期刊
INLAND WATERS
卷 12, 期 4, 页码 434-450出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/20442041.2021.2021776
关键词
biofilm community; climate change; conservation ecology; damming; ecotoxicology; macroinvertebrates
资金
- Government of Catalonia, through the Agencia de Gestio d'Ajuts Universitaris i de Recerca [2020FI_B1 00098]
Climate change, damming, and metal pollution are significant anthropogenic threats to headwater streams. A case study demonstrates that these stressors have a significant impact on the ecosystem structure of headwater streams, leading to reduced biodiversity and increased biomass. This situation is expected to worsen in the context of climate change. Maintaining an appropriate ecological flow is crucial to mitigate these impacts.
Climate change, damming, and metal pollution are among the main anthropogenic threats to headwater streams. We designed a case study to assess how these stressors impact the ecosystem structure of headwater streams by using the biofilm and macroinvertebrate communities of a Pyrenean stream. We observed a strong seasonal pattern in the stream that interacted with the analysed stressors by having synergistic, but also antagonistic, responses on the ecosystem structural parameters. Both damming and a decrease in precipitation reduced the water flow of the stream and increased its temperature, which promoted an increase in algal and macroinvertebrate biomass at the expense of the biodiversity of their communities, a situation expected to worsen in a climate change context. The decrease in precipitation also increased the concentration of metals and metalloids in the water column and in biofilms, but the water diversion from damming reduced their contributions downstream. The maintenance of an adequate ecological flow in dam-impounded streams is encouraged to overcome these impacts in the current climate change context. More field studies are needed to assess how multiple anthropogenic stressors interact and threaten the ecosystem integrity in a realistic and applied context.
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