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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 Elk in Fossil Buttes Population in Wyoming

The Fossil Butte (hereafter referred to as the Monument in this section of the report) elk population winters in the southern Wyoming Range between Fossil Butte National Monument and Cokeville (fig. 45). During spring, they migrate north short (11 mi [18 km]) to medium (74 mi [119 km]) distances. The segment of the elk population that winters near the Monument migrates i

Date published: November 9, 2020

Annual Ranges 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 Routes of Elk in the Piney Herd in Wyoming

Migratory movements of elk within the Piney herd unit, a large area encompassing the eastern side of the Wyoming, include short (i.e., 10 miles) to medium (i.e., 30 miles) distance migrations. These elk migrate from low elevation elk feedgrounds and native winter ranges in the Upper Green River Basin to high elevation summer ranges in the Wyoming Range. In summer, some elk head

Date published: November 9, 2020

Migration stopovers of mule deer in the Sheep Creek Range, Nevada

Mule deer in the Sheep Creek sub herd are part of the larger Area 6 herd that occupies portions of Elko, Lander, and Eureka counties. The primary winter range of this population is located along the eastern flank of the Sheep Creek Range and the west side of Boulder Valley. Most deer migrate approximately 30 miles from winter ranges in upper Boulder Creek and Antelope Creek drainages to summe...

Date published: November 9, 2020

Migration corridors of mule deer in the Izzenhood herd, Nevada

Mule deer in the Izzenhood herd are part of a larger population known in Nevada as the “Area 6” mule deer population. They primarily reside on winter ranges in the Izzenhood Basin and upper Rock Creek drainages in western Elko County and northern Lander County. From their winter range, mule deer in this sub population migrate approximately 70 miles to summer ranges in the north

Date published: November 9, 2020

Migration Routes of Mule Deer in the Owl Creek/Meeteetse Herd in Wyoming

Mule deer within the Owl Creek/Meeteetse herd make a number of medium- to long-distance migrations west into the Shoshone National Forest. These migrations originate on the sagebrush grasslands just southwest and west of Meeteetse, Wyoming, where this population winters. In spring, an estimated 4,100 deer leave these foothills and travel into the rugged Absaroka mountain range. These jo

Date published: November 9, 2020

Migration stopovers of mule deer in the Ruby Mountains, Nevada

The Area 10 mule deer population is one of the largest deer herds in the state, accounting for roughly 20 percent of the statewide mule deer population. The Area 10 herd is comprised of several sub populations that occupy the majority of the Ruby Mountains, are highly migratory,and exhibit long distance migrations from summer to winter ranges. Several key stopovers occur within the migratio...

Date published: November 9, 2020

Migration Routes of Mule Deer in the Mesa Population in Wyoming

The Mesa mule deer population is part of the larger Sublette herd that winters in the north-central portion of the Green River Basin, east of the Green River and west of U.S. Highway 191 (fig. 32). The Mesa wintering area supports 3,000 to 5,000 deer that migrate northwest to summer ranges in the Wyoming Range, Gros Ventre Range, and Salt River Range. The Mesa winter range, which

Date published: November 9, 2020

Migration routes 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

Winter ranges of mule deer in the Izzenhood herd, Nevada

Mule deer in the Izzenhood herd are part of a larger population known in Nevada as the “Area 6” mule deer population. They primarily reside on winter ranges in the Izzenhood Basin and upper Rock Creek drainages in western Elko County and northern Lander County. From their winter range, mule deer in this sub population migrate approximately 70 miles to summer ranges in the north

Date published: November 9, 2020

Migration Corridors of Mule Deer in the Paunsaugunt Plateau Herd in Utah

The Paunsaugunt Plateau in southern Utah is home to a prolific mule deer herd numbering around 5,200 individuals in 2019. In early October, these mule deer begin their migration from the Plateau traveling south distances up to 78 miles to winter range in the Buckskin Mountains near the Utah-Arizona border. Approximately 20-30% of the Paunsaugunt Plateau herd reside in northern Arizona durin...

Date published: November 9, 2020

Winter Ranges of Mule Deer in the Paunsaugunt Plateau Herd in Utah

The Paunsaugunt Plateau in southern Utah is home to a prolific mule deer herd numbering around 5,200 individuals in 2019. In early October, these mule deer begin their migration from the Plateau traveling south distances up to 78 miles to winter range in the Buckskin Mountains near the Utah-Arizona border. Approximately 20-30% of the Paunsaugunt Plateau herd reside in northern Arizona durin...

Filter Total Items: 2,893
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Year Published: 2020

Minnesota landowners’ trust in their department of natural resources, salient values similarity and wildlife value orientations

Due to extensive land conversion over the last century, much of the native prairie pothole ecosystem has been converted to agricultural or other human uses. The prairie pothole ecosystem is found in the northern plains of Iowa, Minnesota, South Dakota, North Dakota, and Montana. Because most of the land in this region is privately owned and used...

Gigliotti, Larry M.; Sweikert, Lily A.; Cornicelli, Louis; Fulton, David C.

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Year Published: 2020

Trends in cheetah Acinonyx jubatus density in north-central Namibia

Assessing trends in abundance and density of species of conservation concern is vital to inform conservation and management strategies. The remaining population of the cheetah (Acinonyx jubatus) largely exists outside of protected areas, where they are often in conflict with humans. Despite this, the population status and dynamics of cheetah...

Fabiano, Ezequiel Chimbioputo; Sutherland, Chris; Fuller, Angela K.; Nghikembua, Matti; Eizirik, Eduardo; Marker, Laurie

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Year Published: 2020

Tissue distribution and immunomodulation in channel catfish (Ictalurus punctatus) following dietary exposure to polychlorinated biphenyl Aroclors and food deprivation

Although most countries banned manufacturing of polychlorinated biphenyls (PCBs) over 40 years ago, PCBs remain a global concern for wildlife and human health due to high bioaccumulation and biopersistance. PCB uptake mechanisms have been well studied in many taxa; however, less is known about depuration rates and how post-exposure diet can...

White, Sahnnon L; DeMario, Devin A; Iwanowicz, Luke R.; Blazer, Vicki S.; Wagner, Tyler

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Year Published: 2020

Cooperative Fish and Wildlife Research Units program—2019 year in review

Acting Chief’s MessageDear Cooperators:Members of the Cooperative Research Units are pleased to provide you with the “2019 Year in Review” report for the Cooperative Fish and Wildlife Research Units (CRUs). You will first note that this report looks a little different than those published in the past few years, as we opted for a shorter, more...

Thompson, John D.; Dennerline, Donald E.; Childs, Dawn E.
Thompson, J.D., Dennerline, D.E., and Childs, D.E., 2020, Cooperative Fish and Wildlife Research Units program—2019 year in review: U.S. Geological Survey Circular 1463, 22 p., https://doi.org/10.3133/cir1463.

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Year Published: 2020

Cooperative Fish and Wildlife Research Units program—2019 year in review postcard

Acting Chief’s MessageDear friends,I invite you to take a look at U.S. Geological Survey Circular 1463, “Cooperative Fish and Wildlife Research Units Program—2019 Year in Review,” now available at https://doi.org/10.3133/cir1463. In this report, you will find details about the Cooperative Fish and Wildlife Research Units (CRU) program concerning...

Thompson, John D.; Dennerline, Donald E.; Childs, Dawn E.
Thompson, J.D., Dennerline, D.E., and Childs, D.E., 2020, Cooperative Fish and Wildlife Research Units program—2019 year in review postcard: U.S. Geological Survey General Information Product 195, 2 p., https://doi.org/10.3133/gip195.

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Year Published: 2020

Quantifying harvestable fish and crustacean production and associated economic values provided by oyster reefs

Quantifying ecosystem services can provide information to justify conservation and restoration decisions so as to allocate limited resources effectively. Consequently, decision makers and public typically ask for simple and understandable information with confidence regarding the availability of the services and the probable economic value. Here,...

Lai, QT; Irwin, Elise R.; Zhang, Yawen

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Year Published: 2020

Effects of temperature on hatching rate and early development of alligator gar and spotted gar in a laboratory setting

Water temperature influences both morphological and physiological development in fishes. However, the effects of water temperature on the early development of Alligator Gar Atractosteus spatula and Spotted Gar Lepisosteus oculatus are not well understood. Both gar species were collected from natural environments and spawned in...

Long, James M.; Snow, R.A.; Porta, M.J.

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Year Published: 2020

Non-crop habitat use by wild bees (Hymenoptera: Apoidea) in a mixed-use agricultural landscape

Homogeneous, agriculturally intense landscapes have abundant records of pollinator community research, though similar studies in the forest-dominated, heterogeneous mixed-use landscape that dominates the northeastern United States are sparse. Trends of landscape effects on wild bees are consistent across homogeneous agricultural landscapes,...

Du Clos, Brianne; Loftin, Cyndy; Drummond, Francis A.

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Year Published: 2020

Combining fisheries surveys to inform marine species distribution modelling

Ecosystem-scale examination of fish communities typically involves creating spatio-temporally explicit relative abundance distribution maps using data from multiple fishery-independent surveys. However, sampling performance varies by vessel and sampling gear, which may influence estimated species distribution patterns. Using GAMMs, the effect of...

Moriarty, Meadhbh; Pedreschi, Debbi; Smeltz, T. Scott; Sethi, Suresh; Harris, Bradley P.; McGonigle, Chris; Wolf, Nathan; Greenstreet, Simon P.R.

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Year Published: 2020

Longitudinal distribution of uncommon fishes in a species-rich basin

The spatial organization of fishes in a river system was investigated to evaluate the longitudinal distribution of uncommon species. It was anticipated that overall richness of the fish community would increase in a downstream direction together with habitat extent, but that more uncommon species would occur upstream owing to greater heterogeneity...

Miranda, Leandro E.; Killgore, K.J.

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Year Published: 2020

Biotic interactions help explain variation in elevational range limits of birds among Bornean mountains

AimPhysiological tolerances and biotic interactions along habitat gradients are thought to influence species occurrence. Distributional differences caused by such forces are particularly noticeable on tropical mountains, where high species turnover along elevational gradients occurs over relatively short distances and elevational distributions of...

Burner, Ryan C.; Boyce, Andy J.; Bernasconi, David; Styring, Alison R.; Shakya, Subir B.; Boer, Chandradewana; Rahman, Mustafa Abdul; Martin, Thomas E.; Sheldon, Frederick H.

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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

Under the guidelines of the Cooperative Research Agreement, CRU is required to communicate with funders, cooperators, stakeholders, and the public. CRU maintains outreach pathways and participation among state, federal, university, and private researchers.

Filter Total Items: 44
Golden Eagle
December 31, 2016

Golden eagle fitted with Global Positioning System (GPS) backpack

Reports of golden eagle mortality linked to wind energy facilities are cause for concern especially when coupled with the knowledge that golden eagles move great distances between breeding and wintering areas. Mortalities at a particular wind energy facility can consequently affect breeding populations of golden eagles at local and continent-wide scales. Information is

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WorldCat holdings, OCLC, USGS Pubs Warehouse, Public Domain, Biodiversity Heritage Library
December 6, 2016

A student volunteer scans historic USGS library material

Student volunteers are trained to scan historic library materials. The materials can be complex, consisting of multiple parts.

Riparian system within the rugged desert landscape.
March 15, 2016

Riparian system within the rugged desert landscape.

An example of a riparian system within the rugged desert landscape. Zone-tailed Hawks nested in the trees in the bottom of the canyon. 

  1. Raptors in the Trans Pecos, Texas Cooperative Fish and Wildlife Research Unit: State-Threatened, Riparian-Obligate Raptors in the Trans Pecos:  Desert riparian systems are distinct narrow drainages that provide environmental
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USGS Museum, historic preservation
December 31, 2015

In the Driver’s Seat

Student dusts the Model A Ford coupe used by USGS scientists from the 1930s to 1965. 

Smithsonian’s Natural History Museum
December 31, 2015

USGS Volunteer Student at the Smithsonian Natural History Museum

The Smithsonian Natural History Museum offers hands-on learning experiences.

Pallid sturgeon
December 31, 2015

Pallid Sturgeon

The pallid sturgeon is an endangered riverine sturgeon with historical distribution restricted to parts of the Yellowstone, Missouri, Mississippi, and Atchafalaya Rivers. Although rare, pallid sturgeon in the lower Mississippi River appear to be naturally recruiting, and information about habitat use is important to conserve this species. This study seeks to provide

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Assessment of the Invasion of the Asian Swamp Eels
August 1, 2015

Assessment of the Invasion of the Asian Swamp Eel

The Asian swamp eel is an invasive species that was introduced into the Chattahoochee River National Recreation Area and has persisted for more than 20 years. The Chattahoochee River National Recreation Area manages, protects, and interprets the biota and landscape of the Chattahoochee River corridor, and the Asian swamp eel is an invasive species that threatens the

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 Passage of adult Atlantic salmon in the Penobscot River, Maine
June 3, 2006

Passage of adult Atlantic salmon in the Penobscot River, Maine

Atlantic salmon runs in the Penobscot and Kennebec Rivers of Maine are federally endangered and remain low. Inefficient fishways at dams continue to slow and prevent upstream migrations to spawning habitat, and delays of weeks to months are common. These delays expose fish to elevated water temperatures, resulting in increased metabolic demands. These energetic costs have

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