海水酸化和升温对两种造礁石珊瑚生长和钙化的影响*

doi:10.11978/2022171

Abstract

Abstract:

To explore the effects of ocean warming and acidification on coral growth and calcification rate, two widespread coral species, Pocillopora damicornis and Galaxea fascicularis, in the Luhuitou area of the Sanya Bay, were selected for a 28-days controlled incubation experiment. With the interactive treatments of temperatures and pCO₂, our results indicated that corals were significantly affected by seawater acidification. Moreover, acidification affected strongly the growth rate of G. fascicularis and the calcification rate of P. damicornis. The chlorophyll fluorescence index (F_v/F_m) of the symbiotic zooxanthellae in P. damicornis was significantly higher than G. fascicularis. Interestingly, the quantitative study showed that there was an antagonistic effect between temperature and pH at some levels, which could effectively alleviate coral bleaching. Thus, we concluded that the growth and calcification rate exhibited interspecific specificity in response to seawater warming and acidification.

Key words: Pocillopora damicornis, Galaxea fascicularis, acidification, warming, growth, calcification

ZHOU Weihua, LI Yingxin, GUO Yajuan, HUO Jiaxin, SONG Yan, ZHU Qing, YUAN Xiangcheng, LIU Sheng, HUANG Hui. Effects of ocean acidification and warming on the growth and calcification of two reef-building corals*[J].Journal of Tropical Oceanography, 2024, 43(3): 49-57.

Figures/Tables 8

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References 39

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pH	温度/℃	盐度/‰	TA/ (μmol·L^-1)	DIC/(μmol·L^-1)	pCO₂ /μatm	Ω_A
8.1±0.14	27±1	34±0.02	2239±13	1888	321	3.87
	29±1	34±0.02	2239±13	1869	318	4.12
	31±1	34±0.02	2239±13	1859	317	4.25
7.7±0.16	27±1	34±0.02	2225±14	2091	960	1.83
	29±1	34±0.02	2225±14	2079	962	1.97
	31±1	34±0.02	2225±14	2073	963	2.04
7.4±0.18	27±1	34±0.02	2224±11	2197	2043	0.98
	29±1	34±0.02	2224±11	2189	2056	1.06
	31±1	34±0.02	2224±11	2185	2062	1.10

珊瑚物种	处理组	生长速率 /(mg·cm^-2·h^-1)
珊瑚物种	处理组	pH 8.1→7.7(轻度)	pH 7.7→7.4(中度)	pH 8.1→7.4(深度)
鹿角杯形珊瑚	27℃(处理1)	-0.0051	0.0085	0.0034
	29℃(处理2)	-0.0013(+)	0.0040(-)	0.0028(-)
	31℃(处理3)	0.0000(++)	0.0015(- -)	0.0016(- -)
丛生盔形珊瑚	27℃(处理1)	-0.0061	-0.0068	-0.0129
	29℃(处理2)	0.0036(+)	0.0002(+)	0.0038(+)
	31℃(处理3)	0.0061(++)	-0.0079(- -)	-0.0009(+)

珊瑚物种	处理组	生长速率 /(mg·cm^-2·h^-1)
珊瑚物种	处理组	27℃→29℃(轻度)	29℃→31℃(中度)	27℃→31℃(深度)
鹿角杯形珊瑚	8.1(处理1)	0.0069	0.0020	0.0088
	7.7(处理2)	0.0107(+)	0.0033(+)	0.0140(+)
	7.4(处理3)	0.0062(- -)	0.0007(- -)	0.0070(- -)
丛生盔形珊瑚	8.1(处理1)	-0.0117	-0.0116	-0.0233
	7.7(处理2)	-0.0020(+)	-0.0091(+)	-0.0111(+)
	7.4(处理3)	0.0050(++)	-0.0163(- -)	-0.0112(+)

珊瑚物种	处理组	钙化速率 /(μmol·cm^-2·h^-1)
珊瑚物种	处理组	pH 8.1→7.7(轻度)	pH 7.7→7.4(中度)	pH 8.1→7.4(深度)
鹿角杯形珊瑚	27℃(处理1)	-0.0366	0.0322	-0.0043
	29℃(处理2)	-0.0049(+)	0.0737(+)	0.0688(+)
	31℃(处理3)	0.0310(++)	0.0409(+)	0.0719(++)
丛生盔形珊瑚	27℃(处理1)	0.0186	0.0518	0.0704
	29℃(处理2)	0.0026 (-)	-0.0051(-)	-0.0025(-)
	31℃(处理3)	-0.0785(--)	0.0340(-)	-0.0445(--)

珊瑚物种	处理组	钙化速率 /(μmol·cm^-2·h^-1)
珊瑚物种	处理组	27℃→29℃(轻度)		29℃→31℃(中度)		27℃→31℃(深度)
鹿角杯形珊瑚	8.1(处理1)	-0.0432	-0.0742		-0.1173
	7.7(处理2)	-0.0272(+)	0.0069(+)		-0.0202(+)
	7.4(处理3)	0.0298(++)	-0.0322(++)		-0.0024(++)
丛生盔形珊瑚	8.1(处理1)	-0.0386	-0.0097		-0.0483
	7.7(处理2)	-0.0070(+)	0.0262(+)		0.0192(+)
	7.4(处理3)	0.0345(++)	-0.0066(+)		0.0279(++)

Effects of ocean acidification and warming on the growth and calcification of two reef-building corals*

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