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      Permanent link:
      https://www.ias.ac.in/article/fulltext/anml/095/03/0325-0339

    • Keywords

       

      Mining rejects; clam bed; benthic fauna; environmental variability; faunal diversity; biomass

    • Abstract

       

      Comparison of two clam beds and associated benthic fauna, in Mandovi and Cumbarjua canal estuarine system of Goa, severely affected by massive inputs of mining rejects, revealed that, in less than 10 years (1972–73 to 1982–83), high biotic variability induced by increasing environmental stress has caused irreversible ecosystem instability. Reduced dissolved oxygen concentration; high suspended solids and blanketing of bottom deposits by mining rejects, has resulted in more than 70% reduction in clam production; near extinction of resident fauna and the appearance of a low diversity bottom fauna, comprising of tolerant but vagrant species. Ever increasing entry of mining rejects, which has reduced the healthy and highly productive estuarine environment of 1972–73, into an impoverished biotope, in less than 10 years, unless prevented will result in the total extinction of estuarine life in the near future.

    • Author Affiliations

       

      A H Parulekar1 Z A Ansari1 B S Ingole1

      1. National Institute of Oceanography, Dona Paula, Goa - 403 004, India
    • Dates

       
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