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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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Population characteristics of silver carp from the source of their North American introduction in the Lower Mississippi River Population characteristics of silver carp from the source of their North American introduction in the Lower Mississippi River

Silver carp, Hypophthalmichthys molitrix, escaped into the Lower Mississippi River (LMR) over 50 years ago, established reproductive populations, and spread across much of the Mississippi River Basin. Demographic rates of silver carp are needed to inform decisions on control and management of this invasive species, but have not been published for the LMR. The purpose of this paper is to...
Authors
Kenneth J. Killgore, Jan J. Hoover, William T. Slack, James P. Kirk, Bradley R. Lewis, Steven G. George, Leandro E. Miranda
By
Cooperative Research Units

Chronology and Paleoenvironment of the Tunga Formation, a new lowermost Miocene sequence in the East Pisco Basin of southern Peru Chronology and Paleoenvironment of the Tunga Formation, a new lowermost Miocene sequence in the East Pisco Basin of southern Peru

The East Pisco Basin, occupying the coastal plain of Peru between 13°S and 16°S, is widely known for its extensive Eocene to Quaternary biosiliceous deposits and excellent preservation of fossil marine vertebrates. Biochronologic studies published over the past 35 years record a hiatus of about 13 million years (*32–19 Ma) separating the youngest Paleogene deposits (Otuma Formation) from...
Authors
Thomas J. Devries, John A. Barron, Diana Ochoa, Kristen McDougall
By
Ecosystems Land Change Science Program, Geology, Minerals, Energy, and Geophysics Science Center

Adaptation and Response in Drylands (ARID): Community insights for scoping a NASA terrestrial ecology field campaign in drylands Adaptation and Response in Drylands (ARID): Community insights for scoping a NASA terrestrial ecology field campaign in drylands

Dryland ecosystems cover 40% of our planet's land surface, support billions of people, and are responding rapidly to climate and land use change. These expansive systems also dominate core aspects of Earth's climate, storing and exchanging vast amounts of water, carbon, and energy with the atmosphere. Despite their indispensable ecosystem services and high vulnerability to change...
Authors
Andrew F. Feldman, Sasha C. Reed, Cibele Amaral, Alicja Babst-Kostecka, Flurin Babst, Joel A. Biederman, Charles Devine, Zheng Fu, Julia K. Green, Jessica Guo, Niall P. Hanan, Raymond F. Kokaly, Marcy Litvak, Natasha MacBean, David Moore, Dennis S. Ojima, Benjamin Poulter, Russell L. Scott, William K. Smith, Robert Swap, Compton J. Tucker, Lixin Wang, Jennifer D. Watts, Konrad Wessels, Fangyue Zhang, Wen Zhang
By
Ecosystems Mission Area, Southwest Biological Science Center, Geology, Geophysics, and Geochemistry Science Center

Two-million-year eruptive history of Laguna del Maule volcanic field Two-million-year eruptive history of Laguna del Maule volcanic field

The Laguna del Maule (LdM) volcanic field, which surrounds the 54-km2 lake of that name, covers ∼500 km2 of mountainous glaciated terrain with Quaternary lavas and tuffs that extend 40 km westward from the Argentine frontier and 30 km north-south from the Río Campanario to Laguna Fea. Complementing recent investigations of postglacial volcanism and the ongoing geophysical unrest around...
Authors
Edward Hildreth, Judith E. Fierstein
By
Volcano Hazards Program, Volcano Science Center

Modeling the effects of temperature and limiting nutrients on the competition of an invasive floating plant, Pontederia crassipes, with submersed vegetation in a shallow lake Modeling the effects of temperature and limiting nutrients on the competition of an invasive floating plant, Pontederia crassipes, with submersed vegetation in a shallow lake

The potential for a non-native plant species to invade a new habitat depends on broadscale factors such as climate, local factors such as nutrient availability, and the biotic community of the habitat into which the plant species is introduced. We developed a spatially explicit model to assess the risk of expansion of a floating invasive aquatic plant species (FAV), the water hyacinth...
Authors
Linhao Xu, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Facies variation within outcrops of the Triassic Shublik Formation, northeastern Alaska Facies variation within outcrops of the Triassic Shublik Formation, northeastern Alaska

The Shublik Formation (Middle to Upper Triassic) is a heterogeneous unit that is a major hydrocarbon source rock in northern Alaska and the largest known Triassic phosphate accumulation in the world. This formation, which occurs in the subsurface and crops out within the Arctic Alaska basin, was deposited on a gently sloping ramp along the northwestern Laurentian margin. In this study...
Authors
Julie A. Dumoulin, Katherine J. Whidden, William A. Rouse, Christina A. DeVera
By
Energy Resources Program, Central Energy Resources Science Center, Geology, Energy & Minerals Science Center, Alaska Science Center
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