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Estimating allelic richness and its diversity
- Source :
- Livestock Science, Livestock Science, Elsevier, 2006, 101, pp.150-158
- Publication Year :
- 2006
- Publisher :
- HAL CCSD, 2006.
-
Abstract
- Assessing allelic richness in a set of populations requires that variations of sample size be taken into account. One way of doing this is to estimate the number of alleles expected in samples of specified size, using the rarefaction method applied in ecology. An alternative method, based on extrapolation, consists of adding to the number of alleles actually seen in a population the expected number of alleles missing, given the number of genes examined in the population and the allelic frequencies observed over the whole set of populations. Heterogeneity of allelic richness across populations and across loci can also be tested in this framework by numerical re-sampling. Both methods provide a measure of “private” allelic richness, a useful criterion in genetic diversity preservation, by allowing evaluation of the uniqueness of each population in terms of allele numbers. The two methods are compared on isozyme loci in the argan tree of Morocco and on microsatellite genotypes in the European pig. In both species, allelic richness and gene diversity behave quasi-independently over the populations compared and a higher differentiation is observed in allelic richness compared to gene diversity. In general, the rarefaction technique is sensitive to the sample size of reference and may lack sensitivity to rare alleles when the sample size of reference is small. Extrapolation may thus be recommended especially when the sample sizes of the populations are either low on average or highly unbalanced among populations.
- Subjects :
- [SDV]Life Sciences [q-bio]
Population
CONSERVATION
ALLELIC RICHNESS
Biology
03 medical and health sciences
Genotype
Allele
education
ComputingMilieux_MISCELLANEOUS
030304 developmental biology
Genetics
0303 health sciences
Genetic diversity
education.field_of_study
General Veterinary
0402 animal and dairy science
04 agricultural and veterinary sciences
040201 dairy & animal science
[SDV] Life Sciences [q-bio]
Evolutionary biology
Sample size determination
Microsatellite
Rarefaction (ecology)
GENETIC DIVERSITY
Animal Science and Zoology
Species richness
Subjects
Details
- Language :
- English
- ISSN :
- 18711413
- Database :
- OpenAIRE
- Journal :
- Livestock Science, Livestock Science, Elsevier, 2006, 101, pp.150-158
- Accession number :
- edsair.doi.dedup.....d579b99fbe492daef917c27fd83baada