Growth of staghorn coral Acropora aspera (Dana) (Scleractinia: Acropridae) in relation to environmental factors at Kavaratti atoll (Lakshadweep Islands), India

Abstract

Skeletal extension and calcification were measured over 2 years in branches of the staghorn coral Acropora aspera from a shallow-water site. Correlations were made between growth parameters and environmental variables monitored over the same period. Calcification varied significantly (9.4-17.4 mg. 28d(-1)) than skeletal extension (3.1-4.7 mm. 28d(-1)) and unlike extension, it varied significantly between seasons with lowest values during southwest monsoon (June-September). seasonal reduction in calcification was probably associated with the reduced availability of light due to increased cloud cover and sediments in water. Extension, however, seemed to be under the direct influence of currents and sediments. The effect of environmental factors seemed more critical to calcification.