Flight metabolism in a migrant bird
This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fat...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1084.2497 2023-05-15T15:48:27+02:00 Flight metabolism in a migrant bird S Jenni-Eiermann The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.2497 http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.2497 http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf text 2002 ftciteseerx 2020-05-03T00:29:57Z This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10 h). Triglyceride levels, the estimated concentration of very-low-density lipoproteins (VLDLs) and β-hydroxybutyrate levels were lower during flight, while glucose levels did not change. In flying birds, plasma levels of uric acid and lipid catabolites were positively correlated with the residual variation in body mass loss, and lipid catabolites with energy expenditure (as measured using the doubly labelled water method), after removing the effect of initial body mass. The plasma metabolite levels indicate: (i) that the rates of catabolism of lipids from adipose tissue and of protein are higher during flight; (ii) that low ketone body concentrations probably facilitate fatty acid release from adipose tissue; (iii) that low triglyceride and VLDL levels do not indicate the use of an additional pathway of fatty acid delivery, as found in small birds; and (iv) that the relationships between energy expenditure, body mass loss and metabolic pattern suggest that a higher individual energy expenditure entails a higher rate of catabolism of both lipids and protein and not a shift in fuel substrate. Text Calidris canutus Unknown |
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ftciteseerx |
language |
English |
description |
This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10 h). Triglyceride levels, the estimated concentration of very-low-density lipoproteins (VLDLs) and β-hydroxybutyrate levels were lower during flight, while glucose levels did not change. In flying birds, plasma levels of uric acid and lipid catabolites were positively correlated with the residual variation in body mass loss, and lipid catabolites with energy expenditure (as measured using the doubly labelled water method), after removing the effect of initial body mass. The plasma metabolite levels indicate: (i) that the rates of catabolism of lipids from adipose tissue and of protein are higher during flight; (ii) that low ketone body concentrations probably facilitate fatty acid release from adipose tissue; (iii) that low triglyceride and VLDL levels do not indicate the use of an additional pathway of fatty acid delivery, as found in small birds; and (iv) that the relationships between energy expenditure, body mass loss and metabolic pattern suggest that a higher individual energy expenditure entails a higher rate of catabolism of both lipids and protein and not a shift in fuel substrate. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
S Jenni-Eiermann |
spellingShingle |
S Jenni-Eiermann Flight metabolism in a migrant bird |
author_facet |
S Jenni-Eiermann |
author_sort |
S |
title |
Flight metabolism in a migrant bird |
title_short |
Flight metabolism in a migrant bird |
title_full |
Flight metabolism in a migrant bird |
title_fullStr |
Flight metabolism in a migrant bird |
title_full_unstemmed |
Flight metabolism in a migrant bird |
title_sort |
flight metabolism in a migrant bird |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.2497 http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf |
genre |
Calidris canutus |
genre_facet |
Calidris canutus |
op_source |
http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1084.2497 http://www.avibirds.com/pdf/K/Kanoetstrandloper2.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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