Environmental characteristics of Agulhas rings affect interocean plankton transport

Emilie Villar, Gregory K. Farrant, Michael Follows, Laurence Garczarek, Sabrina Speich, Stéphane Audic, Lucie Bittner, Bruno Blanke, Jennifer R. Brum, Christophe Brunet, Raffaella Casotti, Alison Chase, John R. Dolan, Fabrizio D'Ortenzio, Jean Pierre Gattuso, Nicolas Grima, Lionel Guidi, Christopher N. Hill, Oliver Jahn, Jean Louis JametHervé Le Goff, Cyrille Lepoivre, Shruti Malviya, Eric Pelletier, Jean Baptiste Romagnan, Simon Roux, Sébastien Santini, Eleonora Scalco, Sarah M. Schwenck, Atsuko Tanaka, Pierre Testor, Thomas Vannier, Flora Vincent, Adriana Zingone, Céline Dimier, Marc Picheral, Sarah Searson, Stefanie Kandels-Lewis, Peer Bork, Emmanuel Boss, Colomban De Vargas, Gabriel Gorsky, Hiroyuki Ogata, Stéphane Pesant, Matthew B. Sullivan, Shinichi Sunagawa, Patrick Wincker, Eric Karsenti, Chris Bowler, Fabrice Not, Pascal Hingamp, Daniele Iudicone, Silvia G. Acinas, Nigel Grimsley, Olivier Jaillon, Lee Karp-Boss, Uros Krzic, Jeroen Raes, Emmanuel G. Reynaud, Christian Sardet, Mike Sieracki, Lars Stemmann, Didier Velayoudon, Jean Weissenbach

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63 Scopus citations

Abstract

Agulhas rings provide the principal route for ocean waters to circulate from the Indo-Pacific to the Atlantic basin. Their influence on global ocean circulation is well known, but their role in plankton transport is largely unexplored. We show that, although the coarse taxonomic structure of plankton communities is continuous across the Agulhas choke point, South Atlantic plankton diversity is altered compared with Indian Ocean source populations. Modeling and in situ sampling of a young Agulhas ring indicate that strong vertical mixing drives complex nitrogen cycling, shaping community metabolism and biogeochemical signatures as the ring and associated plankton transit westward. The peculiar local environment inside Agulhas rings may provide a selective mechanism contributing to the limited dispersal of Indian Ocean plankton populations into the Atlantic.

Original languageEnglish (US)
Article number1261447
JournalScience
Volume348
Issue number6237
DOIs
StatePublished - May 22 2015

ASJC Scopus subject areas

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    Villar, E., Farrant, G. K., Follows, M., Garczarek, L., Speich, S., Audic, S., Bittner, L., Blanke, B., Brum, J. R., Brunet, C., Casotti, R., Chase, A., Dolan, J. R., D'Ortenzio, F., Gattuso, J. P., Grima, N., Guidi, L., Hill, C. N., Jahn, O., ... Weissenbach, J. (2015). Environmental characteristics of Agulhas rings affect interocean plankton transport. Science, 348(6237), [1261447]. https://doi.org/10.1126/science.1261447