The karyotype of Pipistrellus abramus

The karyotype of Pipistrellus abramus from Hainan Island was 2n = 26, FN = 44 (Fig. 5), consisting of ten large to medium-sized metacentric or submetacentric pairs and two small acrocentric pairs in autosomes, a medium-sized acrocentric X chromosome, and the smallest acrocentric Y chromosome. The conventionally stained karyotype of P. abramus from Hainan Island does not differ from conspecific populations from the Chinese provinces of Zhejiang, Henan, and Sichuan, Taiwan, Japan, or Korea [8, 14, 37 - 43]. Large negative G-band and positive C-band areas were found in the pericentromeric regions of chromosome 1 through 4, 10, 11 and X; and these are considered centromeric constitutive heterochromatin. This characteristic was also reported from Japan and Taiwan [38, 41, 42], and any difference in G- and C-banding patterns among populations from Hainan Island, Japan and Taiwan was detected.