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Assessing environmental attributes and effects of climate change on Sphagnum peatland distributions in North America using single- and multi-species models

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  • Tobi A Oke
  • Heather A Hager

Abstract

The fate of Northern peatlands under climate change is important because of their contribution to global carbon (C) storage. Peatlands are maintained via greater plant productivity (especially of Sphagnum species) than decomposition, and the processes involved are strongly mediated by climate. Although some studies predict that warming will relax constraints on decomposition, leading to decreased C sequestration, others predict increases in productivity and thus increases in C sequestration. We explored the lack of congruence between these predictions using single-species and integrated species distribution models as proxies for understanding the environmental correlates of North American Sphagnum peatland occurrence and how projected changes to the environment might influence these peatlands under climate change. Using Maximum entropy and BIOMOD modelling platforms, we generated single and integrated species distribution models for four common Sphagnum species in North America under current climate and a 2050 climate scenario projected by three general circulation models. We evaluated the environmental correlates of the models and explored the disparities in niche breadth, niche overlap, and climate suitability among current and future models. The models consistently show that Sphagnum peatland distribution is influenced by the balance between soil moisture deficit and temperature of the driest quarter-year. The models identify the east and west coasts of North America as the core climate space for Sphagnum peatland distribution. The models show that, at least in the immediate future, the area of suitable climate for Sphagnum peatland could expand. This result suggests that projected warming would be balanced effectively by the anticipated increase in precipitation, which would increase Sphagnum productivity.

Suggested Citation

  • Tobi A Oke & Heather A Hager, 2017. "Assessing environmental attributes and effects of climate change on Sphagnum peatland distributions in North America using single- and multi-species models," PLOS ONE, Public Library of Science, vol. 12(4), pages 1-16, April.
  • Handle: RePEc:plo:pone00:0175978
    DOI: 10.1371/journal.pone.0175978
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    References listed on IDEAS

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    1. Ellen Dorrepaal & Sylvia Toet & Richard S. P. van Logtestijn & Elferra Swart & Martine J. van de Weg & Terry V. Callaghan & Rien Aerts, 2009. "Carbon respiration from subsurface peat accelerated by climate warming in the subarctic," Nature, Nature, vol. 460(7255), pages 616-619, July.
    2. Heather A Hager & Sarah E Sinasac & Ze’ev Gedalof & Jonathan A Newman, 2014. "Predicting Potential Global Distributions of Two Miscanthus Grasses: Implications for Horticulture, Biofuel Production, and Biological Invasions," PLOS ONE, Public Library of Science, vol. 9(6), pages 1-14, June.
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