Differential influence of life cycle on growth and toxin production of three Pseudo-nitzschia species (Bacillariophyceae)

Type Article
Date 2019-10
Language English
Author(s) Sauvey Aurore1, 2, Claquin Pascal1, 2, Le Roy Bertrand1, 2, Le Gac MickaelORCID3, Fauchot Juliette1, 2
Affiliation(s) 1 : Normandie Univ; UNICAEN; CNRS; BOREA; 14000 Caen ,France
2 : Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA); Muséum National d'Histoire Naturelle; Sorbonne Université; Université de Caen Normandie; Université des Antilles; CNRS; IRD 14000 Caen ,France
3 : Ifremer, DYNECO PELAGOS; 29280 Plouzané ,France
Source Journal Of Phycology (0022-3646) (Wiley), 2019-10 , Vol. 55 , N. 5 , P. 1126-1139
DOI 10.1111/jpy.12898
WOS© Times Cited 6
Keyword(s) cell size, domoic acid, growth, life cycle, Pseudo-nitzschia strains

We used a multi‐strain approach to study the intra‐ and interspecific variability of the growth rates of three Pseudo‐nitzschia species – P. australis, P. fraudulenta, and P. pungens – and of their domoic acid (DA) production. We carried out mating and batch experiments to investigate the respective effects of strain age and cell size, and thus the influence of their life cycle on the physiology of these species. The cell size ‐ life cycle relationship was characteristic of each species. The influence of age and cell size on the intraspecific variability of growth rates suggests that these characteristics should be considered cautiously for the strains used in physiological studies on Pseudo‐nitzschia species. The results from all three species do not support the hypothesis of a decrease in DA production with time since isolation from natural populations. In P. australis, the cellular DA content was rather a function of cell size. More particularly, cells at the gametangia stage of their life cycle contained up to six times more DA than smaller or larger cells incapable of sexual reproduction. These findings reveal a link between P. australis life cycle and cell toxicity. This suggest that life cycle dynamics in Pseudo‐nitzschia natural populations may influence bloom toxicity.

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Sauvey Aurore, Claquin Pascal, Le Roy Bertrand, Le Gac Mickael, Fauchot Juliette (2019). Differential influence of life cycle on growth and toxin production of three Pseudo-nitzschia species (Bacillariophyceae). Journal Of Phycology, 55(5), 1126-1139. Publisher's official version : https://doi.org/10.1111/jpy.12898 , Open Access version : https://archimer.ifremer.fr/doc/00505/61679/