Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Quantifying temporal variation in demographic rates is a central goal of population ecology. In this study, we analyzed a multidecadal age-structured time series of Arctic char (Salvelinus alpinus) abundance in Lake Mývatn, Iceland, to infer the time-varying demographic response of the population to reduced harvest in the wake of the fishery’s collapse. Our analysis shows that while survival probability of adults increased following the alleviation of harvesting pressure, per capita recruitment consistently declined over most of the study period, until the final three years when it began to increase. The countervailing demographic trends resulted in only limited directional change in the total population size and population growth rate. Rather, the population dynamics were dominated by large interannual variability and a shift towards an older age distribution. Our results are indicative of a slow recovery of the population after its collapse, despite the rising number of adults following relaxed harvest. This underscores the potential for heterogeneous demographic responses to management efforts due to the complex ecological context in which such efforts take place.

中文翻译：

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生存和补充的相反趋势减缓了历史上过度开发的渔业的恢复

加拿大渔业和水生科学杂志，印刷前。
量化人口比率的时间变化是人口生态学的核心目标。在这项研究中，我们分析了冰岛米湖 (Lake Mývatn) 的北极红点鲑 (Salvelinus alpinus) 丰度的多年代际年龄结构时间序列，以推断在渔业崩溃后人口对减产的随时间变化的人口统计反应。我们的分析表明，虽然随着收割压力的减轻，成年人的生存概率增加了，但在研究期间的大部分时间里，人均招聘人数一直在下降，直到最后三年才开始增加。抵消的人口趋势导致总人口规模和人口增长率的方向变化有限。相当，人口动态主要由较大的年际变化和向老年分布转变。我们的结果表明，尽管在放松收割后成年人数量增加，但人口在崩溃后缓慢恢复。这强调了由于发生此类努力的复杂生态环境，人口对管理努力的异质反应的潜力。