Diversity and toxic potential of algal bloom-forming species from Takaroa lagoon (Tuamotu, French Polynesia): a field and mesocosm study

Type Article
Date 2019
Language English
Author(s) Rodier M1, Longo S2, Henry K2, Ung A2, Lo-Yat Alain3, Darius Ht2, Viallon J2, Beker B4, Delesalle B5, Chinain M2
Affiliation(s) 1 : Institut de Recherche pour le Développement (IRD), UMR 241 EIO (Université de la Polynésie, IRD, Institut Louis Malardé, IFREMER), Laboratoire d’Excellence CORAIL, Faa’a, Tahiti, French Polynesia
2 : Laboratoire des Micro-Algues Toxiques, Institut Louis Malardé, UMR 241 EIO, 98713 Papeete-Tahiti, French Polynesia
3 : Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Centre du Pacifique, UMR 241 EIO (UPF, IRD, ILM, IFREMER), Laboratoire d’Excellence CORAIL, Vairao, Tahiti, French Polynesia
4 : Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR 6539 CNRS, Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, Place Nicolas Copernic, 29280 Plouzané, France
5 : EPHE, PSL Université, UPVD-CNRS, USR3278 CRIOBE, 66860 Perpignan, France
Source Aquatic Microbial Ecology (0948-3055) (Inter-Research Science Center), 2019 , Vol. 83 , N. 1 , P. 15-34
DOI 10.3354/ame01900
Keyword(s) Phytoplankton, Taxonomy, Mesocosm, Bloom-forming species, Toxicity, French Polynesian lagoons
Abstract

Pearl farming lagoons are economically important, yet poorly studied ecosystems in French Polynesia. This paper describes a study conducted in 2016 in Takaroa (Tuamotu Archipelago), an atoll recurrently affected by harmful algal bloom (HAB) events. The objectives were to gain insight into phytoplankton community composition, identify the main bloom-forming species and investigate their potential for toxicity. A mesocosm approach was used to assess the response of phytoplankton communities to 3 nutrient treatments: Conway with Si, Si-depleted f/2 and a commercial N-P fertilizer. In total, 87 morpho-species were described from Takaroa lagoon, with dinoflagellates as the most diverse group. Diatoms (Extubocellulus sp., Cylindrotheca closterium, Nitzschia spp.), dinoflagellates (Gymnodinium spp., Heterocapsa spp.) and flagellates (Cryptomonas sp., Pyraminonas spp.) were among the major bloom-forming species identified. Most markedly, Extubocellulus sp., a diatom never reported from French Polynesia before, was able to bloom even in Si-poor environments. Additionally, in vitro cultures of 12 bloom-forming strains were successfully established and tested for their toxicity. Preliminary results suggest that 9 strains, including dinoflagellates (Prorocentrum lima, Amphidinium spp., Heterocapsa sp.), Pyraminonadales (Pyramimonas sp.) and cryptophytes (Cryptomonas sp.), are the likely producers of cyclic imine neurotoxins and toxins acting on voltage-gated sodium channels. The contribution of these toxins to the mortality events previously reported in Takaroa lagoon is further discussed. Overall, this study highlights the relevance of a mesocosm approach which can be applied to other understudied atolls of French Polynesia recurrently threatened by HABs.

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Rodier M, Longo S, Henry K, Ung A, Lo-Yat Alain, Darius Ht, Viallon J, Beker B, Delesalle B, Chinain M (2019). Diversity and toxic potential of algal bloom-forming species from Takaroa lagoon (Tuamotu, French Polynesia): a field and mesocosm study. Aquatic Microbial Ecology, 83(1), 15-34. Publisher's official version : https://doi.org/10.3354/ame01900 , Open Access version : https://archimer.ifremer.fr/doc/00499/61059/