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Do warming and humic river runoff alter the metabolic balance of lake ecosystems?
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2016 (English)In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 78, no 4, 717-725 p.Article in journal (Refereed) Published
Abstract [en]

Global warming is expected to influence lake gross primary production (GPP) and ecosystem respiration (R) by increasing water temperature and terrestrial export of organic material and inorganic nutrients from the catchment. We experimentally tested the effects of warming (3 A degrees C) and natural humic river runoff, separately and in combination, on habitat-specific and whole ecosystem net ecosystem production (NEP = GPP - R) in replicated large scale (136 m(3)) experimental pond ecosystems over one open water season. Pelagic NEP was reduced by warming and increased with humic river water addition. Littoral NEP (benthos, macrophytes, periphyton) showed an opposite pattern with increasing NEP following warming and decreasing NEP following humic river water addition. These changes were a result of changes in GPP with warming (negative in pelagic, positive in littoral) and with humic water addition (positive in pelagic, negative in littoral), while no effects were observed on pelagic respiration. As a result of the counteracting effects on NEP in pelagic and littoral habitats, whole ecosystem NEP was not affected by the treatments. The study suggests that climate mediated changes in temperature and river runoff have relatively small effects on the overall metabolic balance of shallow aquatic ecosystems but there may be large habitat-specific effects.

Place, publisher, year, edition, pages
2016. Vol. 78, no 4, 717-725 p.
Keyword [en]
Warming, Humic river runoff, Pelagic habitat, Littoral habitat, Whole ecosystem metabolism, LGIORGIO PA, 1994, LIMNOLOGY AND OCEANOGRAPHY, V39, P772 Connor Mary I., 2009, PLOS BIOLOGY, V7, nsson Mats, 2008, ECOSYSTEMS, V11, P367 deboncoeur Y, 2001, ECOLOGY, V82, P1065 rpenter SR, 1998, ECOLOGICAL APPLICATIONS, V8, P559 colle Alice, 2012, FRESHWATER BIOLOGY, V57, P684 le JJ, 1998, LIMNOLOGY AND OCEANOGRAPHY, V43, P647 rk JTO, 2011, Light and photosynthesis in aquatic ecosystems, k Jenny, 2012, GLOBAL BIOGEOCHEMICAL CYCLES, V26
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-126292DOI: 10.1007/s00027-015-0463-yISI: 000382681000008OAI: oai:DiVA.org:umu-126292DiVA: diva2:1045003
Available from: 2016-11-08 Created: 2016-10-03 Last updated: 2016-11-08Bibliographically approved

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Rodriguez, PatriciaByström, PärGeibrink, ErikHedström, PerVasconcelos, Francisco RiveraKarlsson, Jan
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