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Title: Some Effects of Light on Coral Growth 
Author: Roth, Ariel A.; Clausen, Conrad D.; Yahiku, Paul Y.; Clausen, Venus E.; Cox, Walter W.
Date: 1982-01
Publisher: University of Hawai’i Press
Citation: Roth AA, Clausen CD, Yahiku PY, Clausen VE, Cox WW. 1982. Some effects of light on coral growth. Pac Sci 36(1): 65-81.
Abstract: The rate of coral growth under varied light regimes was tested
using 45Ca uptake while temperature was held constant. Pocillopora damicornis
and Acropora formosa, respectively, were used in Hawaii and Enewetak
under natural and artificial light conditions. Light intensity and spectral
distribution patterns were determined for all experiments.
Pocillopora damicornis was tested under different natural light conditions
and total darkness. Light enhances calcification within limits. Calcification was
shown to have a negative regression with light at 380 nm when that light was
partitioned from visible light (400-800 nm), thus indicating longwave ultraviolet
Acropora formosa held for 6 hr of pretreatment under natural light conditions
during the day or in the dark at night calcifies faster during the day
than at night. This testing, which was conducted for 20 min under either dark
or light conditions, did not show a statistically significant difference between
dark or light testing conditions.
This same species was pretreated for 4 hr with dark, low light, and high light
intensities at the same time of the day; then the samples were immediately
tested for calcification rate for 20 min under dark conditions. Those pretreated
under high light calcified faster than those pretreated under low or dark
conditions, indicating a light-dependent lag effect.
ISSN: 0030-8870

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