Seston capture by Hydropsyche siltalai and the accuracy of capture efficiency estimates
Seston capture by Hydropsyche siltalai and the accuracy of capture efficiency estimates
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DOI：
10.1111/j.1365-2427.2004.01311.x
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发表时间：
2005-01-01
影响因子：
2.7
通讯作者：
Humphries, S
中科院分区：
文献类型：
--
作者：
Brown, SA;Ruxton, GD;Humphries, S
1.摘要毛翅目无壳石蛾幼虫的悬浮取食是溪流和河流能量流动的主要途径，并强烈影响生产力。考虑到这些动物对湖泊生态系统的影响，受到一项研究的强烈影响，该研究调查了一种水囊石蚕蛾建造的网的颗粒捕获效率。在适当的空间尺度上使用水采样技术，并考虑到当地的流体动力学比以前，我们研究了颗粒的大小-频率分布的网的水蚤siltalai。我们的研究结果证实了捕获网在颗粒尺寸方面是有选择性的，并且还表明这种选择性是针对可能提供最多能量的颗粒。通过将无壳石蛾幼虫的网周围的流量分流的估计，我们表明，捕获效率（CE）是相当高的比以前估计的，并得出结论，需要更多地考虑当地的流体动力学来评估粒子捕获的效率。我们用我们的研究结果来假设一个机械的解释最近的例子种间促进，从而减少近床的速度在单一物种的单一栽培导致增加捕获率和本地耗尽悬浮物的区域内的速度降低。
1. Suspension feeding by caseless caddisfly larvae (Trichoptera) constitutes a major pathway for energy flow, and strongly influences productivity, in streams and rivers.2. Consideration of the impact of these animals on lotic ecosystems has been strongly influenced by a single study investigating the efficiency of particle capture of nets built by one species of hydropsychid caddisfly.3. Using water sampling techniques at appropriate spatial scales, and taking greater consideration of local hydrodynamics than previously, we examined the size-frequency distribution of particles captured by the nets of Hydropsyche siltalai. Our results confirm that capture nets are selective in terms of particle size, and in addition suggest that this selectivity is for particles likely to provide the most energy.4. By incorporating estimates of flow diversion around the nets of caseless caddisfly larvae, we show that capture efficiency (CE) is considerably higher than previously estimated, and conclude that more consideration of local hydrodynamics is needed to evaluate the efficiency of particle capture.5. We use our results to postulate a mechanistic explanation for a recent example of interspecific facilitation, whereby a reduction of near-bed velocities seen in single species monocultures leads to increased capture rates and local depletion of seston within the region of reduced velocity.