期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms12025
关键词
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资金
- Fond Francais pour l'Environnement Mondial (FFEM)
- Fondation pour la Recherche sur la Biodiversite (FRB) within the project 'Modeling BIOdiversityand land use interactions under changing glacial water availability in Tropical High Andean Wetlands' (BIOTHAW, AAP-SCEN-II)
Glacier retreat is a worldwide phenomenon with important consequences for the hydrological cycle and downstream ecosystem structure and functioning. To determine the effects of glacier retreat on aquatic communities, we conducted a 4-year flow manipulation in a tropical glacier-fed stream. Compared with an adjacent reference stream, meltwater flow reduction induces significant changes in benthic fauna community composition in less than 2 weeks. Also, both algal and herbivore biomass significantly increase in the manipulated stream as a response to flow reduction. After the flow reduction ceased, the system requires 14-16 months to return to its pre-perturbation state. These results are supported by a multi-stream survey of sites varying in glacial influence, showing an abrupt increase in algal and herbivore biomass below 11% glacier cover in the catchment. This study shows that flow reduction strongly affects glacier-fed stream biota, prefiguring profound ecological effects of ongoing glacier retreat on aquatic systems.
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