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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: 105
Date published: November 9, 2020

Migration Routes 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 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

Filter Total Items: 2,787
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Year Published: 2019

Population trends of king and common eiders from spring migration counts at Point Barrow, Alaska between 1994 and 2016

Most king (Somateria spectabilis) and common eiders (S. mollissima v-nigra) breeding in the northwestern Nearctic migrate past Point Barrow, Alaska. Spring migration counts have been conducted there since 1953; during 1976–1996, both species declined > 50% for unknown reasons. To evaluate population trends, counts in 2003, 2004, 2015...

McGuire, R.; Suydam, R.; Quakenbush, L.; Powell, Abby

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Year Published: 2019

Effects of multiple nonnative fish on an imperiled cyprinid, Hornyhead Chub

Nonnative fish can have substantial negative effects on the abundance and distribution of native fishes through predation and competition. Nonnative predators are of particular interest because they represent novel threats to native prey species that are not adapted to their presence. Prey species with limited distributions or population sizes may...

Hickerson, Brian T.; Maitland, Bryan M.; Walters, Annika W.

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Year Published: 2019

Multivariate models and analyses

No abstract available.

Stuber, Erica; Christopher Chizinski; Lusk, Jeffrey; Fontaine, Joseph J.

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Year Published: 2019

Comparing ecological models

No abstract available.

Hooten, Mevin; Cooch, Evan G.

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Year Published: 2019

Isolation by a hydroelectric dam induces minimal impacts on genetic diversity and population structure in six fish species

Reduced connectivity created by artificial barriers can influence the genetic integrity of isolated subpopulations by reducing local population sizes and altering patterns of gene flow. We investigated the genetic impacts of one such barrier, the Prairie du Sac dam, Wisconsin, USA, using microsatellite data from six fish species with varying life...

Ruzich, Jenna; Turnquist, Keith; Nye, Nathan; Rowe, David; Larson, Wesley

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Year Published: 2019

Effects of the neonicotinoid insecticide clothianidin on southern leopard frog (Rana sphenocephala) tadpole behavior

Neonicotinoid insecticides are highly water soluble with relatively long half-lives, which allows them to move into and persist in aquatic ecosystems. However, little is known of the impacts of neonicotinoids on non-target vertebrates, especially at sublethal concentrations. We evaluated the effects of the neonicotinoid clothianidin on the...

Holtswarth, J. N.; Rowland, F. E.; Puglis, Holly J.; Hladik, Michelle; Webb, Elisabeth B.

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Year Published: 2019

Distribution and status of trout and char in North America

No abstract available.

Budy, Phaedra; Rogers, Kevin B.; Kanno, Yoichiro; Penaluna, Brooke E; Hitt, Nathaniel; Thiede, Gary P.; Dunham, Jason; Mellison, Chad; Somer, William; DeRito, James

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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.