A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light
Blood was collected over a 24‐h period from free‐living adult Weddell seals that had been exposed to natural constant daylight for some 12 weeks. The plasma melatonin concentration was low throughout the trial (range of means: 30.8–70.4 pg/ml) with the exception of a 3‐h period centered on 1700 h lo...
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Language: | English |
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Wiley
1986
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crwiley:10.1111/j.1600-079x.1986.tb00735.x 2023-12-03T10:31:37+01:00 A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light Griffiths, D. J. Bryden, M. M. Kennaway, D. J. 1986 http://dx.doi.org/10.1111/j.1600-079x.1986.tb00735.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-079X.1986.tb00735.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-079X.1986.tb00735.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Pineal Research volume 3, issue 2, page 127-134 ISSN 0742-3098 1600-079X Endocrinology journal-article 1986 crwiley https://doi.org/10.1111/j.1600-079x.1986.tb00735.x 2023-11-09T13:35:19Z Blood was collected over a 24‐h period from free‐living adult Weddell seals that had been exposed to natural constant daylight for some 12 weeks. The plasma melatonin concentration was low throughout the trial (range of means: 30.8–70.4 pg/ml) with the exception of a 3‐h period centered on 1700 h local time, when the plasma level rose to a mean of 131.8 pg/ml. The pineal gland of the Weddell seal is thus capable of transient bouts of activity during constant and bright daylight, a situation usually inhibitory to the function of the gland. It is suggested that circadian fluctuations in the intensity of constant light entrain variation in the pineal gland functioning of this seal during summer. Article in Journal/Newspaper Weddell Seal Weddell Seals Wiley Online Library (via Crossref) Weddell Journal of Pineal Research 3 2 127 134 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Endocrinology |
spellingShingle |
Endocrinology Griffiths, D. J. Bryden, M. M. Kennaway, D. J. A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
topic_facet |
Endocrinology |
description |
Blood was collected over a 24‐h period from free‐living adult Weddell seals that had been exposed to natural constant daylight for some 12 weeks. The plasma melatonin concentration was low throughout the trial (range of means: 30.8–70.4 pg/ml) with the exception of a 3‐h period centered on 1700 h local time, when the plasma level rose to a mean of 131.8 pg/ml. The pineal gland of the Weddell seal is thus capable of transient bouts of activity during constant and bright daylight, a situation usually inhibitory to the function of the gland. It is suggested that circadian fluctuations in the intensity of constant light entrain variation in the pineal gland functioning of this seal during summer. |
format |
Article in Journal/Newspaper |
author |
Griffiths, D. J. Bryden, M. M. Kennaway, D. J. |
author_facet |
Griffiths, D. J. Bryden, M. M. Kennaway, D. J. |
author_sort |
Griffiths, D. J. |
title |
A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
title_short |
A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
title_full |
A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
title_fullStr |
A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
title_full_unstemmed |
A Fluctuation in Plasma Melatonin Level in the Weddell Seal During Constant Natural Light |
title_sort |
fluctuation in plasma melatonin level in the weddell seal during constant natural light |
publisher |
Wiley |
publishDate |
1986 |
url |
http://dx.doi.org/10.1111/j.1600-079x.1986.tb00735.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-079X.1986.tb00735.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-079X.1986.tb00735.x |
geographic |
Weddell |
geographic_facet |
Weddell |
genre |
Weddell Seal Weddell Seals |
genre_facet |
Weddell Seal Weddell Seals |
op_source |
Journal of Pineal Research volume 3, issue 2, page 127-134 ISSN 0742-3098 1600-079X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1600-079x.1986.tb00735.x |
container_title |
Journal of Pineal Research |
container_volume |
3 |
container_issue |
2 |
container_start_page |
127 |
op_container_end_page |
134 |
_version_ |
1784257969454579712 |