Craighead L, Paetkau D, Reynolds H V, Vyse E R, Strobeck C
Department of Biology, Montana State University, Bozeman 59717, USA.
J Hered. 1995 Jul-Aug;86(4):255-61. doi: 10.1093/oxfordjournals.jhered.a111578.
We report data from analyses of microsatellite loci of 30 grizzly bear family groups which demonstrate that each cub in a litter can be sired independently, and we derive estimates of maximum reproductive success for males, from an Arctic population in northwestern Alaska that is minimally affected by human activities. These analyses were made possible by the use of single-locus primers that amplified both of an individual's alleles at eight microsatellite loci and by detailed knowledge of maternal/offspring relationships that allowed the identification of paternal alleles. No single male was responsible for more than approximately 11% of known offspring, and no more than 49% of breeding-age males successfully bred. These data contribute to an understanding of the genetic and demographic basis of male reproductive success, which is of vital importance in the maintenance of small, isolated grizzly bear populations.
我们报告了对30个灰熊家族群体微卫星位点的分析数据，这些数据表明一窝幼崽中的每只幼崽都可能由不同的雄性受精。我们还从阿拉斯加西北部受人类活动影响最小的北极种群中得出了雄性最大繁殖成功率的估计值。这些分析得以进行，是因为使用了能在8个微卫星位点扩增个体两个等位基因的单一位点引物，以及通过对母系/后代关系的详细了解从而能够识别父系等位基因。没有任何一只雄性对超过约11%的已知后代负责，且成功繁殖的育龄雄性不超过49%。这些数据有助于理解雄性繁殖成功的遗传和人口统计学基础，这对于维持小型、孤立的灰熊种群至关重要。
