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Blooming wildflowers in Pinnacles National Park.

The circular highlights how our research efforts fulfill larger USGS strategic goals.

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Tricolored Heron at Ding Darling National Park

This book is dedicated to those who are or have been associated with the unit program. 

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Yellow-billed Loon on a lake in the northern area of Alaska.

This report provides abstracts of most of the ongoing and recently completed research.

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Filter Total Items: 3984

Attack of the PCR clones: Rates of clonality have little effect on RAD-seq genotype calls

Interpretation of high-throughput sequence data requires an understanding of how decisions made during bioinformatic data processing can influence results. One source of bias that is often cited is PCR clones (or PCR duplicates). PCR clones are common in restriction site-associated sequencing (RAD-seq) data sets, which are increasingly being used for molecular ecology. To determine the influence P
Authors
Peter T. Euclide, Garrett McKinney, Matthew Bootsma, Charlene Tarsa, Mariah Meek, Wesley Larson
By
Cooperative Research Units

Distribution and status of trout and char in North America

No abstract available.
Authors
Phaedra Budy, Kevin B. Rogers, Yoichiro Kanno, Brooke E Penaluna, Nathaniel Hitt, Gary P. Thiede, Jason B. Dunham, Chad Mellison, William Somer, James DeRito
By
Cooperative Research Units

Computational sustainability: Computing for a better world and a sustainable future

Computational sustainability aims to develop computational methods to help solve environmental, economic, and societal problems and thereby facilitate a path towards a sustainable future. Sustainability problems are unique in scale, impact, complexity, and richness, offering challenges but also opportunities for the advancement of the state of the art of computing and information science.
Authors
Carla Gomes, Thomas Dietterich, Christopher Barrett, Jon Conrad, Bistra Dilkina, Stefano Ermon, Fei Fang, Andrew Farnsworth, Alan Fern, Xiaoli Fern, Daniel Fink, Daniel Fisher, Alexander Flecker, Daniel Freund, Angela K. Fuller, John Gregoire, John Hopcroft, Steve Kelling, Zico Kolter, Warren Powell, Nicole Sintov, John Selker, Bart Selman, Daniel Sheldon, David Shmoys, Milind Tambe, Weng-keen Wong, Christopher Wood, Xiaojian Wu, Yexiang Xue, Abdul-Aziz Yakuba, Amulya Yadav, Mary Lou Zeeman
By
Cooperative Research Units

Clarifying how hunt-specific experiences affect satisfaction among more avid and less avid waterfowl hunters

Marketing research methods could enhance understanding of hunter satisfaction, a key metric for state wildlife management agencies. We use three marketing research approaches—revised importance-performance, importance-grid, and penalty-reward-contrast analysis—to examine the determinants of waterfowl hunter satisfaction. These methods have seen limited application in research on hunting and other
Authors
David C. Fulton, Susan A. Schroeder, Louis Cornicelli, Steven D. Cordts, Jeffrey S. Lawrence
By
Cooperative Research Units

Framework for using downscaled climate model projections in ecological experiments to quantify plant and soil responses

Soil and plant responses to climate change can be quantified in controlled settings. However, the complexity of climate projections often leads researchers to evaluate ecosystem response based on general trends, rather than specific climate model outputs. Climate projections capture spatial and temporal climate extremes and variability that are lost when using mean climate trends. In addition, app
Authors
Rachel K. Owen, Elisabeth B. Webb, Keith W. Goyne, Bohumil M. Svoma, Sagar Gautam
By
Cooperative Research Units

Effects of air exposure on survival of Yellowstone Cutthroat Trout angled from a stream with warm water temperatures

We evaluated the effects of air exposure on Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri caught and released in a cold-water stream with elevated water temperatures (i.e., > 14°C) in southeastern Idaho. Anglers caught fish in a 2.3-km section of Fall Creek, Idaho, during August 2018. Sampled fish remained underwater while we measured and then tagged them with T-bar anchor tags. We exp
Authors
Darcy K. McCarrick, Curtis J. Roth, Daniel J. Schill, Brett High, Michael Quist
By
Cooperative Research Units

An importance–satisfaction analysis of trout license holders in Georgia

As anglers become increasingly diverse, fisheries managers are challenged to find ways to satisfy users with divergent preferences while conserving a limited resource on a limited budget. With this management challenge in mind, this study combines previous angler specialization research with an importance–satisfaction analysis (ISA) to aid fisheries managers in better understanding users with dive
Authors
H. J. TenHarmsel, B. B. Boley, Brian J. Irwin, Cecil A. Jennings
By
Cooperative Research Units

A food web modeling assessment of Asian Carp impacts in the Middle and Upper Mississippi River, USA

The invasion of non-native fishes has caused a great detriment to many of our native fishes. Since the introduction of invasive carps, such as Silver, Bighead, Common and Grass Carp, managers and researcher have been struggling to remove these species while also hypothesizing the detriment of further invasion. This study developed a food web model of four locations on the Mississippi River and use
Authors
Nicholas W. Kramer, Quinton E. Phelps, Clay Pierce, Michael E. Colvin
By
Cooperative Research Units

Invertebrate prey contributions to juvenile Coho Salmon diet from riparian habitats along three Alaska streams: Implications for environmental change

Stream fish rely on a mix of terrestrial and aquatic prey sources. While the importance of terrestrial invertebrates as a food source for stream fish is well documented, the role of aquatic insects that emerge from the stream as winged adult insects (aquatic winged adults) and return to the stream as prey is less understood. In this study we determined the proportion of total diet for stream-reari
Authors
Jess Grunblatt, Benjamin E. Meyer, Mark S. Wipfli
By
Cooperative Research Units

Strategic conservation for lesser prairie-chickens among landscapes of varying anthropogenic influence

For millennia grasslands have provided a myriad of ecosystem services and have been coupled with human resource use. The loss of 46% of grasslands worldwide necessitates the need for conservation that is spatially, temporally, and socioeconomically strategic. In the Southern Great Plains of the United States, conversion of native grasslands to cropland, woody encroachment, and establishment of ver
Authors
Daniel S. Sullins, David A. Haukos, Joseph M. Lautenbach, Jonathan Lautenbach, Samantha G. Robinson, Mindy B. Rice, Brett K. Sandercock, John D. Kraft, Reid T. Plumb, Jonathan H. Reitz, J. M. Shawn Hutchinson, Christian A. Hagen
By
Cooperative Research Units

Influence of climate change and postdelisting management on long-term population viability of the conservation-reliant Kirtland's Warbler

Rapid global climate change is resulting in novel abiotic and biotic conditions and interactions. Identifying management strategies that maximize probability of long-term persistence requires an understanding of the vulnerability of species to environmental changes. We sought to quantify the vulnerability of Kirtland's Warbler (Setophaga kirtlandii), a rare Neotropical migratory songbird that bree
Authors
Donald J. Brown, Deahn M. Donner, Christine Ribic, Carol I. Bocetti
By
Cooperative Research Units

Temporally adaptive acoustic sampling to maximize detection across a suite of focal wildlife species

Acoustic recordings of the environment can produce species presence–absence data for characterizing populations of sound-producing wildlife over multiple spatial scales. If a species is present at a site but does not vocalize during a scheduled audio recording survey, researchers may incorrectly conclude that the species is absent (“false negative”). The risk of false negatives is compounded when
Authors
Cathleen Balantic, Therese M. Donovan
By
Cooperative Research Units