Geographic variation within species
Collection location and its interaction with Tissue type were highly
significant in the full model (Supplementary Table S1) but to account
for unbalanced sampling and understand drivers of these interactions, we
also compared the effect of location within each species and tissue type
separately. For X. sonorina , samples collected in Davis and Tempe
locations differed in species composition for both the crop and gut
(Supplementary Table S4; Bray-Curtis crop R2 = 0.16 F
= 4.47 p <0.001; gut R2 = 0.093 F = 3.10 p
<0.001). For X. tabaniformis , samples from Davis and
ABDSP differed in species composition, but only significantly in the
gut, but to a lesser extent in the crop (Bray-Curtis dissimilarity gut
R2 = 0.17 F = 4.18 p <0.001, crop
R2 = 0.15 F = 1.58 p = 0.073).