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The Cooperative Research Units Program conducts research on a wide range of disciplines related to fish, wildlife, and natural resource management. Our 40 Units collectively conduct research on virtually every type of North American ecological community. 

Data and Tools Technical Publications
Filter Total Items: 104
Date published: November 9, 2020

Migration Routes of Mule Deer in Platte Valley South Population in Wyoming

Mule deer in the Platte Valley South population are part of the larger Platte Valley herd unit with an estimated population of 11,000 animals. These mule deer winter in the sagebrush canyons and basins near the Platte and Encampment Rivers, south of Saratoga, Wyoming (fig. 29). Most of these deer migrate southerly 20–70 mi (32–113 km) to portions of the Sierra Madre%

Date published: November 9, 2020

Migration Routes of Elk in the South Wind River Herd in Wyoming

Migratory movements of elk within the South Wind River herd include short (i.e., 10 miles) to medium (i.e., 40 miles) distance migrations generally from low elevation winter ranges along the foothills to high elevation summer ranges within the Wind River Range. Elk movements along the west side of the Winds trend southwesterly from summer ranges to winter ranges, largely dependent u

Date published: November 9, 2020

Winter Ranges of Mule Deer in the Kaibab North Herd in Arizona

Mule deer of the Kaibab North herd on the Kaibab Plateau are treasured for their historic and contemporary significance in North America. They are the densest population of mule deer in Arizona, with an estimate of 10,200 individuals in 2019. This report compiles two research efforts, the first completed by Arizona Game and Fish Department in 2014, and the second from Utah Division of Wil

Date published: November 9, 2020

Migration Corridors of Pronghorn in the South of Interstate 40 Herd in Arizona

Interest in the movement of pronghorn south of Arizona’s Interstate 40 (I-40) began when telemetry data from 1999 – 2004 showed seasonal round-trip movements upwards of 100 miles. In 2018, high-resolution GPS location data confirmed persistence of this remarkable pronghorn migration. This herd resides primarily in Game Management Unit 8, which had a population estimate of

Date published: November 9, 2020

Migration stopovers of mule deer in the South Tuscarora Mountains, Nevada

Mule deer in the South Tuscarora herd are part of the larger “Area 6” deer population that reside in the southern and eastern portion of this big game Management Area (MA 6). The winter range for this sub population is located along the western slopes of the Tuscarora Mountains and the Dunphy Hills. The spring migration route for this deer herd traverses north along the toe

Date published: November 9, 2020

Migration Routes of Elk in Clarks Fork, Wyoming

Elk within the Clarks Fork herd migrate though some of the most rugged and remote terrain in the lower 48 states. The herd, which numbers around 3,000, winters in the Sunlight Basin and the Absaroka foothills just west of Cody, WY. Winter ranges are a mix of sagebrush hills and lodgepole pine forests, within expansive private ranchlands. During migration, animals travel an average one

Date published: November 9, 2020

Migration Routes of Mule Deer in the Kaibab North Herd in Arizona

Mule deer of the Kaibab North herd on the Kaibab Plateau are treasured for their historic and contemporary significance in North America. They are the densest population of mule deer in Arizona, with an estimate of 10,200 individuals in 2019. This report compiles two research efforts, the first completed by Arizona Game and Fish Department in 2014, and the second from Utah Division of Wil

Date published: November 9, 2020

Migration Stopovers of Elk in the Interstate 17 Herd in Arizona

The Interstate 17 (I-17) elk herd primarily resides in Arizona’s GMU 6A and 11M south of Flagstaff. The population estimate for elk in GMU 6A was 6,500 in 2019. Their summer range consists of gentle topography with ponderosa pine forest and interspersed riparian-meadow habitat. Annually, the I-17 elk herd migrates an average of 24 miles to lower-elevation winter range dominated by

Date published: November 9, 2020

Migration Routes of Mule Deer in the San Francisco Peaks Herd in Arizona

In 2008, 13 mule deer were GPS collared near the South Rim of the Grand Canyon to understand the impact of Arizona’s State Route 64 on mule deer movement. Unexpectedly, 4 individuals migrated over 50 miles to summer range near the San Francisco Peaks, north of Flagstaff, containing alpine, subalpine, and ponderosa pine habitats. The GPS collars dropped in 2009, but questions

Date published: September 11, 2020

Nesting habitat suitability for the Black-capped Petrel Pterodroma hasitata on Hispaniola, Supplementary Material

To focus nest-search efforts on Hispaniola and estimate the extent of the available nesting habitat, we analyzed the environmental characteristics of Black-capped Petrel (Pterodroma hasitata) nesting habitat and modeled suitable habitat on Hispaniola using openly available environmental datasets. Details on the methodology may be found in the associated publication (Satgé et al. 2020

Date published: September 1, 2020

Migration Corridors (WGFD Designated) of Mule Deer in the Platte Valley Herd in Wyoming

The Platte Valley Herd Corridor was designated by the Wyoming Game and Fish Department in 2018 (fig. 30). The Platte Valley herd contains approximately 11,000 mule deer. The corridor is based on two wintering populations, including a south segment from Saratoga, Wyoming, to the Colorado State line, and a north segment from Saratoga to the Dana Ridge area north of I-80. Winter ranges

Date published: June 30, 2020

All available data for Sergeant et al. 2020, A classification of streamflow patterns across the coastal Gulf of Alaska

This .zip file contains four products that will allow users to recreate the analyses and spatial data figures used in Sergeant et al. 2020, A classification of streamflow patterns across the coastal Gulf of Alaska: 1) Autoclass input and output files (provided as folders with multiple simple text files), 2) Classification data (.csv file) for individual watersheds, including

Filter Total Items: 2,921
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Year Published: 2020

Use of museum specimens to refine historical pronghorn subspecies boundaries

Endangered Sonoran (Antilocapra americana sonoriensis) and Peninsular (A. a. peninsularis) pronghorn persist largely because of captive breeding and reintroduction efforts. Recovery team managers want to re-establish pronghorn in their native range, but there is currently uncertainty regarding the subspecies status of extinct pronghorn populations...

Hahn, Erin E.; Klimova, Anastasia; Munguia-Vega, Adrian; Clark, Kevin B.; Culver, Melanie

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Year Published: 2020

Conserving transboundary wildlife migrations: Recent insights from the Greater Yellowstone Ecosystem

Animal migrations are ecologically, culturally, and economically important. Ungulate populations in many parts of Africa, Asia, Europe, and the Americas migrate long distances to access seasonally available resources, traversing vast landscapes in large numbers. Yet some migrations are declining, raising concerns among scientists and natural...

Middleton, Arthur D.; Sawyer, Hall; Merkle, Jerod A.; Kauffman, Matthew; Cole, Eric. K.; Dewey, Sarah R.; Gude, Justin A.; Gustine, David D.; McWhirter, Douglas E.; Proffitt, Kelly M.; White, P. J.

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Year Published: 2020

Coldwater periods in warmwater streams: Microhabitat shifts from autumn to winter by Smallmouth Bass

Seasonal and life stage variation in microhabitat use is an important driver of fish survival and bioenergetics, but knowledge of microhabitat selection during colder periods is generally lacking in warmwater streams. Our objective was to examine changes in microhabitat selection by age‐0 (TL ≤ 85 mm) and age‐1+ (TL > ...

Wolf, S.L.; Mollenhauer, R.; Brewer, Shannon K.

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Year Published: 2020

Nonlinear patterns in mercury bioaccumulation in American alligators are a function of predicted age

Mercury is a widespread, naturally occurring contaminant that biomagnifies in wetlands due to the methylation of this element by sulfate-reducing bacteria. Species that feed at the top trophic level within wetlands are predicted to have higher mercury loads compared to species feeding at lower trophic levels and are therefore...

Lawson, A.J.; Moore, Clinton T.; Rainwater, T.R.; Nilsen, F.M.; Wilkinson, P.M.; Lowers, R.H.; Guillett, L.J. Jr; McFadden, Katherine W.; Jodice, Patrick G.R.

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Year Published: 2020

Latitudinal variation in snowshoe hare (Lepus americanus) body mass: A test of Bergmann’s Rule

The relationship between body size and latitude have been the focus of dozens of studies across many species. However, results of testing Bergmann’s Rule – that organisms in colder climates or at higher latitudes possess larger body sizes – have been inconsistent across studies. We investigated whether snowshoe hares (Lepus americanus) follow the...

Gigliotti, Laura C. ; Berg, Nathan D. ; Boonstra, Rudy ; Cleveland, Shawn M.; Diefenbach, Duane R.; Gese, Eric M. ; Ivan, Jacob S. ; Kielland, Knut; Krebs, Charles J. ; Kumar, Alexander V. ; Mills, L. Scott; Pauli, Jonathan N.; Underwood, H. Brian; Wilson, Evan; Sheriff, M.J.

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Year Published: 2020

Vulnerability of resource-users in Louisiana’s oyster fishery to environmental hazards

Knowledge of vulnerability provides the foundation for developing actions that minimize impacts on people while maximizing the sustainability of ecosystem goods and services. As a result, it is becoming increasingly important to determine how resource-dependent people are vulnerable to environmental hazards. This is particularly true in coastal...

Humphries, A. T.; Josephs, L.; LaPeyre, Megan K.; Hall, S. A.; Beech, R.D.

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Year Published: 2020

Variation in selective regimes drives intraspecific variation in life-history traits and migratory behaviour along an elevational gradient

Comparative studies, across and within taxa, have made important contributions to our understanding of the evolutionary processes that promote phenotypic diversity. Trait variation along geographic gradients provides a convenient heuristic for understanding what drives and maintains diversity. Intraspecific trait variation along latitudinal...

Lundblad, Carl G.; Conway, Courtney J.

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Year Published: 2020

Predictive multi-scale occupancy models at range-wide extents: Effects of habitat and human disturbance on distributions of wetland birds

AimPredicting distributions is fundamental to ecology, yet hindered by spatially restricted sampling, scale-dependent relationships and detection error associated with field surveys. Predictive species distribution models (SDMs) are nonetheless vital for conservation of many species. We developed a framework for building predictive SDMs with multi...

Stevens, Bryan S.; Conway, Courtney J.

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Year Published: 2020

Anthropogenic land‐use change intensifies the effect of low flows on stream fishes

As ecosystems experience simultaneous disturbances, it is critical to understand how multiple stressors interact to affect ecological change. Land‐use change and extreme flow events are two important stressors that could interact to affect fish populations.We evaluated the individual and interactive effects of discharge and land‐use change...

Walker, Richard H.; Girard, Carlin E.; Alford, Samantha L.; Walters, Annika W.

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Year Published: 2020

Identifying important military installations for continental-scale conservation of marsh bird breeding habitat

Degradation of wetland ecosystems has negatively impacted many species, perhaps none more so than marsh birds that breed in vegetative emergent wetlands throughout North America. The U.S. Department of Defense manages approximately 29 million acres of land within the continental U.S., and many military installations contain wetland complexes that...

Stevens, Bryan S.; Conway, Courtney J.

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Year Published: 2020

Juvenile Sandhill Cranes exhibit wider ranging and more exploratory movements than adults during the breeding season

Sandhill Cranes Antigone canadensis exhibit delayed sexual maturity and breeding, and therefore juvenile Cranes searching for suitable territories to occupy have different ecological constraints on movements than adults, which must defend a territory and raise young. We used fine-scale GPS telemetry data to characterize and compare...

Wolfson, David W.; Fieberg, John R.; Andersen, David

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Year Published: 2020

Modeling strategies and evaluating success during repatriations of elusive and endangered species

Wildlife repatriation is an important tool to decrease extinction risk for imperiled species, but successful repatriations require significant time, resources and planning. Because repatriations can be long and expensive processes, clear release strategies and monitoring programs are essential to efficiently use resources and evaluate success....

Folt, B.; McGowan, Conor P.; Steen, D.A.; Picolomini, S.; Hoffman, M.; Godwin, J.C.; Guyer, C.