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JPR Advance Access first published online on September 22, 2008
This version published online on October 15, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn096
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

SPRING ZOOPLANKTON DISTRIBUTION IN THE BAY OF BISCAY FROM 1998 TO 2006 IN RELATION WITH ANCHOVY RECRUITMENT

Xabier Irigoien1, Jose Antonio Fernandes1, Philippe Grosjean2, Kevin Denis2, Aitor Albaina and Maria Santos1

1 AZTI – TECNALIA, Herrera kaia z/g, 20110 Pasajes, Spain 2 University of Mons, Numerical Ecology of Aquatic Systems, 8, Avenue du Champ de Mars, Mons 7000, Belgium

Corresponding Author E-mail: xirigoien{at}pas.azti.es

Received on May 27, 2008; revised on September 12, 2008; accepted on September 19, 2008
  Abstract

The objective of this study was to investigate whether successive recruitment failures in the anchovy fishery in the Bay of Biscay were due to changes in the zooplankton biomass or composition. Image analysis and automatic recognition were used to analyse zooplankton samples collected during diel egg production method (DEPM) spring surveys from 1998 to 2006. We were not able to detect any trend in zooplankton biomass during this period. The zooplankton spatial distribution showed permanent features with large organisms being more abundant over the shelf break and outer areas. Finally we found a negative correlation between anchovy recruitment and zooplankton biomass which suggests that the 2002 – 2006 failures in anchovy recruitment in the Bay of Biscay are not due to a decrease in mesozooplankton biomass.

Key Words: zooplankton • image analysis • machine learning (or supervised classification) • Bay of Biscay • anchovy


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