J David Wiens
Biography
Education
Ph.D., Wildlife Science, 2012, Oregon State University
M.S., Ecology, 2004, Colorado State University
B.S., Environmental Science, 1993, Northern Arizona University
Specialty
Avian ecology, conservation of threatened and endangered species, population dynamics of forest and rangeland raptor species
Science and Products
Effects of Experimental Removal of Barred Owls on Population Demography of Northern Spotted Owls in the Pacific Northwest
Barred owls (Strix varia) have expanded their geographic range from eastern to western North America, and their newly expanded range now completely overlaps that of the federally threatened northern spotted owl (S. occidentalis caurina; Gutiérrez et al. 2007, Livezey 2009,...
Threat of Invasive Barred Owls to Northern Spotted Owls and their Habitats
As an apex predator and fiercely territorial invader, barred owls at high densities have the potential to affect a variety of native wildlife through competition, niche displacement, and predation. Such impacts may be especially problematic for conservation of the federally threatened northern spotted owl, whose populations have continued to decline despite widespread protection of old forest...
Golden Eagles and Renewable Energy Development in the Western U.S.
Development of wind-power and solar facilities is expected to increase dramatically in areas occupied by golden eagles in the western U.S. Renewable energy development in areas used by golden eagles poses a unique challenge to natural resource managers because of this species’ vulnerability to collisions with wind turbines and sensitivity to changes in human land-use.
Count and detection-nondetection survey data of Barred Owls (Strix varia) in historical breeding territories of Northern Spotted Owls (Strix occidentalis caurina) in the Oregon Coast Ranges, 1995-2016
This dataset contains count and detection-nondetection data of Barred Owls from 106 historical breeding territories of Northern Spotted Owl territories (i.e. sites) in the Oregon Coast Ranges from 1995 to 2016.
Effects of experimental removal of Barred Owls on population Demography of Northern Spotted Owls in Washington and Oregon—2018 Progress Report
Populations of Northern Spotted Owls (Strix occidentalis caurina; herineafter referred to as Spotted Owl) have declined throughout the subspecies’ geographic range. Evidence indicates that competition with invading Barred Owls (S. varia) has contributed significantly to those declines. A pilot study in California showed that removal of Barred Owls...
Wiens, J. David; Dugger, Katie M.; Lesmeister, Damon B.; Dilione, Krista E.; Simon, David C.
Geographic variation in natal dispersal of Northern Spotted Owls over 28 years
The most recent comprehensive estimates of Northern Spotted Owl (Strix occidentalis caurina) natal dispersal distances were reported in 2002. Since then, Northern Spotted Owl populations have experienced substantial demographic changes, with potential attendant changes in natal dispersal distances, including temporal or geographic trends. We...
Hollenbeck, Jeff; Haig, Susan M.; Forsman, Eric D.; Wiens, David Three-dimensional partitioning of resources by congeneric forest predators with recent sympatry
Coexistence of ecologically similar species can be maintained by partitioning along one or more niche axes. Three-dimensional structural complexity is central to facilitating resource partitioning between many forest species, but is underrepresented in field-based studies. We examined resource selection by sympatric northern spotted owls (Strix...
Jenkins, Julianna M; Lesmeister, Damon B.; Wiens, David; Kane, Jonathan T; Kane, Van R.; Verschuyl, Jake V Barred owl research needs and prioritization in California
Barred owls (Strix varia) have reached high densities within the range of the northern spotted owl (S. occidentalis caurina) and are rapidly increasing in number within the range of the California spotted owl (S. o. occidentalis). Encroaching populations of barred owls pose a significant competitive threat to the viability of both spotted owl...
Peery, Zach; Wiens, David; Bown, Robin; Carlson, Peter C.; Dugger, Katie; Dumbacher, Jack; Franklin, Alan B.; Hamm, Keith A.; Higley, Mark; Keane, John J. Chapter 4: Northern spotted owl habitat and populations: Status and threats
The northern spotted owl (Strix occidentalis caurina) was listed as threatened under the Endangered Species Act in 1990 (USFWS 1990). Providing adequate amounts of suitable forest cover to sustain the subspecies was a major component of the first recovery plan for northern spotted owls (USFWS 1992) and a driver in the basic reserve design and old-...
Lesmeister, Damon B.; Davis, Ramond J; Singleton, Peter H; Wiens, David
Effects of experimental removal of Barred Owls on population demography of Northern Spotted Owls in Washington and Oregon—2017 progress report
Populations of Northern Spotted Owls (Strix occidentalis caurina; hereinafter referred to as Spotted Owl) are declining throughout this subspecies’ geographic range. Evidence indicates that competition with invading populations of Barred Owls (S. varia) has contributed significantly to those declines. A pilot study in California showed that...
Wiens, J. David; Dugger, Katie M.; Lesmeister, Damon B.; Dilione, Krista E.; Simon, David C. Golden Eagle Monitoring Plan for the Desert Renewable Energy Conservation Plan
This report describes options for monitoring the status and population trends of the golden eagle (Aquila chrysaetos) within the Desert Renewable Energy Conservation Plan (DRECP) area of Southern California in maintaining stable or increasing population in the planning area. The report profiles the ecology of golden eagles in the region and...
Wiens, David; Kolar, Patrick; Katzner, Todd E. Spatial patterns in occupancy and reproduction of Golden Eagles during drought: Prospects for conservation in changing environments
We used a broad-scale sampling design to investigate spatial patterns in occupancy and breeding success of territorial pairs of Golden Eagles (Aquila chrysaetos) in the Diablo Range, California, USA, during a period of exceptional drought (2014–2016). We surveyed 138 randomly selected sample sites over 4 occasions each year and identified 199...
Wiens, David; Kolar, Patrick; Hunt, W. Grainger; Hunt, Teresa; Fuller, Mark R.; Bell, Douglas A. Integrating count and detection–nondetection data to model population dynamics
There is increasing need for methods that integrate multiple data types into a single analytical framework as the spatial and temporal scale of ecological research expands. Current work on this topic primarily focuses on combining capture–recapture data from marked individuals with other data types into integrated population models. Yet, studies...
Zipkin, Elise F.; Rossman, Sam; Yackulic, Charles B.; Wiens, David; Thorson, James T.; Davis, Raymond J.; Grant, Evan H. Campbell
Effects of experimental removal of barred owls on population demography of northern spotted owls in Washington and Oregon—2016 progress report
Evidence indicates that competition with invasive barred owls (Strix varia) is causing rapid declines in populations of northern spotted owls (S. occidentalis caurina), and that the long-term persistence of spotted owls may be in question without additional management intervention. A pilot study in California showed that removal of barred owls in...
Wiens, J. David; Dugger, Katie M.; Lewicki, Krista E.; Simon, David C. Quantifying the demographic cost of human-related mortality to a raptor population
Raptors are exposed to a wide variety of human-related mortality agents, and yet population-level effects are rarely quantified. Doing so requires modeling vital rates in the context of species life-history, behavior, and population dynamics theory. In this paper, we explore the details of such an analysis by focusing on the demography of a...
Hunt, W. Grainger; Wiens, David; Law, Peter R.; Fuller, Mark R.; Hunt, Teresa L.; Driscoll, Daniel E.; Jackman, Ronald E.
Distribution, nesting activities, and age-class of territorial pairs of golden eagles at the Altamont Pass Wind Resource Area, California, 2014–16
The substantial numbers of golden eagles (Aquila chrysaetos) killed by collisions with oldgeneration wind turbines each year at the Altamont Pass Wind Resource Area (APWRA) in California has been well documented from previous studies. Few eagle nests have been documented in the APWRA, however, and adults and subadults 3+ years of age killed by...
Kolar, Patrick S.; Wiens, J. David
Effects of Barred Owl Removal on Population Demography of Northern Spotted Owls in Washington and Oregon, 2015–2018
A new USGS report summarizes research accomplishments and results from the first 3.5 years, 2015-2018, of a study in Oregon and Washington to determine if removing barred owls can improve population trends of Northern spotted owls.
How Spotted and Barred Owls Share the Forest
Over the past century barred owls have been expanding their range westward, encroaching into the old-forest habitat of their sister species, the federally threatened northern spotted owl. Population declines of spotted owls were originally attributed to habitat loss.
Progress Report - Effects of Experimental Removal of Barred Owls on Population Demography of Northern Spotted Owls
Evidence suggests that the long-term persistence of northern spotted owls may be in question without additional management intervention.