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Patterns of genetic variation of a species can be shaped by events that occur at wide temporal and geographic scales. Geophysical processes, such as continental glaciations, can affect species vicariance at wide scales whereas processes that act at finer scales, such as gene flow between populations, can have more localized effects. Recent studies have shown that contemporary population structure...
Past glaciation events have played a major role in shaping the genetic diversity and distribution of wild sheep in North America. The advancement of glaciers can isolate populations in ice‐free refugia, where they can survive until the recession of ice sheets. The major Beringian refugium is thought to have held thinhorn sheep (Ovis dalli) populations during times of glacial advance. While isolation...
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