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Climate variability drives plankton community composition changes: The 2010-2011 El Niño to la Niña transition around Australia

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journal contribution
posted on 2023-05-19, 09:01 authored by Thompson, PA, Bonham, P, Thomson, P, Rochester, W, Doblin, MA, Waite, AM, Richardson, A, Rousseaux, CS
The strong La Niña of 2010-2011 provided an opportunity to investigate the ecological impacts of El Niño-Southern Oscillation on coastal plankton communities using the nine national reference stations around Australia. Based on remote sensing and across the entire Australian region 2011 (La Niña) was only modestly different from 2010 (El Niño) with the average temperature declining 0.2%, surface chlorophyll a up 3% and modelled primary production down 14%. Other changes included a poleward shift in Prochlorococcus and Synechococcus. Along the east coast, there was a reduction in salinity, increase in nutrients, Chlorophytes and Prasinophytes (taxa with chlorophyll b, neoxanthin and prasinoxanthin). The southwest region had a rise in the proportion of 19-hexoyloxyfucoxanthin; possibly coccolithophorids in eddies of the Leeuwin Current and along the sub-tropical front. Pennate diatoms increased, Ceratium spp. decreased and Scrippsiella spp. increased in 2011. Zooplankton biomass declined significantly in 2011. There was a reduction in the abundance of Calocalanus pavo and Temora turbinata and increases in Clausocalanus farrani, Oncaea scottodicarloi and Macrosetella gracilis in 2011. The changes in the plankton community during the strong La Niña of 2011 suggest that this climatic oscillation exacerbates the tropicalization of Australia.

History

Publication title

Journal of Plankton Research

Volume

37

Issue

5

Pagination

966-984

ISSN

0142-7873

Department/School

Institute for Marine and Antarctic Studies

Publisher

Oxford Univ Press

Place of publication

Great Clarendon St, Oxford, England, Ox2 6Dp

Rights statement

Copyright The Author 2015

Repository Status

  • Open

Socio-economic Objectives

Marine biodiversity

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    University Of Tasmania

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