Abstract
Heavy metal contents of the corals collected from the Lakshadweep archipelago are discussed in the light of allometric variations. Plots of log flesh weight versus log flesh metal concentration exhibited negative correlations for all the nine metals studied. Metals with rapid exchange rate are likely to show such negative correlation and in such situations the elimination rate far exceeds the metal accumulation rate. Similar plots in the skeletal component showed positive correlations. The only linear relationships were observed in log flesh density versus log partition coefficient plots. Comparative flesh enrichment of metals were found to decrease against increasing flesh weights (for both essential and non-essential metals), indicating a regulation of flesh metal burden beyond certain limits. In the skeletal component, anthropogenic input as well as competitive interactions between metal ions having radii similar to that of Ca2+ paves way for metal adsorption in calcite/aragonite skeletal lattice of corals.
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