Genetic diversity in the fiddler crab Austruca occidentalis from sites at natural mangroves and salt ponds in Tanzania, Western Indian Ocean based on microsatellites.

N: sample size; Na: number of different alleles; Ae: mean effective number of alleles; I: Shannon's information index; Ho: observed heterozygosity; uHe: unbiased expected heterozygosity; PA: number of private alleles; Fis: inbreeding coefficient, Ar: Allelic richness;.N and.S are the codes for natural mangrove and salt pond sites respectively.