Accession Number : ADA281898

Title :   Environmental Factors Influencing Turkey Vulture Distribution and Abundance: A Geographic Information System Application Study.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Defusco, Russell P.

Report Date : 1994

Pagination or Media Count : 129

Abstract : The objective of this study was to use physiographic, geographic, and climatic correlates to describes and interpret the breeding and wintering distribution and abundance patterns of Turkey Vultures (Cathartes aura) in the continental United States. Thirty years of data from the National Audubon Society's Christmas Bird Count and the National Biological Survey's Breeding Bird Survey were correlated with remotely sensed and ground sampled environmental data in a raster-based geographic information system. Environmental factors evaluated include elevation, hydrography, thermal reflectance, temperature, precipitation, snow cover, number of frost-free days, vegetation types, and ecoregions, for each l Km2 block of the continental United States. A geographic information system overlay process was used to determine statistical relationships between individual and combinations of environmental factors, and sampled vulture data

Descriptors :   *BIRDS, *ENVIRONMENTAL TESTS, CLIMATE, COLD WEATHER, SURVEYS, GEOGRAPHY, TEMPERATURE, BIOLOGICAL RHYTHMS.

Subject Categories : Anatomy and Physiology
      Environmental Health and Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE