Brief communication. Systematic implications of chromosomal data from two insular species of Peromyscus from the Gulf of California

Santa Catalina Island has an endemic mouse, Peromyscus slevini, which is the only native rodent species on the island. However, specimens of P. fraterculus have been recorded on the island. P. fraterculus is the most common species of Peromyscus off Santa Catalina Island in the Baja California peninsula. The records show the absence of P. slevini in the 1990s and an increasing number of P. fraterculus during the 2000s. P. slevini has recently been collected in 2007. The current situation in Santa Catalina Island shows a strong expansion of P. fraterculus and the restriction of P. slevini to the canyons. This study confirms for the first time the recent invasion of a peninsular native species in one island on the Gulf of California. Peromyscus fraterculus is a better desert adapted species in contrast to P. slevini. Under those conditions, in the near future, P. slevini could be extinct.

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Invasive migration of a mainland rodent to santa catalina island and its effect on the endemic species Peromyscus slevini

Álvarez-Castañeda

Arnaud

Cortés‐Calva

et al. 2009

Biol Invasions

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Microsatellite variation and evolution in the Peromyscus maniculatus species group

Chirhart

Honeycutt

Greenbaum

2005

Molecular Phylogenetics and Evolution

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Genealogical Concordance and the Specific Status of Peromyscus sejugis

Walker

Chirhart²,

Moore³

et al. 2006

Journal of Heredity

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Peromyscus sejugis, a peripheral isolate of Peromyscus maniculatus, is a threatened taxon endemic to 2 small islands in the Sea of Cortés. Although its insularity makes the specific recognition of P. sejugis inherently problematic, resolution of this problem has important conservation implications. To evaluate the specific validity and evolutionary history of P. sejugis, we compared sequence variation (ND3/ND4L/ND4) in mtDNA for both island populations of P. sejugis with that for 8 populations of P. maniculatus from mainland Baja California. Each island population of P. sejugis had a single haplotype (0.7% sequence divergence), whereas 11 different haplotypes (mean sequence divergence = 0.68%) were obtained for the populations of P. maniculatus. The mean sequence divergence between the populations of the 2 species was 2.0%. Nested clade analysis supports the conclusion that P. sejugis is an insular isolate of P. maniculatus from mainland Baja California. Although our analysis confirms a low level of mtDNA divergence between P. sejugis and P. maniculatus from Baja California, the genealogical concordance of morphological, chromosomal, microsatellite, and mtDNA haplotype distinctiveness supports the conclusion that the 2 island populations of P. sejugis constitute independent evolutionarily significant units and together represent a phylogenetic species distinct from the P. maniculatus from Baja California.

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Brief communication. Systematic implications of chromosomal data from two insular species of Peromyscus from the Gulf of California

Cited by 6 publications

References 14 publications

Invasive migration of a mainland rodent to santa catalina island and its effect on the endemic species Peromyscus slevini

Invasive migration of a mainland rodent to santa catalina island and its effect on the endemic species Peromyscus slevini

Microsatellite variation and evolution in the Peromyscus maniculatus species group

Genealogical Concordance and the Specific Status of Peromyscus sejugis

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