Abstract
Size influences the photosynthesis-irradiance (P-I) relationship in colonies of the branched reef-coral Pocillopora damicornis and in intact plants of the branched redmacroalga Acanthophora spicifera. The light saturation constant is proportional to size. Maximum net rate of oxygen production (net photosynthesis) per colony and nocturnal dark oxygen-uptake rate per colony (respiration) increase with increasing size, but the latter increases at a much lower rate. Therefore, the photosynthesis to respiration ratio increases with increasing canopy size. Large increases in chlorophyll per unit reef area also accompany increase in size. The initial slope (alpha) of the chlorophyll-specific P-I curve and assimilation number are inversely related to size. Integrated daytime oxygen production increases with size more rapidly than nighttime oxygen consumption. Consequently, net primary production of an entire colony or plant (or rate per unit area of reef) increases with increasing size of the canopy. Production efficiency also increases with size. The coral is rigid, symmetrical and highly organized. Chlorophyll distribution is more stratified in comparison to the macroalga. The coral shows higher photosynthetic efficiency, as would be expected according to the stratified production model of Odum et al. (1958). This research was conducted on specimens from Kaneohe Bay, Oahu, Hawaii, USA in 1981.
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Communicated by R. S. Carney, Moss Landing
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Jokiel, P.L., Morrissey, J.I. Influence of size on primary production in the reef coral Pocillopora damicornis and the macroalga Acanthophora spicifera . Mar. Biol. 91, 15–26 (1986). https://doi.org/10.1007/BF00397566
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DOI: https://doi.org/10.1007/BF00397566