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Modelling the effects of marine aggregate extraction on benthic assemblages

Published online by Cambridge University Press:  19 August 2009

Jon Barry ,
Sian Boyd  and
Robert Fryer
Jon Barry*
Affiliation:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk, NR33 OHT, UK
Sian Boyd
Affiliation:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk, NR33 OHT, UK
Robert Fryer
Affiliation:
FRS Marine Laboratory, PO Box 101, 375 Victoria Road, Aberdeen, AB11 9DB, Scotland
*
Correspondence should be addressed to: J. Barry, Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk, NR33 OHT, UK email jon.barry@cefas.co.uk
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Abstract

This paper develops models of the initial impact of marine aggregate extraction on a benthic assemblage. We predict the effect of dredging on species numbers and abundance assuming spatial randomness of individuals. We extend the model to allow for spatial clustering of individuals using a Matern process. Data from a controlled field experiment are used to develop a framework for estimating species reduction. This involves modelling the spatial pattern of individuals before dredging using a Matern process, the impact of dredging at an individual level, and the probability that a species is not seen in a post-dredging survey. The framework was used to estimate that, of the 41 species that were seen in a pre-dredging survey but not in a post-dredging survey, between 0 and 14 were eliminated (with 95% likelihood) rather than escaped detection. The most likely number eliminated was 4.

Keywords

species richness and abundanceimpact surveysspatial point processesMatern cluster processmaximum likelihooddredgingmarine aggregate extractionbenthic assemblage
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 1 , February 2010 , pp. 105 - 114
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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