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Paleoecology of late-glacial terrestrial deposits with in situ conifers from the submerged continental shelf of western Canada

Published online by Cambridge University Press:  20 January 2017

Terri Lacourse ,
Rolf W. Mathewes  and
Daryl W. Fedje
Terri Lacourse*
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
Rolf W. Mathewes
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
Daryl W. Fedje
Affiliation:
Parks Canada, Victoria, British Columbia V8W 1E2, Canada
*
*Corresponding author. Fax: +604-291-3496.Email Address:tlacours@sfu.ca (T. Lacourse)
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Abstract

Extensive portions of the continental shelf off the coast of British Columbia were subaerially exposed during Late Wisconsinan deglaciation due to lowering of relative sea level by as much as 150 m. Paleoecological analyses were conducted at two sites on the emergent continental shelf where terrestrial surfaces with in situ conifers are preserved. The woody plant remains confirm that, during the latest period of subaerial exposure, terrestrial vegetation was established on the continental shelf. Microscopic identification of fossil wood, and analyses of pollen and plant macrofossils from the associated paleosols and overlying shallow pond sediments indicate that productive Pinus contorta-dominated communities with abundant Alnus crispa and ferns grew on the shelf adjacent to and on the Queen Charlotte Islands around 12,200 14C yr B.P. Dwarf shrubs including Salix and Empetrum, and herbaceous plants such as Heracleum lanatum and Hippuris vulgaris, were also important components of the shelf vegetation. Near northern Vancouver Island, mixed coniferous forests dominated by Pinus contorta with Picea, Tsuga spp., Alnus spp., and ferns occupied the shelf at 10,500 14C yr B.P.

Keywords

PaleoecologyPollen analysisContinental shelfLate-glacialPaleosolsSea level changeBritish Columbia
Type
Research Article
Information
Quaternary Research , Volume 60 , Issue 2 , September 2003 , pp. 180 - 188
Copyright
University of Washington

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References

Argus, G.W., (1973). The Genus Salix in Alaska and the Yukon. National Museum of Natural Sciences, Publications in Botany, No. 2, National Museums of Canada, Ottawa.Google Scholar
Barrie, J.V., and Conway, K.W., (1999). Late Quaternary glaciation and postglacial stratigraphy of the northern Pacific margin of Canada. Quaternary Research 51, 113 123.CrossRefGoogle Scholar
Barrie, J.V., Conway, K.W., Mathewes, R.W., Josenhans, H.W., and Johns, M.J., (1993). Submerged late Quaternary terrestrial deposits and paleoenvironment of northern Hecate Strait, British Columbia continental shelf, Canada. Quaternary International 20, 123 129.CrossRefGoogle Scholar
Benninghoff, W.S., (1962). Calculation of pollen and spores density in sediments by addition of exotic pollen in known quantities. Pollen et Spores 53, 332 333.Google Scholar
Birks, H.H., and Birks, H.J.B., (2000). Future use of pollen analysis must include plant macrofossils. Journal of Biogeography 27, 31 35.CrossRefGoogle Scholar
Blaise, B., Clague, J.J., and Mathewes, R.W., (1990). Time of maximum Late Wisconsin glaciation, west coast of Canada. Quaternary Research 34, 282 295.CrossRefGoogle Scholar
Clague, J.J., Harper, J.R., Hebda, R.J., and Howes, D.E., (1982). Late Quaternary sea-levels and coastal movements, coastal British Columbia. Canadian Journal of Earth Sciences 19, 597 618.CrossRefGoogle Scholar
Clague, J.J., Mathewes, R.W., and Warner, B.G., (1982). Late Quaternary geology of eastern Graham Island, Queen Charlotte Islands, British Columbia. Canadian Journal of Earth Sciences 19, 1786 1795.CrossRefGoogle Scholar
Critchfield, W.B., (1985). The late Quaternary history of lodgepole and jack pines. Canadian Journal of Forest Research 15, 749 772.CrossRefGoogle Scholar
Cwynar, L.C., Burden, E., and McAndrews, J.C., (1979). An inexpensive method for concentrating pollen and spores from fine-grained sediments. Canadian Journal of Earth Sciences 16, 1115 1120.CrossRefGoogle Scholar
Douglas, G.W., Straley, G.B., and Meidinger, D., (1989). The Vascular Plants of British Columbia. British Columbia Ministry of Forests. Special Report Series 1–4, Victoria.Google Scholar
Dunwiddie, P.W., (1985). Dichotomous key to conifer foliage in the Pacific Northwest. Northwest Science 59, 185 191.Google Scholar
Fægri, K., and Iversen, J., (1989). Textbook of Pollen Analysis. 4th Ed Wiley, Toronto.Google Scholar
Fedje, D.W., and Josenhans, H., (2000). Drowned forests and archaeology on the continental shelf of British Columbia, Canada. Geology 28, 99 102.2.0.CO;2>CrossRefGoogle Scholar
Friedman, J., (1978). Wood Identification by Microscopic Examination. British Columbia Provincial Museum. Heritage Record No. 5, Victoria.Google Scholar
Friele, P.A., (1991). Holocene relative sea-level change. Vargas Island, British Columbia. Unpublished M.Sc. Thesis. Simon Fraser University, Burnaby.Google Scholar
Havinga, A.J., (1964). Investigation into the differential corrosion susceptibility of pollen and spores. Pollen et Spores 4, 621 635.Google Scholar
Hebda, R.J., (1983). Late-glacial and postglacial vegetation history at Bear Cove Bog, northeast Vancouver Island, British Columbia. Canadian Journal of Botany 61, 3172 3192.CrossRefGoogle Scholar
Heinrichs, M.L., Antos, J.A., Hebda, R.J., and Allen, G.B., (2002). Abies lasiocarpa (Hook.) Nutt. in the late-glacial and early-Holocene vegetation in British Columbia, Canada, and adjacent regions in Washington, USA. Review of Palaeobotany and Palynology 120, 107 122.CrossRefGoogle Scholar
Heusser, C.J., (1989). North Pacific coastal refugia - the Queen Charlotte Islands in perspective. Scudder, G.G.E., and Gessler, N. The Outer Shores. Queen Charlotte Island Museum, Skidegate. 91 106.Google Scholar
Heusser, C.J., (1995). Late-Quaternary vegetation response to climatic-glacial forcing in North Pacific America. Physical Geography 16, 118 149.CrossRefGoogle Scholar
Howes, D.E., (1983). Late Quaternary sediments and geomorphic history of northern Vancouver Island, British Columbia. Canadian Journal of Earth Sciences 20, 57 65.CrossRefGoogle Scholar
Josenhans, H.W., Fedje, D.W., Conway, K.W., and Barrie, J.V., (1995). Post glacial sea levels on the Western Canadian continental shelf. evidence for rapid change, extensive subaerial exposure and early human habitation. Marine Geology 125, 73 94.CrossRefGoogle Scholar
Josenhans, H., Fedje, D., Pienitz, R., and Southon, J., (1997). Early humans and rapidly changing Holocene sea levels in the Queen Charlotte Islands-Hecate Strait, British Columbia, Canada. Science 277, 71 74.CrossRefGoogle Scholar
Klinka, K., Krajina, V.J., Ceska, A., and Scagel, A.M., (1989). Indicator Plants of Coastal British Columbia. University of British Columbia Press, Vancouver.Google Scholar
Luternauer, J.L., Clague, J.J., Conway, K.W., Barrie, J.V., Blaise, B., and Mathewes, R.W., (1989). Late Pleistocene terrestrial deposits on the continental shelf of western Canada. Evidence for rapid sea-level change at the end of the last glaciation. Geology 17, 357 360.2.3.CO;2>CrossRefGoogle Scholar
Mandryk, C.A.S., Josenhans, H., Fedje, D.W., and Mathewes, R.W., (2001). Late Quaternary paleoenvironments of Northwestern North America. Implications for inland versus coastal migration routes. Quaternary Science Reviews 20, 301 314.CrossRefGoogle Scholar
Mangerud, J., Andersen, S.T., Berglund, B.E., and Donner, J.J., (1974). Quaternary stratigraphy of Norden, a proposal for terminology and classification. Boreas 3, 109 128.CrossRefGoogle Scholar
Mathewes, R.W., (1989). Paleobotany of the Queen Charlotte Islands. Scudder, G.G.E., and Gessler, N. The Outer Shores. Queen Charlotte Island Museum, Skidegate. 75 90.Google Scholar
Mathewes, R.W., (1993). Evidence for Younger Dryas-age cooling on the north Pacific coast of America. Quaternary Science Reviews 12, 321 331.CrossRefGoogle Scholar
Mathewes, R.W., Vogel, J.S., Southon, J.R., and Nelson, D.E., (1985). Accelerator radiocarbon date confirms early deglaciation of the Queen Charlotte Islands. Canadian Journal of Earth Sciences 22, 790 791.CrossRefGoogle Scholar
Mathewes, R.W., Heusser, L.E., and Patterson, R.T., (1993). Evidence for a Younger Dryas-like cooling event on the British Columbia coast. Geology 21, 101 104.2.3.CO;2>CrossRefGoogle Scholar
Minckley, T., and Whitlock, C., (2000). Spatial variation of modern pollen in Oregon and southern Washington, USA. Review of Palaeobotany and Palynology 112, 97 123.CrossRefGoogle ScholarPubMed
Mott, R.J., Grant, D.R., Stea, R., and Occhietti, S., (1986). Late-glacial climatic oscillation in Atlantic Canada equivalent to the Allerd/Younger Dryas event. Nature 323, 247 250.CrossRefGoogle Scholar
Panshin, A.J., de Zeeuw, C., and Brown, H.P., (1964). Textbook of Wood Identification. McGraw-Hill, New York.Google Scholar
Patterson, R.T., (1993). Late Quaternary benthic foraminiferal biofacies and paleoceanography of Queen Charlotte Sound and southern Hecate Strait, British Columbia. Journal of Foraminiferal Research 23, 1 18.CrossRefGoogle Scholar
Peteet, D.M., (1991). Postglacial migration history of lodgepole pine near Yakutat, Alaska. Canadian Journal of Botany 69, 786 796.CrossRefGoogle Scholar
Pojar, J., and MacKinnon, A., (1994). Plants of Coastal British Columbia. Lone Pine, Vancouver.Google Scholar
Stuiver, M., and Reimer, P.J., (1993). Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon 35, 215 230.CrossRefGoogle Scholar
Stuiver, M., Reimer, P.J., Bard, E., Beck, J.W., Burr, G.S., Hughen, K.A., Kromer, B., McCormac, F.G., van der Plicht, J., and Spurk, M., (1998). INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon 40, 1041 1083.CrossRefGoogle Scholar
Warner, B.G., (1984). Late Quaternary paleoecology of eastern Graham Island, Queen Charlotte Islands, British Columbia, Canada. Unpublished. Ph.D. Thesis. Simon Fraser University, Burnaby.Google Scholar
Warner, B.G., and Chmielewski, J.G., (1987). Biometric analysis of modern and Late Pleistocene cones of Picea from western Canada. New Phytologist 107, 449 457.CrossRefGoogle ScholarPubMed
Warner, B.G., Mathewes, R.W., and Clague, J.J., (1982). Ice-free conditions on the Queen Charlotte Islands, British Columbia, at the height of late Wisconsin glaciation. Science 218, 675 677.CrossRefGoogle ScholarPubMed