Using DNA markers to delineate populations of Yakima Basin steelhead

Introduction

Conclusions

Prosser Dam

Resident Trout

SH Population

Roza Dam SH

2) Determine if collections from Roza Dam constitute a

population mixture

Roza Dam Steelhead

Project Objectives

Results

• 2000 and 2001 Roza Dam collections were consistent with

HWE expectations, and the 2003, 2005 and 2006 had slight

deviation

• Linkage disequilibrium minimal

• FST = 0.001, not statistically different from zero


	1) We tested for HWE and LD in the five replicated collections from Roza Dam. The 2000 and 2001 Roza Dam collections were consistent with HWE expectations, and the 2003, 2005 and 2006 had slight deviations from equilibrium expectations. The LD results showed minimal correlations among alleles.
	2) These results suggest that Roza Dam collections are not composed of a mixture of populations upstream of the dam and are consistent with the presence of a single steelhead population above Roza Dam. Therefore, if steelhead are collected for broodstock at Roza Dam, these collections would represent one spawning population from the upper Yakima.