Avian Predation on Juvenile Salmonids in the Lower Columbia River: 1998 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 vulnerability of 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:
- Columbia River Inter-Tribal Fish Commission; Oregon State Univ., Corvallis, OR (United States)
- Sponsoring Organization:
- United States. Bonneville Power Administration.
- DOE Contract Number:
- 1997BI33475
- OSTI ID:
- 756492
- Report Number(s):
- DOE/BP-33475-2; TRN: AH200104%%457
- Resource Relation:
- Other Information: PBD: 1 Apr 2000; PBD: 1 Apr 2000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
BREEDING
COLUMBIA RIVER
CONSUMPTION RATES
DIET
FORAGE
HABITAT
JUVENILES
POPULATIONS
SEASONS
TRAJECTORIES
SEA BIRDS - FEEDING AND FEEDS - COLUMBIA RIVER ESTUARY
PREDATION (BIOLOGY)
SALMONIDAE - MIGRATION - COLUMBIA RIVER (OR. AND WASH.) - SALMONIDAE - MORTALITY