Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 11, Issue 4, 2009; Page No.(809-818 )

CONTRIBUTION OF NUTRIENTS AND TRACE METALS BY MANGROVE VEGETATION AND IMPACT OF AQUACULTURE ON THE KAKINADA BAY ECOSYSTEM

Y. ANJANEYULU R.J. KRUPADAM AND S.S.VUTUKURU

Abstract

In the Godavari estuarine system near Kakinada Bay, Andhra Pradesh, East Coast of India, the mangroves spread over an area of 22, 450 ha of which the highly productive Coringa mangroves adjacent to the bay cover an area of 6,600 ha. The average annual litter production (dry weight) of this mangrove ecosystem was found to be of 896 g m2yr1 with the contribution of C in the form of leachate to a tune of 224 g m-2yr-' and an equal amount of particulate detritus besides 4.5 g m-2yr-1 as leachate to the ecosystem. High concentrations of Mn, Fe, Ni, Cu and Zn were found during the monsoon. Semi- intensive aquafarming (- 3,500 hectares) resulted in soil salinization, deteriorated water quality, loss of habitat biodiversity besides environmental degradation of this fragile estuarine ecosystem.

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