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Posted by Rick Staub on January 07, 1999 at 20:50:13:
In Reply to: Re: linebreeding and inbreeding: with all due respect posted by Rainshadow on January 07, 1999 at 03:03:13:
I know I used it earlier as an example but I don't think you can use albinos as an example. The reason I say this is that with albinos you are selecting (through inbreeding) for that one trait (amelanism) but you do not know how many other genes are also potentially mutated and deleterious that lie in close proximity to the melanin gene and would therefore be almost genetically linked with albinism. So if you have an albino strain that is having difficulty, can you really say that it is inbreeding or is it the fact that you are heavily selecting for one trait and everything else that may be linked. Still it is amazing how many heavily inbred albino lines are out there that seem to be thriving. Of course this is in a cage and not in the wild. This is of course why the stud books came into being so that should any threatened species become extinct in the wild, then we have saved as much genetic diversity as possible in captivity should reintroductions into the wild become a reality or if the species needs to be maintained in captivity indefinitely. Rick Staub
: This recent data suggests that there may be genetic mechanisms in place in wild populations that inhibit the effects of inbreeding depression. Steve Osborne
: I disagree,however,the mysterious "genetic mechanism" is called natural selection,and,the opposite can,and,is being practiced as a result of commercial breeding.amelanism,for example, in wild poulations,is the exeption rather than the rule.I think to convince ourselves that simply because reptiles have proven themselves to be more resilient to the deleterious effects of intense inbreeding,in comparison to more highly evolved forms of life,and,are therefore immune to the same pitfalls,is shortsighted,at best. I honestly beleive,I have seen negative effects of this, manifest,not only in Dumeril's Boas,but,also in Burmese Pythons(particularly albinos),Western Diamondbacks(also amel's),as well as,Cal.Kings,and,Corn morphs,these examples were most certainly not all husbandry errors. This is one of the reasons that studbook programs have begun to be implemented with species of limited genetic bases. R...
