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Kit Fox Population Study

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Species often face multiple threats. We considered the relative impact of three major threats on populations of the San Joaquin kit fox. This species was once widely distributed across the southern San Joaquin Valley, but agriculture and development have replaced much of the now endangered subspecies’ habitat. We modeled impacts of climate change, land-use change, and rodenticide exposure on kit fox populations using a spatially explicit, individual-based population model. Our study indicates that landuse change will have the biggest impact on kit fox populations, with the potential to decrease populations by approximately 9% under a compact growth scenario or 15% under a business-as-usual scenario. 55% of the best kit fox habitat also has …show more content…

Climatic changes are expected to change species distributions, phenologies, interspecific interactions, community composition, and ecosystem function (Schneider & Root 2002). Many of these impacts have already been observed (Parmesan 2006). In California’s San Joaquin Valley, temperatures are projected to be warmer in both winter and summer, with a mean annual increase of 1.4–2.0°C by 2070 (PRBO Conservation Science 2011). Additionally, precipitation is projected to decrease (-9% to -30%), although there is a high degree of uncertainty surrounding the magnitude of the precipitation changes (PRBO Conservation Science 2011). Summer heat waves are projected to become longer and hotter, and droughts more severe (Garfin et al. 2012).

The San Joaquin kit fox (Vulpes macrotis mutica) is a small, desert fox that persists primarily around the perimeter of the San Joaquin Valley in central California. It is an endangered subspecies of the more widely occurring kit fox. The fox eats primarily kangaroo rats where their ranges overlap, or a variety of other food sources (voles, ground squirrels, rats, mice, insects). The current population size for the San Joaquin kit fox is unknown, but estimates are 90%) habitat overlaps with areas designated by areas of potential solar …show more content…

Brooks (EPA), J. Heinrichs (UW), S. McMillin (California Department of Fish and Wildlife) and C. Wilsey (UW). Landuse change scenarios were developed by Jim Thorne and the Information Center for the Environment at UC Davis. The information in this document has been funded in part by the U.S. Environmental Protection Agency. It has been subjected to review by the National Health and Environmental Effects Research Laboratory’s Western Ecology Division and approved for publication. Approval does not signify that the contents reflect the views of the Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for

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