SEASONAL MONITORING OF PHOTOSYNTHESIS CHARACTERISTICS OF SCLERACTINIAN CORALS IN THE NORTHERN SOUTH CHINA SEA
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摘要:
造礁珊瑚与虫黄藻共生是珊瑚礁最基本的生态特征。造礁珊瑚的生长乃至珊瑚礁生态系统的健康状况均与虫黄藻的光合作用密切相关。自然环境下造礁石珊瑚共生体光合作用特征研究仍相对缺乏，限制了珊瑚礁生态系统的健康评估与白化预警研究。在南海北部三亚鹿回头岸礁区选择鹿角杯形珊瑚（Pocillopora damicornis）、澄黄滨珊瑚（Porites lutea）和十字牡丹珊瑚（Pavona decussata）3种不同形态珊瑚，对其共生藻密度、叶绿素a含量和有效量子产量（ΦPSII）进行了1年的跟踪监测调查。分析结果显示：① 3种形态不同的珊瑚共生体光合作用特征具有明显的种间差异，澄黄滨珊瑚有着最高的共生藻密度和叶绿素a含量，但ΦPSII最低。② 澄黄滨珊瑚的共生藻密度最低值出现在冬季，而鹿角杯形珊瑚和十字牡丹珊瑚的共生藻密度最低值出现在春季。3种珊瑚的叶绿素a含量和ΦPSII均表现出了相似的季节变化，秋冬偏高，春夏偏低。③ 珊瑚共生体的光合作用特征具有显著的种间差异和季节变化，与珊瑚礁生态健康状况息息相关，因此在珊瑚礁生态监测与健康评估过程中，所应用的指标需要认真考虑石珊瑚的种间差异性和环境的动态变化。
Abstract:Systematic investigations of scleractinian corals in the natural environment are relatively lacking since the global decline of coral reefs. In this study, we selected three corals with typical morphology from Sanya, including Pocillopora damicornis, Porites lutea and Pavona decussata. We investigated the symbiodinium density, chlorophyll-a content and effective quantum yield (Φ PSII) for one year. The results show that: ① There are significant interspecific differences among the three corals. The scleractinian density and chlorophyll-a content of P. lutea are the highest, while the Φ PSII is the lowest. ② About symbiodinium density, the lowest value of P. damicornis appeared in winter, while the lowest value of P. damicornis and P. decussata appeared in spring. The chlorophyll-a content and Φ PSII of the three corals show similar pattern of seasonal changes, higher in autumn and winter, lower in spring and summer. ③ The photosynthetic characteristics of corals are related closely to the ecological health of coral reefs, and have clear interspecific differences and seasonal differences. Therefore, the interspecific differences and environmental dynamic changes of scleractinian corals, as an important indicator, need serious consideration in the coral reef monitoring and health assessment.
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