Steve Cramer Casey Justice Ian Courter Environmental drivers of steelhead abundance in partially anadromous Oncorhynchus mykiss populations.

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Presentation transcript:

Steve Cramer Casey Justice Ian Courter Environmental drivers of steelhead abundance in partially anadromous Oncorhynchus mykiss populations

Key Characters in the Plot

Project Objectives Determine how environmental factors drive productivity of resident and anadromous O. mykiss ecotypes Test this understanding: Can the functional relationships of O. mykiss productivity to environmental factors predict the observed distribution of the two ecotypes in the Yakima Basin?

Examples of Resident Rainbow Streams within the Anadromous Fish Zones August BasinFlow (cfs)Temperature McKenzie2,60054 o F Metolius1,40046 o F Upper Yakima3,60060 o F Upper Sacramento 10,00055 o F

Mainstem Teanaway

Teanaway and Yakima River confluence

Yakima River Temperatures

Rainbow And Steelhead Intermix And Produce Both Types Interbreeding of Rb x St is observed Genetics show similarity by basin, not by ecotype Breeding studies show each type produces some of the other Sr/Ca ratio in otoliths of spawners confirms cross parentage

Focal Point Depth and Velocity. From Everest and Chapman 1972

Depth Suitability for O. mykiss

Velocity Suitability for O. mykiss

From Grant and Kramer (1990)

From Rand et al. (1993) and Mangel and Sattherthwaite (2008). Modeling Growth in Freshwater Growth = anabolic gains – catabolic losses Factors influencing growth: 1)Temperature 2)Food availability

Mainstem Growth

Growth of PIT-tagged Wild Steelhead Recaptured 1 yr after Tagging Keifer et al Salmon & Clearwater River tributaries

Relationship Between Temperature & Trout Biomass Salt River Basin (Isaak and Hubert 2004) Log 10 (Biomass) Mean Stream Temperature ( o C)

MWAT ( o C) Mean coho density (no./m 2 ) Juvenile Coho Density vs. Temperature 260 Oregon Coast Sample Sites Extended Bar shows 2 Standard Errors

Conclusions Channel size, flow and temperature are key factors that determine carrying capacity for resident fish over 250 mm, and may determine which of the two ecotypes will dominate Data are available in the Yakima Basin to predict how carrying capacity for O. mykiss will be affected by flow, temperature, and channel morphology We can test how well we understand the factors driving life history of O. mykiss by: –Using what we understand to build a life cycle model for O. mykiss –Plug in actual values for habitat and environmental factors, –Compare how the predicted and observed distributions of the two ecotypes match

Growth is a Key Driver Growth determines size at age Size determines the area of habitat occupied Size at age determines winter survival in freshwater Size at smolting determines ocean survival

Hypothesis Variation in flow conditions influence the distribution of the two ecotypes across subbasins

Substantial declines in summer discharge will reduce carrying capacity for adult resident fish and promote a migratory life-history strategy Hypothesis

Over-winter Survival

Data from Ward and Slaney (1989) Marine Survival

Rearing capacity = Habitat Area (m2) / Territory size (m2)

Atlas of Pacific Salmon (2005)

Tributary Growth