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Unformatted text preview: rizzly bear
populations immigration of 2 unrelated
bears every 10 years
substantially reduces loss
of variability 100
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
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
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
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.
Bio 3115 Université d’Ottawa / University of Ottawa M5 2009-2010.18...
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