William Link, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 44
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Filter Total Items: 128
New approaches to the analysis of population trends in land birds: Comment New approaches to the analysis of population trends in land birds: Comment
James et al. (1996, Ecology 77:13-27) used data from the North American Breeding Bird Survey (BBS) to examine geographic variability in patterns of population change for 26 species of wood warblers. They emphasized the importance of evaluating nonlinear patterns of change in bird populations, proposed LOESS-based non-parametric and semi-parametric analyses of BBS data, and contrasted...
Authors
William A. Link, John R. Sauer
Estimation of population trajectories from count data Estimation of population trajectories from count data
Monitoring of changes in animal population size is rarely possible through complete censuses; frequently, the only feasible means of monitoring changes in population size is to use counts of animals obtained by skilled observers as indices to abundance. Analysis of changes in population size can be severely biased if factors related to the acquisition of data are not adequately...
Authors
W.A. Link, J.R. Sauer
Empirical Bayes estimation of proportions with application to cowbird parasitism rates Empirical Bayes estimation of proportions with application to cowbird parasitism rates
Bayesian models provide a structure for studying collections of parameters such are considered in the investigation of communities, ecosystems, and landscapes. This structure allows for improved estimation of individual parameters by considering them in the context of a group of related parameters. Individual estimates are differntially adjusted toward in overall mean, with the magnitude...
Authors
William A. Link, D. Caldwell Hahn
Extremes in ecology: Avoiding the misleading effects of sampling variation in summary analyses Extremes in ecology: Avoiding the misleading effects of sampling variation in summary analyses
Surveys such as the North American Breeding Bird Survey (BBS) produce large collections of parameter estimates. One's natural inclination when confronted with lists of parameter estimates is to look for the extreme values: in the BBS, these correspond to the species that appear to have the greatest changes in population size through time. Unfortunately, extreme estimates are liable to...
Authors
William A. Link, John R. Sauer
A resource conservative procedure for comparison of dose-response relationships A resource conservative procedure for comparison of dose-response relationships
The evaluation of effects of toxicants on a wildlife community can be complicated by varying responses among the community's constituent populations. Even within populations, considerable variability in dose-response relations may result from different avenues of exposure to the toxicant. Full-scale investigations of the dose-response relations among a variety of species and avenues of...
Authors
W.A. Link, E. F. Hill, J.E. Hines, P.F.P. Henry
Coexistence and community structure of tropical trees in a Hawaiian montane rain forest Coexistence and community structure of tropical trees in a Hawaiian montane rain forest
We measured the diameter at breast height of all trees and shrubs > 5 meters in height, including standing dead trees, on 68 0.04-hectare study plots in a montane, subtropical rain forest on Mauna Loa, Hawai`i. The canopy species consisted of 88 percent Metrosideros polymorpha (ohia) and 12 percent Acacia koa (koa). Negative associations were found between the densities of koa and ohia...
Authors
Jeff S. Hatfield, William A. Link, Deanna K. Dawson, E. L. Lindquist
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
New approaches to the analysis of population trends in land birds: Comment New approaches to the analysis of population trends in land birds: Comment
James et al. (1996, Ecology 77:13-27) used data from the North American Breeding Bird Survey (BBS) to examine geographic variability in patterns of population change for 26 species of wood warblers. They emphasized the importance of evaluating nonlinear patterns of change in bird populations, proposed LOESS-based non-parametric and semi-parametric analyses of BBS data, and contrasted...
Authors
William A. Link, John R. Sauer
Estimation of population trajectories from count data Estimation of population trajectories from count data
Monitoring of changes in animal population size is rarely possible through complete censuses; frequently, the only feasible means of monitoring changes in population size is to use counts of animals obtained by skilled observers as indices to abundance. Analysis of changes in population size can be severely biased if factors related to the acquisition of data are not adequately...
Authors
W.A. Link, J.R. Sauer
Empirical Bayes estimation of proportions with application to cowbird parasitism rates Empirical Bayes estimation of proportions with application to cowbird parasitism rates
Bayesian models provide a structure for studying collections of parameters such are considered in the investigation of communities, ecosystems, and landscapes. This structure allows for improved estimation of individual parameters by considering them in the context of a group of related parameters. Individual estimates are differntially adjusted toward in overall mean, with the magnitude...
Authors
William A. Link, D. Caldwell Hahn
Extremes in ecology: Avoiding the misleading effects of sampling variation in summary analyses Extremes in ecology: Avoiding the misleading effects of sampling variation in summary analyses
Surveys such as the North American Breeding Bird Survey (BBS) produce large collections of parameter estimates. One's natural inclination when confronted with lists of parameter estimates is to look for the extreme values: in the BBS, these correspond to the species that appear to have the greatest changes in population size through time. Unfortunately, extreme estimates are liable to...
Authors
William A. Link, John R. Sauer
A resource conservative procedure for comparison of dose-response relationships A resource conservative procedure for comparison of dose-response relationships
The evaluation of effects of toxicants on a wildlife community can be complicated by varying responses among the community's constituent populations. Even within populations, considerable variability in dose-response relations may result from different avenues of exposure to the toxicant. Full-scale investigations of the dose-response relations among a variety of species and avenues of...
Authors
W.A. Link, E. F. Hill, J.E. Hines, P.F.P. Henry
Coexistence and community structure of tropical trees in a Hawaiian montane rain forest Coexistence and community structure of tropical trees in a Hawaiian montane rain forest
We measured the diameter at breast height of all trees and shrubs > 5 meters in height, including standing dead trees, on 68 0.04-hectare study plots in a montane, subtropical rain forest on Mauna Loa, Hawai`i. The canopy species consisted of 88 percent Metrosideros polymorpha (ohia) and 12 percent Acacia koa (koa). Negative associations were found between the densities of koa and ohia...
Authors
Jeff S. Hatfield, William A. Link, Deanna K. Dawson, E. L. Lindquist