Vegetation transitions drive the autotrophy-heterotrophy balance in Arctic lakes

McGowan, S., Anderson, N.J., Edwards, M.E., Hopla, E., Jones, V., Langdon, P.G., Law, A., Soloveiva, N., Turner, S., van Hardenbroek, M., Whiteford, E.J. ORCID: 0000-0002-2411-7591 and Wiik, E., 2018. Vegetation transitions drive the autotrophy-heterotrophy balance in Arctic lakes. Limnology and Oceanography Letters, 3 (3), pp. 246-255. ISSN 2378-2242

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Abstract

“Arctic greening” will alter vegetation quantity and quality in northern watersheds, with possible consequences for lake metabolic balance. We used paleolimnology from six Arctic lakes in Greenland, Norway, and Alaska to develop a conceptual model describing how climate-driven shifts in terrestrial vegetation (spanning herb to boreal forest) influence lake autotrophic biomass (as chlorophyll and carotenoid pigments). Major autotrophic transitions occurred, including (1) optimal production of siliceous algae and cyanobacteria/chlorophytes at intermediate vegetation cover (dwarf shrub and Betula; dissolved organic carbon (DOC) range of 2–4 mg L21 ), below and above which UVR exposure (DOC; < 2 mgL21 ) and light extinction (DOC; > 4 mgL21 ), respectively limit algal biomass, (2) an increase in potentially mixotrophic cryptophytes with higher forest cover and allochthonous carbon supply. Vegetation cover appears to influence lake autotrophs by changing influx of (colored) dissolved organic matter which has multiple interacting roles—as a photoprotectant—in light attenuation and in macronutrient (carbon, nitrogen) supply.

Item Type: Journal article
Publication Title: Limnology and Oceanography Letters
Creators: McGowan, S., Anderson, N.J., Edwards, M.E., Hopla, E., Jones, V., Langdon, P.G., Law, A., Soloveiva, N., Turner, S., van Hardenbroek, M., Whiteford, E.J. and Wiik, E.
Publisher: Wiley on behalf of the Association for the Sciences of Limnology and Oceanography
Date: 2018
Volume: 3
Number: 3
ISSN: 2378-2242
Identifiers:
NumberType
10.1002/lol2.10086DOI
Rights: © 2018 the author(s). Limnology and Oceanography Letters published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 27 Jul 2018 08:03
Last Modified: 27 Jul 2018 08:03
URI: http://irep.ntu.ac.uk/id/eprint/34184

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