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Publications

Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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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

Pollen records, postglacial: Southeastern North America Pollen records, postglacial: Southeastern North America

Pollen records from the unglaciated southeastern region of North America provide an overview of biogeographic changes associated with vegetational migration northward following the retreat of the Laurentide Ice Sheet. Changing insolation during the Holocene affected forest composition on the Coastal Plain, and rising sea level controlled the distribution of marsh and forested wetlands...
Authors
Debra A. Willard
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