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Different carbon support for community respiration and secondary production in unproductive lakes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2007 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 116, no 10, 1691-1696 p.Article in journal (Refereed) Published
Abstract [en]

This study investigates the allocation of allochthonous organic carbon (AlloOC) to pelagic respiration and biomass production in unproductive lakes. Metabolic process rates and stable isotopic composition (delta C-13) of crustacean zooplankton and respired CO2 were measured in the epilimnion of 13 forest lakes in northern Sweden. The delta C-13 of zooplankton was low (-31.2 to -38.0 parts per thousand) compared to that of respired CO2 (-28.4 to -30.6 parts per thousand), implying that the relative importance of AlloOC was lower for zooplankton (ca 40%) than for respiration (ca 80%). Combining delta C-13 and carbon flux data revealed that a large amount of metabolized AlloOC was lost in respiration, compared to the amount transferred to zooplankton (< 3%). Thus, despite large respiratory losses, AlloOC was still important for zooplankton growth, implying a high supply of AlloOC in comparison to phytoplankton generated organic carbon in the lakes.

Place, publisher, year, edition, pages
Oxford: Blackwell Publishing, 2007. Vol. 116, no 10, 1691-1696 p.
Keyword [en]
dissolved organic carbon, stable-isotope analysis, food webs, phytoplankton production, bacterial metabolism, growth efficiency, Northern Sweden, humic lakes, zooplankton, matter
National Category
Environmental Sciences Ecology
URN: urn:nbn:se:umu:diva-6201DOI: 10.1111/j.2007.0030-1299.15825.xISI: 000249493100010OAI: diva2:145869
Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2016-04-18Bibliographically approved

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