Karyotypic Relationships within the Short-Tailed Shrews, Genus Blarina

George, Sarah B.; Genoways, Hugh H.; Choate, Jerry R.; Baker, Robert J.

doi:10.2307/1380269

Cited by 28 publications

(43 citation statements)

References 12 publications

(5 reference statements)

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“…Karyotypes were essential for positive field identification of species (Genoways et al 1977;George et al 1982;Thompson and Hoffman 2009). Only those individuals that were alive within a half hour prior to karyotyping or were still warm to the touch were karyotyped.…”

Section: Field Identificationmentioning

confidence: 99%

“…1. Currently known geographic distributions of the northern short-tailed shrew (Blarina brevicauda) and Elliot's short-tailed shrew (Blarina hylophaga) in North America (George et al 1982;Moncrief et al 1982;Reilly et al 2005). The distributions of both species, as well as the sympatric overlap of the distributions within Iowa and Missouri, are indicated in the map legend.…”

Section: Aflp Analysismentioning

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%

“…This lack of introgression might be due to differences in the number of Robertsonian polymorphisms that occurs within B. brevicauda and B. hylophaga (Meylan 1967;Lee and Zimmerman 1969;Genoways et al 1977;George et al 1982;Oshida et al 2003), which likely reduces fitness (Searle 1993). Several hybrid zone studies have documented limited introgression between species with chromosomal rearrangements (Bradley et al 1991;Basset et al 2007;Genoways et al 2008).…”

Section: Extent Of Hybridization and Introgressionmentioning

confidence: 99%

“…Problems during the pairing and segregation phases of meiosis caused by increased chromosomal heterozygosity can reduce hybrid fitness (Baker and Bickham 1986). This explanation seems highly plausible given the number of Robertsonian polymorphisms that occurs within B. brevicauda and B. hylophaga (Meylan 1967;Lee and Zimmerman 1969;Genoways et al 1977;George et al 1982;Oshida et al 2003;Thompson and Hoffman 2009). Thus, the chromosomal rearrangements between B. brevicauda and B. hylophaga might be a strong isolating mechanism (Shaw et al 1993;Benedict et al 2006).…”

Section: Extent Of Hybridization and Introgressionmentioning

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: Field Identificationmentioning

confidence: 99%

Section: Aflp Analysismentioning

confidence: 99%