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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: 6158
Nonindigenous species Nonindigenous species
No abstract available.
Authors
R.A. Orr, G. McClung, R. Peoples, J.D. Williams
On the importance of controlling for effort in analysis of count survey data: Modeling population change from Christmas Bird Count data On the importance of controlling for effort in analysis of count survey data: Modeling population change from Christmas Bird Count data
Count survey data are commonly used for estimating temporal and spatial patterns of population change. Since count surveys are not censuses, counts can be influenced by 'nuisance factors' related to the probability of detecting animals but unrelated to the actual population size. The effects of systematic changes in these factors can be confounded with patterns of population change. Thus...
Authors
W.A. Link, J.R. Sauer
One Northwest community - People, salmon, rivers, and the sea: Towards sustainable salmon fisheries One Northwest community - People, salmon, rivers, and the sea: Towards sustainable salmon fisheries
Pacific salmon management is in crisis. Throughout their range, salmon and steelhead populations are being adversely affected by human activities. Without coordinated, effective, and timely action, the future of the Pacific salmon resource is most certainly in doubt. To address the challenges that are currently facing salmon management, concerned citizens representing a diverse array of...
Authors
Donald D. MacDonald, Cleveland R. Steward, E. Eric Knudsen
Organochlorine contaminants and Tree Swallows along the Fox River and Green Bay, Wisconsin, USA Organochlorine contaminants and Tree Swallows along the Fox River and Green Bay, Wisconsin, USA
Green Bay, Wisconsin is contaminated with polychlorinated biphenyls (PCBs) however, whether these contaminants affect reproduction in insectivorous birds is unknown. Tree Swallows, Tachycineta bicolor, are secondary cavity nesters that will nest in boxes and tolerate handling. Because Tree Swallows are aquatic insectivores, residues in their tissues are primarily indicative of...
Authors
Christine M. Custer, T. W. Custer, P. David Allen, K. L. Stromborg, M. J. Melancon
Population status of North American grassland birds from the North American Breeding Bird Survey Population status of North American grassland birds from the North American Breeding Bird Survey
We summarize population trends for grassland birds from 1966 to 1996 using data from the North American Breeding Bird Survey. Collectively, grassland birds showed the smallest percentage of species that increased of any Breeding Bird Survey bird group, and population declines prevailed throughout most of North America. Although 3 grassland bird species experienced significant population
Authors
B. Peterjohn, J.R. Sauer
Present and future of scientific bird ringing Present and future of scientific bird ringing
In 1999 scientific bird ringing will celebrate its first century of existence. Started mainly to investigate bird movements, bird ringing has become a much more flexible method to study different aspects of bird biology. Bird ringing can only be properly organised if an effective international co-operation exists. In Europe, this co-ordination is ensured by EURING, made of 35 national...
Authors
F. Spina, J. Tautin
Regional analysis of population trajectories from the North American Breeding Bird Survey Regional analysis of population trajectories from the North American Breeding Bird Survey
The North American Breeding Bird Survey (BBS) was started in 1966, and provides information on population change and distribution for most of the birds in North America. The geographic extent of the survey, and the logistical compromises needed to survey such a large area, present many challenges for estimation from BBS data. In this paper, we describe the survey and discuss some of the
Authors
J.R. Sauer, W.A. Link
Regional hydrology of the Dixie Valley geothermal field, Nevada: preliminary interpretations of chemical and isotopic data Regional hydrology of the Dixie Valley geothermal field, Nevada: preliminary interpretations of chemical and isotopic data
Chemical and isotopic analyses of Dixie Valley regional waters indicated several distinct groups ranging in recharge age from Pleistocene (1000a). Geothermal field fluids (~12-14 ka) appear derived from water similar in composition to non thermal groundwater observed today in valley artesian well (also ~14 ka). Geothermal fluid interaction with mafic rocks (Humboldt Lopolith) appears to...
Authors
Gregory Nimz, Cathy Janik, Fraser Goff, Charles Dunlap, Mark Huebner, Dale Counce, Stuart D. Johnson
Research: Materials and techniques Research: Materials and techniques
No abstract available.
Authors
R.W. McDiarmid, R. Altig
Runoff and erosion from a rapidly eroding pinyon-juniper hillslope Runoff and erosion from a rapidly eroding pinyon-juniper hillslope
No abstract available.
Authors
B.P. Wilcox, J. Pitlick, Craig D. Allen, David W. Davenport