CGRG Bibliography of Canadian Geomorphology
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Author : Chen, G.; Selbie, D.T.; Griffiths, K.; Sweetman, J.N.; Botrel, M.; Michelutti, N.; Smol, J.P.; and Gregory-Eaves, I.
Date : 2011.
Title : Spatio-temporal distributions of sedimentary chironomids from southwestern Yukon lakes and their relationships with environmental conditions.
Publication : Geohydro 2011. Joint Meeting of the Canadian Quaternary Association and the Canadian Chapter of the International Association of Hydrogeologists. August 28-31, 2011. Quebec City, Quebec.
Issue :
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Abstract
Southwestern Yukon borders the massive Wrangell-St Elias Ice Fields and serves as an ideal area for examining the relative influence of global warming forcing and regional cryospheric cooling on local climate dynamics. To understand lake responses to spatial heterogeneity in regional climate, we analyzed subfossil chironomid assemblages from modern (i.e., “top”) sediments and ca. 1800 AD (i.e., “bottom”) sediments across 18 lakes in SW Yukon. The modern chironomid assemblages showed a high degree of community variability compared to a larger hemispheric-scale calibration set. Observed assemblage variation was most strongly explained by the variables of maximum depth and conductivity. A comparison of top and bottom sediments shows large shifts in community composition, likely related to changes in lake depth/surface area over the past two centuries. More detailed core analyses are underway to fully evaluate space-transgressive patterns.
Bibliography of Canadian Geomorphology