Characteristics of a Hybrid Zone Between Two Species of Short-Tailed Shrews (Blarina)

Benedict, Russell A.

doi:10.2307/1383214

Cited by 7 publications

(29 citation statements)

References 18 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%

“…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%

“…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). Wherever the distributions of these species approach, they exhibit parapatric relationships with little overlap at contact zones and little or no hybridization (Genoways and Choate 1972;Graham and Semken 1976;Bowles 1977;Ellis et al 1978;Tate et al 1980;Braun and Kennedy 1983;Jones et al 1984;Benedict 1999b;Brant and Ortí 2002).…”

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: 99%

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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Phylogeography of the Northern short‐tailed shrew, Blarina brevicauda (Insectivora: Soricidae): past fragmentation and postglacial recolonization

Brant

Ortı́

2003

Molecular Ecology

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Blarina brevicauda is distributed across the northeastern region of North America, in areas previously covered by Pleistocene glaciers. Previous molecular systematic study of the species in the genus Blarina suggested the presence of two distinct eastern and western phylogroups within B. brevicauda, in agreement with traditionally recognized semi-species. To expand the previous work, a collection of 76 individuals from 14 localities collected throughout the range of B. brevicauda was used to assess the mitochondrial (mt) cytochrome b genealogy for this species. Minimum evolution, maximum parsimony, analysis of molecular variance and nested clade analysis each supported the same conclusions of two well-differentiated and monophyletic east-west groups, separated by the Mississippi River. Denser sampling in areas immediately East of the Mississippi basin revealed further subdivision within the eastern phylogroup into an East-Central and an Appalachian clade. The western phylogroup differed from the eastern phylogroup by 2.5% mean absolute DNA sequence difference. About 65% of the genetic variance among samples was explained by the east-west subdivision alone. High haplotype diversities, low nucleotide diversities and unimodal mismatch distributions within subclades suggest recent expansion or diversification within each group. No phylogeographic structure was found within the western phylogroup, but genetic structure because of restricted gene flow and isolation by distance was inferred for the eastern group. The present distribution of B. brevicauda is best explained by past fragmentation and range expansion events during and following the Pleistocene glacial cycles.

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Characteristics of a Hybrid Zone Between Two Species of Short-Tailed Shrews (Blarina)

Cited by 7 publications

References 18 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)

Phylogeography of the Northern short‐tailed shrew, Blarina brevicauda (Insectivora: Soricidae): past fragmentation and postglacial recolonization

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