Whole-lake influences of littoral structural complexity and prey body morphology on fish predator-prey interactions
Whole-lake influences of littoral structural complexity and prey body morphology on fish predator-prey interactions
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DOI：
10.1111/j.1600-0633.2006.00158.x
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发表时间：
2006-09-01
影响因子：
1.8
通讯作者：
Kitchell, J. F.
中科院分区：
文献类型：
--
作者：
Sass, G. G.;Gille, C. M.;Kitchell, J. F.
我们使用了延绳拴系的方法来研究猎物避难所，猎物的身体形态和捕食死亡率的位置和幅度之间的关系在一个单独的湖泊和三个不同的粗木质栖息地（CWH）和水生植物丰度的湖泊。捕食事件是最低的大型植物和/或CWH避难所，达到顶峰或刚刚超过避难所的边缘，并在湖泊的远洋部分下降。在避难所边缘和刚刚超越的捕食风险与丰富的沿岸的避难所呈正相关。与此相反，捕食事件的避难所内，并在远洋区呈负相关的沿岸的避难所丰度。深体和多刺的猎物形态不太容易被捕食比梭形猎物缺乏鳍刺。沿岸的带和猎物鱼的身体形态结构的复杂性可能会影响捕食者-猎物相互作用的结果，并最终决定在湖泊中的鱼类组合。
We used a longline tethering method to examine the relationship between prey refugia, prey body morphology and the location and magnitude of predation mortality within an individual lake and among three lakes that differed in coarse woody habitat (CWH) and aquatic macrophyte abundances. Predation events were lowest in the macrophyte and/or CWH refuges, peaked at or just beyond the refuge edge and declined in pelagic portions of the lakes. Predation risk at the refuge edge and just beyond was positively correlated with the abundance of littoral refuge. In contrast, predation events within the refuge and in the pelagic zone were negatively correlated with littoral refuge abundance. Deep-bodied and spiny prey morphologies were less vulnerable to predation than fusiform prey lacking fin spines. The structural complexity of littoral zones and prey fish body morphology may influence the outcome of predator-prey interactions and ultimately determine fish species assemblages in lakes.