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Effects of Terrestrial Organic Matter on Aquatic Primary Production as Mediated by Pelagic-Benthic Resource Fluxes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (EcoChange)ORCID iD: 0000-0002-2327-9716
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. Austral Centre for Scientific Research (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2018 (English)In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 21, no 6, p. 1255-1268Article in journal (Refereed) Published
Abstract [en]

Flows of energy and matter across habitat boundaries can be major determinants of the functioning of recipient ecosystems. It is currently debated whether terrestrial dissolved organic matter (tDOM) is a resource subsidy or a resource subtraction in recipient lakes. We present data from a long-term field experiment in which pelagic phosphorus concentration and whole-ecosystem primary production increased with increasing tDOM input, suggesting that tDOM acted primarily as a direct nutrient subsidy. Piecewise structural equation modeling supports, however, a substantial contribution of a second mechanism: colored tDOM acted also as a resource subtraction by shading benthic algae, preventing them from intercepting nutrients released across the sediment-water interface. Inhibition of benthic algae by colored tDOM thus indirectly promoted pelagic algae and whole-ecosystem primary production. We conclude that cross-ecosystem terrestrial DOM inputs can modify light and nutrient flows between aquatic habitats and alter the relative contributions of benthic and pelagic habitats to total primary production. These results are particularly relevant for shallow northern lakes, which are projected to receive increased tDOM runoff.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 21, no 6, p. 1255-1268
Keywords [en]
spatial subsidy, allochthonous input, dissolved organic matter, resource competition, nutrients, light, pelagic, benthic, warming, brownification, piecewise SEM
National Category
Ecology Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-152268DOI: 10.1007/s10021-017-0217-xISI: 000444384400013OAI: oai:DiVA.org:umu-152268DiVA, id: diva2:1252586
Funder
Knut and Alice Wallenberg FoundationThe Kempe FoundationsSwedish Research Council, 621-2011-3908Swedish Research Council, 621-2014-5238Available from: 2018-10-02 Created: 2018-10-02 Last updated: 2019-01-23Bibliographically approved

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Vasconcelos, Rivera FranciscoDiehl, SebastianRodríguez, PatriciaKarlsson, JanByström, Pär

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