Land Use Affects Carbon Sources to the Pelagic Food Web in a Small Boreal Lake
Rinta, P., van Hardenbroek, M., Jones, R., Kankaala, P., Rey, F., Szidat, S., Wooller, M. J., & Heiri, O. (2016). Land Use Affects Carbon Sources to the Pelagic Food Web in a Small Boreal Lake. PLoS ONE, 11(8), Article e0159900. https://doi.org/10.1371/journal.pone.0159900
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2016Copyright
© 2016 Rinta et al. This is an open access article distributed under the terms of the
Creative Commons Attribution License.
Small humic forest lakes often have high contributions of methane-derived carbon in their
food webs but little is known about the temporal stability of this carbon pathway and how it
responds to environmental changes on longer time scales. We reconstructed past variations
in the contribution of methanogenic carbon in the pelagic food web of a small boreal
lake in Finland by analyzing the stable carbon isotopic composition (δ13C values) of chitinous
fossils of planktivorous invertebrates in sediments from the lake. The δ13C values of
zooplankton remains show several marked shifts (approx. 10 ‰), consistent with changes
in the proportional contribution of carbon from methane-oxidizing bacteria in zooplankton
diets. The results indicate that the lake only recently (1950s) obtained its present state with
a high contribution of methanogenic carbon to the pelagic food web. A comparison with historical
and palaeobotanical evidence indicates that this most recent shift coincided with agricultural
land-use changes and forestation of the lake catchment and implies that earlier
shifts may also have been related to changes in forest and land use. Our study demonstrates
the sensitivity of the carbon cycle in small forest lakes to external forcing and that
the effects of past changes in local land use on lacustrine carbon cycling have to be taken
into account when defining environmental and ecological reference conditions in boreal
headwater lakes.
...
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Except where otherwise noted, this item's license is described as © 2016 Rinta et al. This is an open access article distributed under the terms of the
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