期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2102733118
关键词
fragmentation; habitat changes; heterogeneous landscapes; trophic interactions
资金
- National Natural Science Foundation of China [31988102, 31870505]
- German Research Foundation (DFG) through the Research Unit [FOR-2716]
- German Centre for Integrative Biodi-versity Research (iDiv) Halle-Jena-Leipzig [DFG: FZT 118, 202548816]
- TULIP Laboratory of Excellence [ANR-10-LABX-41]
The study extends the theory of metapopulation capacity to predict the persistence of trophically interacting species, providing a method to forecast food chain length and biodiversity changes in fragmented landscapes. The impact of habitat changes on biodiversity can be predicted from changes in metapopulation capacity or changes in the fraction of empty patches.
Metapopulation capacity provides an analytic tool to quantify the impact of landscape configuration on metapopulation persistence, which has proven powerful in biological conservation. Yet surprisingly few efforts have been made to apply this approach to multispecies systems. Here, we extend metapopulation capacity theory to predict the persistence of trophically interacting species. Our results demonstrate that metapopulation capacity could be used to predict the persistence of trophic systems such as prey- predator pairs and food chains in fragmented landscapes. In particular, we derive explicit predictions for food chain length as a function of metapopulation capacity, top-down control, and population dynamical parameters. Under certain assumptions, we show that the fraction of empty patches for the basal species provides a useful indicator to predict the length of food chains that a fragmented landscape can support and confirm this prediction for a host-parasitoid interaction. We further show that the impact of habitat changes on biodiversity can be predicted from changes in metapopulation capacity or approximately by changes in the fraction of empty patches. Our study provides an important step toward a spatially explicit theory of trophic metacommunities and a useful tool for predicting their responses to habitat changes.
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