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ICES Journal of Marine Science: Journal du Conseil 2004 61(1):12-24; doi:10.1016/j.icesjms.2003.11.001
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Buffered random sampling: a sequential inhibited spatial point process applied to sampling in a trawl survey for northern shrimp Pandalus borealis in West Greenland waters

M.C.S. Kingsleya,*, P. Kanneworffb and D.M. Carlssonb

a Greenland Institute of Natural Resources PO Box 570, DK-3900 Nuuk, Greenland
b Greenland Institute of Natural Resources Pilestraede 52, PO Box 2151, DK-1016 Copenhagen K, Denmark

*Correspondence to M.C.S. Kingsley: tel: +299 32 1095; fax: +299 32 5957. e-mail: mcsk{at}natur.gl.

A stratified random sample survey has been carried out since 1988 as a component of the assessment of the stock of northern shrimp Pandalus borealis in offshore West Greenland waters. In 1999, the placing of stations independently and randomly was replaced by buffered random sampling, in which stations were randomly placed but prevented from being closer together than a prescribed limit. Buffered random sampling gave a more even distribution of stations within strata, and nearest-neighbour distances were on average increased by 50%. The statistical effects were difficult to determine, but did not appear to be large, and the estimated standard errors did not change much from previous years. However, the buffered sampling method generated designs in which stations were evenly distributed over the strata, and did away with the need for subjective manual adjustment of the positions of stations which independent random sampling sometimes placed too close to another station.

Keywords: buffered sampling, random sampling, sampling, survey, survey design

Received 8 January 2002; accepted 3 November 2003.


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