Baseline glucocorticoids are drivers of body mass gain in a diving seabird
Lifeâ€history tradeâ€offs are influenced by variation in individual state, with individuals in better condition often completing lifeâ€history stages with greater success. Although resource accrual significantly impacts key lifeâ€history decisions such as the timing of reproduction, little is known...
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ftunivwindsor:oai:scholar.uwindsor.ca:biologypub-2043 2024-09-15T18:18:28+00:00 Baseline glucocorticoids are drivers of body mass gain in a diving seabird Hennin, Holly L. Wells-Berlin, Alicia M. Love, Oliver P. 2016-01-01T08:00:00Z application/pdf https://scholar.uwindsor.ca/biologypub/1043 https://doi.org/10.1002/ece3.1999 https://scholar.uwindsor.ca/context/biologypub/article/2043/viewcontent/Hennin_et_al.___2016___Baseline_glucocorticoids_are_drivers_of_body_mass_.pdf unknown Scholarship at UWindsor https://scholar.uwindsor.ca/biologypub/1043 doi:10.1002/ece3.1999 https://scholar.uwindsor.ca/context/biologypub/article/2043/viewcontent/Hennin_et_al.___2016___Baseline_glucocorticoids_are_drivers_of_body_mass_.pdf Biological Sciences Publications Biology Life Sciences text 2016 ftunivwindsor https://doi.org/10.1002/ece3.1999 2024-07-05T03:39:26Z Lifeâ€history tradeâ€offs are influenced by variation in individual state, with individuals in better condition often completing lifeâ€history stages with greater success. Although resource accrual significantly impacts key lifeâ€history decisions such as the timing of reproduction, little is known about the underlying mechanisms driving resource accumulation. Baseline corticosterone (CORT, the primary avian glucocorticoid) mediates daily and seasonal energetics, responds to changes in food availability, and has been linked to foraging behavior, making it a strong potential driver of individual variation in resource accrual and deposition. Working with a captive colony of whiteâ€winged scoters (Melanitta fusca deglandi), we aimed to causally determine whether variation in baseline CORT drives individual body mass gains mediated through fattening rate (plasma triglycerides corrected for body mass). We implanted individuals with each of three treatment pellets to elevate CORT within a baseline range in a randomized order: control, low dose of CORT, high dose of CORT, then blood sampled and recorded body mass over a twoâ€week period to track changes in baseline CORT, body mass, and fattening rates. The high CORT treatment significantly elevated levels of plasma hormone for a short period of time within the biologically relevant, baseline range for this species, but importantly did not inhibit the function of the HPA (hypothalamic–pituitary–adrenal) axis. Furthermore, an elevation in baseline CORT resulted in a consistent increase in body mass throughout the trial period compared to controls. This is some of the first empirical evidence demonstrating that elevations of baseline CORT within a biologically relevant range have a causal, direct, and positive influence on changes in body mass. Text Melanitta fusca University of Windsor, Ontario: Scholarship at UWindsor Ecology and Evolution 6 6 1702 1711 |
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University of Windsor, Ontario: Scholarship at UWindsor |
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ftunivwindsor |
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topic |
Biology Life Sciences |
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Biology Life Sciences Hennin, Holly L. Wells-Berlin, Alicia M. Love, Oliver P. Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
topic_facet |
Biology Life Sciences |
description |
Lifeâ€history tradeâ€offs are influenced by variation in individual state, with individuals in better condition often completing lifeâ€history stages with greater success. Although resource accrual significantly impacts key lifeâ€history decisions such as the timing of reproduction, little is known about the underlying mechanisms driving resource accumulation. Baseline corticosterone (CORT, the primary avian glucocorticoid) mediates daily and seasonal energetics, responds to changes in food availability, and has been linked to foraging behavior, making it a strong potential driver of individual variation in resource accrual and deposition. Working with a captive colony of whiteâ€winged scoters (Melanitta fusca deglandi), we aimed to causally determine whether variation in baseline CORT drives individual body mass gains mediated through fattening rate (plasma triglycerides corrected for body mass). We implanted individuals with each of three treatment pellets to elevate CORT within a baseline range in a randomized order: control, low dose of CORT, high dose of CORT, then blood sampled and recorded body mass over a twoâ€week period to track changes in baseline CORT, body mass, and fattening rates. The high CORT treatment significantly elevated levels of plasma hormone for a short period of time within the biologically relevant, baseline range for this species, but importantly did not inhibit the function of the HPA (hypothalamic–pituitary–adrenal) axis. Furthermore, an elevation in baseline CORT resulted in a consistent increase in body mass throughout the trial period compared to controls. This is some of the first empirical evidence demonstrating that elevations of baseline CORT within a biologically relevant range have a causal, direct, and positive influence on changes in body mass. |
format |
Text |
author |
Hennin, Holly L. Wells-Berlin, Alicia M. Love, Oliver P. |
author_facet |
Hennin, Holly L. Wells-Berlin, Alicia M. Love, Oliver P. |
author_sort |
Hennin, Holly L. |
title |
Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
title_short |
Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
title_full |
Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
title_fullStr |
Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
title_full_unstemmed |
Baseline glucocorticoids are drivers of body mass gain in a diving seabird |
title_sort |
baseline glucocorticoids are drivers of body mass gain in a diving seabird |
publisher |
Scholarship at UWindsor |
publishDate |
2016 |
url |
https://scholar.uwindsor.ca/biologypub/1043 https://doi.org/10.1002/ece3.1999 https://scholar.uwindsor.ca/context/biologypub/article/2043/viewcontent/Hennin_et_al.___2016___Baseline_glucocorticoids_are_drivers_of_body_mass_.pdf |
genre |
Melanitta fusca |
genre_facet |
Melanitta fusca |
op_source |
Biological Sciences Publications |
op_relation |
https://scholar.uwindsor.ca/biologypub/1043 doi:10.1002/ece3.1999 https://scholar.uwindsor.ca/context/biologypub/article/2043/viewcontent/Hennin_et_al.___2016___Baseline_glucocorticoids_are_drivers_of_body_mass_.pdf |
op_doi |
https://doi.org/10.1002/ece3.1999 |
container_title |
Ecology and Evolution |
container_volume |
6 |
container_issue |
6 |
container_start_page |
1702 |
op_container_end_page |
1711 |
_version_ |
1810456597759000576 |