North American montane red foxes

Expansion, fragmentation, and the origin of the Sacramento Valley red fox

Benjamin Sacks, Mark J. Statham, John D. Perrine, Samantha M. Wisely, Keith B. Aubry

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Most native red foxes (Vulpes vulpes) in the western contiguous United States appear to be climatically restricted to colder regions in the major mountain ranges and, in some areas, have suffered precipitous declines in abundance that may be linked to warming trends. However, another population of unknown origin has occurred in arid habitats in the Sacramento Valley of California well outside this narrow bioclimatic niche since at least 1880. If native, this population would be ecologically distinct among indigenous North American red foxes. We used mitochondrial and microsatellite markers from historical and modern samples (modes: 1910-1930 and 2000-2008, respectively) obtained throughout the western United States to determine the origins of the Sacramento Valley red fox, and assess the historical and modern connectivity and genetic effective population sizes of Sacramento Valley and montane red foxes. We found clear and consistent evidence supporting the indigenous origin of the Sacramento Valley population, including the phylogenetic positioning of the dominant, endemic mtDNA clade and microsatellite clustering of the Sacramento Valley population with the nearest montane population. Based on both mitochondrial and microsatellite AMOVAs, connectivity among Western populations of red foxes declined substantially between historical and modern time periods. Estimates based on temporal losses in gene diversity for both marker types suggest that both the Sierra Nevada (including the Southern Cascades population) and the Sacramento Valley populations have small genetic effective population sizes. Significant heterozygote excesses also indicate the occurrence of recent bottlenecks in these populations. Both substitutions distinguishing the 2 endemic Sacramento Valley haplotypes from the dominant montane haplotype were in the coding region and nonsynonymous, consistent with adaptive differences. These findings along with previously reported body size distinctions between Sacramento Valley and montane red foxes argue for distinct subspecific status for the Sacramento Valley red fox, for which we propose the designation V. v. patwin n. subsp. The small genetic effective population size estimates for the Sierra Nevada red fox and Sacramento Valley red fox are cause for concern, as is the possibility of genetic introgression into the latter population from an adjacent, recently established nonnative population.

Original languageEnglish (US)
Pages (from-to)1523-1539
Number of pages17
JournalConservation Genetics
Volume11
Issue number4
DOIs
StatePublished - Jun 1 2010

Fingerprint

Vulpes vulpes
fragmentation
valleys
valley
Population
effective population size
Population Density
Microsatellite Repeats
population size
Western United States
microsatellite repeats
connectivity
Haplotypes
haplotypes
Cascade Mountain region
cold region
introgression
cold zones
Body Size
Heterozygote

Keywords

  • Gene flow
  • Genetic structure
  • Phylogeography
  • Red fox
  • Sacramento Valley
  • Subspecies
  • V. v. patwin
  • Vulpes vulpes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Cite this

North American montane red foxes : Expansion, fragmentation, and the origin of the Sacramento Valley red fox. / Sacks, Benjamin; Statham, Mark J.; Perrine, John D.; Wisely, Samantha M.; Aubry, Keith B.

In: Conservation Genetics, Vol. 11, No. 4, 01.06.2010, p. 1523-1539.

Research output: Contribution to journalArticle

Sacks, Benjamin ; Statham, Mark J. ; Perrine, John D. ; Wisely, Samantha M. ; Aubry, Keith B. / North American montane red foxes : Expansion, fragmentation, and the origin of the Sacramento Valley red fox. In: Conservation Genetics. 2010 ; Vol. 11, No. 4. pp. 1523-1539.
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