Environmental characteristics of Agulhas rings affect interocean plankton transport - Archive ouverte HAL
Article Dans Une Revue Science Année : 2015

Environmental characteristics of Agulhas rings affect interocean plankton transport

Stéphane Audic
Bruno Blanke
Alison Chase
  • Fonction : Auteur
N. Grima
S. Roux
  • Fonction : Auteur
Adriana Zingone
Emmanuel Boss
Hiroyuki Ogata
Matthew Sullivan
Chris Bowler
Fabrice Not
P. Hingamp
Daniele Iudicone

Résumé

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.

Dates et versions

hal-01893637 , version 1 (11-10-2018)

Identifiants

Citer

Emilie Villar, Gregory Farrant, Michael Follows, Laurence Garczarek, Sabrina Speich, et al.. Environmental characteristics of Agulhas rings affect interocean plankton transport. Science, 2015, 348 (6237), pp.1261447 - 1261447. ⟨10.1126/science.1261447⟩. ⟨hal-01893637⟩
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