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A regime shift from...
A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake
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Brothers, Soren M (författare)
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Hilt, Sabine (författare)
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Attermeyer, Katrin (författare)
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Grossart, Hans Peter (författare)
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Kosten, Sarian (författare)
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Lischke, Betty (författare)
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Mehner, Thomas (författare)
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Meyer, Nils (författare)
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- Scharnweber, Kristin, 1983- (författare)
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin
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Köhler, Jan (författare)
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(creator_code:org_t)
- 2013
- 2013
- Engelska.
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Ingår i: Ecosphere. - 2150-8925 .- 2150-8925. ; 4:11
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Ecological regime shifts and carbon cycling in aquatic systems have both been subject to increasing attention in recent years, yet the direct connection between these topics has remained poorly understood. A four-fold increase in sedimentation rates was observed within the past 50 years in a shallow eutrophic lake with no surface in- or outflows. This change coincided with an ecological regime shift involving the complete loss of submerged macrophytes, leading to a more turbid, phytoplankton-dominated state. To determine whether the increase in carbon (C) burial resulted from a comprehensive transformation of C cycling pathways in parallel to this regime shift, we compared the annual C balances (mass balance and ecosystem budget) of this turbid lake to a similar nearby lake with submerged macrophytes, a higher transparency, and similar nutrient concentrations. C balances indicated that roughly 80% of the C input was permanently buried in the turbid lake sediments, compared to 40% in the clearer macrophyte-dominated lake. This was due to a higher measured C burial efficiency in the turbid lake, which could be explained by lower benthic C mineralization rates. These lower mineralization rates were associated with a decrease in benthic oxygen availability coinciding with the loss of submerged macrophytes. In contrast to previous assumptions that a regime shift to phytoplankton dominance decreases lake heterotrophy by boosting whole-lake primary production, our results suggest that an equivalent net metabolic shift may also result from lower C mineralization rates in a shallow, turbid lake. The widespread occurrence of such shifts may thus fundamentally alter the role of shallow lakes in the global C cycle, away from channeling terrestrial C to the atmosphere and towards burying an increasing amount of C.
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- Av författaren/redakt...
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Brothers, Soren ...
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Hilt, Sabine
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Attermeyer, Katr ...
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Grossart, Hans P ...
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Kosten, Sarian
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Lischke, Betty
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visa fler...
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Mehner, Thomas
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Meyer, Nils
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Scharnweber, Kri ...
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Köhler, Jan
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visa färre...
- Artiklar i publikationen
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Ecosphere
- Av lärosätet
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Uppsala universitet