An ostracod-conductivity transfer function for Tibetan lakes |
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| Authors: | Steffen Mischke Ulrike Herzschuh Gudrun Massmann Chengjun Zhang |
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| Institution: | 1.Institute of Geological Sciences, Freie Universit?t Berlin,Berlin,Germany;2.Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam,Potsdam,Germany;3.Lanzhou University, Centre for Arid Environment and Paleoclimate Research,Gansu,China |
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| Abstract: | About 145 freshwater to hypersaline lakes of the eastern Tibetan Plateau were investigated to develop a transfer function
for quantitative palaeoenvironmental reconstructions using ostracods. A total of 100 lakes provided sufficient numbers of
ostracod shells. Multivariate statistical techniques were used to analyse the influence of a number of environmental variables
on the distributions of surface sediment ostracod assemblages. Of 23 variables determined for each site, 19 were included
in the statistical analysis. Lake water electrical conductivity (8.2%), Ca% (7.6%) and Fe% (4.8%, ion concentrations as %
of the cations) explained the greatest amounts of variation in the distribution of ostracod taxa among the 100 lakes. Electrical
conductivity optima and tolerances were calculated for abundant taxa. A transfer function, based on weighted averaging partial
least squares regression (WA-PLS), was developed for electrical conductivity (r
2 = 0.71, root-mean-square-error of prediction RMSEP] = 0.35 12.4% of gradient length], maximum bias = 0.64 22.4% of gradient
length], as assessed by leave-one-out cross-validation) based on 96 lakes. Our results show that ostracods provide reliable
estimates of electrical conductivity and can be used for quantitative palaeoenvironmental reconstructions similarly to more
commonly used diatom, chironomid or pollen data. |
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| Keywords: | Electrical conductivity Salinity Calibration data set CCA Weighted averaging partial least squares regression (WA-PLS) Transfer function Ostracoda Tibetan Plateau |
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