Individual variation and vulnerability to angling: No apparent behavioral differences among fish captured using different fishing gears

Individual variation and vulnerability to angling: No apparent behavioral differences among fish captured using different fishing gears
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个体差异和钓鱼的脆弱性:使用不同渔具捕获的鱼之间没有明显的行为差异

DOI:
10.1111/eth.13238
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发表时间:
2021
期刊:
影响因子:
1.7
通讯作者:
Goymann, ed., Wolfgang
Goymann, ed., Wolfgang
中科院分区:
生物学3区
文献类型:
--
作者:
Pollack, Lea;Wiltsee, Laura;Beittel, Alice;Ganzorig, Batsaikhan;Jensen, Olaf P.;Goymann, ed., Wolfgang

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众所周知,捕鱼是有尺寸选择性的,但收获也可能无意中针对某些行为类型或个性。种群内行为类型丰度的变化会对渔业管理产生影响,包括影响捕获率、个体生长和食物网动态。通过河边行为分析,我们量化了蒙古北部贝加尔湖河鳟(Thymallus baicalensis)行为的重复性,贝加尔湖河鳟是一种流行的运动鱼,也是当地重要的捕食者。我们评估了不同的钓鱼技术(即飞钓或旋转装置)是否收集了不同的行为类型,以及行为的变化是否与身体状况或饮食有关(即使用稳定同位素分析)。令人惊讶的是,我们没有发现任何证据表明该人群中的几种行为存在一致的个体差异。此外,平均行为的差异不能通过钓鱼装备、身体状况或碳和氮同位素特征来预测。我们认为,由于这是一个捕捞种群,种群的行为变异范围可能通过之前的行为选择性捕捞而减少。这可能解释了两种渔具捕获的鱼之间的平均行为缺乏差异,以及缺乏样本群体内一致的个体行为差异的证据。
It is well known that fishing is size‐selective, but harvest may also inadvertently target certain behavioral types or personalities. Changes in the abundance of behavioral types within a population have implications for fisheries management, including affecting catch rates, individual growth, and food web dynamics. Using streamside behavioral assays, we quantified the repeatability of behaviors in a population of Baikal grayling (Thymallus baicalensis) in northern Mongolia, a popular sport fish and important local predator. We assessed whether different angling techniques (i.e., fly or spinning gear) collected different behavioral types and whether variation in behavior was associated with body condition or diet (i.e., using stable isotope analysis). Surprisingly, we found no evidence for consistent individual differences in several behaviors within this population. Furthermore, differences in mean behaviors were not predicted by angling gear, body condition, or carbon and nitrogen isotopic signatures. We suggest that since this is a fished population, the range of behavioral variability in the population may have been reduced through previous behaviorally selective harvest. This might explain both the lack of difference in mean behaviors between fish caught by both gear types and the lack of evidence for consistent individual differences in behavior within the sampled population.
实验规模选择性捕捞影响群居鱼类的行为类型
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