A stochastic, compartmental model of the migration of juvenile anadromous salmonids in the Columbia River Basin

Lee, Danny C.

doi:10.1016/0304-3800(91)90077-e

Cited by 6 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consumption of salmonids by predators may account for the majority of previously unexplained losses of juvenile salmonids in John Day Reservoir (Rieman et al 1991). Predation has also been included as an important mortality component in river passage models that are used to develop management plans for rebuilding salmon stocks (MEG 1989;Bledsoe et al 1990;CQS 1991;Lee 1991).…”

Section: Introductionmentioning

confidence: 99%

System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs : Annual Report 1992.

Petersen¹,

Poe²

1993

View full text Add to dashboard Cite

Northern sguawfish (Ptvchocheilus oreaonensis) predation on juvenile salmonids was characterized during 1992 at ten locations in the Columbia River below Bonneville Dam and at three locations in John Day Reservoir. During the spring and summer, 1,487 northern sguawfish were collected in the lower Columbia River and 202 sguawfish were sampled in John Day Reservoir. Gut content data, predator weight, and water temperature were used to compute a consumption index (CI) for northern sguawfish, and overall diet was also described. In the Columbia River below Bonneville Dam, northern sguawfish diet was primarily fish (spring 69%: summer 53%), most of which were salmonids. Salmonids were also the primary diet component in the Bonneville Dam tailrace, John Day Dam forebay and the McNary Dam tailrace. Crustaceans were the dominant diet item at the John Day mid-reservoir location, although sample sizes were small. About half of the non-salmonid preyfish were sculpins. The consumption index (CI) of northern sguawfish was generally higher during summer than during spring. The highest CI's were observed during summer in the tailrace boat restricted zones of Bonneville Dam (CI = 7.8) and McNary Dam (CI = 4.6). At locations below Bonneville Dam, CI's were relatively low near R. D. Nelle helped with field and laboratory work. Bill Nelson provided useful comments on an earlier draft of this report. This project was funded by the Bonneville Power Administration and administered by Bill Maslen.

show abstract

Section: Introductionmentioning

confidence: 99%

System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs : Annual Report 1992.

Petersen¹,

Poe²

1993

View full text Add to dashboard Cite

show abstract

“…Also, a large-scale program was started in 1990 to remove a portion of the northern pikeminnow population so as to reduce predation mortality of salmon (Beamesderfer et al 1996;Friesen and Ward 1999). The methods used to justify and evaluate these programs include monitoring the movements of radio-tagged predators and prey (Faler et al 1988;Martinelli and Shively 1997), releasing freeze-branded or coded-wire-tagged juvenile salmon (Berggren and Filardo 1993;Giorgi et al 1994), measuring growth and fecundity of predators (Parker et al 1995;Beamesderfer et al 1996), and modeling how juvenile salmonid mortality varies with predator density, river flow, and other variables Lee 1991).…”

mentioning

confidence: 99%

Development and Corroboration of a Bioenergetics Model for Northern Pikeminnow Feeding on Juvenile Salmonids in the Columbia River

Petersen

Ward

1999

Transactions of the American Fisheries Society

View full text Add to dashboard Cite

A bioenergetics model was developed and corroborated for northern pikeminnow Ptychocheilus oregonensis, an important predator on juvenile salmonids in the Pacific Northwest. Predictions of modeled predation rate on salmonids were compared with field data from three areas of John Day Reservoir (Columbia River). To make bioenergetics model estimates of predation rate, three methods were used to approximate the change in mass of average predators during 30d growth periods: observed change in mass between the first and the second month, predicted change in mass calculated with seasonal growth rates, and predicted change in mass based on an annual growth model. For all reservoir areas combined, bioenergetics model predictions of predation on salmon were 19% lower than field estimates based on observed masses, 45% lower than estimates based on seasonal growth rates, and 15% lower than estimates based on the annual growth model. For each growth approach, the largest differences in field-versus-model predation occurred at the midreservoir area (Ϫ84% to Ϫ67% difference). Model predictions of the rate of predation on salmonids were examined for sensitivity to parameter variation, swimming speed, sampling bias caused by gear selectivity, and asymmetric size distributions of predators. The specific daily growth rate of northern pikeminnow predicted by the model was highest in July and October and decreased during August. The bioenergetics model for northern pikeminnow performed well compared with models for other fish species that have been tested with field data. This model should be a useful tool for evaluating management actions such as predator removal, examining the influence of temperature on predation rates, and exploring interactions between predators in the Columbia River basin.

show abstract

“…Predation has been included as a source of mortality for migrating salmonids in several models of the Columbia River system (MEG 1989;Beamesderfer et al 1990;Bledsoe et al 1990;Lee 1991;CQS 1993) and model outputs have been used to justify and develop a large predation management program NPPC 1992;Willis and Nigro 1993). Most models developed for the Columbia River system have assumed that individual reservoirs are homogeneous (one area), or that reservoirs can be divided into two areas for which prey losses should be computed independently.…”

mentioning

confidence: 99%

Importance of Spatial Pattern in Estimating Predation on Juvenile Salmonids in the Columbia River

Petersen¹

1994

Transactions of the American Fisheries Society

View full text Add to dashboard Cite

The impact of piscivores in aquatic systems is often estimated by assuming that predation rate and predator density can be characterized as means throughout large, homogeneous areas. Predation losses of juvenile Pacific salmonids Oncorhynchus spp. migrating through Columbia River reservoirs were previously estimated with the assumption that each reservoir consisted of one or two homogeneous areas. Data from the John Day Reservoir and throughout the river system showed that predation rate and predator density vary greatly between near-dam and midreservoir areas, suggesting that reservoirs in the Columbia River should be divided into at least three or four areas for estimating salmonid losses. For example, the estimated number of salmonids annually eaten by northern squawfish Ptychocheilus oregonensis in John Day Reservoir decreased from 2.9 million when all samples in the reservoir were pooled into one area, to 1.4 million when samples were partitioned among four areas. Variance about the estimates also decreased steadily with finer partitioning. Mortality of juvenile salmon from predation was substantial with any type of partitioning; however, spatial variation in predation rates and other density-dependent processes may be especially important in river models of migrating juvenile salmon that repeatedly apply predation rates in a series of reservoirs or river reaches.

show abstract

A stochastic, compartmental model of the migration of juvenile anadromous salmonids in the Columbia River Basin

Cited by 6 publications

References 10 publications

System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs : Annual Report 1992.

System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs : Annual Report 1992.

Development and Corroboration of a Bioenergetics Model for Northern Pikeminnow Feeding on Juvenile Salmonids in the Columbia River

Importance of Spatial Pattern in Estimating Predation on Juvenile Salmonids in the Columbia River

Contact Info

Product

Resources

About