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The stable carbon isotopic composition of Daphnia ephippia in small, temperate lakes reflects in-lake methane availability
University of Bern, Switzerland; University of Bern, Switzerland.
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
University of Bern, Switzerland; University of Bern, Switzerland; University of Southampton, England.
University of Bern, Switzerland.
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2015 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 60, no 3, 1064-1075 p.Article in journal (Refereed) Published
Abstract [en]

Daphnia can ingest methane-oxidizing bacteria and incorporate methanogenic carbon into their biomass, leading to low stable carbon isotope ratios (expressed as delta C-13 values) of their tissue. Therefore, delta C-13 analysis of Daphnia resting eggs (ephippia) in lake sediment records can potentially be used to reconstruct past in-lake availability of methane (CH4). However, detailed multilake studies demonstrating that delta C-13 values of recently deposited Daphnia ephippia (delta C-13(ephippia)) are systematically related to in-lake CH4 concentrations ([CH4](aq)) are still missing. We measured delta C-13(ephippia) from surface sediments of 15 small lakes in Europe, and compared these values with late-summer [CH4](aq). delta C-13(ephippia) ranged from -51.6 parts per thousand to -25.9 parts per thousand, and was strongly correlated with [CH4](aq) in the surface water and above the sediment (r -0.73 and -0.77, respectively), whereas a negative rather than the expected positive correlation was found with delta C-13 values of carbon dioxide (CO2) (r -0.54), and no correlation was observed with [CO2](aq). At eight sites, offsets between delta(13) C-CO2 and delta C-13(ephippia) exceeded offsets between delta C-13(CO2) and delta C-13(algae) reported in literature. delta C-13(ephippia) was positively correlated with delta C-13 values of sedimentary organic matter (r 0.54), but up to 20.7 parts per thousand lower in all except one of the lakes (average -6.1 parts per thousand). We conclude that incorporation of methanogenic carbon prior to ephippia formation must have been widespread by Daphnia in our study lakes, especially those with high [CH4](aq). Our results suggest a systematic relationship between delta C-13(ephippia) values and [CH4](aq) in small temperate lakes, and that delta C-13(ephippia) analysis on sediment records may provide insights into past changes in in-lake [CH4](aq).

Place, publisher, year, edition, pages
Association for the Sciences of Limnology and Oceanography (ASLO) , 2015. Vol. 60, no 3, 1064-1075 p.
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Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:liu:diva-119259DOI: 10.1002/lno.10079ISI: 000354490100026OAI: oai:DiVA.org:liu-119259DiVA: diva2:820725
Note

Funding Agencies|European Research Council under the European Unions Seventh Framework Programme (FP)/ERC Grant [239858]; Swedish Research Council (VR); Swedish Research Council (FORMAS)

Available from: 2015-06-12 Created: 2015-06-12 Last updated: 2017-12-04

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