Life Sciences Commons^™

An Investigation Of The Environmental Relationships Of Selected Forest Habitat Types In Northern Utah, Penelope Morgan Lawton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It was the purpose of this study to examine an assumption basic to the forest habitat type classification system. Included in each habitat type is all land capable of supporting a single climax plant community type. In practice, land is grouped based on species camposition, relative abundance, and successional trends of the vegetation supported by the land. Land units of the same habitat type are assumed to represent similar environments. No previous critical evaluation of this assumption has been done.

Land in the study area had been previously classified under the habitat type system. Relationships between vegetation and environment were …

Breeding Ecology Of The Ferruginous Hawk In Northern Utah And Southern Idaho, Richard P. Howard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Forty-three and 54 Ferruginous hawk (Buteo regalis) pairs were found occupying territories in northern Utah and southeastern Idaho during 1972 and 1973, respectively. Of these 38 and 27 nesting pairs laid eggs. Nesting success was 77.1 percent in 1972 and 74.6 percent in 1973. for successful nests, an average of 2.9 and 2.6 young hatched and 2.7 and 2.3 young fledged during the respective years. This population is reproductively comparable to others in Utah and Colorado. Analysis of prey items collected from the nests indicated that black-tailed jack-rabbits (Lepus californicus) constitute 86 percent of the biomass …