Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night
This article was originally published in PLOS. The version of record is available at: https://doi.org/10.1371/journal.pbio.3001413 Light plays a fundamental role in the ecology of organisms in nearly all habitats on Earth and is central for processes such as vision and the entrainment of the circadi...
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ftunivdelaware:oai:udspace.udel.edu:19716/30224 2023-06-11T04:07:34+02:00 Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night Cohen, Jonathan H. Last, Kim S. Charpentier, Corie L. Cottier, Finlo Daase, Malin Hobbs, Laura Johnsen, Geir Berge, Jørgen 2021-10-19 application/pdf https://udspace.udel.edu/handle/19716/30224 en_US eng PLOS Biology Cohen JH, Last KS, Charpentier CL, Cottier F, Daase M, Hobbs L, et al. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biol 19(10): e3001413. https://doi.org/ 10.1371/journal.pbio.3001413 1545-7885 https://udspace.udel.edu/handle/19716/30224 Article 2021 ftunivdelaware 2023-05-01T12:58:31Z This article was originally published in PLOS. The version of record is available at: https://doi.org/10.1371/journal.pbio.3001413 Light plays a fundamental role in the ecology of organisms in nearly all habitats on Earth and is central for processes such as vision and the entrainment of the circadian clock. The poles represent extreme light regimes with an annual light cycle including periods of Midnight Sun and Polar Night. The Arctic Ocean extends to the North Pole, and marine light extremes reach their maximum extent in this habitat. During the Polar Night, traditional definitions of day and night and seasonal photoperiod become irrelevant since there are only “twilight” periods defined by the sun’s elevation below the horizon at midday; we term this “midday twilight.” Here, we characterize light across a latitudinal gradient (76.5° N to 81° N) during Polar Night in January. Our light measurements demonstrate that the classical solar diel light cycle dominant at lower latitudes is modulated during Arctic Polar Night by lunar and auroral components. We therefore question whether this particular ambient light environment is relevant to behavioral and visual processes. We reveal from acoustic field observations that the zooplankton community is undergoing diel vertical migration (DVM) behavior. Furthermore, using electroretinogram (ERG) recording under constant darkness, we show that the main migratory species, Arctic krill (Thysanoessa inermis) show endogenous increases in visual sensitivity during the subjective night. This change in sensitivity is comparable to that under exogenous dim light acclimations, although differences in speed of vision suggest separate mechanisms. We conclude that the extremely weak midday twilight experienced by krill at high latitudes during the darkest parts of the year has physiological and ecological relevance. Support for this work came from the Norwegian Research Council (NFR) projects ArcticABC and DeepImpact (NFR grants 244319 and 300333, JB) and the Centre for ... Article in Journal/Newspaper Arctic Arctic krill Arctic Arctic Ocean North Pole polar night Zooplankton midnight sun Thysanoessa inermis The University of Delaware Library Institutional Repository Arctic Arctic Ocean North Pole |
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Open Polar |
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The University of Delaware Library Institutional Repository |
op_collection_id |
ftunivdelaware |
language |
English |
description |
This article was originally published in PLOS. The version of record is available at: https://doi.org/10.1371/journal.pbio.3001413 Light plays a fundamental role in the ecology of organisms in nearly all habitats on Earth and is central for processes such as vision and the entrainment of the circadian clock. The poles represent extreme light regimes with an annual light cycle including periods of Midnight Sun and Polar Night. The Arctic Ocean extends to the North Pole, and marine light extremes reach their maximum extent in this habitat. During the Polar Night, traditional definitions of day and night and seasonal photoperiod become irrelevant since there are only “twilight” periods defined by the sun’s elevation below the horizon at midday; we term this “midday twilight.” Here, we characterize light across a latitudinal gradient (76.5° N to 81° N) during Polar Night in January. Our light measurements demonstrate that the classical solar diel light cycle dominant at lower latitudes is modulated during Arctic Polar Night by lunar and auroral components. We therefore question whether this particular ambient light environment is relevant to behavioral and visual processes. We reveal from acoustic field observations that the zooplankton community is undergoing diel vertical migration (DVM) behavior. Furthermore, using electroretinogram (ERG) recording under constant darkness, we show that the main migratory species, Arctic krill (Thysanoessa inermis) show endogenous increases in visual sensitivity during the subjective night. This change in sensitivity is comparable to that under exogenous dim light acclimations, although differences in speed of vision suggest separate mechanisms. We conclude that the extremely weak midday twilight experienced by krill at high latitudes during the darkest parts of the year has physiological and ecological relevance. Support for this work came from the Norwegian Research Council (NFR) projects ArcticABC and DeepImpact (NFR grants 244319 and 300333, JB) and the Centre for ... |
format |
Article in Journal/Newspaper |
author |
Cohen, Jonathan H. Last, Kim S. Charpentier, Corie L. Cottier, Finlo Daase, Malin Hobbs, Laura Johnsen, Geir Berge, Jørgen |
spellingShingle |
Cohen, Jonathan H. Last, Kim S. Charpentier, Corie L. Cottier, Finlo Daase, Malin Hobbs, Laura Johnsen, Geir Berge, Jørgen Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
author_facet |
Cohen, Jonathan H. Last, Kim S. Charpentier, Corie L. Cottier, Finlo Daase, Malin Hobbs, Laura Johnsen, Geir Berge, Jørgen |
author_sort |
Cohen, Jonathan H. |
title |
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
title_short |
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
title_full |
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
title_fullStr |
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
title_full_unstemmed |
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night |
title_sort |
photophysiological cycles in arctic krill are entrained by weak midday twilight during the polar night |
publisher |
PLOS Biology |
publishDate |
2021 |
url |
https://udspace.udel.edu/handle/19716/30224 |
geographic |
Arctic Arctic Ocean North Pole |
geographic_facet |
Arctic Arctic Ocean North Pole |
genre |
Arctic Arctic krill Arctic Arctic Ocean North Pole polar night Zooplankton midnight sun Thysanoessa inermis |
genre_facet |
Arctic Arctic krill Arctic Arctic Ocean North Pole polar night Zooplankton midnight sun Thysanoessa inermis |
op_relation |
Cohen JH, Last KS, Charpentier CL, Cottier F, Daase M, Hobbs L, et al. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biol 19(10): e3001413. https://doi.org/ 10.1371/journal.pbio.3001413 1545-7885 https://udspace.udel.edu/handle/19716/30224 |
_version_ |
1768380762669711360 |