Chironomid-based paleosalinity records in southern British Columbia, Canada: A comparison of transfer functions.
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| Authors: | Heinrichs, Markus L.; Walker, Ian R.; Mathewes, Rolf W. |
| Year: | 2001 |
| Journal: | Journal of Paleolimnology 26: 147-159 |
| Title: | Chironomid-based paleosalinity records in southern British Columbia, Canada: A comparison of transfer functions. |
| Abstract: | Chironomid remains from Big Lake, British Columbia were analysed and paleosalinities were estimated using a pre-existing transfer function and several developed using new regression methods. A two component partial-least-squares model (PLS-2) had the highest coefficient of determination (R(Jackknifed)2=0.75) and lowest root-mean-squared error-of-prediction (RMSEP). As compared to the pre-existing model, it was also less sensitive to the influence of rare taxa. Nevertheless, the marginally larger R(Jackknifed)2 and lower RMSEP do not clearly identify a single best model. The models were applied to Big, Mahoney and Kilpoola lakes, revealing the sensitivity of paleosalinity inferences to model selection. A synopsis of chironomid-based paleosalinities in British Columbia and their correspondence with other paleoclimatic data are presented and discussed. |
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