William Link, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
Effects of methyl mercury on reproduction in American kestrels Effects of methyl mercury on reproduction in American kestrels
Methyl mercury (MeHg) readily passes through biological membranes, accumulates in individuals, and biomagnifies in higher order predators. It is acutely toxic to some birds at 5-15 parts per million (ppm) wet weight in the diet, and it can damage the central nervous system, impair reproduction, and retard growth and development. The effects of MeHg on reproduction in wild raptors are...
Authors
P.H. Albers, M.T. Koterba, R. Rossmann, J.B. French, R.S. Bennett, W.C. Bauer, W.A. Link
Hierarchical models and Bayesian analysis of bird survey information Hierarchical models and Bayesian analysis of bird survey information
Summary of bird survey information is a critical component of conservation activities, but often our summaries rely on statistical methods that do not accommodate the limitations of the information. Prioritization of species requires ranking and analysis of species by magnitude of population trend, but often magnitude of trend is a misleading measure of actual decline when trend is...
Authors
J.R. Sauer, W.A. Link, J. Andrew Royle
Nonlinearity and seasonal bias in an index of brushtail possum abundance Nonlinearity and seasonal bias in an index of brushtail possum abundance
Introduced brushtail possums (Trichosurus vulpecula) are a widespread pest of conservation and agriculture in New Zealand, and considerable effort has been expended controlling populations to low densities. A national protocol for monitoring the abundance of possums, termed trap catch index (TCI), was adopted in 1996. The TCI requires that lines of leghold traps set at 20-m spacing are...
Authors
David M. Forsyth, William A. Link, R. Webster, G. Nugent, B. Warburton
Modeling association among demographic parameters in analysis of open population capture-recapture data Modeling association among demographic parameters in analysis of open population capture-recapture data
We present a hierarchical extension of the Cormack–Jolly–Seber (CJS) model for open population capture–recapture data. In addition to recaptures of marked animals, we model first captures of animals and losses on capture. The parameter set includes capture probabilities, survival rates, and birth rates. The survival rates and birth rates are treated as a random sample from a bivariate...
Authors
William A. Link, Richard J. Barker
A general class of multinomial mixture models for anuran calling survey data A general class of multinomial mixture models for anuran calling survey data
We propose a general framework for modeling anuran abundance using data collected from commonly used calling surveys. The data generated from calling surveys are indices of calling intensity (vocalization of males) that do not have a precise link to actual population size and are sensitive to factors that influence anuran behavior. We formulate a model for calling-index data in terms of...
Authors
J. Andrew Royle, William A. Link
Using the North American Breeding Bird Survey as a tool for conservation: A critique of Bart et al. (2004) Using the North American Breeding Bird Survey as a tool for conservation: A critique of Bart et al. (2004)
Bart et al. (2004) develop methods for predicting needed samples for estimation of long-term trends from Count survey data, and they apply these methods to the North American Breeding Bird Survey (BBS). They recommend adding approximately 40% more survey routes ill the BBS to allow for estimation of long-term (i.e., 20 year) trends for a collection of species. We critique several aspects...
Authors
John R. Sauer, William A. Link, James D. Nichols, J. Andrew Royle
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
Effects of methyl mercury on reproduction in American kestrels Effects of methyl mercury on reproduction in American kestrels
Methyl mercury (MeHg) readily passes through biological membranes, accumulates in individuals, and biomagnifies in higher order predators. It is acutely toxic to some birds at 5-15 parts per million (ppm) wet weight in the diet, and it can damage the central nervous system, impair reproduction, and retard growth and development. The effects of MeHg on reproduction in wild raptors are...
Authors
P.H. Albers, M.T. Koterba, R. Rossmann, J.B. French, R.S. Bennett, W.C. Bauer, W.A. Link
Hierarchical models and Bayesian analysis of bird survey information Hierarchical models and Bayesian analysis of bird survey information
Summary of bird survey information is a critical component of conservation activities, but often our summaries rely on statistical methods that do not accommodate the limitations of the information. Prioritization of species requires ranking and analysis of species by magnitude of population trend, but often magnitude of trend is a misleading measure of actual decline when trend is...
Authors
J.R. Sauer, W.A. Link, J. Andrew Royle
Nonlinearity and seasonal bias in an index of brushtail possum abundance Nonlinearity and seasonal bias in an index of brushtail possum abundance
Introduced brushtail possums (Trichosurus vulpecula) are a widespread pest of conservation and agriculture in New Zealand, and considerable effort has been expended controlling populations to low densities. A national protocol for monitoring the abundance of possums, termed trap catch index (TCI), was adopted in 1996. The TCI requires that lines of leghold traps set at 20-m spacing are...
Authors
David M. Forsyth, William A. Link, R. Webster, G. Nugent, B. Warburton
Modeling association among demographic parameters in analysis of open population capture-recapture data Modeling association among demographic parameters in analysis of open population capture-recapture data
We present a hierarchical extension of the Cormack–Jolly–Seber (CJS) model for open population capture–recapture data. In addition to recaptures of marked animals, we model first captures of animals and losses on capture. The parameter set includes capture probabilities, survival rates, and birth rates. The survival rates and birth rates are treated as a random sample from a bivariate...
Authors
William A. Link, Richard J. Barker
A general class of multinomial mixture models for anuran calling survey data A general class of multinomial mixture models for anuran calling survey data
We propose a general framework for modeling anuran abundance using data collected from commonly used calling surveys. The data generated from calling surveys are indices of calling intensity (vocalization of males) that do not have a precise link to actual population size and are sensitive to factors that influence anuran behavior. We formulate a model for calling-index data in terms of...
Authors
J. Andrew Royle, William A. Link
Using the North American Breeding Bird Survey as a tool for conservation: A critique of Bart et al. (2004) Using the North American Breeding Bird Survey as a tool for conservation: A critique of Bart et al. (2004)
Bart et al. (2004) develop methods for predicting needed samples for estimation of long-term trends from Count survey data, and they apply these methods to the North American Breeding Bird Survey (BBS). They recommend adding approximately 40% more survey routes ill the BBS to allow for estimation of long-term (i.e., 20 year) trends for a collection of species. We critique several aspects...
Authors
John R. Sauer, William A. Link, James D. Nichols, J. Andrew Royle