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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Zoogeomorphological behaviours in fish and the potential impact of benthic feeding on bed material mobility in fluvial landscapes
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Zoogeomorphological behaviours in fish and the potential impact of benthic feeding on bed material mobility in fluvial landscapes

机译：鱼类中的Zoogeomorphology行为以及底栖饲料对河床景观床材料的潜在影响

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摘要

Foraging by benthivorous fish can affect bed material mobility and sediment flux. This paper collates evidence of benthic feeding effects at local scales and evaluates the possibility that large numbers of foraging fish, each of which accomplishes a small amount of geomorphic work when feeding, may have a cumulative effect across river systems. A first synthesis of research from several disciplines provides a deeper understanding of how fish disturb and condition bed materials with implications for sediment mobility. To evaluate the spatial extent of benthic feeding and therefore the potential for it to have a large-scale effect, the distribution of benthivorous fish is established across a large river network. After quality control, the dataset yields a comprehensive set of fish community information based on over 61 000 individuals and 30 species at 176 sites. The factors that are likely to mediate foraging and its geomorphological effectiveness are considered. A novel scoring system that incorporates three key controls (fish feeding behaviour, fish abundance and fish body size) is then applied across the river network to predict where geomorphologically effective benthic feeding is feasible and its possible relative magnitude. Our results demonstrate, for the first time, that the potential for zoogeomorphic impacts is widespread but variable in space as a function of community composition and the abundance of key benthivores. An initial calibration against measured field impacts suggests that benthic feeding may cause measurable geomorphological disturbance at more than 90% of sites in this large network. Together, previous work and this unique analysis suggest that benthic feeding is sufficiently effective and extensive to warrant additional research. Investigating the role of benthivorous fish in fluvial geomorphology is important because it may yield results that challenge the assumption that biota are irrelevant sources of energy in geomorphological systems.
机译：孤独的鱼觅食可以影响床材料迁移率和沉积物。本文巩固了当地鳞片上底栖饲养效果的证据，并评估了大量觅食鱼的可能性，每种觅食鱼类在喂食时实现少量地貌工作，可能在河流系统上具有累积效应。来自多个学科的第一次合成研究提供了对鱼类干扰和病情床材料如何对沉积物流动的影响的深入了解。为了评估底栖饲养的空间程度，因此潜在的潜力具有大规模效应，在大河网络中建立了枯渴的鱼类的分布。在质量控制之后，数据集在176个地点基于超过61 000个以上的51 000个综合鱼群信息，并在30次。考虑了可能导致觅食的因素及其地貌效果。然后，将三种关键控制（鱼饲养行为，鱼类和鱼体尺寸）的新型评分系统被应用于河网，以预测地形上有效的底栖饲料是可行的，并且其可能的相对幅度。我们的结果首次证明了Zoogeomorphic影响的可能性是普遍的，但在空间中的变化是社区成分的函数和巨大的精神潜水病。针对测量场影响的初始校准表明，底栖饲料可能导致该大型网络中超过90％的位点导致可测量的地貌障碍。在一起，以前的工作和这种独特的分析表明，终身喂养是足够有效和广泛的，以保证额外的研究。调查孤独的鱼类在氟尿的角色中的作用很重要，因为它可能会产生挑战Biota在地貌系统中能量无关的假设的结果。

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