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Starvation of the Respiratory Metabolism and Locomotion of Aurelia aurita s.l. ephyrae

Open Journal of Marine Science 2021年第1期11卷 1-16页

作者： Zhilu Fu Shin-Ichi Uye Key Laboratory of Protection and Utilization of Marine Resources Guangxi University for Nationalities Nanning China Graduate School of Biosphere Science Hiroshima University Higashi-Hiroshima Japan

Blooms of the scyphozoan jellyfish Aurelia aurita are greatly regulated by the survival rate of planktonic ephyrae. The ecophysiology of ephyrae is poorly studied compared with polyps and medusae. As extremely strong starvation resistance and recovery capability of A. aurita ephyrae may due to its low metabolic rate as well as starvation may reduce the swimming ability of ephyrae which may lead to the higher predation loss, the effects of temperature and starvation on their respiration and pulsation rates were examined. In this study, ephyrae under different starvation conditions were measured by a fluorescence-based DO meter after 72 h incubation. And the pulsation rates were measured at every 10-d interval in 1-liter plastic bottle by a hand-held counter. The results showed that the mean respiration rates of newly released ephyrae were 0.24, 0.24 and 0.19 μl O2 ephyra-1 d-1 at 15°C, 12°C and 9°C, respectively, and the rates tended to decrease with increasing starvation duration. Carbon weight-specific respiration rates did not change significantly with starvation duration. The dry weight-specific respiration rates of newly released A. aurita ephyrae (i.e., 11.7-14.6 μl O

关键词： Aurelia aurita ephyrae Starvation Respiration Pulsation

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Molecular identifi cation and population diff erentiation of Aurelia *** in sea cucumber aquaculture ponds of northern China

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Journal of Oceanology and Limnology 2021年第3期39卷 989-996页

作者： Saijun PENG Qingqing LIU Lei WANG Tingting SUN Tamara SHIGANOVA Zhijun DONG Muping Coastal Environment Research Station Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Shirshov Institute of Oceanology Russian Academy of Sciences Moscow 117997 Nakhimovskyi pr.36Russia

Aurelia *** have been reported to form blooms in sea cucumber aquaculture ponds in the Bohai and Yellow *** identify the species,we carried out a genetic analysis of Aurelia *** and medusae based on mitochondrial 16 S rRNA *** offour Aurelia *** populations were collected in sea cucumber aquaculture ponds and samples offour Aurelia *** populations were collected in coastal *** a BLASTn search,we found that both the ephyrae collected in the aquaculture ponds and medusae collected in coastal waters belong to Aurelia *** haplotypes were recovered from the 16 S rRNA *** overall haplotype diversity and nucleotide diversity of the 166 *** individuals were 0.686%and 0.329%,respectively,indicating high haplotype diversity and low nucleotide ***,the haplotype diversity of ephyrae populations were generally lower than that of medusae populations with close sampling *** genetic differentiation between ephyrae populations collected in the sea cucumber aquaculture ponds and *** medusae collected in coastal waters was not significant,suggesting the ephyrae populations in the sea cucumber culture ponds were part of the same genetic group as the medusae populations in the coastal *** analysis of the 16 S rRNA region revealed that there was no significant correlation between the haplotypes and the geographic distribution of *** fixation index values showed significant genetic differentiation and limited gene flow between *** population of Weifang and other locations.

关键词： Aurelia coerulea medusae ephyrae 16S r RNA gene analyzes genetic differentiation genetic variability

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