Carbon dynamics in highly heterotrophic subarctic thaw ponds
Roiha, T., Laurion, I., & Rautio, M. (2015). Carbon dynamics in highly heterotrophic subarctic thaw ponds. Biogeosciences, 12(23), 7223-7237. https://doi.org/10.5194/bg-12-7223-2015
Julkaistu sarjassa
BiogeosciencesPäivämäärä
2015Tekijänoikeudet
© Author(s) 2015. This is an open access article distributed under the CC Attribution 3.0 License.
Global warming has accelerated the formation of
permafrost thaw ponds in several subarctic and arctic regions.
These ponds are net heterotrophic as evidenced by
their greenhouse gas (GHG) supersaturation levels (CO2
and CH4), and generally receive large terrestrial carbon inputs
from the thawing and eroding permafrost. We measured
seasonal and vertical variations in the concentration
and type of dissolved organic matter (DOM) in five subarctic
thaw (thermokarst) ponds in northern Quebec, and explored
how environmental gradients influenced heterotrophic and
phototrophic biomass and productivity. Late winter DOM
had low aromaticity indicating reduced inputs of terrestrial
carbon, while the high concentration of dissolved organic
carbon (DOC) suggests that some production of nonchromophoric
dissolved compounds by the microbial food
web took place under the ice cover. Summer DOM had a
strong terrestrial signature, but was also characterized with
significant inputs of algal-derived carbon, especially at the
pond surface. During late winter, bacterial production was
low (maximum of 0.8 mg C m−3 d
−1
) and was largely based
on free-living bacterioplankton (58 %). Bacterial production
in summer was high (up to 58 mg C m−3 d
−1
), dominated
by particle-attached bacteria (67 %), and strongly correlated
with the amount of terrestrial carbon. Primary production
was restricted to summer surface waters due to strong light
limitation deeper in the water column or in winter. The phototrophic
biomass was equal to the heterotrophic biomass,
but as the algae were mostly composed of mixotrophic
species, most probably they used bacteria rather than solar
energy in such shaded ponds. Our results point to a strong
heterotrophic energy pathway in these thaw pond ecosystems,
where bacterioplankton dominates the production of
new carbon biomass in both summer and winter.
...
Julkaisija
Copernicus GmbH; European Geosciences UnionISSN Hae Julkaisufoorumista
1726-4170Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/25662548
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