Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal.
Long-term fasting is a component of northern elephant seal (Mirounga angustirostris) life history requiring physiological adaptations to nitrogen conservation. Plasma free amino acids (FAAs) were determined for five elephant seal pups during the second and eighth weeks of the postweaning fast, six l...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Physiology and Biochemical Zoology
2004
|
Subjects: | |
Online Access: | http://hdl.handle.net/10211.1/1478 |
id |
ftcalifstateuniv:oai:scholarworks:np193986b |
---|---|
record_format |
openpolar |
spelling |
ftcalifstateuniv:oai:scholarworks:np193986b 2024-09-30T14:34:21+00:00 Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. Dorian S. Houser Daniel E. Crocker 2004 http://hdl.handle.net/10211.1/1478 English eng Physiology and Biochemical Zoology Physiological and Biochemical Zoology http://hdl.handle.net/10211.1/1478 fasting elephant seals seals Article 2004 ftcalifstateuniv 2024-09-10T17:06:15Z Long-term fasting is a component of northern elephant seal (Mirounga angustirostris) life history requiring physiological adaptations to nitrogen conservation. Plasma free amino acids (FAAs) were determined for five elephant seal pups during the second and eighth weeks of the postweaning fast, six lactating female seals at 4-6 and 25 d postpartum, and seven sexually competitive adult male seals taken midway through the breeding season. Total FAAs declined in lactating females (11%) and pups (30%) with time fasting, but cystine concentration more than doubled in pups while decreasing by ~43% in lactating females. Methionine concentration significantly increased (~68%) across lactation in adult females but was low for all males, and glycine became the dominant FAA in adult females late in lactation. Glutamine dominated the FAAs of the weaned pups across the fast. Reductions in the total FAAs of weanlings mirrored the reductions in protein catabolism, but reductions in total FAAs also occurred in lactating females concomitant with an increase in protein catabolism. Observed variation in FAA concentrations may reflect ontogenetic requirements for certain amino acids in fasting weanlings. Similarly, increases in specific FAA concentrations across lactation may reflect variations in FAA flux resulting from nutrient demands of lactogenesis. Published by and copyright by University of Chicago Press. Houser, D.S. and D.E. Crocker. "Age, sex, and reproductive state influence free amino acid concentrations in the fasting elephant seal". Physiological and Biochemical Zoology. 77.5 (2004):838-846. 1522-2152 Article in Journal/Newspaper Elephant Seal Elephant Seals Scholarworks from California State University |
institution |
Open Polar |
collection |
Scholarworks from California State University |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
fasting elephant seals seals |
spellingShingle |
fasting elephant seals seals Dorian S. Houser Daniel E. Crocker Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
topic_facet |
fasting elephant seals seals |
description |
Long-term fasting is a component of northern elephant seal (Mirounga angustirostris) life history requiring physiological adaptations to nitrogen conservation. Plasma free amino acids (FAAs) were determined for five elephant seal pups during the second and eighth weeks of the postweaning fast, six lactating female seals at 4-6 and 25 d postpartum, and seven sexually competitive adult male seals taken midway through the breeding season. Total FAAs declined in lactating females (11%) and pups (30%) with time fasting, but cystine concentration more than doubled in pups while decreasing by ~43% in lactating females. Methionine concentration significantly increased (~68%) across lactation in adult females but was low for all males, and glycine became the dominant FAA in adult females late in lactation. Glutamine dominated the FAAs of the weaned pups across the fast. Reductions in the total FAAs of weanlings mirrored the reductions in protein catabolism, but reductions in total FAAs also occurred in lactating females concomitant with an increase in protein catabolism. Observed variation in FAA concentrations may reflect ontogenetic requirements for certain amino acids in fasting weanlings. Similarly, increases in specific FAA concentrations across lactation may reflect variations in FAA flux resulting from nutrient demands of lactogenesis. Published by and copyright by University of Chicago Press. Houser, D.S. and D.E. Crocker. "Age, sex, and reproductive state influence free amino acid concentrations in the fasting elephant seal". Physiological and Biochemical Zoology. 77.5 (2004):838-846. 1522-2152 |
format |
Article in Journal/Newspaper |
author |
Dorian S. Houser Daniel E. Crocker |
author_facet |
Dorian S. Houser Daniel E. Crocker |
author_sort |
Dorian S. Houser |
title |
Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
title_short |
Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
title_full |
Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
title_fullStr |
Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
title_full_unstemmed |
Age, Sex, and Reproductive State Influence Free Amino Aid Concentrations in the Fasting elephant seal. |
title_sort |
age, sex, and reproductive state influence free amino aid concentrations in the fasting elephant seal. |
publisher |
Physiology and Biochemical Zoology |
publishDate |
2004 |
url |
http://hdl.handle.net/10211.1/1478 |
genre |
Elephant Seal Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals |
op_relation |
http://hdl.handle.net/10211.1/1478 |
_version_ |
1811637993662840832 |