Risk induced by a native top predator reduces alien mink movements.
Risk induced by a native top predator reduces alien mink movements.
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本地顶级捕食者引发的风险减少了外来水貂的活动。
DOI：
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发表时间：
2008
影响因子：
4.8
通讯作者：
E. Korpimäki
中科院分区：
文献类型：
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作者：
Pälvi Salo;Mikael Nordström;R. Thomson;E. Korpimäki
1.非致命捕食效应可能有更强的影响猎物种群比直接捕食的影响，这也应该适用于intraguild捕食。如果入侵性和潜在破坏性的外来捕食者充当了行会内的猎物，这种相互作用的后果就变得尤为重要。2.我们研究了捕食风险的影响，重新殖民本地顶级捕食者，白尾海雕（Haliaeetus albicilla），对Mustela vison（美国貂），在欧洲的外来捕食者的运动。我们radiocollared 20貂在两个研究领域的外群岛的波罗的海，芬兰西南部，在2004年和2005年。在群岛中，水貂的家域包括许多岛屿，水貂在岛屿之间游泳时最容易被鹰捕食。观察到的水貂的游泳距离进行了比较，预计在随机的距离，并解释从随机游泳的偏离水貂距离最近的鹰巢，水貂附近的位置，和水貂的家范围大小的鹰的意见数量。3.水貂减少了他们的游泳距离，增加海雕捕食风险：对于女性，减少10%，增加10鹰观察，和5%，每公里朝向鹰巢。男性的结论受到样本量小的限制。4.我们的研究结果表明，雌性水貂会根据鹰的捕食风险改变它们的行为，这可能会减少它们的种群增长，并对群岛中较低营养水平的鸟类、哺乳动物和两栖动物种群产生长期的连锁反应。通过带回顶级捕食者来恢复生态系统可能是减轻外来捕食者对本地生物群影响的一种方法。
1. Nonlethal predation effects may have stronger impacts on prey populations than direct predation impacts, and this should also apply to intraguild predation. The consequences of such interactions become especially important if invasive, and potentially destructive alien predators act as intraguild prey. 2. We studied the predation-risk impacts of a re-colonizing native top predator, Haliaeetus albicilla (white-tailed sea eagle), on the movements of Mustela vison (American mink), an alien predator in Europe. We radiocollared 20 mink in two study areas in the outer archipelago of the Baltic Sea, South-west Finland, during 2004 and 2005. In the archipelago, mink home ranges incorporate many islands, and mink are most predisposed to eagle predation while swimming between islands. Observed swimming distances of mink were compared to distances expected at random, and deviations from random swimming were explained by mink distance from nearest eagle nest, number of eagle observations near mink location, and mink home-range size. 3. Mink reduced their swimming distances with increasing sea eagle predation risk: for females, the reduction was 10% for an increase of 10 eagle observations, and 5% for each kilometre towards an eagle nest. Conclusions for males were restricted by their small sample size. 4. Our results suggest that female mink modify their behaviour according to eagle predation risk, which may reduce their population growth and have long-term cascading effects on lower trophic levels including bird, mammal and amphibian populations in the archipelago. Ecosystem restoration by bringing back the top predators may be one way of mitigating alien predator effects on native biota.