ZOOLOGY 651 Lecture Notes - Lecture 21: California Condor, Chestnut Blight, Whooping Crane

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Captive breeding and reproduction in situ efforts exhausted: Pva indicates very high risk of extinction in the wild despite management efforts. When stock for augmentations and reintroduction can"t be o known genetic/demographic problems that can be dealt with in capacity but not in the wild remnant population may not be healthy enough. Goals: establish captive, self-sustaining population capable of becoming a source population for augmentation/reintroduction retain 90% of initial heterozygosity for 200 years (or until reintroduction) also avoid demographic stochasticity captive populations pass through three phases: founder phase. Picking the founders establish good demographic base sex ratio, age structure, etc. fully sample genetic diversity of source populations. 20-30 good individuals likely to have high heterozygosity. Genetic surveys of source populations are better. Problem: captive breeding often begins too late too few founders, genetic diversity already lost ideally, establish captive population as part of comprehensive strategy for species growth phase. Maximizing r in founder and fx generations.

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