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Invasive and toxic cyanobacteria regulate allochthonous resource use and community niche width of reservoir zooplankton

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  • Xiaofei Gao, Chinese Academy of Sciences, Henan Normal University
  • ,
  • Wenping Wang, Chinese Academy of Sciences, University of Chinese Academy of Sciences
  • ,
  • Jean Claude Ndayishimiye, Chinese Academy of Sciences, Shenzhen MSU-BIT University
  • ,
  • Lynn Govaert, Leibniz-Institute of Freshwater Ecology and Inland Fisheries
  • ,
  • Huihuang Chen, Chinese Academy of Sciences, University of Chinese Academy of Sciences
  • ,
  • Erik Jeppesen
  • Yuanyuan Xue, Chinese Academy of Sciences
  • ,
  • Xiaoqing Yu, Chinese Academy of Sciences
  • ,
  • Jun Yang, Chinese Academy of Sciences

Cyanobacterial dominance or blooms can influence ecosystem structure in reservoirs, yet there are only few studies of its effect on the resource use and trophic structure of zooplankton. We hypothesised that zooplankton traits would exhibit a strong response to the increase of invasive and toxic cyanobacteria. We investigated the effect of an invasive bloom-forming cyanobacterium Raphidiopsis raciborskii (formerly Cylindrospermopsis raciborskii) on zooplankton functional traits (e.g., growth, reproduction, allochthonous resource use and realised niche) through laboratory experiments and 3-year field investigations in two subtropical reservoirs. The realised niche (i.e., resource and habitat use) was quantified using stable isotopes (termed isotopic niches). We fed the cladoceran zooplankton Moina sp. with Scenedesmus obliquus (chlorophyte), R. raciborskii, and a mixture of S. obliquus and R. raciborskii in laboratory experiments. A diet of R. raciborskii alone depressed the growth and reproduction of Moina sp. compared to a diet of S. obliquus alone, but a mixture of S. obliquus and R. raciborskii greatly alleviated the inhibition effects caused by cyanobacteria. Under natural field conditions, we did not find a strong inhibition effect of R. raciborskii dominance on the zooplankton, but a high biomass of R. raciborskii was associated with an increase (17%) in the relative allochthonous resource (terrestrially derived organic matter) use by cladocerans (but not for copepods), even though the chlorophyll-a concentration increased from 17 μg/L in the non-bloom period to 28 μg/L during periods of R. raciborskii dominance or blooms. Furthermore, a high biomass of R. raciborskii increased the contribution of inter-taxa variation (taxa sorting) to the expanded isotopic niches of the zooplankton community. Our study helps to clarify cyanobacteria-zooplankton interactions and highlights the importance of cyanobacterial dominance or blooms in regulating cross-ecosystem resource use and biogeochemical cycling mediated by zooplankton in aquatic ecosystems.

TidsskriftFreshwater Biology
Sider (fra-til)1344-1356
Antal sider13
StatusUdgivet - aug. 2022

Bibliografisk note

Funding Information:
The work was funded by the National Natural Science Foundation of China (91851104, 32001152, 92047204 and 41703074), the National Key Research and Development Program of China (2017YFA0605203), and the Natural Science Foundation of Fujian Province of China (2019J02016). Erik Jeppesen was supported by the TÜBITAK program BIDEB2232 (Project 118C250).

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

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