Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16782
Development of computational fluid dynamics--habitat suitability (CFD-HSI) models to identify potential passage--Challenge zones for migratory fishes in the Penobscot River
A two-dimensional computational fluid dynamics-habitat suitability (CFD–HSI) model was developed to identify potential zones of shallow depth and high water velocity that may present passage challenges for five anadromous fish species in the Penobscot River, Maine, upstream from two existing dams and as a result of the proposed future removal of the dams. Potential depth-challenge zones were predi
Authors
Alexander J. Haro, Robert W. Dudley, Michael Chelminski
Arc-related porphyry molybdenum deposit model
This report provides a descriptive model for arc-related porphyry molybdenum deposits. Presented within are geological, geochemical, and mineralogical characteristics that differentiate this deposit type from porphyry copper and alkali-feldspar rhyolite-granite porphyry molybdenum deposits. The U.S. Geological Survey's effort to update existing mineral deposit models spurred this research, which i
Authors
Ryan D. Taylor, Jane M. Hammarstrom, Nadine M. Piatak, Robert R. Seal
Effects of urban stormwater-management strategies on stream-water quantity and quality
Urbanization results in elevated stormwater runoff, greater and more intense streamflow, and increased delivery of pollutants to local streams and downstream aquatic systems such as the Chesapeake Bay. Stormwater Best Management Practices (BMPs) are used to mitigate these effects of urban land use by retaining large volumes of stormwater runoff (water quantity) and removing pollutants in the runof
Authors
J.V. Loperfido, Dianna M. Hogan
Identification of functionally active aerobic methanotrophs in sediments from an arctic lake using stable isotope probing
Arctic lakes are a significant source of the greenhouse gas methane (CH4), but the role that methane oxidizing bacteria (methanotrophs) play in limiting the overall CH4 flux is poorly understood. Here, we used stable isotope probing (SIP) techniques to identify the metabolically active aerobic methanotrophs in upper sediments (0–1 cm) from an arctic lake in northern Alaska sampled during ice-free
Authors
Ruo He, Matthew J. Wooller, John W. Pohlman, Catharine Catranis, John Quensen, James M. Tiedje, Mary Beth Leigh
Apalachicola Bay interpreted seismic horizons and updated IRIS chirp seismic-reflection data
Apalachicola Bay and St. George Sound contain the largest oyster fishery in Florida, and the growth and distribution of the numerous oyster reefs here are the combined product of modern estuarine conditions and the late Holocene evolution of the bay. A suite of geophysical data and cores were collected during a cooperative study by the U.S. Geological Survey, the National Oceanic and Atmospheric A
Authors
V.A. Cross, D. C. Twichell, D. S. Foster, T. F. O'Brien
Biodiversity of man-made open habitats in an underused country: a class of multispecies abundance models for count data
Since the 1960s, Japan has become highly dependent on foreign countries for natural resources, and the amount of managed lands (e.g. coppice, grassland, and agricultural field) has declined. Due to infrequent natural and human disturbance, early-successional species are now declining in Japan. Here we surveyed bees, birds, and plants in four human-disturbed open habitats (pasture, meadow, young pl
Authors
Yuichi Yamaura, J. Andrew Royle, Naoaki Shimada, Seigo Asanuma, Tamotsu Sato, Hisatomo Taki, Shun'ichi Makino
Preliminary checklist of amphibians and reptiles from Baramita, Guyana
We provide an initial checklist of the herpetofauna of Baramita, a lowland rainforest site in the Northwest Region of Guyana. Twenty-five amphibian and 28 reptile species were collected during two separate dry-season visits. New country records for two species of snakes are documented, contributing to the knowledge on the incompletely known herpetofauna of Guyana.
Authors
R.P. Reynolds, R.D. MacCulloch
Amphibians and Reptiles from Paramakatoi and Kato, Guyana
We report the herpetofauna of two neighboring upland locations in west-central Guyana. Twenty amphibian and 24 reptile species were collected. Only 40% of amphibians and 12.5% of reptiles were collected in both locations. This is one of the few collections made at upland (750-800 m) locations in the Guiana Shield.
Authors
Ross D. MacCulloch, Robert P. Reynolds
Population size of snowy plovers breeding in North America
Snowy Plovers (Charadrius nivosus) may be one of the rarest shorebirds in North America yet a comprehensive assessment of their abundance and distribution has not been completed. During 2007 and 2008, 557 discrete wetlands were surveyed and nine additional large wetland complexes sampled in México and the USA. From these surveys, a population of 23,555 (95% CI = 17,299 – 29,859) breeding Snowy Plo
Authors
Susan M. Thomas, James E. Lyons, Brad A. Andres, Elise Elliot T-Smith, Eduardo Palacios, John F. Cavitt, J. Andrew Royle, Suzanne D. Fellows, Kendra Maty, William H. Howe, Eric Mellink, Stefani Melvin, Tara Zimmerman
Studying biodiversity: is a new paradigm really needed?
Authors in this journal have recommended a new approach to the conduct of biodiversity science. This data-driven approach requires the organization of large amounts of ecological data, analysis of these data to discover complex patterns, and subsequent development of hypotheses corresponding to detected patterns. This proposed new approach has been contrasted with more-traditional knowledge-based
Authors
James D. Nichols, Evan G. Cooch, Jonathan M. Nichols, John R. Sauer
Use of flow-normalization to evaluate nutrient concentration and flux changes in Lake Champlain tributaries, 1990-2009
The U.S. Geological Survey evaluated 20 years of total phosphorus (P) and total nitrogen (N) concentration data for 18 Lake Champlain tributaries using a new statistical method based on weighted regressions to estimate daily concentration and flux histories based on discharge, season, and trend as explanatory variables. The use of all the streamflow discharge values for a given date in the record,
Authors
Laura Medalie, Robert M. Hirsch, Stacey A. Archfield
Plate interaction in the NE Caribbean subduction zone from continuous GPS observations
Kinematic similarities between the Sumatra and Puerto Rico Trenches highlight the potential for a mega-earthquake along the Puerto Rico Trench and the generation of local and trans-Atlantic tsunamis. We used the horizontal components of continuous GPS (cGPS) measurements from 10 sites on NE Caribbean islands to evaluate strain accumulation along the North American (NA) - Caribbean (CA) plate bound
Authors
Uri S. ten Brink, Alberto M. Lopez-Vegas