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Avian predation on juvenile salmonids in the Lower Columbia River; 1998 annual report.

DE2001756492

Publication Date	2000
Personal Author	Collis, K.; Adamany, S.; Roby, D. D.; Craig, D. P.; Lyons, D. E.
Page Count	108
Abstract	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.
Keywords	Juvenile fish Salmonids Birds Columbia river Predation Breeding Consumption rates Diet Forage Habitat Juveniles Populations Seasons Trajectories
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200123
Contract Number	97BI33475

Avian predation on juvenile salmonids in the Lower Columbia River; 1998 annual report.

Avian predation on juvenile salmonids in the Lower Columbia River; 1998 annual report.
DE2001756492

Publication Date	2000
Personal Author	Collis, K.; Adamany, S.; Roby, D. D.; Craig, D. P.; Lyons, D. E.
Page Count	108
Abstract	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.
Keywords	Juvenile fish Salmonids Birds Columbia river Predation Breeding Consumption rates Diet Forage Habitat Juveniles Populations Seasons Trajectories
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200123
Contract Number	97BI33475