@misc{10481/103848,
year = {2025},
month = {6},
url = {https://hdl.handle.net/10481/103848},
abstract = {The study of oxygen isotopes in chitin and its use as a paleoclimatic proxy is still under development. The low oxygen content of chitin and the low sample weight of fossils have hindered this research topic, even though there is evidence of a strong correlation between the oxygen isotopic composition of chitin and the isotopic composition of the host water. In order to further this research we present a paleoclimatic reconstruction based on δ18O of cladoceran remains from the lake sediments of Laguna de Río Seco, Sierra Nevada, Spain. Here, modern water isotopic data were used as a modern analogue to establish an important influence on evaporative enrichment as the ice-free season advances. The oxygen isotope signal from Daphnia resting eggs was used as a proxy for autumn snapshots of the water isotopic composition at millennial time scales. Long-term changes were controlled by the moisture source and the summer insolation. Between deglaciation and 4.2 kyr BP, δ18O measurements exhibited generally depleted values only interrupted by a peak at ∼ 7.2 kyr BP, concurrent with a temperature maximum inferred from earlier quantitative reconstructions. A predominantly Atlantic moisture source and changes in the evaporation related to seasonality explained the isotopic variability at that time. From 4.2 kyr BP onwards, a notable enrichment in this isotopic signal occurred, which was consistent with greater influence of a Mediterranean precipitation source and higher evaporation at lower lake levels. This new isotope record provides a unique application of paleoclimates from cladocerans, which goes beyond the taxonomic and numerative methodology traditionally used in subfossil cladoceran analysis.},
organization = {European Union’s Horizon 2020 Marie Skłodowska-Curie No 892487},
organization = {Ministerio de Ciencia e Innovación/Agencia Estatal de Investigación/ 10.13039/501100011033/ PID2021-125619OB-C21},
organization = {ERDF A way of making Europe / EU},
organization = {Junta de Andalucía RNM-190},
publisher = {Elsevier},
title = {Holocene changes in moisture source and temperature revealed by the oxygen isotopic composition of fossil Daphnia ephippia in Sierra Nevada, southern Spain},
doi = {10.1016/j.catena.2025.108984},
author = {López-Blanco, Charo and García-Alix Daroca, Antonio and Sánchez Almazo, Isabel María and Jiménez Moreno, Gonzalo and Anderson, R. Scott},
}