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Chironomid incorporation of methane‐derived carbon in plankton‐ and macrophyte‐dominated habitats in a large shallow lake

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dc.contributor.authorAgasild, Helen
dc.contributor.authorKisand, Anu
dc.contributor.authorAinelo, Epp
dc.contributor.authorFeldmann, Tõnu
dc.contributor.authorTimm, Henn
dc.contributor.authorKarus, Katrit
dc.contributor.authorKisand, Veljo
dc.contributor.authorJones, Roger I.
dc.contributor.authorNõges, Tiina
dc.contributor.departmentCentre for Limnology. Institute of Agricultural and Environmental Sciences. Estonian University of Life Scienceseng
dc.date.accessioned2022-10-10T06:44:27Z
dc.date.available2022-10-10T06:44:27Z
dc.date.issued2018
dc.description.abstract1. While 13 C-depleted carbon derived from biogenic methane can substantially contribute to the benthic secondary production in deep stratified lakes, its role in shallow lakes is less clear. We investigated the dynamics of δ13 C and δ15 N in the larvae of Chironomus plumosus throughout an annual cycle in two ecologically distinct basins (open-water plankton-dominated and sheltered macrophyte- covered) of a large (270 km2 ), shallow, polymictic and eutrophic lake (Võrtsjärv, Estonia, North Europe). The larval stable isotopic compositions were linked to the presence of methane-oxidising bacteria (MOB) in larval guts and sediments. 2. Molecular detection of MOB revealed their presence in various sediment types, but stable isotope (SI) analysis revealed clear differences in the feeding of chironomid larvae between the plankton- and macrophyte-dominated habitats. 3. In the plankton-dominated habitat, the mean δ13 C values of larvae remained relatively constant (−38.3‰ to −35.5‰) and corresponded closely to the sediment δ13 C values. Mean δ13 C values of chironomid larvae were generally lower in macrophyte-dominated habitats (−43.4‰ to −33.0‰), and both seasonal and individual variation in larval δ13 C values were more pronounced. MOB presence in larval guts proved a dietary contribution from biogenic methane in macrophyte-dominated habitats. Both the SI and molecular results indicated that MOB could help support larvae even during the cold temperature-limited and ice- covered periods. 4. Our study indicates that methane-derived carbon makes a low but steady contri- bution to the larval chironomids throughout an annual cycle in large shallow Võrtsjärv. However, this contribution can be substantially higher in the lake habitats with abundant macrophytes. The study provides further evidence that a carbon flow pathway from biogenic methane can contribute to the benthic food web under variable habitat conditions in a shallow polymictic lake.eng
dc.description.abstractFunding information: Estonian Research Council, Grant/Award Number: IUT 21-02, PUT 134, PUT 1389eng
dc.description.sponsorshipFunding information: Estonian Research Council, Grant/Award Number: IUT 21-02, PUT 134, PUT 1389eng
dc.identifier.issn1365-2427
dc.identifier.publicationFreshwater Biology. 2018;63:1433–1445.
dc.identifier.urihttp://hdl.handle.net/10492/7795
dc.identifier.urihttps://doi.org/10.1111/fwb.13170
dc.publisherWiley
dc.subjectbenthic food webeng
dc.subjectchironomid larvaeeng
dc.subjectmethanotrophic bacteriaeng
dc.subjectshallow lakeeng
dc.subjectstable isotopeseng
dc.subjectarticleseng
dc.titleChironomid incorporation of methane‐derived carbon in plankton‐ and macrophyte‐dominated habitats in a large shallow lakeeng
dc.typeArticleeng

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