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Published on: June 13, 2020
Multivariate and geo-spatial approach for seawater quality of Chidiyatappu Bay, south Andaman Islands, India
Dilip Kumar Jha1, Nambali Valsalan Vinithkumar2, Biraja Kumar Sahu3
1Ocean Science and Technology for Islands, ESSO-NIOT, Ministry of Earth Science, Government of India, Chennai 600100, India; Andaman and Nicobar Centre for Ocean Science and Technology, Earth System Sciences Organisation (ESSO)-National Institute of Ocean Technology (NIOT), Ministry of Earth Sciences, Government of India, Port Blair 744103, India.
Abstract:
Chidiyatappu Bay is one of the least disturbed marine environments of Andaman & Nicobar Islands, the union territory of India. Oceanic flushing from southeast and northwest direction is prevalent in this bay. Further, anthropogenic activity is minimal in the adjoining environment. Considering the pristine nature of this bay, seawater samples collected from 12 sampling stations covering three seasons were analyzed. Principal Component Analysis (PCA) revealed 69.9% of total variance and exhibited strong factor loading for nitrite, chlorophyll a and phaeophytin. In addition, analysis of variance (ANOVA-one way), regression analysis, box-whisker plots and Geographical Information System based hot spot analysis further simplified and supported multivariate results. The results obtained are important to establish reference conditions for comparative study with other similar ecosystems in the region.
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