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          Institute: MPI für Evolutionsbiologie     Collection: Ecophysiology     Display Documents



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ID: 173917.0, MPI für Evolutionsbiologie / Ecophysiology
Stable isotope analysis provides fresh insights into dietary separation between Chironomus anthracinus and C. plumosus
Authors:Kelly, Andrew; Jones, R. I.; Grey, J.
Language:English
Date of Publication (YYYY-MM-DD):2004-06
Title of Journal:Journal of the North American Benthological Society
Journal Abbrev.:J. N. Am. Benthol. Soc.
Volume:23
Issue / Number:2
Start Page:287
End Page:296
Review Status:not specified
Audience:Not Specified
Abstract / Description:We used stable isotope analysis to investigate dietary differences between 2 sympatric species of tubicolous chironomid larvae, Chironomus plumosus and C. anthracinus, from the profundal sediments of 6 eutrophic lakes in the UK and Germany. We found striking variation between lakes in both δ¹³C (-29.8 to -56.3‰) and δ¹⁵N (-7.8 to 14.7‰) in the 2 chironomid species. Moreover, C. plumosus was consistently depleted in both ¹³C and ¹⁵N relative to C. anthracinus. Our data support previous reports of interspecific dietary variations between the 2 species, which suggest niche separation partly on the basis of diet. However, reported differences in the feeding modes of the 2 species could not explain the extreme ¹³C- and ¹⁵N-depletion observed in chironomid larvae from several of the lakes. We suggest that the low δ¹³C signatures result from the ingestion of methanotrophic bacteria and subsequent incorporation of biogenic methane-derived C. Further, the chironomid larvae enhance methanotrophic activity via bioturbation of the surrounding sediment. Significant isotope differences between the 2 species may result from their variable tube morphologies or physiology.
Free Keywords:stable isotopes; chironomid larvae; interspecific variation; methane; bacteria; lakes
External Publication Status:published
Document Type:Article
Affiliations:MPI für Limnologie/Abt. Ökophysiologie
External Affiliations:Department of Biological Sciences, Lancaster University, Lancaster LA1 4YQ, UK
Identifiers:ISSN:0887-3593 [ID-No:1]
LOCALID:2284/S 38159 [Listen-Nummer/S-Nummer]
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