Home > Online First > Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer

Citation: Mengtan Liu, Zhencheng Tao, Ye Zhang, Guang Yang, Song Sun, Chaolun Li, Fengfeng Le. Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer. ACTA OCEANOLOGICA SINICA, doi: 10.1007/s13131-019-1392-8

doi: 10.1007/s13131-019-1392-8

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

1.  Jiaozhou Bay National Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.  Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao) , Qingdao 266237, China
3.  Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
4.  Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
5.  East Sea Marine Environmental Investigating and Surveying Center, Ministry of Natural Resources , Shanghai 200137, China
6.  Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Corresponding author: Zhencheng Tao, taozc@qdio.ac.cnCorresponding author: Chaolun Li, lcl@qdio.ac.cn

Received Date: 2018-08-06
Web Publishing Date: 2019-10-01

Fund Project: 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.

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 to 20 μm particles, demonstrating the importance of nanoplankton in their diet. Moreover, significant positive relationships between δ15N 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 that 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.

Key words: Euphausia superba , South Shetland Islands , fatty acids , stable isotopes

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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