PDF(Pubmed)
Abstract：
Understanding inbreeding depressions (IBDs), the effect on the phenotypic performance of inbreeding, is of major importance for evolution and conservation genetics. Inbreeding depressions in aquatic animals were well documented in a domestic or captive population, while there is less evidence of inbreeding depression in natural populations. Chinese shrimp, Fenneropenaeus chinensis, is an important species in both aquaculture and fishery activities in China. To investigate inbreeding depression in natural populations, four Fenneropenaeus chinensis natural populations (Huanghua, Qinhuangdao, Qingdao, and Haiyang) were collected from the Bohai and Yellow seas. Microsatellite markers were used to evaluate individual inbreeding coefficients (F) of all samples. Furthermore, the effects of inbreeding on growth traits were investigated. The results showed marker-based F was continuous and ranged from 0 to 0.585, with an average of 0.191 ± 0.127, and there was no significant difference among the average F of the four populations. Regression analysis using the four populations showed inbreeding had a very significant (p < 0.01) effect on body weight. When analyzing a single population, regression coefficients were also all negative and those in Huanghua and in Qingdao were significant at the level of p < 0.05 and < 0.01, respectively. Inbreeding depressions, expressed as the percent change in body weight per 10% increase in F, were 2.75% in Huanghua, 2.22% in Qingdao, and 3.69% in all samples. This study provided a piece of rare evidence of inbreeding depression in natural populations and also guidance toward the conservation of wild Fenneropenaeus chinensis resources.
摘要：
了解近交洼地(IBD)，对近交表型表现的影响，对进化和保护遗传学至关重要。水生动物的近亲繁殖洼地在家养或圈养种群中有很好的记录，而自然种群中近亲繁殖抑郁症的证据较少。中国虾,中国对虾，是中国水产养殖和渔业活动中的重要物种。为了调查自然种群的近亲繁殖抑郁症，四个中国明对虾自然种群(黄花，秦皇岛,青岛,和海阳）是从渤海和黄海收集的。微卫星标记用于评估所有样品的个体近交系数(F)。此外，研究了近交对生长性状的影响。结果表明，基于标记的F是连续的，范围从0到0.585，平均为0.191±0.127，四个种群的平均F之间没有显着差异。使用四个种群的回归分析显示近亲繁殖对体重具有非常显着的影响（p<0.01）。当分析单个种群时，回归系数也均为负，黄桦和青岛的回归系数分别在p<0.05和<0.01的水平上显著。近亲繁殖的洼地,表示为每增加10%的F，黄过滤器为2.75%，青岛2.22%，和3.69%的所有样品。这项研究提供了自然种群近亲繁殖抑郁症的罕见证据，也为野生中国对虾资源的保护提供了指导。
