title: Warming alters food web-driven changes in the CO2 flux of experimental pond ecosystems.
abstract: Evidence shows the important role biota play in the carbon cycle, and strategic management of plant and animal populations could enhance CO2 uptake in aquatic ecosystems. However, it is currently unknown how management-driven changes to community structure may interact with climate warming and other anthropogenic perturbations to alter CO2 fluxes. Here we showed that under ambient water temperatures, predators (three-spined stickleback) and nutrient enrichment synergistically increased primary producer biomass, resulting in increased CO2 uptake by mesocosms in early dawn. However, a 3°C increase in water temperatures counteracted positive effects of predators and nutrients, leading to reduced primary producer biomass and a switch from CO2 influx to efflux. This confounding effect of temperature demonstrates that climate scenarios must be accounted for when undertaking ecosystem management actions to increase biosequestration.
authors.affiliation: Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4 Department of Watershed Sciences and Ecology Center, Utah State University, Logan, UT 84322, USA trisha.atwood@usu.edu.
authors.forename: T B
authors.initials: TB
authors.lastname: Atwood
authors.affiliation: Department of Watershed Sciences and Ecology Center, Utah State University, Logan, UT 84322, USA.
authors.forename: E
authors.initials: E
authors.lastname: Hammill
authors.affiliation: School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK.
authors.forename: P
authors.initials: P
authors.lastname: Kratina
authors.affiliation: School of Biology and Ecology, University of Maine, Orono, ME 04469, USA.
authors.forename: H S
authors.initials: HS
authors.lastname: Greig
authors.affiliation: Section of Ecology, Behavior and Evolution, University of California-San Diego, La Jolla, CA 92093, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Shurin
authors.affiliation: Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4.
authors.forename: J S
authors.initials: JS
authors.lastname: Richardson
mesh_terms: D000818:Animals; D018533:Biomass; D002245:Carbon Dioxide / Q000378:metabolism*; D057231:Climate Change; D017753:Ecosystem; D005068:Eutrophication; D020387:Food Chain; D010944:Plants; D061005:Ponds / Q000737:chemistry*; D011235:Predatory Behavior; D023701:Smegmamorpha / Q000502:physiology; D013696:Temperature
chemical_list: D002245:Carbon Dioxide
keywords: biosequestration; carbon cycling; climate change; trophic cascades