| Assessment of parental contribution and effective population size from a 3×3 diallel cross of clam Meretrix meretrix |
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| 引用本文： | 代平,王鸿霞,刘保忠.Assessment of parental contribution and effective population size from a 3×3 diallel cross of clam Meretrix meretrix[J].中国海洋与湖沼学报,2014,32(2):306-315. |
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| 作者姓名： | 代平 王鸿霞 刘保忠 |
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| 基金项目： | Supported by the National High Technology Research and Development Program of China （863 Program） （No. 2012AA10A410） and the Key Technology R＆D Program of Jiangsu Province, China （No. BE2011372） |
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| 摘 要： | Unbalanced parental contribution and small effective population size(N e)are common issues during the artifi cial breeding of marine bivalves.The impact of hatchery-spawning practices on parental contribution,effective population size,the N e/N ratio,and genetic diversity are largely unknown.To address this,we conducted a parentage analysis on a complete 3×3 diallel cross of clam M eretrix meretrix using eight microsatellite markers.The genetic diversity of the parents was higher than that of their respective offspring in most crosses(8/9).Sires or dams from the same family contributed unequally to the pool of offspring from a particular cross,and the same parent clam exhibited large variation in parental contribution among different crosses.The variance in male contribution was higher than that of the female contribution in most crosses,suggesting that male contribution was more skewed than for females.The N e/N ratio for nine crosses ranged from 0.58 to 0.86.There was no linear relationship between the sex ratio and the N e/N ratio(P0.05).Moreover,a sex ratio closer to one-to-one does not necessarily mean a larger effective population size.A solution to small effective population size in commercial breeding programs is increasing broodstock numbers and attempting to maintain a balanced sex ratio.
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| 关 键 词： | 种群大小 双列杂交 父母 文蛤 遗传多样性 评估 性别比例 群体大小 |
Assessment of parental contribution and effective population size from a 3×3 diallel cross of clam Meretrix meretrix |
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| Ping Dai,Hongxia Wang,Baozhong Liu.Assessment of parental contribution and effective population size from a 3×3 diallel cross of clam Meretrix meretrix[J].Chinese Journal of Oceanology and Limnology,2014,32(2):306-315. |
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| Authors: | Ping Dai Hongxia Wang Baozhong Liu |
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| Institution: | 1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
2. University of Chinese Academy of Sciences, Beijing, 100049, China
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| Abstract: | Unbalanced parental contribution and small effective population size (N e) are common issues during the artificial breeding of marine bivalves. The impact of hatchery-spawning practices on parental contribution, effective population size, the N e/N ratio, and genetic diversity are largely unknown. To address this, we conducted a parentage analysis on a complete 3×3 diallel cross of clam M eretrix meretrix using eight microsatellite markers. The genetic diversity of the parents was higher than that of their respective offspring in most crosses (8/9). Sires or dams from the same family contributed unequally to the pool of offspring from a particular cross, and the same parent clam exhibited large variation in parental contribution among different crosses. The variance in male contribution was higher than that of the female contribution in most crosses, suggesting that male contribution was more skewed than for females. The N e/N ratio for nine crosses ranged from 0.58 to 0.86. There was no linear relationship between the sex ratio and the N e/N ratio (P > 0.05). Moreover, a sex ratio closer to one-to-one does not necessarily mean a larger effective population size. A solution to small effective population size in commercial breeding programs is increasing broodstock numbers and attempting to maintain a balanced sex ratio. |
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| Keywords: | effective population size （No） Meretrix meretrix microsatellite markers parental contribution sex ratio |
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