The effect of light on the growth rate of intertidal Acropora pulchra (Brook) from Phuket,Thailand, lat. 8°N |
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Authors: | Tor Strömgren |
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Institution: | (1) The Museum, University of Trondheim, N-7000 Trondheim, Norway |
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Abstract: | Series of apices of Acropora pulchra from an intertidal reef at Phuket, Thailand, were grown at different depths in the sea, and the length growth was monitored at 12–24 h intervals with laser diffraction. The growth rates of actively growing apices were normally distributed and showed a high variability, with an average coefficient of variation of 58%. There was a highly significant difference in average growth rate between adjacent colonies. A significant linear relationship was found between irradiance and length growth, with a saturating level at 300–400 Wm-2. At 1000 Wm-2 length growth was significantly reduced. Under normal daylight conditions, day and night growth rates were equal. |
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