Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer

IOCAS-IR

	Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer
	Mengtan Liu ; Zhencheng Tao ; Ye Zhang; Guang Yang ; Song Sun; Chaolun Li; Fengfeng Le
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2019-10-15
出版年	2019
卷号	v.38 期号:10 页码:79-87
文献类型	CNKI期刊论文
摘要	Euphausia superba is a key species in the Southern Ocean that serves as a link between primary production and higher trophic levels. To investigate the feeding strategies of E. superba from the eastern South Shetland Islands,fatty acid biomarkers, stable isotope signatures, and an incubation experiment were conducted. The results of the incubation experiment proved that adult E. superba mainly fed on 2–20 μm particles, demonstrating the importance of nanoplankton in their diet. Moreover, significant positive relationships between δ15 N and body size demonstrated that size-related dietary shifts were present in E. superba. Evidence from principal component analysis and the C16:1ω7/C18:4ω3 ratio showed that juveniles preferentially fed on dinoflagellates and adults were more likely to feed on diatoms. Fatty acid profiles in adult E. superba roughly mirrored the different trophic conditions and feeding strategies between stations. Adult E. superba at Stas D2-07, D5-07, DA-01 and DA-02 exhibited elevated levels of C16:1ω7, C18:4ω3, C18:1ω9 and C18:1ω9/C18:1ω7, indicating higher levels of feeding on both phytoplankton and higher trophic diets. In contrast, adult E. superba at Stas D1-03 and D1-04 were characterized by high levels of polyunsaturated fatty acids/saturated fatty acids ratios and low levels of C16:1ω7,C18:1ω7, C18:4ω3, C18:1ω9 and total fatty acids. We inferred that adult krill at Stas D1-03 and D1-04 still suffered from difficult dietary conditions after overwintering. The different dietary conditions between stations suggest a highly plastic feeding strategy of E. superba in the eastern South Shetland Islands.
关键词	Euphausia superba South Shetland Islands fatty acids stable isotopes
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A006;
CNKI专题名称	生物学;
分类号	Q958
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	The National Natural Science Foundation of China under contract No.41406159 ; the Science&Technology Basic Resources Investigation Program of China under contract No.2017FY100803 ; the Chinese Polar Environment Comprehensive Investigation&Assessment Programmes under contract No.CHINARE2016-01-05 ; the Scientific and Technological Innovation Project by Qingdao National Laboratory for Marine Science and Technology under contract No.2015ASKJ02
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188432
专题	中国科学院海洋研究所
作者单位	1.JiaozhouBayNationalMarineEcosystemResearchStation,InstituteofOceanology,ChineseAcademyofSciences 2.LaboratoryforMarineEcologyandEnvironmentalScience,PilotNationalLaboratoryforMarineScienceandTechnology(Qingdao) 3.CenterforOceanMega-Science,ChineseAcademyofSciences 4.KeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences 5.EastSeaMarineEnvironmentalInvestigatingandSurveyingCenter,MinistryofNaturalResources 6.LaboratoryofMarineEcosystemandBiogeochemistry,SecondInstituteofOceanography,MinistryofNaturalResources
推荐引用方式 GB/T 7714	Mengtan Liu,Zhencheng Tao,Ye Zhang,et al. Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer. 2019.