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).
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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 |
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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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