Geographic Variation in Genital Morphology among Insular and Mainland Populations of Peromyscus maniculatus and Peromyscus oreas

Sullivan, Robert M.; Calhoun, Stuart W.; Greenbaum, Ira F.

doi:10.2307/1381315

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…If sexual selection is responsible for genital diversification and elaboration through a similar runaway process, then variation in the degree and direction of selection may result in a general trend of geographic variation in genitalic traits. This seems likely as geographic variation in genitalia has been shown for many taxa (Sullivan et al , 1990; Hribar, 1994; Kelly et al , 2000; Tatsuta & Akimoto, 2000; but see Zeh & Zeh, 1994 and Bond et al , 2001).…”

Section: Discussionmentioning

confidence: 91%

“…While variation in external morphology over geographic space is well studied, geographic variation in genitalia has received less attention, despite the importance of genital traits in species‐level taxonomy (Eberhard, 1985). Genitalic structures can vary in size and shape between different geographic populations and has been demonstrated in a number of taxa including snakes (Inger & Marx, 1962), fish (Kelly, Godin & Abdallah, 2000), mammals (Sullivan, Calhoun & Greenbaum, 1990), millipedes (Tanabe, Katakura & Mawatari, 2001), mosquitoes (Hribar, 1994) and snails (Madec & Guillar, 1994). However, the mechanism driving such variation is unclear.…”

Section: Introductionmentioning

confidence: 99%

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Geographic variation in genital morphology of Ciulfina praying mantids

Holwell

2008

Journal of Zoology

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Geographic variation in morphological traits is widespread and important to our current understanding of evolutionary processes. Although male genitalia are perhaps the most divergent morphological traits in animals, geographic variation in genital traits has received little attention and the mechanism driving such variation is unclear. The species isolation hypothesis of genital evolution makes explicit predictions about geographic variation in genitalia predicting patterns of genital divergence that reflect the risk of mating with related but incompatible species. The sexual selection and pleiotropy hypotheses, however, predict general levels of geographic variation that reflect divergent sexual selection pressures or genetic drift. To test these predictions, we investigated geographic variation in genital morphology in the praying mantid genus Ciulfina (Mantodea: Liturgusidae) using elliptic Fourier analysis. We found significant levels of geographic variation in the genital morphology of four Ciulfina species irrespective of the relative proximity of different populations to contact zones with other species. These results reject the species isolation hypothesis, and instead support either the sexual selection or pleiotropy hypotheses to explain patterns of genital evolution in this genus.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Geographic variation in genital morphology of Ciulfina praying mantids

Holwell

2008

Journal of Zoology

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“…; deer mice, Peromyscus maniculatus and Peromyscus oreas ; Sullivan et al. ), geographic effects on female genitalia have not been well‐documented and further research is warranted.…”

Section: Discussionmentioning

confidence: 99%

The evolution of genital shape variation in female cetaceans*

et al. 2017

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Male genital diversification is likely the result of sexual selection. Female genital diversification may also result from sexual selection, although it is less well studied and understood. Female genitalia are complex among whales, dolphins, and porpoises, especially compared to other vertebrates. The evolutionary factors affecting the diversity of vaginal complexity could include ontogeny, allometry, phylogeny, sexual selection, and natural selection. We quantified shape variation in female genitalia using 2D geometric morphometric analysis, and validated the application of this method to study soft tissues. We explored patterns of variation in the shape of the cervix and vagina of 24 cetacean species (n = 61 specimens), and found that genital shape varies primarily in the relative vaginal length and overall aspect ratio of the reproductive tract. Extensive genital shape variation was partly explained by ontogenetic changes and evolutionary allometry among sexually mature cetaceans, whereas phylogenetic signal, relative testis size, and neonate size were not significantly associated with genital shape. Female genital shape is diverse and evolves rapidly even among closely related species, consistent with predictions of sexual selection models and with findings in invertebrate and vertebrate taxa. Future research exploring genital shape variation in 3D will offer new insights into evolutionary mechanisms because internal vaginal structures are variable and can form complex spirals.

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“…The specific status of P. areas has been further supported by morphologic Allard et al 1987;Gunn and Greenbaum, 1986;Sullivan et al, 1990), and electrophoretic (Calhoun and Greenbaum, 1991) evidence.…”

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confidence: 83%

Systematic and Taxonomic Implications of Karyotypic, Electrophoretic, and Mitochondrial-Dna Variation in Peromyscus from the Pacific Northwest

Hogan

Hedin

Koh³

et al. 1993

Journal of Mammalogy

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Chromosomes, allozymes, and mitochondrial DNA (mtDNA) were analyzed to examine the taxonomic and systematic relationships of coastal Peromyscus from northern Washington to southern Alaska. All three datasets indicate that Peromyscus from this region constitute two distinct groups. One group comprises P. oreas, P. sitkensis, and several currently recognized subspecies of P. maniculatus including P. m. algidus, P. m. hylaeus, P. m. keeni, P. m. macrorhinus, and P. m. prevostensis. The second group comprises only populations of P. m. austerus. The. former group is differentiated from the latter by number of autosomal arms, allele-frequency differences, and mtDNA haplotypes. This dichotomy in karyotype, and the level of allozymic and mtDNA divergence between the groups suggest that the groups constitute distinct species. We recommend that P. oreas, P. sitkensis, P. maniculatus algidus, P. m. hylaeus, P. m. keeni, P. m. macrorhinus, and P. m. prevostensis be recognized under the specific epithet of Peromyscus keeni.The taxonomy of deer mice (Peramyscus) inhabiting the Pacific Northwest from Washington to southern Alaska has been complicated by extensive insular endemism resulting in a plethora of recognized taxa. Hall (1981) recognized two species in this region,P. maniculatusandP. sitkensis. From the Columbia River north to southern Alaska and west of the Cascade and Coastal mountain ranges, P. maniculatus was considered to comprise 27 subspecies distributed over the entire mainland and on most of the associated islands (Hall, 1981). Despite considerable evidence supporting the specific status of P. areas (Dice, 1949; J ohnson and Ostenson, 1959; Liu, 1954; Sheppe, J. Mamm., 74(4):819-831,1993 819 1961), Hall (1981) retained the taxon as a subspecies of P. maniculatus. Gunn andGunn (1988) reexamined the systematic status of areas and concluded that it is distinct from sympatric populations of P. m. austerus.These taxa can be discretely separated based on the number of autosomal arms (fundamental number, FN) in the karyotype. Populations of P. areas are characterized by a high FN (85-92), whereas P. m. austerus has a low FN (74-78). The absence of intermediate FNs in areas of sympatry was interpreted to indicate reproductive isolation.The specific status of P. areas has been further supported by morphologic (Allard and

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Geographic Variation in Genital Morphology among Insular and Mainland Populations of Peromyscus maniculatus and Peromyscus oreas

Cited by 9 publications

References 22 publications

Geographic variation in genital morphology of Ciulfina praying mantids

Geographic variation in genital morphology of Ciulfina praying mantids

The evolution of genital shape variation in female cetaceans*

Systematic and Taxonomic Implications of Karyotypic, Electrophoretic, and Mitochondrial-Dna Variation in Peromyscus from the Pacific Northwest

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