Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis
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...
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Online Access: | http://ir.qdio.ac.cn/handle/337002/157394 http://ir.qdio.ac.cn/handle/337002/157395 https://doi.org/10.1007/s13131-017-1049-4 |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/157395 2023-05-15T14:03:36+02:00 Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis Zhang, Ye Li, Chaolun Yang, Guang Wang, Yanqing Tao, Zhencheng Zhang, Yongshan Wang, Aijun 2017-12-01 http://ir.qdio.ac.cn/handle/337002/157394 http://ir.qdio.ac.cn/handle/337002/157395 https://doi.org/10.1007/s13131-017-1049-4 英语 eng SPRINGER ACTA OCEANOLOGICA SINICA http://ir.qdio.ac.cn/handle/337002/157394 http://ir.qdio.ac.cn/handle/337002/157395 doi:10.1007/s13131-017-1049-4 Antarctic krill Prydz Bay diet shift stable isotope IsoSource Oceanography 期刊论文 2017 ftchinacasciocas https://doi.org/10.1007/s13131-017-1049-4 2022-06-27T05:39:27Z 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. Report Antarc* Antarctic Antarctic Krill Euphausia superba Prydz Bay Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Austral Prydz Bay Southern Ocean The Antarctic Acta Oceanologica Sinica 36 12 67 78 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Antarctic krill Prydz Bay diet shift stable isotope IsoSource Oceanography |
spellingShingle |
Antarctic krill Prydz Bay diet shift stable isotope IsoSource Oceanography Zhang, Ye Li, Chaolun Yang, Guang Wang, Yanqing Tao, Zhencheng Zhang, Yongshan Wang, Aijun Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
topic_facet |
Antarctic krill Prydz Bay diet shift stable isotope IsoSource Oceanography |
description |
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. |
format |
Report |
author |
Zhang, Ye Li, Chaolun Yang, Guang Wang, Yanqing Tao, Zhencheng Zhang, Yongshan Wang, Aijun |
author_facet |
Zhang, Ye Li, Chaolun Yang, Guang Wang, Yanqing Tao, Zhencheng Zhang, Yongshan Wang, Aijun |
author_sort |
Zhang, Ye |
title |
Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
title_short |
Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
title_full |
Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
title_fullStr |
Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
title_full_unstemmed |
Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
title_sort |
ontogenetic diet shift in antarctic krill (euphausia superba) in the prydz bay: a stable isotope analysis |
publisher |
SPRINGER |
publishDate |
2017 |
url |
http://ir.qdio.ac.cn/handle/337002/157394 http://ir.qdio.ac.cn/handle/337002/157395 https://doi.org/10.1007/s13131-017-1049-4 |
geographic |
Antarctic Austral Prydz Bay Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Prydz Bay Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Prydz Bay Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Prydz Bay Southern Ocean |
op_relation |
ACTA OCEANOLOGICA SINICA http://ir.qdio.ac.cn/handle/337002/157394 http://ir.qdio.ac.cn/handle/337002/157395 doi:10.1007/s13131-017-1049-4 |
op_doi |
https://doi.org/10.1007/s13131-017-1049-4 |
container_title |
Acta Oceanologica Sinica |
container_volume |
36 |
container_issue |
12 |
container_start_page |
67 |
op_container_end_page |
78 |
_version_ |
1766274312683126784 |