International Journal of Environmental Sciences

Volume 2 Issue 3 2012           Pages:1543- 1552

Seasonal variation in diatoms in response to physico-chemical characteristics of coastal waters of Uttara Kannada district, West Coast of India

Author Information:

Sushanth V.R - Department of Biosciences, Mangalore University, Mangalagangothri – 574 199

Rajashekhar M - Department of Biosciences, Mangalore University, Mangalagangothri – 574 199

ABSTRACT
The present study was undertaken to know the diatom distribution in different seasons in response to physico-chemical properties of Arabian Sea water in the Uttara Kannada District, Karnataka over a period of one year from November 2009-October 2010. The study revealed the presence of 55 species of diatoms, highest number was recorded  in post-monsoon and the least in monsoon season. The major genera belong to Amphora, Chaetoceros, Coscinodiscus, Navicula, Pleurosigma, Achnanthes, Cymbella, Mastogloia, Nitzschia, Biddulphia, Diploneis and Licmophora. Bloom of Asterionella japonica was observed during early monsoon season. The physico-chemical parameters studied showed noticeable seasonal variations, which may be attributed to the local climatic conditions and water exchange mechanisms. The physico-chemical parameters like temperature, salinity, conductivity and nutrients were found to influence the occurrence of diatoms.

Keywords : Diatoms, Physico-chemical properties, Seasonal variations, Arabian Sea, Uttara Kannada District.

DOI: 10.6088/ijes.00202030039


© 2012 Copyright Sushanth V.R and Rajashekhar M, licensee IPA.This is an open access article distributed under the Creative Commons Attribution License (2.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The electronic version of the article can be downloaded below.

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