Reorganization of Southern Ocean plankton ecosystem at the onset of Antarctic glaciation

Alexander J P Houben, Peter K Bijl, Jörg Pross, Steven M Bohaty, Sandra Passchier, Catherine E Stickley, Ursula Röhl, Saiko Sugisaki, Lisa Tauxe, Tina van de Flierdt, Matthew Olney, Francesca Sangiorgi, Appy Sluijs, Carlota Escutia, Henk Brinkhuis, Carlota Escutia Dotti, Adam Klaus, Annick Fehr, Trevor Williams, James A P BendleStephanie A Carr, Robert B Dunbar, José-Abel Flores, Jhon J Gonzàlez, Travis G Hayden, Masao Iwai, Francisco J Jimenez-Espejo, Kota Katsuki, Gee Soo Kong, Robert M McKay, Mutsumi Nakai, Stephen F Pekar, Christina Riesselman, Toyosaburo Sakai, Ulrich Salzmann, Prakash K Shrivastava, Shouting Tuo, Kevin Welsh, Masako Yamane, Expedition 318 Scientists

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

The circum-Antarctic Southern Ocean is an important region for global marine food webs and carbon cycling because of sea-ice formation and its unique plankton ecosystem. However, the mechanisms underlying the installation of this distinct ecosystem and the geological timing of its development remain unknown. Here, we show, on the basis of fossil marine dinoflagellate cyst records, that a major restructuring of the Southern Ocean plankton ecosystem occurred abruptly and concomitant with the first major Antarctic glaciation in the earliest Oligocene (~33.6 million years ago). This turnover marks a regime shift in zooplankton-phytoplankton interactions and community structure, which indicates the appearance of eutrophic and seasonally productive environments on the Antarctic margin. We conclude that earliest Oligocene cooling, ice-sheet expansion, and subsequent sea-ice formation were important drivers of biotic evolution in the Southern Ocean.

Original languageEnglish
Pages (from-to)341-344
Number of pages4
JournalScience
Volume340
Issue number6130
DOIs
Publication statusPublished - 19 Apr 2013

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