Algal bloom of Diatoma vulgaris in coastal waters of Dakshina Kannada

Sulochanan, Bindu and Veena, S and Rohit, Prathibha and Sobhana, K S (2023) Algal bloom of Diatoma vulgaris in coastal waters of Dakshina Kannada. Marine Fisheries Information Service, Technical and Extension Series (256). pp. 21-23. ISSN ISSN 0254-380X

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Abstract

A bloom of Diatoma vulgaris (1.20 x 105 cells ml-1) was foundin the coastal waters off Iddya (12°59’28.5”N 74°47’28.3”E)near Surathkal in Mangaluru city on 14th May 2022, and thechanges in nutrient status dissipated the bloom within a week. D. vulgaris cells form zig-zag chains and are foundattached to submerged rocks, concrete, pipes and other structures as they are benthic diatoms. Diatoms prefer distinct ranges of pH, salinity, nutrient concentration, suspended sediment, flow regime, elevation and are influenced by anthropogenic disturbances. Climate affects diatoms in complex ways and frequency, severity of droughts, floods etc. impacts the occurrence of diatom species and their distribution. Hence, monitoring the occurrence and distribution of diatoms gives an idea about the impact of the changes in the water quality. Diatoms are divided into two major groups based on the structure and shape of the valves, the Centrics (Order: Biddulphiales) and the Pennates (Order: Bacillariales). Diatoms which reproduce efficiently are adapted to changing conditions by forming resting spores which remain on the bottom in shallow coastal waters until conditions favor their germination. Nitrogen, phosphorus, potassium, magnesium, oxygen, hydrogen, carbon, sulfur and iron are essential for the normal development of diatoms as to that of higher plants.

Item Type:	Article
Uncontrolled Keywords:	Algal bloom; Diatoma vulgaris; Dakshina Kannada
Subjects:	Marine Environment > Algal Blooms
Divisions:	CMFRI-Karwar CMFRI-Mangalore
Depositing User:	Arun Surendran
Date Deposited:	17 Nov 2023 08:50
Last Modified:	17 Nov 2023 08:50
URI:	http://eprints.cmfri.org.in/id/eprint/17700

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