Environmental characteristics of Agulhas rings affect interocean plankton transport

E. Villar 1 G. Farrant 2 M. Follows 3 L. Garczarek 2 S. Speich 4, 5 S. Audic 2 L. Bittner 2, 6 Bruno Blanke 4 J. Brum 7 C. Brunet 8 R. Casotti 8 A. Chase 9 J. Dolan 10, 11 F. d'Ortenzio 10, 11 P. Gattuso 10, 11 N. Grima 4 L. Guidi 10, 11 C. Hill 3 O. Jahn 3 Jean-Louis Jamet 12 Hervé Le Goff 13, 14 C. Lepoivre 1 S. Malviya 6 E. Pelletier 15, 16 J.-B. Romagnan 10, 11 S. Roux 7 S. Santini 1 E. Scalco 8 S. Schwenck 7 Pierre Testor 17 A. Tanaka 6 T. Vannier 15, 16 F. Vincent 6 A. Zingone 8 C. Dimier 2, 6 M. Picheral 10, 18 S. Searson 10, 18 S. Kandels-Lewis 19 S. Acinas 20 P. Bork 19, 21 E. Boss 9 C. de Vargas 2 G. Gorsky 10, 18 H. Ogata 1 S. Pesant 22, 23 M. Sullivan 7 S. Sunagawa 19 P. Wincker 15, 16 E. Karsenti 6, 19 C. Bowler 6 F. Not 2 P. Hingamp 1 D. 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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E. Villar, G. Farrant, M. Follows, L. Garczarek, S. 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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