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首页> 外文期刊>Belgian Journal of Zoology >Effect of prey- and predator size on the capture success of an aquatic snake
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Effect of prey- and predator size on the capture success of an aquatic snake

机译：捕食者和捕食者的大小对水生蛇捕捉成功的影响

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摘要

Large aquatic snakes typically do not include small prey into their diet. This is hypothesized to be so because small preys are difficult to catch in an aquatic environment. Also an effect of snake size on capture success is plausible, with large snakes having a lower capture success then small snakes for similarly sized prey. We tested the effect of snake- and prey-size on the capture success of the specialized aquatic snake Natrix tesselata. No effect of snake size on capture success was found for the size range that was tested. Possibly size becomes only important from a minimum absolute size (larger than the maximal size tested in our study) onwards. Unexpectedly, Natrix tesselata needs fewer attempts to capture small fish. In contrast, N. maura, a congeneric more generalist species, needs fewer attempts to capture larger fish. A possible explanation for this conundrum lies in difference in the degree of specialization between these two species. An in-depth study of the hydrodynamics of this snake-prey system could provide ways to evaluate the importance of size effects.
机译：大型水生蛇通常在饮食中不包括小猎物。假设是这样，因为在水生环境中很难捕获小猎物。蛇的大小对捕获成功的影响也是合理的，大蛇的捕获成功率比小蛇的捕获成功率低。我们测试了蛇和猎物大小对专业水生蛇Natrix tesselata捕获成功的影响。对于所测试的尺寸范围，未发现蛇的大小对捕获成功的影响。从最小绝对尺寸（大于我们的研究中测试的最大尺寸）开始，尺寸可能才变得重要。出乎意料的是，Natrix tesselata需要更少的尝试来捕获小鱼。相比之下，毛拉猪笼草（N. maura）是一种较普遍的同类动物，需要较少的捕获较大鱼类的尝试。这种难题的可能解释是这两个物种之间的专业化程度不同。对这种蛇捕食系统的流体动力学的深入研究可以提供方法来评估尺寸效应的重要性。

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