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JPR Advance Access published online on August 16, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm064
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Fine scale zooplankton distribution in the Bay of Biscay in spring 2004

Aitor Albaina* and Xabier Irigoien

Marine Research Division, AZTI Foundation, Herrera Kaia Portualde, z/g 20110, Pasaia (Gipuzkoa), SPAIN

* Corresponding author: Aitor Albaina E-mail: aitoralbaina{at}hotmail.com, Tel.: 0034 658749734

Received on January 29, 2007; revised on July 19, 2007; accepted on August 9, 2007


  Abstract

A fine scale spatial resolution survey (3 x 15 nautical miles) was conducted during May 2004 in the Bay of Biscay (43.32° N to 46.12° N and 1.29° W to 4.31° W), to study the zooplankton community during the onset of spring stratification. Cluster analysis classified the 45 most abundant taxa into 7 major groups. In the southern part of the surveyed area, a front separating neritic waters from eddies off the shelf delimited distinct zooplankton communities. On the northern side of the surveyed area, river plumes and the generation of internal waves over the shelf-break were the main mesoscale structures determining the composition and abundance of the zooplankton assemblages. Canonical Correspondence Analysis (CCA) and Generalized Additive Models (GAMs) were used to investigate the relationship between zooplankton species distribution and selected environmental variables (sea surface temperature and salinity along with water column stratification and fluorescence pattern). Surface salinity and stratification index were the variables explaining the higher percentage of the deviance. The results of the survey conducted during May 2004 in the Bay of Biscay suggest that a limited number of environmental variables may be sufficient to attempt statistical modeling of zooplankton distribution.

Key Words: Zooplankton • mesoscale structures • Bay of Biscay • Canonical Correspondence Analysis (CCA) • Generalized Additive Models (GAMs)

Communicating Editor: K.J. Flynn


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