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This volume comprises the proceedings of a symposium on marine
mammal survey assessment methods, which took place in Seattle,
Washington, USA.
This study concerns the use of distance sampling to estimate the
density or abundance of biological populations. Line and point
transect sampling are the primary distance methods. Here, lines or
points are surveyed in the field and the observer records a
distance to those objects of interest that are detected. The sample
data are the set of distances of detected objects and any relevant
covariates; however, many objects may remain undetected during the
course of the survey. Distance sampling provides a way to obtain
reliable estimates of density of objects under fairly mild
assumptions. Distance sampling is an extension of plot sampling
methods where it is assumed that all objects within sample plots
are counted. The objective of this book is to provide a
comprehensive treatment of distance sampling theory and
application. It covers the theory and application of distance
sampling with emphasis on line and point transects. Specialized
applications are noted briefly, such as trapping webs and cue
counts. General considerations are given to the design of distance
sampling surveys.
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