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One of the most difficult problems for coral conservation is to find a sensitive physiological parameter to assess the health of living coral. In searching for a suitable index, ATP concentration in several species of coral under different natural and experimental conditions was studied from 1986 to 1989 in the coastal waters of southern Taiwan (21°56'N, 120°44'E). Interspecific vanation in ATP concentration in 6 coral species ranged from 8.2 t 1.3 to 52.6 IT 14.8 pg g-l. In an experiment of shortterm desiccation stress, ATP content in Acropora hyacinthus dropped drastically from 67.0 + 13.7 to 7.9 k 6.1 pg g-' During a bleaching event resulting from a natural disturbance, ATP concentration in A. hyacinthus dropped significantly but recovered gradually to normal values several months later. An annual survey of ATP variation in A. formosa showed a high peak between December and April with lower values in other months, perhaps in response to fluctuating temperature. In view of the significant rapid response of coral ATP content to stress and the rise in concentration during a recovery phase of months, the amount of ATP in living coral could be a feasible parameter for monitoring environmental stress in living coral.

Feasibility of using ATP as an index for environmental stress on hermatypic coral