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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

Brent Sigafus

Science

Filter Total Items: 86

Deep Dive: Sustaining the Rich Economic and Recreational Benefits of the Prairie Pothole Region

The wetlands of the Prairie Pothole Region provide essential benefits to communities and are a premier waterfowl breeding ground. Explore how CASC science is informing the strategic restoration and management of the Prairie Pothole Region in the face of climate change.
Deep Dive: Sustaining the Rich Economic and Recreational Benefits of the Prairie Pothole Region

Deep Dive: Sustaining the Rich Economic and Recreational Benefits of the Prairie Pothole Region

The wetlands of the Prairie Pothole Region provide essential benefits to communities and are a premier waterfowl breeding ground. Explore how CASC science is informing the strategic restoration and management of the Prairie Pothole Region in the face of climate change.
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A comprehensive freshwater mussel database for the Duck River Drainage, Tennessee

We have developed a comprehensive database for freshwater mussels for the Duck River drainage in Tennessee, including its largest tributary, the Buffalo River. This database is intended to serve as an expandable template that could be applied statewide. The Duck River is one of the most biologically diverse rivers in the world, with historically over 70 mussel species, and it has been selected as...
A comprehensive freshwater mussel database for the Duck River Drainage, Tennessee

A comprehensive freshwater mussel database for the Duck River Drainage, Tennessee

We have developed a comprehensive database for freshwater mussels for the Duck River drainage in Tennessee, including its largest tributary, the Buffalo River. This database is intended to serve as an expandable template that could be applied statewide. The Duck River is one of the most biologically diverse rivers in the world, with historically over 70 mussel species, and it has been selected as...
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USGS Ecosystems Science in Support of Public Safety & Security

Science within the USGS Ecosystems Mission Area provides a critical advantage in addressing public safety, infrastructure, and security issues surrounding natural disasters and changing landscapes, strengthening America’s ability to be a hazard ready Nation.
USGS Ecosystems Science in Support of Public Safety & Security

USGS Ecosystems Science in Support of Public Safety & Security

Science within the USGS Ecosystems Mission Area provides a critical advantage in addressing public safety, infrastructure, and security issues surrounding natural disasters and changing landscapes, strengthening America’s ability to be a hazard ready Nation.
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USGS at the 2025 Philadelphia Flower Show

USGS returns to the Philadelphia Flower Show with an exhibit featuring bees, butterflies, birds and blooms. Visit our booth at the Pennsylvania Convention Center from March 1 to 9, 2025.
USGS at the 2025 Philadelphia Flower Show

USGS at the 2025 Philadelphia Flower Show

USGS returns to the Philadelphia Flower Show with an exhibit featuring bees, butterflies, birds and blooms. Visit our booth at the Pennsylvania Convention Center from March 1 to 9, 2025.
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Direct Effects of Pesticides and Other Grassland Management Practices on the North American Monarch Butterfly (Danaus plexippus plexippus): A systematic review

This review synthesizes recent scientific literature on the effects of grassland management practices and pesticide applications on monarch butterflies (Danaus plexippus), focusing on studies published since the 2020 U.S. Fish and Wildlife Service Species Status Assessment (SSA).
Direct Effects of Pesticides and Other Grassland Management Practices on the North American Monarch Butterfly (Danaus plexippus plexippus): A systematic review

Direct Effects of Pesticides and Other Grassland Management Practices on the North American Monarch Butterfly (Danaus plexippus plexippus): A systematic review

This review synthesizes recent scientific literature on the effects of grassland management practices and pesticide applications on monarch butterflies (Danaus plexippus), focusing on studies published since the 2020 U.S. Fish and Wildlife Service Species Status Assessment (SSA).
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Environmental DNA reveals invasion of Puerto Rican waterways by non-native Clarias catfish

The Sharptooth walking catfish (Clarias gariepinus) is native to parts of the Middle East, Asia, and Africa but is one of the world's most invasive freshwater fish species. The species’ ability to invade is partly due to its ability to breathe atmospheric oxygen, thereby avoiding hypoxia or poor water quality in receiving waterbodies; further, it can crawl over moist land to disperse to new...
Environmental DNA reveals invasion of Puerto Rican waterways by non-native Clarias catfish

Environmental DNA reveals invasion of Puerto Rican waterways by non-native Clarias catfish

The Sharptooth walking catfish (Clarias gariepinus) is native to parts of the Middle East, Asia, and Africa but is one of the world's most invasive freshwater fish species. The species’ ability to invade is partly due to its ability to breathe atmospheric oxygen, thereby avoiding hypoxia or poor water quality in receiving waterbodies; further, it can crawl over moist land to disperse to new...
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Spatial application of the Priority Amphibian and Reptile Conservation Areas (PARCA) Guidance in the northeastern United States

Amphibian and reptile populations are facing rapid declines resulting from a variety of threats, including disease, overexploitation, invasive species , and habitat loss.
Spatial application of the Priority Amphibian and Reptile Conservation Areas (PARCA) Guidance in the northeastern United States

Spatial application of the Priority Amphibian and Reptile Conservation Areas (PARCA) Guidance in the northeastern United States

Amphibian and reptile populations are facing rapid declines resulting from a variety of threats, including disease, overexploitation, invasive species , and habitat loss.
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Structured decision-making workshop: Chronic wasting disease management of cervids in Massachusetts

USGS researchers at the Massachusetts Cooperative Fish and Wildlife Research Unit hosted a structured decision-making workshop that evaluated management decisions for chronic wasting disease. This document describes the results of a 2.5-day rapid decision prototype workshop that evaluated management activities for chronic wasting disease (CWD) in Massachusetts (MA) that were either proactive (i.e...
Structured decision-making workshop: Chronic wasting disease management of cervids in Massachusetts

Structured decision-making workshop: Chronic wasting disease management of cervids in Massachusetts

USGS researchers at the Massachusetts Cooperative Fish and Wildlife Research Unit hosted a structured decision-making workshop that evaluated management decisions for chronic wasting disease. This document describes the results of a 2.5-day rapid decision prototype workshop that evaluated management activities for chronic wasting disease (CWD) in Massachusetts (MA) that were either proactive (i.e...
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Cumulative effects assessment of restoration programs: a framework to assess achievement of regional and programmatic goals

Increasing global investments focused on conservation and restoration of natural resources aim to address challenges presented by climate change and biodiversity loss.
Cumulative effects assessment of restoration programs: a framework to assess achievement of regional and programmatic goals

Cumulative effects assessment of restoration programs: a framework to assess achievement of regional and programmatic goals

Increasing global investments focused on conservation and restoration of natural resources aim to address challenges presented by climate change and biodiversity loss.
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Tribal Engagement

In the Department of Interior’s initiative, Vision for the Future, is an objective to support Tribal Nations. U.S. Geological Survey Cooperative Fish and Wildlife Research Unit scientists, staff, and students support Tribal Nations through collaborative research, technical assistance, and graduate student training. Units are collaborating with First Nations to solve natural resource problems...
Tribal Engagement

Tribal Engagement

In the Department of Interior’s initiative, Vision for the Future, is an objective to support Tribal Nations. U.S. Geological Survey Cooperative Fish and Wildlife Research Unit scientists, staff, and students support Tribal Nations through collaborative research, technical assistance, and graduate student training. Units are collaborating with First Nations to solve natural resource problems...
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Biological Feasibility of Introducing Bighorn Sheep to the Jicarilla Apache Nation

The biological feasibility of introducing Rocky Mountain bighorn sheep (Ovis canadensis canadensis) to the Dulce area of the Jicarilla Apache Nation (JAN) depends on the availability and condition of potential habitat and the potential for disease risk, as pneumonia is the largest current threat to wild sheep populations. USGS researchers at the New Mexico Cooperative Fish and Wildlife Research...
Biological Feasibility of Introducing Bighorn Sheep to the Jicarilla Apache Nation

Biological Feasibility of Introducing Bighorn Sheep to the Jicarilla Apache Nation

The biological feasibility of introducing Rocky Mountain bighorn sheep (Ovis canadensis canadensis) to the Dulce area of the Jicarilla Apache Nation (JAN) depends on the availability and condition of potential habitat and the potential for disease risk, as pneumonia is the largest current threat to wild sheep populations. USGS researchers at the New Mexico Cooperative Fish and Wildlife Research...
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Northern Mexican Gartersnake Demographics and Movement Ecology

USGS researchers at the Arizona Cooperative Fish and Wildlife Research Unit are analyzing mark-recapture data collected by the Arizona Game and Fish Department from 2008-2019. The northern Mexican gartersnake (Thamnophis eques; hereafter NMGS) is a federally threatened species occurring in riparian areas in central and southeast Arizona and west-central New Mexico. While previous studies have...
Northern Mexican Gartersnake Demographics and Movement Ecology

Northern Mexican Gartersnake Demographics and Movement Ecology

USGS researchers at the Arizona Cooperative Fish and Wildlife Research Unit are analyzing mark-recapture data collected by the Arizona Game and Fish Department from 2008-2019. The northern Mexican gartersnake (Thamnophis eques; hereafter NMGS) is a federally threatened species occurring in riparian areas in central and southeast Arizona and west-central New Mexico. While previous studies have...
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Sustaining Horseshoe Crabs and Supporting Migratory Shorebirds in the Delaware Bay

USGS is developing predictive models to inform sustainable harvest of horseshoe crabs ( Limulus polyphemus) in Delaware Bay to help managers make decisions to support needs of people and shorebirds including rufa red knot ( Calidris canutus rufa).
Sustaining Horseshoe Crabs and Supporting Migratory Shorebirds in the Delaware Bay

Sustaining Horseshoe Crabs and Supporting Migratory Shorebirds in the Delaware Bay

USGS is developing predictive models to inform sustainable harvest of horseshoe crabs ( Limulus polyphemus) in Delaware Bay to help managers make decisions to support needs of people and shorebirds including rufa red knot ( Calidris canutus rufa).
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Environmental DNA (eDNA) surveillance of the federally threatened Slender Chub (Erimystax cahni) in the Clinch River and Powell River

USGS researchers at the Tennessee Fishery Research Unit are using eDNA sampling to determine if slender chub exists or could be restored. The slender chub (Erimystax cahni) is a federally threatened fish native to and geographically restricted to eastern North America. More specifically, the Powell, Clinch, and lower Holston Rivers in Tennessee were historical collection areas. Habitat degradation...
Environmental DNA (eDNA) surveillance of the federally threatened Slender Chub (Erimystax cahni) in the Clinch River and Powell River

Environmental DNA (eDNA) surveillance of the federally threatened Slender Chub (Erimystax cahni) in the Clinch River and Powell River

USGS researchers at the Tennessee Fishery Research Unit are using eDNA sampling to determine if slender chub exists or could be restored. The slender chub (Erimystax cahni) is a federally threatened fish native to and geographically restricted to eastern North America. More specifically, the Powell, Clinch, and lower Holston Rivers in Tennessee were historical collection areas. Habitat degradation...
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Control of Introduced American Bullfrogs and Support of Chiricahua Leopard Frog Conservation in Southeast Arizona

USGS researchers at the Arizona Cooperative Fish and Wildlife Research Unit conducted field surveys in Arizona to control introduced American bullfrogs. This report summaries field surveys conducted during July 2023 through April 2024 to control introduced American bullfrogs (Lithobates [Rana] catesbeianus; hereafter bullfrog) and support Chiricahua leopard frog (Lithobates [Rana] chiricahuensis)...
Control of Introduced American Bullfrogs and Support of Chiricahua Leopard Frog Conservation in Southeast Arizona

Control of Introduced American Bullfrogs and Support of Chiricahua Leopard Frog Conservation in Southeast Arizona

USGS researchers at the Arizona Cooperative Fish and Wildlife Research Unit conducted field surveys in Arizona to control introduced American bullfrogs. This report summaries field surveys conducted during July 2023 through April 2024 to control introduced American bullfrogs (Lithobates [Rana] catesbeianus; hereafter bullfrog) and support Chiricahua leopard frog (Lithobates [Rana] chiricahuensis)...
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Wastewater reuse may be detrimental to smallmouth bass abundance in the Shenandoah River Watershed

Issue: Municipal and industrial wastewater effluent is an important source of water for streams and rivers, especially during periods of low flow. The reuse of wastewater effluent may become even more important if climate change exacerbates low streamflow and drought conditions. However, wastewater effluent often contains chemicals that, when chronically present, can affect the health of aquatic...
Wastewater reuse may be detrimental to smallmouth bass abundance in the Shenandoah River Watershed

Wastewater reuse may be detrimental to smallmouth bass abundance in the Shenandoah River Watershed

Issue: Municipal and industrial wastewater effluent is an important source of water for streams and rivers, especially during periods of low flow. The reuse of wastewater effluent may become even more important if climate change exacerbates low streamflow and drought conditions. However, wastewater effluent often contains chemicals that, when chronically present, can affect the health of aquatic...
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Trends in colony sizes for five colonial waterbird species in the Atlantic flyway

USGS researchers at the Maine Cooperative Fish and Wildlife Research Unit combined two databases and survey data on five species: Double-crested Cormorant (Phalacrocorax auritus), Laughing Gull (Leucophaeus atricilla), Least Tern (Sternula antillarum), Common Tern (Sterna hirundo), and Black Skimmer (Rynchops niger). Robust estimates of colonial waterbird (CWB) breeding population trends are...
Trends in colony sizes for five colonial waterbird species in the Atlantic flyway

Trends in colony sizes for five colonial waterbird species in the Atlantic flyway

USGS researchers at the Maine Cooperative Fish and Wildlife Research Unit combined two databases and survey data on five species: Double-crested Cormorant (Phalacrocorax auritus), Laughing Gull (Leucophaeus atricilla), Least Tern (Sternula antillarum), Common Tern (Sterna hirundo), and Black Skimmer (Rynchops niger). Robust estimates of colonial waterbird (CWB) breeding population trends are...
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Updated decision analysis to inform multi-species salmonine management in Lake Michigan

USGS researchers at the Georgia Cooperative Fish and Wildlife Research Unit are using decision analysis to help inform multi-species salmon management in Lake Michigan. The recreational fishery for salmonine species in Lake Michigan (lake trout, Chinook salmon, coho salmon, steelhead, and brown trout) is largely maintained through stocking. Decisions about how many of each species to stock require...
Updated decision analysis to inform multi-species salmonine management in Lake Michigan

Updated decision analysis to inform multi-species salmonine management in Lake Michigan

USGS researchers at the Georgia Cooperative Fish and Wildlife Research Unit are using decision analysis to help inform multi-species salmon management in Lake Michigan. The recreational fishery for salmonine species in Lake Michigan (lake trout, Chinook salmon, coho salmon, steelhead, and brown trout) is largely maintained through stocking. Decisions about how many of each species to stock require...
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Striped bass exploitation in tailwater habitats of East-central Oklahoma

USGS researchers at the Georgia Cooperative Fish and Wildlife Research Unit are evaluating striped bass in the tailwaters of Tenkiller Lake and Lake Eufaula, Georgia. Striped Bass (Morone saxatilis) is naturally anadromous, but a few land-locked populations have been documented that are self-sustaining, including fish in the Arkansas River, Oklahoma. This rare population is the source of brood...
Striped bass exploitation in tailwater habitats of East-central Oklahoma

Striped bass exploitation in tailwater habitats of East-central Oklahoma

USGS researchers at the Georgia Cooperative Fish and Wildlife Research Unit are evaluating striped bass in the tailwaters of Tenkiller Lake and Lake Eufaula, Georgia. Striped Bass (Morone saxatilis) is naturally anadromous, but a few land-locked populations have been documented that are self-sustaining, including fish in the Arkansas River, Oklahoma. This rare population is the source of brood...
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Evaluating the spatial and temporal distribution and ecology of Bighead and Silver Carp and native fishes of the lower Red River basin

USGS researchers at the Alabama Cooperative Fish and Wildlife Research Unit investigated the spatial and temporal distribution of Bighead Carp and Silver Carp (hereafter Carp) in the lower Red River basin of Arkansas. Our study objectives were: 1) determine the spatial and temporal extent of Bighead and Silver Carp in the Red River basin of Arkansas; 2) determine habitat associations of large...
Evaluating the spatial and temporal distribution and ecology of Bighead and Silver Carp and native fishes of the lower Red River basin

Evaluating the spatial and temporal distribution and ecology of Bighead and Silver Carp and native fishes of the lower Red River basin

USGS researchers at the Alabama Cooperative Fish and Wildlife Research Unit investigated the spatial and temporal distribution of Bighead Carp and Silver Carp (hereafter Carp) in the lower Red River basin of Arkansas. Our study objectives were: 1) determine the spatial and temporal extent of Bighead and Silver Carp in the Red River basin of Arkansas; 2) determine habitat associations of large...
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Diseases of Fish and Wildlife

The coronavirus pandemic, Chronic Wasting Disease (CWD) in white-tailed deer, and white-nose syndrome in bats have spawned great interest in diseases of native fish and wildlife. Many aspects of widely known diseases of wild (as opposed to domestic) animal populations are poorly understood, including their ecology, incidence, distribution, and methods for reducing effects of disease on culturally...
Diseases of Fish and Wildlife

Diseases of Fish and Wildlife

The coronavirus pandemic, Chronic Wasting Disease (CWD) in white-tailed deer, and white-nose syndrome in bats have spawned great interest in diseases of native fish and wildlife. Many aspects of widely known diseases of wild (as opposed to domestic) animal populations are poorly understood, including their ecology, incidence, distribution, and methods for reducing effects of disease on culturally...
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