|Document Type:||Journal Article|
|Title:||Increased natural reproduction and genetic diversity one generation after cessation of a steelhead trout (Oncorhynchus mykiss) conservation hatchery program|
|Author:||B. A. Berejikian, Donald M. Van Doornik|
Spatial and temporal fluctuations in productivity and abundance confound assessments of captive propagation programs aimed at recovery of Threatened and Endangered populations. We conducted a 17 year before-after-control-impact experiment to determine the effects of a captive rearing program for anadromous steelhead trout (Oncorhynchus mykiss) on a key indicator of natural spawner abundance (naturally produced nests or ¿redds¿). The supplemented population exhibited a significant (2.6-fold) increase in redd abundance in the generation following supplementation compared to four control (non-supplemented) populations. Expected heterozygosity increased significantly, and allelic richness increased, but to a lesser (non-significant) degree. Effective population size estimates increased from 24.4 before supplementation to 38.9 after supplementation. Several non-conventional aspects of the captive rearing program may have contributed to the positive response in the natural population.
Before-after-control impact evaluation of a conservation hatchery program for steelhead trout.
|Theme:||Recovery and rebuilding of marine and coastal species|
Evaluate the effects of artificial propagation on recovery, rebuilding and sustainability of marine and anadromous species.
Berejikian BA, Van Doornik DM (2018) Increased natural reproduction and genetic diversity one generation after cessation of a steelhead trout (Oncorhynchus mykiss) conservation hatchery program. PLoS ONE 13(1): e0190799. https://doi.org/10.1371/journal. pone.0190799