PALEOLIMNOLOGICAL INVESTIGATION OF LAKES AND PONDS ON BANKS ISLAND, N.W.T., CANADIAN HIGH ARCTIC
In the High Arctic, surface sediment samples (~ top 1cm) represent an integrated sample of diatom communities, both spatially (i.e. from various habitats) and temporally (i.e. last few years of deposition). A quantitative relationship between the dominant surface sediment diatom assemblages and present-day limnic properties can be established in order to produce environmental reconstruction models. This study focuses on the development of a calibration set for Banks Island, N.W.T., and the application of this environmental reconstruction model to 3 lacustrine cores from Banks Island. Cores were retrieved from the following sites: (a) 34cm core from lake BK-AH (73º35.57N, 119º35.01W), (b) 6.0 cm core from pond BK-3 (73º11.583N, 119º38.091W), and (c) 10 cm core from pond BK-5 (73º12.732N, 119°34.452W). Generally, core findings show a shift from greater diatom diversity in the top sections to a dominance of two to three key species throughout the remainder of the core. The calibration set construction is currently in progress, however all results to date, including general trends driving species variance amongst the sampled sites, and core stratigraphies are described in this poster presentation.