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Filtering by: Creator Myers, Katherine West Whitney Advisor Dugger, Katie M.

Top-down Influences of bald eagles on common murre populations in Oregon

Creator:

Horton, Cheryl A.

Abstract:

Populations of organisms are influenced by both top-down (predator driven) and bottom-up (environment or resource driven) effects. Seabird research has largely focused on bottom-up factors influencing reproduction, with little emphasis on top-down. Our goal was to better understand top-down impacts on colonial nesting seabirds over a range of spatio-temporal scales....

Resource Type:

Masters Thesis

Full Text:

and managers on the U.S. West Coast should expect continued impacts from Bald Eagles as the
Ringtail (Bassariscus astutus) Survival, Home Range Size, and Rest Site Use in Southwest Oregon

Creator:

Somers, Lindsay N.

Abstract:

The ringtail (Bassariscus astutus) is a small, nocturnal, meso-carnivore that occupies mid-elevation forests in the southwest portion of Oregon. Ringtail are fully protected within Oregon, but a species of conservation concern as they may be vulnerable to habitat loss and fragmentation. Limited data exists regarding ringtail ecology in forested ecosystems,...

Resource Type:

Masters Thesis

Full Text:

- west Oregon 2020-2022………………………………………………………….…..63 5.7. Tree species used as diurnal rest
Carnivore Competition: Spatial and Dietary Implications of Gray Wolf Recolonization for Cougars in Northeast Oregon

Creator:

Orning, Elizabeth Kari

Abstract:

After a 40-year absence from Oregon’s landscape, expanding gray wolf (Canis lupus) populations are reestablishing elements of interspecific competition with sympatric large carnivores, like cougars (Puma concolor). This presents new challenges for management of large carnivores and their ungulate prey populations (e.g., elk, Cervus canadensis nelsoni; mule deer, Odocoileus hemionus)...

Resource Type:

Dissertation