Increasing drying changes the relationship between biodiversity and ecosystem multifunctionality

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Abstract
Increased drying of rivers under global climate change is leading to biodiversity loss. However, it is not clear whether biodiversity loss affects river functions. In this study, we investigated the changes in biofilm community diversity and functions in an artificial stream after different drying durations. A critical drying duration of around 60 days was found in the microbial composition and functions. Therefore, different drying durations can be divided into short-term drying (~0–20 days) and long-term drying (~60–130 days) to analyse the effect of biodiversity in terms of ecosystem functions. In summary, the dominant relationship of biodiversity on community stability got uncoupled after long-term drying. Community assembly became dominant in maintaining multifunctionality with increasing drying duration rather than biodiversity as traditionally perceived. This study reveals the importance of community assembly, extending theoretical knowledge of the relationship between biodiversity and ecosystem multifunctionality.
Funding Information
  • Fundamental Research Funds for the Central Universities (B240205016)
  • Graduate Research and Innovation Projects of Jiangsu Province (KYCX24_0902)
  • Excellent Young Team Program for Central Universities (Environmental Risks and Decontamination Technology of Emerging contaminants in Rivers and Lakes)
  • Open Fund of the State Key Laboratory of Hydraulics and Mountain River Engineering of Sichuan University (SKHL2109)
  • National Natural Science Foundation of China (No. 52379063)
  • Key Research and Development Project of Tibet Autonomous Region Science and Technology Department (XZ202101ZY0016G)

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