Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater

Anoop, A K and Krishnakumar, P K and Rajagopalan, M (2007) Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater. Estuarine, Coastal and Shelf Science, 71 (3-4). pp. 641-646.

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Abstract

The incidence of a large scale Trichodesmium erythraeum bloom along the southwest coast of India (Arabian Sea) observed in May 2005 is reported. Around 4802 filaments of T. erythraeum ml−1 seawater was observed and a colony consisted of 3.6 × 105 cells. The bloom was predominant off Suratkal (12° 59′N and 74° 31′E) with a depth of about 47 m, covering an area of 7 km in length and 2 km width. The concentrations of Zinc, Cadmium, Lead, Copper, Nickel and Cobalt were determined in samples collected from the bloom and non-bloom sites using stripping voltammetry. The observed hydrographical and meteorological parameters were found to be favorable for the bloom. The concentrations of Zinc, Cadmium and Nickel were found to be higher at bloom stations, while the concentrations of Lead, Copper and Cobalt were found to be very low at bloom stations. Elevated concentrations of Cadmium and Cobalt were observed at Valappad mainly due to the decomposition of detrital material produced in the bloom. Statistically significant differences (P > 0.01) in metal concentrations between the bloom and non-bloom stations were not observed except for Copper. Metals such as Lead, Copper and Cobalt were removed from the seawater at all places where bloom was observed. Cadmium was found to be slowly released during the decaying process of the bloom.

Item Type:Article
Official URL/DOI:http://www.elsevier.com/locate/ecss
Uncontrolled Keywords:Trichodesmium erythraeum; Trichodesmium erythraeum bloom; southwest coast of India; Arabian Sea; trace metal concentrations
Subjects:Algae
Divisions:CMFRI-Cochin > Fishery Environment
ID Code:5762
Deposited By:Arun Surendran
Deposited On:28 Oct 2010 15:46
Last Modified:28 Oct 2010 15:46

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