October 17-Late - Species begin to decline and go extinct:...

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Species begin to decline and go extinct: whole distribution is shrinking, range fragmentation (groups of populations disconnected from other groups). Not good because inbreeding may occur, over a long period of time everybody becomes related to someone else to some degree. Put animals in reserve, good way to preserve them—in theory. Realistically animals still go extinct because of the area. Smaller reserves = higher extinction. Smaller area = smaller population. But there are still animal extinctions in large reserves. Good years, bad years, not enough of species to populate it. The trick is to connect fragment areas (disconnected populations) make corridors, connect populations. In doing so, there is a larger probability of population surviving, but difficult to do. No good solution in maintaining rare species. Small populations are susceptible to inbreeding. Inbreeding will reduce homozygosity, ends up producing inbreeding depression, there will be fewer offspring and susceptibility to disease. Ethiopian wolves: related to dogs, coyotes, wolves’ etc. Dogs were released in Africa and
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This note was uploaded on 01/30/2012 for the course BIO 311D taught by Professor Reichler during the Fall '08 term at University of Texas.

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