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Open Access Publications from the University of California

Warming alters food web-driven changes in the CO2flux of experimental pond ecosystems

  • Author(s): Atwood, TB
  • Hammill, E
  • Kratina, P
  • Greig, HS
  • Shurin, JB
  • Richardson, JS
  • et al.

© 2015 The Authors. Evidence shows the important role biota play in the carbon cycle, and strategic management of plant and animal populations could enhance CO2uptake in aquatic ecosystems. However, it is currently unknown how managementdriven changes to community structure may interact with climate warming and other anthropogenic perturbations to alter CO2fluxes. Here we showed that under ambient water temperatures, predators (three-spined stickleback) and nutrient enrichment synergistically increased primary producer biomass, resulting in increased CO2uptake by mesocosms in early dawn. However, a 38C increase in water temperatures counteracted positive effects of predators and nutrients, leading to reduced primary producer biomass and a switch from CO2influx to efflux. This confounding effect of temperature demonstrates that climate scenarios must be accounted for when undertaking ecosystem management actions to increase biosequestration.

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