| [the microsatellite polymorphism and gene flow in the contact zone of four common shrew (sorex araneus l., mammalia) chromosome races]. | the variation of microsatellite loci in 130 individuals of four common shrew chromosome races (moscow, western dvina, seliger, and st. petersburg) contacting on the valdai hills was studied. a low level of genetic differences between the chromosome races, which differ at three-five fixed diagnostic metacentric chromosomes, was found. the genetic differentiation within the races is more considerable as compared with that between the races. a high deficiency in heterozygotes was recorded; presumab ... | 2016 | 22117416 |
| [narrow hybrid zone between moscow and western dvina chromosomal races and specific features of population isolation in common shrew sorex araneus (mammalia)]. | the contact zone between moscow and western dvina chromosomal races of common shrew sorex araneus l. at the south of the valdai hights was traced over a distance of 20 km. within this, close to parapatric, contact zone of chromosomal races the width of sympatry zone was about 500 m (the narrowest among currently known hybrid zones), and the proportion of hybrids was 24.3%. it was shown that in bimodal hybrid zones between chromosomal races of common shrew the width of sympatry zones varied from ... | 2012 | 22567857 |
| [craniometric differences between karyotypic races of the common shrew sorex araneus (mammalia) as a result of limited hybridization]. | the contact points of four karyotypic races (st. petersburg, moscow, seliger and west dvina) of the common shrew sorex araneus l. were studied at the valdai hills (european russia) in an area unimpeded by geographic barriers. the populations of the races are separated by narrow hybrid zones that represent the most complex heterozygous hybrid karyotypes. at these points of contact, the morphometric differentiation of karyotype races was examined in 12 cranial measurements in 190 shrews of a known ... | 2013 | 23866625 |
| phenotypic variation across chromosomal hybrid zones of the common shrew (sorex araneus) indicates reduced gene flow. | 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. ... | 2013 | 23874420 |
| cytogenetic analysis of a hybrid zone between the moscow and neroosa races of the common shrew (sorex araneus) differing by a single wart-like chromosome rearrangement. | three karyotypic variants were revealed in the moscow-neroosa chromosomal hybrid zone by comparative cytogenetic analysis: homozygotes of the pure parental races and complex heterozygotes (f1 hybrids). as expected, a ring-of-four configuration (riv) was observed in diakinesis spreads of hybrids. no disturbances in the structure of the riv were found. distribution of telomeric repeats and rdna on the chromosomes of an individual of the neroosa race were studied using dual-colour fish. | 2013 | 23875464 |
| natural hybridization between extremely divergent chromosomal races of the common shrew (sorex araneus, soricidae, soricomorpha): hybrid zone in european russia. | the moscow and seliger chromosomal races of the common shrew differ by robertsonian fusions and possibly whole-arm reciprocal translocations (warts) such that their f₁ hybrids produce a chain-of-eleven configuration at meiosis i and are expected to suffer substantial infertility. of numerous hybrid zones that have been described in the common shrew, those between the moscow and seliger races involve the greatest chromosomal difference. we collected 211 individuals from this zone to generate a to ... | 2010 | 21159004 |
| hybridization of the common shrew (sorex araneus l.) chromosomal races moscow and seliger: the probability of crossing and survival of hybrids. | | 2007 | 18274499 |
| [wild small mammals are the reservoir hosts of the bartonella genus bacteria in the south of moscow region]. | a total of 103 blood samples collected from wild small mammals captured in the prioksko-terrasny reserve on the south of moscow region were studied to determine the bartonellae prevalence. the examined species were the yellow-necked mice apodemus flavicollis (35 samples), the european wood mouse apodemus uralensis (10 samples), the bank vole clethrionomys glareolus (51 samples), the house mouse mus musculus (3 samples), the common vole microtus arvalis (2 samples), and the shrew sorex araneus (2 ... | 2006 | 17094651 |
| [distribution of two chromosome races of the common shrew (sorex araneus l.) in the hybrid zone: may a change of the dispersal mode maintain independent gene frequencies?]. | combination of different dispersal modes may itself, without external obstacles, lead to the appearance of subdivided populations and maintain the existence of independent population systems. the common shrew, a mammal convenient for studying different levels of intraspecific differentiation, was the object of the study. empirical data have been used for simulation taking into account the change of dispersal modes in the population area. the obtained results agree with empirical data on the dist ... | 2008 | 18727383 |
| [cytogenetic control of a hybrid zone of between two sorex araneus chromosome races before breeding season]. | two chromosome races of common shrew, moscow and seliger, differ in the arm combination in 11 diagnostic chromosomes (robertsonian metacentrics/acrocentrics). homozygotes of both pure races, simple robertsonian heterozygotes of seliger race, and complex heterozygotes (fi hybrids) were detected in the found earlier between hybrid zone of these races, in the spring before the breeding seasonbreeding season. the g/oheterozygote was first discovered in race seliger, whose chromosome formula typicall ... | 2007 | 18592688 |
| [molecular variability in the commom shrew sorex araneus l. from european russia and siberia inferred from the length polymorphism of dna regions flanked by short interspersed elements (inter-sine pcr) and the relationships between the moscow and seliger chromosome races]. | genetic exchange among chromosomal races of the common shrew sorex araneus and the problem of reproductive barriers have been extensively studied by means of such molecular markers as mtdna, microsatellites, and allozymes. in the present study, the interpopulation and interracial polymorphism in the common shrew was derived, using fingerprints generated by amplified dna regions flanked by short interspersed repeats (sines)-intersine pcr (is-pcr). we used primers, complementary to consensus seque ... | 2006 | 16871777 |