Sample collection
We trapped small mammals on MK and MT during two field seasons in 2012
and 2013. Our trapping methodology and permitting information is
described in Camacho-Sanchez et al. (2019). Briefly, we set traps from
ca. 331 to 2,509 masl on MT and from ca. 503 to 3,466 masl on MK (Figure
1a). The mountain treeshrew was the most frequently caught species,
representing 37.5% of all catches. For this study, we included 92Tupaia individuals from our collection: 84 mountain treeshrews
and 8 outgroup individuals from 2 congeners, the pygmy treeshrew
(T. minor, n = 2 ) and the large treeshrew (T. tana, n = 6 )
(Table S1). We also received a loan of genomic DNA from two ruddy
treeshrew voucher specimens housed at the University of Michigan Museum
of Zoology (UMMZ174428 and UMMZ174429).