4.7 Article

Elevated temperature and toxic Microcystis reduce Daphnia fitness and modulate gut microbiota

Journal

ENVIRONMENTAL POLLUTION
Volume 271, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.116409

Keywords

Daphnia; Gut microbiota; Life history parameters; Microcystis; Multiple stressors

Funding

  1. National Natural Science Foundation of China [31730105, 31800385]
  2. China Postdoctoral Science Foundation [2020M681658]
  3. Priority Academic Program Development of Jiangsu Higher Education Institutions of China

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This study investigated the responses of Daphnia magna gut microbiota to the combined effects of toxic Microcystis aeruginosa and high temperature, and found that they had synergistically negative effects on D. magna performance due to altered gut microbiota. Under good food regime, temperature had no effect on the composition of the gut microbiota; high abundance of symbiotic Comamonadaceae and good food increased D. magna fitness.
The gut microbiota has been increasingly recognized to regulate host fitness, which in turn is dependent on stability of community structure and composition. Many biotic and abiotic factors have been demonstrated to shape gut microbiota of cladocerans. However, the interactive effects of these variables on cladocerans fitness due to alteration of gut microbiota and their linkage with life history parameters are poorly understood. Here, we investigated the responses of Daphnia magna gut microbiota to the combined effects of toxic Microcystis aeruginosa and high temperature and its associations with fitness. We found that under good food regime, the temperature has no effect on the composition of the gut microbiota, whereas under high proportion of toxic M. aeruginosa and high temperature conditions, D. magna lost their symbionts. High proportion of toxic M. aeruginosa and high temperature had synergistically negative effects on D. magna performance due to altered gut microbiota. The high abundance of symbiotic Comamonadaceae and good food increased D. magna fitness. The present study illustrates that understanding life history strategies in response to multiple stressors related to changes in the gut microbiota diversity and composition requires integrated approaches that incorporate multiple linked traits and tether them to one another. (C) 2020 Elsevier Ltd. All rights reserved.

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