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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on January 31, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(3):559-569; doi:10.1093/icesjms/fsl045
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Published by Oxford University Press 2007 For Permissions, please email: journals.permissions@oxfordjournals.org

Geostatistical simulations of eastern Bering Sea walleye pollock spatial distributions, to estimate sampling precision

Paul D. Walline

Alaska Fisheries Science Center, NMFS, NOAA, 7600 Sand Point Way NE, Building 4; Seattle WA 98115, USA

tel: +1 206 526 4681; fax: +1 206 526 6723; e-mail: paul.walline{at}noaa.gov

Walline, P. D. 2007. Geostatistical simulations of eastern Bering Sea walleye pollock spatial distributions, to estimate sampling precision. – ICES Journal of Marine Science, 64: 559–569.

Sequential Gaussian and sequential indicator geostatistical simulation methods were used to estimate confidence intervals (CIs) for biomass estimates from six echo-integration trawl surveys of eastern Bering Sea walleye pollock (Theragra chalcogramma) biomass. Uncertainty in the acoustic and the length frequency data was combined in the calculation of CIs. Sampling in 2002 provided evidence for isotropy in the spatial distribution. Variogram models were characterized by long ranges (75–122 nautical miles for non-zero acoustic data, for example) compared with the smallest dimension of the survey area (~100 nautical miles) and small nugget effects (~20% of the semi-variance in transformed normal space for acoustic data). The 95% CIs obtained for the abundance estimates did not vary greatly between years and were similar to those from a one-dimensional transitive geostatistical analysis, i.e. ± 5–9% of estimated total biomass.

Keywords: confidence intervals, geostatistical simulation, hydroacoustic survey precision, walleye pollock

Received 30 May 2006; accepted 17 December 2006; advance access publication 31 January 2007.


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