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Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae
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 ( α cuticle - H 2 O ) is independent of temperature. We cultured chironomid l...
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Published in: | Journal of paleolimnology 2021-08, Vol.66 (2), p.117-124 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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 (
α
cuticle
-
H
2
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 (
α
chironomid
-
H
2
O
) is independent of temperature. Results indicate that the hypothesis can be rejected, and that
α
chironomid
-
H
2
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
α
chironomid
-
H
2
O
should be considered when chironomid δ
18
O 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. |
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ISSN: | 0921-2728 1573-0417 |
DOI: | 10.1007/s10933-021-00191-z |