Journal of Tropical Oceanography ›› 2022, Vol. 41 ›› Issue (6): 114-124.doi: 10.11978/2022007CSTR: 32234.14.2022007

• Marine Biology • Previous Articles     Next Articles

Effects of diurnal changes of ocean acidification and hypoxia on the ephyrae of Rhopilema esculentum

WUZHONG Qiyue1,2,3(), WANG Lei3(), CHEN Lifei4, LI Xiubao1,2(), DONG Zhijun3   

  1. 1. College of Marine Science, Hainan University, Haikou 570228, China
    2. State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou 570228, China
    3. Muping Coastal Environment Research Station, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
    4. Jinyang Aquatic Product Original Seed Farm, Yancheng 224351, China
  • Received:2022-01-13 Revised:2022-03-17 Online:2022-11-10 Published:2022-03-25
  • Contact: WANG Lei, LI Xiubao E-mail:wuzhongqiyue@163.com;lwang@yic.ac.cn;xiubaoli@hainanu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(Y911051021)

Abstract:

The anthropogenic aggravation of global climate change is an important environmental problem, and the imbalance between pCO2 and dissolved oxygen in the ocean and eutrophication have aggravated the acidification and hypoxia of many coastal ecosystems. Rhopilema esculentum is one of the most important fishery resources in China, which has edible value and potential medicinal value. In this study, the physiological responses of the ephyrae of R. esculentum under the stress of ocean acidification and hypoxia and their circadian rhythm changes were evaluated: the ephyrae was exposed to two levels of pH (acidified pH 7.6; normal pH 8.1) and two dissolved oxygen (DO) levels (hypoxia 2 mg·L-1; normoxic 7 mg·L-1) for 7 days. The stress factors remained constant or fluctuating, and the bell diameter, pulsation rates and activities of acid-base balance, immunity and antioxidation related enzymes of ephyrae were measured. The results showed that the ocean acidification and hypoxia affected the physiological metabolism, growth and development of R. esculentum ephyrae in different degrees, and there was a partial antagonism between acidification and hypoxia. The effects of diurnal fluctuating exposure mode to R. esculentum ephyrae was more harmful than that of constant exposure mode.

Key words: Rhopilema esculentum, ocean acidification, ocean hypoxia, diurnal change, physiological ecology

CLC Number: 

  • Q958