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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.
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Occurrence and preservation of Eocene squamariacean and coralline rhodoliths: Eau, Tonga
A widespread rhodolith facies occurs within middle Eocene limestones of Eua, Tonga (Fig. 1). These limestones, first described by Hoffmeister (1932), represent a portion of a broad, early Tertiary platform that developed in the Tonga area prior to disruption and uplift by later Tertiary plate movements (Kroenke and Tongilava 1975). Algal rhodoliths form beds several meters thick within Eocene lime
Authors
Binyamin Buchbinder, Robert B. Halley
Organochlorine pesticides in plasma of migrating peregrine falcons at Padre Island, Texas, Spring 1978-80 vs. Spring 1984
A spring concentration of migrating Peregrine Falcons (Falco peregrinus) was first discovered at Padre Island, Texas, in April 1978. The birds were first captured and blood-sampled for monitoring residue burdens and trends in the late 1970' s. Only 29 Peregrines were sampled in 1978 and 1979, but 111 were sampled in 1980. The initial investigation showed that DDE in the plasma of spring migrants r
Authors
C. J. Henny, K.E. Riddle, C.S. Hulse
Population trends of selected forest birds in the Northeast
No abstract available.
Authors
C.S. Robbins
Pre-nesting cooperation in birds: another form of helping behavior
No abstract available.
Authors
M.S. Foster
Productivity, pesticides, and management of the Peregrine Falcon in Arizona
In the decade since research commenced with the Peregrine in Arizona, over 60 sites have been identified which historically or presently are occupied by breeding pairs. Productivity was determined for about 120 breeding attempts from 1975-85. Almost all sites, for which productivity information is available for two or more years, have hatched young. Average values for fledging success were ca. 1.4
Authors
D. H. Ellis
Recent changes in the ranges of North American birds
The North American Breeding Bird Survey has provided an annual index of population change since 1966. About 2400 randomly distributed roadside routes of 50 three-minute stops each provide the basic data for computer analysis. One of the reports produced shows the percentage of routes on which each species is encountered in each state and each Canadian province. This percentage is used to show expa
Authors
C.S. Robbins
Sea otters and shellfisheries
No abstract available at this time
Authors
J. A. Estes, G.R. VanBlaricom
Seasonal and interannual nutrient variability in northern San Francisco Bay
No abstract available.
Authors
R. E. Smith, D.H. Peterson, S.W. Hager, D.D. Harmon, L. E. Schemel, R.E. Herndon
Status and conservation of forest raptors in the West Indies
No abstract available.
Authors
J. W. Wiley