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Environmental characteristics of Agulhas rings affect interocean plankton transport

Emilie Villar 1 Gregory F. Farrant 2 Michael Follows 3 Laurence Garczarek 2 Sabrina Speich 4, 5 Stéphane Audic 2 Lucie Bittner 2, 6 Bruno Blanke 4 Jennifer R. Brum 7 Christophe Brunet 8 Raffaella Casotti 8 Alison Chase 9 John R. Dolan 10, 11 F. d'Ortenzio 10, 11 Jean-Pierre Gattuso 10, 11 N. Grima 4 Lionel Guidi 10, 11 Christopher N. Hill 3 Olivier Jahn 3 Jean-Louis Jamet 12 Hervé Le Goff 13, 14 Cyrille Lepoivre 1 Shruti Malviya 6 Éric Pelletier 15, 16 Jean-Baptiste Romagnan 10, 11 S. Roux 7 Sébastien Santini 1 Eleonora Scalco 8 Sarah M. Schwenck 7 Pierre Testor 17 Atsuko Tanaka 6 Thomas Vannier 15, 16 Flora Vincent 6 Adriana Zingone 8 Céline Dimier 2, 6 Marc Picheral 10, 18 Sarah Searson 10, 18 Stefanie Kandels-Lewis 19 Silvia Acinas 20 Peer Bork 19, 21 Emmanuel Boss 9 Colomban de Vargas 2 Gabriel Gorsky 10, 18 Hiroyuki Ogata 1 Stephan Pesant 22, 23 Matthew Sullivan 7 Shinichi Sunagawa 19 Patrick Wincker 15, 16 Eric Karsenti 6, 19 Chris Bowler 6 Fabrice Not 2 P. Hingamp 1 Daniele Iudicone 8
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.
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Submitted on : Thursday, October 11, 2018 - 3:54:25 PM
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Emilie Villar, Gregory F. Farrant, Michael Follows, Laurence Garczarek, Sabrina Speich, et al.. Environmental characteristics of Agulhas rings affect interocean plankton transport. Science, American Association for the Advancement of Science, 2015, 348 (6237), pp.1261447 - 1261447. ⟨10.1126/science.1261447⟩. ⟨hal-01893637⟩

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