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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.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6071
Future climate: Projected average
No abstract available.
Authors
Daniel Cayan, Mary Tyree, Kenneth E. Kunkel, Chris Castro, Alexander Gershunov, Joseph Barsugli, Andrea Ray, Jonathan Overpeck, Michael Anderson, Joellen Russell, Balaji Rajagopalan, Imtiaz Rangwala, Phil Duffy
Geochemistry and geophysics field maps used during the USGS 2011 field season in southwest Alaska
The US Geological Survey (USGS) has been studying a variety of geochemical and geophyscial assessment techniques for concealed mineral deposits. The 2011 field season for this project took place in southwest Alaska, northeast of Bristol Bay between Dillingham and Iliamna Lake. Four maps were created for the geochemistry and geophysics teams to use during field activities.
Authors
Stuart A. Giles
Geophysical constraints on Rio Grande rift structure and stratigraphy from magnetotelluric models and borehole resistivity logs, northern New Mexico
Two- and three-dimensional electrical resistivity models derived from the magnetotelluric method were interpreted to provide more accurate hydrogeologic parameters for the Albuquerque and Española Basins. Analysis and interpretation of the resistivity models are aided by regional borehole resistivity data. Examination of the magnetotelluric response of hypothetical stratigraphic cases using resist
Authors
Brian D. Rodriguez, David A. Sawyer
Global climate change impacts on coastal ecosystems in the Gulf of Mexico: Considerations for integrated coastal management
Global climate change is important in considerations of integrated coastal management in the Gulf of Mexico. This is true for a number of reasons. Climate in the Gulf spans the range from tropical to the lower part of the temperate zone. Thus, as climate warms, the tropical temperate interface, which is currently mostly offshore in the Gulf of Mexico, will increasingly move over the coastal zone o
Authors
John W. Day, Alejandro Yanez-Arancibia, James H. Cowan, Richard H. Day, Robert R. Twilley, John R. Rybczyk
Hormonal control of euryhalinity
Hormones play a critical role in maintaining body fluid balance in euryhaline fishes during changes in environmental salinity. The neuroendocrine axis senses osmotic and ionic changes, then signals and coordinates tissue-specific responses to regulate water and ion fluxes. Rapid-acting hormones, e.g. angiotensins, cope with immediate challenges by controlling drinking rate and the activity of ion
Authors
Yoshio Takei, Stephen D. McCormick
Impacts of land-use change to ecosystem services
Increasing human populations on the landscape and globe coincide with increasing demands for food, energy, and other natural resources, with generally negative impacts to wildlife habitat, air and water quality, and natural scenery. Here we define and describe the impacts of land-use change on ecosystem services – the services that ecosystems provide humans such as filtering air and water, providi
Authors
Tom Stohlgren, Tracy R. Holcombe
Integrating GIS across disciplines: how the intersection of biology and geography has influenced fisheries GIS
No abstract available.
Authors
William L. Fisher
Interactions among hydrogeomorphology, vegetation, and nutrient biogeochemistry in floodplain ecosystems
Hydrogeomorphic, vegetative, and biogeochemical processes interact in floodplains resulting in great complexity that provides opportunities to better understand linkages among physical and biological processes in ecosystems. Floodplains and their associated river systems are structured by four dimensional gradients of hydrogeomorphology: longitudinal, lateral, vertical, and temporal components. Th
Authors
G. B. Noe
Interactions among hydrogeomorphology, vegetation, and nutrient biogeochemistry in floodplain ecosystems
Hydrogeomorphic, vegetative, and biogeochemical processes interact in floodplains resulting in great complexity that provides opportunities to better understand linkages among physical and biological processes in ecosystems. Floodplains and their associated river systems are structured by four-dimensional gradients of hydrogeomorphology: longitudinal, lateral, vertical, and temporal components. Th
Authors
G. B. Noe
Introduction
The Mohave ground squirrel (Xerospermophilus mohavensis), named just over a century ago (Merriam 1889), is precinctive to the western Mojave Desert in California, USA, and occupies portions of Kern, Los Angeles, Inyo and San Bernardino counties (Best 1995). Early estimates of the geographic range of the squirrel are just 20,000 km2 in area (Hall 1981, Zeiner et al. 1988‐ 1990), one of the smallest
Authors
Todd C. Esque, Kenneth E. Nussear, Richard D. Inman, Marjorie D. Matocq, Peter J. Weisberg, Thomas E. Dilts, Philip Leitner
Introduction in New perspectives on Rio Grande rift basins: from tectonics to groundwater
Basins of the Rio Grande rift have long been studied both for their record of rift development and for their potential as host of natural resources. Early workers described the basin geomorphology and the character of infilling sediments (e.g. Siebenthal, 1910; Bryan, 1938; Speigel and Baldwin, 1963), and subsequent research compilations provided general stratigraphic and tectonic overviews of ri
Authors
Mark R. Hudson, V. J. S. Grauch
Laramide basin CSI: Comprehensive stratigraphic investigations of Paleogene sediments in the Colorado Headwaters Basin, north-central Colorado
The Paleogene sedimentary deposits of the Colorado Headwaters Basin provide a detailed proxy record of regional deformation and basin subsidence during the Laramide orogeny in north-central Colorado and southern Wyoming. This field trip presents extensive evidence from sedimentology, stratigraphy, structure, palynology, and isotope geochronology that shows a complex history that is markedly differ
Authors
Marieke Dechesne, James C. Cole, James H. Trexler, Patricia Cashman, Christopher D Peterson