Two toxigenic Ostreopsis species, O. cf. ovata and O. siamensis (Dinophyceae), from the South China Sea, tropical Western Pacific

Type Article
Date 2022-03
Language English
Author(s) Gu HaifengORCID1, 2, Wang Yinuo1, 2, Derrien AmelieORCID3, Hervé FabienneORCID4, Wang Na2, Pransilpa Mitila5, Lim Po Teen6, Leaw Chui Pin6
Affiliation(s) 1 : School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China
2 : Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
3 : Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau CEDEX, France
4 : Ifremer (French Research Institute for Exploitation of the Sea), DYNECO, laboratoire Phycotoxines, rue de l'Ile d'Yeu, F-44311 Nantes Cedex 03, , France
5 : Department of Marine and Coastal Resources, East Gulf of Thailand, Rayong, Thailand
6 : Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Source Harmful Algae (1568-9883) (Elsevier BV), 2022-03 , Vol. 113 , P. 102206 (13p.)
DOI 10.1016/j.hal.2022.102206
WOS© Times Cited 1
Keyword(s) BHAB, Dinoflagellates, Genetics, Morphology, Ostreopsis, Ovatoxins, Ostreocin

In the dinophyte genus Ostreopsis, seven out of 11 described species are known to produce various toxic compounds that were characterized in the palytoxins family. Species in the genus shared identical thecal plate patterns but differed in size, shape, and thecal plate ornamentation. Two species, O. cf. ovata and O. siamensis, have been reported from the Western Pacific, but information on toxin production is scarce. Here, we established nine strains of Ostreopsis from six localities in the South China Sea (SCS), covering the Gulf of Thailand, northern SCS (Hainan Island, Beibu Bay), and southern SCS (Peninsular Malaysia). Their morphology was examined by light and electron microscopy and the molecular phylogeny was inferred based on the LSU rDNA (D1-D3) and ITS rDNA sequences using maximum likelihood and Bayesian inference. Both O. cf. ovata and O. siamensis, albeit morphologically closely related, can be distinguished by a feature of the thecal pores with pronounced ridges in the latter. Molecular data further supported their species identity. Toxin production in the strains was examined by LC-MS/MS. O. cf. ovata strain T5PRBost02 was observed to produce Ovatoxin-k and Ovatoxin-j2 only; while Ostreocin-B and Ostreocin-D was produced by O. siamensis strain T10PRBost04. This is the first report confirming the production of palytoxins analogs in Ostreopsis species from the region.

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Gu Haifeng, Wang Yinuo, Derrien Amelie, Hervé Fabienne, Wang Na, Pransilpa Mitila, Lim Po Teen, Leaw Chui Pin (2022). Two toxigenic Ostreopsis species, O. cf. ovata and O. siamensis (Dinophyceae), from the South China Sea, tropical Western Pacific. Harmful Algae, 113, 102206 (13p.). Publisher's official version : , Open Access version :