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• W2350532359 abstract "The Yangtze finless porpoise( Neophocaena asiaeorientalis asiaeorientalis) is a unique freshwater subspecies of N. asiaeorientalis,which is endemic to the Yangtze River of China and is now critically endangered. Due its natural habitat is not expected to improve in near future,ex situ conservation was considered as the most important strategy to prevent it from extinction. However,in theory,without effective human intervention,inbreeding is unavoidable for any ex situ small population. To evaluate the inbreeding level of the ex situ Yangtze finless porpoise population living in Tian'ezhou National Natural Reserve,and to provide useful reference information for its population genetic management,21 polymorphic microsatellite loci wereutilized in this study to conduct parentage identification and to analyze relatedness among individuals in this population. Maximum Likelihood method provided by Cervus V3. 0 and TrioML method were used to analyze parentage and pair-wise relatedness among individuals,respectively. As a result,three whole families with certain parents and offspring,together with 1 mother-offspring and 1 father-offspring pair were detected( Table4). Yet,it is impossible to evaluate the inbreeding level for this ex situ population based on such few parentages information. Nevertheless,relatedness analysis showed that the average relatedness index( r) of this population was 0. 118 2,and of the candidate parent pairs it was 0. 115 2. Both of them were significantly higher than those of the wild population living in the Poyang Lake( 0. 039 and 0. 038, respectively,unpublished data). Additionally,in this ex situ population,26. 14% of individual pairs have some relatedness( r 0.187 5,Table 5),which was 6 times higher than that in the wild population. Besides,inbreeding coefficient( Fis) of this population was 0.046. The results from both relatedness analysis and population inbreeding coefficient suggested that this ex situ population was in high risk of inbreeding or had already been suffering from inbreeding. To prevent this ex situ population from inbreeding or at least to mitigate the inbreeding level,on one hand,we recommend to remove the adult female F34 and male M45 from this population because they had so many possible relatives. On the other hand,we recommend to reintroduce two fertile porpoises( with an optimal sex ratio of 1∶ 1) every generation( about 5 years) from wild population or other ex situ populations. Besides,we proposed to construct an accurate genetic studbook for this ex situ population for facilitating future population genetic management." @default.
• W2350532359 created "2016-06-24" @default.
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• W2350532359 date "2014-01-01" @default.
• W2350532359 modified "2023-09-23" @default.
• W2350532359 title "Inbreeding Evaluation on the Ex Situ Conserved Yangtze Finless Porpoise Population in Tian'ezhou National Natural Reserve" @default.
• W2350532359 hasPublicationYear "2014" @default.
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