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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: 2,751
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Year Published: 2019

Population estimates of Antillean manatees in Puerto Rico: An analytical framework for aerial surveys using multi-pass removal sampling

Effective management of the threatened Antillean manatee (Trichechus manatus manatus) in Puerto Rico requires reliable estimates of population size. Estimates are needed to assess population responses to management actions, and whether recovery objectives have been met. Aerial surveys have been conducted since 1976, but none adjusted for imperfect...

Collazo, Jaime A.; Krachey, M.J.; Pollock, K.H.; Pérez-Aguilo, F.J.; Zegarra, J.P.; Mignucci-Giannoni, A.A.

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Year Published: 2019

Demographic factors affecting population growth in giant gartersnakes

Demographic models provide insight into which vital rates and life stages contribute most to population growth. Integral projection models (IPMs) offer flexibility in matching model structure to a species’ demography. For many rare species, data are lacking for key vital rates, and uncertainty might dissuade researchers from attempting to build a...

Rose, Jonathan P.; Ersan, Julia; Wylie, Glenn D.; Casazza, Michael L.; Halstead, Brian J.

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Year Published: 2019

Ecological health indicators

Contemporary policymakers rarely stress ecological knowledge, and yet this knowledge remains crucial—just as it was in prehistory—to protecting overall human well-being. Measuring carefully selected ecological health indicators—that is, signs or symptoms, especially those focused on biotic assemblages—can provide insights into the...

Angermeier, Paul L.

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Year Published: 2019

Trade-offs relating to grassland and forest mine reclamation approaches in the central Appalachian region and its implications for the songbird community

Surface mining in the Appalachian region, USA, converts large areas of mature forest to early-successional habitat. This shift in landscape structure has the potential to reduce habitat availability and suitability for forest-dwelling songbirds by reducing and fragmenting mature forest, but also to increase habitat availability for grassland and...

Wood, Petra B.; Eric L. Margenau; Cathy A. Weakland; Donald J. Brown
Margenau, Eric L.; Wood, Petra B.; Weakland, Cathy A.; Brown, Donald J. 2019. Trade-offs relating to grassland and forest mine reclamation approaches in the central Appalachian region and implications for the songbird community. Avian Conservation and Ecology. 14(1) 2. 14 p. https://doi.org/10.5751/ACE-01304-140102.

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Year Published: 2019

Bayesian statistics for beginners: A step-by-step approach

Bayesian statistics is currently undergoing something of a renaissance. At its heart is a method of statistical inference in which Bayes' theorem is used to update the probability for a hypothesis as more evidence or information becomes available. It is an approach that is ideally suited to making initial assessments based on incomplete or...

Donovan, Therese M.; Mickey, Ruth M.

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Year Published: 2019

Interactions of human-caused mortality, genetic introgression, and management among Wild Red Wolves: Developing scientific consensus

After being nearly driven to extinction by the combination of human persecution, human-caused habitat change, and subsequent hybridization with coyotes, red wolves (Canis rufus) were rescued from extinction by the establishment of a captive breeding program in 1973.  In 1987, red wolves were first released into a coyote-free (Canis latrans)...

Collazo, Jaime

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Year Published: 2019

Movement and mortality of Atlantic salmonkelts (Salmo salar) released into thePenobscot River, Maine

The Penobscot River is home to the last major run of Atlantic salmon (Salmo salar) in the United States. For over one century, the river has been stocked intensively. Since the late 1970s, most kelts are released to the Penobscot River estuary following spawning in a hatchery. Over that time, the proportion of the run made up of iteroparous...

George A. Maynard; Lisa K. Izzo; Zydlewski, Joseph D.

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Year Published: 2019

Individual behaviour and resource use of thermally stressed brook trout Salvelinus fontinalis portend the conservation potential of thermal refugia

Individual aggression and thermal refuge use were monitored in brook trout Salvelinus fontinalis in a controlled laboratory to determine how fish size and personality influence time spent in forage and thermal habitat patches during periods of thermal stress. On average, larger and more exploratory fish initiated more aggressive...

White, Shannon L.; Kline, B.C.; Hitt, Nathaniel; Wagner, Tyler

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Year Published: 2019

Nest structure affects auditory and visual detectability, but not predation risk, in a tropical songbird community

Offspring mortality varies dramatically among species with critical demographic and evolutionary ramifications, yet the causes of this variation remain unclear. Nests are widely used for breeding across taxa and thought to influence offspring mortality risk. Traditionally, more complex, enclosed nest structures are thought to reduce offspring...

Mouton, James C.; Martin, Thomas E.

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Year Published: 2019

Applications of emerging fisheries techniques for paddlefish

No abstract available. 

Gregory Whitledge; Richard Lance; Long, James M.; Ben Neely; Jason Schooley

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Year Published: 2019

Land-use change and the ecological consequences of personality in small mammals

Many plants rely on animals for seed dispersal, but are all individuals equally effective at dispersing seeds? If not, then the loss of certain individual dispersers from populations could have cascade effects on ecosystems. Despite the importance of seed dispersal for forest ecosystems, variation among individual dispersers and whether land‐use...

Brehm, Allison M.; Mortelliti, Alessio; Maynard, George A.; Zydlewski, Joseph D.

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Year Published: 2019

Incorporating citizen science data in spatially explicit integrated population models

Information about population abundance, distribution, and demographic rates is critical for understanding a species’ ecology and for effective conservation and management. To collect data over large spatial and temporal extents for such inferences, especially for species with low densities or wide distributions, citizen science can be an efficient...

Sun, Catherine C.; Royle, Andy; Fuller, Angela K.