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Piscivore stocking significantly suppresses small fish but does not facilitate a clear-water state in subtropical shallow mesocosms: A biomanipulation experiment

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  • Hu He, CAS - Nanjing Institute of Geography and Limnology
  • ,
  • Tian Qian, CAS - Nanjing Institute of Geography and Limnology
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  • Ruijie Shen, CAS - Nanjing Institute of Geography and Limnology
  • ,
  • Jinlei Yu, CAS - Nanjing Institute of Geography and Limnology
  • ,
  • Kuanyi Li, CAS - Nanjing Institute of Geography and Limnology, University of Chinese Academy of Sciences
  • ,
  • Zhengwen Liu, CAS - Nanjing Institute of Geography and Limnology, University of Chinese Academy of Sciences, Jinan University
  • ,
  • Erik Jeppesen

Biomanipulation by piscivore stocking has been widely used to combat eutrophication in north temperate lakes, but its applicability in warm lakes has not yet been well elucidated. Here, we used experimental mesocosms to test the effects of a native benthi-piscivore (snakehead, Channa argus Cantor) on water clarity under subtropical conditions where small omni-benthivorous fish like crucian carp (Carassius carassius L.) prevail. Our results showed that, despite of a great reduction of crucian carp biomass, snakehead stocking did not create a strong trophic cascade as neither (herbivorous) zooplankton biomass nor their grazing pressure, indicated by biomass ratio of (herbivorous) zooplankton to phytoplankton, changed significantly. Moreover, snakehead stocking significantly increased water non-algal turbidity as well as nutrient and chlorophyll-a concentrations, suggesting that these benthi-piscivores also disturbed sediments like crucian carp did. Our study showed that biomanipulation by stocking of snakehead does not facilitate clear-water state in warm shallow lakes, even on the short-term.

OriginalsprogEngelsk
Artikelnummer156967
TidsskriftScience of the total Environment
Vol/bind842
ISSN0048-9697
DOI
StatusUdgivet - okt. 2022

Bibliografisk note

Funding Information:
This study was financially supported by National Science Foundation of China (Nos. 31930074 ; 31971473 ) and Chinese National Key Research and Development Project ( 2017YFA0605201 ). EJ was supported by AQUACOSM (Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean), AnaEE Denmark (anaee.dk), and the Tübitak program BIDEB 2232 (project 118C250 ).

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