By Edward O Price
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Fiumera et al. (2000) report on the loss of genetic diversity in captive-bred populations of a Lake Victoria cichlid (Prognathochromis perrieri) and the importance of captive subpopulations located at a number of institutions in maintaining genetic diversity in the population as a whole. The original captive population was founded by Fig. 1. Range of percentage frequencies of the homozygous PP gene arrangement on the third chromosome of individuals in ten populations of Drosophila pseudoobscura founded by 4000 individuals (left) and ten populations founded by 20 individuals (right) over 19 successive generations of laboratory breeding (Dobzhansky and Pavlovsky, 1957).
2001) describe the positive association between degree of inbreeding and the incidence of elbow and hip dysplasia in Labrador retrievers (C. familiaris), a growth disorder of the bone which causes arthritis. Hedrick and Kalinowski (2000) note that evidence of inbreeding depression in captive or laboratory environments may typically be less than, or at least be different from, the detrimental effects of inbreeding depression in more harsh natural environments. Husbandry and management conditions in captivity may buffer animals against the negative effects of inbreeding depression.
Shikano et al. 1% per 10% increase in the inbreeding coefficient. 32 Chapter 5 Among domestic animals, inbreeding depression has been demonstrated for such quantitative traits as juvenile mortality, egg hatchability, clutch size, milk yield, litter size and growth rate (Falconer and MacKay, 1996). Ralls et al. (1988) reported that full-sib mating increased juvenile mortality by an average of one-third in 40 captive wild animal populations representing 38 species. Laikre and Ryman (1991) describe inbreeding depression in a population of captive wolves in Scandinavian zoos.