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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >Experimental mixing of a north-temperate lake: testing the thermal limits of a cold-water invasive fish
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Experimental mixing of a north-temperate lake: testing the thermal limits of a cold-water invasive fish

机译：北部温带湖泊的实验混合：测试冷水入侵鱼类的温度极限

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摘要

Species' thermal limits play a key role in determining spatial distributions and understanding their response to changing environments. Manipulation of thermal habitat is a potential avenue of exploration for management of invasive species such as the cold-water rainbow smelt(Osmerus mordax), which has adverse effects on native fish communities in central North American inland lakes. In an effort to test the thermal limits and selectively eradicate rainbow smelt, we experimentally mixed Crystal Lake, Wisconsin, USA, during summer of 2012 and 2013 to warm the hypolimnion and eliminate cold-water habitat. This whole-ecosystem manipulation allowed for field testing of published thermal thresholds reported for rainbow smelt. The rainbow smelt population responded to the thermal manipulation by exhibiting unexpected shifts in behavior, intrapopulation divergence in body condition, and significant population declines. Small individuals of each adult age-class tended to survive the manipulation, and the population persisted despite high mortality rates. Our results indicate a high degree of size-based intrapopulation variation in thermal sensitivity for this species. Our findings also raise questions regarding applicability of lab-and model-derived thermal limits to field scenarios, highlighting a need for further field evaluations of species' thermal limits.
机译：物种的热极限在确定空间分布和了解其对变化的环境的响应中起着关键作用。操纵热生境是管理入侵物种（例如冷水彩虹熔炼（Osmerus mordax））的潜在探索途径，这对北美中部内陆湖泊的本地鱼类群落产生了不利影响。为了测试温度极限并有选择地消除彩虹的气味，我们在2012年和2013年夏季对美国威斯康星州的水晶湖进行了实验混合，以加热次冷水并消除冷水栖息地。这种对整个生态系统的操作允许对已报告的彩虹熔炼温度阈值进行现场测试。彩虹熔炼种群对热操纵的反应是表现出意想不到的行为变化，体内状况的种群内差异以及种群的显着下降。每个成年年龄段的小个体都倾向于幸免于难，尽管死亡率很高，但该种群仍然存在。我们的结果表明该物种的热敏感性高度基于大小的种群内变化。我们的发现还引发了有关实验室和模型得出的热极限在野外情景中的适用性的问题，强调了需要对物种的热极限进行进一步的野外评估。

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