Stratton Gail E, Uetz George W
Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, 45221.
Evolution. 1986 Jan;40(1):129-141. doi: 10.1111/j.1558-5646.1986.tb05724.x.
The courtship behaviors of two morphologically similar spider species, Schizocosa ocreata and S. rovneri, are distinctive and prevent interbreeding. We used "forced" copulation between these species to investigate the mode of inheritance of the courtship behavior and to determine whether postmating isolating mechanisms exist. F hybrids proved to be behaviorally sterile, but they were capable of producing viable offspring when forced to interbreed. Analysis of the courtship behaviors of F , F , and backcross progeny showed that the inheritance of some aspects of these behaviors is consistent with models involving single autosomal loci. The inheritance of secondary sexual characteristics in the males is also investigated. The genes for courtship behavior and secondary sexual characteristics do not assort independently. The origin of the premating isolating mechanisms may be explained by either an initial habitat separation between the two groups, or by a founding event with each group subsequently diverging in slightly different habitats. It is suggested that the differences in the microhabitats may have a profound effect on what type of signal (visual or vibratory) would be effective.
两种形态相似的蜘蛛物种，即奥氏裂腹蛛（Schizocosa ocreata）和罗夫纳氏裂腹蛛（S. rovneri）的求偶行为具有独特性，可防止杂交。我们利用这两个物种之间的“强制”交配来研究求偶行为的遗传模式，并确定交配后隔离机制是否存在。F代杂种被证明行为上不育，但当被迫杂交时，它们能够产生可存活的后代。对F、F和回交后代的求偶行为分析表明，这些行为某些方面的遗传与涉及单个常染色体基因座的模型一致。同时也研究了雄性第二性征的遗传。求偶行为和第二性征的基因并非独立分配。交配前隔离机制的起源可以通过两组之间最初的栖息地分离来解释，或者通过一个奠基事件来解释，随后每组在略有不同的栖息地中分化。有人认为，微生境的差异可能会对何种类型的信号（视觉或振动）有效产生深远影响。
