Hybridization and introgression in a mixed population of the intertidal seaweeds Fucus evanescens and F-serratus
Hybridization and introgression in a mixed population of the intertidal seaweeds Fucus evanescens and F-serratus
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DOI：
10.1111/j.1420-9101.2007.01411.x
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发表时间：
2007-11-01
影响因子：
2.1
通讯作者：
Olsen, J. L.
中科院分区：
文献类型：
--
作者：
Coyer, J. A.;Hoarau, G.;Olsen, J. L.
引进的Eucus evanescens(两性)和本地的F.serratus(雌雄异株)沿着卡特加特海的丹麦海岸进行二次接触已有60-100年，在Blushoj观察到雌雄异株的杂交种已有数年。Fucus中的杂交是不寻常的，因为它似乎总是包括两性和雌雄异株的亲本对。我们利用10个微卫星座位和cpDNA确定了286个个体的渗入程度和空间模式。杂交种占种群的近13%，但亲本种分化较好(F(ST)=0.633)。在F(1)杂交种中，100%的F_1代出现叶绿体，表现为不对称杂交。在50%的导入株和5.4%的纯锯齿藻中检测到cpDNA，而在鹅绒委陵菜中未发现cpDNA。相比之下，核DNA的导入是对称的，每个亲本物种中都有等量(约1.5%)的基因导入。存活率和生存能力数据表明，在杂交区对杂交种进行了选择。
The introduced Fucus evanescens (hermaphroditic) and the native F. serratus (dioecious) have been in secondary contact along the Danish coast of the Kattegat Sea for 60-100 years and dioecious hybrids have been observed at Blushoj for several years. Hybridization in Fucus is unusual because it appears to always involve a hermaphroditic and a dioecious parental pair. We determined the degree and spatial patterns of introgression for 286 individuals using 10 microsatellite loci and cpDNA. Hybrids accounted for nearly 13% of the population, yet parental species were well differentiated (F(ST) = 0.633). The presence of F. evanescens chloroplasts in 100% of F(1) hybrids revealed asymmetrical hybridization. Fucus evanescens cpDNA was observed in 50% of introgressed and 5.4% of pure F. serratus, but no F. serratus cpDNA was found in F. evanescens. In contrast, nuclear DNA introgression was symmetrical with an equal amount (approximate to 1.5%) of genes introgressed into each parental species. Survivorship and viability data suggest selection against hybrids in the hybrid zone.