Impact of Asymmetrical Hybridization Followed By Sterile F1 Hybrids on Species Replacement in Pseudorasbora
Impact of Asymmetrical Hybridization Followed By Sterile F1 Hybrids on Species Replacement in Pseudorasbora
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不对称杂交后的不育 F1 杂交体对拟麦穗鱼物种替换的影响
DOI：
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发表时间：
2004
影响因子：
2.2
通讯作者：
K. Takata
中科院分区：
文献类型：
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作者：
Mayu Konishi;K. Takata
在日本东部濒临灭绝的淡水小鱼之一，麦穗鱼，已经在很大程度上被意外引入的物种，来自日本西部的小麦穗鱼所取代。在接触区，P.pumila和P.parva强烈杂交，产生不育的F1杂种。本研究利用线粒体DNA单倍型确定杂种F1的母本，以探讨杂种区小白蛾与白蛾的交配系统。我们还采用等位酶追踪了5年内杂交群体遗传结构的连续变化。从6个不同群体中采集的100个自然杂种F1无一例外地携带有白蛾mtDNA，表明不育F1仅由白蛾雌蛾和小白蛾雄蛾交配产生。这种不对称的杂交意味着，与P.parva雄性相比，P.pumila雌性浪费了相当大的生殖努力。这些数据表明，不对称杂交促进了P.parva对P.pumila的快速替代，导致不育的F1杂种。
Pseudorasbora pumila, one of the endangered freshwater minnows in eastern Japan, has been largely replaced by the accidentally introduced species, P. parva, which originated from western Japan. In the contact zone, P. pumila and P. parva have hybridized intensively, producing sterile F1 hybrids. The present study determined the maternal parent of F1 hybrids using mtDNA haplotypes to investigate the mating system between P. parva and P. pumila in the hybrid zone. We also pursued the successive changes in the genetic structures of hybridizing populations over a 5-year period using allozymes. A total of 100 natural F1 hybrids collected from six different populations had P. pumila mtDNA without exception, suggesting that sterile F1 hybrids resulted from mating only between P. pumila females and P. parva males. Such asymmetrical hybridization implies that P. pumila females waste considerably greater reproductive efforts compared with P. parva males. The data suggest that the rapid replacement of P. pumila by P. parva has been promoted by asymmetrical hybridization, resulting in sterile F1 hybrids.
影响因子：
1.9
作者：
LOUIS, EJ;DEMPSTER, ER
通讯作者：
DEMPSTER, ER