Open Access Digital Repository of Ministry of Earth Sciences, Government of India

On the recurrence of Noctiluca scintillans bloom in Minnie Bay, Port Blair: Impact on water quality and bioactivity of extracts

Dharani, G and Abdul Nazar, AK and Kanagu, L and Venkateshwaran, P and Kumar, TS and Ratnam, K and Venkatesan, R and Ravindran, M (2004) On the recurrence of Noctiluca scintillans bloom in Minnie Bay, Port Blair: Impact on water quality and bioactivity of extracts. Current Science, 87 (7). pp. 990-994.

[img]
Preview
PDF
on the recurrence_current science.pdf - Published Version

Download (136kB) | Preview

Abstract

A Noctiluca scintillans bloom in the coastal waters of Minnie Bay, Port Blair was studied. Physico-chemical and biological properties of bloom-infested waters were monitored during the bloom period lasting five days. The bloom appeared as a green streak along the entire coastline of Minnie Bay, with cell counts of 17 103 cells/ l. The bloom appeared as a sudden spurt in cell number and persisted for a period of 48 h. The antibacterial properties of extracts from this algal species were also investigated. Conspicuously, the bloom inhibited the common resident phytoplankton species. Total suspended solids showed a marked increase during day-one of bloom compared to ambient levels. The bloom appeared to be limited by dissolved inorganic nitrogen species availability. The differential growth of phytoplankton reveals the involvement of specific trigger factors for such blooms. From the present viewpoint, micro-scale studies on hydrobiological factors preceding the onset of bloom would reveal what cycle of events lead to a bloom and the causal factors of such blooms. However, prediction of occurrence of such blooms and in situ measurements are practical difficulties to be addressed. Since a similar bloom was reported earlier in 2001, it is worthwhile to keep a watch and investigate as to whether there is any anthropogenic or environmental cause for the recurrence of the bloom.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences
Uncontrolled Keywords: algae; Noctiluca scintillans
Subjects: Oceanography > oceanography
Depositing User: NIOT Library
Date Deposited: 07 Dec 2013 22:33
Last Modified: 07 Dec 2013 22:33
URI: http://moeseprints.incois.gov.in/id/eprint/260

Actions (login required)

View Item View Item