Book Chapters
Science Quality and Integrity
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: 6158
Population manipulations Population manipulations
Abstract not supplied at this time
Authors
C.K. Dodd
Population trends of North American sea ducks as revealed by the Christmas Bird Count Population trends of North American sea ducks as revealed by the Christmas Bird Count
Relative to other waterfowl, sea ducks are not well understood, yet evidence from a variety of analyses suggests that as many as 10 of the 15 species of North American sea ducks may be declining in population. However, because of the difficulty of conducting surveys of breeding populations and the lack of range-wide winter surveys, few data are available to assess the population trends...
Authors
D.K. Niven, J.R. Sauer, G.S. Butcher
Population trends of North American sea ducks based on Christmas Bird Count and Breeding Bird Survey data Population trends of North American sea ducks based on Christmas Bird Count and Breeding Bird Survey data
Due to the difficulty of conducting range-wide surveys of either breeding or wintering populations, few data are available to assess the population trends of sea ducks with confidence. We analyze sea duck data from the Audubon Christmas Bird Count (CBC) using hierarchical modeling methods that control for varying effort among circles and over time. These procedures allow us to assess...
Authors
D.K. Niven, J.R. Sauer, G.S. Butcher
Predicting bird response to alternative management scenarios on a ranch in Campeche, Mexico Predicting bird response to alternative management scenarios on a ranch in Campeche, Mexico
We developed models to predict the potential response of wintering Neotropical migrant and resident bird species to alternative management scenarios, using data from point counts of birds along with habitat variables measured or estimated from remotely sensed data in a Geographic Information System. Expected numbers of occurrences at points were calculated for 100 species of birds, under...
Authors
P.A. Wood, D.K. Dawson, J.R. Sauer, M.H. Wilson
Protecting visitor health in beach waters of Lake Michigan: problems and opportunities Protecting visitor health in beach waters of Lake Michigan: problems and opportunities
In this paper, we will review past research on Escherichia coli (E. Coli) and its relationship to recreational waters. Further, we will discuss current monitoring research and future prospects for improving monitoring efficiency to protect the health of beachgoers.
Authors
Meredith B. Nevers, Richard L. Whitman
Pseudacris crucifer Wied-Neuwid, 1838: spring peeper Pseudacris crucifer Wied-Neuwid, 1838: spring peeper
No abstract available.
Authors
B. P. Butterfield, M.J. Lannoo, P. Nanjappa
Rana boylii Baird 1854, Foothill Yellow-legged Frog Rana boylii Baird 1854, Foothill Yellow-legged Frog
No abstract available at this time
Authors
Gary M. Fellers
Rana draytonii Baird and Girard 1852, California Red-legged Frog Rana draytonii Baird and Girard 1852, California Red-legged Frog
No abstract available at this time
Authors
Gary M. Fellers
Rana muscosa Camp 1917, Mountain Yellow-legged Frog Rana muscosa Camp 1917, Mountain Yellow-legged Frog
No abstract available at this time
Authors
Vance Vredenburg, Gary M. Fellers, Carlos Davidson
Rana sphenocephala Cope, 1886: southern leopard frog Rana sphenocephala Cope, 1886: southern leopard frog
No abstract available.
Authors
B. P. Butterfield, M.J. Lannoo, P. Nanjappa
Recent research on the Chesapeake Bay impact structure, USA - Impact debris and reworked ejecta Recent research on the Chesapeake Bay impact structure, USA - Impact debris and reworked ejecta
Four new coreholes in the western annular trough of the buried, late Eocene Chesapeake Bay impact structure provide samples of shocked minerals, cataclastic rocks, possible impact melt, mixed sediments, and damaged microfossils. Parautochthonous Cretaceous sediments show an upward increase in collapse, sand fluidization, and mixed sediment injections. These impact-modified sediments are...
Authors
J. Wright Horton, John N. Aleinikoff, Michael J. Kunk, Gregory S. Gohn, Lucy E. Edwards, Jean M. Self-Trail, David S. Powars, Glen A. Izett
Red Hills salamander. Phaeognathus hubrichti Highton, 1961 Red Hills salamander. Phaeognathus hubrichti Highton, 1961
Abstract not supplied at this time
Authors
C.K. Dodd