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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
Patterns of egg deposition by lake trout and lake whitefish at Tawas artificial Reef, Lake Huron, 1990-1993 Patterns of egg deposition by lake trout and lake whitefish at Tawas artificial Reef, Lake Huron, 1990-1993
In August 1987, the Michigan Department of Natural Resources (MDNR), with the help and co-sponsorship of Walleyes for Iosco County, constructed Tawas artificial reef to improve recreational fishing in Tawas Bay. Post-construction assessment in October, 1987, by the MDNR found twice as many adult lake trout in a gill net set on the reef as in a similar net set off the reef, indicating...
Authors
N.R. Foster, G.W. Kennedy
Persistent environmental contaminants in fish and wildlife Persistent environmental contaminants in fish and wildlife
The publication of Silent Spring (Carson 1962) highlighted the potential for dichlorodiphenyl trichloroethane (DDT) and other pesticides that persist in the environment to accumulate in and to harm fish, wildlife, and the ecosystems upon which they depend. The federal government responded in the mid-1960's by establishing a multi-agency program to monitor the concentrations of pesticides...
Authors
C. J. Schmitt, C.M. Bunck
Petroleum and individual polycyclic aromatic hydrocarbons Petroleum and individual polycyclic aromatic hydrocarbons
Crude petroleum, refined-petroleum products, and individual polycyclic aromatic hydrocarbons (PAHs) contained within petroleum are found throughout the world. their presence has been detected in living and nonliving components of ecosystems. Petroleum can be an environmental hazard for wild animals and plants. Individual PAHs are also hazardous to wildlife, but they are most commonly...
Authors
Peter H. Albers
Population dynamics of neotropical migratory birds using agriculture-forest mosaics in Campeche, Mexico Population dynamics of neotropical migratory birds using agriculture-forest mosaics in Campeche, Mexico
In many areas of the tropics, forests are being converted to agriculture and other uses at a rapid rate. Previous research has documented that forest-breeding migratory birds are distributed across a wide variety of habitat types during midwinter. However, to evaluate the relative importance of different habitat types to wintering birds, we need to examine habitat-specific estimates of...
Authors
M.H. Wilson, M. Berlanga, D. Dawson, P. Wood, J. Sauer, C.S. Robbins
Population modeling and its role in toxicological studies Population modeling and its role in toxicological studies
A model could be defined as any abstraction from reality that is used to provide some insight into the real system. In this discussion, we will use a more specific definition that a model is a set of rules or assumptions, expressed as mathematical equations, that describe how animals survive and reproduce, including the external factors that affect these characteristics. A model...
Authors
John R. Sauer, Grey W. Pendleton
Population trends from the North American Breeding Bird Survey Population trends from the North American Breeding Bird Survey
INTRODUCTION: Most Neotropical migrant birds are difficult to count accurately and are moderately common over large breeding distributions. Consequently, little historical information exists on their large-scale population changes, and most of this information is anecdotal. Surveys begun in this century such as Breeding Bird Censuses and Christmas Bird Counts have the potential to...
Authors
B.G. Peterjohn, J.R. Sauer, C.S. Robbins
Population trends of the loggerhead shrike from the North American Breeding Bird Survey Population trends of the loggerhead shrike from the North American Breeding Bird Survey
North American Breeding Bird Survey data indicated a general decline in Loggerhead Shrike (Lanius ludovicianus) populations during 1966-1993. At the continental level, shrikes declined at an average rate of 2.9% per year. Average rates of regional declines varied from 2.5-3.4% annually. These declines were prevalent in most states, provinces, and physiographic strata. Only the Edwards...
Authors
B.G. Peterjohn, J.R. Sauer
Preparing a soil carbon inventory for the United States using geographic information systems Preparing a soil carbon inventory for the United States using geographic information systems
No abstract available.
Authors
N.B. Bliss, S.W. Waltman, G.W. Petersen
Production of striped bass and other North American sports fish Production of striped bass and other North American sports fish
No abstract available at this time
Authors
J.H. Kerby, C.E. Nash
Productivity of saker falcons (Falco cherrug) in Mongolia Productivity of saker falcons (Falco cherrug) in Mongolia
During the summers 1994-1995, over 80 eyries were located on over 10,000 km of survey routes in Mongolia. Where possible, production and hatch dates were assessed when the eyries were found. For 75 nesting attempts, breeding success was found to be 92%. The average number of young per brood was 28 for 68 attempts. The number of young fledged per pair by year were 3.2 in 1994 and 2.6 in...
Authors
D. H. Ellis, Merlin H. Ellis, Pu Tsengeg