Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic
The circadian clock provides a mechanism for anticipating environmental cycles and is synchronized by temporal cues such as daily light/dark cycle or photoperiod. However, the Arctic environment is characterized by several months of Midnight Sun when the sun is continuously above the horizon and whe...
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Online Access: | http://dx.doi.org/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2020.0257 |
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crroyalsociety:10.1098/rsbl.2020.0257 2024-06-02T08:01:41+00:00 Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic Hüppe, Lukas Payton, Laura Last, Kim Wilcockson, David Ershova, Elizaveta Meyer, Bettina Natural Environment Research Council Bundesministerium für Bildung und Forschung Universitetet i Tromsø Tromsø Research Foundation Open Access Publication Funds Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research IO RAS 2020 http://dx.doi.org/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2020.0257 en eng The Royal Society http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Biology Letters volume 16, issue 7, page 20200257 ISSN 1744-9561 1744-957X journal-article 2020 crroyalsociety https://doi.org/10.1098/rsbl.2020.0257 2024-05-07T14:15:58Z The circadian clock provides a mechanism for anticipating environmental cycles and is synchronized by temporal cues such as daily light/dark cycle or photoperiod. However, the Arctic environment is characterized by several months of Midnight Sun when the sun is continuously above the horizon and where sea ice further attenuates photoperiod. To test if the oscillations of circadian clock genes remain in synchrony with subtle environmental changes, we sampled the copepod Calanus finmarchicus, a key zooplankter in the north Atlantic, to determine in situ daily circadian clock gene expression near the summer solstice at a southern (74.5° N) sea ice-free and a northern (82.5° N) sea ice-covered station. Results revealed significant oscillation of genes at both stations, indicating the persistence of the clock at this time. While copepods from the southern station showed oscillations in the daily range, those from the northern station exhibited an increase in ultradian oscillations. We suggest that in C. finmarchicus , even small daily changes of solar altitude seem to be sufficient to entrain the circadian clock and propose that at very high latitudes, in under-ice ecosystems, tidal cues may be used as an additional entrainment cue. Article in Journal/Newspaper Arctic Calanus finmarchicus North Atlantic Sea ice Copepods midnight sun The Royal Society Arctic Biology Letters 16 7 20200257 |
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Open Polar |
collection |
The Royal Society |
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crroyalsociety |
language |
English |
description |
The circadian clock provides a mechanism for anticipating environmental cycles and is synchronized by temporal cues such as daily light/dark cycle or photoperiod. However, the Arctic environment is characterized by several months of Midnight Sun when the sun is continuously above the horizon and where sea ice further attenuates photoperiod. To test if the oscillations of circadian clock genes remain in synchrony with subtle environmental changes, we sampled the copepod Calanus finmarchicus, a key zooplankter in the north Atlantic, to determine in situ daily circadian clock gene expression near the summer solstice at a southern (74.5° N) sea ice-free and a northern (82.5° N) sea ice-covered station. Results revealed significant oscillation of genes at both stations, indicating the persistence of the clock at this time. While copepods from the southern station showed oscillations in the daily range, those from the northern station exhibited an increase in ultradian oscillations. We suggest that in C. finmarchicus , even small daily changes of solar altitude seem to be sufficient to entrain the circadian clock and propose that at very high latitudes, in under-ice ecosystems, tidal cues may be used as an additional entrainment cue. |
author2 |
Natural Environment Research Council Bundesministerium für Bildung und Forschung Universitetet i Tromsø Tromsø Research Foundation Open Access Publication Funds Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research IO RAS |
format |
Article in Journal/Newspaper |
author |
Hüppe, Lukas Payton, Laura Last, Kim Wilcockson, David Ershova, Elizaveta Meyer, Bettina |
spellingShingle |
Hüppe, Lukas Payton, Laura Last, Kim Wilcockson, David Ershova, Elizaveta Meyer, Bettina Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
author_facet |
Hüppe, Lukas Payton, Laura Last, Kim Wilcockson, David Ershova, Elizaveta Meyer, Bettina |
author_sort |
Hüppe, Lukas |
title |
Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
title_short |
Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
title_full |
Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
title_fullStr |
Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
title_full_unstemmed |
Evidence for oscillating circadian clock genes in the copepod Calanus finmarchicusduring the summer solstice in the high Arctic |
title_sort |
evidence for oscillating circadian clock genes in the copepod calanus finmarchicusduring the summer solstice in the high arctic |
publisher |
The Royal Society |
publishDate |
2020 |
url |
http://dx.doi.org/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2020.0257 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2020.0257 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Calanus finmarchicus North Atlantic Sea ice Copepods midnight sun |
genre_facet |
Arctic Calanus finmarchicus North Atlantic Sea ice Copepods midnight sun |
op_source |
Biology Letters volume 16, issue 7, page 20200257 ISSN 1744-9561 1744-957X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1098/rsbl.2020.0257 |
container_title |
Biology Letters |
container_volume |
16 |
container_issue |
7 |
container_start_page |
20200257 |
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1800746081366048768 |