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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: 33
Date published: January 1, 2018

Activity patterns of cave-dwelling bat species during pre-hibernation swarming and post-hibernation emergence in the central Appalachians

Bat activity around known hibernacula in Virginia and West Virginia portion of the central Appalachians during the fall swarm and spring emergence, 2015-2017

Date published: February 15, 2017

Standard Methods for Sampling North American Freshwater Fishes

The Arizona Cooperative Fish and Wildlife Research Unit developed a simple, web-based tool to compare freshwater fish data collected using American Fisheries Society standard methods. With widespread use, the tool could become an important resource for fisheries biologists. Check out the video by Scott Bonar, Unit Leader, Arizona Unit...

Date published: January 1, 2017

Proximate Density Composition of Brown Pelican prey in the northern Gulf of Mexico (2014-2015)

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Date published: January 1, 2017

Taxonomical identification of Brown Pelican prey in the northern Gulf of Mexico (2013-2015)

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Date published: January 1, 2017

Composition of diet of juvenile Brown Pelican in the northern Gulf of Mexico (2013-2015)

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Date published: January 1, 2017

Shapefiles and Historical Aerial Photographs, Little Missouri River, 1939-2003

The data archive contains the aerial photographs and channel delineations used in our analysis. The images have been geo-referenced to the 1995 digital orthophoto quarter quadrangles as described by Miller and Friedman (2009). The separate images for each year can be viewed as a composite along with that year’s channel delineation using a geographic information system (GIS). The 2

Date published: January 1, 2017

Productivity of Brown Pelican in the northern Gulf of Mexico (2014-2015)

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Date published: January 1, 2017

Provisioning rate of Brown Pelican in the northern Gulf of Mexico (2014-2015)

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Date published: January 1, 2017

Brown pelican foraging ecology in the northern Gulf of Mexico (2013-2015)_Colony reference

The Brown Pelican (Pelecanus occidentalis) is a large-bodied seabird that nests in colonies of 10 to upwards of 5,000 pairs, on nearshore barrier islands in subtropical and tropical North American waters. It breeds between March and August, laying 2–3 eggs and raising 1–2 chicks per year. The species is facultatively migratory during nonbreeding, with some individuals

Filter Total Items: 2,660
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Year Published: 2019

Foraging ecology mediates response to ecological mismatch during migratory stopover

Impacts of ecological mismatches should be most pronounced at points of the annual cycle when populations depend on a predictable, abundant, and aggregated food resource that changes in timing or distribution. The degree to which species specialize on a key prey item, therefore, should determine their sensitivity to mismatches. We evaluated the...

Tucker, A. M.; McGowan, Conor P.; Catalano, M.; Derose-Wilson, A.; Robinson, R. A.; Zimmerman, J.

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Year Published: 2019

International Organizations and Programs for Wildlife Conservation

Historically, private non-governmental entities in the developed world took interest in wildlife in developing nations. Nineteenth and early twentieth century explorers of Africa, Asia, and South America reported fascinating encounters with magnificent species that were previously cryptic or unknown (Robinson et al. 2017). Organizations such as...

Organ, John F.; Medina-Vogel, Gonzalo; Yoshida, T.

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Year Published: 2019

Energy intake rate influences survival of Black Oystercatcher Haematopus bachmani broods

Black Oystercatchers Haematopus bachmani, a species of conservation concern, depend on marine intertidal prey resources. We examined diet, feeding rates, growth, and survival of Black Oystercatcher broods in southcentral Alaska, 2013-2014. To determine the importance of diet on brood survival, we modeled daily survival rates of broods as a...

Robinson, B.H.; Phillips, L.M.; Powell, Abby

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Year Published: 2019

Survival and movements of head‐started Mojave desert tortoises

Head‐starting is a conservation strategy in which young animals are protected in captivity temporarily before their release into the wild at a larger size, when their survival is presumably increased. The Mojave desert tortoise (Gopherus agassizii) is in decline, and head‐starting has been identified as one of several conservation measures to...

Daly, J. A.; Buhlmann, K. A.; Todd, B. D.; Moore, Clinton T.; Peaden, J. M.; Tuberville, T. D.

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Year Published: 2019

A collaborative approach to bridging the gap between wildlife managers and researchers

Although most wildlife professionals agree that science should inform wildlife management decisions, disconnect still exists between researchers and managers. If researchers are not striving to incorporate their findings into management decisions, support for research programs by managers can wane. If managers are not using research findings to...

Merkle, Jerod A.; Anderson, Neil J.; Baxley, Danna L.; Chopp, Matthew; Gigliotti, Laura C.; Gude, Justin A.; Harms, Tyler M.; Johnson, Heather E.; Merrill, Evelyn H.; Mitchell, Michael S.; Mong, Tony W.; Nelson, Jerry; Norton, Andrew S.; Sheriff, Michael J.; Tomasik, Eric; VanBeek, Kelly R.

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Year Published: 2019

Survival and recruitment dynamics of Black-legged Kittiwakes Rissa tridactyla at an Alaskan colony

The majority of seabirds breed colonially and exhibit considerable site fidelity over the course of their long lifespans. Initial colony selection can therefore have substantial fitness consequences; however, factors contributing to recruitment into colonies and subsequent fidelity remain unclear. We used multi-state capture-recapture models to...

Loftin, Cyndy; McKnight, Aly; Blomberg, Erik J.; Irons, David B.; McKinney, Shawn T.

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Year Published: 2019

Captive-rearing duration may be more important than environmental enrichment for enhancing turtle head-starting success

Raising captive animals past critical mortality stages for eventual release (head-starting) is a common conservation tactic. Counterintuitively, post-release survival can be low. Post-release behavior affecting survival could be influenced by captive-rearing duration and housing conditions. Practitioners have adopted environmental enrichment to...

Tetzlaff, S.J.; Sperry, J.S.; Kingsbury, B.A.; Degregorio, Brett Alexander

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Year Published: 2019

Conservation easements and coastal armoring: Protecting sea turtle nesting habitat through property ownership

To determine the relationship between the intent of owners of homes located near sea turtle nesting beaches in the state of Florida to engage in coastal conservation easements (CCE), the theory of planned behavior (TPB), environmental identity (EI) and relevant demographics were analyzed. As CCEs are a novel application of a proven conservation...

Hill, M.K.; Monroe, M.C.; Carthy, Raymond; Ankersen, T.T.; Kay, T.A.

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Year Published: 2019

Using a mechanistic model to develop management strategies to cool Apache Trout streams under the threat of climate change

User‐friendly stream temperature models populated with on‐site data may help in developing strategies to manage temperatures of individual stream reaches that are subject to climate change. We used the field‐tested Stream Segment Temperature model (U.S. Geological Survey) to simulate how altering discharge, groundwater input, channel wetted width...

Baker, Joy Price; Bonar, Scott A.

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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.

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: 28
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.

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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