Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis

doi:10.1007/s13131-017-1049-4

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	Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis
	Zhang, Ye1,2,3 ; Li, Chaolun1,2,3 ; Yang, Guang 1,3; Wang, Yanqing 1,3; Tao, Zhencheng 1,3; Zhang, Yongshan 1,3; Wang, Aijun 4
刊名	ACTA OCEANOLOGICA SINICA
	2017-12-01
卷号	36 期号:12 页码:67-78
关键词	Antarctic krill Prydz Bay diet shift stable isotope IsoSource
ISSN号	0253-505X
DOI	10.1007/s13131-017-1049-4
通讯作者	Li, Chaolun(lcl@qdio.ac.cn)
英文摘要	As one of the most common and dominant species in the Southern Ocean, Antarctic krill (Euphausia superba) play a significant role in food web structure and the process of energy flow. The diet of Antarctic krill in the Prydz Bay during austral summer of 2012/2013 was investigated and the ontogenetic shift in krill diet was evaluated using the stable isotope method. The nitrogen stable isotope values (delta N-15) of adults ((2.78 +/- 0.58)aEuro degrees) were much higher than those of juveniles ((1.69 +/- 0.70)aEuro degrees), whereas the carbon stable isotope values (delta C-13) of adults (-(28.26 +/- 1.08)aEuro degrees) were slightly lower than those of juveniles (-(27.48 +/- 1.35)aEuro degrees). Particulate organic matter (POM) from 0, 25, and 50 m depth combined (0/25/50 m) represented phytoplankton food items. The results showed that phytoplankton food items in surface water and mesozooplankton were two essential food items for Antarctic krill in the Prydz Bay during summer. POM (0/25/50 m) contributes 56%-69% and 26%-34% to the diet of juvenile and adult krill, respectively, whereas mesozooplankton composes 13%-34% and 58%-71% of the diet of juvenile and adult krill, respectively. Thus, an ontogenetic diet shift from POM (0/25/50 m), which consists mainly of phytoplankton, to a higher trophic level diet containing mesozooplankton, was detected. The capacity for adults to consume more zooplankton food items may minimize their food competition with juveniles, which rely mostly on phytoplankton food items. This suggests "diet shift with ontogeny" which may somehow help krill keep their dietary energy budget balanced and well adapted to the Antarctic marine ecosystem as a dominant species.
资助项目	Chinese Polar Environment Comprehensive Investigation & Assessment Programmes[CHINARE2016-01-05] ; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2015ASKJ01] ; National Natural Science Foundation of China[41206180]
WOS研究方向	Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000417883300009
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/157394]
专题	海洋研究所_海洋生态与环境科学重点实验室
通讯作者	Li, Chaolun
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 4.State Ocean Adm, Inst Oceanog 3, Xiamen 361005, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Ye,Li, Chaolun,Yang, Guang,et al. Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis[J]. ACTA OCEANOLOGICA SINICA,2017,36(12):67-78.
APA	Zhang, Ye.,Li, Chaolun.,Yang, Guang.,Wang, Yanqing.,Tao, Zhencheng.,...&Wang, Aijun.(2017).Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis.ACTA OCEANOLOGICA SINICA,36(12),67-78.
MLA	Zhang, Ye,et al."Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis".ACTA OCEANOLOGICA SINICA 36.12(2017):67-78.