Avian Predation on Juvenile Salmonids in the Lower Columbia River: 1997 Annual Report.
The authors initiated a field study in 1997 to assess the impacts of fish-eating colonial waterbirds (i.e., terns, cormorants, and gulls) on the survival of juvenile salmonids in the lower Columbia River. Here the authors present results from the 1998 breeding season, the second field season of work on this project. The research objectives in 1998 were to: (1) determine the location, size, nesting chronology, nesting success, and population trajectories of breeding colonies of fish-eating birds in the lower Columbia River; (2) determine diet composition of fish-eating birds, including taxonomic composition and energy content of various prey types; (3) estimate forage fish consumption rates, with special emphasis on juvenile salmonids, by breeding adults and their young; (4) determine the relative vulnerabilit2048 different groups of juvenile salmonids to bird predation; (5) identify foraging range, foraging strategies, and habitat utilization by piscivorous waterbirds; and (6) test the feasibility of various alternative methods for managing avian predation on juvenile salmonids and develop recommendations to reduce avian predation, if warranted by the results.
- Research Organization:
- Oregon Department of Fisheries and Wildlife; Columbia River Inter-Tribal Fish Commission
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- 97BI33475
- OSTI ID:
- 5661568
- Report Number(s):
- DOE/BP-33475-1; CNN: 97-024-00
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
HYDROELECTRIC POWER PLANTS
ENVIRONMENTAL IMPACTS
FISHERIES
PRODUCTIVITY
COLUMBIA RIVER
SALMON
HABITAT
WASHINGTON
BIRDS
PREDATOR-PREY INTERACTIONS
POWER PLANTS
RIVERS
ANADROMOUS FISHES
USA
VERTEBRATES
SURFACE WATERS
FISHES
DEVELOPED COUNTRIES
NORTH AMERICA
ANIMALS
AQUATIC ORGANISMS
Salmonidae - Food - Columbia River Estuary (Or. and Wash.)
130600* - Hydro Energy- Environmental Aspects