TAILIEUCHUNG - Báo cáo sinh học: "Familial versus mass selection in small populations"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Familial versus mass selection in small populations | 425 Genet. Sel. Evol. 35 2003 425-444 INRA EDP Sciences 2003 DOI gse 2003032 Original article Familial versus mass selection in small populations Konstantinos Theodorou Denis Couvet Muséum national d histoire naturelle Centre de recherches sur la biologie des populations d oiseaux 55 rue Buffon 75005 Paris France Received 25 March 2002 accepted 18 December 2002 Abstract - We used diffusion approximations and a Markov-chain approach to investigate the consequences of familial selection on the viability of small populations both in the short and in the long term. The outcome of familial selection was compared to the case of a random mating population under mass selection. In small populations the higher effective size associated with familial selection resulted in higher fitness for slightly deleterious and or highly recessive alleles. Conversely because familial selection leads to a lower rate of directional selection a lower fitness was observed for more detrimental genes that are not highly recessive and with high population sizes. However in the long term genetic load was almost identical for both mass and familial selection for populations of up to 200 individuals. In terms of mean time to extinction familial selection did not have any negative effect at least for small populations N 50 . Overall familial selection could be proposed for use in management programs of small populations since it increases genetic variability and short-term viability without impairing the overall persistence times. familial selection deleterious mutation genetic load extinction genetic variation 1. INTRODUCTION Haldane 17 defined familial selection as the selective regime under which each family in a population contributes the same number of adults in the next generation. Selection acts among offspring within families and not among the entire set of offspring produced in the population as in the case of mass or ordinary selection. Such a selection may occur in mammals when .

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