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近期同域分布物种暗果蝇和拟暗果蝇的种间实验室竞争

INTERSPECIFIC LABORATORY COMPETITION OF THE RECENTLY SYMPATRIC SPECIES DROSOPHILA SUBOBSCURA AND DROSOPHILA PSEUDOOBSCURA.

作者信息

Pascual Marta, Serra Luis, Ayala Francisco J

机构信息

Department of Ecology and Evolutionary Biology, University of California, Irvine, California, 92717.

Departament de Genètica, Universitat de Barcelona, 08071, Barcelona, Spain.

出版信息

Evolution. 1998 Feb;52(1):269-274. doi: 10.1111/j.1558-5646.1998.tb05162.x.

Abstract

-Drosophila subobscura and D. pseudoobscura are closely related species coexisting on the West Coast of North America, which was recently colonized by D. subobscura. In competition experiments with overlapping generations, D. subobscura is eliminated by D. pseudoobscura in a few generations at all four temperatures and two initial frequencies tested. Yet in one-species cultures, D. subobscura thrives at all experimental conditions. Single-generation competition experiments reveal lower survivorship and productivity of D. subobscura at all temperatures and frequencies. Productivity per female is dependent on the initial frequencies: greater for D. subobscura as its initial frequency becomes higher, but lower for D. pseudoobscura as its frequency becomes higher. Strains of D. subobscura from three disparate geographic origins yield similar results.

摘要
  • 暗果蝇和拟暗果蝇是在北美西海岸共存的近缘物种,暗果蝇最近才在该地区定殖。在重叠世代的竞争实验中,在所有测试的四个温度和两个初始频率下,暗果蝇在几代内就被拟暗果蝇淘汰。然而在单物种培养中,暗果蝇在所有实验条件下都能茁壮成长。单代竞争实验表明,在所有温度和频率下,暗果蝇的存活率和繁殖力都较低。每只雌蝇的繁殖力取决于初始频率:暗果蝇的初始频率越高,繁殖力越大;而拟暗果蝇的频率越高,繁殖力越低。来自三个不同地理起源的暗果蝇品系产生了相似的结果。

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