Karyotypes of four Chinese species of field mice of the genus Apodemus were examined,including Apodemus chevrieri （diploid chromosome number,2n=48,fundamental number of autosomal arms,FNa=56）,A.draco （2n=48,FNa=48...Karyotypes of four Chinese species of field mice of the genus Apodemus were examined,including Apodemus chevrieri （diploid chromosome number,2n=48,fundamental number of autosomal arms,FNa=56）,A.draco （2n=48,FNa=48）,A.ilex （2n=48,FNa=48）,and A.latronum （2n=48,FNa=48）.Karyotypes of A.chevrieri,A.draco,and A.ilex are reported here for the first time,providing useful information for their species taxonomy.Determining the karyotypes of all species of Apodemus in Asia,both in this and previous studies,provides a solid overview of the chromosome evolution and species differentiation of the genus in East Asia.In addition to allopatric speciation,chromosome rearrangements likely played an important role in the formation of the four Apodemus species groups as well as speciation within each group in East Asia.For example,increased centromeric heterochromatin in A.latronum may have contributed to the post-mating reproductive isolation from the A.draco-A.ilex-A.semotus clade.展开更多
The karyotypes of three shrew species(Mammalia,Soricomorpha,Soricidae)from Nepal were examined for the first time.Based on the karyotypes and overall differences in skull size,the current Episoriculus caudatus appeare...The karyotypes of three shrew species(Mammalia,Soricomorpha,Soricidae)from Nepal were examined for the first time.Based on the karyotypes and overall differences in skull size,the current Episoriculus caudatus appeared to include two distinct species:the larger E.caudatus and the smaller Episoriculus sacratus.Episoriculus sacratus has three subspecies,E.s.soluensis in Nepal and Sikkim,E.s.umbrinus in Assam,Myanmar and the Yunnan Province of China,and E.s.sacratus in the Sichuan Province of China.Soriculus nigrescens had a diploid chromosome number(2n)and fundamental number(FN),including two X chromosomes,of 64 and 92,respectively,consisting of 11 metacentric or submetacentric,two subtelocentric and 18 acrocentric pairs of autosomes,a metacentric X and an acrocentric Y chromosome.Episoriculus sacratus soluensis had 2n=74 and FN=126,consisting of 12 metacentric or submetacentric,13 subtelocentric and 11 acrocentric pairs of autosomes,a submetacentric X and an acrocentric Y chromosome.Episoriculus caudatus had 2n=60 and FN=118,consisting of 19 metacentric or submetacentric,nine subtelocentric and one acrocentric pair of autosomes,a subtelocentric X and an acrocentric Y chromosome.The karyotypes of these three species are characterized by their large 2n and FN values compared with other Soricidae.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)Major International(Regional)Joint Research Project Grant(31110103910)National Basic Research Program of China(2013FY111500)+1 种基金JSPS KAKENHI grant JP18H03602JSPS Core-to-Core Program B.Asia Africa Science Platforms
文摘Karyotypes of four Chinese species of field mice of the genus Apodemus were examined,including Apodemus chevrieri （diploid chromosome number,2n=48,fundamental number of autosomal arms,FNa=56）,A.draco （2n=48,FNa=48）,A.ilex （2n=48,FNa=48）,and A.latronum （2n=48,FNa=48）.Karyotypes of A.chevrieri,A.draco,and A.ilex are reported here for the first time,providing useful information for their species taxonomy.Determining the karyotypes of all species of Apodemus in Asia,both in this and previous studies,provides a solid overview of the chromosome evolution and species differentiation of the genus in East Asia.In addition to allopatric speciation,chromosome rearrangements likely played an important role in the formation of the four Apodemus species groups as well as speciation within each group in East Asia.For example,increased centromeric heterochromatin in A.latronum may have contributed to the post-mating reproductive isolation from the A.draco-A.ilex-A.semotus clade.
文摘The karyotypes of three shrew species(Mammalia,Soricomorpha,Soricidae)from Nepal were examined for the first time.Based on the karyotypes and overall differences in skull size,the current Episoriculus caudatus appeared to include two distinct species:the larger E.caudatus and the smaller Episoriculus sacratus.Episoriculus sacratus has three subspecies,E.s.soluensis in Nepal and Sikkim,E.s.umbrinus in Assam,Myanmar and the Yunnan Province of China,and E.s.sacratus in the Sichuan Province of China.Soriculus nigrescens had a diploid chromosome number(2n)and fundamental number(FN),including two X chromosomes,of 64 and 92,respectively,consisting of 11 metacentric or submetacentric,two subtelocentric and 18 acrocentric pairs of autosomes,a metacentric X and an acrocentric Y chromosome.Episoriculus sacratus soluensis had 2n=74 and FN=126,consisting of 12 metacentric or submetacentric,13 subtelocentric and 11 acrocentric pairs of autosomes,a submetacentric X and an acrocentric Y chromosome.Episoriculus caudatus had 2n=60 and FN=118,consisting of 19 metacentric or submetacentric,nine subtelocentric and one acrocentric pair of autosomes,a subtelocentric X and an acrocentric Y chromosome.The karyotypes of these three species are characterized by their large 2n and FN values compared with other Soricidae.
