Rapid postnatal development of myoglobin from large liver iron stores in hooded seals
Hooded seals ( Cystophora cristata ) rely on large stores of oxygen, either bound to hemoglobin or myoglobin (Mb), to support prolonged diving activity. Pups are born with fully developed hemoglobin stores, but their Mb levels are only 25–30% of adult levels. We measured changes in muscle [Mb] from...
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fthighwire:oai:open-archive.highwire.org:jexbio:216/10/1793 2023-05-15T15:59:54+02:00 Rapid postnatal development of myoglobin from large liver iron stores in hooded seals Geiseler, Samuel J. Blix, Arnoldus S. Burns, Jennifer M. Folkow, Lars P. 2013-05-15 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/216/10/1793 https://doi.org/10.1242/jeb.082099 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/216/10/1793 http://dx.doi.org/10.1242/jeb.082099 Copyright (C) 2013, Company of Biologists Research Articles TEXT 2013 fthighwire https://doi.org/10.1242/jeb.082099 2013-05-27T01:19:03Z Hooded seals ( Cystophora cristata ) rely on large stores of oxygen, either bound to hemoglobin or myoglobin (Mb), to support prolonged diving activity. Pups are born with fully developed hemoglobin stores, but their Mb levels are only 25–30% of adult levels. We measured changes in muscle [Mb] from birth to 1 year of age in two groups of captive hooded seal pups, one being maintained in a seawater pool and one on land during the first 2 months. All pups fasted during the first month, but were fed from then on. The [Mb] of the swimming muscle musculus longissimus dorsi (LD) doubled during the month of fasting in the pool group. These animals had significantly higher levels and a more rapid rise in LD [Mb] than those kept on land. The [Mb] of the shoulder muscle, m. supraspinatus, which is less active in both swimming and hauled-out animals, was consistently lower than in the LD and did not differ between groups. This suggests that a major part of the postnatal rise in LD [Mb] is triggered by (swimming) activity, and this coincides with the previously reported rapid early development of diving capacity in wild hooded seal pups. Liver iron concentration, as determined from another 25 hooded seals of various ages, was almost 10 times higher in young pups (1–34 days) than in yearling animals and adults, and liver iron content of pups dropped during the first month, implying that liver iron stores support the rapid initial rise in [Mb]. Text Cystophora cristata hooded seal HighWire Press (Stanford University) Journal of Experimental Biology |
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Research Articles Geiseler, Samuel J. Blix, Arnoldus S. Burns, Jennifer M. Folkow, Lars P. Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
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Research Articles |
description |
Hooded seals ( Cystophora cristata ) rely on large stores of oxygen, either bound to hemoglobin or myoglobin (Mb), to support prolonged diving activity. Pups are born with fully developed hemoglobin stores, but their Mb levels are only 25–30% of adult levels. We measured changes in muscle [Mb] from birth to 1 year of age in two groups of captive hooded seal pups, one being maintained in a seawater pool and one on land during the first 2 months. All pups fasted during the first month, but were fed from then on. The [Mb] of the swimming muscle musculus longissimus dorsi (LD) doubled during the month of fasting in the pool group. These animals had significantly higher levels and a more rapid rise in LD [Mb] than those kept on land. The [Mb] of the shoulder muscle, m. supraspinatus, which is less active in both swimming and hauled-out animals, was consistently lower than in the LD and did not differ between groups. This suggests that a major part of the postnatal rise in LD [Mb] is triggered by (swimming) activity, and this coincides with the previously reported rapid early development of diving capacity in wild hooded seal pups. Liver iron concentration, as determined from another 25 hooded seals of various ages, was almost 10 times higher in young pups (1–34 days) than in yearling animals and adults, and liver iron content of pups dropped during the first month, implying that liver iron stores support the rapid initial rise in [Mb]. |
format |
Text |
author |
Geiseler, Samuel J. Blix, Arnoldus S. Burns, Jennifer M. Folkow, Lars P. |
author_facet |
Geiseler, Samuel J. Blix, Arnoldus S. Burns, Jennifer M. Folkow, Lars P. |
author_sort |
Geiseler, Samuel J. |
title |
Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
title_short |
Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
title_full |
Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
title_fullStr |
Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
title_full_unstemmed |
Rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
title_sort |
rapid postnatal development of myoglobin from large liver iron stores in hooded seals |
publisher |
Company of Biologists |
publishDate |
2013 |
url |
http://jeb.biologists.org/cgi/content/short/216/10/1793 https://doi.org/10.1242/jeb.082099 |
genre |
Cystophora cristata hooded seal |
genre_facet |
Cystophora cristata hooded seal |
op_relation |
http://jeb.biologists.org/cgi/content/short/216/10/1793 http://dx.doi.org/10.1242/jeb.082099 |
op_rights |
Copyright (C) 2013, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.082099 |
container_title |
Journal of Experimental Biology |
_version_ |
1766395789156810752 |