Effect of temperature on methane dynamics and evaluation of methane oxidation kinetics in shallow Arctic Alaskan lakes
- 1k Downloads
Large uncertainties exist regarding the influence of ongoing climate change to microbially mediated methane cycling in arctic lakes. Specifically, the coupled response of methanogenesis (MG) and methane oxidation (Mox) to increased temperature is poorly understood. Therefore, the effect of temperature on rates of sediment MG and water column Mox in two shallow Arctic Alaskan lakes were evaluated in 2010. To understand the capacity of Mox to offset potential increases in dissolved methane concentrations, kinetics of water column Mox were also determined. Rates of MG responded positively to increased temperature with a greater influence exerted at higher incubation temperatures. Substrate-saturated Mox significantly increased with temperature and was controlled by substrate and temperature interactions. In contrast, substrate-limited Mox was not influenced by temperature and was controlled by substrate supply. Analysis of Mox kinetics pointed to a community of water column dwelling methane oxidizing bacteria that are capable of oxidizing dissolved methane concentrations far in excess of observed levels. Assuming no diffusion limitation, our results suggest that Mox will likely offset increased MG in response to elevated temperature regimes as a function of ongoing climate change.
KeywordsMethane Shallow lakes Methanogenesis Methane oxidation Arctic Alaska Climate change
We would like to thank Gabe McGowan and Kristen Bretz for field and lab assistance as well as the Toolik Field Station Staff for logistical support. This work was funded by NSF Grants 0807094 and 0516043. We would also like to thank two anonymous reviewers for their valuable input that improved this manuscript.
- Axford, Y., J. P. Briner, C. A. Cooke, D. R. Francis, N. Michelutti, G. H. Miller, J. P. Smol, E. K. Thomas, C. R. Wilson & A. P. Wolfe, 2009. Recent changes in a remote Arctic lake are unique within the past 200,000 years. Proceedings of the National Academy of Sciences 106(44): 18443–18446.CrossRefGoogle Scholar
- Bastviken D., J. Cole, M. Pace & L. Tranvik, 2004. Methane emissions from lakes: dependence of lake characteristics, two regional assessments, and a global estimate. Global Biogeochemical Cycles 18(4). doi: 10.1029/2004GB002238.
- Bowden, W. B., M. N. Gooseff, A. Balser, A. Green, B. J. Peterson & J. Bradford, 2008. Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope. Potential impacts on headwater stream ecosystems, Alaska.Google Scholar
- Carroll, M. L., J .R. G. Townshend, C. M. DiMiceli, T. Loboda & R. A. Sohlberg, 2011. Shrinking lakes of the Arctic: spatial relationships and trajectory of change. Geophysical Research Letters. doi: 10.1029/2011GL049427.
- Casper, P., 1996. Methane production in littoral and profundal sediments of an oligotrophic and a eutrophic lake. Archiv fur Hydrobiologie: Special Issues in Advanced Limnology 48: 253–259.Google Scholar
- Dlugokencky, E. J., L. Bruhwiler, J. W. C. White, L. K. Emmons, P. C. Novelli, S. A. Montzka, K. A. Masarie, P. M. Lang, A. M. Crotwell, J. B. Miller & L. V. Gatti, 2009. Observational constraints on recent increases in the atmospheric burden. Geophysical Research Letters 36: L18803. doi: 10.1029/2009GL039780.CrossRefGoogle Scholar
- Hamilton, T. D, 2003. Glacial geology of the Toolik Lake and Upper Kuparuk River region, University of Alaska Fairbanks, Institute of Arctic Biology, Biological Papers of the University of Alaska, Fairbanks, Alaska.Google Scholar
- Isaksen I. S. A., M. Gauss, G. Myhre, K. M. Walter Antony & C. Ruppel, 2011. Strong atmospheric chemistry feedback to climate warming from Arctic methane emissions. Global Biogeochemical Cycles 25: GB2002. doi: 10.1029/2010GB003845.
- Karllson, J., R. R. Christensen, P. Crill, J. Forster, D. Hammarlund, M. Jackowicz-Korczynski, U. Kokfelt, C. Roehm & P. Rosen, 2010. Quantifying the relative importance of lake emissions in the carbon budget of a subarctic catchment. Journal of Geophysical Research 115: G03006. doi: 10.1029/2010JG001305.Google Scholar
- Kling, G. W, 1995. Land-water linkages: the influence of terrestrial diversity on aquatic systems. 297–310. In Chapin, F. S. & Korner C. (eds), The Role of Biodiversity in Arctic and Alpine Tundra Ecosystems. Springer, Berlin: 320 pp.Google Scholar
- Lehninger A., 2000. Principles of Biochemistry, 3rd edn by Nelson D. L. & M. M. Cox (eds) Worth Publishers, New York.Google Scholar
- Liikanen, A., J. T. Huttunen, K. Valli & P. J. Martikainen, 2002. Methane cycling in the sediment and water column of mid-boreal hyper-eutrophic Lake Kevaton, Finland. Archiv Fur Hydrobiologie 154(4): 585–603.Google Scholar
- Nusslein, B. & R. Conrad, 2000. Methane production in eutrophic Lake Plubsee: seasonal change, temperature effect and metabolic processes in the profundal sediment. Archiv fur Hydrobiologie 149(4): 597–623.Google Scholar
- Post, E., M. C. Forchhammer, M. S. Bret-Harte, T. V. Callaghan, T. R. Christensen, B. Elberling, A. D. Fox, O. Gilg, D. S. Hik, T. T. Hoye, R. A. Ims, E. Jeppesen, D. R. Klein, J. Madsen, A. D. McGuire, S. Rysgaard, D. E. Schindler, I. Stirling, M. P. Tamstorf, N. J. C. Tyler, R. van der Wal, J. Welker, P. A. Wookey, N. M. Schmidt & P. Aastrup, 2009. Ecological dynamics across the Arctic associated with recent climate change. Science 325: 1355–1358.PubMedCrossRefGoogle Scholar
- Rudd, J. W. & R. D. Hamilton, 1975. Factors controlling rates of methane oxidation and the distribution of the methane oxidizers in a small stratified lake. Archiv fur Hydrobiologie 75: 522–538.Google Scholar
- Sokal, R. R. & F. J. Rohlf, 1995. Biometry, 3rd ed. W.H. Freeman and Company, New York.Google Scholar
- Stumm, W. & J.J. Morgan. 1996, Aquatic Chemistry: Chemical Equilibria and Rates in Natural Waters. Wiley, New York: 1022 pp.Google Scholar
- Wetzel, R. G., 2001. Limnology: lake and river ecosystems, 3rd ed. Academic Press, New York.Google Scholar
- Zar, J. H., 1996. Biostatistical Analysis, 3rd ed. Prentice Hall, Inc., Upper Saddle River, NJ.Google Scholar
- Zinder, S. H., 1993. Physiological Ecology of Methanogens. In Ferry, J. G. (ed.), MG: Ecology Biochemistry Physiology and Genetics. Chapman and Hall, New York, NY: 129–206.Google Scholar