A tale of two conifers: Migration across a dispersal barrier outpaced regional expansion from refugia

Matias Fernandez, Feng Sheng Hu, Daniel Gavin, Guillaume De Lafontaine & Katy Heath
Aim: Understanding how climate refugia and migration over great distances have facilitated species survival during past climate changes is crucial for evaluating contemporary threats to biodiversity, particularly in the face of dispersal barriers. We address this longstanding question on the refugial origins and post-glacial development of mesic forests. Location: Pacific Northwest, North America. Taxon: Mountain hemlock (Tsuga mertensiana) and western redcedar (Thuja plicata) Methods: Range-wide genotyping-by-sequencing (ddRADseq) of both study species and a pollen reconstruction...
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