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@ARTICLE{Mayr:256544,
author = {Mayr, C. and Laprida, C. and Lücke, Andreas and Martin, R.
S. and Massaferro, J. and Ramon-Mercau, J. and Wissel,
Holger},
title = {{O}xygen isotope ratios of chironomids, aquatic macrophytes
and ostracods for lake-water isotope reconstructions -
results of a calibration study in {P}atagonia},
journal = {Journal of hydrology},
volume = {529},
number = {Part 2},
issn = {0022-1694},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2015-06428},
pages = {600-607},
year = {2015},
abstract = {Oxygen stable isotopes (δ18O) of biogenic sedimentary
components from lake sediment archives, such as ostracod
valves, are frequently used for palaeoclimatic
reconstructions. However, the effects of host water isotope
changes, temperature-dependent fractionations, and vital
effects on the isotopic ratios of such biogenic proxies
often cannot be disentangled. Here, δ18O values of ostracod
valves, head capsules of chironomid larvae and aquatic
macrophyte cellulose from various lake and stream sites in
southern Patagonia (41–52°S) are compared with δ18O
values of their host waters. The best correlation between
δ18O values of bioproxy and host water was obtained for
aquatic cellulose exhibiting a slope of the regression of
almost unity. Chironomid head capsules showed a strong
correlation, but the data set was rather small (seven
sites). The δ18O values of ostracod valves showed strong
inter-specific vital effects. Strong offsets of ostracod
values from isotopic equilibrium are possibly explained by
re-working of subfossil valves, seasonality effects or
different chemical composition of host waters. A weak, but
significant temperature dependency of oxygen isotope
fractionation was observed for cellulose of one aquatic
taxon (Myriophyllum) and for ostracod calcite, but not for
chironomids and aquatic moss cellulose. The present dataset
suggests that δ18O values of aquatic cellulose are the most
reliable proxy for host water isotope reconstructions, but
clearly more investigations are needed to substantiate this
finding.},
cin = {IBG-3},
ddc = {690},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000364249000016},
doi = {10.1016/j.jhydrol.2014.11.001},
url = {https://juser.fz-juelich.de/record/256544},
}