경산호, Montipora digitata 에 대한 LED (Light Emitting Diode)의 성장 효과

Abstract

Montipora digitata is a major species that forms a reef builder as well as having high ornamental value due to its wide variety of colors, its ecological value is very high. Recently, the number of natural populations is decreasing due to climate change, and the need for more efficient artificial production system is increasing. In this study, we tried to derive the light condition that induces the optimum growth of M. digitata using LED light. A control group irradiated with white composite LED light using M. digitata fragment (average weight of n = 30, 22.63 g ± 0.87) and 4 groups of 4 wavelengths (405, 465, 520 and 640 nm) growth test was carried out by dividing into experimental groups. M. digitata had the highest growth rate of 3.1% (p <0.001 compared to white LED irradiation) at 465 nm wavelength, The density of the symbiotic algae isolated from M.digitata and the total amount of chlorophyll (Chlorophyll ɑ + Chlorophyll c2) also showed the highest increase at 465 nm. In order to determine the optimum light intensity required for the growth of M.digitata, we have experimented with LEDs with a wavelength of 465 nm with four kinds of light intensities (60, 125, 250, 400 μ mol photons m-2 s-1). Growth was proportional to the amount of light, and the highest growth rate (4.16 %, p <0.001) was induced at 400 μ mol photons m-2 s-1. The density of isolated Symbiodinium sp C15 and the total amount of chlorophyll after light intensity experiment also showed the greatest increase at 465 nm, indicating a very high correlation with growth. In conclusion, 465nm was the most effective wavelength for the growth of M. digitata, and the higher the light intensity, the higher the growth rate. This seems to be related to the characteristics of heat resistance and light resistance of Symbiodinium sp C15 symbiotic to M. digitata. The light condition of LED derived from this study can be used not only for display of coral, but also for growth, and it is expected to contribute to the increase of coral productivity by utilizing it in mass production system in the future.