Opposing trends in survival and recruitment slow the recovery of a historically overexploited fishery
Opposing trends in survival and recruitment slow the recovery of a historically overexploited fishery
复制标题
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
DOI：
10.1139/cjfas-2021-0161
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Ives, Anthony R.
中科院分区：
文献类型：
--
作者：
Phillips, Joseph S.;Guðbergsson, Guðni;Ives, Anthony R.
量化人口变化率的时间变化是人口生态学的核心目标。在这项研究中，我们分析了一个几十年的年龄结构的时间序列北极红点鲑（红点鲑alpinus）丰富的湖，冰岛，推断随时间变化的人口响应减少收获渔业崩溃后。我们的分析表明，虽然成年人的生存概率增加后，减轻收获压力，人均招聘量持续下降，在大部分的研究期间，直到最后三年，当它开始增加。相反的人口趋势只导致人口总数和人口增长率发生有限的方向性变化。相反，人口动态主要是由大的年际变化和向老年人分布的转变。我们的研究结果表明，尽管放松收获后成年人的数量有所增加，但种群在崩溃后恢复缓慢。这突出表明，由于管理工作所处的复杂生态环境，人口对管理工作的反应可能具有异质性。
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.