Umatilla Basin Natural Production Monitoring and Evaluation; 1994-1995 Annual Report.

Contor, Craig R.; Hoverson, Eric; Kissner, Paul

doi:10.2172/257393

Cited by 4 publications

(8 citation statements)

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“…Of the 20 study sites, nine were permanent and 11 were intermittent. Intermittent sites dry annually in early to mid‐July and remain dry until enough winter precipitation raises the water table (generally January to February; Contor, Hoverson, Kissner, & Volkman, ; Wooster personal observation).…”

Section: Methodsmentioning

confidence: 99%

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

Wooster

DeBano

2018

River Research & Apps

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Biotic richness in intermittent reaches (α-diversity) is generally lower than in perennial reaches. However, variability among intermittent reaches (β-diversity) is predicted to be higher. Yet how patterns in αand β-diversity scale up to influence stream network diversity is unclear and has received little attention. In addition, the timing of sampling relative to the resumption of flow in intermittent reaches should influence patterns in diversity. We predicted that early in the wet season, assemblages in intermittent reaches would be recovering from drying and have lower α-diversity and higher βdiversity relative to perennial reaches but that these patterns might not be reflected at the stream network scale. In contrast, we predicted that late in the wet season, assemblages in intermittent reaches would recover and α, β, and network diversity would be similar between intermittent and perennial reaches. These predictions were tested with macroinvertebrate assemblages in an eastern Oregon stream network.Early in the wet season, α-diversity and network diversity were lower in intermittent than perennial reaches; however, β-diversity was similar between the two types of reaches. Late in the wet season, both α-diversity and β-diversity were similar between intermittent and perennial reaches, suggesting recovery of intermittent reaches from drying. However, at the network scale, intermittent reaches continued to have lower diversity indicating a lack of recovery. Rare taxa were particularly vulnerable to flow intermittency. Our results indicate that a consideration of spatial scale, taxa abundance/rarity, and timing of sampling will improve our understanding of the effect of flow intermittence on diversity.

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Section: Methodsmentioning

confidence: 99%

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

Wooster

DeBano

2018

River Research & Apps

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“…Existing vegetation in the basin has been significantly modified from historic conditions. Land use practices over the past one hundred years have cleared the deciduous trees, which were once abundant in riparian areas (Contor et al, 1996). Vegetation reduction and suppression via timber harvest, grazing, and tilled agriculture is extensive in upland and riparian areas yet conditions remain essentially unmodified within wilderness areas.…”

Section: Study Areamentioning

confidence: 99%

“…From 1993 to 1995, CTUIR conducted studies to evaluate adult salmonid passage in the lower Umatilla River with radiotelemetry (Contor et al, 1996).…”

Section: Passage Improvementsmentioning

confidence: 99%

“…The 1995 passage evaluation revealed that adult spring chinook and steelhead required an average of 18 days and 36 days, respectively, to migrate from Three Mile Dam to above Stanfield Dam, a distance of 47 km. Steelhead have been shown to travel 6-8 km per day in an unobstructed river (Contor et al, 1996); however, due to delays at barriers in the Umatilla River, steelhead traveled an average of only 1.3 km per day. The radiotelemetry studies indicated delays of all species at all diversion dams and ladders (Contor et al, 1996). Salmonids in the Umatilla River required active transport during periods of inadequate passage.…”

Section: Passage Improvementsmentioning

confidence: 99%

“…The problem was the existence of low flows and high temperatures during fall migration when adults may have been discouraged from entering the Umatilla Basin (Carmichael, 1997). Previous evaluations suggested that flows of 4.2 m3s1 are necessary in the Umatilla River to attract fall chinook and coho runs through migration peaks in the Columbia River and to minimize straying and late entry of fish (Contor et al, 1996). Straying data from the Umatilla River indicates that fall chinook straying has decreased by 57.7 percent and coho by 17.0 percent since the implementation of flow enhancement efforts in 1993.…”

Section: Fish Productionmentioning

confidence: 99%

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ANADROMOUS SALMONID RECOVERY IN THE UMATILLA RWER BASIN, OREGON: A CASE STUDY¹

Phillips¹,

Ory²,

Talbot³

2000

J American Water Resour Assoc

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The Umatilla River Basin Fisheries Restoration Plan was initiated in the early 1980s to mitigate salmonid losses caused by hydroelectric development and habitat degradation. The objectives are to enhance the abundance of endemic steelhead and reintroduce extirpated chinook and coho salmon. The project prompted collaborative effort among federal, state, and tribal agencies, and local water users. It has incorporated habitat restoration, flow enhancement, fish passage improvements, and population supplementation through artificial production. Water exchanges have successfully increased minimum flows during spring and fall migration. While flows remain depressed compared to historic conditions, there is potential for improved habitat, passage, and homing. The mean adult‐to‐adult return rate of hatchery‐reared steelhead exceeded replacement and that of the naturally‐spawning population. Although the smolt‐to‐adult survival rates of hatchery‐reared fish fluctuate, salmonid escapement has increased in recent years, permitting steelhead and spring chinook harvest. Enumeration of potential spawners and observed redds reveals an increase in natural production of all supplemented species. Comparison of hatchery‐reared and naturally‐spawning steelhead populations revealed differences in life history characteristics (in age composition and sex ratios) though run timing and genetic stock compositions of the two components of the populations have not differed. Sustained monitoring is needed to determine benefits of integrating habitat restoration and artificial production in restoring salmonid populations.

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Evaluation of Juvenile Salmonid Outmigration and Survival in the Lower Umatilla River Basin, Annual Report 1999-2000.

Knapp¹,

Carmichael²,

Ehlers³

2002

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Umatilla Basin Natural Production Monitoring and Evaluation; 1994-1995 Annual Report.

Cited by 4 publications

References 0 publications

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

ANADROMOUS SALMONID RECOVERY IN THE UMATILLA RWER BASIN, OREGON: A CASE STUDY¹

Evaluation of Juvenile Salmonid Outmigration and Survival in the Lower Umatilla River Basin, Annual Report 1999-2000.

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Umatilla Basin Natural Production Monitoring and Evaluation; 1994-1995 Annual Report.

Cited by 4 publications

References 0 publications

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

The importance of scale in understanding the effect of stream intermittence on aquatic macroinvertebrate diversity

ANADROMOUS SALMONID RECOVERY IN THE UMATILLA RWER BASIN, OREGON: A CASE STUDY1

Evaluation of Juvenile Salmonid Outmigration and Survival in the Lower Umatilla River Basin, Annual Report 1999-2000.

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ANADROMOUS SALMONID RECOVERY IN THE UMATILLA RWER BASIN, OREGON: A CASE STUDY¹