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The CRU program remains very productive and maintains a bright future. One of the things contributing to that bright future is a $5.6 million increase in our most recent Congressional appropriations. This amount will help us meet longstanding programmatic needs, such as filling all the vacancies in our scientific workforce and providing much-needed upgrades to our research equipment.

CRU Science
Filter Total Items: 25
Date published: July 31, 2019
Status: Active

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...

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 corridors of mule deer in the Pequop Mountains, Nevada

The Area 7 mule deer population is one of the state’s largest deer herds with an estimated population of about 11,000 in 2019. This deer herd is highly important to Nevada from an economic and ecological perspective. It’s one of the longest distance deer migrations in the state of Nevada with some animals known to migrate over 120 miles during a single migration. A subset of th

Date published: November 9, 2020

Migration corridors 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 Routes of Mule Deer in the Upper Shoshone Herd in Wyoming

Mule deer within the Upper Shoshone herd make a number of significant, long-distance migrations west into the core of the Greater Yellowstone Ecosystem. The longest is a 133-mile (214-km) migration that originates at the mouth of the South Fork of the Shoshone River near Buffalo Bill Reservoir and ends at Jenny Lake in Grand Teton National Park. Deer in the Upper Shoshone herd winter in the...

Date published: November 9, 2020

Winter Range of Elk in the Interstate 17 Herd in Arizona

The Interstate 17 (I-17) elk herd primarily resides in Arizona’s GMU 6A and 11M south of Flagstaff. The population estimate for elk in GMU 6A was 6,500 in 2019. Their summer range consists of gentle topography with ponderosa pine forest and interspersed riparian-meadow habitat. Annually, the I-17 elk herd migrates an average of 24 miles to lower-elevation winter range dominated by

Date published: November 9, 2020

Migration Corridors of Mule Deer in the San Francisco Peaks Herd in Arizona

In 2008, 13 mule deer were GPS collared near the South Rim of the Grand Canyon to understand the impact of Arizona’s State Route 64 on mule deer movement. Unexpectedly, 4 individuals migrated over 50 miles to summer range near the San Francisco Peaks, north of Flagstaff, containing alpine, subalpine, and ponderosa pine habitats. The GPS collars dropped in 2009, but questions

Date published: November 9, 2020

Migration Routes of Mule Deer in Clarks Fork Herd in Wyoming

Mule deer within the Clarks Fork herd make a number of significant westward long-distance migrations. These migrations originate north of Cody, near Heart Mountain and along the foothills of Absaroka Front. There, deer winter in the lower elevation sagebrush valleys, and in spring an estimated 2,700 deer head west into the high elevation mountain valleys of the Absaroka Range and Yellowst

Date published: November 9, 2020

Migration routes 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 Elk in Cody Herd in Wyoming

The Cody elk herd migrates across rugged country on the eastern side of the Absaroka Mountains near Cody, WY. This large herd of 6,000-7,000 animals winters in foothill habitat to the south and west of Cody. There are three core winter areas, namely the valleys formed by the North and South Fork of the Shoshone River and the headwaters of the Greybull River north to Meeteetse creek. In sp

Date published: November 9, 2020

Stopovers of mule deer in the Sublette Herd, Wyoming

The Platte Valley Herd Corridor was designated by the Wyoming Game and Fish Department in 2018 (fig. 30). The Platte Valley herd contains approximately 11,000 mule deer. The corridor is based on two wintering populations, including a south segment from Saratoga, Wyoming, to the Colorado State line, and a north segment from Saratoga to the Dana Ridge area north of I-80. Winter ranges

Date published: November 9, 2020

Migration Routes of Mule Deer in the Dubois Herd in Wyoming

Mule deer within the Dubois herd make several long-distance migrations into the heart of the Greater Yellowstone Ecosystem (fig. 26). These migrations originate from winter range in the warm, protected sagebrush valley surrounding Dubois, Wyoming, and extend to the southeast on the Wind River Reservation. Each spring, an estimated 6,000–7,000 deer leave this valley and the

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

Migration Routes of Mule Deer in Atlantic Rim North Population in Wyoming

Mule deer in the Atlantic Rim North population are part of the Baggs herd unit that is managed for approximately 19,000 animals. These mule deer winter in the pinyon-juniper and sagebrush badlands near Dad, Wyoming and migrate north and east 10–35 mi (16–56 km) to various summer ranges (fig. 22). Many of these deer must navigate coal-bed methane development that is sit

Filter Total Items: 2,892
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Year Published: 2020

Longer-lived tropical songbirds reduce breeding activity as they buffer impacts of drought

Droughts are expected to increase in frequency and severity with climate change. Population impacts of such harsh environmental events are theorized to vary with life history strategies among species. However, existing demographic models generally do not consider behavioural plasticity that may modify the impact of harsh events. Here we show that...

Martin, Thomas E.; Mouton, James C.

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Year Published: 2020

Nest predation and adult mortality relationships with post-natal metabolic rates and growth among songbird species

Metabolism is thought to mediate the connection between environmental selection pressures and a broad array of life history tradeoffs, but tests are needed. High juvenile predation correlates with fast growth, which may be achieved via fast juvenile metabolism. Fast offspring metabolism and growth can create physiological costs later in life that...

Ton, Riccardo; Mitchell, Michael S.

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Year Published: 2020

Bidirectional connectivity via fish ladders in a large Neotropical river: Response to a comment

In a recent article, we described fitting electronic tags to the fish Prochilodus lineatus to document how a fishway connected aquatic habitats downstream and upstream of a major dam. Moreover, given that tagged fish remained upstream or downstream for periods extending months and years before returning to the fishway, and that observed...

Celestino, L.F.; Sanz-Ronda, F.J.; Miranda, Leandro E.; Makrakis, M.C.; Pinheiro Dias, J.H.; Makrakis, S.

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Year Published: 2020

Adaptive management in wildlife conservation

No abstract available.

Organ, John F.; Decker, Daniel J.; Riley, Shawn J.; Mcdonald, John E.; Mahoney, Shane P.

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Year Published: 2020

Managing state lands for wildlife

State-owned lands are a vital component of state fish and wildlife management programs because they contain valuable habitats for a diversity of wild species and often provide important public access. The Association of Fish and Wildlife Agencies (AFWA 2017) reported state agencies manage or administer approximately 188 million hectares of land,...

Ryder, Thomas; Organ, John F.

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Year Published: 2020

Effects of climate and land-use changes on fish catches across lakes at a global scale

Globally, our knowledge on lake fisheries is still limited despite their importance to food security and livelihoods. Here we show that fish catches can respond either positively or negatively to climate and land-use changes, by analyzing time-series data (1970–2014) for 31 lakes across five continents. We find that effects of a climate or land-...

Kao, Y.; Rogers, Mark W.; Bunnell, David; Cowx, I. G.; Qian, S. S.; Anneville, O.; Beard, T. Douglas; Brinker, A.; Britton, J. R.; Chura-Crusz, R.; Gownaris, N. J.; Jackson, J. R.; Kangur, K.; Kolding, J.; Lukin, A.A.; Lynch, Abigail; Mercado-Silva, N.; Moncayo-Estrada, R.; Njaya, F. J.; Ostrovsky, I.; Rudstam, L.G.; Sandström, A. L. E.; Sato, Y.; Siguayro-Mamani, Humberto; Thorpe, A.; van Zwieten, P. A. M.; Volta, P.; Wang, Y. Q.; Weiperth, A.; Weyl, O. L. F.; Young, Joelle D.

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Year Published: 2020

Decision implementation and the double-loop process in adaptive management of horseshoe crab harvest in Delaware Bay

No abstract available.

McGowan, Conor P.; Smith, David; Lyons, James E.

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Year Published: 2020

Movement ecology and habitat use differences in Black Scoters wintering along the Atlantic coast

For migratory species such as Black Scoters (Melanitta americana) whose range encompasses a variety of habitats, it is especially important to obtain habitat use information across the species’ range to better understand anthropogenic threats, e.g., marine development and climate change. The objective of our study was to investigate the winter...

Plumpton, H. M.; Gilliland, S. G.; Ross, Beth

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Year Published: 2020

FiCli, the Fish and Climate Change Database, informs climate adaptation and management for freshwater fishes

Inland fishes provide important ecosystem services to communities worldwide and are especially vulnerable to the impacts of climate change. Fish respond to climate change in diverse and nuanced ways, which creates challenges for practitioners of fish conservation, climate change adaptation, and management. Although climate change is known to...

Krabbenhoft, Trevor J. ; Myers, Bonnie Jean Evaline; Wong, Jesse; Chu, Cindy ; Tingley, Ralph W. III; Falke, Jeffrey A.; Kwak, Thomas J.; Paukert, Craig P.; Lynch, Abigail

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Year Published: 2020

Understanding sportsperson retention and reactivation through license purchasing behavior

Most state and provincial fish and wildlife agencies have access to important information about patterns in sportsperson participation through their license databases. Using transaction data from Nebraska Game and Parks Commission's electronic hunting and fishing license system, we tracked license purchases of Nebraska, USA, resident license...

Hinrichs, M.P.; Price, N.B.; Gruntorad, M.P.; Pope, Kevin L.; Fontaine, Joseph J.; Chizinski, C.J.

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Year Published: 2020

InFish: A professional network to promote global conservation and responsible use of inland fish

Inland fishes and fisheries make substantial contributions to individuals, society, and the environment in a changing global landscape that includes climate, water allocations, and societal changes. However, current limitations to valuing the services provided by inland fish and their fisheries often leaves them out of key decision‐making...

Lynch, Abigail J; Bartley, Devin M.; Beard, T. Douglas; Bunnell, David; Cooke, Steve J.; Cowx, Ian. G.; Funge-Smith, Simon; Paukert, Craig; Rogers, Mark W.; Taylor, William W.

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Year Published: 2020

Thermal diversity of salmon streams in the Matanuska-Susitna Basin, Alaska

We present the first description of summer stream thermal regimes in Alaska using metrics that represent the magnitude, variability, frequency, duration, and timing of temperature events related to salmon life histories. We used cluster analysis to characterize thermal regimes present in the Matanuska-Susitna (Mat-Su) Basin based on 10...

Shaftel, Rebecca; Mauger, Sue; Falke, Jeffrey A.; Rinella, Daniel; Davis, Jeff; Jones, Leslie

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
Assessing the Functional Equivalency of Hawaiian fishponds
July 29, 2018

Assessing the Functional Equivalency of Hawaiian fishponds

Hawaiian fishponds were important cultural and economic resources for native Hawaiians as they were an important component of a sophisticated, integrated food production system. However, changing demographics and systems of land ownership resulted in a decline in the use and upkeep of Hawaiian fishponds throughout the 19th century. The cultural value of Hawaiian fishponds

...
Canada lynx
June 21, 2018

Canada Lynx

– Scientists at the USGS Massachusetts Cooperative Fish and
Wildlife Research Unit at the University of Massachusetts Amherst, in
collaboration with The Rockefeller University’s Vertebrate Genome Laboratory,
New York, are releasing to a public repository at the vertebrate lab, for use by
geneticists, conservationists and other researchers around the

...
 A Zone-tailed Hawk in flight.
May 4, 2018

Zone-tailed hawk in flight

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 conditions for vegetation dependent on permanent or ephemeral surface and subsurface water. This results in desert riparian zones provide important

...
 Assessing the distribution and habitat needs of the least darter
April 27, 2018

Assessing the distribution and habitat needs of the least darter

Isolated populations may benefit from different conservation and management activities. The least darter is a species of conservation concern that has two isolated populations occupying parts of the Arbuckle Mountain and Ozark Highlands ecoregions. The goal of this research is to assess different environmental factors at multiple spatial scales to determine the relations

...
Alligator Hatchlings
December 31, 2017

Alligator Hatchlings

Crocodilians are one of the few reptile taxa that exhibit parental care. In alligators, following nest construction, females stay nearby in a guard hole, and are known to defend their nests against predators or other intruders. At the end of the 60-day incubation period, alligator hatchlings will vocalize from within the egg, to signal to the mother that they are ready to

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Lake Sturgeon caught on the Gasconade River, Missouri.
December 14, 2017

Lake Sturgeon caught on the Gasconade River, Missouri.

Lake Sturgeon caught on the Gasconade River, Missouri.

Assessing the effects of Stocked Rainbow Trout on Native Fishes
October 8, 2017

Assessing the effects of Stocked Rainbow Trout on Native Fishes

Rainbow trout are native only to the western United States but are stocked widely throughout the country to increase fishing opportunities for anglers. Competitive interactions have been shown to be condition specific (for example, water temperature) and, thus, may only occur seasonally or under certain environmental conditions. Understanding these differences is

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 Assessing the spawning movement and habitat needs of riverine Neosho smallmouth bass
May 27, 2017

Assessing the spawning movement and habitat needs in Utah

Limited information is available about the movements of riverine smallmouth bass in landscapes with prevalent river-reservoir interfaces. This lack of information is especially problematic for the Neosho subspecies of smallmouth bass given the distribution covers an interwoven landscape of rivers and reservoirs. This research focuses on the movement and habitat use of the

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Honey bee (Apis mellifera) foraging on coffee flowers of Coffea canephora and C. arabica plants
April 6, 2017

Honey bee pollination of coffee plants

Researcher swabs the body of a honeybee with fuschin gel to later use to identify the pollen particles on the bee's body and determine what plants the bee visited. The overal purpose of the project is to enable the Department of Applied Ecology of North Carolina State University (NCSU), Center for Landscape Conservation (CLC), and the Natural Resources Conservation Service

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Advancing Adaptive Management in the Riverside East Solar Energy Zone
March 31, 2017

Advancing Adaptive Management in the Riverside East Solar Energy Zone

The Riverside East Solar Energy Zone is a vast area in southern California designated for large-scale solar development. The Bureau of Land Management (BLM) is charged with monitoring wildlife in this area to minimize the effects of the solar production on wildlife species. However, consistent monitoring of wildlife across vast spatial landscapes over time has proven to be

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American Alligator
December 31, 2016

American Alligator

USGS and other scientists have studied in-depth alligator populations in Florida and Louisiana, but basic ecological knowledge is lacking for populations at the northern edge of their range. For example, differences in climate and habitat between the southern and northern portions of the range limit the applicability of findings from other studies to South Carolina

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American Alligator
December 31, 2016

Largest American Alligator Satellite Telemetry-Tracking Study

South Carolina alligators occupy a patchwork of diverse habitats, including rivers, lakes, wooded swamps, tidal marshes, and impounded freshwater wetlands. As a mobile, opportunistic predator, alligators seasonally adjust their habitat use for feeding. For example, some Florida alligators venture into brackish water habitats to feed on nutrient-rich blue crabs during the

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Filter Total Items: 25
Date published: February 12, 2014

Identifying Bats By Sound

Recording bats' echolocation "calls" is the most efficient and least intrusive way of identifying different species of bats in a given area, providing insight into some populations that have been decimated by white-nose syndrome.