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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Estimating recruitment rate and population dynamics at a migratory stopover site using an integrated population model Estimating recruitment rate and population dynamics at a migratory stopover site using an integrated population model
Consideration of the full annual cycle population dynamics can provide useful insight for conservation efforts, but collecting data needed to estimate demographic parameters is often logistically difficult. For species that breed in remote areas, monitoring is often conducted during migratory stopover or at nonbreeding sites, and the recruitment rate of new breeding adults can be...
Authors
Anna Maureen Tucker, Conor P. McGowan, Bryan L. Nuse, James E. Lyons, Clinton T. Moore, David R. Smith, John A. Sweka, Kristen A. Anstead, Audrey DeRose-Wilson, Nigel A. Clark
Exploring the stony coral tissue loss disease bacterial pathobiome Exploring the stony coral tissue loss disease bacterial pathobiome
A devastating novel coral disease outbreak, referred to as Stony Coral Tissue Loss Disease (SCTLD), was first described in 2014. It is thought to have originated offshore of Miami-Dade County, FL, but has persisted and spread, affecting new reefs along the Florida Reef Tract and reefs of at least 8 other Caribbean jurisdictions. We investigated the microbial communities of clinically...
Authors
Deborah Iwanowicz, W. Bane Schill, C.M. Woodley, Andy Bruckner, K. Neely, Kay M. Briggs
Habitat management for stopover and breeding songbird communities along rights-of-way in forest-dominated landscapes Habitat management for stopover and breeding songbird communities along rights-of-way in forest-dominated landscapes
The proliferation of energy rights-of-way (pipelines and powerlines; ROWs) in the central Appalachian region has prompted wildlife management agencies to consider ways to use these features to manage and conserve at-risk songbird species. However, little empirical evidence exists regarding best management strategies to enhance habitat surrounding ROWs for the songbird community during...
Authors
Eric L. Margenau, Petra B. Wood, Christopher T. Rota
Haploid gynogens facilitate disomic marker development in paleotetraploid sturgeons Haploid gynogens facilitate disomic marker development in paleotetraploid sturgeons
Acipenseriformes (sturgeons and paddlefishes) are of substantial conservation concern, and development of genomic resources for these species is difficult due to past whole genome duplication. Development of disomic markers for polyploid organisms can be challenging due to difficulty in resolving alleles at a single locus from those among duplicated loci. In this study, we detail the...
Authors
Richard Flamio, Dominic G Swift, David S Portnoy, Kimberly Chojnacki, Aaron J. DeLonay, Jeffrey Powell, Patrick Braaten, Edward J. Heist
High-precision 40Ar/39Ar dating of Quaternary basalts from Auckland Volcanic Field, New Zealand, with implications for eruption rates and paleomagnetic correlations High-precision 40Ar/39Ar dating of Quaternary basalts from Auckland Volcanic Field, New Zealand, with implications for eruption rates and paleomagnetic correlations
The Auckland Volcanic Field (AVF), which last erupted ca. 550 years ago, is a late Quaternary monogenetic basaltic volcanic field (ca. 500 km2) in the northern North Island of New Zealand. Prior to this study only 12 out of the 53 identified eruptive centres of the AVF had been reliably dated. Careful sample preparation and 40Ar/39Ar analysis has increased the number of well-dated...
Authors
Graham S. Leonard, Andrew T. Calvert, Jenni L Hopkins, Colin J.N. Wilson, Elaine R. Smid, Jan Lindsay, Duane E. Champion
Host vs. pathogen evolutionary arms race: Effects of exposure history on individual response to a genetically diverse pathogen Host vs. pathogen evolutionary arms race: Effects of exposure history on individual response to a genetically diverse pathogen
Introduction: Throughout their range, bighorn sheep (Ovis canadensis) populations have seen significant disease-associated declines. Unfortunately, understanding of the underlying epidemiological processes driving the disease dynamics in this species has hindered conservation efforts aimed at improving the health and long-term viability of these populations. Individual response to...
Authors
Daniel P. Walsh, Brandi L. Felts, E. Frances Cassirer, Thomas E. Besser, Jonathan A. Jenks
Identifying mismatches between conservation area networks and vulnerable populations using spatial randomization Identifying mismatches between conservation area networks and vulnerable populations using spatial randomization
Grassland birds are among the most globally threatened bird groups due to substantial degradation of native grassland habitats. However, the current network of grassland conservation areas may not be adequate for halting population declines and biodiversity loss. Here, we evaluate a network of grassland conservation areas within Wisconsin, U.S.A., that includes both large Focal...
Authors
Laura A. Nunes, Christine Ribic, Benjamin Zuckerberg
Mid-Atlantic big brown and eastern red bats: Relationships between acoustic activity and reproductive phenology Mid-Atlantic big brown and eastern red bats: Relationships between acoustic activity and reproductive phenology
Acoustic data are often used to describe bat activity, including habitat use within the summer reproductive period. These data inform management activities that potentially impact bats, currently a taxa of high conservation concern. To understand the relationship between acoustic and reproductive timing, we sampled big brown bats (Eptesicus fuscus) and eastern red bats (Lasiurus borealis...
Authors
Sabrina Deeley, W. Mark Ford, Nicholas Kalen, Samuel R. Freeze, Micheal St. Germain, Michael Muthersbaugh, Elaine Barr, Andrew Kniowski, Alexander Silvis, Jesse De La Cruz
Population estimates and land cover use of wintering Mountain Plovers in Texas Population estimates and land cover use of wintering Mountain Plovers in Texas
Conservation of migratory birds throughout the full annual cycle requires a comprehensive understanding of abundance and distribution in interconnected breeding, migration, and wintering habitats. The Mountain Plover (Anarhynchus montanus) is a rare endemic breeder of the Rocky Mountain and Great Plains regions that migrates to wintering grounds in the southwestern USA and northern...
Authors
James E. Lyons, Brad A. Andres, Kelli L. Stone, Allison K. Pierce, Kammie L. Kruse
Reconnaissance basement geology and tectonics of North Zealandia Reconnaissance basement geology and tectonics of North Zealandia
New rock dredge samples supply key information to establish the tectonic and geological framework of the northern two-thirds of the 95% submerged Zealandia continent. The R/V Investigator voyage IN2016T01 to the Fairway Ridge, Coral Sea, obtained poorly sorted poly-lithologic pebbly to cobbly sandstones, well sorted fine grained sandstones, mudstones, bioclastic limestones, and basaltic...
Authors
Nick Mortimer, Simon Williams, Maria Seton, Andrew T. Calvert, Tod Waight, Rose E. Turnbull, Demian Nelson, Mike Palin, Jahandar Ramezani, Matthew W. Sagar, Andy Tulloch, Wanda Stratford, Julien Collot, Samuel Etienne
Reevaluation of thermal maturity and stages of petroleum formation of the Mississippian Barnett Shale, Fort Worth Basin, Texas Reevaluation of thermal maturity and stages of petroleum formation of the Mississippian Barnett Shale, Fort Worth Basin, Texas
New data including measured reflectance (%Ro), programmed open-system pyrolysis data, and kerogen elemental analyses obtained on the Mississippian Barnett Shale in the Fort Worth Basin, Texas, indicate that secondary-gas generation starts at 1.5% Ro and not at the previously prescribed 1.1% Ro. Oil-cracking kinetic parameters derived from pyrolysis experiments in the presence and absence...
Authors
Michael Lewan, M.J. Pawlewicz
Remote sensing-based actual evapotranspiration assessment in a data-scarce area of Brazil: A case study of the Urucuia Aquifer System Remote sensing-based actual evapotranspiration assessment in a data-scarce area of Brazil: A case study of the Urucuia Aquifer System
The large groundwater reserves of the Urucuia Aquifer System (UAS) enabled agricultural development and economic growth in the western Bahia State, in northeastern Brazil. Over the last several years, concern has grown around the aquifer’s diminishing water levels, and water balance (WB) studies are in demand. Considering the lack of measured actual evapotranspiration (ETa), a major...
Authors
Bruno César Comini de Andrade, Eber José de Andrade Pinto, Anderson Ruhoff, Gabriel B. Senay