“…David et al., ; Kurilshikov, Wijmenga, Fu, & Zhernakova, ), a key theme was testing for effects of local environment, diet or host genetic background on symbiont community composition, either between populations of a single species (Kohl, Varner, Wilkening, & Dearing, ; Näpflin & Schmid‐Hempel, ) or between cohabiting species (Muletz Wolz, Yarwood, Campbell Grant, Fleischer, & Lips, ). Mihaljevic, Hoye, and Johnson () extended this to also consider the role of alternate host species, in conjunction with environmental factors, in shaping symbiont communities across populations of a focal host species. Within a host species, the spatial and hierarchical structure of social interactions was also shown to shape the transmission of individual microbes (and disease susceptibility) in populations (Keiser, Pinter‐Wollman, Ziemba, Kothamasu, & Pruitt, ; Keiser et al., ; Raulo, ), as were several different types of indirect interactions.…”