Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella)
Plasma leptin levels were determined in 8 lactating female and 20 pup Antarctic fur seals ( Arctocephalus gazella ) during fasting periods of normal duration. Plasma leptin levels ranged from 1.35-3.19 ng·ml -1 in lactating females and 1.79-4.80 ng·ml -1 in pups and were not positively correlated wi...
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ftdeakinunifig:oai:figshare.com:article/20577411 2023-05-15T14:01:50+02:00 Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) John Arnould M Morris D Rawlins I Boyd 2002-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30015948 https://figshare.com/articles/journal_contribution/Variation_in_plasma_leptin_levels_in_response_to_fasting_in_Antarctic_fur_seals_Arctocephalus_gazella_/20577411 unknown http://hdl.handle.net/10536/DRO/DU:30015948 https://figshare.com/articles/journal_contribution/Variation_in_plasma_leptin_levels_in_response_to_fasting_in_Antarctic_fur_seals_Arctocephalus_gazella_/20577411 All Rights Reserved Physiology Zoology pinnipeds fasting leptin triglyceride cholesterol Science & Technology Life Sciences & Biomedicine OB MESSENGER-RNA BODY-FAT MASS FOOD-INTAKE LACTATION MILK EXPRESSION PROTEIN GENDER DIET REPRODUCTION Text Journal contribution 2002 ftdeakinunifig 2022-11-17T22:57:10Z Plasma leptin levels were determined in 8 lactating female and 20 pup Antarctic fur seals ( Arctocephalus gazella ) during fasting periods of normal duration. Plasma leptin levels ranged from 1.35-3.19 ng·ml -1 in lactating females and 1.79-4.80 ng·ml -1 in pups and were not positively correlated with body mass or condition. A negative trend, however, was observed between plasma leptin levels and body condition in lactating females upon their arrival at the colony following a foraging trip (beginning of fast). In accordance with findings in other species, plasma leptin levels dropped significantly (P<0.02) in response to the 17-19% drop in body mass experienced by pups during fasting. In contrast, plasma leptin levels in lactating females increased during the first 24 h of fasting before decreasing throughout the remaining 48 h of the fast. This unexpected result could be due to the high level of energy expenditure by seals as they swim back to the colony (i.e. post-exercise response) or may be influenced by the intense suckling activity experienced by females during the onshore fasting periods. The results of this study support recent findings in other carnivore species which suggest the primary physiological role of leptin in these species may not necessarily be as a signal of the magnitude of body energy reserves. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella DRO - Deakin Research Online Antarctic 20 Pup ENVELOPE(-139.146,-139.146,64.023,64.023) |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Physiology Zoology pinnipeds fasting leptin triglyceride cholesterol Science & Technology Life Sciences & Biomedicine OB MESSENGER-RNA BODY-FAT MASS FOOD-INTAKE LACTATION MILK EXPRESSION PROTEIN GENDER DIET REPRODUCTION |
spellingShingle |
Physiology Zoology pinnipeds fasting leptin triglyceride cholesterol Science & Technology Life Sciences & Biomedicine OB MESSENGER-RNA BODY-FAT MASS FOOD-INTAKE LACTATION MILK EXPRESSION PROTEIN GENDER DIET REPRODUCTION John Arnould M Morris D Rawlins I Boyd Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
topic_facet |
Physiology Zoology pinnipeds fasting leptin triglyceride cholesterol Science & Technology Life Sciences & Biomedicine OB MESSENGER-RNA BODY-FAT MASS FOOD-INTAKE LACTATION MILK EXPRESSION PROTEIN GENDER DIET REPRODUCTION |
description |
Plasma leptin levels were determined in 8 lactating female and 20 pup Antarctic fur seals ( Arctocephalus gazella ) during fasting periods of normal duration. Plasma leptin levels ranged from 1.35-3.19 ng·ml -1 in lactating females and 1.79-4.80 ng·ml -1 in pups and were not positively correlated with body mass or condition. A negative trend, however, was observed between plasma leptin levels and body condition in lactating females upon their arrival at the colony following a foraging trip (beginning of fast). In accordance with findings in other species, plasma leptin levels dropped significantly (P<0.02) in response to the 17-19% drop in body mass experienced by pups during fasting. In contrast, plasma leptin levels in lactating females increased during the first 24 h of fasting before decreasing throughout the remaining 48 h of the fast. This unexpected result could be due to the high level of energy expenditure by seals as they swim back to the colony (i.e. post-exercise response) or may be influenced by the intense suckling activity experienced by females during the onshore fasting periods. The results of this study support recent findings in other carnivore species which suggest the primary physiological role of leptin in these species may not necessarily be as a signal of the magnitude of body energy reserves. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
John Arnould M Morris D Rawlins I Boyd |
author_facet |
John Arnould M Morris D Rawlins I Boyd |
author_sort |
John Arnould |
title |
Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
title_short |
Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
title_full |
Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
title_fullStr |
Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
title_full_unstemmed |
Variation in plasma leptin levels in response to fasting in Antarctic fur seals (Arctocephalus gazella) |
title_sort |
variation in plasma leptin levels in response to fasting in antarctic fur seals (arctocephalus gazella) |
publishDate |
2002 |
url |
http://hdl.handle.net/10536/DRO/DU:30015948 https://figshare.com/articles/journal_contribution/Variation_in_plasma_leptin_levels_in_response_to_fasting_in_Antarctic_fur_seals_Arctocephalus_gazella_/20577411 |
long_lat |
ENVELOPE(-139.146,-139.146,64.023,64.023) |
geographic |
Antarctic 20 Pup |
geographic_facet |
Antarctic 20 Pup |
genre |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30015948 https://figshare.com/articles/journal_contribution/Variation_in_plasma_leptin_levels_in_response_to_fasting_in_Antarctic_fur_seals_Arctocephalus_gazella_/20577411 |
op_rights |
All Rights Reserved |
_version_ |
1766271897318719488 |