赶走海虱：跳跃行为可去除野生幼年红大马哈鱼（Oncorhynchus nerka）身上的海虱。

Oust the louse: leaping behaviour removes sea lice from wild juvenile sockeye salmon Oncorhynchus nerka.

作者信息

Atkinson Emma M, Bateman Andrew W, Dill Lawrence M, Krkošek Martin, Reynolds John D, Godwin Sean C

机构信息

Earth to Ocean Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada.

Department of Geography, University of Victoria, Victoria, British Columbia, Canada.

出版信息

J Fish Biol. 2018 Aug;93(2):263-271. doi: 10.1111/jfb.13684.

DOI:10.1111/jfb.13684

PMID:29956312

Abstract

We conducted a manipulative field experiment to determine whether the leaping behaviour of wild juvenile sockeye salmon Oncorhynchus nerka dislodges ectoparasitic sea lice Caligus clemensi and Lepeophtheirus salmonis by comparing sea-lice abundances between O. nerka juveniles prevented from leaping and juveniles allowed to leap at a natural frequency. Juvenile O. nerka allowed to leap had consistently fewer sea lice after the experiment than fish that were prevented from leaping. Combined with past research, these results imply potential costs due to parasitism and indicate that the leaping behaviour of juvenile O. nerka does, in fact, dislodge sea lice.

摘要

我们进行了一项控制性野外实验，通过比较被阻止跳跃的红大麻哈鱼幼鱼与以自然频率跳跃的幼鱼之间的海虱丰度，来确定野生红大麻哈鱼幼鱼的跳跃行为是否会去除体表寄生的海虱（克氏海虱和鲑居尾孢虫）。实验结束后，允许跳跃的红大麻哈鱼幼鱼身上的海虱数量始终少于被阻止跳跃的鱼。结合过去的研究，这些结果表明了寄生带来的潜在代价，并表明红大麻哈鱼幼鱼的跳跃行为实际上确实能去除海虱。