A Global Synthesis on Land‐Cover Changes in Watersheds Shaping Freshwater Detrital Food Webs

作者：Rebecca Oester, François Keck, Marcelo S. Moretti, Florian Altermatt, Andreas Bruder, Verónica Ferreira · 发表于：Global Change Biology · 年份：2025 · DOI：10.1111/gcb.70380 · 被引用次数：6 · 研究领域：Isotope Analysis in Ecology、Fish Ecology and Management Studies、Aquatic Ecosystems and Phytoplankton Dynamics

Anthropogenic land-cover changes are among the most pressing global threats to both aquatic and terrestrial ecosystems, jeopardizing biodiversity and the critical connections between these systems. Resource flows and trophic interactions intricately link aquatic and terrestrial ecosystems, with terrestrial-derived detritus playing a fundamental role in supporting aquatic food webs. These detrital inputs form essential cross-ecosystem linkages, underpinning key ecological processes and providing vital resources for aquatic communities. Yet, little research has focused on how land-cover changes cascade across this linkage. To better understand how land-cover changes in the watershed influence freshwater detrital food webs, we conducted a meta-analysis of field studies reporting the effects of vegetation changes on freshwater detrital consumers and organic matter decomposition. The results from 144 studies, reporting 1235 comparisons, showed that, overall, land-cover changes in the watershed vegetation, especially through harvest and land-use conversion, have negative effects on aquatic biodiversity and ecosystem processes. These vegetation changes reduced diversity, abundance, and biomass across multiple trophic levels in freshwater detrital food webs. Studies examining multiple organism groups most often observed negative responses across multiple trophic levels, suggesting that these land-cover changes negatively affected multiple detrital food-web components simultaneously. ...