Chironomid incorporation of methane‐derived carbon in plankton‐ and macrophyte‐dominated habitats in a large shallow lake
Laen...
Kuupäev
2018
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Wiley
Abstrakt
1. 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.
Funding information: Estonian Research Council, Grant/Award Number: IUT 21-02, PUT 134, PUT 1389
Funding information: Estonian Research Council, Grant/Award Number: IUT 21-02, PUT 134, PUT 1389
Kirjeldus
Märksõnad
benthic food web, chironomid larvae, methanotrophic bacteria, shallow lake, stable isotopes, articles