Corbet S W, Grant W S, Robinson T J
Mammal Research Institute, University of Pretoria, South Africa.
J Hered. 1994 Nov-Dec;85(6):479-83. doi: 10.1093/oxfordjournals.jhered.a111504.
Genetic variability within the blue (Connochaetes taurinus) and black (C. gnou) wildebeests in South Africa was estimated from allozyme frequencies at 31 protein-encoding loci. Seven loci, Ak-1, Alb, Est-D, Icdh-1, Mpi-1, Pgm-1, and Tf, were polymorphic in the blue wildebeest, but only two loci, Est-D and Tf, were variable in its congener. Average gene diversity was H = 0.018 +/- 0.013 in the black wildebeest and was significantly smaller than that, H = 0.081 +/- 0.030, in the blue wildebeest. The reduced level of heterozygosity in black wildebeest is most likely due to a bottleneck in population size in the early 1900s. The genetic distance between the two species was 0.059 +/- 0.027, which is consistent with an estimate of low mtDNA sequence divergence found previously.
通过对31个蛋白质编码位点的等位酶频率进行估算，得出了南非蓝角马（牛羚属）和黑角马（牛羚属）的遗传变异性。在蓝角马中，Ak-1、Alb、Est-D、Icdh-1、Mpi-1、Pgm-1和Tf这7个位点具有多态性，但在其同属的黑角马中只有Est-D和Tf这两个位点具有变异性。黑角马的平均基因多样性为H = 0.018 ± 0.013，显著低于蓝角马的H = 0.081 ± 0.030。黑角马杂合性水平降低很可能是由于20世纪初种群数量瓶颈所致。两个物种之间的遗传距离为0.059 ± 0.027，这与之前发现的低线粒体DNA序列差异估计结果一致。
