STRUCTURE OF AN ASYMMETRIC HYBRID ZONE BETWEEN TWO WATER STRIDER SPECIES (HEMIPTERA: GERRIDAE: LIMNOPORUS)
STRUCTURE OF AN ASYMMETRIC HYBRID ZONE BETWEEN TWO WATER STRIDER SPECIES (HEMIPTERA: GERRIDAE: LIMNOPORUS)
复制标题
两种水黾物种之间的不对称杂种带结构（半翅目：鹩科：软孔菌）
DOI：
10.1111/j.1558-5646.1991.tb02642.x
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
J. Spence
中科院分区：
文献类型：
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作者：
F. Sperling;J. Spence
在加拿大西部的一大片区域内，水环境较为严苛的物种Dissortis Limnporus dissortis和L.notabilis杂交生长。在阿尔伯塔省西部落基山脉的东坡，4个等位酶座位的体长和等位基因显示出陡峭的倾角，而在不列颠哥伦比亚省中部，亲本表型共存，但没有完全融合。一个与性别相关的基因座几乎没有表现出渐渗，而在三个常染色体基因座上明显有相当大的基因流。虽然杂交带具有宽张力带的特征，但渐渗的空间分布表明，两个物种的生境斑块和不同的生境关联度也有助于形成杂交格局。种间交配成功率的不对称性以及性染色体之间或性染色体与细胞质因子的不亲和性似乎是导致白粉病在白粉菌范围内出现的原因，也是白粉菌在白粉菌范围内缺乏的主要原因。这一杂交区的遗传结构支持性别连锁性状在维持物种完整性方面的重要性，而其空间结构表明，外部栖息地特征可以与内在的遗传不亲和性相结合，产生复杂的杂交相互作用。
The water stricter species Limnoporus dissortis and L. notabilis hybridize across a broad zone in western Canada. Body length and alleles at four allozyme loci show a steep cline along the east slope of the Rocky Mountains in western Alberta, while in central British Columbia the parental phenotypes coexist without merging fully. One sex‐linked locus shows little introgression, while there is apparently considerable gene flow at three autosomal loci. Although the hybrid zone has characteristics of a broad tension zone, the spatial distribution of introgression suggests that habitat patchiness and differential habitat associations of the two species also contribute to the pattern of hybridization. Asymmetry in interspecific mating success and incompatibilities of sex chromosomes with each other or with cytoplasmic factors appear to account for the occurrence of L. dissortis genotypes within the range of L. notabilis, and the lack of L. notabilis genotypes within the range of L. dissortis. The genetic structure of this hybrid zone supports the importance of sex‐linked traits in maintaining the integrity of species, while its spatial structure suggests that extrinsic habitat features can combine with intrinsic genetic incompatibilities to produce complex hybrid interactions.