William Link, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 44
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Filter Total Items: 128
Quantifying production of salmon fry in an unscreened irrigation system: A case study on the Rangitata River, New Zealand Quantifying production of salmon fry in an unscreened irrigation system: A case study on the Rangitata River, New Zealand
Diversion of out-migrant juvenile salmon into unscreened irrigation and hydroelectric canals is thought to have contributed significantly to declining populations of anadromous salmonids in the Pacific Northwest but is seldom studied in detail. Here we describe a program to study the fate of Chinook salmon Oncorhynchus tshawytscha fry diverted into the unscreened Rangitata Diversion Race...
Authors
M. J. Unwin, M. Webb, R. J. Barker, William A. Link
Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest
No abstract available.
Authors
D.K. Niven, J.R. Sauer, G.S. Butcher, W.A. Link
Estimating population trends with a linear model: Technical comments Estimating population trends with a linear model: Technical comments
Controversy has sometimes arisen over whether there is a need to accommodate the limitations of survey design in estimating population change from the count data collected in bird surveys. Analyses of surveys such as the North American Breeding Bird Survey (BBS) can be quite complex; it is natural to ask if the complexity is necessary, or whether the statisticians have run amok. Bart et...
Authors
John R. Sauer, William A. Link, J. Andrew Royle
Statistical analyses make the Christmas Bird Count relevant for conservation Statistical analyses make the Christmas Bird Count relevant for conservation
No abstract available.
Authors
J.R. Sauer, W.A. Link, D.K. Niven
Some consequences of using counts of birds banded as indices to populations Some consequences of using counts of birds banded as indices to populations
In mist-net studies, it is often difficult to use capture-recapture methods to estimate number of birds present. Many investigators use number of birds captured as an index of population size. We investigate the consequences of using indices of bird abundance as surrogates for population size in hypothesis tests. Unless all of the birds present are captured, indices are biased estimates...
Authors
J.R. Sauer, W.A. Link
Hierarchial mark-recapture models: a framework for inference about demographic processes 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...
Authors
W.A. Link, R. J. Barker
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
Quantifying production of salmon fry in an unscreened irrigation system: A case study on the Rangitata River, New Zealand Quantifying production of salmon fry in an unscreened irrigation system: A case study on the Rangitata River, New Zealand
Diversion of out-migrant juvenile salmon into unscreened irrigation and hydroelectric canals is thought to have contributed significantly to declining populations of anadromous salmonids in the Pacific Northwest but is seldom studied in detail. Here we describe a program to study the fate of Chinook salmon Oncorhynchus tshawytscha fry diverted into the unscreened Rangitata Diversion Race...
Authors
M. J. Unwin, M. Webb, R. J. Barker, William A. Link
Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest
No abstract available.
Authors
D.K. Niven, J.R. Sauer, G.S. Butcher, W.A. Link
Estimating population trends with a linear model: Technical comments Estimating population trends with a linear model: Technical comments
Controversy has sometimes arisen over whether there is a need to accommodate the limitations of survey design in estimating population change from the count data collected in bird surveys. Analyses of surveys such as the North American Breeding Bird Survey (BBS) can be quite complex; it is natural to ask if the complexity is necessary, or whether the statisticians have run amok. Bart et...
Authors
John R. Sauer, William A. Link, J. Andrew Royle
Statistical analyses make the Christmas Bird Count relevant for conservation Statistical analyses make the Christmas Bird Count relevant for conservation
No abstract available.
Authors
J.R. Sauer, W.A. Link, D.K. Niven
Some consequences of using counts of birds banded as indices to populations Some consequences of using counts of birds banded as indices to populations
In mist-net studies, it is often difficult to use capture-recapture methods to estimate number of birds present. Many investigators use number of birds captured as an index of population size. We investigate the consequences of using indices of bird abundance as surrogates for population size in hypothesis tests. Unless all of the birds present are captured, indices are biased estimates...
Authors
J.R. Sauer, W.A. Link
Hierarchial mark-recapture models: a framework for inference about demographic processes 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...
Authors
W.A. Link, R. J. Barker