ISOLATION BY DISTANCE

Isolation by distance in Bougainville.

The technique of population structure analysis based upon the model of Malécot is applied to blood polymorph, anthropometric, and demographic data collected from residents of south-central Bougainville Island, Territory of New Guinea. The results from these several analyses are relatively consistent and support the idea that this theoretical model can be applied successfully to real sets of bio...

IBD (Isolation by Distance): a program for analyses of isolation by distance.

The genetic similarity among individuals or populations can be ascertained using a number of statistical techniques (reviewed by Bohonak 1999; Neigel 1997; Roderick 1996; Slatkin 1985). When populations can be defined a priori, one option is to analyze genetic ‘‘isolation by distance’’ (sensu Wright 1943) by plotting the genetic similarity (or distance) among population pairs as a function of t...

The trouble with isolation by distance.

The genetic population structure of many species is characterised by a pattern of isolation by distance (IBD): due to limited dispersal, individuals that are geographically close tend to be genetically more similar than individuals that are far apart. Despite the ubiquity of IBD in nature, many commonly used statistical tests are based on a null model that is completely non-spatial, the Island ...

Sewall Wright and Gustave Malécot on Isolation by Distance

Spatial distributions of genotypes under isolation by distance.

The spatial distributions of single-locus diploid genotypes, produced within populations of sexually reproducing individuals under isolation by distance, are measured and characterized in detail by quantifying the join-counts for simulated model populations. The models more realistically reflect spatially explicit distributions of genotypes in populations, because unlike the classical theory, t...