Roche Bernadette M, Fritz Robert S
Department of Biology, Vassar College, Poughkeepsie, New York, 12604.
Evolution. 1997 Oct;51(5):1490-1498. doi: 10.1111/j.1558-5646.1997.tb01472.x.
We measured resistance of Salix sericea, the silky willow, to a diverse assemblage of 12 herbivores. We investigated the potential for multispecies coevolution among these herbivores by measuring genetic correlations between pairs of herbivores interacting within the component community. After measuring herbivore attack on half-sib families of potted S. sericea during three years, we found significant narrow-sense heritabilities of resistance to Phyllonorycter salicifoliella and Phyllocnistis sp. in 1991. Thus, there is the potential for selection on resistance to these two herbivores. Despite the many significant phenotypic correlations between herbivore abundances within a year, most genetic correlations between herbivore abundances within a year were not significant. The genetic and phenotypic correlation structure varied from year to year in this three-year study. Thus, it appears that there is the potential for evolution of resistance to the two herbivores for which we found significant heritabilities, but multispecies coevolution seems unlikely.
我们测量了绢柳（Salix sericea）对12种不同食草动物组合的抗性。通过测量在组成群落中相互作用的成对食草动物之间的遗传相关性，我们研究了这些食草动物之间多物种共同进化的可能性。在对盆栽绢柳的半同胞家系进行了三年的食草动物攻击测量后，我们发现1991年对柳叶潜蛾（Phyllonorycter salicifoliella）和Phyllocnistis属某种昆虫的抗性存在显著的狭义遗传力。因此，存在对这两种食草动物抗性进行选择的可能性。尽管一年内食草动物数量之间存在许多显著的表型相关性，但一年内食草动物数量之间的大多数遗传相关性并不显著。在这项为期三年的研究中，遗传和表型相关结构每年都有所不同。因此，对于我们发现具有显著遗传力的两种食草动物，似乎存在抗性进化的可能性，但多物种共同进化似乎不太可能。
