Habitat type determines herbivory controls over CO2 fluxes in a warmer Arctic

Ecology
Sofie SjögerstenS J Woodin

Abstract

High-latitude ecosystems store large amounts of carbon (C); however, the C storage of these ecosystems is under threat from both climate warming and increased levels of herbivory. In this study we examined the combined role of herbivores and climate warming as drivers of CO2 fluxes in two typical high-latitude habitats (mesic heath and wet meadow). We hypothesized that both herbivory and climate warming would reduce the C sink strength of Arctic tundra through their combined effects on plant biomass and gross ecosystem photosynthesis and on decomposition rates and the abiotic environment. To test this hypothesis we employed experimental warming (via International Tundra Experiment [ITEX] chambers) and grazing (via captive Barnacle Geese) in a three-year factorial field experiment. Ecosystem CO2 fluxes (net ecosystem exchange of CO2, ecosystem respiration, and gross ecosystem photosynthesis) were measured in all treatments at varying intensity over the three growing seasons to capture the impact of the treatments on a range of temporal scales (diurnal, seasonal, and interannual). Grazing and warming treatments had markedly different effects on CO2 fluxes in the two tundra habitats. Grazing caused a strong reduction in CO2 assimi...Continue Reading

References

Apr 10, 2003·Oecologia·Brian T PersonChristopher A Babcock
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Citations

Jun 4, 2011·Biological Reviews of the Cambridge Philosophical Society·Andrew J Tanentzap, David A Coomes
Oct 9, 2018·Global Change Biology·A Joshua LefflerJeffrey M Welker
May 23, 2020·Nature Communications·Tarja SilfverJuha Mikola
Jan 1, 2011·Biogeochemistry·Sofie SjögerstenSarah J Woodin
May 17, 2018·Royal Society Open Science·Amanda M KoltzToke T Høye
Dec 14, 2018·Science·Oswald J SchmitzScott J Goetz
Oct 18, 2021·Ecological Applications : a Publication of the Ecological Society of America·Edward B RastetterNatalie T Boelman

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