Abstract
The stable carbon isotope composition, expressed as δ13C values, of chitinous resting stages of planktivorous invertebrates can provide information on past changes in carbon cycling in lakes. For example, the δ13C values of cladoceran ephippia and bryozoan statoblasts have been used to estimate the past contribution of methane-derived carbon to lake food webs and variations in the δ13C value of planktonic algae. Limited information, however, is available concerning seasonal variations in δ13C values of these organisms and their resting stages. We measured the seasonal variation in δ13C values of Daphnia (Branchiopoda: Cladocera: Daphniidae) and their floating ephippia over a 2-year period in small, dimictic Lake Gerzensee, Switzerland. Floating ephippia of Ceriodaphnia (Branchiopoda: Cladocera: Daphniidae) and statoblasts of Plumatella (Phylactolaemata: Plumatellida: Plumatellidae) were analysed during parts of this period. Furthermore, δ13C values of remains from all three organism groups were analysed in a 62-cm-long sediment core. Throughout the year, Daphnia δ13C values tracked the δ13C values of particulate organic matter (POM), but were more negative than POM, indicating that Daphnia also utilize a relatively 13C-depleted carbon source. Daphnia ephippia δ13C values did not show any pronounced seasonal variation, suggesting that they are produced batch-wise in autumn and/or spring and float for several months. In contrast, δ13C values of Ceriodaphnia ephippia and Plumatella statoblasts followed variations in δ13CPOM values, Ceriodaphnia values being the most negative of the resting stages. Average cladoceran ephippia δ13C values in the flotsam agreed well with ephippia values from Gerzensee surface sediments. In contrast, average Plumatella statoblast δ13C values from the flotsam were 4‰ more negative than in the surface sediments. In the sediment core, δ13C values of the two cladocerans remained low (mean −39.0 and −41.9‰) throughout the record. In contrast, Plumatella had distinctly less negative δ13C values (mean −32.0‰). Our results indicate that in Gerzensee, Daphnia and Ceriodaphnia strongly relied on a 13C-depleted food source throughout the past 150 years, most likely methane-oxidising bacteria, whereas this food source was not a major contribution to the diet of bryozoans.
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Acknowledgements
We thank Clemens Stampfli, Studienzentrum Gerzensee and the Stiftung der Schweizerischen Nationalbank for granting access to Gerzensee, Daniel Steiner for assistance with chlorophyll a measurements and Carole Adolf for providing the sediment trap material. This research was supported by the European Research Council under the European Union’s Seventh Framework Programme (FP/2007–2013)/ERC Grant Agreement No. 239858 (RECONMET).
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Fig. S1
Dissolved CO2 ([CO2]aq) and CH4 ([CH4]aq) concentrations for surface (0.7 m water depth) and bottom waters (8 m water depth) at the lake centre (location C1) over the fieldwork period in 2012–2014 (TIFF 16086 kb)
Fig. S2
(a) Relationship between surface water chlorophyll a concentrations (0.7 m water depth) and Daphnia δ13C at the lake centre (location C1); (b) relationship between log-transformed bottom water dissolved CH4 concentrations ([CH4]aq) (8 m water depth) and Daphnia δ13C at the lake centre (location C1); (c) relationship of the difference between particulate organic matter (POM) δ13C and Daphnia δ13C in the surface water (Δ13CPOM–Daph) and bottom water (8 m water depth) [CH4]aq; (d) surface (0.7 m water depth) and bottom water (8 m water depth) POM δ13C at the lake centre (location C1) (TIFF 31320 kb)
Table S1
Samples collected and analysed in the course of repeated fieldwork on Gerzensee between October 2012 and July 2014. “x” denotes that a sample was collected, “-” shows where no sample was collected (TIFF 8565 kb)
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Morlock, M.A., Schilder, J., van Hardenbroek, M. et al. Seasonality of cladoceran and bryozoan resting stage δ13C values and implications for their use as palaeolimnological indicators of lacustrine carbon cycle dynamics. J Paleolimnol 57, 141–156 (2017). https://doi.org/10.1007/s10933-016-9936-9
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DOI: https://doi.org/10.1007/s10933-016-9936-9