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Role of inbreeding depression and purging in captive
breeding and…
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Stocks
- Originated from a common source (Spencer et al., 2000)
- Virgin offspring were utilized to establish all experimental populations.
- Founders for experimental populations, as well as populations experiencing past bottlenecks, were generally selected at random from available adults (individuals with large deformities is not used)
- Six population established with the offspring of fish maintained in a large outbred stock that had no bottleneck experience while six population had bottleneck experience of a single pair of individuals.
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Populations that experienced multiple bottlenecks appear to become fixed through time for alleles that may not be lethal but still affect individual reproduction or survival.
Once fixation occurs during a bottleneck, further inbreeding
cannot remove these alleles through selection.
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Day et al. (2003)
found that inbreeding depression resulting from brief, serial bottlenecks was
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The difference between the growth of populations founded by siblings and non siblings should decrease with the number of past bottlenecks as predicted by the purging hypothesis.
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Purged population may have difficulty adapting to new conditions if loss of variation due to inbreeding depression is caused by highly deleterious alleles.
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Conservation biologists more concerned on the implications of purging population viability than how inbreeding depresses individual fitness.
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- To replicate aquatic environments with natural prey and predator; not covered and no supplement feeding is necessary (Leberg 1990b, 1993; Spencer et al. 2000)
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Population may go extinct during purging process (Hedrick1994; Fu et al 1998;Wang et al 1999, Wang 2000)
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Reducing rate of inbreeding might improve the efficiency of purging but not enough to prevent comprising population viability (Reed et al 2003).
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Even if a population survives purging, its future viability may be compromised. Deleterious but nonlethal alleles can become fixed in inbred populations (Hendrick 1994;Fu et al.1998)
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- It is expected text that there will be significant interaction between bottleneck history and founder relatedness if the purging have effect on the inbreeding depression.
Founders
- Some founders failed to successfully establish populations hence it is unsure that the cause of failure related to the experimental treatments.
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more similar to that resulting from continuous rapid inbreeding than the more effective continuous, slow inbreeding
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GROUP 2
- Introduction - Azizi - Pheasant 2
- The genetic basis of inbreeding depression - Abid Faiq - Elephant 2
- Environment and purging + Conclusion - Hana' - Tigers/Lions 1
- Response to different level of inbreeding - Dyg Nur 'Izyan - Rhinoceros 1
- Purging and brief bottlenecks - Nurin - Giant Panda 2
- Purging and population viability - Christilia - Hornbill 2
- Purging& the recovery of fish population - Fayedonna - Tortoise/Snake 2
- Methods - Brianna - Tortoise/Snake 1
- Results and discussion Fatmie - Rhinoceros 2