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Data from: Little impact of hatchery supplementation that uses native broodstock on the genetic structure and diversity of steelhead trout revealed by a large scale spatio-temporal microsatellite survey

Citation

Gow, Jennifer L et al. (2011), Data from: Little impact of hatchery supplementation that uses native broodstock on the genetic structure and diversity of steelhead trout revealed by a large scale spatio-temporal microsatellite survey, Dryad, Dataset, https://doi.org/10.5061/dryad.bq583

Abstract

Artificial breeding programs initiated to enhance the size of animal populations are often motivated by the desire to increase harvest opportunities. The introduction of non-native genotypes, however, can have negative evolutionary impacts. These may be direct, such as introgressive hybridization, or indirect via competition. Less is known about the effects of stocking with native genotypes. We assayed variation at nine microsatellite loci in 902 steelhead trout (Oncorhynchus mykiss) from five rivers in British Columbia, Canada. These samples were collected over fifty eight years, a time period that spanned the initiation of native steelhead trout broodstock hatchery supplementation in these rivers. We detected no hanges in estimates of effective population size, genetic variation or temporal genetic structure within any population, nor of altered genetic structure among them. Genetic interactions with non-migratory O. mykiss, the use of substantial numbers of primarily native broodstock with an approximate 1:1 male to female ratio, and/or poor survival and reproductive success of hatchery fish may have minimized potential genetic changes. Although no genetic changes were detected, ecological effects of hatchery programs still may influence wild population productivity and abundance. Their effects await the design and implementation of a more comprehensive evaluation program.

Usage Notes

Location

southwestern British Columbia