The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird
International audience Current food supply is a major driver of timing of breeding in income-breeding animals, likely because increased net energy balance directly increases reproductive hormones and advances breeding. In capital breeders, increased net energy balance increases energy reserves, whic...
Published in: | Hormones and Behavior |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://hal.archives-ouvertes.fr/hal-03009320 https://doi.org/10.1016/j.yhbeh.2020.104874 |
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ftccsdartic:oai:HAL:hal-03009320v1 2023-05-15T18:07:12+02:00 The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird Whelan, Shannon Hatch, Scott, Benowitz-Fredericks, Z, Parenteau, Charline Chastel, Olivier Elliott, Kyle McGill University = Université McGill Montréal, Canada Institute for Seabird Research and Conservation Institut for Searbird Research and Conservation Bucknell University Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2021-01 https://hal.archives-ouvertes.fr/hal-03009320 https://doi.org/10.1016/j.yhbeh.2020.104874 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.yhbeh.2020.104874 hal-03009320 https://hal.archives-ouvertes.fr/hal-03009320 doi:10.1016/j.yhbeh.2020.104874 ISSN: 0018-506X EISSN: 1095-6867 Hormones and Behavior https://hal.archives-ouvertes.fr/hal-03009320 Hormones and Behavior, Elsevier, 2021, 127, pp.104874. ⟨10.1016/j.yhbeh.2020.104874⟩ Testosterone Radioimmunoassay Phenotypic flexibility Nutritional stress HPG axis HPA axis Hidden Markov model Luteinising hormone-releasing hormone GnRH challenge Energy expenditure [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1016/j.yhbeh.2020.104874 2021-10-24T00:24:10Z International audience Current food supply is a major driver of timing of breeding in income-breeding animals, likely because increased net energy balance directly increases reproductive hormones and advances breeding. In capital breeders, increased net energy balance increases energy reserves, which eventually leads to improved reproductive readiness and earlier breeding. To test the hypothesis that phenology of income-breeding birds is independent of energy reserves, we conducted an experiment on food-supplemented ("fed") and control female black-legged kittiwakes (Rissa tridactyla). We temporarily increased energy costs (via weight handicap) in a 2 × 2 design (fed/unfed; handicapped/un-handicapped) during the pre-laying period and observed movement via GPS-accelerometry. We measured body mass, baseline hormones (corticosterone; luteinising hormone) before and after handicap manipulation, and conducted a gonadotropin-releasing hormone challenge. Females from all treatment groups foraged in similar areas, implying that individuals could adjust time spent foraging, but had low flexibility to adjust foraging distance. Consistent with the idea that income breeders do not accumulate reserves in response to increased food supply, fed birds remained within an energy ceiling by reducing time foraging instead of increasing energy reserves. Moreover, body mass remained constant until the onset of follicle development 20 days prior to laying regardless of feeding or handicap, implying that females were using a 'lean and fit' approach to body mass rather than accumulating lipid reserves for breeding. Increased food supply advanced endocrine and laying phenology and altered interactions between the hypothalamic-pituitary-adrenal axis and the hypothalamic-pituitary-gonadal axis, but higher energy costs (handicap) had little effect. Consistent with our hypothesis, increased food supply (but not net energy balance) advanced endocrine and laying phenology in income-breeding birds without any impact on energy reserves. Article in Journal/Newspaper rissa tridactyla Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Hormones and Behavior 127 104874 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Testosterone Radioimmunoassay Phenotypic flexibility Nutritional stress HPG axis HPA axis Hidden Markov model Luteinising hormone-releasing hormone GnRH challenge Energy expenditure [SDE]Environmental Sciences |
spellingShingle |
Testosterone Radioimmunoassay Phenotypic flexibility Nutritional stress HPG axis HPA axis Hidden Markov model Luteinising hormone-releasing hormone GnRH challenge Energy expenditure [SDE]Environmental Sciences Whelan, Shannon Hatch, Scott, Benowitz-Fredericks, Z, Parenteau, Charline Chastel, Olivier Elliott, Kyle The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
topic_facet |
Testosterone Radioimmunoassay Phenotypic flexibility Nutritional stress HPG axis HPA axis Hidden Markov model Luteinising hormone-releasing hormone GnRH challenge Energy expenditure [SDE]Environmental Sciences |
description |
International audience Current food supply is a major driver of timing of breeding in income-breeding animals, likely because increased net energy balance directly increases reproductive hormones and advances breeding. In capital breeders, increased net energy balance increases energy reserves, which eventually leads to improved reproductive readiness and earlier breeding. To test the hypothesis that phenology of income-breeding birds is independent of energy reserves, we conducted an experiment on food-supplemented ("fed") and control female black-legged kittiwakes (Rissa tridactyla). We temporarily increased energy costs (via weight handicap) in a 2 × 2 design (fed/unfed; handicapped/un-handicapped) during the pre-laying period and observed movement via GPS-accelerometry. We measured body mass, baseline hormones (corticosterone; luteinising hormone) before and after handicap manipulation, and conducted a gonadotropin-releasing hormone challenge. Females from all treatment groups foraged in similar areas, implying that individuals could adjust time spent foraging, but had low flexibility to adjust foraging distance. Consistent with the idea that income breeders do not accumulate reserves in response to increased food supply, fed birds remained within an energy ceiling by reducing time foraging instead of increasing energy reserves. Moreover, body mass remained constant until the onset of follicle development 20 days prior to laying regardless of feeding or handicap, implying that females were using a 'lean and fit' approach to body mass rather than accumulating lipid reserves for breeding. Increased food supply advanced endocrine and laying phenology and altered interactions between the hypothalamic-pituitary-adrenal axis and the hypothalamic-pituitary-gonadal axis, but higher energy costs (handicap) had little effect. Consistent with our hypothesis, increased food supply (but not net energy balance) advanced endocrine and laying phenology in income-breeding birds without any impact on energy reserves. |
author2 |
McGill University = Université McGill Montréal, Canada Institute for Seabird Research and Conservation Institut for Searbird Research and Conservation Bucknell University Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Whelan, Shannon Hatch, Scott, Benowitz-Fredericks, Z, Parenteau, Charline Chastel, Olivier Elliott, Kyle |
author_facet |
Whelan, Shannon Hatch, Scott, Benowitz-Fredericks, Z, Parenteau, Charline Chastel, Olivier Elliott, Kyle |
author_sort |
Whelan, Shannon |
title |
The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
title_short |
The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
title_full |
The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
title_fullStr |
The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
title_full_unstemmed |
The effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
title_sort |
effects of food supply on reproductive hormones and timing of reproduction in an income-breeding seabird |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03009320 https://doi.org/10.1016/j.yhbeh.2020.104874 |
genre |
rissa tridactyla |
genre_facet |
rissa tridactyla |
op_source |
ISSN: 0018-506X EISSN: 1095-6867 Hormones and Behavior https://hal.archives-ouvertes.fr/hal-03009320 Hormones and Behavior, Elsevier, 2021, 127, pp.104874. ⟨10.1016/j.yhbeh.2020.104874⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.yhbeh.2020.104874 hal-03009320 https://hal.archives-ouvertes.fr/hal-03009320 doi:10.1016/j.yhbeh.2020.104874 |
op_doi |
https://doi.org/10.1016/j.yhbeh.2020.104874 |
container_title |
Hormones and Behavior |
container_volume |
127 |
container_start_page |
104874 |
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1766179170789883904 |