MOLECULAR EVIDENCE FOR GENETIC SUBDIVISIONS IN THE DESERT SHREW, NOTIOSOREX CRAWFORDI

Examination of cytochrome-b DNA sequences from specimens of Notiosorex crawfordi, the desert shrew, indicate that within this taxon there are at least 3 major subdivisions reflecting levels of variation more typical of species rather than subspecies. One of these cytochrome-b haplotypes was recently...

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Bibliographic Details
Published in:The Southwestern naturalist 2007-09, Vol.52 (3), p.410-417
Main Authors: Rex McAliley, L, O'Neill, Mark B, Baker, Robert J
Format: Article
Language:English
Subjects:
Biological taxonomies
Collections
Colleges & universities
Deoxyribonucleic acid
DNA
Feature s
Genes
Genetic variation
Genomes
Haplotypes
Introns
Museums
Notiosorex crawfordi
Phylogenetics
Polymerase chain reaction
Shrews
Species
Trees
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Summary:Examination of cytochrome-b DNA sequences from specimens of Notiosorex crawfordi, the desert shrew, indicate that within this taxon there are at least 3 major subdivisions reflecting levels of variation more typical of species rather than subspecies. One of these cytochrome-b haplotypes was recently described as a previously unrecognized species; however, that paper was limited to the description of a species level name. We provide additional insight into subdivisions in N. crawfordi. One DNA haplotype is distributed in Texas, New Mexico, and eastern Arizona, a second haplotype in Arizona and Sonora, Mexico, and the third haplotype in Baja California, Mexico. Nucleotide sequences obtained from intron 7 of the nuclear gene, beta fibrinogen, support the conclusions that 2 of the haplotypes occur sympatrically in southeastern Arizona and are not hybridizing with each other.
ISSN:0038-4909
1943-6262
DOI:10.1894/0038-4909(2007)52[410:MEFGSI]2.0.CO;2