A Description of the Baculum and Os Clitoris of Eutamias townsendii ochrogenys

Adams, Damon; Sutton, Dallas A.

doi:10.2307/1378743

Cited by 19 publications

(8 citation statements)

References 4 publications

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“…To account for ontogenetic variation, specimens were classified into three age categories (juveniles, subadults, and adults) based on patterns of maxillary dentition (Beg and Hoffman 1977). Subadults and adults were pooled in morphometric analyses because the baculum has been repeatedly shown to obtain adult dimensions relatively early in development (White 1953;Adams and Sutton 1968;Beg and Hoffman 1977). Juveniles and specimens of unknown age (skull damaged or absent) were examined for classification purposes only (n ϭ 29, see below).…”

Section: Morphometric Data Collection and Analysesmentioning

confidence: 99%

“…In general, the evolutionary processes driving differentiation of animal genitalia remains controversial and several viable alternatives to the lock-and-key interpretation exist (for reviews, see Eberhard 1985;Arnqvist 1997). In Tamias, a lock-and-key explanation of bacular divergence is based on the protrusion of the baculum from the glans during copulation (Adams and Sutton 1968) and subsequent potential to perform a species-specific reproductive function (Patterson and Thaeler 1982). The extent to which bacular differentiation in Tamias results in, or is predictive of, reproductive isolation has never been directly addressed.…”

Section: Evolutionary Implications Of Asymmetric Introgressionmentioning

confidence: 99%

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Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

et al. 2003

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Abstract. If phylogeographic studies are to be broadly used for assessing population-level processes relevant to speciation and systematics, the ability to identify and incorporate instances of hybridization into the analytical framework is essential. Here, we examine the evolutionary history of two chipmunk species, Tamias ruficaudus and Tamias amoenus, in the northern Rocky Mountains by integrating multivariate morphometrics of bacular (os penis) variation, phylogenetic estimation, and nested clade analysis with regional biogeography. Our results indicate multiple examples of mitochondrial DNA introgression layered within the evolutionary history of these nonsister species. Three of these events are most consistent with recent and/or ongoing asymmetric introgression of mitochondrial DNA across morphologically defined secondary contact zones. In addition, we find preliminary evidence where a fourth instance of nonconcordant characters may represent complete fixation of introgressed mitochondrial DNA via a more ancient hybridization event, although alternative explanations of convergence or incomplete sorting of ancestral polymorphisms cannot be dismissed with these data. The demonstration of hybridization among chipmunks with strongly differentiated bacular morphology contradicts long-standing assumptions that variation within this character is diagnostic of complete reproductive isolation within Tamias. Our results illustrate the utility of phylogeographic analyses for detecting instances of reticulate evolution and for incorporating this and other information in the inference of the evolutionary history of species.

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Section: Morphometric Data Collection and Analysesmentioning

confidence: 99%

Section: Evolutionary Implications Of Asymmetric Introgressionmentioning

confidence: 99%

Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

et al. 2003

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“…Adams and Sutton (1968) concluded that N. townsendii ochrogenys had a baculum distinct from that of N. townsendii and suggested that this distinction warranted species differentiation. Sutton and Nadler (1974) analyzed bacular morphology of three subspecies of N.…”

Section: Generic Debates the Geographic Distribution Ofmentioning

confidence: 99%

Molecular Phylogeny of the Chipmunks Inferred from Mitochondrial Cytochrome b and Cytochrome Oxidase II Gene Sequences

Piaggio

Spicer

2001

Molecular Phylogenetics and Evolution

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Section: Evolutionary Implications Of Asymmetric Introgressionmentioning

confidence: 99%

Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

Good

Demboski

Nagorsen

et al. 2003

Evol

View full text Add to dashboard Cite

If phylogeographic studies are to be broadly used for assessing population-level processes relevant to speciation and systematics, the ability to identify and incorporate instances of hybridization into the analytical framework is essential. Here, we examine the evolutionary history of two chipmunk species, Tamias ruficaudus and Tamias amoenus, in the northern Rocky Mountains by integrating multivariate morphometrics of bacular (os penis) variation, phylogenetic estimation, and nested clade analysis with regional biogeography. Our results indicate multiple examples of mitochondrial DNA introgression layered within the evolutionary history of these nonsister species. Three of these events are most consistent with recent and/or ongoing asymmetric introgression of mitochondrial DNA across morphologically defined secondary contact zones. In addition, we find preliminary evidence where a fourth instance of nonconcordant characters may represent complete fixation of introgressed mitochondrial DNA via a more ancient hybridization event, although alternative explanations of convergence or incomplete sorting of ancestral polymorphisms cannot be dismissed with these data. The demonstration of hybridization among chipmunks with strongly differentiated bacular morphology contradicts long-standing assumptions that variation within this character is diagnostic of complete reproductive isolation within Tamias. Our results illustrate the utility of phylogeographic analyses for detecting instances of reticulate evolution and for incorporating this and other information in the inference of the evolutionary history of species.

show abstract

A Description of the Baculum and Os Clitoris of Eutamias townsendii ochrogenys

Cited by 19 publications

References 4 publications

Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

Molecular Phylogeny of the Chipmunks Inferred from Mitochondrial Cytochrome b and Cytochrome Oxidase II Gene Sequences

Phylogeography and Introgressive Hybridization: Chipmunks (Genus Tamias) in the Northern Rocky Mountains

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