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JPR Advance Access published online on September 11, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbl044
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received June 13, 2006
Accepted September 7, 2006

Article

Epipelagic siphonophore assemblages associated with water masses along a transect between Chile and Easter Island (eastern South Pacific Ocean)

Sergio Palma 1 * and Nelson Silva 1

1 Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Po Box 1020, Valparaíso, Chile

* To whom correspondence should be addressed.
Sergio Palma, E-mail: spalma{at}ucv.cl


  Abstract

We analyze for the first time the spatial distribution of siphonophores in relation to water masses along a 3750 km oceanic transect between the Chilean coast and Easter Island (27° S), a sector scarcely known of eastern South Pacific Ocean. Thirty-one siphonophore species were identified; Sulculeolaria turgida and Vogtia glabra were recorded for the first time in this sector. The most abundant species were Muggiaea atlantica (29.2%), Eudoxoides spiralis (24.5%), and Lensia subtilis (13.1%). Two different siphonophore assemblages east and west of 76° W, associated respectively with Subantarctic Water and Subtropical Water masses, can be used as water mass indicators. The former included the three most abundant species, whereas the latter showed greater species richness. The current study provides basic knowledge on spatial distribution of siphonophores, which is important to develop future research focused in understanding the ecological role and biological processes driven by planktonic organisms in the Southeastern Pacific Ocean.

Communicating Editor: KJ Flynn


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