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gcb2644-sup-0001-FigureS1.pdfapplication/PDF601KFigure S1. The relationship between skull length and toothrow length is marginally significant in Urocitellus beldingi (F1,119 = 3.6355, Adj. R2 = 0.02149, P = 0.05897, y = 0.034x + 8.1) and Otospermophilus beecheyi (F1,142 = 7.8959, Adj. R2 = 0.01845, P = 0.0568, y = 0.033x + 9.6), but is positive in Callospermophilus lateralis (F1,293 = 18.997, Adj. R2 = 0.05768, P < 0.001, y = 0.056x + 6.2). The right and left upper toothrow lengths are positively correlated in all three species: U. beldingi (F1,132 = 906.75, Adj. R2 = 0.872, P < 0.001, y = 0.93x + 0.62), C. lateralis (F1,344 = 794.3, Adj. R2 = 0.6969, P < 0.001, y = 0.75x + 2.1), and O. beecheyi (F1,166 = 775.91, Adj. R2 = 0.8227, P < 0.001, y = 0.93x + 0.84). Filled circles indicate males and open circles indicate females.
gcb2644-sup-0002-FigureS2.pdfapplication/PDF173KFigure S2. Mid-range elevation specimens are lacking from modern Urocitellus beldingi and low to mid-elevation specimens of Otospermophilus beecheyi are better represented in the historical era, but elevation of collection sites is equivalent between eras in Callospermophilus lateralis. *P < 0.05, **P < 0.01.
gcb2644-sup-0003-FigureS3.pdfapplication/PDF177KFigure S3. Dates of historical and modern specimen collections for Urocitellus beldingi, Callospermophilus lateralis, and Otospermophilus beecheyi; date ranges did not differ significantly. However, since the day of collection range is greater in the historical era for U. beldingi and O. beecheyi than in the modern era, an anova was run comparing skull measurements within the historical era; date outliers, defined as those collected outside the seasonal collection in the modern sample, were compared to non-outliers. Date outliers in U. beldingi were significantly different in skull length and MTRL than those collected at seasonal times represented in the modern samples (skull length: F1,74 = 8.904, P = 0.0038; MTRL: F1,84 = 11.19, P = 0.0012) so these specimens were excluded from analyses. There were no significant differences in O. beecheyi (skull length: F1,100 = 0.63, P = 0.43; MTRL: F1,111 = 0.18, P = 0.67). July 1 = 182.
gcb2644-sup-0004-FigureS4.pdfapplication/PDF539KFigure S4. Skull length is positively correlated with total length and mass in Urocitellus beldingi [total length (F1,111 = 167.59, Adj. R2 = 0.598, P < 0.001, y = 0.085x + 20.9), mass (F1,87 = 71.046, Adj. R2 = 0.2662, P < 0.001, y = 0.021x + 38.5)], Callospermophilus lateralis [total length (F1,258 = 110.71, Adj. R2 = 0.2975, P < 0.001, y = 0.054x + 27.8), mass (F1,177 = 36.618, Adj. R2 = 0.1667, P < 0.001, y = 0.015x + 39.5)], and Otospermophilus beecheyi [total length (F1,143 = 215, Adj. R2 = 0.5978, P < 0.001, y = 0.069x + 27.3), mass (F1,85 = 92.358, Adj. R2 = 0.5151, P < 0.001, y = 0.016x + 47.8)]. Filled circles indicate males and open circles indicate females.
gcb2644-sup-0005-TableS1-SupprtingInformatiom.docWord document114KTable S1. Summary of linear model results.
gcb2644-sup-0006-TableS2-SupprtingInformatiom.docWord document112KTable S2. Summary of specimens divided by chosen elevation.

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