Wang Han, McArthur E Durant, Sanderson Stewart C, Graham John H, Freeman D Carl
Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202.
USDA Forest Service, Intermountain Research Station, Shrub Sciences Laboratory, 735 North 500 East, Provo, Utah, 84606.
Evolution. 1997 Feb;51(1):95-102. doi: 10.1111/j.1558-5646.1997.tb02391.x.
Does endogenous or exogenous selection stabilize the big sagebrush (Artemisia tridentata) hybrid zone? After two years of study, our reciprocal transplant experiments showed significant genotype by environment interactions for a number of fitness components, including germination, growth, and reproduction. Hybrids were the most fit within the hybrid garden. In the parental gardens, the native parental taxon was more fit than either the alien parental or hybrids. These results are consistent with the bounded hybrid superiority model, which assumes exogenous selection, but are clearly at odds with the dynamic equilibrium model, which assumes endogenous selection and universal hybrid unfitness.
内源性或外源性选择会使大艾草（Artemisia tridentata）杂交带趋于稳定吗？经过两年的研究，我们的互交移植实验表明，在包括发芽、生长和繁殖在内的许多适合度组分上，基因型与环境之间存在显著的相互作用。杂种在杂交园内的适合度最高。在亲本园内，本地亲本分类群比外来亲本或杂种更具适合度。这些结果与假定外源性选择的有界杂种优势模型一致，但显然与假定内源性选择和杂种普遍不适合的动态平衡模型相悖。
