Journal article

Field trials and simulations of point-nearest-neighbor distance methods for estimating abalone density

R Mcgarvey, K Byth, CD Dixon, RW Day, JE Feenstra

JOURNAL OF SHELLFISH RESEARCH | NATL SHELLFISHERIES ASSOC | Published : 2005

Abstract

We investigated evidence for bias in estimates of abalone density from the point-nearest-neighbor (PNN) diver survey method wherein divers measure distances between abalone and from random points to nearest abalone. Field and simulation tests of the PNN survey method were undertaken. In two plots of a lightly exploited abalone population in South Australia, all the greenlip abalone (Haliotis laevigata Donovan) were enumerated by divers, providing the true density in both study regions. Clustering of abalone was visually evident and quantified by a Hopkins test. The study areas were gridded into 1-m 2 quadrats. Divers measured distances from randomly selected grid points to the nearest abalon..

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University of Melbourne Researchers