| historic distribution and challenges to bison recovery in the northern chihuahuan desert. | ecologists and conservationists have long assumed that large grazers, including bison (bison bison), did not occur in post-pleistocene southwestern north america. this perception has been influential in framing the debate over conservation and land use in the northern chihuahuan desert. the lack of an evolutionary history of large grazers is being used to challenge the validity of ranching as a conservation strategy and to limit the protection and reintroduction of bison as a significant compone ... | 2007 | 18173472 |