Figure 1.

Schematic illustrating the initiation (the founding P ₁ generation) and subsequent propagation (F ₁–F ₄ generations) of the integrated and segregated hatchery lines of anadromous Chinook salmon at the Cle Elum Supplementation and Research Facility (modified from Waters et al., 2015). Each box denotes the number of spawners (wild environment) and the number of broodstock (hatchery environment) for each year surveyed. Linear arrows indicate the contribution of wild spawners or hatchery broodstock to the subsequent generation. Circular arrows represent unobserved mating between wild‐born (unmarked) and hatchery‐born (marked) spawners in the wild environment. Fish from the two lines are differentially marked, so only hatchery‐born fish from the integrated line are permitted to spawn in the wild. Dark gray boxes represent wild adults, light gray boxes represent natural‐origin adults with hatchery, wild, or hybrid ancestry, and white boxes represent adults born in the hatchery