Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters
Antarctic krill Euphausia superba is an ecological key species in the Southern Ocean and a major fisheries resource. The winter survival of age class 0 (AC0) krill is susceptible to changes in the sea-ice environment due to their association with sea ice and their need to feed during their first win...
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ftawi:oai:epic.awi.de:52363 2023-05-15T13:45:22+02:00 Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters Schaafsma, FL Kohlbach, D David, C Lange, BA Graeve, M Flores, H van Franeker, JA 2017 https://epic.awi.de/id/eprint/52363/ https://doi.org/10.3354/meps12309 https://hdl.handle.net/10013/epic.db229e6d-288a-4d1f-96a9-97138d9021b1 unknown Schaafsma, F. , Kohlbach, D. , David, C. , Lange, B. , Graeve, M. , Flores, H. and van Franeker, J. (2017) Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters , Marine Ecology Progress Series, 580 , pp. 101-115 . doi:10.3354/meps12309 <https://doi.org/10.3354/meps12309> , hdl:10013/epic.db229e6d-288a-4d1f-96a9-97138d9021b1 EPIC3Marine Ecology Progress Series, 580, pp. 101-115, ISSN: 0171-8630 Article peerRev 2017 ftawi https://doi.org/10.3354/meps12309 2021-12-24T15:45:41Z Antarctic krill Euphausia superba is an ecological key species in the Southern Ocean and a major fisheries resource. The winter survival of age class 0 (AC0) krill is susceptible to changes in the sea-ice environment due to their association with sea ice and their need to feed during their first winter. However, our understanding of their overwintering diet and its variability is limited. We studied the spatio-temporal variability of the diet in 4 cohorts of AC0 krill in the Northern Weddell Sea during late winter 2013 using stomach contents, fatty acids (FAs) and bulk stable isotope analysis (BSIA). Stomach contents were dominated by diatoms in numbers and occasionally contained large volumes of copepods. Many of the prey species found in the stomachs were sea ice-associated. Our results show that the diet of overwintering AC0 krill varies significantly in space and time. Variability in stomach content composition was related to environmental factors, including chlorophyll a concentration, copepod abundance and sea-ice cover. In contrast, FA composition mainly varied between cohorts, indicating variation in the long-term diet. The condition of the AC0 krill was reflected in FA and BSIA analysis, suggesting that the availability of sea ice-derived food sources over a long period may impact the condition of developing AC0 krill significantly. The spatio-temporal availability of sea-ice resources is a potentially important factor for AC0 krill winter survival. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean Weddell Sea Copepods ice covered waters Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean Weddell Weddell Sea Marine Ecology Progress Series 580 101 115 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Antarctic krill Euphausia superba is an ecological key species in the Southern Ocean and a major fisheries resource. The winter survival of age class 0 (AC0) krill is susceptible to changes in the sea-ice environment due to their association with sea ice and their need to feed during their first winter. However, our understanding of their overwintering diet and its variability is limited. We studied the spatio-temporal variability of the diet in 4 cohorts of AC0 krill in the Northern Weddell Sea during late winter 2013 using stomach contents, fatty acids (FAs) and bulk stable isotope analysis (BSIA). Stomach contents were dominated by diatoms in numbers and occasionally contained large volumes of copepods. Many of the prey species found in the stomachs were sea ice-associated. Our results show that the diet of overwintering AC0 krill varies significantly in space and time. Variability in stomach content composition was related to environmental factors, including chlorophyll a concentration, copepod abundance and sea-ice cover. In contrast, FA composition mainly varied between cohorts, indicating variation in the long-term diet. The condition of the AC0 krill was reflected in FA and BSIA analysis, suggesting that the availability of sea ice-derived food sources over a long period may impact the condition of developing AC0 krill significantly. The spatio-temporal availability of sea-ice resources is a potentially important factor for AC0 krill winter survival. |
format |
Article in Journal/Newspaper |
author |
Schaafsma, FL Kohlbach, D David, C Lange, BA Graeve, M Flores, H van Franeker, JA |
spellingShingle |
Schaafsma, FL Kohlbach, D David, C Lange, BA Graeve, M Flores, H van Franeker, JA Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
author_facet |
Schaafsma, FL Kohlbach, D David, C Lange, BA Graeve, M Flores, H van Franeker, JA |
author_sort |
Schaafsma, FL |
title |
Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
title_short |
Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
title_full |
Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
title_fullStr |
Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
title_full_unstemmed |
Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
title_sort |
spatio-temporal variability in the winter diet of larval and juvenile antarctic krill, euphausia superba, in ice-covered waters |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/52363/ https://doi.org/10.3354/meps12309 https://hdl.handle.net/10013/epic.db229e6d-288a-4d1f-96a9-97138d9021b1 |
geographic |
Antarctic Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean Weddell Sea Copepods ice covered waters |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean Weddell Sea Copepods ice covered waters |
op_source |
EPIC3Marine Ecology Progress Series, 580, pp. 101-115, ISSN: 0171-8630 |
op_relation |
Schaafsma, F. , Kohlbach, D. , David, C. , Lange, B. , Graeve, M. , Flores, H. and van Franeker, J. (2017) Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters , Marine Ecology Progress Series, 580 , pp. 101-115 . doi:10.3354/meps12309 <https://doi.org/10.3354/meps12309> , hdl:10013/epic.db229e6d-288a-4d1f-96a9-97138d9021b1 |
op_doi |
https://doi.org/10.3354/meps12309 |
container_title |
Marine Ecology Progress Series |
container_volume |
580 |
container_start_page |
101 |
op_container_end_page |
115 |
_version_ |
1766222109497884672 |