Anna Kearns is a postdoctoral research fellow at the Smithsonian Conservation Biology Institute’s Center for Conservation Genomics. Kearns is an evolutionary biologist, primarily focused on untangling the evolutionary history, systematics and taxonomy of birds at the early stages of speciation. Such groups often have conflicting genomic signatures resulting from their recent shared histories and from hybridization during the early stages of speciation. Her postdoctoral fellowship at the Smithsonian is focused on the common raven (Corvus corax)—a species whose genome appears to be formed from two distinct lineages that were on the pathway to speciation but have instead begun to merge back into a single species. Such examples of “speciation reversal” are rare in nature but expected to become more common as climate change and habitat loss forces species to rapidly come into contact with each other.
Kearns' work at the Smithsonian is focused on uncovering how recent changes in the range of ravens over the past 100 years have impacted the progress of speciation reversal. To do this, she is using genomic sequence capture techniques to obtain thousands of variable regions from the genomes of raven specimens that were collected by museums in the late 1800s and early 1900s. Kearns’ work will provide a framework for the management of other cases of speciation reversal and help to determine the distinctiveness of Channel Island and Clarion Island ravens, as well as the source of migrants of recent raven expansions in the western U.S. in order to resolve their conservation status and direct management actions to protect endangered species that are at risk from ravens.
Kearns, A.M., Joseph, L., White, L., Austin, J., Baker, C., Driskell, A.C., Malloy, J.F., & Omland, K.E. 2016. Norfolk Island Robins are a distinct endangered species: ancient DNA unlocks surprising relationships and phenotypic discordance within the Australo-Pacific Robins. Conservation Genetics 17: 321-335.
Kearns, A.M., Joseph, L., Cook, L.G. 2014. Australia’s arid-adapted butcherbirds experienced range expansions during Pleistocene glacial maxima. Nature Communications 5: 3994. doi:10.1038/ncomms4994
Kearns, A.M., Joseph, L., Omland, K.E., Cook, L.G. 2011. Testing the effect of transient Plio-Pleistocene barriers in monsoonal Australo-Papua: did mangrove habitats maintain genetic connectivity in the Black Butcherbird? Molecular Ecology 20: 5042–5059.