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Environmental characteristics of Agulhas rings affect interocean plankton transport

Item Type:Article
Title:Environmental characteristics of Agulhas rings affect interocean plankton transport
Creators Name:Villar, E. and Farrant, G.K. and Follows, M. and Garczarek, L. and Speich, S. and Audic, S. and Bittner, L. and Blanke, B. and Brum, J.R. and Brunet, C. and Casotti, R. and Chase, A. and Dolan, J.R. and d'Ortenzio, F. and Gattuso, J.P. and Grima, N. and Guidi, L. and Hill, C.N. and Jahn, O. and Jamet, J.L. and Le Goff, H. and Lepoivre, C. and Malviya, S. and Pelletier, E. and Romagnan, J.B. and Roux, S. and Santini, S. and Scalco, E. and Schwenck, S.M. and Tanaka, A. and Testor, P. and Vannier, T. and Vincent, F. and Zingone, A. and Dimier, C. and Picheral, M. and Searson, S. and Kandels-Lewis, S. and Acinas, S.G. and Bork, P. and Boss, E. and de Vargas, C. and Gorsky, G. and Ogata, H. and Pesant, S. and Sullivan, M.B. and Sunagawa, S. and Wincker, P. and Karsenti, E. and Bowler, C. and Not, F. and Hingamp, P. and Iudicone, D.
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.
Keywords:Atlantic Ocean, Genetic Selection, Genetic Variation, Indian Ocean, Metagenomics, Nitrites, Nitrogen, Plankton, Ribosomal DNA, Seawater
Source:Science
ISSN:0036-8075
Publisher:American Association for the Advancement of Science (U.S.A.)
Volume:348
Number:6237
Page Range:1261447
Date:22 May 2015
Official Publication:https://doi.org/10.1126/science.1261447
PubMed:View item in PubMed

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