Effects of duration at low temperature on asexual reproduction in polyps of the scyphozoan Nemopilema nomurai (Scyphozoa: Rhizostomeae)

	Effects of duration at low temperature on asexual reproduction in polyps of the scyphozoan Nemopilema nomurai (Scyphozoa: Rhizostomeae)
	Feng, Song 1,2; Zhang, Fang 1; Sun, Song 1,3; Wang, Shiwei 3; Li, Chaolun 1
刊名	HYDROBIOLOGIA
	2015-07-01
卷号	754 期号:1 页码:97-111
关键词	Jellyfish Bloom Podocyst Strobilation Feeding Frequency
文献子类	Article
英文摘要	In recent decades, massive outbreaks of the giant jellyfish, Nemopilema nomurai have been appearing frequently in coastal seas of China. In the life cycle of N. nomurai, asexual reproduction by its benthic polyps may largely determine the jellyfish population size, and it was thought that asexual reproduction leading to medusae might be affected by differences in the duration at low winter temperature on different parts of the coast. To test this hypothesis, polyps were first stored at low temperature for two different durations, 5A degrees C for either 40 or 117 days. They were then maintained at seven temperatures, (maintained at 5A degrees C, and separately elevated to 10, 13, 16, 19, 22, 27A degrees C) reached by raising the temperature 1A degrees C every 2 days from 5A degrees C, as well as a control temperature: 5A degrees C. Polyps were fed with three frequencies (once per 5 days, once per 10 days, and unfed, prey concentration, 0.1 mgC l(-1), being supplied once). The percentages of polyps strobilating, strobilation duration, ephyra and podocyst production were recorded. The results showed that longer duration at low temperature accelerated strobila formation at warmer temperature, as well as significantly enhancing podocyst production, but not for the strobilation percentage or ephyra production. Temperature had a marked influence on strobilation percentage, as well as on ephyra and podocyst production. The optimum temperature for strobilation by N. nomurai polyps ranged from 10 to 13A degrees C. The maximum numbers of ephyrae appeared after polyps had been stored at longer low temperature then warmed to 10A degrees C and fed once per 5 days, while the maximum production of podocysts occurred in polyps warmed to 27A degrees C and fed once per 5 days. We conclude that longer duration at low temperature in winter, a continuous 10-13A degrees C period in spring, and increasing food supply all accelerate the strobila formation, increase jellyfish production and are tend to increase blooms of N. nomurai medusae.
WOS关键词	CYANEA-NOZAKII KISHINOUYE ; EAST CHINA SEA ; NORTH-SEA ; YELLOW SEA ; INTERANNUAL VARIABILITY ; CTENOPHORE BLOOMS ; JELLYFISH BLOOMS ; PODOCYSTS ; WATERS ; STROBILATION
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000355625400008
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/67895]
专题	中国科学院地理科学与资源研究所
通讯作者	Sun, Song
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.Chinese Ecosyst Res Network, Jiaozhou Bay Marine Ecosyst Res Stn, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Feng, Song,Zhang, Fang,Sun, Song,et al. Effects of duration at low temperature on asexual reproduction in polyps of the scyphozoan Nemopilema nomurai (Scyphozoa: Rhizostomeae)[J]. HYDROBIOLOGIA,2015,754(1):97-111.
APA	Feng, Song,Zhang, Fang,Sun, Song,Wang, Shiwei,&Li, Chaolun.(2015).Effects of duration at low temperature on asexual reproduction in polyps of the scyphozoan Nemopilema nomurai (Scyphozoa: Rhizostomeae).HYDROBIOLOGIA,754(1),97-111.
MLA	Feng, Song,et al."Effects of duration at low temperature on asexual reproduction in polyps of the scyphozoan Nemopilema nomurai (Scyphozoa: Rhizostomeae)".HYDROBIOLOGIA 754.1(2015):97-111.