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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Online Access: | https://research.wur.nl/en/publications/spatio-temporal-variability-in-the-winter-diet-of-larval-and-juve https://doi.org/10.3354/meps12309 |
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ftunivwagenin:oai:library.wur.nl:wurpubs/527571 2024-02-04T09:55:44+01:00 Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters Schaafsma, F.L. Kohlbach, D. David, C. Lange, B.A. Graeve, M. Flores, H. van Franeker, J.A. 2017 application/pdf https://research.wur.nl/en/publications/spatio-temporal-variability-in-the-winter-diet-of-larval-and-juve https://doi.org/10.3354/meps12309 en eng https://edepot.wur.nl/424451 https://research.wur.nl/en/publications/spatio-temporal-variability-in-the-winter-diet-of-larval-and-juve doi:10.3354/meps12309 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research Marine Ecology Progress Series 580 (2017) ISSN: 0171-8630 Furcilia Juveniles Weddell Sea euphausia-superba fatty acids sea ice stomach contents winter info:eu-repo/semantics/article Article/Letter to editor info:eu-repo/semantics/publishedVersion 2017 ftunivwagenin https://doi.org/10.3354/meps12309 2024-01-10T23:17:47Z 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 theNorthern 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 developingAC0 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 Wageningen UR (University & Research Centre): Digital Library Antarctic Southern Ocean Weddell Sea Weddell Marine Ecology Progress Series 580 101 115 |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
Furcilia Juveniles Weddell Sea euphausia-superba fatty acids sea ice stomach contents winter |
spellingShingle |
Furcilia Juveniles Weddell Sea euphausia-superba fatty acids sea ice stomach contents winter Schaafsma, F.L. Kohlbach, D. David, C. Lange, B.A. Graeve, M. Flores, H. van Franeker, J.A. Spatio-temporal variability in the winter diet of larval and juvenile Antarctic krill, Euphausia superba, in ice-covered waters |
topic_facet |
Furcilia Juveniles Weddell Sea euphausia-superba fatty acids sea ice stomach contents winter |
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 theNorthern 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 developingAC0 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, F.L. Kohlbach, D. David, C. Lange, B.A. Graeve, M. Flores, H. van Franeker, J.A. |
author_facet |
Schaafsma, F.L. Kohlbach, D. David, C. Lange, B.A. Graeve, M. Flores, H. van Franeker, J.A. |
author_sort |
Schaafsma, F.L. |
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://research.wur.nl/en/publications/spatio-temporal-variability-in-the-winter-diet-of-larval-and-juve https://doi.org/10.3354/meps12309 |
geographic |
Antarctic Southern Ocean Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Weddell |
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 |
Marine Ecology Progress Series 580 (2017) ISSN: 0171-8630 |
op_relation |
https://edepot.wur.nl/424451 https://research.wur.nl/en/publications/spatio-temporal-variability-in-the-winter-diet-of-larval-and-juve doi:10.3354/meps12309 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research |
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_ |
1789959842918563840 |