Partial reproductive isolation of subspecies of the California vole, Microtus californicus

Gill, Ayesha E.

doi:10.1007/bf00121821

Cited by 15 publications

(25 citation statements)

References 20 publications

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“…Hybrids were intermediate in all measurements, and, in canonical vectors, were closer to the southern group than the northern group. With only two populations sampled, Gill (1984) lacked much geographical context for these two divergent groups. The parental groups that Gill (1984) used fell well within the distribution of the two phylogeographical groups described by Conroy & Neuwald (2008).…”

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

“…With only two populations sampled, Gill (1984) lacked much geographical context for these two divergent groups. The parental groups that Gill (1984) used fell well within the distribution of the two phylogeographical groups described by Conroy & Neuwald (2008). A possible confounding factor in the study by Gill (1984) is that all the animals examined were laboratory reared, which might have altered their morphology away from a wild state.…”

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

“…Several other subspecies were described before and after Kellogg's work (Hall, 1981). Gill (1984) crossed specimens of Microtus californicus californicus (from Berkeley, Alameda County, CA, USA) and Microtus californicus stephensi (from the Santa Monica Mountains, Los Angeles County, CA, USA) and found increased aggression between potential mates, and fertility of offspring was diminished. Gill (1984) not only took 11 cranial measurements, but also included weights of heart, liver, and kidneys, as well as body weight, in the analyses.…”

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

“…Gill (1984) crossed specimens of Microtus californicus californicus (from Berkeley, Alameda County, CA, USA) and Microtus californicus stephensi (from the Santa Monica Mountains, Los Angeles County, CA, USA) and found increased aggression between potential mates, and fertility of offspring was diminished. Gill (1984) not only took 11 cranial measurements, but also included weights of heart, liver, and kidneys, as well as body weight, in the analyses. Gill (1984) conducted a variety of discriminant analyses with and without hybrids as a group, as well as with and without relative organ weights.…”

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

“…Gill (1984) not only took 11 cranial measurements, but also included weights of heart, liver, and kidneys, as well as body weight, in the analyses. Gill (1984) conducted a variety of discriminant analyses with and without hybrids as a group, as well as with and without relative organ weights. She found that parental groups could be correctly classified 91.8% of the time.…”

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 99%

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Cranial morphology of the California vole (Microtus californicus, Cricetidae) in a contact zone

Conroy

Gupta

2011

Biological Journal of the Linnean Society

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Zones of contact between divergent biological forms within or between species are critical to the study of speciation. How characters flow across contact zones can be informative of the speciation process. To better understand this phenomenon in a mammal, we investigated cranial shape change in a contact zone between northern and southern phylogeographical groups of California voles (Microtus californicus). We took 12 linear measurements of skulls, one measurement of the mandible, and coded the presence and absence of two skull foramina for 427 specimens. In multivariate analyses, skulls within parental regions were correctly assigned more than 90% of the time. In the contact zone, 49% were classified as northern and 51% as southern, with a bimodal distribution of posterior probability values. Foraminal patterns in the contact zone were intermediate between northern and southern regions. A cline analysis for coastal populations suggested a similar centre for mitochondrial and nuclear markers, although a centre for the morphological data was offset. Cranial morphology indicates an intermediate area with overlap between the two regions, as suggested by the molecular data, with a pattern distinct from mitochondrial DNA or nuclear DNA markers.

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Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 98%

Section: History Of Morphological Study Of California Vole Skullsmentioning

confidence: 99%

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Cranial morphology of the California vole (Microtus californicus, Cricetidae) in a contact zone

Conroy

Gupta

2011

Biological Journal of the Linnean Society

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Mito‐nuclear discordance across a recent contact zone for California voles

Lin

Conroy

et al. 2018

Ecology and Evolution

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To examine the processes that maintain genetic diversity among closely related taxa, we investigated the dynamics of introgression across a contact zone between two lineages of California voles (Microtus californicus). We tested the prediction that introgression of nuclear loci would be greater than that for mitochondrial loci, assuming ongoing gene flow across the contact zone. We also predicted that genomic markers would show a mosaic pattern of differentiation across this zone, consistent with genomes that are semi‐permeable. Using mitochondrial cytochrome b sequences and genome‐wide loci developed via ddRAD‐seq, we analyzed genetic variation for 10 vole populations distributed along the central California coast; this transect included populations from within the distributions of both parental lineages as well as the putative contact zone. Our analyses revealed that (1) the two lineages examined are relatively young, having diverged ca. 8.5–54 kya, (2) voles from the contact zone in Santa Barbara County did not include F1 or early generation backcrossed individuals, and (3) there appeared to be little to no recurrent gene flow across the contact zone. Introgression patterns for mitochondrial and nuclear markers were not concordant; only mitochondrial markers revealed evidence of introgression, putatively due to historical hybridization. These differences in genetic signatures are intriguing given that the contact zone occurs in a region of continuous vole habitat, with no evidence of past or present physical barriers. Future studies that examine specific isolating mechanisms, such as microhabitat use and mate choice, will facilitate our understanding of how genetic boundaries are maintained in this system.

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Kinships in a natural meadow vole population

Sheridan

Tamarin

1986

Behav Ecol Sociobiol

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Partial reproductive isolation of subspecies of the California vole, Microtus californicus

Cited by 15 publications

References 20 publications

Cranial morphology of the California vole (Microtus californicus, Cricetidae) in a contact zone

Cranial morphology of the California vole (Microtus californicus, Cricetidae) in a contact zone

Mito‐nuclear discordance across a recent contact zone for California voles

Kinships in a natural meadow vole population

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