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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 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.
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Feeding competition between larval lake whitefish and lake herring Feeding competition between larval lake whitefish and lake herring
The potential for competition for food between larval lake whitefish (Coregonus clupeaformis) and lake herring (C. artedi) 1- to 8-wk of age was explored in a series of 1-h laboratory feeding studies. Feeding started at 2-wk post-hatch. Learning and fish size appear to be more important than prey density at the onset of feeding. Species differed in their feeding behavior and consumption...
Authors
Jacqueline F. Savino, Patrick L. Hudson
Timing of emplacement of the Haypress Creek and Emigrant Gap plutons: Implications for the timing and controls of Jurassic orogenesis, northern Sierra Nevada, California Timing of emplacement of the Haypress Creek and Emigrant Gap plutons: Implications for the timing and controls of Jurassic orogenesis, northern Sierra Nevada, California
Pre-Cretaceous rocks in the northern Sierra Nevada are subdivided from west to east into the Smartville, central, Feather River peridotite, and eastern belts. Cretaceous and younger sedimentary rocks form the western boundary of the Smartville belt, but various reverse-fault segments of the Foothills fault system separate the other belts. The Foothills fault system and associated...
Authors
Gary H. Girty, Richard E. Hanson, Melissa S. Girty, Richard A. Schweickert, David S. Harwood, Aaron S. Yoshinobu, Kevin A. Bryan, June E. Skinner, Chris A. Hill
Bermuda solution pipe soils: A geochemical evaluation of eolian parent materials Bermuda solution pipe soils: A geochemical evaluation of eolian parent materials
No abstract available.
Authors
Stanley R. Herwitz, Daniel R. Muhs
The value of postaudits in groundwater model applications The value of postaudits in groundwater model applications
No abstract available.
Authors
Leonard F. Konikow
Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams
No abstract available.
Authors
James Constantz, G. Zellweger
Occurrence and distribution of pesticides in streams of the Midwestern United States Occurrence and distribution of pesticides in streams of the Midwestern United States
No abstract available.
Authors
D. A. Goolsby, William A. Battaglin
Isotope tracers on water and solute sources in catchments Isotope tracers on water and solute sources in catchments
No abstract available.
Authors
Carol Kendall, C. Sklash, Thomas D. Bullen
Transport of reacting solutes in rivers and streams Transport of reacting solutes in rivers and streams
In this chapter we discuss the major processes affecting solutes in rivers and streams. Here a solute is generally defined as any substance or entity that is transported downstream by the flowing waters. Under this definition, solutes may be pollutants, such as pesticides and hydrocarbons, or naturally occurring substances such as dissolved gases, nutrients, and trace elements. Study of...
Authors
Robert L. Runkel, Kenneth E. Bencala
Sea otters in the northern Pacific Ocean Sea otters in the northern Pacific Ocean
About 250 years ago sea otters (Enhydra lutris) were distributed continuously from central Baja California, north and west along the Pacific Rim to Machatka Peninsula in Russia, and south along the Kuril Island to northern Japan (Kenyon 1969; Fig. 1a). Several hundred thousand sea otters may have occurred in the north Pacific region when commercial hunting began in the 18th century...
Authors
James L. Bodkin, Ronald J. Jameson, James A. Estes
A capture-recapture survival analysis model for radio-tagged animals A capture-recapture survival analysis model for radio-tagged animals
In recent years, survival analysis of radio-tagged animals has developed using methods based on the Kaplan-Meier method used in medical and engineering applications (Pollock et al., 1989a,b). An important assumption of this approach is that all tagged animals with a functioning radio can be relocated at each sampling time with probability 1. This assumption may not always be reasonable...
Authors
K. H. Pollock, C.M. Bunck, Scott R. Winterstein, Chiu-Lan Chen
A landscape-level analysis of marbled murrelet habitat in western Washington A landscape-level analysis of marbled murrelet habitat in western Washington
No abstract available at this time
Authors
M.G. Raphael, J.A. Young, B.M. Galleher