Robinson T J, Elder F F, Chapman J A
Cytogenet Cell Genet. 1984;38(4):282-9. doi: 10.1159/000132076.
Chromosomes from cultured fibroblasts of four cottontail species (Sylvilagus audubonii, 2n = 42; S. idahoensis, 2n = 44; S. nuttallii, 2n = 42; and S. palustris, 2n = 38) were analyzed using G- and C-banding techniques. The evolutionary restructuring of the genomes of these species was traced by comparing their banded chromosomes to those of Lepus saxatilis, a species of hare in which the leporid ancestral karyotype is thought to have been conserved. Chromosomal evolution appears to have proceeded primarily through changes in the amount and distribution of heterochromatin and through fixation of Robertsonian fusions. Excluding heterochromatic differences, S. audubonii and S. nuttallii are karyotypically very similar, as are S. aquaticus and S. palustris (previously reported). The genome of the taxonomically controversial species S. idahoensis, compared to other cottontail species, is markedly impoverished in C-band material. These data and those of cottontail species previously described in the literature are incorporated in two alternative phylogenetic schemes.
利用G带和C带技术分析了四种棉尾兔（奥杜邦棉尾兔，2n = 42；爱达荷棉尾兔，2n = 44；纳氏棉尾兔，2n = 42；沼泽棉尾兔，2n = 38）培养成纤维细胞的染色体。通过将这些物种的带型染色体与岩兔（一种野兔，其核型被认为保留了兔科祖先核型）的带型染色体进行比较，追踪了这些物种基因组的进化重组。染色体进化似乎主要通过异染色质数量和分布的变化以及罗伯逊融合的固定来进行。排除异染色质差异，奥杜邦棉尾兔和纳氏棉尾兔的核型非常相似，水栖棉尾兔和沼泽棉尾兔（先前报道）也是如此。与其他棉尾兔物种相比，分类学上有争议的爱达荷棉尾兔的基因组在C带物质方面明显贫乏。这些数据以及文献中先前描述的棉尾兔物种的数据被纳入了两种不同的系统发育方案中。
