Seasonal occurrence of the potentially toxic benthic armoured dinoflagellates in Nha Trang Bay, South Central Coast of Viet Nam

Seasonal variations of the potentially toxic benthic dinoflagellates (bHABs) were studied during one year in the Bai Lan, Nha Trang Bay, South Central Viet Nam. Physical conditions (temperature, salinity, photosynthetically active radiation) and nutrient (NO3-N, PO4-P, DIN) concentrations were measu...

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Bibliographic Details
Published in:Regional studies in marine science 2022-09, Vol.55, p.102627, Article 102627
Main Authors: Nguyen-Ngoc, Lam, Doan-Nhu, Hai, Phan-Tan, Luom, Huynh-Thi, Duyen Ngoc, Nguyen-Tam, Vinh, Pham, Anh H., Tran-Thi, Hue Minh, Tran-Thi, Van Le, Tester, Patricia
Format: Article
Language:English
Subjects:
Bai Lan
bHABs
Gambierdiscus
Nha Trang Bay
Ostreopsis
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Summary:Seasonal variations of the potentially toxic benthic dinoflagellates (bHABs) were studied during one year in the Bai Lan, Nha Trang Bay, South Central Viet Nam. Physical conditions (temperature, salinity, photosynthetically active radiation) and nutrient (NO3-N, PO4-P, DIN) concentrations were measured. The quantitative density of bHABs on the window screen sampling devices was determined in a range of seafloor types (dead coral, sand, and seaweeds) and retrieved within 24 h after placement. Results showed that twenty-one species of bHABs were recorded with Coolia malayensis, Ostreopsis lenticularis, O cf. ovata, O. siamensis, Prorocentrum emarginatum, and P. lima occurring throughout the year. The cell density of bHABs showed unclear seasonality, with Bystmatrum spp., Gambierdiscus spp., Ostreopsis lenticularis, and Coolia spp. absent in November 2020, concurrent with a peak in rainfall. The non-metric multidimensional scaling (NMDS) analysis showed that there was a high similarity between Gambierdiscus abundance and phosphate content. The densities of O. lenticularis, O. siamensis, and P. emarginatum were, in contrast, more closely associated with photosynthetically active radiation (PAR). Ostreopsis cf. ovata was less influenced by environmental conditions.
ISSN:2352-4855
2352-4855
DOI:10.1016/j.rsma.2022.102627