Ice-age persistence and genetic isolation of the disjunct distribution of larch in Alaska

Joseph Napier, Matias Fernandez, Guillaume De Lafontaine & Feng Sheng Hu
Larix laricina (eastern larch, tamarack) is a transcontinental North American conifer with a prominent disjunction in the Yukon isolating the Alaskan distribution from the rest of its range. We investigate whether in situ persistence during the Last Glacial Maximum (LGM) or long-distance postglacial migration from south of the ice sheets resulted in the modern-day Alaskan distribution. We analyzed variation in three chloroplast DNA regions of 840 trees from a total of 69 populations (24 new...
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