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JPR Advance Access originally published online on November 5, 2008
Journal of Plankton Research 2009 31(1):73-91; doi:10.1093/plankt/fbn103
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Distribution of cephalopod paralarvae in relation to the regional oceanography of the western Iberia

Ana Moreno1,*, Antonina Dos Santos1, Uwe Piatkowski2, A. Miguel P. Santos1 and Henrique Cabral3

1 Instituto Nacional de Recursos Biológicos (INRB/L-IPIMAR), AV. Brasília, 1449-006 Lisboa, Portugal 2 Leibniz-Institut Fuer Meereswissenschaften (Ifm-Geomar), Universitaet Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany 3 Universidade de Lisboa, Faculdade de Ciências, Instituto de Oceanografia, Campo Grande, 1749-016 Lisboa, Portugal

* CORRESPONDING AUTHOR: amoreno{at}ipimar.pt

Received on January 11, 2008; accepted on October 8, 2008


  Abstract

The present study analyses the distribution of cephalopod paralarvae off the Portuguese coast. The effects of temporal and physical variables on Loligo vulgaris, Octopus vulgaris, sepiolid and ommastrephid abundances are analysed with generalized linear models. Their distribution patterns are discussed in relation to mesoscale features, including currents, thermal fronts and coastal upwelling cross-shelf transport, prevailing in the western Iberia upwelling system. Paralarvae of the neritic species occur during a considerably extended period of the year with two or three abundance peaks within the highly productive upwelling system of the western Portuguese coast and contrasting with the Gulf of Cadiz area. Temperature and upwelling were shown to be the most important variables in modulating seasonality and distribution of these paralarvae. The influence of the physical environment is particularly pronounced for the paralarvae of O. vulgaris, following distinct patterns according to the oceanography of the western Iberia and the Gulf of Cadiz systems. The paralarvae of oceanic species, which in many cases have their northern limit of distribution at these latitudes, were mainly found in the southern part of the sampling area. The distribution of these species indicates that the prevailing oceanographic features of the Gulf of Cadiz system, especially fronts, together with temperature act as boundaries to geographic dispersal, contributing to an area of high cephalopod biodiversity in the southern Portuguese waters.

Corresponding editor: Mark J. Gibbons


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