寄主植物诱导的恩氏角蝉的选型交配

HOST-PLANT-INDUCED ASSORTATIVE MATING IN ENCHENOPA TREEHOPPERS.

作者信息

Wood Thomas K, Keese M C

机构信息

Department of Entomology and Applied Ecology, University of Delaware, Newark, DE, 19717-1303.

Department of Ecology and Evolution, State University of New York, Stony Brook, NY, 11794.

出版信息

Evolution. 1990 May;44(3):619-628. doi: 10.1111/j.1558-5646.1990.tb05942.x.

DOI:10.1111/j.1558-5646.1990.tb05942.x

PMID:28567985

Abstract

The hypothesis tested here is whether extrinsic host-plant-induced life-history timing and mating biology promote assortative mating along host-plant lines. In the arboreal, univoltine Enchenopa treehopper system, host plants mediate the timing and synchronization of egg hatch. The result is a uniform age structure with a restricted mating window during which females mate once. Enchenopa on host plants that differ in phenology have asynchronous life histories and mating windows, suggesting that temporal differences may promote assortative mating. To test this hypothesis, egg hatch of Enchenopa from the same host-plant species was manipulated to produce continuous adult age-classes. Under experimental conditions with no spatial barriers, mating occurred between individuals similar in age. The mechanism promoting this assortative mating is differential mortality in males and females, such that few males are still alive when females in successive age-classes mate. Such host-plant-induced assortative mating is viewed as an effective mechanism to protect the integrity of gene pools from migrants, permitting selection for host-plant-adapted genotypes and speciation.

摘要

此处所检验的假设是，外在的寄主植物诱导的生活史时间安排和交配生物学是否会促进沿寄主植物路线的选型交配。在树栖的、一年一代的恩氏角蝉系统中，寄主植物介导着卵孵化的时间和同步性。结果是形成了一个统一的年龄结构，交配窗口受限，在此期间雌性只交配一次。在物候不同的寄主植物上的恩氏角蝉具有不同步的生活史和交配窗口，这表明时间差异可能促进选型交配。为了检验这一假设，对来自同一寄主植物物种的恩氏角蝉的卵孵化进行了操控，以产生连续的成年年龄组。在没有空间障碍的实验条件下，年龄相近的个体之间发生了交配。促进这种选型交配的机制是雄性和雌性的不同死亡率，以至于当连续年龄组的雌性交配时，很少有雄性仍然存活。这种寄主植物诱导的选型交配被视为一种有效的机制，可保护基因库的完整性免受迁移者的影响，从而允许对适应寄主植物的基因型进行选择并促进物种形成。