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How our Program Works

We're working on this page! Check back soon — last updated September 15, 2025.

Our mission has three directives: (1) conduct research to deliver actionable science to cooperating agencies and organizations; (2) develop the natural resource conservation workforce of the future through graduate educa­tion; and (3) fulfill the training and technical assistance needs of cooperators. 

Staffing
The recent budget increases allowed the CRU to actively fill positions over the past 2 years, with 37 new scientists brought onboard (26 in FY21 and 11 in FY22). However, 27 vacancies remained at the end of the FY22 owing to the loss of 14 scientists (retirements, resignations, death) over the past 2 years, and the addition of 6 new positions at the new units. Hiring actions have been initiated to fill another nine positions, including Unit Leader positions at the new Nevada, Michigan, and Indiana Units.

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Fishing off rock

Operational Support
The recent budget increases provided needed operational support to the CRUs, with respect to capital investments for items such as vehicles and safety equipment. This significant financial commitment has been lacking in recent years as a result of an extended period of flat funding during government budget sequestration (2013–18) that resulted in little to no financial support for operational investments. Consequently, operational equipment such as the vehicle fleet continued to age without replacement and the vehicles are now approaching the end of their serviceable life. Under the scenario with 30+ vacancies, the units could be operational with the existing vehicle fleet because demand was down. However, with 37 new scientists recently brought into the program and 27 more yet to come, a significant investment is needed in operational items, such as vehicles, watercraft, all-terrain vehicles, utility terrain vehicles, along with laboratory and safety equipment to support the active and growing field research programs of potentially 60+ new scientists.

 

 

Leveraging Resources and Creating Jobs

The CRU program maximizes taxpayer investment, turning every appropriated Federal dollar into three dollars by CRU scientists, who leverage additional funding and support for the CRU program. Leveraged funding is administered through host university’s budgetary processes to support each Unit’s research program, to provide training to students, and to help cooperators and stakeholders. On average, the leveraged funding streams from CRU scientists generate support for as many as 31 non-Federal positions at each host university per year, including graduate students, postdoctoral researchers, and research technicians. Leveraged funding at host universities supports over 1,100 jobs, providing real economic benefits to local communities. Cooperating universities also provided an additional \$22 million of in-kind support through facilities, student tuition, and reduced overhead.

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Goose Lake redband trout

Research Priorities

Following the original legislation that created the CRU program (Public Law 86–686), all research priorities are set locally at each unit in consultation with Federal and State cooperators. Unit scientists and unit supervisors work with cooperators to help them identify their needs, and unit supervi­sors ensure that all research conducted is aligned with the USGS mission. Unit scientists, associated faculty, staff and students regularly conduct research projects in coordination with, and to meet the needs of, USGS headquarters, regions, and science centers. See the Notes from the Field section for examples of collaborative work with science centers, States, non-government organizations (NGOs), and other Federal cooperators. Final approval for each project is made by CRU headquarters management (Chief or Deputy Chief) to ensure that projects meet the USGS mission and the Department of Interior (DOI) priorities.

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Collared mule deer

Project Controls

Research Work Orders (RWOs) are the mechanism through which host universities receive Federal financial support to conduct research, as provided for in the 1978 amendment to Public Law 86–686. RWOs are an extension of the Cooperative Agreement establishing each unit. Funds from the USGS, other DOI bureaus, or other Federal agencies are obligated via financial assistance into a RWO and awarded to the host university for a specific research project.

The Deputy Chief ensures that the project meets the require­ments for a RWO, including the following (1) the project must be novel research; (2) the project must be consistent with the mission of the USGS and DOI priorities; (3) the project must have an educational component; (4) the budget is complete and appropri­ate; and (5) no apparent conflicts of interest exist.

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mallard duck with yellow bill, green head, and grey black feathers, on water

Regional Engagement and Coordination

CRU headquarters staff and leadership work closely with key regional partners, including USGS Center Directors, USGS Regional Directors, USGS Ecosystems Mission Area leadership, as well as leadership from other agencies, such as the USFWS. The Chief of the CRU program works closely with USGS Center Directors and USGS Regional Directors on topics of mutual inter­est. For example, the development of an interagency pollinator science laboratory that engages regional staff, center scientists, and external partners (such as, USFWS, U.S. Department of Agri­culture [USDA], the Northeast Association of Fish and Wildlife Agencies, National Park Service [NPS], and the Smithsonian Institution) in research to inform pollinator conservation activities at State and Federal agencies.

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Image: Transporting a Captured Mule Deer

Success in Applied Research

Scientists, research staff, and students in the CRU program were highly productive, publishing 360 scientific papers in FY 2024 related to partner-identified natural resource problems. These papers were published in over 130 peer-reviewed journals, ranging from international journals, such as “Nature,” to regional journals, such as “Southwestern Naturalist.” Unit scientists published mostly in journals supported by professional societies such as the Wildlife Society and the American Fisheries Society. Unit scientists provide insight and guidance regarding conservation challenges and help inform decision-making by resource managers at State, regional, and national levels. Unit scientists directed over 700 research projects during FY 2024. To address agency needs, cooperators determined topical science themes of FY 2024 research projects, such as Hunting and Fishing Resources, Animal Migration and Movements, Invasive Species and Fish and Wildlife Disease, and Federal, State, and Local Decision-making Strategies

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Graduate students electrofishing on Deer Creek in Nebraska

Staff Profiles

Filter Total Items: 142

Zack Holcomb

David Chip Leslie, Jr., Ph.D. (Former Employee)

John Withers

Science

Filter Total Items: 86

Invasive flathead catfish now top predators in Susquehanna River in Pennsylvania

New study suggests that smallmouth bass and channel catfish are changing what they eat to avoid having to compete with or being eaten by the invader
Invasive flathead catfish now top predators in Susquehanna River in Pennsylvania

Invasive flathead catfish now top predators in Susquehanna River in Pennsylvania

New study suggests that smallmouth bass and channel catfish are changing what they eat to avoid having to compete with or being eaten by the invader
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Population ecology of the invasive American Bullfrog (Rana catesbeiana) in Southeastern Arizona

Native to eastern North America, the American bullfrog (Rana catesbeiana) was introduced to Arizona for sport hunting in the early 1900s and has since come to dominate many aquatic systems and threaten native amphibians through four primary mechanisms.
Population ecology of the invasive American Bullfrog (Rana catesbeiana) in Southeastern Arizona

Population ecology of the invasive American Bullfrog (Rana catesbeiana) in Southeastern Arizona

Native to eastern North America, the American bullfrog (Rana catesbeiana) was introduced to Arizona for sport hunting in the early 1900s and has since come to dominate many aquatic systems and threaten native amphibians through four primary mechanisms.
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Population ecology of the federally threatened narrow-headed gartersnake (Thamnophis rufipunctatus) in Canyon Creek, Arizona

The narrow-headed gartersnake (Thamnophis rufipunctatus) is a federally threatened species endemic to the Mogollon Rim in central Arizona and western New Mexico. This species has declined across its range primarily due to habitat loss, degradation and invasive species . Additional information on this species’ ecology, particularly empirical estimates of movement and demographic parameters, are...
Population ecology of the federally threatened narrow-headed gartersnake (Thamnophis rufipunctatus) in Canyon Creek, Arizona

Population ecology of the federally threatened narrow-headed gartersnake (Thamnophis rufipunctatus) in Canyon Creek, Arizona

The narrow-headed gartersnake (Thamnophis rufipunctatus) is a federally threatened species endemic to the Mogollon Rim in central Arizona and western New Mexico. This species has declined across its range primarily due to habitat loss, degradation and invasive species . Additional information on this species’ ecology, particularly empirical estimates of movement and demographic parameters, are...
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Distribution and population demographics of invasive bigheaded carp in the Lower Red River Basin

Our study objectives were to 1) determine the spatial and temporal distribution and adult population demographics of invasive Silver Carp and Bighead Carp, 2) establish baseline native and invasive fish assemblage and habitat association data, and 3) determine movement patterns of both Silver Carp and Bighead Carp in the Red River using telemetry. We sampled larger-bodied fishes using a...
Distribution and population demographics of invasive bigheaded carp in the Lower Red River Basin

Distribution and population demographics of invasive bigheaded carp in the Lower Red River Basin

Our study objectives were to 1) determine the spatial and temporal distribution and adult population demographics of invasive Silver Carp and Bighead Carp, 2) establish baseline native and invasive fish assemblage and habitat association data, and 3) determine movement patterns of both Silver Carp and Bighead Carp in the Red River using telemetry. We sampled larger-bodied fishes using a...
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USGS Alaska Science Center Wildlife Tracking Data Collection

Understanding the short- and long-distance movements of wildlife is critical for a wide variety of ecological research questions and management decisions. Since the mid-1980s, the USGS Alaska Science Center has used information from telemetry devices on wildlife species to determine locations of animals throughout their annual cycles, understand patterns of habitat use, quantify time spent on...
USGS Alaska Science Center Wildlife Tracking Data Collection

USGS Alaska Science Center Wildlife Tracking Data Collection

Understanding the short- and long-distance movements of wildlife is critical for a wide variety of ecological research questions and management decisions. Since the mid-1980s, the USGS Alaska Science Center has used information from telemetry devices on wildlife species to determine locations of animals throughout their annual cycles, understand patterns of habitat use, quantify time spent on...
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Prairie Streams and Fishes Collaborative

The Prairie Streams and Fishes Collaborative (PSFC) is a geographically diverse group of fisheries professionals who share an interest in prairie streams and associated prairie stream fishes. Fisheries researchers and managers responsible for prairie stream fish conservation recognized the need for multi-State, multi-agency networking. Established in 2020, PSFC is a unique initiative that seeks to...
Prairie Streams and Fishes Collaborative

Prairie Streams and Fishes Collaborative

The Prairie Streams and Fishes Collaborative (PSFC) is a geographically diverse group of fisheries professionals who share an interest in prairie streams and associated prairie stream fishes. Fisheries researchers and managers responsible for prairie stream fish conservation recognized the need for multi-State, multi-agency networking. Established in 2020, PSFC is a unique initiative that seeks to...
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USGS Ecosystems Science Strengthening America's Hunting and Fishing Heritage

USGS science is vital for securing the hunting and fishing traditions many Americans value. By studying wildlife populations, habitats, and health, the USGS provides essential information that helps ensure these outdoor activities can continue to thrive.
USGS Ecosystems Science Strengthening America's Hunting and Fishing Heritage

USGS Ecosystems Science Strengthening America's Hunting and Fishing Heritage

USGS science is vital for securing the hunting and fishing traditions many Americans value. By studying wildlife populations, habitats, and health, the USGS provides essential information that helps ensure these outdoor activities can continue to thrive.
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Artificial Intelligence in the USGS Ecosystems Mission Area

As a data-driven bureau, the USGS Ecosystem Mission Area (EMA) relies on artificial intelligence (AI) to efficiently gather, analyze, and deliver natural resource information to Federal, State, Tribal, academic, and industry partners. USGS EMA scientists are developing and testing innovative uses of AI, including machine learning, deep neural network models, and photogrammetry, to streamline the...
Artificial Intelligence in the USGS Ecosystems Mission Area

Artificial Intelligence in the USGS Ecosystems Mission Area

As a data-driven bureau, the USGS Ecosystem Mission Area (EMA) relies on artificial intelligence (AI) to efficiently gather, analyze, and deliver natural resource information to Federal, State, Tribal, academic, and industry partners. USGS EMA scientists are developing and testing innovative uses of AI, including machine learning, deep neural network models, and photogrammetry, to streamline the...
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Stories from the Field

We value input from members of state fish and wildlife agencies, universities, and our supporters. Following the original legislation that created the CRU Program (Public Law 86–686, 74 Stat. 733), all Unit research priorities are set locally at each Unit in consultation with Federal and State cooperators. Unit scientists and supervisors work with cooperators to help them identify their research...
Stories from the Field

Stories from the Field

We value input from members of state fish and wildlife agencies, universities, and our supporters. Following the original legislation that created the CRU Program (Public Law 86–686, 74 Stat. 733), all Unit research priorities are set locally at each Unit in consultation with Federal and State cooperators. Unit scientists and supervisors work with cooperators to help them identify their research...
Learn More

Corridor Mapping Team: Ungulate Migrations of the West

Advancing the conservation and understanding of Wyoming's migratory hooved animals (mule deer, elk, pronghorn, etc.). The Wyoming Cooperative Fish and Wildlife Research Unit is led by USGS federal researchers. The Wyoming Migration Initiative is a University of Wyoming’s Zoology and Physiology Department-based collaborative of biologists, photographers, mapmakers, and writers working to research...
Corridor Mapping Team: Ungulate Migrations of the West

Corridor Mapping Team: Ungulate Migrations of the West

Advancing the conservation and understanding of Wyoming's migratory hooved animals (mule deer, elk, pronghorn, etc.). The Wyoming Cooperative Fish and Wildlife Research Unit is led by USGS federal researchers. The Wyoming Migration Initiative is a University of Wyoming’s Zoology and Physiology Department-based collaborative of biologists, photographers, mapmakers, and writers working to research...
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Wildfire Impacts and Restoration

Fire management professionals balance the need to control wildfires to protect lives and property, while also starting prescribed fires to maintain fire-dependent ecosystems and to reduce the size of, and occurrence of, wildfires. Yet, despite good intentions and billions of dollars invested, large wildfires are becoming common. Current fire management techniques are no match for the challenges...
Wildfire Impacts and Restoration

Wildfire Impacts and Restoration

Fire management professionals balance the need to control wildfires to protect lives and property, while also starting prescribed fires to maintain fire-dependent ecosystems and to reduce the size of, and occurrence of, wildfires. Yet, despite good intentions and billions of dollars invested, large wildfires are becoming common. Current fire management techniques are no match for the challenges...
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Species We Study: Pollinators

Ecosystems—whether agricultural, urban, or natural—depend on pollinators, great and small. Pollinators in the form of bees, birds, butterflies, bats, and even moths provide vital, but often invisible services, from contributing to biodiverse terrestrial wildlife and plant communities to supporting healthy watersheds. Pollinator declines worldwide have been noted as land-use and climate changes...
Species We Study: Pollinators

Species We Study: Pollinators

Ecosystems—whether agricultural, urban, or natural—depend on pollinators, great and small. Pollinators in the form of bees, birds, butterflies, bats, and even moths provide vital, but often invisible services, from contributing to biodiverse terrestrial wildlife and plant communities to supporting healthy watersheds. Pollinator declines worldwide have been noted as land-use and climate changes...
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Powering Progress: How Science Can Fuel the Energy Resources Life Cycle

Energy is essential to modern life, and accessing it involves a complex lifecycle, from resource discovery to extraction, use, and eventual remediation and reclamation. The USGS Ecosystems Mission Area supports this process by conducting research and providing scientific insights to guide decision-making at each stage. By collaborating with resource management agencies and stakeholders, we analyze...
Powering Progress: How Science Can Fuel the Energy Resources Life Cycle

Powering Progress: How Science Can Fuel the Energy Resources Life Cycle

Energy is essential to modern life, and accessing it involves a complex lifecycle, from resource discovery to extraction, use, and eventual remediation and reclamation. The USGS Ecosystems Mission Area supports this process by conducting research and providing scientific insights to guide decision-making at each stage. By collaborating with resource management agencies and stakeholders, we analyze...
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Fishing and Hunting

This page is a work in progress and showcases fishing and hunting as a way of life, a food source, and recreational opportunity for millions of Americans. The management of fish and wildlife populations for the benefit of current and future generations is the foundation of our Nation’s conservation heritage. We help to inform decisions through a variety of actions, from the development and...
Fishing and Hunting

Fishing and Hunting

This page is a work in progress and showcases fishing and hunting as a way of life, a food source, and recreational opportunity for millions of Americans. The management of fish and wildlife populations for the benefit of current and future generations is the foundation of our Nation’s conservation heritage. We help to inform decisions through a variety of actions, from the development and...
Learn More

The Grouse and Grazing Project: Effects of cattle grazing on demographic traits of greater sage-grouse

Greater sage-grouse (Centrocercus urophasianus) were once widespread within sagebrush -grassland ecosystems of western North America, but populations have declined since the mid-1960s. Though sage-grouse were not listed as threatened or endangered under the Endangered Species Act (ESA), when examined in 2015, they remain a species of interest and concern. Roughly half of the sage-grouse’s...
The Grouse and Grazing Project: Effects of cattle grazing on demographic traits of greater sage-grouse

The Grouse and Grazing Project: Effects of cattle grazing on demographic traits of greater sage-grouse

Greater sage-grouse (Centrocercus urophasianus) were once widespread within sagebrush -grassland ecosystems of western North America, but populations have declined since the mid-1960s. Though sage-grouse were not listed as threatened or endangered under the Endangered Species Act (ESA), when examined in 2015, they remain a species of interest and concern. Roughly half of the sage-grouse’s...
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O Romeo! Environmental DNA could prevent a tragedy for the elusive Chucky Madtom

Using environmental DNA (eDNA) surveillance methods, we report the first evidence of the persistence of the Chucky Madtom (Noturus crypticus) in Little Chucky Creek, Tennessee, which has been absent from conventional surveys since 2004, and in Dunn Creek, Tennessee, where it was last collected in 1940.
O Romeo! Environmental DNA could prevent a tragedy for the elusive Chucky Madtom

O Romeo! Environmental DNA could prevent a tragedy for the elusive Chucky Madtom

Using environmental DNA (eDNA) surveillance methods, we report the first evidence of the persistence of the Chucky Madtom (Noturus crypticus) in Little Chucky Creek, Tennessee, which has been absent from conventional surveys since 2004, and in Dunn Creek, Tennessee, where it was last collected in 1940.
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Quality Assessment of Past Spawning Mark Estimations from a Long-Term Survey in the Connecticut River Watershed

For this report, we assessed the bias and precision of paired reader estimations of spawning marks on scales of Blueback herring (Alosa aestivalis) collected in the U.S. Fish & Wildlife (USFWS) Annual Adult River Herring Stock Assessment for the lower Connecticut River basin.
Quality Assessment of Past Spawning Mark Estimations from a Long-Term Survey in the Connecticut River Watershed

Quality Assessment of Past Spawning Mark Estimations from a Long-Term Survey in the Connecticut River Watershed

For this report, we assessed the bias and precision of paired reader estimations of spawning marks on scales of Blueback herring (Alosa aestivalis) collected in the U.S. Fish & Wildlife (USFWS) Annual Adult River Herring Stock Assessment for the lower Connecticut River basin.
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USGS Ecosystems Science for Food and Water Security

USGS science developed by the Ecosystems Mission Area helps ensure safe and abundant domestic food and water supplies, ensuring all Americans access to livelihoods and traditions that connect generations with each other and the outdoors and strengthen America’s self-reliance. USGS science is used by decision makers at all levels to understand how the quality of America’s food supply is directly...
USGS Ecosystems Science for Food and Water Security

USGS Ecosystems Science for Food and Water Security

USGS science developed by the Ecosystems Mission Area helps ensure safe and abundant domestic food and water supplies, ensuring all Americans access to livelihoods and traditions that connect generations with each other and the outdoors and strengthen America’s self-reliance. USGS science is used by decision makers at all levels to understand how the quality of America’s food supply is directly...
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USGS Ecosystems Science in Support of Economic Growth

Science provided by the USGS Ecosystems Mission Area helps boost America’s economy by providing practical tools to implement cost-effective management and development strategies that supports the Nation’s economic growth and protects our natural heritage.
USGS Ecosystems Science in Support of Economic Growth

USGS Ecosystems Science in Support of Economic Growth

Science provided by the USGS Ecosystems Mission Area helps boost America’s economy by providing practical tools to implement cost-effective management and development strategies that supports the Nation’s economic growth and protects our natural heritage.
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Maintaining Frog Monitoring and Population on the Las Cienegas National Conservation Area

This report summarizes and analyzes the data collected on the Chiricahua Leopard Frog (CLF) populations on the Las Ciénegas National Conservation Area (LCNCA) in southeast Arizona, U.S.A., during the reporting period covered under this funding agreement from September 2020 through October 2024 and place this analysis in historical context of the previous monitoring efforts.
Maintaining Frog Monitoring and Population on the Las Cienegas National Conservation Area

Maintaining Frog Monitoring and Population on the Las Cienegas National Conservation Area

This report summarizes and analyzes the data collected on the Chiricahua Leopard Frog (CLF) populations on the Las Ciénegas National Conservation Area (LCNCA) in southeast Arizona, U.S.A., during the reporting period covered under this funding agreement from September 2020 through October 2024 and place this analysis in historical context of the previous monitoring efforts.
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