Isolation effect in narrow hybrid zones of Sorex araneus chromosome races

Grigoryeva, O. O.; Shestak, Anna; Сычева, В. Б.; Potapov, S. G.; Borisov, Yu. M.; Орлов, В. Н.

doi:10.1134/s1607672911010133

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Previous morphometric studies have looked at morphometric variation in pure and hybrid race individuals at selected hybrid zones [43]–[47], others have looked at phenotypic variation across large segments of the species' range [48]–[50], and a few have looked at morphometric differences between hybridizing sister species of the S. araneus group [51]–[53]. While phenotypic clines have never been studied directly in S. araneus , these previous studies suggest that phenotypic differentiation between races is often small but statistically significant, that differentiation at the population level is often greater than differentiation between races, as with genetic markers, and that phenotypic differentiation between groups of races can be as large as between sister species.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic Variation across Chromosomal Hybrid Zones of the Common Shrew (Sorex araneus) Indicates Reduced Gene Flow

et al. 2013

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Sorex araneus, the Common shrew, is a species with more than 70 karyotypic races, many of which form parapatric hybrid zones, making it a model for studying chromosomal speciation. Hybrids between races have reduced fitness, but microsatellite markers have demonstrated considerable gene flow between them, calling into question whether the chromosomal barriers actually do contribute to genetic divergence. We studied phenotypic clines across two hybrid zones with especially complex heterozygotes. Hybrids between the Novosibirsk and Tomsk races produce chains of nine and three chromosomes at meiosis, and hybrids between the Moscow and Seliger races produce chains of eleven. Our goal was to determine whether phenotypes show evidence of reduced gene flow at hybrid zones. We used maximum likelihood to fit tanh cline models to geometric shape data and found that phenotypic clines in skulls and mandibles across these zones had similar centers and widths as chromosomal clines. The amount of phenotypic differentiation across the zones is greater than expected if it were dissipating due to unrestricted gene flow given the amount of time since contact, but it is less than expected to have accumulated from drift during allopatric separation in glacial refugia. Only if heritability is very low, Ne very high, and the time spent in allopatry very short, will the differences we observe be large enough to match the expectation of drift. Our results therefore suggest that phenotypic differentiation has been lost through gene flow since post-glacial secondary contact, but not as quickly as would be expected if there was free gene flow across the hybrid zones. The chromosomal tension zones are confirmed to be partial barriers that prevent differentiated races from becoming phenotypically homogenous.

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Section: Introductionmentioning

confidence: 99%

Phenotypic Variation across Chromosomal Hybrid Zones of the Common Shrew (Sorex araneus) Indicates Reduced Gene Flow

et al. 2013

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“…The number of alleles per one locus ranges from 2 to 11, an average of 7. These values significantly exceed those of the common shrew in the European part of Russia, where the similar characteristics varied within 2-5 [12].…”

Section: Resultsmentioning

confidence: 56%

“…The indicators of expected and observed heterozygosity also reach rather high values. Similarly with the frequency of alleles at a locus, this characteristic in S. satunini also significantly exceeds those in S. araneus [12]. It should be noted that for a number of loci the level of observed heterozygosity is higher than it was expected.…”

Section: Resultsmentioning

confidence: 73%

Genetic Variability and Structure of the Caucasian Shrew Sorex satunini in the North Caucasus according to the Variability of Microsatellite Loci

et al. 2020

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The variability of the microsatellite loci of the Caucasian shrew Sorex satunini in the North Caucasus was evaluated. It was shown that this species on this territory is represented by two discrete genetic lines associated with the basins of the Kuban and Terek rivers. The genetic diversity of the Caucasian shrew from the line of the Kuban River basin is characterized by a significantly higher polymorphism compared to the line from the Terek River basin. These differences are associated with both modern habitat conditions of S. satunini and the history of this species in the Western and Central Caucasus.

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Geometric Morphometric Tests for Phenotypic Divergence Between Chromosomal Races

Polly¹,

Wójcik²

2019

Shrews, Chromosomes and Speciation

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Isolation effect in narrow hybrid zones of Sorex araneus chromosome races

Cited by 4 publications

References 9 publications

Phenotypic Variation across Chromosomal Hybrid Zones of the Common Shrew (Sorex araneus) Indicates Reduced Gene Flow

Phenotypic Variation across Chromosomal Hybrid Zones of the Common Shrew (Sorex araneus) Indicates Reduced Gene Flow

Genetic Variability and Structure of the Caucasian Shrew Sorex satunini in the North Caucasus according to the Variability of Microsatellite Loci

Geometric Morphometric Tests for Phenotypic Divergence Between Chromosomal Races

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