Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model
A combination of timing of and body condition (i.e., mass) at arrival on the breeding grounds interact to influence the optimal combination of the timing of reproduction and clutch size in migratory species. This relationship has been formalized by Rowe et al. in a condition-dependent individual opt...
Published in: | Functional Ecology |
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Scholarship at UWindsor
2018
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Online Access: | https://scholar.uwindsor.ca/glierpub/508 https://doi.org/10.1111/1365-2435.13133 https://scholar.uwindsor.ca/context/glierpub/article/1510/viewcontent/hennin.pdf |
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ftunivwindsor:oai:scholar.uwindsor.ca:glierpub-1510 2023-06-11T04:09:59+02:00 Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model Hennin, Holly L. Dey, Cody J. Bêty, Joël Gilchrist, H. Grant Legagneux, Pierre Williams, Tony D. Love, Oliver P. 2018-08-01T07:00:00Z application/pdf https://scholar.uwindsor.ca/glierpub/508 https://doi.org/10.1111/1365-2435.13133 https://scholar.uwindsor.ca/context/glierpub/article/1510/viewcontent/hennin.pdf unknown Scholarship at UWindsor https://scholar.uwindsor.ca/glierpub/508 doi:10.1111/1365-2435.13133 https://scholar.uwindsor.ca/context/glierpub/article/1510/viewcontent/hennin.pdf Great Lakes Institute for Environmental Research Publications clutch size common eider condition gain fattening rate individual optimization laying date path analysis triglyceride Biochemistry Biophysics and Structural Biology Biodiversity Biology Life Sciences Marine Biology text 2018 ftunivwindsor https://doi.org/10.1111/1365-2435.13133 2023-05-06T19:11:20Z A combination of timing of and body condition (i.e., mass) at arrival on the breeding grounds interact to influence the optimal combination of the timing of reproduction and clutch size in migratory species. This relationship has been formalized by Rowe et al. in a condition-dependent individual optimization model (American Naturalist, 1994, 143, 689-722), which has been empirically tested and validated in avian species with a capital-based breeding strategy. This model makes a key, but currently untested prediction; that variation in the rate of body condition gain will shift the optimal combination of laying date and clutch size. This prediction is essential because it implies that individuals can compensate for the challenges associated with late timing of arrival or poor body condition at arrival on the breeding grounds through adjustment of their life history investment decisions, in an attempt to maximize fitness. Using an 11-year data set in arctic-nesting common eiders (Somateria mollissima), quantification of fattening rates using plasma triglycerides (an energetic metabolite), and a path analysis approach, we test this prediction of this optimization model; controlling for arrival date and body condition, females that fatten more quickly will adjust the optimal combination of lay date and clutch size, in favour of a larger clutch size. As predicted, females fattening at higher rates initiated clutches earlier and produced larger clutch sizes, indicating that fattening rate is an important factor in addition to arrival date and body condition in predicting individual variation in reproductive investment. However, there was no direct effect of fattening rate on clutch size (i.e., birds laying on the same date had similar clutch sizes, independent of their fattening rate). Instead, fattening rate indirectly affected clutch size via earlier lay dates, thus not supporting the original predictions of the optimization model. Our results demonstrate that variation in the rate of condition gain allows ... Text Arctic Common Eider Somateria mollissima University of Windsor, Ontario: Scholarship at UWindsor Arctic Rowe ENVELOPE(-60.904,-60.904,-62.592,-62.592) Functional Ecology 32 8 2019 2028 |
institution |
Open Polar |
collection |
University of Windsor, Ontario: Scholarship at UWindsor |
op_collection_id |
ftunivwindsor |
language |
unknown |
topic |
clutch size common eider condition gain fattening rate individual optimization laying date path analysis triglyceride Biochemistry Biophysics and Structural Biology Biodiversity Biology Life Sciences Marine Biology |
spellingShingle |
clutch size common eider condition gain fattening rate individual optimization laying date path analysis triglyceride Biochemistry Biophysics and Structural Biology Biodiversity Biology Life Sciences Marine Biology Hennin, Holly L. Dey, Cody J. Bêty, Joël Gilchrist, H. Grant Legagneux, Pierre Williams, Tony D. Love, Oliver P. Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
topic_facet |
clutch size common eider condition gain fattening rate individual optimization laying date path analysis triglyceride Biochemistry Biophysics and Structural Biology Biodiversity Biology Life Sciences Marine Biology |
description |
A combination of timing of and body condition (i.e., mass) at arrival on the breeding grounds interact to influence the optimal combination of the timing of reproduction and clutch size in migratory species. This relationship has been formalized by Rowe et al. in a condition-dependent individual optimization model (American Naturalist, 1994, 143, 689-722), which has been empirically tested and validated in avian species with a capital-based breeding strategy. This model makes a key, but currently untested prediction; that variation in the rate of body condition gain will shift the optimal combination of laying date and clutch size. This prediction is essential because it implies that individuals can compensate for the challenges associated with late timing of arrival or poor body condition at arrival on the breeding grounds through adjustment of their life history investment decisions, in an attempt to maximize fitness. Using an 11-year data set in arctic-nesting common eiders (Somateria mollissima), quantification of fattening rates using plasma triglycerides (an energetic metabolite), and a path analysis approach, we test this prediction of this optimization model; controlling for arrival date and body condition, females that fatten more quickly will adjust the optimal combination of lay date and clutch size, in favour of a larger clutch size. As predicted, females fattening at higher rates initiated clutches earlier and produced larger clutch sizes, indicating that fattening rate is an important factor in addition to arrival date and body condition in predicting individual variation in reproductive investment. However, there was no direct effect of fattening rate on clutch size (i.e., birds laying on the same date had similar clutch sizes, independent of their fattening rate). Instead, fattening rate indirectly affected clutch size via earlier lay dates, thus not supporting the original predictions of the optimization model. Our results demonstrate that variation in the rate of condition gain allows ... |
format |
Text |
author |
Hennin, Holly L. Dey, Cody J. Bêty, Joël Gilchrist, H. Grant Legagneux, Pierre Williams, Tony D. Love, Oliver P. |
author_facet |
Hennin, Holly L. Dey, Cody J. Bêty, Joël Gilchrist, H. Grant Legagneux, Pierre Williams, Tony D. Love, Oliver P. |
author_sort |
Hennin, Holly L. |
title |
Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
title_short |
Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
title_full |
Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
title_fullStr |
Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
title_full_unstemmed |
Higher rates of prebreeding condition gain positively impacts clutch size: A mechanistic test of the condition-dependent individual optimization model |
title_sort |
higher rates of prebreeding condition gain positively impacts clutch size: a mechanistic test of the condition-dependent individual optimization model |
publisher |
Scholarship at UWindsor |
publishDate |
2018 |
url |
https://scholar.uwindsor.ca/glierpub/508 https://doi.org/10.1111/1365-2435.13133 https://scholar.uwindsor.ca/context/glierpub/article/1510/viewcontent/hennin.pdf |
long_lat |
ENVELOPE(-60.904,-60.904,-62.592,-62.592) |
geographic |
Arctic Rowe |
geographic_facet |
Arctic Rowe |
genre |
Arctic Common Eider Somateria mollissima |
genre_facet |
Arctic Common Eider Somateria mollissima |
op_source |
Great Lakes Institute for Environmental Research Publications |
op_relation |
https://scholar.uwindsor.ca/glierpub/508 doi:10.1111/1365-2435.13133 https://scholar.uwindsor.ca/context/glierpub/article/1510/viewcontent/hennin.pdf |
op_doi |
https://doi.org/10.1111/1365-2435.13133 |
container_title |
Functional Ecology |
container_volume |
32 |
container_issue |
8 |
container_start_page |
2019 |
op_container_end_page |
2028 |
_version_ |
1768384042042916864 |