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首页> 外文期刊>Biological Invasions >Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment
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Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment

机译:天然微捕食者丰度的变化说明了在自然不稳定的环境中招募了一种流动性入侵鱼类即鲤鱼

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Why certain species of fish become invasive is poorly understood and a key obstacle to restoring many of the world’s ecosystems. In this study we tested whether variation in biotic resistance exerted by native predators might explain the reproductive success of the common carp, a large and fecund invasive species that typically spawns in outlying and unstable shallow habitat. An initial three-year study of the relative abundance of young-of-year (YOY) carp in interconnected lakes in the Upper Mississippi River Basin discovered that YOY carp are only found in shallow waters that experience winter hypoxia (winterkill) and have low densities of the native egg-predators that otherwise dominate these locales. A follow-up experiment tested if native fish predation on carp eggs could explain this distribution. It found that while carp eggs survived in winterkill lakes, they only survived in non-winterkill lakes when protected by a mesh that excluded fish. Large numbers of carp eggs were found in the stomachs of native fish inhabiting lakes that did not winterkill. We conclude that common carp, and likely many other highly mobile and fecund invasive fish, have evolved life histories to avoid egg predators and can become invasive when they are absent.
机译:对某些鱼类为何会入侵的原因知之甚少,这是恢复世界许多生态系统的主要障碍。在这项研究中,我们测试了自然捕食者施加的生物抗性变化是否可以解释鲤鱼的繁殖成功,鲤鱼是一种大型的,繁殖力强的入侵物种,通常在外围和不稳定的浅层栖息地产卵。对密西西比河上游流域互连湖中年幼鲤鱼相对丰度的最初三年研究发现,仅在经历冬季缺氧(冬季杀灭)且密度低的浅水域中发现了年青鲤鱼否则,这些地方占主导地位的本地鸡蛋捕食者。后续实验测试了鲤鱼卵上的本地鱼类捕食是否可以解释这种分布。研究发现,虽然鲤鱼卵在温特基尔湖中生存,但只有在网状鱼类保护下才可以在非温特基尔湖中生存。在栖息于湖中的冬鱼的胃中发现了大量鲤鱼卵,但并未杀死它们。我们得出的结论是,鲤鱼,以及可能还有许多其他高度活动和繁殖力强的入侵鱼类,已经进化出生活史来避免卵捕食者,并且在缺乏捕食者时会变得具有入侵性。

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