A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba
Antarctic krill, Euphausia superba, shapes the structure of the Southern Ocean ecosystem. Its central position in the food web, the ongoing environmental changes due to climatic warming, and increasing commercial interest on this species emphasize the urgency of understanding the adaptability of kri...
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Online Access: | https://epic.awi.de/id/eprint/25090/ https://epic.awi.de/id/eprint/25090/1/journal.pone.0026090.pdf https://doi.org/10.1371/journal.pone.0026090 https://hdl.handle.net/10013/epic.38328 https://hdl.handle.net/10013/epic.38328.d001 |
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ftawi:oai:epic.awi.de:25090 2023-05-15T13:46:51+02:00 A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba Teschke, Mathias Wendt, Sabrina Kawaguchi, So Kramer, Achim Meyer, Bettina 2011-10-07 application/pdf https://epic.awi.de/id/eprint/25090/ https://epic.awi.de/id/eprint/25090/1/journal.pone.0026090.pdf https://doi.org/10.1371/journal.pone.0026090 https://hdl.handle.net/10013/epic.38328 https://hdl.handle.net/10013/epic.38328.d001 unknown PUBLIC LIBRARY SCIENCE https://epic.awi.de/id/eprint/25090/1/journal.pone.0026090.pdf https://hdl.handle.net/10013/epic.38328.d001 Teschke, M. , Wendt, S. , Kawaguchi, S. , Kramer, A. and Meyer, B. orcid:0000-0001-6804-9896 (2011) A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba , PLoS ONE, 6 (10), pp. 1-9 . doi:10.1371/journal.pone.0026090 <https://doi.org/10.1371/journal.pone.0026090> , hdl:10013/epic.38328 EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 6(10), pp. 1-9, ISSN: 1932-6203 Article isiRev 2011 ftawi https://doi.org/10.1371/journal.pone.0026090 2021-12-24T15:35:19Z Antarctic krill, Euphausia superba, shapes the structure of the Southern Ocean ecosystem. Its central position in the food web, the ongoing environmental changes due to climatic warming, and increasing commercial interest on this species emphasize the urgency of understanding the adaptability of krill to its environment. Krill has evolved rhythmic physiological and behavioral functions which are synchronized with the daily and seasonal cycles of the complex Southern Ocean ecosystem. The mechanisms, however, leading to these rhythms are essentially unknown. Here, we show that krill possesses an endogenous circadian clock that governs metabolic and physiological output rhythms. We found that expression of the canonical clock gene cry2 was highly rhythmic both in a light-dark cycle and in constant darkness. We detected a remarkable short circadian period, which we interpret as a special feature of the krill's circadian clock that helps to entrain the circadian system to the extreme range of photoperiods krill is exposed to throughout the year. Furthermore, we found that important key metabolic enzymes of krill showed bimodal circadian oscillations (~9–12 h period) in transcript abundance and enzymatic activity. Oxygen consumption of krill showed ~9–12 h oscillations that correlated with the temporal activity profile of key enzymes of aerobic energy metabolism. Our results demonstrate the first report of an endogenous circadian timing system in Antarctic krill and its likely link to metabolic key processes. Krill's circadian clock may not only be critical for synchronization to the solar day but also for the control of seasonal events. This study provides a powerful basis for the investigation into the mechanisms of temporal synchronization in this marine key species and will also lead to the first comprehensive analyses of the circadian clock of a polar marine organism through the entire photoperiodic cycle. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean PLoS ONE 6 10 e26090 |
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Open Polar |
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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, shapes the structure of the Southern Ocean ecosystem. Its central position in the food web, the ongoing environmental changes due to climatic warming, and increasing commercial interest on this species emphasize the urgency of understanding the adaptability of krill to its environment. Krill has evolved rhythmic physiological and behavioral functions which are synchronized with the daily and seasonal cycles of the complex Southern Ocean ecosystem. The mechanisms, however, leading to these rhythms are essentially unknown. Here, we show that krill possesses an endogenous circadian clock that governs metabolic and physiological output rhythms. We found that expression of the canonical clock gene cry2 was highly rhythmic both in a light-dark cycle and in constant darkness. We detected a remarkable short circadian period, which we interpret as a special feature of the krill's circadian clock that helps to entrain the circadian system to the extreme range of photoperiods krill is exposed to throughout the year. Furthermore, we found that important key metabolic enzymes of krill showed bimodal circadian oscillations (~9–12 h period) in transcript abundance and enzymatic activity. Oxygen consumption of krill showed ~9–12 h oscillations that correlated with the temporal activity profile of key enzymes of aerobic energy metabolism. Our results demonstrate the first report of an endogenous circadian timing system in Antarctic krill and its likely link to metabolic key processes. Krill's circadian clock may not only be critical for synchronization to the solar day but also for the control of seasonal events. This study provides a powerful basis for the investigation into the mechanisms of temporal synchronization in this marine key species and will also lead to the first comprehensive analyses of the circadian clock of a polar marine organism through the entire photoperiodic cycle. |
format |
Article in Journal/Newspaper |
author |
Teschke, Mathias Wendt, Sabrina Kawaguchi, So Kramer, Achim Meyer, Bettina |
spellingShingle |
Teschke, Mathias Wendt, Sabrina Kawaguchi, So Kramer, Achim Meyer, Bettina A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
author_facet |
Teschke, Mathias Wendt, Sabrina Kawaguchi, So Kramer, Achim Meyer, Bettina |
author_sort |
Teschke, Mathias |
title |
A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
title_short |
A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
title_full |
A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
title_fullStr |
A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
title_full_unstemmed |
A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba |
title_sort |
circadian clock in antarctic krill: an endogenous timing system governs metabolic output rhythms in the euphausid species euphausia superba |
publisher |
PUBLIC LIBRARY SCIENCE |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/25090/ https://epic.awi.de/id/eprint/25090/1/journal.pone.0026090.pdf https://doi.org/10.1371/journal.pone.0026090 https://hdl.handle.net/10013/epic.38328 https://hdl.handle.net/10013/epic.38328.d001 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
op_source |
EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 6(10), pp. 1-9, ISSN: 1932-6203 |
op_relation |
https://epic.awi.de/id/eprint/25090/1/journal.pone.0026090.pdf https://hdl.handle.net/10013/epic.38328.d001 Teschke, M. , Wendt, S. , Kawaguchi, S. , Kramer, A. and Meyer, B. orcid:0000-0001-6804-9896 (2011) A circadian clock in Antarctic krill: An endogenous timing system governs metabolic output rhythms in the Euphausid species Euphausia superba , PLoS ONE, 6 (10), pp. 1-9 . doi:10.1371/journal.pone.0026090 <https://doi.org/10.1371/journal.pone.0026090> , hdl:10013/epic.38328 |
op_doi |
https://doi.org/10.1371/journal.pone.0026090 |
container_title |
PLoS ONE |
container_volume |
6 |
container_issue |
10 |
container_start_page |
e26090 |
_version_ |
1766245336840404992 |