The impact of supplementation in winter-chinook salmon on effective population size

Article Abstract:

Supplementation has potential benefits, but several recognized possible problems such as negative ecological effects or detrimental genetic impacts. The annual number of spawners of the winter-run chinook salmon from the Sacramento River, California, have fallen and a supplementation program has been underway at Coleman National Fish Hatchery on Battle Creek, a tributary of the Sacramento River. The overall impact of supplementation was evaluated by estimating the effective population size. Mistaken use of non-winter-run chinook spawners led to artificial crosses between runs and potential reductions in population size.

Chinook salmon, Rare fishes

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Isolation and inheritance of novel microsatellites in chinook salmon (Oncorhynchus tschawytscha)

Article Abstract:

Microsatellites can play a valuable role in characterizing and managing winter-run chinook salmon (Oncorhynchus tschawytscha) in an artificial propagation and captive breeding programme. It has been possible to isolate and characterize 10 new microsatellite loci in winter-run chinook salmon by using the polymerase chain reaction. There are some limitations in characterizing microsatellite variation, and segregation distortion may also occur. However, salmon microsatellites are very likely to resolve parentage and to discriminate between closely related populations.

Animal genetics, Salmon

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Elephant seals and the estimation of a population bottleneck

Article Abstract:

Simple population genetic formulation techniques can be used to generate an expected value that characterizes elephant seal population bottlenecks. Such formulations must include the appropriate genetic data and will account for genetic diversity losses and bottleneck magnitude and duration parameters. The approach yielded results for finite effective population size based on loss of genetic variance.

Animal populations, Population genetics, Elephant seals

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