Management of public lands, and who should have access to them, is often contentious. Most ranches in the western US rely upon seasonal grazing access to public lands, and conflict over biodiversity management has led to proposals to restrict grazing access on public lands. We evaluate whether grazing restrictions on public rangelands could have the unintended effect of increasing the conversion of private rangeland to cropland, causing habitat loss for sage-grouse, a species of conservation concern. Using a model parameterized with empirical observations of land use change and ranch versus cropland profitability, we explore how changes to public lands grazing policy could affect ranch profitability and consequently land use on private lands across the western US. We predict that restricting grazing of public lands by 50% would result in the loss of an additional 171,400 ha of sage-grouse habitat on private lands by 2050, on top of the 842,000 ha predicted to be lost under business as usual. Most of this conversion would affect sage-grouse mesic habitat, 75% of which occurs on private land and is vital to the species during brood rearing. Under such policy changes, we estimate that an additional 105,700 ha (3.24%) of sage-grouse mesic habitat held on private land in the study region would be directly lost by 2050, and the cumulative area affected by fragmentation would be much higher. By considering the human and ecological links between public and private land, we show that attempts to improve habitat on public lands via grazing restrictions could result in greater system-wide fragmentation of sage-grouse habitat from unintended habitat loss on private lands. Synthesis and applications. Policy interventions on public lands can affect private landholders. Landholders' responses can result in unintended consequences, both for habitat on private land and community support for conservation. Restricting grazing on US public lands is likely to increase habitat loss on private lands and reduce community support for sage grouse conservation. Policy that manages resources on public lands while also supporting sustainable, economically viable ranching operations on private lands is a promising approach to maximizing sage grouse habitat.
Bibliographical noteFunding Information:
This research was conducted by the Better Land Use Decisions expert working group supported in part by Science for Nature and People Partnership (SNAPP), a collaboration of The Nature Conservancy, the Wildlife Conservation Society, and the National Center for Ecological Analysis and Synthesis (NCEAS) at the University of California, Santa Barbara and the Gordon and Betty Moore Foundation proposal 4641. SNAPP is a first-of-its-kind collaboration that delivers evidence-based, scalable solutions to global challenges at the intersection of nature conservation, sustainable development and human well-being. We thank Dave Lewis, John Withey, TNC and USDA staff, and ranchers across the western US for their insights. The views in this manuscript from United States Fish and Wildlife Service authors are their own and do not necessarily represent the views of the United States Fish and Wildlife Service.
© 2018 The Authors. Journal of Applied Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society
- grazing restrictions
- land use
- perverse outcomes
- public lands
- rangeland management