Harmful diatoms and dinoflagellates in the Indian Ocean: a study from Southern coast of Sri Lanka

• DOI: 10.15421/2021_42
• Publication Date: 2021-01-01
• Authors: D.A.S.J. Dissanayake; Deepthi Wickramas...; P.M. Manage
• Keywords: Sri lanka

Studies on Harmful Algae (HA) are rare in the Indian Ocean around Sri Lanka. The current study investigated diatoms and dinoflagellates five Lankan Southern coast locations, focusing potentially harmful species. A total of twenty-seven diatom species ten dinoflagellate were identified during study. Among them, eight (Asterionellopsis glacialis, Chaetoceros curvisetus, lorenzianus, Guinardia flaccida, Leptocylindrus minimus, Nitzschia sp., Proboscia alata Pseudonitzschia fraudulenta) three (Ceratium fusus, Ceratium furca, Dinophysis caudata) as Specifically, P. fraudulenta related to producing domoic acid, causing Amnesic Shellfish Poisoning (ASP), was recorded all sampling locations. Potentially showed a significant correlation with turbidity phosphorus levels (p < 0.05). Discerning occurrence these region is vital, seascape under investigation anthropogenic pressure many sea routes. Even though bloom conditions not observable period, risk transporting microalgae different locations possibility formations cannot be ignored. As country surrounded by ocean, results demonstrated importance continuous monitoring HA regulating maritime land-based activities, covering broader area identify manage potential threats Ocean.

Keywords: Ocean; Lanka; coastal zone; algae; diatoms; dinoflagellates; water quality

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