Selective exploitation of spatially structured coastal fish populations by recreational anglers may lead to evolutionary downsizing of adults
Selective exploitation of spatially structured coastal fish populations by recreational anglers may lead to evolutionary downsizing of adults
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DOI：
10.3354/meps10745
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发表时间：
2014-01-01
影响因子：
2.5
通讯作者：
Arlinghaus, Robert
中科院分区：
文献类型：
--
作者：
Alos, Josep;Palmer, Miquel;Arlinghaus, Robert
当基因流动受到限制而捕捞密集时，捕鱼可能会改变生命史，并有利于共同减少成年体型的性状组合。然而，关于小型沿海鱼类成体缩小的经验证据仍然很少，部分原因是对某些渔具的选择性缺乏了解，例如休闲垂钓，以及难以估计中上层早期生命阶段的分散情况。使用小身体的久坐的沿海海洋鱼类Serranus scriba作为模型，我们首先经验表明，休闲垂钓选择的生活史特征（即增加生殖投资），促进成年人缩小。其次，使用拉格朗日粒子扩散模型，我们展示了如何本地流体动力学产生的有限的连接模式和元人口结构的出现。最后，本文还讨论了目前在隔离种群中观察到的生活史。经历了不同捕捞压力的scriba与捕捞导致的成年体型缩小的预期相符。身体大小是水生食物网的一个重要特征，进化缩小可能会产生不可预见的后果。从预防的角度来看，保持集合种群结构和其中固有的全方位基因型是重要的，即使是对于主要由休闲垂钓者捕捞的小型身体，地理限制的鱼类也是如此。
When gene flow is limited and harvesting is intensive, fishing may alter life histories and favour trait combinations that collectively reduce adult body size. However, empirical evidence of downsizing of adults in small-bodied coastal fish is still scarce, in part due to the lack of knowledge about the selective nature of certain fishing gears, such as recreational angling, and the difficulties in estimating the dispersion of pelagic early-life stages. Using the small-bodied sedentary coastal marine fish Serranus scriba as a model, we first empirically show that recreational angling selects for life-history traits (i.e. increased reproductive investment) that promote downsizing of adults. Second, using Lagrangian particle dispersion modelling, we show how local hydrodynamics generates patterns of limited connectivity and the emergence of meta-population structure. Finally, the life histories presently observed in isolated populations of S. scriba that experienced differential fishing pressure matched expectations of fishing-induced downsizing of adult body size. Body size is an important trait in aquatic food webs, and evolutionary downsizing might have unforeseen consequences. From a precautionary perspective, maintaining the meta-population structure and the full range of genotypes inherent in them is important, even for small-bodied, geographically restricted fish species that are mainly harvested by recreational anglers.