Cryptic population structure in sandhill cranes (Antigone canadensis) of the Pacific Flyway

Current management policy in British Columbia treats all Sandhill Cranes as a single population, whereas in the western United States subpopulations are subject to population specific management. Here, we analyze microsatellite markers, mitochondrial DNA sequences, and mitochondrial haplogroups, derived from 203 individual Sandhill Cranes to elucidate population genetic structure of cranes migrating along the Pacific Flyway to summer breeding habitat on the North and Central Coast of British Columbia and southeast Alaska.

STRUCTURE, AMOVA, FST, DAPC, and phylogenetic analyses reveal that geographically separated crane populations along the west coast of North America show substantial genetic differentiation in the Pacific Flyway. These findings are consistent with behavioural and ecological evidence - divergent diets, flyways and breeding habitats. We conclude that the relatively small coastal Sandhill Crane populations deserve special management consideration to safeguard their genetic diversity and adaptations, and to mitigate deleterious impacts of current and future climate change scenarios.