Can interbreeding of wild and artificially propagated animals be prevented by using broodstock selected for a divergent life history

摘要: Two strategies have been proposed to avoid negative genetic effects of artificially propagated individuals on wild populations: (i) integration and captive populations minimize domestication selection (ii) segregation released from the population interbreeding. We tested efficacy strategy by divergent life history in a steelhead trout, Oncorhynchus mykiss, system, where hatchery fish were selected spawn months earlier than indigenous population. The proportion ancestry smolts adults declined 10–20% over three generations since program began. Up 80% naturally produced any given year hatchery/wild hybrids. Regression model analysis showed that was lower years when stream discharge high, suggesting effect flow reproductive success early-spawning fish. Furthermore, proportions hybrid higher number spawning hatchery-produced higher. Divergent failed prevent interbreeding physical isolation ineffective, an inadequacy is likely prevail many other situations.