Publications
These publications showcase the significant science conducted in our Science Centers.
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Hierarchial mark-recapture models: a framework for inference about demographic processes
The development of sophisticated mark-recapture models over the last four decades has provided fundamental tools for the study of wildlife populations, allowing reliable inference about population sizes and demographic rates based on clearly formulated models for the sampling processes. Mark-recapture models are now routinely described by large numbers of parameters. These large models provide the
Authors
W. A. Link, R. J. Barker
Abundance estimation and conservation biology
Abundance is the state variable of interest in most population–level ecological research and in most programs involving management and conservation of animal populations. Abundance is the single parameter of interest in capture–recapture models for closed populations (e.g., Darroch, 1958; Otis et al., 1978; Chao, 2001). The initial capture–recapture models developed for partially (Darroch, 1959) a
Authors
J. D. Nichols, D.I. MacKenzie
Costs of detection bias in index-based population monitoring
Managers of wildlife populations commonly rely on indirect, count-based measures of the population in making decisions regarding conservation, harvest, or control. The main appeal in the use of such counts is their low material expense compared to methods that directly measure the population. However, their correct use rests on the rarely-tested but often-assumed premise that they proportionately
Authors
C. T. Moore, W. L. Kendall
DENSITY: software for analysing capture-recapture data from passive detector arrays
A general computer-intensive method is described for fitting spatial detection functions to capture-recapture data from arrays of passive detectors such as live traps and mist nets. The method is used to estimate the population density of 10 species of breeding birds sampled by mist-netting in deciduous forest at Patuxent Research Refuge, Laurel, Maryland, U.S.A., from 1961 to 1972. Total densit
Authors
M.G. Efford, D.K. Dawson, C.S. Robbins
Evolution of quantitative methods for the study and management of avian populations: on the importance of individual contributions
The EURING meetings and the scientists who have attended them have contributed substantially to the growth of knowledge in the field of estimating parameters of animal populations. The contributions of David R. Anderson to process modeling, parameter estimation and decision analysis are briefly reviewed. Metrics are considered for assessing individual contributions to a field of inquiry, and it is
Authors
J. D. Nichols
Computing and software
The reality is that the statistical methods used for analysis of data depend upon the availability of software. Analysis of marked animal data is no different than the rest of the statistical field. The methods used for analysis are those that are available in reliable software packages. Thus, the critical importance of having reliable, up–to–date software available to biologists is obvious. Stati
Authors
Gary C. White, J. E. Hines
Generalized estimators of avian abundance from count survey data
I consider modeling avian abundance from spatially referenced bird count data collected according to common protocols such as capture?recapture, multiple observer, removal sampling and simple point counts. Small sample sizes and large numbers of parameters have motivated many analyses that disregard the spatial indexing of the data, and thus do not provide an adequate treatment of spatial structu
Authors
J. Andrew Royle
Blake Plateau basin extension: combined crustal thinning and dike intrusion
No abstract available.
Authors
F.K.A. McKinney, B. Ann Swift, D. S. Sawyer, K.M. Kent, William P. Dillon
Water resources data, Ohio, water year 2003 : Volume 1. Ohio River basin excluding project data
Water-resources data for the 2003 water year for Ohio consist of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; and water levels and water quality of ground-water wells. This report, in two volumes, contains records for water discharge at 138 gaging stations and various partial-record sites; water levels at 217 observation wells and 35 crest-
Authors
H.L. Shindel, J.P. Mangus, S.R. Frum
The 1974 Iceland Glaciological Society spring expedition to Vatnajokull
From 25 May to 3 June 1974, the Iceland Glaciological Research Society undertook an expedition to the western and northern parts of Vatnajökull. Fourteen members of the expedition, led by Gunnar Guðmundsson and Carl Eiríksson, traveled over the surface of the ice cap from Jökulheimar at the margin of Tungnárjökull to Grímsfjall (Svíahnúkur eystri). Subsequently, the expedition traveled from Grímsf
Authors
Richard S. Williams, Magnús Már Magnússon
Effects of Abandoned Coal-Mine Drainage on Streamflow and Water Quality in the Mahanoy Creek Basin, Schuylkill, Columbia, and Northumberland Counties, Pennsylvania, 2001
This report assesses the contaminant loading, effects to receiving streams, and possible remedial alternatives for abandoned mine drainage (AMD) within the Mahanoy Creek Basin in east-central Pennsylvania. The Mahanoy Creek Basin encompasses an area of 157 square miles (407 square kilometers) including approximately 42 square miles (109 square kilometers) underlain by the Western Middle Anthracite
Authors
Charles A. Cravotta
Biomonitoring of Environmental Status and Trends (BEST) Program: Environmental contaminants and their effects on fish in the Yukon River Basin
This project collected, examined, and analyzed 217 fish representing three species at 10 stations in the U.S. portion of the Yukon River Basin (YRB) from May to October 2002. Four sampling sites were located on the Yukon River; two were located on the Porcupine River, and one site was on each of the Ray, Tanana, Tolavana, and Innoko Rivers. Norther pike (Esox lucius), longnose sucker (Catostomus c
Authors
Jo Ellen Hinck, Timothy M. Bartish, Vicki Blazer, Nancy D. Denslow, Tim S. Gross, Mark S. Myers, Patrick J. Anderson, Carl E. Orazio, Donald E. Tillitt