Chironomid-based paleosalinity records in southern British Columbia, Canada: a comparison of transfer functions |
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| Authors: | Markus L Henrichs Ian R Walker Rolf W Mathewes |
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| Institution: | (1) Biology Department, Okanagan University College, 3333 College Way, Kelowna, British Columbia, Canada, V1V 1V7;(2) Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6;(3) Climate Impacts Research Centre, Abisko Naturvetenskapliga Station, S-981 07 Abisko, Sweden |
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| 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 (R2
(Jackknifed) = 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 R2
(Jackknifed) 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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| Keywords: | Chironomid salinity transfer function paleosalinity climate Holocene British Columbia |
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