Population Subdivision

What effect does population subdivision have on a population

decrease in heterozygosity, increase in homozygosity, inbreeding like effect

The Wahlund Effect

Powerpoint example

a sub-structured population has 3 levels of complexity

individual organisms (I)

subpopulations (S)

total population (T)

Hi

heterozygosity of an individual in a population (average actual observed heterozygosity of all genes/loci in an individual, or the probability of heterozygosity of any one gene/locus)

Hs

expected heterozygosity of an individual in an equivalent random mating subpopulation (level of heterozygosity found in a subpopulation w/ random mating)

Ht

expected heterozygosity of an individual in an equivalent random mating total population (all subpopulations pooled together)

REVIEW MATH PORTION

REVIEW MATH PORTION

hierarchical F statistics

all types of "inbreeding coefficients”, but they differ in their reference populations

Using observed or estimated parameters in the foregoing F equations

not necessarily the best

- need additional methods to correct for effects of sampling a

limited no. of

- need additional methods to correct for effects of sampling a

limited no. of

(i) subpopulations

(ii) individuals per subpopulation

- complex (eg Weir and Cockerham 1984)