Abstract
Understanding the post-glacial migration of species from their Pleistocene refugia to their modern ranges requires an examination of the influence of topography on migration pathways. We refined the migration ranges of sugar maple (Acer saccharum) since the last ice age, as described by Delcourt and Delcourt (1987), to exclude elevations where sugar maple was unlikely to have existed. The elevations, used as indictors of climatic limits, were based on the modern regional elevation limits of sugar maple. Paleo-range maps of sugar maple were combined with a digital elevation model in a geographic information system to remove the climatically unsuitable regions for sugar maple along its post-glacial migration. The genetic consequences of the interrupted migration pathways of sugar maple are discussed in relation to published studies of broad-spatial-scale genetic diversity in sugar maple.
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