Despite overwhelming evidence from laboratory

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Despite overwhelming evidence from laboratory
domesticated species, there has been considerable
skepticism that inbreeding depression occurs in
wildlife. Ralls Ballou found higher mortality
in inbred versus outbred progeny for 41 of 44
species of mammals. On average, progeny of
full-sib matings displayed a 33 reduction in
juvenile survival.
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Characteristics of Inbreeding Depression Animals
Plants Offspring Pollen Quality Juvenile
Survival Number of Ovules Longevity Amount of
Seed Interbirth interval Germination Rate Mating
Ability Growth Rate Maternal Ability Competiti
ve Abilities Sperm Quantity Quality Competitive
Ability Developmental Time
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Remedy for inbreeding depression is to
outcross the inbred population to another
unrelated population. In many cases of
conservation concern, no other outbred population
exists. If other, independent, inbred
populations exist, they will usually allow
recovery of fitness.
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