日本地球惑星科学連合2015年大会

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セッション記号 B (地球生命科学) » B-BG 地球生命科学・地圏生物圏相互作用

[B-BG21] 熱帯ー亜熱帯沿岸生態系における物質循環

2015年5月27日(水) 09:00 〜 10:45 304 (3F)

コンビーナ:*渡邉 敦(東京工業大学 大学院情報理工学研究科 情報環境学専攻)、本郷 宙軌(琉球大学理学部物質地球科学科)、宮島 利宏(東京大学 大気海洋研究所 海洋地球システム研究系 生元素動態分野)、座長:本郷 宙軌(琉球大学理学部物質地球科学科)、宮島 利宏(東京大学 大気海洋研究所 海洋地球システム研究系 生元素動態分野)

09:35 〜 09:50

[BBG21-03] 石垣島轟川河口の土地改良事業と低下したハマサンゴ骨格成長量の関連性

*岨 康輝1渡邊 剛2山野 博哉3林 誠二3 (1.東邦大学 理学部 化学科、2.北海道大学大学院 理学研究院、3.国立環境研究所)

Recent anthropogenic pollution has adversely impacted the physiology of reef-building corals. However, insufficient empirical data on the relationship between coral skeletal growth (calcification rate and skeletal density) and the degree of anthropogenic pollution are available. We conducted an analysis of Porites coral growth (N = 6) in the Shiraho Reef at the mouth of the Todoroki River on Ishigaki Island, Japan, over the 52 years from 1958 to 2009. Declines in calcification and skeletal density with no obvious sign of growth cessation or disease occurred in the 1970s-1980s, which coincided with the start of the public land improvement project on Ishigaki Island. The median calcification and skeletal density values were lower after the 1970s-1980s than those before the 1970s-1980s, and these differences were correlated with the degree and type of land use and development. Thus, the nutrient/sediment loads from the Todoroki River, which were related to the degree and type of land use and development, resulted in decreased calcification and skeletal density in the coral. The coral growth after the 1970s-1980s was not related to thermal stress. After the 1970s-1980s, the relationship between coral growth and environmental factors changed, which suggested that the coral physiological responses observed in the 1970s-1980s were related to the land improvement project.