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Toxic dinoflagellate blooms of Alexandrium catenella in Chilean fjords: a resilient winner from climate change

Mardones, JI, Muller, MN and Hallegraeff, GM ORCID: 0000-0001-8464-7343 2017 , 'Toxic dinoflagellate blooms of Alexandrium catenella in Chilean fjords: a resilient winner from climate change' , ICES Journal of Marine Science, vol. 74, no. 4 , pp. 988-995 , doi: 10.1093/icesjms/fsw164.

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Exposure of the toxigenic dinoflagellate Alexandrium catenella to variations in pCO2/pH, comparable to current and near-future levels observed in Southern Chilean fjords, revealed potential functional adaptation mechanisms. Under calculated conditions for pH(total scale) and pCO2 ranging from 7.73–8.66 to 69.7–721.3 μatm, respectively, the Chilean strain Q09 presented an optimum growth rate and dissolved inorganic carbon (DIC) uptake at near-equilibrium pCO2/pH conditions (∼8.1). DistaLM analysis between physiological relevant carbonate system parameters (CO2, HCO as the unique variable explaining a significant portion of the physiological response. Estimations of equivalent spherical diameter (ESD) and chain-formation index (CI) revealed reduced cell size and enhanced chain formation at high pH/low pCO2 conditions. Light intensity as co-factor during experiments (50 vs. 100 μmol photons m−2 s−1) produced no effect on ESD and CI. Cells exposed to low light; however, had reduced cell growth and DIC uptake especially at high pH/low pCO2. We suggest that A. catenella Chilean strains are highly adapted to spatio-temporal pCO2/pH fluctuations in Chilean fjords, becoming a resilient winner from expected climate change effects.

Item Type: Article
Authors/Creators:Mardones, JI and Muller, MN and Hallegraeff, GM
Keywords: Alexandrium catenella, cell size, chain-forming, Chilean fjords, DIC uptake, harmful algal blooms
Journal or Publication Title: ICES Journal of Marine Science
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 1054-3139
DOI / ID Number: 10.1093/icesjms/fsw164
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Copyright 2016 International Council for the Exploration of the Sea

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