ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT

Blood samples were obtained from adult female Weddell seals in McMurdo Sound, Antarctica, utilizing four different seals every 2 h for 24 h on two occasions in November 1987. Plasma levels of melatonin were mostly near zero, whereas the values for cortisol were high (2101 ± 54 and 1908 ± 108 (S.E.M....

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Published in:Journal of Endocrinology
Main Authors: BARRELL, GK, MONTGOMERY, GW
Format: Article in Journal/Newspaper
Language:English
Published: BIOSCIENTIFICA LTD 1989
Subjects:
Online Access:https://espace.library.uq.edu.au/view/UQ:719007
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spelling ftunivqespace:oai:espace.library.uq.edu.au:UQ:719007 2023-05-15T13:34:43+02:00 ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT BARRELL, GK MONTGOMERY, GW 1989-08-01 https://espace.library.uq.edu.au/view/UQ:719007 eng eng BIOSCIENTIFICA LTD doi:10.1677/joe.0.1220445 issn:0022-0795 orcid:0000-0002-4140-8139 Endocrinology Diabetes and Metabolism 1310 Endocrinology 2712 Endocrinology Journal Article 1989 ftunivqespace https://doi.org/10.1677/joe.0.1220445 2020-08-06T06:40:23Z Blood samples were obtained from adult female Weddell seals in McMurdo Sound, Antarctica, utilizing four different seals every 2 h for 24 h on two occasions in November 1987. Plasma levels of melatonin were mostly near zero, whereas the values for cortisol were high (2101 ± 54 and 1908 ± 108 (S.E.M.) nmol/l, n = 52). For both hormones there was no evidence of a diurnal pattern of secretion. Juvenile seals sampled in December 1985 also had no evidence of a diurnal secretion pattern of melatonin, but blood levels of melatonin were higher than in adults. The results indicate that secretion of melatonin in adult Weddell seals ceases during the Antarctic summer. Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Sound Weddell Seals The University of Queensland: UQ eSpace Antarctic McMurdo Sound The Antarctic Weddell Journal of Endocrinology 122 2 445 449
institution Open Polar
collection The University of Queensland: UQ eSpace
op_collection_id ftunivqespace
language English
topic Endocrinology
Diabetes and Metabolism
1310 Endocrinology
2712 Endocrinology
spellingShingle Endocrinology
Diabetes and Metabolism
1310 Endocrinology
2712 Endocrinology
BARRELL, GK
MONTGOMERY, GW
ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
topic_facet Endocrinology
Diabetes and Metabolism
1310 Endocrinology
2712 Endocrinology
description Blood samples were obtained from adult female Weddell seals in McMurdo Sound, Antarctica, utilizing four different seals every 2 h for 24 h on two occasions in November 1987. Plasma levels of melatonin were mostly near zero, whereas the values for cortisol were high (2101 ± 54 and 1908 ± 108 (S.E.M.) nmol/l, n = 52). For both hormones there was no evidence of a diurnal pattern of secretion. Juvenile seals sampled in December 1985 also had no evidence of a diurnal secretion pattern of melatonin, but blood levels of melatonin were higher than in adults. The results indicate that secretion of melatonin in adult Weddell seals ceases during the Antarctic summer.
format Article in Journal/Newspaper
author BARRELL, GK
MONTGOMERY, GW
author_facet BARRELL, GK
MONTGOMERY, GW
author_sort BARRELL, GK
title ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
title_short ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
title_full ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
title_fullStr ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
title_full_unstemmed ABSENCE OF CIRCADIAN PATTERNS OF SECRETION OF MELATONIN OR CORTISOL IN WEDDELL SEALS UNDER CONTINUOUS NATURAL DAYLIGHT
title_sort absence of circadian patterns of secretion of melatonin or cortisol in weddell seals under continuous natural daylight
publisher BIOSCIENTIFICA LTD
publishDate 1989
url https://espace.library.uq.edu.au/view/UQ:719007
geographic Antarctic
McMurdo Sound
The Antarctic
Weddell
geographic_facet Antarctic
McMurdo Sound
The Antarctic
Weddell
genre Antarc*
Antarctic
Antarctica
McMurdo Sound
Weddell Seals
genre_facet Antarc*
Antarctic
Antarctica
McMurdo Sound
Weddell Seals
op_relation doi:10.1677/joe.0.1220445
issn:0022-0795
orcid:0000-0002-4140-8139
op_doi https://doi.org/10.1677/joe.0.1220445
container_title Journal of Endocrinology
container_volume 122
container_issue 2
container_start_page 445
op_container_end_page 449
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