E-mail : marco.caccianiga@unimi.it

Recent white spruce dynamics on the eastern coast of Hudson Bay , Québec, Canada

marcocaccianiga2.jpg

The species-specific response of tree-line species to climatic forcing is a crucial topic in modelling climate-driven ecosystem dynamics. In northern Québec, Canada, black spruce (Picea mariana) is the dominant species at the tree line, but white spruce (Picea glauca) also occurs along the maritime coast of Hudson Bay, and is expanding along the coast and on lands that have recently emerged because of isostatic uplift. Here we outline the present distribution, structure, dynamics and recent spread of white spruce from the tree line up to its northernmost position in the shrub tundra along the Hudson Bay coast. We aimed to obtain a minimum date of the arrival of the species in the area and to evaluate its dynamics relative to recent climate changes.

Publications


Caccianiga, M., Payette, S., Filion, L. 2008. Biotic disturbance in expanding subarctic forests along the eastern coast of Hudson Bay. New Phytologist, 178: 823-834.
doi: 10.1111/j.1469-8137.2008.02408.

Caccianiga, M., Payette, S. 2006. Recent advance of white spruce (Picea glauca) in the coastal tundra of the eastern shore of Hudson Bay (Québec, Canada) Journal of Biogeography, 33: 2120-2135.

Payette, S., Delwaide, A., Caccianiga, M., Beauchemin, M., 2004. Accelerated thawing of subarctic peatland permafrost over the last 50 years. Geophysical Research Letters, 31: 1-4.