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Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae

Lombino, A; Atkinson, T; Brooks, SJ; Gröcke, DR; Holmes, J; Jones, VJ; Marshall, JD; (2021) Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae. Journal of Paleolimnology 10.1007/s10933-021-00191-z. (In press). Green open access

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Abstract

Oxygen-isotope values of invertebrate cuticle preserved in lake sediments have been used in palaeoenvironmental reconstructions, generally with the assumption that fractionation of oxygen isotopes between cuticle and water (\upalpha_{\text{cuticle}-\text{H}_{2}\text{O}}) is independent of temperature. We cultured chironomid larvae in the laboratory with labelled oxygen-isotope water and across a range of closely controlled temperatures from 5 to 25 °C in order to test the hypothesis that fractionation of oxygen isotopes between chironomid head capsules and water (\upalpha_{\text{chironomid}-\text{H}_{2}\text{O}}) is independent of temperature. Results indicate that the hypothesis can be rejected, and that \upalpha_{\text{chironomid}-\text{H}_{2}\text{O}} decreases with increasing temperature. The scatter in the data suggests that further experiments are needed to verify the relationship. However, these results indicate that temperature-dependence of \upalpha_{\text{chironomid}-\text{H}_{2}\text{O}} should be considered when chironomid δ18O is used as a paleoenvironmental proxy, especially in cases where data from chironomids are combined with oxygen-isotope values from other materials for which fractionation is temperature dependent, such as calcite, in order to derive reconstructions of past water temperature.

Type: Article
Title: Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10933-021-00191-z
Publisher version: https://doi.org/10.1007/s10933-021-00191-z
Language: English
Additional information: © 2021 Springer Nature Switzerland AG. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
Keywords: Oxygen isotopes, Chironomids, Temperature-dependent isotope fractionation, Palaeoenvironments, Limnology
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/10126248
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