Understanding the variability in the iron concentration of Antarctic krill
Antarctic krill may play a significant role in the Southern Ocean iron cycle. However, understanding the control on iron budgets by Antarctic krill is hampered by the large range in the reported iron concentration of krill. The aim of this study was to investigate the causes of the large range of ir...
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ftunivtasecite:oai:ecite.utas.edu.au:109374 2023-05-15T13:42:40+02:00 Understanding the variability in the iron concentration of Antarctic krill Ratnarajah, L Nicol, S Kawaguchi, S Townsend, AT Lannuzel, D Meiners, KM Bowie, AR 2016 https://doi.org/10.1002/lno.10322 http://ecite.utas.edu.au/109374 en eng Amer Soc Limnology Oceanography http://dx.doi.org/10.1002/lno.10322 Ratnarajah, L and Nicol, S and Kawaguchi, S and Townsend, AT and Lannuzel, D and Meiners, KM and Bowie, AR, Understanding the variability in the iron concentration of Antarctic krill, Limnology and Oceanography, 61, (5) pp. 1651-1660. ISSN 0024-3590 (2016) [Refereed Article] http://ecite.utas.edu.au/109374 Earth Sciences Oceanography Chemical oceanography Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1002/lno.10322 2022-08-30T09:11:43Z Antarctic krill may play a significant role in the Southern Ocean iron cycle. However, understanding the control on iron budgets by Antarctic krill is hampered by the large range in the reported iron concentration of krill. The aim of this study was to investigate the causes of the large range of iron concentrations in krill reported in the literature (6190 mg kg −1 ). Antarctic krill samples were collected from three research voyages to Pyrdz Bay, Antarctica, and analysed individually. Iron concentrations were measured using sector field inductively coupled plasma mass spectrometry in whole krill specimens and in the isolated stomach, digestive gland, muscle, body (whole krill excluding stomach and digestive gland), exoskeleton and faecal pellets. Iron concentrations in stomach (698 mg/kg), digestive gland (1482 mg kg −1 ), and faecal pellet (6831039 mg kg −1 ) were higher compared to muscle (47 mg kg −1 ), exoskeleton (615 mg kg −1 ), and body (418 mg kg −1 ) indicating that krill may ingest more iron than they require for physiological processes. Iron concentrations in whole krill from March 2012 (10 3 mg kg −1 ) were significantly lower compared to February 2003 (19 7 mg kg −1 ) and February 2015 (18 12 mg kg −1 ). Overall, the iron concentrations in krill from this study were consistently at the lower end of the published range. We propose that the large range in reported whole iron concentrations of krill can be accounted for by a combination of seasonal and regional differences in sampling, reflecting differences in the quantity and quality of their diet. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean Limnology and Oceanography 61 5 1651 1660 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical oceanography |
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Earth Sciences Oceanography Chemical oceanography Ratnarajah, L Nicol, S Kawaguchi, S Townsend, AT Lannuzel, D Meiners, KM Bowie, AR Understanding the variability in the iron concentration of Antarctic krill |
topic_facet |
Earth Sciences Oceanography Chemical oceanography |
description |
Antarctic krill may play a significant role in the Southern Ocean iron cycle. However, understanding the control on iron budgets by Antarctic krill is hampered by the large range in the reported iron concentration of krill. The aim of this study was to investigate the causes of the large range of iron concentrations in krill reported in the literature (6190 mg kg −1 ). Antarctic krill samples were collected from three research voyages to Pyrdz Bay, Antarctica, and analysed individually. Iron concentrations were measured using sector field inductively coupled plasma mass spectrometry in whole krill specimens and in the isolated stomach, digestive gland, muscle, body (whole krill excluding stomach and digestive gland), exoskeleton and faecal pellets. Iron concentrations in stomach (698 mg/kg), digestive gland (1482 mg kg −1 ), and faecal pellet (6831039 mg kg −1 ) were higher compared to muscle (47 mg kg −1 ), exoskeleton (615 mg kg −1 ), and body (418 mg kg −1 ) indicating that krill may ingest more iron than they require for physiological processes. Iron concentrations in whole krill from March 2012 (10 3 mg kg −1 ) were significantly lower compared to February 2003 (19 7 mg kg −1 ) and February 2015 (18 12 mg kg −1 ). Overall, the iron concentrations in krill from this study were consistently at the lower end of the published range. We propose that the large range in reported whole iron concentrations of krill can be accounted for by a combination of seasonal and regional differences in sampling, reflecting differences in the quantity and quality of their diet. |
format |
Article in Journal/Newspaper |
author |
Ratnarajah, L Nicol, S Kawaguchi, S Townsend, AT Lannuzel, D Meiners, KM Bowie, AR |
author_facet |
Ratnarajah, L Nicol, S Kawaguchi, S Townsend, AT Lannuzel, D Meiners, KM Bowie, AR |
author_sort |
Ratnarajah, L |
title |
Understanding the variability in the iron concentration of Antarctic krill |
title_short |
Understanding the variability in the iron concentration of Antarctic krill |
title_full |
Understanding the variability in the iron concentration of Antarctic krill |
title_fullStr |
Understanding the variability in the iron concentration of Antarctic krill |
title_full_unstemmed |
Understanding the variability in the iron concentration of Antarctic krill |
title_sort |
understanding the variability in the iron concentration of antarctic krill |
publisher |
Amer Soc Limnology Oceanography |
publishDate |
2016 |
url |
https://doi.org/10.1002/lno.10322 http://ecite.utas.edu.au/109374 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Southern Ocean |
op_relation |
http://dx.doi.org/10.1002/lno.10322 Ratnarajah, L and Nicol, S and Kawaguchi, S and Townsend, AT and Lannuzel, D and Meiners, KM and Bowie, AR, Understanding the variability in the iron concentration of Antarctic krill, Limnology and Oceanography, 61, (5) pp. 1651-1660. ISSN 0024-3590 (2016) [Refereed Article] http://ecite.utas.edu.au/109374 |
op_doi |
https://doi.org/10.1002/lno.10322 |
container_title |
Limnology and Oceanography |
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61 |
container_issue |
5 |
container_start_page |
1651 |
op_container_end_page |
1660 |
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1766171011320905728 |