Université de Pau & des Pays de l'Adour, e2s, INRAE, UMR 1224 Ecobiop, Saint-Pée sur Nivelle, France.
Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, USA.
J Fish Biol. 2020 Apr;96(4):925-938. doi: 10.1111/jfb.14282. Epub 2020 Mar 2.
We assessed the effects of sexual maturity on space use in Atlantic salmon (Salmo salar) parr as facultative early maturation enables us to work on individuals belonging to the same cohort. We monitored the space use of 40 1-year-old males in natura throughout a breeding season. First, mature individuals covered longer distances (absolute and upstream) and located within broader home ranges than immature parr. Second, sexual maturity also generated a higher interindividual variability in space use. Finally, mature individuals exhibited a higher probability of association with likely breeding sites on average. However, some mature individuals experienced a lower probability than immature individuals, suggesting that the space use of some mature individuals may not be optimal. Moreover, mature parr exploiting a broader home range or covering longer upstream distances had a higher probability of association with likely breeding sites. Covering longer upstream distances may therefore increase the reproductive success of mature parr, while involving higher energetic costs and a greater risk of predation.
我们评估了性成熟对大西洋鲑（Salmo salar）幼鱼空间利用的影响，因为有性早熟的个体可以让我们对同一批个体进行研究。我们在整个繁殖季节监测了 40 条 1 岁雄性幼鱼的自然空间利用情况。首先，成熟个体的绝对距离和上游距离更长，栖息范围更广。其次，性成熟也导致了个体之间空间利用的更高变异性。最后，成熟个体与潜在繁殖地的平均关联概率更高。然而，一些成熟个体的关联概率低于未成熟个体，这表明一些成熟个体的空间利用可能不是最优的。此外，利用更大栖息范围或覆盖更长上游距离的成熟幼鱼与潜在繁殖地的关联概率更高。因此，覆盖更长的上游距离可能会增加成熟幼鱼的繁殖成功率，尽管这涉及更高的能量成本和更大的被捕食风险。
