Quantitative analysis of freshwater ostracode assemblages in
southwestern Yukon Territory,Canada |
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Authors: | Email author" target="_blank">Joan?BunburyEmail author K?Gajewski |
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Institution: | (1) Laboratory for Paleoclimatology and Climatology, Department of Geography, University of Ottawa, Ontario, Canada , K1N 6N5 |
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Abstract: | Relations between modern ostracode assemblages and environmental variables from lakes in the southwest Yukon and northern British Columbia were explored. A total of 29 freshwater species representing 8 genera were identified from the sediments of 36 lakes, with the number of species ranging between 3 and 8 per lake. Species widespread throughout the study area include Cyclocypris ampla, Candona candida, Cypria turneri, Cypria ophtalmica, and Candona protzi. The Mg/Ca ratio is an important factor determining the ostracode species composition of a lake. Species richness is at a maximum when the lake water has intermediate values of conductivity. Lakes in which one species clearly dominates the assemblage (>70% relative abundance) have water saturated with respect to CaCO3. Mg/Ca ratio, depth and Sr are the environmental factors that are most highly correlated with species distributions in this region. |
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Keywords: | ostracodes limnology paleolimnology subarctic Canada Yukon detrended correspondence analysis (DCA) canonical correspondence analysis (CCA) species tolerance |
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