Assessing cumulative impacts to wintering Bald Eagles and their habitats in western Washington
Bald Eagles (Haliaeetus leucocephalus) of Washington, the largest wintering population in the lower 48 states, are subject to numerous pressures and impacts from human activites. An evaluative method potential cumulative impacts of multiple hydroelectric development and logging activities on known and potential eagle use areas. Four resource components include food supply, roost sites, mature riparian forest, and disturbance. In addition to actual estimates of losses in food supply (fish biomass in kg) and habitat (km/sup 2/) in one river basin, impact levels from 0 (none) to 4 (high) were assigned for each development and for each component based on the impacts anticipated and the estimated value of the site to eagles. Midwinter eagle surveys, aerial photography, topographic and forest stand maps, and site visits were used in the analysis. Impacts were considered additive for all but the disturbance component, which was adjusted for potential synergism between developments. Adjustments were made for mitigation before the impacts were aggregated into a single, dimensionless cumulative impact score. 50 refs., 1 fig., 1 tab.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6959799
- Report Number(s):
- CONF-8806163-1; ON: DE88011955
- Resource Relation:
- Conference: Ecosystems management conference: rare species and significant habitats, Syracuse, NY, USA, 6 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
BIOLOGICAL STRESS
SEASONAL VARIATIONS
BIRDS
HYDROELECTRIC POWER PLANTS
ENVIRONMENTAL IMPACTS
ENDANGERED SPECIES
ENVIRONMENTAL EFFECTS
EVALUATION
HABITAT
HUMAN POPULATIONS
HYDROELECTRIC POWER
MITIGATION
WASHINGTON
ANIMALS
ELECTRIC POWER
ENERGY SOURCES
FEDERAL REGION X
NORTH AMERICA
POPULATIONS
POWER
POWER PLANTS
RENEWABLE ENERGY SOURCES
USA
VARIATIONS
VERTEBRATES
130600* - Hydro Energy- Environmental Aspects
510500 - Environment
Terrestrial- Site Resource & Use Studies- (-1989)