Institut de Biologie Intégrative et des Systèmes (IBIS), Pavillon Charles-Eugène Marchand, Université Laval, Québec, QC, Canada, G1V 0A6.
Mol Ecol. 2013 Jan;22(1):187-200. doi: 10.1111/mec.12102. Epub 2012 Nov 19.
In this study, we documented the breeding system of a wild population of Atlantic salmon (Salmo salar L.) by genetically sampling every returning adult and assessed the determinants of individual fitness. We then quantified the impacts of catch and release (C&R) on mating and reproductive success. Both sexes showed high variance in individual reproductive success, and the estimated standardized variance was higher for males (2.86) than for females (0.73). We found a weak positive relationship between body size and fitness and observed that fitness was positively correlated with the number of mates, especially in males. Mature male parr sired 44% of the analysed offspring. The impact of C&R on the number of offspring was size dependent, as the reproductive success of larger fish was more impaired than smaller ones. Also, there was an interactive negative effect of water temperature and air exposure time on reproductive success of C&R salmon. This study improves our understanding of the complex reproductive biology of the Atlantic salmon and is the first to investigate the impact of C&R on reproductive success. Our study expands the management toolbox of appropriate C&R practices that promote conservation of salmon populations and limit negative impacts on mating and reproductive success.
在这项研究中，我们通过对每一条洄游的成年大西洋鲑（Salmo salar L.）进行基因采样，记录了一个野生大西洋鲑种群的繁殖系统，并评估了个体适应度的决定因素。然后，我们量化了捕捞和释放（C&R）对交配和繁殖成功的影响。两性的个体繁殖成功率都存在很大差异，雄性（2.86）的估计标准化方差高于雌性（0.73）。我们发现体型与适应度之间存在微弱的正相关关系，并且观察到适应度与配偶数量呈正相关，尤其是在雄性中。成熟的雄性幼鱼（parr）孕育了 44%的分析后代。C&R 对后代数量的影响与体型有关，因为体型较大的鱼类繁殖成功率受影响更大。此外，水温与空气暴露时间对 C&R 鲑鱼繁殖成功率存在交互负效应。这项研究增进了我们对大西洋鲑复杂繁殖生物学的理解，也是首次调查 C&R 对繁殖成功的影响。我们的研究扩展了适当的 C&R 实践的管理工具包，这些实践有助于保护鲑鱼种群并限制对交配和繁殖成功的负面影响。
