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Population Dynamics of the Endangered Black-capped Vireo (Vireo atricapilla)
Landscape heterogeneity and fragmentation create local populations that differ in habitat availability and predator communities and present unique tradeoffs between reproductive success and survival. Varying demography across the landscape can result in a metapopulation structure and the recognition of source-sink dynamics ...
Black-capped Vireos and White-eyed Vireos: How two birds adapt to challenges of living in Central Texas
Black-capped vireos (Vireo atricapilla) and white-eyed vireos (Vireo griseus) are closely related songbirds, which occupy the same landscape in Central Texas. While white-eyed vireos are common and widespread, black-capped vireos are federally endangered with a restricted distribution. Both species are vulnerable to brown-headed ...
Eastern Gray Squirrel Ecology and Interactions with Western Gray Squirrels
(2013-07-23)
Populations of State-threatened western gray squirrels (<italic>Sciurus griseus</italic>) have declined in areas invaded by introduced eastern gray squirrels (<italic>S. carolinensis</italic>) in the Western United States, but little is known about competitive interactions between these species. The western gray squirrel is ...
Predator species identification from saliva at kill sites with limited remains
Kill site investigations can provide valuable data about elusive predator species and predator-prey interactions for wildlife scientists and managers alike. However, the predator species must be definitively identified as the one responsible for the predation event. The traditional method of visually analyzing prey remains ...
Using non-invasive techniques to examine black bear (Ursus americanus) abundance in the North Cascades Ecosystem, Washington State
(2013-07-25)
Recent advances in non-invasive research methods have facilitated less costly evaluations of bear populations across wide geographic ranges. Non-invasive hair-snagging and genetic tagging allow identification of species, sex, and individual bears without necessitating direct capture or observation. From 2008 to 2011 a large, ...
The Water Monitor Lizard Varanus salvator: Behavior, Ecology, and Human Dimensions in Banten, Indonesia
The water monitor lizard, Varanus salvator, is a large, ecologically flexible species commonly found in areas of human disturbance throughout its Southeast Asian range. The presence of anthropogenic resource subsidies may influence V. salvator behavior in such areas, potentially altering the social structure, ranging activity, ...
Assessing the Effects of Tropical Land Use Change: A Camera Trapping Study of Terrestrial Peruvian Mammals
Previous research shows that most mammals are reduced in fragmented forests, particularly species averse to human-modified landscapes. Since felids are elusive, sometimes nocturnal, and usually inhabit interior forest away from human activity, they can be difficult to study through in-person field observations. One effective ...
Barred Owls and Northern Spotted Owls in the Eastern Cascade Range, Washington
(2013-07-23)
Competitive interactions with barred owls (Strix varia) are an important factor contributing to the observed decline in the northern spotted owl (Strix occidentallis caurina) population in Washington. My goal was to develop an understanding of barred owl habitat associations at spatial scales corresponding to home ranges and ...
Urbanization alters the influence of weather and primary productivity on avian populations in the Seattle metropolitan area
(2014-04-30)
Two novel, abiotic challenges that affect primary productivity, and the biodiversity dependent upon it, are urbanization and climate change. Increased levels of urbanization cause an inversely proportional decrease in primary productivity, while climate change promises concurrent changes in temperature and precipitation. ...
Identification Of Habitat Controls On Amphibian Populations: The Northern Red-Legged Frog In The Pacific Northwest
(2013-07-25)
Historically, research addressing vulnerability of stillwater-breeding amphibians focused on reproductive (aquatic) habitat. However, in the Pacific Northwest (PNW), terrestrial (active-season) habitat is also important to many stillwater-breeding amphibians though its importance has rarely been evaluated. Locally, these ...