Journal article

Efficient effort allocation in line-transect distance sampling of high-density species: When to walk further, measure less-often and gain precision

Kathryn Knights, Michael A McCarthy, James Camac, Gurutzeta Guillera-Arroita

METHODS IN ECOLOGY AND EVOLUTION | WILEY | Published : 2021

Abstract

Line-transect distance sampling is widely used to estimate population densities using distances of observed targets from transect lines to model detectability. When the target taxa are high density, the frequent measuring of distances may make the method seem impractical. We present a method that improves the efficiency of distance sampling when the target species occurs at high density. Only a proportion of targets are measured to model the detection function, and the time saved on the survey is then used to cover a longer total length of transect and accrue a larger ‘count only’ sample. This approach can improve the precision of the population density estimate when the cost of measuring th..

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