CGRG Bibliography of Canadian Geomorphology
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Author : Galloway, J.M.; Patterson, R.T.; and Roe, H.M
Date : 2007.
Title : A palynological record of postglacial climate and forest dynamics from Tiny Lake, central mainland coast of British Columbia.
Publication : Yellowknife 2007. Annual Conference of the Geological Association of Canada - Mineralogical Association of Canada. May 23-25, 2007. Yellowknife, Northwest Territories, Canada.
Issue :
Page(s) :
Abstract
Pollen preserved in sediments from Tiny Lake in the Seymour-Belize Inlet region of the central mainland coast of British Columbia document postglacial changes in vegetation and climate and succeeds previous research at nearby Two Frog Lake. Following deglaciation prior to ca. 12,000 yr BP (ca. 14,150 cal. yr BP), a pine woodland grew at Tiny Lake when the climate was cool and dry. At ca. 11,900 yr BP (ca. 14,000 cal. yr BP), the climate became moister, which permitted spruce and fir to grow locally. Younger Dryas cooling at ca. 10,400 yr BP (12,000 cal. yr BP) arrested successional trends and allowed pine to re-expand but comparison with the pollen record from Two Frog Lake indicates that this was a local response. By ca. 10,150 yr BP (ca. 11,700 cal. yr BP) the climate became warmer and supported western hemlock and alder on moist sites but by 8740 ± 70 yr BP (9740 cal. yr BP) wetter conditions permitted western hemlock and Cupressaceae to expand. The timing of early Holocene vegetation change at Tiny Lake and at Two Frog Lake preceeded change elsewhere in coastal British Columbia where a warm and dry climate persisted until ca. 7500-7000 yr BP (ca. 8200-7800 cal. yr BP) but it is not clear whether synoptic scale climate variability or factors particular to the Seymour Belize Inlet Complex were the proximate cause of change. At 6860 ± 50 yr BP (7692 cal. yr BP) Cupressaceae replaced western hemlock at Tiny Lake when a modern cool and wet climate was established. Neoglacial climate deterioration at ca. 3900 yr BP (ca. 4350 cal. yr BP) is registered at Tiny Lake when peak expansion of Cupressaceae was reached but it is not documented at Two Frog Lake. The differences in the timing and nature of vegetation change to post-glacial climate fluctuations within the Seymour-Belize Inlet Complex demonstrate that the response of coastal forests to climate change can be highly variable, even on small spatial scales
Bibliography of Canadian Geomorphology