. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. astreoides colonies on Curacao reefs to measured changes in the distribution of underwater radiance, and who observed the expected morphological changes in transplanted Montastrea annularis in computer simulations of coral growth based on empirical measurements of light distribution and on simple assumptions about the effects of liqht on calcification. As part of a larger study of the ecology and v
. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. astreoides colonies on Curacao reefs to measured changes in the distribution of underwater radiance, and who observed the expected morphological changes in transplanted Montastrea annularis in computer simulations of coral growth based on empirical measurements of light distribution and on simple assumptions about the effects of liqht on calcification. As part of a larger study of the ecology and variation of the genus Porites (Brakel, 1976), I collected detailed information on the colony shape and distri- bution of Porites astreoides on Jamaican reefs. These data were supplemented by relatively simple, but objective and repeatable, estimates of two important depth- related variables, water movement and irradiance. The results presented below reveal that the generally recognized depth-related morphological trend is more complex than expected. METHODS Study area Observations and collections were made on the north coast of Jamaica at Discovery Bay. The structure and zonation of the reefs of this region have been described by Goreau (1959) and Goreau & Goreau (1973). I selected 7 different reef habitats as study sites, encompassing a depth range of 27 m (Fig. 1). Four sites were located on the exposed seaward side of the reef crest; 3 additional were situated in the sheltered, more turbid waters leeward of the fringing At each study site the coral fauna was surveyed in quadrats along transect sites reef, lines perpendicular to the slope of the following features were recorded: (1) colony was growing; (2) the exposure of from 0 (fully exposed, open to water on crevice); and (3) the shape of the colony, measurements described below. Irradiance estimates for each colony Light measurements were made at all reef. For every Porites encountered, the the slope of the substrate
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