Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer
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 experi...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/163393 2023-05-15T16:08:27+02:00 Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer Liu, Mengtan Tao, Zhencheng Zhang, Ye Yang, Guang Sun, Song Li, Chaolun Le, Fengfeng 2019-10-01 http://ir.qdio.ac.cn/handle/337002/163392 http://ir.qdio.ac.cn/handle/337002/163393 https://doi.org/10.1007/s13131-019-1392-8 英语 eng SPRINGER ACTA OCEANOLOGICA SINICA http://ir.qdio.ac.cn/handle/337002/163392 http://ir.qdio.ac.cn/handle/337002/163393 doi:10.1007/s13131-019-1392-8 Euphausia superba South Shetland Islands fatty acids stable isotopes Oceanography 期刊论文 2019 ftchinacasciocas https://doi.org/10.1007/s13131-019-1392-8 2022-06-27T05:41:21Z 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 mu m particles, demonstrating the importance of nanoplankton in their diet. Moreover, significant positive relationships between delta N-15 and body size demonstrated that size-related dietary shifts were present in E. superba. Evidence from principal component analysis and the C16:1 omega 7/C18:4 omega 3 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 C16:1 omega 7, C18:4 omega 3, C18:1 omega 9 and C18:1 omega 9/C18:1 omega 7, 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 C16:1 omega 7, C18:1 omega 7, C18:4 omega 3, C18:1 omega 9 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. Report Euphausia superba South Shetland Islands Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Austral South Shetland Islands Southern Ocean Acta Oceanologica Sinica 38 10 75 83 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Euphausia superba South Shetland Islands fatty acids stable isotopes Oceanography |
spellingShingle |
Euphausia superba South Shetland Islands fatty acids stable isotopes Oceanography Liu, Mengtan Tao, Zhencheng Zhang, Ye Yang, Guang Sun, Song Li, Chaolun Le, Fengfeng Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
topic_facet |
Euphausia superba South Shetland Islands fatty acids stable isotopes Oceanography |
description |
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 mu m particles, demonstrating the importance of nanoplankton in their diet. Moreover, significant positive relationships between delta N-15 and body size demonstrated that size-related dietary shifts were present in E. superba. Evidence from principal component analysis and the C16:1 omega 7/C18:4 omega 3 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 C16:1 omega 7, C18:4 omega 3, C18:1 omega 9 and C18:1 omega 9/C18:1 omega 7, 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 C16:1 omega 7, C18:1 omega 7, C18:4 omega 3, C18:1 omega 9 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. |
format |
Report |
author |
Liu, Mengtan Tao, Zhencheng Zhang, Ye Yang, Guang Sun, Song Li, Chaolun Le, Fengfeng |
author_facet |
Liu, Mengtan Tao, Zhencheng Zhang, Ye Yang, Guang Sun, Song Li, Chaolun Le, Fengfeng |
author_sort |
Liu, Mengtan |
title |
Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
title_short |
Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
title_full |
Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
title_fullStr |
Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
title_full_unstemmed |
Feeding strategies of Euphausia superba in the eastern South Shetland Islands in austral summer |
title_sort |
feeding strategies of euphausia superba in the eastern south shetland islands in austral summer |
publisher |
SPRINGER |
publishDate |
2019 |
url |
http://ir.qdio.ac.cn/handle/337002/163392 http://ir.qdio.ac.cn/handle/337002/163393 https://doi.org/10.1007/s13131-019-1392-8 |
geographic |
Austral South Shetland Islands Southern Ocean |
geographic_facet |
Austral South Shetland Islands Southern Ocean |
genre |
Euphausia superba South Shetland Islands Southern Ocean |
genre_facet |
Euphausia superba South Shetland Islands Southern Ocean |
op_relation |
ACTA OCEANOLOGICA SINICA http://ir.qdio.ac.cn/handle/337002/163392 http://ir.qdio.ac.cn/handle/337002/163393 doi:10.1007/s13131-019-1392-8 |
op_doi |
https://doi.org/10.1007/s13131-019-1392-8 |
container_title |
Acta Oceanologica Sinica |
container_volume |
38 |
container_issue |
10 |
container_start_page |
75 |
op_container_end_page |
83 |
_version_ |
1766404506759725056 |