. The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 . 400 500 600 WavQlQngth (nm.) 700 Figure upwelling and downwelling spectral irradiance at the substrate surface of a sandy area 7 m deep on Molasses Reef, Key Largo. The difference between upwelling and downwelling irradiance equals the light absorbed by the substrate (1 x 10^ q/cm^/s). Scans were calculated from sets of spectral irradiance data as described in the text. This fraction is somewhat higher than the earlier
. The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 . 400 500 600 WavQlQngth (nm.) 700 Figure upwelling and downwelling spectral irradiance at the substrate surface of a sandy area 7 m deep on Molasses Reef, Key Largo. The difference between upwelling and downwelling irradiance equals the light absorbed by the substrate (1 x 10^ q/cm^/s). Scans were calculated from sets of spectral irradiance data as described in the text. This fraction is somewhat higher than the earlier data from Jamaica but is within a range that could be considered acceptable, since the technique is in an early stage of development. Similar measurements made over a nearby grove of living coral on Molasses Reef revealed somewhat different and unexpected results. The values for 193
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