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Model of optimal current feeding in zooplankton

机译：浮游动物的最佳电流馈送模型

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Zooplankton feeding formulations in plankton models have exclusively focused on the relation between food concentration and ingestion, with respiration and excretion being treated separately, despite experimental evidence for strong links among these processes. We present an optimal current-feeding model linking ingestion, respiration, and assimilation efficiency to foraging activity. The Ivlev model is a special case of our optimal current-feeding model, which applies to static feeding behaviour. We validate our model with experimental data for copepods, ciliates, and dinoflagellates. Parameter estimates suggest that phylogenetic grouping is more important than predator size in determining feeding behaviour. Respiratory costs of foraging, e.g. for generating a feeding current, may be much larger than previously thought, are larger in smaller organisms, and might explain the independent development of feeding thresholds in different micro- and mesozooplank-ton groups. Both preferential feeding on, and lower feeding thresholds for, larger food particles are predicted to derive from greater capture efficiency owing to enhanced detectability of larger particles. The relation between feeding threshold and prey size appears to depend on feeding strategy but not on predator size, as a common relationship seems to apply for current feeders (ciliates and cope-pods) spanning a vast size range. Our model exhibits an inverse relationship between ingestion and assimilation efficiency, reducing the contribution of copepods to export of organic matter relative to remineralisation at low food concentrations. Export ratio variations previously thought to require strong shifts in community composition can be generated by changes in feeding behaviour predicted by our model.
机译：浮游生物模型中的浮游动物摄食配方只专注于食物浓度与摄食之间的关系，尽管呼吸和排泄物在这些过程之间有很强的联系，但它们分别进行处理。我们提出了一种优化的当前摄食模型，将摄食，呼吸和同化效率与觅食活动联系起来。 Ivlev模型是我们最优电流馈送模型的特例，该模型适用于静态馈电行为。我们用co足类，纤毛虫和鞭毛鞭毛虫的实验数据验证了我们的模型。参数估计表明，在确定摄食行为方面，系统发育分组比捕食者大小更重要。觅食的呼吸费用，例如产生摄食电流的方法可能比以前认为的要大得多，在较小的生物体中可能更大，并且可能解释了不同的微囊和中指浮游动物群体中摄食阈值的独立发展。由于较大颗粒的可检测性增强，因此预测较大颗粒食物的优先进食和较低进食阈值都将源自更高的捕获效率。摄食阈值与猎物大小之间的关系似乎取决于摄食策略，而不取决于捕食者的大小，因为一种常见的关系似乎适用于跨越很大尺寸范围的当前饲养者（纤毛虫和co足类）。我们的模型显示出摄食与同化效率之间呈反比关系，与低食物浓度下的再矿化相比，reducing足类动物对有机物出口的贡献减少。以前认为需要社区组成发生重大变化的出口比例变化可能是由我们的模型预测的进食行为变化引起的。

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