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Seasonal dynamics of dinoflagellates with special emphasis on potentially harmful species in a tropical estuarine system along the southwest coast of India

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Abstract

To understand seasonal variations of the dinoflagellate community in the estuarine waters of Cochin (Southwest coast of India), the abundance and species composition, in particular the harmful species, were investigated. The study records 43 species of dinoflagellates belonging to 6 orders and 19 genera, with the genus Protoperidinium (14 species) being the most diverse one, followed by the genus Tripos (5 species). Diversity and abundance of dinoflagellates were maximum during the pre-monsoon season (H′ 2.08 and 3.9 × 103 cells L−1, respectively). The numerical abundance correlated well with environment variables like surface water temperature (r = 0.89, p < 0.01), salinity (r = 0.64, p < 0.05), phosphate concentration (r = 0.70, p < 0.05) and turbidity (r = − 0.835, p < 0.01) suggesting their role in the growth and sustenance of dinoflagellates. The presence of 19 harmful dinoflagellate species, with Akashiwo sanguinea, Noctiluca scintillans and Peridinium quardidentatum forming their blooms in the region, also emphasizes potential risks for future HAB outbreaks along the southwest coast of India.

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Acknowledgements

The first author is thankful to the Cochin University of Science and Technology, Kochi, Kerala, India, for the award of the Junior Research Fellowship (U-JRF).

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  1. Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, Kochi-16, Kerala, India

    Twinkle Sathish, A. K. Nazrin, Lathika Cicily Thomas & K. B. Padmakumar

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TS wrote the manuscript with input from NAK and LCT. NAK and TS conducted the field study. TS and LCT contributed to the taxonomic identification. KBP supervised this study and provided research materials.

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Sathish, T., Nazrin, A.K., Thomas, L.C. et al. Seasonal dynamics of dinoflagellates with special emphasis on potentially harmful species in a tropical estuarine system along the southwest coast of India. J Oceanogr 78, 397–408 (2022). https://doi.org/10.1007/s10872-022-00648-3

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