PATTERNS OF SPECIATION IN DROSOPHILA
PATTERNS OF SPECIATION IN DROSOPHILA
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DOI：
10.2307/2409213
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发表时间：
1989-03-01
期刊：
影响因子：
3.3
通讯作者：
ORR, HA
中科院分区：
文献类型：
--
作者：
COYNE, JA;ORR, HA
为了研究物种形成的时间进程，我们收集了119对密切相关的果蝇物种的文献数据，这些物种的遗传距离、交配鉴别力、杂交不育和不存活的强度以及地理范围都是已知的。由于遗传距离与分化时间相关，这些数据提供了物种形成不同阶段的分类群横截面。随着时间的推移，交配歧视和杂交种的不育性或不成活率逐渐增加。杂交不育和不育以相似的速度进化。在异地物种中，交配歧视和合子后隔离以类似的速度进化，但在共生物种中，强烈的交配歧视出现在严重不育或丧失生存能力之前。这表明当异地类群成为共生类群时，前合子生殖隔离可能会得到加强。对合子后隔离进化的分析表明，最近分化的分类群通常产生不育或不能存活的雄性，但不产生雌性杂种。此外，在雄性受限和雌性杂交不育或不育的进化之间存在着很大的时间差距。这一差距被最近的物种形成遗传学理论预测，解释了为什么杂交产生男性有限的杂交不育或不能生存的压倒性优势(霍尔丹的S规则)。
To investigate the time course of speciation, we gathered literature data on 119 pairs of closely related Drosophila species with known genetic distances, mating discrimination, strength of hybrid sterility and inviability, and geographic ranges. Because genetic distance is correlated with divergence time, these data provide a cross-section of taxa at different stages of speciation. Mating discrimination and the sterility or inviability of hybrids increase gradually with time. Hybrid sterility and inviability evolve at similar rates. Among allopatric species, mating discrimination and postzygotic isolation evolve at comparable rates, but among sympatric species strong mating discrimination appears well before severe sterility or inviability. This suggests that prezygotic reproductive isolation may be reinforced when allopatric taxa become sympatric. Analysis of the evolution of postzygotic isolation shows that recently diverged taxa usually produce sterile or inviable male but not female hybrids. Moreover, there is a large temporal gap between the evolution of male-limited and female hybrid sterility or inviability. This gap, which is predicted by recent theories about the genetics of speciation, explains the overwhelming preponderance of hybridizations yielding male-limited hybrid sterility or inviability (Haldane''s rule).