期刊
ECOLOGY LETTERS
卷 25, 期 4, 页码 863-875出版社
WILEY
DOI: 10.1111/ele.13963
关键词
age structure; climate change; demographic modelling; density dependence; exploitation; extreme events; life history; population viability; resource competition; sustainability
类别
资金
- Norwegian Research Council [223257, 244647, 276080]
- Centre for Biodiversity Dynamics at the Norwegian University of Science and Technology
The impacts of harvesting on population dynamics depend on the type and strength of density-dependent regulation. Low to moderate harvesting can buffer populations against environmental perturbations by reducing their impacts through density-dependent environmental stochasticity and intra-specific resource competition. This study suggests that low to moderate harvesting may enhance population resistance to climate variability and extreme weather.
Harvesting can magnify the destabilising effects of environmental perturbations on population dynamics and, thereby, increase extinction risk. However, population-dynamic theory predicts that impacts of harvesting depend on the type and strength of density-dependent regulation. Here, we used logistic population growth models and an empirical reindeer case study to show that low to moderate harvesting can actually buffer populations against environmental perturbations. This occurs because of density-dependent environmental stochasticity, where negative environmental impacts on vital rates are amplified at high population density due to intra-specific resource competition. Simulations from our population models show that even low levels of harvesting may prevent overabundance, thereby dampening population fluctuations and reducing the risk of population collapse and quasi-extinction following environmental perturbations. Thus, depending on the species' life history and the strength of density-dependent environmental drivers, low to moderate harvesting can improve population resistance to increased climate variability and extreme weather expected under global warming.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据