The Umatilla Basin Natural Production Monitoring and Evaluation Project, 2008 Annual Progress Report.

Contor, Craig R.; Harris, Russell; King, Marty

doi:10.2172/962476

Cited by 2 publications

(7 citation statements)

References 12 publications

(19 reference statements)

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“…Estimated annual recruitment of natural steelhead adults in each population was assigned to brood years based on population-specific age at return data indicated by scale samples from unmarked adults, presumed to be of natural origin. Adult age composition data were only available for the Umatilla (Contor 2003 Total adult age at spawning ranged from 3 to 7 years, but most individuals in a population (84.5-95.6%) matured at age 4 or 5. Small numbers of repeat spawners were present in the Deschutes (1.1%) and Yakima (1.6%) samples.…”

Section: Methodsmentioning

confidence: 99%

“…Adult recruit estimates for each brood year and population were therefore developed by applying a constant age composition. Possible effects of assuming constant age composition on accuracy and bias of brood year recruit estimates were examined with nine brood years of age composition data from Umatilla steelhead (Contor 2003). Brood year recruitment estimated with constant age composition was highly correlated with estimates derived from actual age data (R 2 = 0.79, df = 8, P = 0.001), but the constant age composition method resulted in a 23% lower CV (100·SD/mean) in recruitment estimates for individual brood years.…”

Section: Methodsmentioning

confidence: 99%

“…To adjust annual weir counts of hatchery strays to include an unmarked fraction, I assumed that the annual unmarked proportion would equal the proportion of unmarked fish in hatchery smolt releases, within and upstream from the study area, 2 years before a given spawning run. This 2-year lag reflects the predominant period from smolt release to adult return in hatchery steelhead released from interior Columbia and Snake River facilities (Carmichael et al 1994;Contor and Schwartz 2007), the primary source of hatchery strays encountered at Warm Springs weir (Hand and Olson 2004). Corrected annual estimates of hatchery strays reaching Warm Springs River were estimated as…”

Section: Methodsmentioning

confidence: 99%

“…The Umatilla and Yakima basins have both been developed for irrigated agriculture, involving headwater storage reservoirs and main-stem diversion dams. Adult steelhead returns to the Umatilla River are enumerated at Three Mile Dam (rkm 4) (Contor and Costi 2011). The adult steelhead run consists of unmarked natural fish, marked hatchery fish from native Umatilla stock, and marked out-of-basin stray hatchery steelhead estimated to comprise 5.8% of the annual steelhead counts.…”

Section: Umatilla and Yakimamentioning

confidence: 99%

“…Hatchery smolts, reared at a facility outside the Umatilla River basin, were released from up to four acclimation ponds on the river main stem and one tributary. Steelhead spawn in 25 tributaries and the upper Umatilla River main stem (Contor 2003).…”

Section: Umatilla and Yakimamentioning

confidence: 99%

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Natural Productivity in Steelhead Populations of Natural and Hatchery Origin: Assessing Hatchery Spawner Influence

Lister¹

2013

Trans Am Fish Soc

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Natural productivity, the number of natural-origin adult recruits per parent, is an important parameter for assessing population status of steelhead Oncorhynchus mykiss (anadromous Rainbow Trout) and Pacific salmon Oncorhynchus spp. listed under the U.S. Endangered Species Act. Hatchery-origin adults comprise a majority of many salmon and steelhead spawning populations. In such cases, the utility of natural productivity estimates is affected by uncertain reproductive fitness of hatchery spawners and by possible ecological or genetic interactions among hatchery and natural fish. This study examined options for analyzing population census data to assess hatchery spawner effects on natural productivity of mixed steelhead populations including spawners of hatchery and natural origin. It compared productivity in three mixed and reference (natural) population pairs, and estimated productivity as natural recruits per total spawners of natural and hatchery origin (R nat /S tot ) or as natural recruits per natural spawner (R nat /S nat ). Natural productivity estimated as R nat /S tot reflected hatchery program scale, not productive capacity of natal streams. This analytical approach masked natural production dynamics in populations with a major hatchery spawner proportion, and was therefore of limited use for determining hatchery spawner influence. Productivity estimated as R nat /S nat indicated similar productivity of reference and mixed populations, and an absence of hatchery spawner effect, in the case of (1) a large hatchery stray component, and (2) a hatchery supplementation program. In the third pairing, R nat /S nat productivity of the mixed population significantly exceeded that of the reference population, suggesting natural spawner abundance is below carrying capacity. Hatchery spawners contributed to natural productivity in that case, but in the presence of reduced natural spawner density. These findings suggest that hatchery spawners are unlikely to affect natural production of a mixed steelhead population unless natural spawner abundance is below carrying capacity.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Umatilla and Yakimamentioning

confidence: 99%

Section: Umatilla and Yakimamentioning

confidence: 99%

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Natural Productivity in Steelhead Populations of Natural and Hatchery Origin: Assessing Hatchery Spawner Influence

Lister¹

2013

Trans Am Fish Soc

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The irrigation efficiency trap: rational farm-scale decisions can lead to poor hydrologic outcomes at the basin scale

Morrisett,

Van Kirk,

Bernier

et al. 2023

Front. Environ. Sci.

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Agricultural irrigation practices have changed through time as technology has enabled more efficient conveyance and application. In some agricultural regions, irrigation can contribute to incidental aquifer recharge important for groundwater return flows to streams. The Henrys Fork Snake River, Idaho (United States) overlies a portion of the Eastern Snake Plain Aquifer, where irrigated agriculture has occurred for over a century. Using irrigator interviews, aerial and satellite imagery, and statistical streamflow analysis, we document the impact of farm-scale decisions on basin-scale hydrology. Motivated to improve economic efficiency, irrigators began converting from surface to center-pivot sprinkler irrigation in the 1950s, with rapid adoption of center-pivot sprinklers through 2000. Between 1978–2000 and 2001–2022, annual surface-water diversion decreased by 311 Mm3 (23%) and annual return flow to the river decreased by 299 Mm3 over the same period. Some reaches that gained water during 1978–2000 lost water to the aquifer during the later period. We use an interdisciplinary approach to demonstrate how individual farm-scale improvements in irrigation efficiency can cumulatively affect hydrology at the landscape scale and alter groundwater-surface water relationships. Return flows are an important part of basin hydrology in irrigated landscapes and we discuss how managed and incidental aquifer recharge can be implemented to recover return flows to rivers.

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The Umatilla Basin Natural Production Monitoring and Evaluation Project, 2008 Annual Progress Report.

Cited by 2 publications

References 12 publications

Natural Productivity in Steelhead Populations of Natural and Hatchery Origin: Assessing Hatchery Spawner Influence

Natural Productivity in Steelhead Populations of Natural and Hatchery Origin: Assessing Hatchery Spawner Influence

The irrigation efficiency trap: rational farm-scale decisions can lead to poor hydrologic outcomes at the basin scale

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