A northwest North American training set: distribution of freshwater midges in relation to air temperature and lake depth

Springer Science and Business Media LLC - Tập 36 - Trang 295-314 - 2006
Erin M. Barley1, Ian R. Walker2, Joshua Kurek3, Les C. Cwynar3, Rolf W. Mathewes, Konrad Gajewski4, Bruce P. Finney5
1Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
2Departments of Biology, and Earth and Environmental Sciences, University of British Columbia Okanagan, Kelowna, Canada
3Department of Biology, University of New Brunswick, Fredericton, Canada
4Department of Geography and Ottawa-Carleton Geoscience Centre, University of Ottawa, Ottawa, Canada
5Institute of Marine Science, University of Alaska Fairbanks, Fairbanks, USA

Tóm tắt

Freshwater midges, consisting of Chironomidae, Chaoboridae and Ceratopogonidae, were assessed as a biological proxy for palaeoclimate in eastern Beringia. The northwest North American training set consists of midge assemblages and data for 17 environmental variables collected from 145 lakes in Alaska, British Columbia, Yukon, Northwest Territories, and the Canadian Arctic Islands. Canonical correspondence analyses (CCA) revealed that mean July air temperature, lake depth, arctic tundra vegetation, alpine tundra vegetation, pH, dissolved organic carbon, lichen woodland vegetation and surface area contributed significantly to explaining midge distribution. Weighted averaging partial least squares (WA-PLS) was used to develop midge inference models for mean July air temperature (r boot 2  = 0.818, RMSEP = 1.46°C), and transformed depth (ln (x+1); r boot 2  = 0.38, and RMSEP = 0.58).

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