Index Catalog // ScholarsArchive@OSU

Greater sage-grouse vital rates after wildfire

Creator:: Foster, Lee J., Dugger, Katie M., Hagen, Christian A., and Budeau, David A.
Abstract:: Greater sage-grouse (Centrocercus urophasianus) have been subject to long-term and continuing declines in population and habitat since European settlement of western North America. Increased wildfire activity constitutes a primary threat to the species in western portions of their range, with documented declines in wildfire-affected populations. Following a 187,000-ha wildfire in...
Resource Type:: Article

Demographic response of northern spotted owls to barred owl removal

Creator:: Diller, Lowell V., Hamm, Keith A., Early, Desiree A., Lamphear, David W., Dugger, Katie M., Yackulic, Charles B., Schwarz, Carl J., Carlson, Peter C., and McDonald, Trent L.
Abstract:: Federally listed as threatened in 1990 primarily because of habitat loss, the northern spotted owl (Strix occidentalis caurina) has continued to decline despite conservation efforts resulting in forested habitat being reserved throughout its range. Recently, there is growing evidence the congeneric invasive barred owl (Strix varia) may be responsible for...
Resource Type:: Article

Re-Occupancy of Breeding Territories by Ferruginous Hawks in Wyoming: Relationships to Environmental and Anthropogenic Factors

Creator:: Wallace, Zachary P., Kennedy, Patricia L., Squires, John R., Oakleaf, Robert J., Olson, Lucretia E., and Dugger, Katie M.
Abstract:: Grassland and shrubland birds are declining globally due in part to anthropogenic habitat modification. Because population performance of these species is also influenced by non-anthropogenic factors, it is important to incorporate all relevant ecological drivers into demographic models. We used design-based sampling and occupancy models to test relationships of environmental...
Resource Type:: Article

Population dynamics of mallards breeding in eastern Washington

Creator:: Dugger, Bruce D., Coluccy, John M., Dugger, Katie M., Fox, Trevor T., Kraege, Don, and Petrie, Mark J.
Abstract:: Variation in regional population trends for mallards breeding in the western United States indicates that additional research into factors that influence demographics could contribute to management and understanding the population demographics of mallards across North America. We estimated breeding incidence and adult female, nest, and brood survival in eastern Washington...
Resource Type:: Article

Differences in Adélie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet

Creator:: Jennings, Scott, Varsani, Arvind, Dugger, Katie M., Ballard, Grant, and Ainley, David G.
Abstract:: Sexually size-dimorphic species must show some difference between the sexes in growth rate and/or length of growing period. Such differences in growth parameters can cause the sexes to be impacted by environmental variability in different ways, and understanding these differences allows a better understanding of patterns in productivity between individuals...
Resource Type:: Article

The effects of habitat, climate, and Barred Owls on long-term demography of Northern Spotted Owls

Creator:: Dugger, Katie M., Forsman, Eric D., Franklin, Alan B., Davis, Raymond J., White, Gary C., Schwarz, Carl J., Burnham, Kenneth P., Nichols, James D., Hines, James E., Yackulic, Charles B., Doherty, Paul F. Jr, Bailey, Larissa, Clark, Darren A., Ackers, Steven H., Andrews, Lawrence S., Augustine, Benjamin, Biswell, Brian L., Blakesley, Jennifer, Carlson, Peter C., Clement, Matthew J., Diller, Lowell V., Glenn, Elizabeth M., Green, Adam, Gremel, Scott A., Herter, Dale R., Higley, J. Mark, Hobson, Jeremy, Horn, Rob B., Huyvaert, Kathryn P., McCafferty, Christopher, McDonald, Trent, McDonnell, Kevin, Olson, Gail S., Reid, Janice A., Rockweit, Jeremy, Ruiz, Viviana, Saenz, Jessica, and Sovern, Stan G.
Abstract:: Estimates of species' vital rates and an understanding of the factors affecting those parameters over time and space can provide crucial information for management and conservation. We used mark–recapture, reproductive output, and territory occupancy data collected during 1985–2013 to evaluate population processes of Northern Spotted Owls (Strix occidentalis caurina) in...
Resource Type:: Article

Factors driving Adélie penguin chick size, mass and condition at colonies of different sizes in the Southern Ross Sea

Creator:: Whitehead, Amy L., Lyver, Phil O'B., Ballard, Grant, Barton, Kerry, Karl, Brian J., Dugger, Katie M., Jennings, Scott, Lescroël, Amelie, Wilson, Peter R., and Ainley, David G.
Abstract:: Body size, mass and condition can affect an organism’s ability to cope with variation in resource availability or metabolic demand, particularly as juveniles reach independence. It follows that changes to parental provisioning efficiency (size and frequency of meals) through intraspecific competition or environmental conditions that affect prey availability may affect...
Resource Type:: Article

Roosting Habitat Use and Selection By Northern Spotted Owls During Natal Dispersal

Creator:: Sovern, Stan G., Forsman, Eric D., Dugger, Katie M., and Taylor, Margaret
Abstract:: We studied habitat selection by northern spotted owls (Strix occidentalis caurina) during natal dispersal in Washington State, USA, at both the roost site and landscape scales. We used logistic regression to obtain parameters for an exponential resource selection function based on vegetation attributes in roost and random plots in 76...
Resource Type:: Article

The evolution of mapping habitat for northern spotted owls (Strix occidentalis caurina): A comparison of photo-interpreted, Landsat-based, and lidar-based habitat maps

Creator:: Ackers, Steven H., Davis, Raymond J., Olsen, Keith A., and Dugger, Katie M.
Abstract:: Wildlife habitat mapping has evolved at a rapid pace over the last few decades. Beginning with simple, often subjective, hand-drawn maps, habitat mapping now involves complex species distribution models (SDMs) using mapped predictor variables derived from remotely sensed data. For species that inhabit large geographic areas, remote sensing technology is...
Resource Type:: Article

Stable occupancy by breeding hawks (Buteo spp.) over 25 years on a privately managed bunchgrass prairie in northeastern Oregon, USA

Creator:: Kennedy, Patricia L., Bartuszevige, Anne M., Houle, Marcy, Humphrey, Ann B., Dugger, Katie M., and Williams, John
Abstract:: Potential for large prairie remnants to provide habitat for grassland-obligate wildlife may be compromised by nonsustainable range-management practices. In 1979–1980, high nesting densities of 3 species of hawks in the genus Buteo—Ferruginous Hawk (Buteo regalis), Red-tailed Hawk (B. jamaicensis), and Swainson’s Hawk (B. swainsoni)—were documented on the Zumwalt Prairie and...
Resource Type:: Article

Climate Change Winners: Receding Ice Fields Facilitate Colony Expansion and Altered Dynamics in an Adélie Penguin Metapopulation

Creator:: LaRue, Michelle A., Ainley, David G., Swanson, Matt, Dugger, Katie M., Lyver, Phil O'B., Barton, Kerry, and Ballard, Grant
Abstract:: There will be winners and losers as climate change alters the habitats of polar organisms. For an Adelie penguin (Pygoscelis adeliae) colony on Beaufort Island (Beaufort), part of a cluster of colonies in the southern Ross Sea, we report a recent population increase in response to increased nesting habitat as...
Resource Type:: Article

Survival and Home-range Size of Northern Spotted Owls in Southwestern Oregon

Creator:: Schilling, Jason W., Dugger, Katie M., and Anthony, Robert G.
Abstract:: In the Klamath province of southwestern Oregon, Northern Spotted Owls (Strix occidentalis caurina) occur in complex, productive forests that historically supported frequent fires of variable severity. However, little is known about the relationships between Spotted Owl survival and home-range size and the characteristics of fire-prone, mixed-conifer forests of the Klamath...
Resource Type:: Article

Long-term decline of a winter-resident bird community in Puerto Rico

Creator:: Faaborg, John, Arendt, Wayne J., Toms, Judith D., Dugger, Katie M., Cox, W. Andrew, and Mora, Miguel Canals
Abstract:: Despite concern expressed two decades ago, there has been little recent discussion about continuing declines of migrant bird populations. Monitoring efforts have been focused almost exclusively on the breeding grounds. We describe the long-term decline of a winter-resident bird population in Guánica Commonwealth Forest, Puerto Rico, one of the last...
Resource Type:: Article

ScholarsArchive@OSU

Greater sage-grouse vital rates after wildfire

Demographic response of northern spotted owls to barred owl removal

Re-Occupancy of Breeding Territories by Ferruginous Hawks in Wyoming: Relationships to Environmental and Anthropogenic Factors

Population dynamics of mallards breeding in eastern Washington

Differences in Adélie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet

The effects of habitat, climate, and Barred Owls on long-term demography of Northern Spotted Owls

Factors driving Adélie penguin chick size, mass and condition at colonies of different sizes in the Southern Ross Sea

Roosting Habitat Use and Selection By Northern Spotted Owls During Natal Dispersal

The evolution of mapping habitat for northern spotted owls (Strix occidentalis caurina): A comparison of photo-interpreted, Landsat-based, and lidar-based habitat maps

Stable occupancy by breeding hawks (Buteo spp.) over 25 years on a privately managed bunchgrass prairie in northeastern Oregon, USA

Climate Change Winners: Receding Ice Fields Facilitate Colony Expansion and Altered Dynamics in an Adélie Penguin Metapopulation

Survival and Home-range Size of Northern Spotted Owls in Southwestern Oregon

Long-term decline of a winter-resident bird community in Puerto Rico

Limit your search

Academic Affiliation

Creator

Date

Decade

Language

License

Peer Reviewed

Resource Type

Rights Statement

Search Constraints

Search Results

Limit your search