Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird
International audience Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic may spend as much as two-thirds of the...
Published in: | Journal of Experimental Biology |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03115200 https://doi.org/10.1242/jeb.220699 |
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ftccsdartic:oai:HAL:hal-03115200v1 2023-05-15T14:51:55+02:00 Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird Appenroth, Daniel Melum, Vebjørn, West, Alexander, Dardente, Hugues Hazlerigg, David, Wagner, Gabriela University of Tromsø (UiT) Physiologie de la reproduction et des comportements Nouzilly (PRC) Institut Français du Cheval et de l'Equitation Saumur -Université de Tours-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2020-08-21 https://hal.archives-ouvertes.fr/hal-03115200 https://doi.org/10.1242/jeb.220699 en eng HAL CCSD The Company of Biologists info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.220699 hal-03115200 https://hal.archives-ouvertes.fr/hal-03115200 doi:10.1242/jeb.220699 WOS: 000576694400003 ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.archives-ouvertes.fr/hal-03115200 Journal of Experimental Biology, The Company of Biologists, 2020, 223 (16), pp.1-8. ⟨10.1242/jeb.220699⟩ Photoperiodism Circadian Seasonal reproduction Pars tuberalis Eyes absent Delodinase Svalbard ptarmigan [SDV.BDLR]Life Sciences [q-bio]/Reproductive Biology info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1242/jeb.220699 2021-11-27T23:55:57Z International audience Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic may spend as much as two-thirds of the year without experiencing dawn or dusk. This suggests that specialised mechanisms may be required to maintain seasonal synchrony in polar regions. Svalbard ptarmigan (Lagopus muta hyperborea) are resident at 74-81 degrees N latitude. They spend winter in constant darkness (DD) and summer in constant light (LL); extreme photoperiodic conditions under which they do not display overt circadian rhythms. Here, we explored how Arctic adaptation in circadian biology affects photoperiodic time measurement in captive Svalbard ptarmigan. For this purpose. DD-adapted birds, showing no circadian behaviour, either remained in prolonged DD, were transferred into a simulated natural photoperiod (SNP) or were transferred directly into LL. Birds transferred from DD to LL exhibited a strong photoperiodic response in terms of activation of the hypothalamic thyrotropin-mediated photoperiodic response pathway. This was assayed through expression of the Eya3, Tsh beta and deiodinase genes, as well as gonadal development. While transfer to SNP established synchronous diurnal activity patterns, activity in birds transferred from DD to LL showed no evidence of circadian rhythmicity. These data show that the Svalbard ptarmigan does not require circadian entrainment to develop a photoperiodic response involving conserved molecular elements found in temperate species. Further studies are required to define how exactly Arctic adaptation modifies seasonal timer mechanisms. Article in Journal/Newspaper Arctic Lagopus muta Lagopus muta hyperborea Svalbard Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Svalbard Journal of Experimental Biology |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Photoperiodism Circadian Seasonal reproduction Pars tuberalis Eyes absent Delodinase Svalbard ptarmigan [SDV.BDLR]Life Sciences [q-bio]/Reproductive Biology |
spellingShingle |
Photoperiodism Circadian Seasonal reproduction Pars tuberalis Eyes absent Delodinase Svalbard ptarmigan [SDV.BDLR]Life Sciences [q-bio]/Reproductive Biology Appenroth, Daniel Melum, Vebjørn, West, Alexander, Dardente, Hugues Hazlerigg, David, Wagner, Gabriela Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
topic_facet |
Photoperiodism Circadian Seasonal reproduction Pars tuberalis Eyes absent Delodinase Svalbard ptarmigan [SDV.BDLR]Life Sciences [q-bio]/Reproductive Biology |
description |
International audience Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic may spend as much as two-thirds of the year without experiencing dawn or dusk. This suggests that specialised mechanisms may be required to maintain seasonal synchrony in polar regions. Svalbard ptarmigan (Lagopus muta hyperborea) are resident at 74-81 degrees N latitude. They spend winter in constant darkness (DD) and summer in constant light (LL); extreme photoperiodic conditions under which they do not display overt circadian rhythms. Here, we explored how Arctic adaptation in circadian biology affects photoperiodic time measurement in captive Svalbard ptarmigan. For this purpose. DD-adapted birds, showing no circadian behaviour, either remained in prolonged DD, were transferred into a simulated natural photoperiod (SNP) or were transferred directly into LL. Birds transferred from DD to LL exhibited a strong photoperiodic response in terms of activation of the hypothalamic thyrotropin-mediated photoperiodic response pathway. This was assayed through expression of the Eya3, Tsh beta and deiodinase genes, as well as gonadal development. While transfer to SNP established synchronous diurnal activity patterns, activity in birds transferred from DD to LL showed no evidence of circadian rhythmicity. These data show that the Svalbard ptarmigan does not require circadian entrainment to develop a photoperiodic response involving conserved molecular elements found in temperate species. Further studies are required to define how exactly Arctic adaptation modifies seasonal timer mechanisms. |
author2 |
University of Tromsø (UiT) Physiologie de la reproduction et des comportements Nouzilly (PRC) Institut Français du Cheval et de l'Equitation Saumur -Université de Tours-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Appenroth, Daniel Melum, Vebjørn, West, Alexander, Dardente, Hugues Hazlerigg, David, Wagner, Gabriela |
author_facet |
Appenroth, Daniel Melum, Vebjørn, West, Alexander, Dardente, Hugues Hazlerigg, David, Wagner, Gabriela |
author_sort |
Appenroth, Daniel |
title |
Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
title_short |
Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
title_full |
Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
title_fullStr |
Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
title_full_unstemmed |
Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird |
title_sort |
photoperiodic induction without light-mediated circadian entrainment in a high arctic resident bird |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03115200 https://doi.org/10.1242/jeb.220699 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Lagopus muta Lagopus muta hyperborea Svalbard |
genre_facet |
Arctic Lagopus muta Lagopus muta hyperborea Svalbard |
op_source |
ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.archives-ouvertes.fr/hal-03115200 Journal of Experimental Biology, The Company of Biologists, 2020, 223 (16), pp.1-8. ⟨10.1242/jeb.220699⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.220699 hal-03115200 https://hal.archives-ouvertes.fr/hal-03115200 doi:10.1242/jeb.220699 WOS: 000576694400003 |
op_doi |
https://doi.org/10.1242/jeb.220699 |
container_title |
Journal of Experimental Biology |
_version_ |
1766323064893603840 |