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

2020; Wiley; Volume: 10; Issue: 3 Linguagem: Inglês

10.1002/ece3.6031

2045-7758

Joseph D. Napier, Matias Fernandez, Guillaume de Lafontaine, Feng Sheng Hu,

Genetic diversity and population structure

(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 sampling sites situated on both sides of the Yukon range disjunction pooled with 45 populations from a published source) and conducted ensemble species distribution modeling (SDM) throughout Canada and United States to hindcast the potential range of