System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs [electronic resource] : Annual Report of Research 1990.
Salmonidae - Columbia River - Mortality.
Saved in:
| Online Access: |
Online Access (via OSTI) |
|---|---|
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Portland, Ore. : Oak Ridge, Tenn. :
United States. Bonneville Power Administration ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1991.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a System-Wide Significance of Predation on Juvenile Salmonids in Columbia and Snake River Reservoirs |h [electronic resource] : |b Annual Report of Research 1990. |
| 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 1991. | ||
| 300 | |a 57 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 03/01/1991. | ||
| 500 | |a "doe/bp-07096-1" | ||
| 500 | |a "DE91009784" | ||
| 500 | |a Petersen, C.J. | ||
| 500 | |a US Fish and Wildlife Service. | ||
| 520 | 3 | |a The consumption rates of northern squawfish (Ptychocheilus oregonensis) preying upon juvenile salmonids were indexed in four reservoirs (Bonneville, The Dalles, John Day and McNary) of the lower Columbia River. During the spring and summer of 1990, over 2000 northern squawfish were collected from dam forebays, dam tailraces and mid-reservoir locations. Gut content data, predator weight and water temperature were used to compute a consumption index (CI) for northern squawfish. Juvenile salmonids were found in 435 of 1598 northern squawfish guts analyzed. Besides salmonids and other preyfish, crustaceans formed a significant portion of the diet. The CI of northern squawfish varied by season and location. At most locations, summer CI's of northern squawfish were higher than in the spring. Efforts to match sample collection with times of highest juvenile salmonid passage were successful except during July at The Dalles and Bonneville Reservoirs. Consumption indices were moderate to high at several locations even when passage was relatively low, suggesting salmonid predation rate by northern squawfish was not always a function of prey density. 19 refs., 5 figs., 12 tabs. | |
| 520 | 0 | |a Salmonidae - Columbia River - Mortality. | |
| 536 | |b AI79-90BP07096. | ||
| 650 | 7 | |a Bonneville Power Administration. |2 local. | |
| 650 | 7 | |a Environmental Impacts. |2 local. | |
| 650 | 7 | |a Fishes. |2 local. | |
| 650 | 7 | |a Biological Stress. |2 local. | |
| 650 | 7 | |a Columbia River. |2 local. | |
| 650 | 7 | |a Juveniles. |2 local. | |
| 650 | 7 | |a Mortality. |2 local. | |
| 650 | 7 | |a Population Dynamics. |2 local. | |
| 650 | 7 | |a Progress Report. |2 local. | |
| 650 | 7 | |a Snake River Plain. |2 local. | |
| 650 | 7 | |a Animals. |2 local. | |
| 650 | 7 | |a Aquatic Organisms. |2 local. | |
| 650 | 7 | |a Document Types. |2 local. | |
| 650 | 7 | |a National Organizations. |2 local. | |
| 650 | 7 | |a Rivers. |2 local. | |
| 650 | 7 | |a Streams. |2 local. | |
| 650 | 7 | |a Surface Waters. |2 local. | |
| 650 | 7 | |a Us Doe. |2 local. | |
| 650 | 7 | |a Predator-Prey Interactions. |2 local. | |
| 650 | 7 | |a Us Organizations. |2 local. | |
| 650 | 7 | |a Vertebrates. |2 local. | |
| 650 | 7 | |a Basic Biological Sciences. |2 edbsc. | |
| 650 | 7 | |a Environmental Sciences. |2 edbsc. | |
| 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. | |
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