The paper http://collins.lternet.edu/sites/temperate.lternet.edu.collins/files/publications/Ratajczak_etal_2022_PNAS.pdf http://collins.lternet.edu/sites/temper

The paper http://collins.lternet.edu/sites/temperate.lternet.edu.collins/files/publications/Ratajczak_etal_2022_PNAS.pdf http://collins.lternet.edu/sites/temperate.lternet.edu.colli... which sadly the article neglects to link to says this: > Several differences between bison and cattle behavior potentially explain why bison increased species richness more than cattle. While the existence of DNA fragments from forbs and woody plants has been identified within bison dung (58), nongrass species comprise a minor portion of bison diet in comparison to grasses, as evidenced by direct identification of forage con- sumed (59), carbon isotope values of bison hair (59), and microhistology of bison dung (60). In contrast, the higher dominant grass cover in the cattle treatment suggests that these domesticated grazers likely consume more nongrass species than bison. This is consistent with studies of cattle diets in tall- grass prairie and elsewhere which found forbs comprise 10 to 34% of cattle diet (61, 62). In addition to differences in bison and cattle foraging behavior, bison also create physical distur- bances (e.g., wallows) and grazing lawns (34) that increase hab- itat heterogeneity (20) and thus species richness across scales (63), whereas cattle do not form soil disturbances similar to bison wallows.