• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2008, Volume: 1, Issue: 2, Pages: 1-9

Original Article

On the occurrence of Trichodesmium erythraeum (Ehr.) bloom in the coastal waters of Kalpakkam, east coast of India


A prominent discolouration of the Abstract: coastal waters by the blue-green alga Trichodesmium erythraeum was encountered in the east coast of Kalpakkam on 16th March 2007. The bloom persisted only for one day exhibiting visible alteration in physico-chemical properties and phytoplankton community structure of the coastal waters. The Trichodesmium cell density was 4.14 x 106 cells l-1, sharing 74.19 % of the total cell count (5.57 x 106 cells l-1). Only 24 species of phytoplankton were encountered on the day of bloom as compared to the highest number of 44 species in a single observation during pre- and post-bloom periods (1st March to 29th March). Concentration of chlorophyll-a and phaeopigments increased to about 20 times on the day of bloom compared to the pre-bloom values. An abrupt increase in ammonia, total nitrogen and phosphate was noticed on the day of bloom. The impact of this bloom on coastal water quality is reported.

Keywords: Trichodesmium erythraeum, algae, bloom, marine cyanobacterium, east coast, India. 


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