Morphological and Mitochondrial DNA Variation in a Hybrid Zone Between Short-Tailed Shrews (Blarina) in Nebraska

Benedict, Russell A.

doi:10.2307/1383213

Cited by 9 publications

(23 citation statements)

References 46 publications

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“…1). These findings are contrary to expectations given that the distribution is unquestionably parapatric in Nebraska and hybridization appears to be limited (Genoways and Choate 1972;Benedict 1999aBenedict , 1999b.…”

Section: Introductioncontrasting

confidence: 99%

“…We hypothesize that B. brevicauda and B. hylophaga are parapatric in Iowa and Missouri, as they are in Nebraska (Genoways and Choate 1972;Benedict 1999aBenedict , 1999b. We further hypothesize based on the findings of Moncrief et al (1982) that the two species hybridize and introgress more in Iowa and Missouri than in Nebraska, which would explain the presence of the intermediate-sized specimens.…”

Section: Introductionmentioning

confidence: 77%

“…1). Benedict (1999aBenedict ( , 1999b) also concluded that occasional hybridization occurred but with little to no introgression. Bowles (1975Bowles ( , 1977, also using morphometrics, confirmed the presence of the brevicauda-hylophaga contact zone in southwestern Iowa but found no indication of introgression.…”

Section: Introductionmentioning

confidence: 99%

“…Three of these species have distinct karyotypes (B. brevicauda, B. carolinensis, and B. hylophaga; Genoways et al 1977;George et al 1981George et al , 1982 and also can be distinguished easily with mitochondrial DNA (mtDNA) sequence data (Benedict 1999a(Benedict , 1999bBrant and Ortí 2002;Brant 2005;Reilly et al 2005). Despite their genetic differences, Blarina species are similar morphologically but, in most instances, can be distinguished morphometrically (Blair 1939;Graham and Semken 1976;Jones et al 1984;Kays and Wilson 2002;Reilly et al 2005;Benedict et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Genoways and Choate (1972) studied this contact zone further using morphometrics and discovered that it was narrow and parapatric with possible hybridization occurring. Using morphometrics and mtDNA sequence data, Benedict (1999aBenedict ( , 1999b re-examined the contact zone in Nebraska and ascertained that it was 2.9 km wide at its widest point, again indicating a parapatric distribution (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Identification and characterization of the contact zone between short-tailed shrews (Blarina) in Iowa and Missouri

et al. 2011

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Short-tailed shrews (genus Blarina Gray, 1838) are characterized by divergent karyotypes and are genetically distinct. Blarina species are similar morphologically but, in most cases, can be distinguished morphometrically. Blarina distributions tend to be parapatric along well-defined contact zones; however, it has been suggested that the northern short-tailed shrew (Blarina brevicauda (Say, 1823)) and Elliot's short-tailed shrew (Blarina hylophaga Elliot, 1899) occur sympatrically in Iowa and Missouri. To evaluate this possibility, 179 specimens were collected in southwestern Iowa and northwestern Missouri. Karyotypes and total length were used for field identification, and amplified fragment length polymorphism (AFLP) analysis was used to verify field identifications and to investigate the extent of hybridization. One hundred seventyeight of 179 specimens were identified to species. The one exception had a karyotype of B. brevicauda (2n = 50, FN = 48); however, AFLP analysis indicated that this individual was likely an F1 hybrid. No backcrosses were detected, so it appears that introgression is minimal. The putative hybrid was trapped at a locality with B. brevicauda just north of a locality having only B. hylophaga. No locality contained both species. Therefore, these species are not broadly sympatric as has been suggested, but rather exhibit a distribution similar to the pattern of parapatry seen in most of the contact zones of Blarina.Résumé : Les musaraignes à queue courte (du genre Blarina Gray, 1838) se caractérisent par des caryotypes divergents et sont génétiquement distinctes. Les espèces de Blarina sont semblables morphologiquement, mais dans la plupart des cas, la morphométrie permet de les distinguer. Les répartitions des Blarina ont tendance à être parapatriques le long de zones de contact bien définies; on croit néanmoins que la grande musaraigne à queue courte (Blarina brevicauda (Say, 1823)) et la musaraigne à queue courte d'Elliot (Blarina hylophaga Elliot, 1899) se retrouvent en sympatrie en Iowa et au Missouri. Afin de vérifier cette possibilité, nous avons récolté 179 spécimens dans le sud-ouest de l'Iowa et le nord-ouest du Missouri. Les caryotypes et la longueur totale nous ont servi pour les identifications de terrain et une analyse du polymorphisme des longueurs des segments amplifiés (AFLP) a permis de confirmer les identifications de terrain et de déterminer l'importance de l'hybridation. Des 179 spécimens, 178 ont été identifiés à l'espèce. La seule exception avait un caryotype de B. brevicauda (2n = 50, FN = 48); cependant l'analyse de ALFP indique que cet individu est vraisemblablement un hybride de F1. Comme il n'y a aucune indication de rétrocroisement, l'introgression semble minimale. L'hybride putatif a été piégé dans une localité contenant B. brevicauda située juste au nord d'une localité où vit seulement B. hylophaga. Aucune localité ne contient les deux espèces. Les deux espèces ne possèdent donc pas une importante zone de sympatrie, comme on le croyait; ils ont plu...

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Section: Introductioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification and characterization of the contact zone between short-tailed shrews (Blarina) in Iowa and Missouri

et al. 2011

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Molecular Phylogeny of Short-Tailed Shrews, Blarina (Insectivora: Soricidae)

Brant

Ortı́

2002

Molecular Phylogenetics and Evolution

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Intra- and interspecific morphological variation in sympatric and allopatric populations of Mustela putorius and M. eversmanii (Carnivora: Mustelidae) and detection of potential hybrids

et al. 2020

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European mustelids include the European polecat, Mustela putorius, and the steppe polecat, M. eversmanii. Both occur sympatrically in the Pannonian Basin, where M. eversmanii hungarica represents the westernmost part of the latter species and they allegedly hybridize. We investigated the morphological relationships in sympatric and allopatric populations of these mustelids with representative sampling, taxonomic and geographic coverage. We evaluated inter- and intraspecific patterns of morphological differentiation of 20 cranial measurements and four external traits by distance-based morphometric approaches and multivariate analyses. Our results revealed a considerable heterogeneity in cranial morphology. The two species appeared to be clearly differentiated although sympatric populations were closer to each other and had a slight overlap in the morphometric space. Within M. eversmanii, the subspecies and the nominal taxon only partially overlapped, and M. eversmanii eversmanii was more distant from M. putorius than subspecies hungarica. Although morphometric analyses revealed several intermediate individuals in size in sympatric M. eversmanii and M. putorius populations, only a small fraction of such specimens showed conflict in discrete morphological characters with the diagnostic discriminant function. We interpret these results as an indication of ongoing hybridisation between sympatric populations, but the low number of hybrids identified suggests limited genetic exchange between the species.

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Morphological and Mitochondrial DNA Variation in a Hybrid Zone Between Short-Tailed Shrews (Blarina) in Nebraska

Cited by 9 publications

References 46 publications

Identification and characterization of the contact zone between short-tailed shrews (Blarina) in Iowa and Missouri

Identification and characterization of the contact zone between short-tailed shrews (Blarina) in Iowa and Missouri

Molecular Phylogeny of Short-Tailed Shrews, Blarina (Insectivora: Soricidae)

Intra- and interspecific morphological variation in sympatric and allopatric populations of Mustela putorius and M. eversmanii (Carnivora: Mustelidae) and detection of potential hybrids

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