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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.
Filter Total Items: 6173
Quantitative analysis of American woodcock nest and brood habitat Quantitative analysis of American woodcock nest and brood habitat
Sixteen nest and 19 brood sites of American woodcock (Philohela minoI) were examined in northern lower Michigan between 15 April and 15 June 1974 to determine habitat structure associated with these sites. Woodcock hens utilized young, second-growth forest stands which were similar in species composition for both nesting and brood rearing. A multi-varIate discriminant function analysis...
Authors
A. Bourgeois
Reproductive maturation and breeding of woodcock in North Carolina Reproductive maturation and breeding of woodcock in North Carolina
Breeding woodcock (PhiJohela minor) were studied in North Carolina during the winters and springs of 1974-75 and 1975-76.. Measurements of testes and ovaries from 19 male and 30 female woodcock suggest that gonadal recrudescence in many woodcock occurs on the wintering grounds. In males, testicular recrudescence occurred as early as December and was accompanied by territory selection and...
Authors
R.T. Stamps, P.D. Doerr
Reproductive success of Potomac River ospreys, 1971 Reproductive success of Potomac River ospreys, 1971
No abstract available.
Authors
Stanley N. Wiemeyer
Research, management, and status of the osprey in North America Research, management, and status of the osprey in North America
Osprey populations were studied throughout North America during the last decade as a result of dramatic declines reported along the North Atlantic Coast in the1950s and early 1960s. Researchers used banding, localized studies, aerial surveys, and pesticide analyses to identify factors influencing regional populations. Declining populations showed extremely poor production, contamination...
Authors
Charles J. Henny
Scent-marking in lone wolves and newly-formed pairs Scent-marking in lone wolves and newly-formed pairs
No abstract available.
Authors
R. Rothman, L.D. Mech
Suspended particle transport and circulation in San Francisco Bay - an overview Suspended particle transport and circulation in San Francisco Bay - an overview
Differences in the relative magnitude and timing of wind stress and river inflow in the northern and southern reaches of San Francisco Bay create different sedimentary conditions. The northern reach is a partially to well mixed estuary receiving most of the total annual fresh-water input (840 m3 sec−1) and suspended sediment input (4 × 106metric tons) into the bay; more than 80% of the...
Authors
T. J. Conomos, D. H. Peterson
The current status of woodcock and woodcock surveys in the United States The current status of woodcock and woodcock surveys in the United States
A comparison of American woodcock (Philohela minor) wing collection survey data for 1975-76 and 1976-77 showed that there was little change in the indices to breeding success and hunter success between years in the Atlantic and Central regions. The 1977 breeding population index was up 15.2 percent from 1976 in the Central region and static in the Atlantic region. There is a long-term...
Authors
J. Tautin
The study of chemical communication in free-ranging mammals The study of chemical communication in free-ranging mammals
No abstract available.
Authors
L.D. Mech, R.P. Peters
Woodcock utilization of commercial timberlands in the northeast Woodcock utilization of commercial timberlands in the northeast
This paper reports the results of studies in Maine (1975-77) and New Brunswick (1974) on the utilization of commercial timber areas by woodcock (Philohela minor). Openings created by logging operations were utilized for singing grounds and nocturnal roosting habitat. Singing male densities of 3.4 birds/1oo ha on were found on New Brunswick elearcuts, 0.24 birds/IOO ha on northern Maine...
Authors
C.P. Nicholson, S. Homer, Ray B. Owen, T.G. Dilworth
Interstitial waters of marine sediments Interstitial waters of marine sediments
No abstract available.
Authors
Frank T. Manheim