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5 - Population Persistance

M532 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: rizzly bear populations immigration of 2 unrelated bears every 10 years substantially reduces loss of variability 100 95 90 85 N=100, isolated Exchange 80 75 0 20 40 60 80 100 120 Years M5.33 Bio 3115 Université d’Ottawa / University of Ottawa Qualitative Guidelines for Genetically Based Conservation Practices Maintain local population sizes at levels where inbreeding and founder effects on genetic variability are likely to be small. Management of wild populations should be consistent with the history of their genetic patterns and processes. E.g. gene flow among historically connected populations should continue at historical rates, even if that calls for assisted movement of individuals! Low genetic diversity per se is not necessarily cause for alarm, but sudden and large losses of diversity are. Avoid artificial selection in captivity. Breeding populations should be kept in captivity for as few generations as possible, and also by simulating wild conditions as closely as possible. M5.34 Bio 3115 Université d’Ottawa / University of Ottawa M5 2009-2010.17 BIO 3115 Conservation Biology Qualitative Guidelines for Genetically Based Conservation Practices - cont. After a population crash, encourage rapid population growth to avoid a prolonged bottleneck. Avoid possible outbreeding depression caused by breeding distantly related populations if other choices are available. Avoid inadvertent introductions of exotic alleles into wild or captive populations. Harvesting of wild stock (hunting, fishing) can select for genetic changes that can affect the future evolution of the population or sp. (e.g. selection of the largest individuals can select for earlier maturity at smaller body sizes). Thus, avoid selection in harvesting wild stocks. Maintenance of genetic diversity in captive stocks is no substitute for genetic diversity in the wild. M5.35 Bio 3115 Université d’Ottawa / University of Ottawa M5 2009-2010.18...
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