Trowbridge's shrew, Sorex trowbridgii, is distributed from Santa Barbara County, CA, northwards to southern British Columbia, and east along the Sierra Nevada. Five geographic subspecies have been recognized for decades. Until recently, no data were available to describe genetic structure within this species. We will present inferences from mitochondrial cytochrome b sequences, ddRADseq nuclear data, skull morphometrics, pelt coloration, and niche modeling. In general, there is significant genetic structure, possibly at the species level, with some indication of past gene flow or incomplete sorting in some regions. Geographic trends exist in skull shape and size, as well as in coat color.

Chris Conroy is the staff curator of mammals at the Museum of Vertebrate Zoology at UC Berkeley. He earned a B.S. in Zoology at UC Davis and a Ph.D. at the University of Alaska, Fairbanks. He helped develop an ancient DNA lab at Stanford before moving to UC Berkeley. He has participated in small mammal surveys in Alaska and California and has published on topics including island biogeography, systematics and hybrid zones in voles, genetics of invasive Rattus, mammal community ecology in the Grinnell Resurvey Project, and most recently is involved with the California Conservation Genetics Project.