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ID: 366738.0, MPI für Evolutionsbiologie / Ecophysiology
Widespread contribution of methane-cycle bacteria to the diets of lake profundal chironomid larvae
Authors:Jones, Roger I.; Carter, Clare E.; Kelly, Andrew; Ward, Susan; Kelly, David J.; Grey, Jonathan
Date of Publication (YYYY-MM-DD):2008-03
Title of Journal:Ecology
Issue / Number:3
Start Page:857
End Page:864
Review Status:not specified
Audience:Not Specified
Abstract / Description:Reports of unexpectedly C-13-depleted chironomid larvae in lakes have led to an hypothesis that significant transfer of detrital organic matter to chironomid larvae may occur via methane-cycle bacteria. However, to date little is known of how such transfer might vary across species and lakes. We gathered data from 87 lakes to determine how widespread this phenomenon might be and to de. ne boundaries for its likely magnitude. Carbon stable isotope values of chironomid larvae varied greatly between taxa. Very marked C-13-depletion was evident only in certain taxa, especially Chironomus plumosus, C. anthracinus, and C. tenuistylus, all characteristic of eutrophic or dystrophic lakes and known to be tolerant of low oxygen conditions. Furthermore, marked C-13-depletion was only found in larvae from lakes in which late-summer hypolimnetic oxygen depletion near the sediment surface was below an apparent threshold concentration of 2-4 mg O-2/L. Similarly, application of a two-source mixing model suggested that methanotrophic bacteria made the greatest contribution to profundal chironomid growth ( 0 - 70% of larval carbon) when the late-summer oxygen concentration dropped below similar to 2 mg O-2/L. Our study demonstrates that methane-derived carbon is an important, but often neglected, contribution to the flux of carbon through the food webs of many productive or dystrophic lakes.
Free Keywords:Chironomids; Chironomus anthracinus; Chironomus plumosus; Chironomus tenuistylus; detritus; feeding; lake food webs; methane; methanotrophic bacteria; oxygen concentration; stable isotopes
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Ökophysiologie
External Affiliations:Univ Jyväskylä, Dept Biol & environm Sci, PL35, FIN-40014 Jyväskylä, Finland; Univ Ulster, Coleraine BT52 1SA, Londonderry North Ireland; Univ Lancaster, Dept Biol Sci, Lancaster LA1 4YQ, England; Natl Inst Water & Atmospher Res, Christchurch, New Zealand; Univ London Queen Mary Coll, Sch Biol & Chem Sci, London E1 4NS, England
Identifiers:ISSN:0012-9658 [ID-No:1]
LOCALID:2612/S 38784 [Listen-Nummer/S-Nummer]
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