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Distribution of euphausiid larvae along the coast of East Antarctica in the Dumont d'Urville Sea (139–145°E) during summer 2004

Published online by Cambridge University Press:  16 December 2008

Carole Vallet*
Affiliation:
Université d'Artois, centre IUFM Nord - Pas de Calais, 10 rue Hippolyte Adam, 62230 Outreau, France Université du Littoral Côte d'Opale, Laboratoire d'Océanologie et de Géosciences, CNRS, UMR 8187 LOG, 32 avenue Foch, 62930 Wimereux, France
Philippe Koubbi
Affiliation:
Université Paris 06, UMR 7093, Laboratoire d'Océanographie de Villefranche, 06230 Villefranche-sur-Mer, FranceCNRS, UMR 7093, LOV, 06230 Villefranche-sur-Mer, France
Emmanuelle Sultan
Affiliation:
LOCEAN/MNHN, Université Pierre et Marie Curie, case 100, 4 place Jussieu, 75005 Paris, France
Anne Goffart
Affiliation:
Laboratoire d'Océanologie, MARE Center, Université de Liège, Bat. B6c, Allée de la Chimie, 3, 4000 Liège, Belgium
Kerrie M. Swadling
Affiliation:
Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute and School of Zoology, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia
Simon W. Wright
Affiliation:
Australian Antarctic Division and Antarctic Climate and Ecosystems CRC, 203 Channel Highway, Kingston, TAS 7050, Australia

Abstract

The distribution of euphausiid larvae along the coast of Terre Adélie, Antarctica, was assessed using oblique tows of a double-framed bongo net at 38 stations during summer 2004. Larvae of Euphausia crystallorophias and Thysanoessa macrura were observed. For E. crystallorophias larvae, the calyptopis I stage was dominant along the coast, while the most commonly observed stage of T. macrura was the furcilia. The distribution of E. crystallorophias larvae were correlated with abiotic factors, including depth and sea surface salinity, whereas those of T. macrura larvae were correlated with biotic factors, especially chlorophyll a and nitrate. Developmental stages of both species increased in age from west to east in the survey area, with younger developmental stages (metanauplius and calyptopis I) in the western part of the region and older stages (calyptopis II and III and furcilia I to VI) in the eastern part near the Mertz Glacier Tongue (MGT). It is suggested that these patterns could be linked with the water circulation and wind: near the MGT gyres could concentrate all developmental stages of both species near the coast, while katabatic winds near Dumont d'Urville will promote larval advection seawards, with younger stages near the coast and older stages further offshore.

Information

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2008

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