Responses of primary producers in shallow lakes to elevated temperature: a mesocosm experiment during the growing season of Potamogeton crispus

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  • Beibei Hao, Chinese Acad Sci, Wuhan Botanical Garden, CAS, Chinese Academy of Sciences, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Univ Chinese Acad Sci, Chinese Academy of Sciences, University of Chinese Academy of Sciences, CAS, Sino Danish Ctr Educ & Res
  • ,
  • Anna Fabrin Roejkjaer
  • ,
  • Haoping Wu, Chinese Acad Sci, Wuhan Botanical Garden, CAS, Chinese Academy of Sciences, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden
  • ,
  • Yu Cao, Chinese Acad Sci, Chinese Academy of Sciences, Wuhan Botanical Garden, CAS, Wuhan Bot Garden, Hubei Key Lab Wetland Evolut & Ecol Restorat
  • ,
  • Erik Jeppesen
  • Wei Li, Chinese Acad Sci, Chinese Academy of Sciences, Wuhan Botanical Garden, CAS, Wuhan Bot Garden, Hubei Key Lab Wetland Evolut & Ecol Restorat

Climate warming may influence the relationship among macrophyte-periphyton-phytoplankton and change the producer community structure in shallow lakes, as elevated temperature has been suggested to promote the dominance of phytoplankton. We performed a 5-month experiment (starting in winter, December) to elucidate the responses of three phototrophic communities (macrophyte-Potamogeton crispus, periphyton, phytoplankton) and their interactions to elevated temperature (4.5 A degrees C) under eutrophic, subtropical conditions. The biomass and composition of periphyton were not significantly affected by increased temperature, while the biomass of phytoplankton increased with a shift in phytoplankton composition towards higher dominance of chlorophytes and cyanobacteria. Warming also reduced the survival of P. crispus and accelerated the decline of P. crispus. At both ambient and heated temperatures, a shift occurred at the end of the experiment from a clear-state dominated by P. crispus to a clear-state dominated by filamentous algae and warming facilitated this shift. Our results thus indicated that, when submerged macrophytes diminished or disappeared, filamentous algae exhibited functional compensation that maintained low phytoplankton development, primarily at elevated temperatures.

Original languageEnglish
Article number34
JournalAquatic Sciences
Volume80
Issue4
Number of pages10
ISSN1015-1621
DOIs
Publication statusPublished - Oct 2018

    Research areas

  • Climate warming, Periphyton, Phytoplankton, Filamentous algae, Primary producers, NORTH-ATLANTIC OSCILLATION, GLOBAL CLIMATE-CHANGE, SUBMERGED MACROPHYTES, PLANKTON DYNAMICS, HEAT-STRESS, PHYTOPLANKTON, GROWTH, COMMUNITIES, PERIPHYTON, NITROGEN

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