Journal of Tropical Oceanography >
Responses of two species of reef-building corals to acidification and dissolved organic carbon enrichment*
Received date: 2017-02-17
Request revised date: 2017-06-16
Online published: 2018-02-02
Supported by
National Natural Science Foundation of China Projects (31370499, 31370500)
National Key Technology Support Program (2014BAC01B03)
Copyright
Two common reef-building coral species in Luhuitou offshore areas, Favites complanata and Pavona decussata, were selected in our experiments. Continuous culture experiments (21 days) were conducted to evaluate the effects of acidification and dissolved organic carbon (DOC) enrichment on coral physiology. The results showed that: 1) acidification (pH 7.6) did not significantly affect the calcification rates and growth rates of these two coral species. However, in the treatment of DOC enrichment (524.03±78.42μmol•L-1), the coral calcification rates decreased by 67% and 47%, respectively; the growth rates decreased by 59% and 40%, respectively. In the combined effects of acidification and organic matter enrichment, the calcification rates decreased by 67% and 47%, respectively; the growth rates decreased by 59% and 40%, respectively, but the reduction was less than DOC enrichment alone. To some degree, these results reflected some antagonistic action. The maximum quantum efficiency (Fv/Fm) of these two corals all increased in the early, meanwhile; Fv/Fm of Favites complanata decreased first. 2) Favites complanata and Pavona decussata responded differently to acidification and organic matter enrichment, indicating the species would have different fates in a changing environment in future.
GUO Yajuan , ZHOU Weihua , YUAN Xiangcheng , LIAO Jianzu , JIANG Lei , HUANG Hui . Responses of two species of reef-building corals to acidification and dissolved organic carbon enrichment*[J]. Journal of Tropical Oceanography, 2018 , 37(1) : 57 -63 . DOI: 10.11978/2017018
Fig. 1 Two species of reef-building corals. (a) Favites complanata; and (b) Pavona decussate图1 两种造礁石珊瑚 |
Tab. 1 pH & DOC treatments表1 pH和DOC处理 |
组别 | pH | 溶解有机碳浓度/(μmol•L-1) |
---|---|---|
对照组 | 8.1 | 153.83±6.33 |
DOC组 | 8.1 | 524.03±78.42 |
酸化组 | 7.6 | 153.83±6.33 |
酸化和DOC组 | 7.6 | 524.03±78.42 |
Fig. 2 Effects of acidification and DOC enrichment on the calcification rates of Favites complanata and Pavona decussate. (a) Favites complanata; (b) Pavona decussata图2 酸化和DOC加富对板叶角蜂巢珊瑚(a)和十字牡丹珊瑚(b)钙化速率的影响 |
Fig. 3 Effects of acidification and DOC enrichment on the growth rates of Favites complanata and Pavona decussata. (a) Favites complanata; (b) Pavona decussate图3 酸化和DOC加富对板叶角蜂巢珊瑚(a)和十字牡丹珊瑚(b)生长速率的影响 |
Fig. 4 Effects of acidification and DOC enrichment on the photosynthesis capacity (Fv/Fm) of Favites complanata and Pavona decussata. (a) Favites complanata; (b) Pavona decussate图4 酸化和DOC加富对板叶角蜂巢珊瑚(a)和十字牡丹珊瑚(b)光合能力(Fv/Fm)的影响 |
The authors have declared that no competing interests exist.
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