Preliminary Estimates of Loss of Juvenile Anadromous Salmonids to Predators in John Day Reservoir and Development of a Predation Model [electronic resource] : Interim Report, 1986.
We made preliminary estimates of the loss of juvenile salmonids to predation by walleye, Stizostedion v. vitreum, and northern squawfish, Ptychocheilus oregonensis, in John Day Reservoir in 1984 and 1985 using estimates of predator abundance and daily prey consumption rates. Preliminary estimates ma...
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| Format: | Government Document Electronic eBook |
| Language: | English |
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Portland, Ore. : Oak Ridge, Tenn. :
United States. Bonneville Power Administration ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1986.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Preliminary Estimates of Loss of Juvenile Anadromous Salmonids to Predators in John Day Reservoir and Development of a Predation Model |h [electronic resource] : |b Interim Report, 1986. |
| 260 | |a Portland, Ore. : |b United States. Bonneville Power Administration ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 1986. | ||
| 300 | |a 58 pages : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
| 337 | |a computer |b c |2 rdamedia. | ||
| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through SciTech Connect. | ||
| 500 | |a 03/01/1986. | ||
| 500 | |a "doe/bp35097-4" | ||
| 500 | |a "DE87010557" | ||
| 500 | |a Rieman, Bruce E. | ||
| 520 | 3 | |a We made preliminary estimates of the loss of juvenile salmonids to predation by walleye, Stizostedion v. vitreum, and northern squawfish, Ptychocheilus oregonensis, in John Day Reservoir in 1984 and 1985 using estimates of predator abundance and daily prey consumption rates. Preliminary estimates may be biased and may be adjusted as much as 30%, but indications are that predation could account for the majority of unexplained loss of juvenile salmonids in John Day Reservoir. Total loss was estimated at 4.1 million in 1984 and 3.3 million in 1985. Northern squawfish consumed 76% and 92% of these totals, respectively. The majority of loss occurred in mid reservoir areas, but loss in a small area, the boat-restricted zone immediately below McNary Dam, was disproportionately large. Peaks in loss in May and July corresponded with peaks in availability of salmonids. Estimated mortality from predation for April through June in 1984 and 1985 was 9% and 7% respectively, for chinook salmon, Oncorhynchus tshawytscha, and 10% and 15% for steelhead, Salmogairdneri. Mortality was variable with time but tended to increase over the period of migration. Mortality of chinook was estimated at 26% to 55% during July and August. A model of predation in John Day Reservoir is outlined. The model includes a predation submodel that can calculate loss from predator number and consumption rate; a population submodel that can relate predator abundance and population structure to recruitment, exploitation, natural mortality and growth; and a distribution submodel that can apportion predators among areas of the reservoir over time. Applications of the model are discussed for projecting expected changes in predation over time and identifying management alternatives that might limit the impact of predation. | |
| 520 | 0 | |a Salmonidae - John Day Reservoir (Wash. And Or.) - Mortality. | |
| 536 | |b AI79-82BP35097. | ||
| 650 | 7 | |a Salmon. |2 local. | |
| 650 | 7 | |a Predator-Prey Interactions. |2 local. | |
| 650 | 7 | |a Columbia River. |2 local. | |
| 650 | 7 | |a Trout. |2 local. | |
| 650 | 7 | |a Dams. |2 local. | |
| 650 | 7 | |a Juveniles. |2 local. | |
| 650 | 7 | |a Mathematical Models. |2 local. | |
| 650 | 7 | |a Migration. |2 local. | |
| 650 | 7 | |a Water Reservoirs. |2 local. | |
| 650 | 7 | |a Anadromous Fishes. |2 local. | |
| 650 | 7 | |a Animals. |2 local. | |
| 650 | 7 | |a Aquatic Organisms. |2 local. | |
| 650 | 7 | |a Fishes. |2 local. | |
| 650 | 7 | |a Rivers. |2 local. | |
| 650 | 7 | |a Streams. |2 local. | |
| 650 | 7 | |a Surface Waters. |2 local. | |
| 650 | 7 | |a Vertebrates. |2 local. | |
| 650 | 7 | |a Hydro Energy. |2 edbsc. | |
| 710 | 2 | |a Oregon. |b Department of Fish and Wildlife. |4 res. | |
| 710 | 1 | |a United States. |b Bonneville Power Administration. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
| 856 | 4 | 0 | |u http://www.osti.gov/scitech/biblio/6386384 |z Online Access (via OSTI) |
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