Genetic management and setting recovery goals for Mexican wolves (Canis lupus baileyi) in the wild

Abstract

Mexican wolf recovery planning has spanned >3 decades, yet federal and state planners have not reached consensus on how to structure recovery efforts with the remaining inbred founder lineages to maximize genetic diversity while balancing many other demographic and social considerations. The US Fish and Wildlife Service and state wildlife agencies are working to draft a revised recovery plan specific to the Mexican wolf that will appropriately incorporate genetic concerns in recovery criteria that can be implemented on a human-dominated landscape. Inbreeding effects, where present in the remaining lineages, are stochastic and unpredictable in a management context. Despite these effects, population growth in Mexican wolves the past 5years rivals the rate observed in Yellowstone wolves during the last decade. While small populations risk extinction via inbreeding depression, there are often larger, more imminent threats of demographics, mortality, or habitat loss that may impact success of recovery efforts. Releasing captive-reared wolves is problematic and often creates conflict in local human communities, but fostering of captive-born wolves into wild wolf packs is a viable means of increasing genetic diversity and decreasing habituated wolf-human conflict. There are many alternative ways to estimate the number of wolves per population needed to recover the Mexican wolf. Efforts should thus be made to provide for sufficient genetic diversity, but not at the expense of more immediate factors that influence successful recovery.