Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers
Arctic environments are challenging for circadian systems. Around the solstices, the most important zeitgeber, the change between night and day, is reduced to minor fluctuations in light intensities. However, many species including songbirds nonetheless show clear diel activity patterns. Here we exa...
Published in: | Hormones and Behavior |
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Online Access: | http://hdl.handle.net/11392/1377336 https://doi.org/10.1016/j.yhbeh.2009.04.002 |
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ftunivferrarair:oai:iris.unife.it:11392/1377336 2024-02-11T10:00:04+01:00 Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers B. Silverin E. Gwinner T. V. Hof I. Schwabl M. Hau B. Helm FUSANI, Leonida B., Silverin E., Gwinner T. V., Hof I., Schwabl Fusani, Leonida M., Hau B., Helm 2009 STAMPA http://hdl.handle.net/11392/1377336 https://doi.org/10.1016/j.yhbeh.2009.04.002 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000266846100021 volume:56 issue:1 firstpage:163 lastpage:168 numberofpages:5 journal:HORMONES AND BEHAVIOR http://hdl.handle.net/11392/1377336 doi:10.1016/j.yhbeh.2009.04.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-67349156667 usr_valut Arctic Bird Circadian Diel Melatonin Willow warbler info:eu-repo/semantics/article 2009 ftunivferrarair https://doi.org/10.1016/j.yhbeh.2009.04.002 2024-01-24T17:34:56Z Arctic environments are challenging for circadian systems. Around the solstices, the most important zeitgeber, the change between night and day, is reduced to minor fluctuations in light intensities. However, many species including songbirds nonetheless show clear diel activity patterns. Here we examine the possible physiological basis underlying diel rhythmicity under continuous Arctic summer light. Rhythmic secretion of the hormone melatonin constitutes an important part of the songbird circadian system and its experimental suppression, e.g., by constant light, usually leads to behavioral arrhythmia. We therefore studied melatonin patterns in a free-living migratory songbird, the willow warbler (Phylloscopus trochilus), that maintains diel activity during the Arctic summer. We compared melatonin profiles during late spring and summer solstice in two Swedish populations from the south (58°N) and near the Arctic circle (66°N).We found the northern Swedish population maintained clear diel changes in melatonin secretion during the summer solstice, although peak concentrations were lower than in southern Sweden. Melatonin levels were highest before midnight and in good accordance with periods of reduced activity. The maintenance of diel melatonin rhythmicity under conditions of continuous light may be one of the physiological mechanisms that enables continued functioning of the circadian system. Article in Journal/Newspaper Arctic Università degli Studi di Ferrara: CINECA IRIS Arctic Hormones and Behavior 56 1 163 168 |
institution |
Open Polar |
collection |
Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Arctic Bird Circadian Diel Melatonin Willow warbler |
spellingShingle |
Arctic Bird Circadian Diel Melatonin Willow warbler B. Silverin E. Gwinner T. V. Hof I. Schwabl M. Hau B. Helm FUSANI, Leonida Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
topic_facet |
Arctic Bird Circadian Diel Melatonin Willow warbler |
description |
Arctic environments are challenging for circadian systems. Around the solstices, the most important zeitgeber, the change between night and day, is reduced to minor fluctuations in light intensities. However, many species including songbirds nonetheless show clear diel activity patterns. Here we examine the possible physiological basis underlying diel rhythmicity under continuous Arctic summer light. Rhythmic secretion of the hormone melatonin constitutes an important part of the songbird circadian system and its experimental suppression, e.g., by constant light, usually leads to behavioral arrhythmia. We therefore studied melatonin patterns in a free-living migratory songbird, the willow warbler (Phylloscopus trochilus), that maintains diel activity during the Arctic summer. We compared melatonin profiles during late spring and summer solstice in two Swedish populations from the south (58°N) and near the Arctic circle (66°N).We found the northern Swedish population maintained clear diel changes in melatonin secretion during the summer solstice, although peak concentrations were lower than in southern Sweden. Melatonin levels were highest before midnight and in good accordance with periods of reduced activity. The maintenance of diel melatonin rhythmicity under conditions of continuous light may be one of the physiological mechanisms that enables continued functioning of the circadian system. |
author2 |
B., Silverin E., Gwinner T. V., Hof I., Schwabl Fusani, Leonida M., Hau B., Helm |
format |
Article in Journal/Newspaper |
author |
B. Silverin E. Gwinner T. V. Hof I. Schwabl M. Hau B. Helm FUSANI, Leonida |
author_facet |
B. Silverin E. Gwinner T. V. Hof I. Schwabl M. Hau B. Helm FUSANI, Leonida |
author_sort |
B. Silverin |
title |
Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
title_short |
Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
title_full |
Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
title_fullStr |
Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
title_full_unstemmed |
Persistent diel melatonin rhythmicity during the Arctic summer in free-living willow warblers |
title_sort |
persistent diel melatonin rhythmicity during the arctic summer in free-living willow warblers |
publishDate |
2009 |
url |
http://hdl.handle.net/11392/1377336 https://doi.org/10.1016/j.yhbeh.2009.04.002 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000266846100021 volume:56 issue:1 firstpage:163 lastpage:168 numberofpages:5 journal:HORMONES AND BEHAVIOR http://hdl.handle.net/11392/1377336 doi:10.1016/j.yhbeh.2009.04.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-67349156667 usr_valut |
op_doi |
https://doi.org/10.1016/j.yhbeh.2009.04.002 |
container_title |
Hormones and Behavior |
container_volume |
56 |
container_issue |
1 |
container_start_page |
163 |
op_container_end_page |
168 |
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1790595780454645760 |