大粒子。这表明该物种主动选择淤泥粘土馏分，避免较大的砂颗粒。对粪便的更详细分析显示，大约75％，体积由平均直径<25μm的颗粒组成，并且该模式<10μm。 T. Tupifex选择性地喂食沉积物的有机丰富的颗粒，并且这种进料与粒度无关。测量粪便的有机含量（测量为点火物质损失）表明它们具有比沉积物始终如一的有机含量，被认为是整个沉积物或<63μm筛分的级分。在这些结果的基础上，我们假设该物种在其饲养行为中表现出两种含量的选择性。因此选择主要基于粒度，避免摄取砂颗粒，并且还避免在沉积物的细（淤泥粘土）部分内与有机材料相关的颗粒。

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