期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2102179118
关键词
food web; invasive species; stable isotope; lake trout; bull trout
资金
- US Geological Survey (USGS) Biological Threats Program
- University of Montana's Flathead Lake Biological Station (FLBS)
- USGS
- FLBS
The invasion of the lake trout species has caused significant nutrient disruption in freshwater food webs, leading to increased variability in fish diets and displacement of native fish from their reference diets. Over time, the native apex predator, bull trout, experienced nutrient dispersion before displacement, resulting in their functional loss in late-invasion food webs.
Species invasions can have substantial impacts on native species and ecosystems, with important consequences for biodiversity. How these disturbances drive changes in the trophic structure of native food webs through time is poorly understood. Here, we quantify trophic disruption in freshwater food webs to invasion by an apex fish predator, lake trout, using an extensive stable isotope dataset across a natural gradient of uninvaded and invaded lakes in the northern Rocky Mountains, USA. Lake trout invasion increased fish diet variability (trophic dispersion), displaced native fishes from their reference diets (trophic displacement), and reorganized macroinvertebrate communities, indicating strong food web disruption. Trophic dispersion was greatest 25 to 50 y after colonization and dissipated as food webs stabilized in later stages of invasion (>50 y). For the native apex predator, bull trout, trophic dispersion preceded trophic displacement, leading to their functional loss in late-invasion food webs. Our results demonstrate how invasive species progressively disrupt native food webs via trophic dispersion and displacement, ultimately yielding biological communities strongly divergent from those in uninvaded ecosystems.
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