Evaporation effects as reflected in freshwaters and ostracod calcite from modern environments in Central and Northeast Yakutia (East Siberia,Russia) |
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Authors: | Sebastian Wetterich Ulrike Herzschuh Hanno Meyer Lyudmila Pestryakova Birgit Plessen C M Larry Lopez Lutz Schirrmeister |
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Institution: | (1) Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany;(2) Department of Biology and Geography, Yakutsk State University, Belinskogo 58, 677000 Yakutsk, Russia;(3) GeoForschungsZentrum Potsdam, Section 3.3, Telegrafenberg, 14473 Potsdam, Germany;(4) The United Graduate School of Agricultural Sciences, Iwate University, 020-8550 18-8, Ueda 3 chome, Morioka, Japan |
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Abstract: | Taxonomical and geochemical investigations on freshwater ostracods from 15 waters in Central and Northeast (NE) Yakutia have
been undertaken in order to estimate their potential usefulness in palaeoenvironmental reconstructions based on regional fossil
records. Higher variability in environmental factors such as pH, electrical conductivity, and ionic content was observed in
thermokarst-affected lakes in Central Yakutia than in NE Yakutia lakes. Species diversity of freshwater ostracods reached
up to eight taxa per lake, mostly dominated by Candona weltneri Hartwig 1899, in Central Yakutia, whereas in NE Yakutian waters the diversity was lower and Candona muelleri jakutica Pietrzeniuk 1977 or Fabaeformiscandona inaequivalvis (Sars 1898) had highest frequencies. Coupled analyses of stable isotopes (δ18O, δ13C) and element ratios (Sr/Ca, Mg/Ca) were performed on both host waters and ostracod calcite, aiming to estimate the modern
relationships. Correlations between host waters and ostracod calcite of single species were found for δ18O, δ13C and Sr/Ca and Mg/Ca ratios. The relationships between δ18O, Mg/Ca and Sr/Ca ratios and electrical conductivity (salinity) as an expression of solute concentrations in the waters mainly
controlled by evaporation are more complicated but evident, and may be useful in future interpretation of geochemical data
from fossil Siberian ostracods.
Handling editor: K. Martens |
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Keywords: | Freshwater ostracods Stable isotopes Element ratios Evaporation Thermokarst lakes East Siberia |
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