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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: 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: 2,756
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Year Published: 2019

First summer survival and channel unit habitat use by the Neosho subspecies of Smallmouth Bass (Micropterus dolomieu velox)

No abstract available. 

Brewer, Shannon K.; Browne, Brandon L.; Thomas A. Worthington; Mollenhauer, Robert; Rodger, Anthony; Skoog, Matt; Burroughs, Jim

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Year Published: 2019

The application of oyster reefs in shoreline protection: Are we over‐engineering for an ecosystem engineer?

Oyster reef living shorelines have been proposed as an effective alternative to traditional coastal defence structures (e.g. bulkheads, breakwaters), with the benefit that they may keep pace with sea‐level rise and provide co‐benefits, such as habitat provision. However, there remains uncertainty about the effectiveness of shoreline protection...

Morris, R.L.; Bilkovic, D.M.; Boswell, M.K.; Bushek, D.; Cebrian, J.; Goff, J.; Kibler, K.M.; LaPeyre, Megan K.; McClenachan, G.; Moody, J.A.; Sacks, P.E.; Shinn, J.P.; Sparks, E.L.; Temple, N.A.; Walters, L.J.; Swearer, S.E.; Webb, B.M.

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Year Published: 2019

Flow alteration-ecology relationships in Ozark Highland streams: Consequences for fish, crayfish and macroinvertebrate assemblages

We examined flow alteration-ecology relationships in benthic macroinvertebrate, fish, and crayfish assemblages in Ozark Highland streams, USA, over two years with contrasting environmental conditions, a drought year (2012) and a flood year (2013). We hypothesized that: 1) there would be temporal variation in flow alteration-ecology...

Lynch, D.T.; Leasure, D.R.; Magoulick, Daniel D.

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Year Published: 2019

Relatedness within and among Myotis septentrionalis colonies at a local scale

Abstract: We assessed parentage within and among maternity colonies of the northern long-eared bat (Myotis septentrionalis Troessart 1897) in north-central Kentucky from 2011–2013 to better understand colony social structure, formation, and membership dynamics. We intensively sampled colonies in close and remote (> 10 km) spatial proximity...

Ford, W. Mark; Miluska Olivera-Hyde; Alexander Silvis; Eric M. Hallerman; Eric R. Britzke

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Year Published: 2019

Growth disparity in sympatric kokanee breeding groups

Growth is arguably the most important dynamic rate function due to its interaction with survival and recruitment. As such, understanding the mechanisms underlying growth is a primary focus of fisheries research. Kokanee Oncorhynchus nerka in Lake Pend Oreille, Idaho, provide an interesting case study for investigating the factors that...

Klein, Zachary B.; Quist, Michael C.; Dux, Andrew M.; Corsi, Matthew P.

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Year Published: 2019

Field-level characteristics influence wild bee functional guilds on public lands managed for conservation

Throughout the Midwestern US, many public lands set aside for conservation engage in management activities (e.g., agriculture) that may act as stressors on wild bee populations. Several studies have investigated how wild bees respond to large-scale agriculture production; however, there has been limited assessment of how wild bees may be...

Main, A.R.; Webb, Elisabeth B.; Goyne, K.W.; Mengel, D.

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Year Published: 2019

Comparison of aquatic invertebrate communities in near-shore areas with high or low boating activity

Lakeshore areas provide important habitat for aquatic invertebrates in shallow lakes. However, these zones are prone to anthropogenic disturbances that include shoreline development, urbanization, nutrient inputs, agricultural and(or) recreational use. Among recreational uses, public access sites are often developed to accommodate boaters and...

Smith, Bradley; Chipps, Steven R.; Grote, Jeff; Mecham, Jake; Stevens, Tanner M.; Rapp, Tobias

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Year Published: 2019

Accounting for phenology in the analysis of animal movement

The analysis of animal tracking data provides important scientific understanding and discovery in ecology. Observations of animal trajectories using telemetry devices provide researchers with information about the way animals interact with their environment and each other. For many species, specific geographical features in the landscape can have...

Scharf, Henry R. ; Hooten, Mevin; Wilson, Ryan R. ; Durner, George M.; Atwood, Todd C.

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Year Published: 2019

Evidence of age-related improvement in the foraging efficiency of Adélie penguins

Age variation in reproductive performance is well-documented but the mechanisms underlying this variation remain unclear. Foraging efficiency is likely to be a key source of demographic variation as it determines the amount of energy that can be invested in fitness-related activities. Evidence of age-related changes in the foraging efficiency of...

Lescroël, Amélie; Ballard, Grant; Massaro, Melanie; Dugger, Catherine M.; Jennings, Scott; Pollard, Annie M.; Porzig, Elizabeth L.; Schmidt, Annie; Varsani, Arvind; Grémillet, David; Ainley, David G.

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Year Published: 2019

A hierarchical Bayesian approach for handling missing classification data

Ecologists use classifications of individuals in categories to understand composition of populations and communities. These categories might be defined by demographics, functional traits, or species. Assignment of categories is often imperfect, but frequently treated as observations without error. When individuals are observed but not classified,...

Alison C. Ketz; Therese L. Johnson; Hooten, Mevin; N. Thompson Hobbs

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Year Published: 2019

Cooperative Fish and Wildlife Research Units program—2018 year in review

The Cooperative Fish and Wildlife Research Units (CRU) program had an interesting and challenging year in 2018. We made significant strategic advances on many fronts and had setbacks in others.Our relationship with the U.S. Fish and Wildlife Service, the agency we belonged to from 1935 to the mid-1990s, was further reinforced through strategic...

Organ, John F.; Thompson, John D.; Childs, Dawn E.; Dennerline, Donald E.
Organ, J.F., Thompson, J.D., Childs, D.E., and Dennerline, D.E., 2019, Cooperative Fish and Wildlife Research Units program—2018 year in review (ver. 1.1, March 29, 2019): U.S. Geological Survey Circular 1452, 52 p., https://doi.org/10.3133/cir1452.

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Year Published: 2019

Cooperative Fish and Wildlife Research Units program—2018 year in review postcard

This postcard provides details about the "Cooperative Fish and Wildlife Research Units Program—2018 Year in Review," U.S. Geological Survey Circular 1452, now available at https://doi.org/10.3133/cir1452. In this report, you will find details about the Cooperative Fish and Wildlife Research Units (CRU) program relating to its background, fish and...

Organ, John F.; Thompson, John D.; Childs, Dawn; Dennerline, Donald E.
Organ, J.F., Thompson, J.D., Childs, D.E., and Dennerline, D.E., 2019, Cooperative Fish and Wildlife Research Units program—2018 year in review postcard: U.S. Geological Survey General Information Product 187, 2 p., https://doi.org/10.3133/gip187.