珊瑚脂质是其共生虫黄藻密度降低时的重要能量来源

门征; 陈汉吉; 许慎栋; 余克服; 莫洪燕

doi:10.12284/hyxb2023022

珊瑚脂质是其共生虫黄藻密度降低时的重要能量来源

doi: 10.12284/hyxb2023022

门征^1,,
陈汉吉¹,
许慎栋^{1, 2, 3, ,},
余克服^{1, 3},
莫洪燕¹

1.
广西大学海洋学院广西南海珊瑚礁研究重点实验室，广西南宁 530004
2.
中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室，山东烟台 264003
3.
南方海洋科学与工程广东省实验室（珠海），广东珠海 519082

基金项目: 青岛海洋科学与技术国家实验室创新团队建设项目（MGQNLM-TD201806）；广西科技项目（2020GXNSFAA297026）；国家自然科学基金（42090041，42030502，41663001）。

详细信息

作者简介:
门征（1997-），女，河南省南阳市人，主要从事珊瑚礁地球化学研究。E-mial: zhengmen2021@163.com

通讯作者:
许慎栋（1987-），男，副教授，主要从事滨海湿地及珊瑚礁区碳循环研究。E-mial: sdxu@gxu.edu.cn

① 审图号为GS(2020)4618号。
中图分类号: Q178.53；Q143⁺.2
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出版历程
- 收稿日期: 2022-05-20
- 修回日期: 2022-09-05
- 网络出版日期: 2022-09-09
- 刊出日期: 2023-01-09

Coral lipids are an important energy source when their symbiotic zooxanthellae density decreases

Men Zheng^1
,,
Chen Hanji¹,
Xu Shendong^{1, 2, 3
, ,},
Yu Kefu^{1, 3},
Mo Hongyan¹

1.
Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China
2.
Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
3.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

摘要

摘要: 近年来珊瑚白化现象日益严峻。白化意味着珊瑚共生虫黄藻密度的降低，然而目前关于珊瑚体内的脂质在虫黄藻密度降低时对维持能量供给稳定的意义尚不清楚。本研究以2020年3月和6月在西沙群岛采集的帛琉蜂巢珊瑚（Favia palauensis）和澄黄滨珊瑚（Porites lutea）样品为材料，通过生理参数（虫黄藻密度、脂质含量）与地球化学指标（虫黄藻的稳定氮同位素δ¹⁵N_z值）相结合的方法，探讨了珊瑚脂质对虫黄藻密度及其光合作用强度变化的响应。结果显示，夏季两种珊瑚的虫黄藻密度和δ¹⁵N_z值均显著下降，意味着夏季虫黄藻密度降低导致了其光合作用强度的降低。与此同时，两种珊瑚的脂质含量也显著下降，并且脂质含量与虫黄藻密度、δ¹⁵N_z值之间均呈正相关关系，这说明珊瑚脂质含量与虫黄藻光合作用强度的变化之间存在耦合关系。当光合作用强度降低时，珊瑚可以通过消耗其自身储存的脂质更好地维持能量供给的稳定，这对提高环境胁迫的适应能力以及抗白化能力具有重要意义。
- 珊瑚 /
- 能量供给 /
- 虫黄藻 /
- 脂质 /
- 氮同位素
Abstract: Coral bleaching has become increasingly severe in recent years. Bleaching means a decrease in the symbiotic zooxanthellae density in corals. However, the significance of lipids in corals to maintain the stability of energy supply when the zooxanthellae density decreases remains unclear. Favia palauensis and Porites lutea samples collected in the Xisha Islands in March and June 2020 as materials were used in this study. By combining physiological parameters (zooxanthellae density and lipid content) with geochemical indexes (stable nitrogen isotope δ¹⁵N_z value of zooxanthellae), the response of coral lipids to the changes in zooxanthellae density and photosynthetic intensity was investigated. The results showed that the zooxanthellae density and δ¹⁵N_z value of two genera of corals decreased significantly in summer, implying that the decrease in zooxanthellae density in summer resulted in a decrease in their photosynthetic intensity. At the same time, the lipid content of the two genera of corals also decreased significantly, and the lipid content was positively correlated with zooxanthellae density and δ¹⁵N_z value, indicating that there was a coupling relationship between the coral lipid content and the changes of the photosynthetic intensity of zooxanthellae. When photosynthesis intensity decreases, coral can better maintain the stability of energy supply by consuming their own stored lipids, which is of great significance to improve their adaptability to environmental stress and bleaching resilience.
- coral /
- energy supply /
- zooxanthellae /
- lipids /
- nitrogen isotopes
注释:

1) ① 审图号为GS(2020)4618号。

HTML全文

图 1 本文研究区域^①（a）和具体采样点（b）

Fig. 1 The study area (a) and specific locations of sampling (b) in this paper

下载: 全尺寸图片幻灯片

图 2 两种珊瑚虫黄藻密度（a）、脂质含量（b）、δ¹⁵N_z值（c）的季节差异

每个条形图上的数字表示珊瑚样本数量；星号表示两种珊瑚每个参数季节间的差异显著（p<0.05）

Fig. 2 Seasonal differences in zooxanthellae density (a), lipid content (b) and δ¹⁵N_z value (c) of two genera of corals

The number on each bar chart represents the number of coral samples; the asterisks indicate significant seasonal differences in each parameter of two genera of corals (p<0.05)

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图 3 两种珊瑚虫黄藻密度与δ¹⁵N_z值的关系

Fig. 3 Relationship between zooxanthellae density and δ¹⁵N_z value of two genera of corals

下载: 全尺寸图片幻灯片

图 4 珊瑚样本虫黄藻密度与脂质含量的关系（a）及珊瑚样本δ¹⁵N_z值与脂质含量的关系（b）

Fig. 4 Relationship between zooxanthellae density and lipid content of coral samples (a) and relationship between δ¹⁵N_z value and lipid content of coral samples (b)

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表 1 两种珊瑚在3月和6月虫黄藻密度、脂质含量、δ¹⁵N_z值的属种差异

Tab. 1 Interspecific differences in zooxanthellae density, lipid content and δ¹⁵N_z value of two genera of corals in March and June

月份	样品数量	参数	差异值
3月	15	虫黄藻密度	t=0.91
		虫黄藻密度	p=0.38
		脂质含量	t=−0.69
		脂质含量	p=0.50
		δ¹⁵N_z值	t=−1.04
		δ¹⁵N_z值	p=0.32
6月	30	虫黄藻密度	t=1.17
		虫黄藻密度	p=0.25
		脂质含量	t=0.45
		脂质含量	p=0.65
		δ¹⁵N_z值	t=0.19
		δ¹⁵N_z值	p=0.85

下载: 导出CSV

表 2 两种珊瑚虫黄藻密度、脂质含量、δ¹⁵N_z的季节差异

Tab. 2 Seasonal differences in zooxanthellae density, lipid content and δ¹⁵N_z of two genera of corals

参数	属种	样品数量	差异值
虫黄藻密度	F. palauensis	27	t=2.53
	F. palauensis	27	p<0.05
	P. lutea	18	t=2.13
	P. lutea	18	p<0.05
脂质含量	F. palauensis	27	t=5.39
	F. palauensis	27	p<0.001
	P. lutea	18	t=3.50
	P. lutea	18	p<0.05
δ¹⁵N_z值	F. palauensis	27	t=2.71
	F. palauensis	27	p<0.05
	P. lutea	18	t=3.73
	P. lutea	18	p<0.05

下载: 导出CSV

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