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Microbial network complexity drives non-linear shift in biodiversity-nutrient cycling in a saline urban reservoir

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  • Yuanyuan Mo, Chinese Academy of Sciences, University of Chinese Academy of Sciences
  • ,
  • Feng Peng, Chinese Academy of Sciences
  • ,
  • Erik Jeppesen
  • Lars Gamfeldt, University of Gothenburg
  • ,
  • Peng Xiao, Chinese Academy of Sciences
  • ,
  • Mamun Abdullah Al, Chinese Academy of Sciences, University of Chinese Academy of Sciences
  • ,
  • Jun Yang, Chinese Academy of Sciences

Aquatic biodiversity is important in mediating ecosystem functioning, contributing to ecosystem sustainability and human wellbeing. However, how microbial network complexity affects the biodiversity-nutrient cycling relationship in saline freshwater ecosystems remains underexplored. Using high-resolution time-series data, we examined the relationships between microeukaryotic-bacterial community network complexity, biodiversity and multi-nutrient cycling in an urban reservoir undergoing a freshwater salinization-desalinization cycle. We found that low microbial diversity enhanced ecosystem multi-nutrient cycling under high salinity stress. In addition, multi-nutrient cycling declined with increased network complexity. Further, we found a non-linear relationship between salinity-induced shifts in the complexity of the microbial network and biodiversity-nutrient cycling (BNC) relationship of keystone taxa, i.e. the strength of the BNC relationship first became weak and then strong with increased network complexity. Together, these results highlighted the significant insight that there is not always positive relationship between biodiversity/network complexity and multi-nutrient cycling, even between network complexity and BNC relationship in real-world ecosystems, suggesting that preserving microbial association is important in aquatic health managing and evaluating the freshwater salinization problem.

OriginalsprogEngelsk
Artikelnummer158011
TidsskriftScience of the total Environment
Vol/bind850
ISSN0048-9697
DOI
StatusUdgivet - dec. 2022

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