Carbon distribution strategy of Aurelia coerulea polyps in the strobilation process in relation to temperature and food supply

作     者：WANG Nan LI Chaolun WANG Yantao FENG Song 王楠;李超伦;王彦涛;冯颂

作者机构：Key Laboratory of Marine Ecology and Environmental SciencesInstitute of OceanologyChinese Academy of Sciences Laboratory for Marine Ecology and Environmental ScienceQingdao National Laboratory for Marine Science and Technology Center for Ocean Mega-ScienceChinese Academy of Sciences 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2018年第36卷第6期

页      面：2216-2230页

核心收录：

学科分类：07[理学] 

基　　金：Supported by the National Key Research and Development Program of China(No.2017YFC1404400) the National Natural Science Foundation of China(Nos.41606127,41506144) the Aoshan Science and Technology Innovation Program of Qingdao National Laboratory for Marine Science and Technology(No.2016ASKJ02-2) 

主　　题：Aurelia coerulea temperature food supply carbon distribution strategy strobilation 

摘      要：Mass occurrences of moon jellyfish have been observed in coastal waters. Strobilation directly determines the initial population size of adult jellyfish, but energy distribution during the strobilation process is not well understood. In this study, strobilation was induced in polyp of Aurelia coerulea by elevating temperature. The different stages in the strobilation process, including polyp budding, strobilation and body growth, were investigated at six temperature levels(8, 10, 13, 15, 17 and 19°C) and five food supply levels(0, 30, 60, 100 and 150 μg C/L). The results showed that the duration of strobilation preparation stage(SP) remarkably decreased with increasing temperature. Food level positively af fected the production of buds and ephyrae and the body growth of parent polyps. Of the six temperatures tested, 13°C was optimal for strobilation. At 13°C, strobilation activity was enhanced, and this treatment resulted in the greatest energy distribution, highest ephyrae production and longest duration of strobilation stage(SS). Polyps tended to allocate 6.58%–20.49% carbon to buds with sufficient food supply regardless of temperature. The body growth of parent polyps was highest at lower temperatures and higher food levels. This study is the first to provide information on carbon-based energy distribution strategy in the polyp strobilation process. We concluded that budding reproduction is a lower-risk strategy for A. coerulea polyps to increase populations. Even during strobilation season, polyps prioritize budding, but at the optimal strobilation temperature, polyps utilize a portion of the energy stored for budding to release ephyrae. The body carbon content of parent polyps may be considered as strategic energy reserves, which could help to support budding activities and strobilation during harsh conditions.