Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals
In polygynous species, most dominant males sire a disproportionate number of offspring and dominance rank is assumed to be age dependent. Yet, extreme inter-male competition and high early male mortality prevent most males from reaching a social status that could guaranty a high reproductive success...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/185833 2023-12-17T10:29:40+01:00 Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals ALLEGUE, Hassen GUINET, Christophe PATRICK, Samantha RIBOUT, Cécile BICHET, Coraline LEPAIS, Olivier RÉALE, Denis 2022-12-09 https://oskar-bordeaux.fr/handle/20.500.12278/185833 https://hdl.handle.net/20.500.12278/185833 https://doi.org/10.32942/X21S30 en eng https://oskar-bordeaux.fr/handle/20.500.12278/185833 doi:10.32942/X21S30 Offspring sex ratio polygyny reproductive success Mirounga leonina Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE] Document de travail - Pré-publication 2022 ftoskarbordeaux https://doi.org/20.500.12278/18583310.32942/X21S30 2023-11-21T23:32:55Z In polygynous species, most dominant males sire a disproportionate number of offspring and dominance rank is assumed to be age dependent. Yet, extreme inter-male competition and high early male mortality prevent most males from reaching a social status that could guaranty a high reproductive success. Alternative reproductive tactics may have evolved to maximize male reproductive success despite a low social rank. One of them, offspring sex-ratio adjustment, may allow males to produce more offspring of the sex that will provide a higher fitness. If traits influencing dominance in males are heritable and if the average fitness of subordinate males is lower than the average fitness of females, we predict that the probability of producing a son would increase with a male reproductive success as its sons would be more likely to become dominant. We tested this hypothesis on southern elephant seals breeding on the Kerguelen Archipelago. Using 530 pups sired by 52 males, we found that the probability of siring a son increases with a male reproductive success. Out finding provide new insights on sex ratio variation can be an important tool in managing population dynamics and structure, which has direct implications on wildlife conservation. Other/Unknown Material Elephant Seals Mirounga leonina Southern Elephant Seals OSKAR Bordeaux (Open Science Knowledge ARchive) Kerguelen |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Offspring sex ratio polygyny reproductive success Mirounga leonina Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE] |
spellingShingle |
Offspring sex ratio polygyny reproductive success Mirounga leonina Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE] ALLEGUE, Hassen GUINET, Christophe PATRICK, Samantha RIBOUT, Cécile BICHET, Coraline LEPAIS, Olivier RÉALE, Denis Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
topic_facet |
Offspring sex ratio polygyny reproductive success Mirounga leonina Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE] |
description |
In polygynous species, most dominant males sire a disproportionate number of offspring and dominance rank is assumed to be age dependent. Yet, extreme inter-male competition and high early male mortality prevent most males from reaching a social status that could guaranty a high reproductive success. Alternative reproductive tactics may have evolved to maximize male reproductive success despite a low social rank. One of them, offspring sex-ratio adjustment, may allow males to produce more offspring of the sex that will provide a higher fitness. If traits influencing dominance in males are heritable and if the average fitness of subordinate males is lower than the average fitness of females, we predict that the probability of producing a son would increase with a male reproductive success as its sons would be more likely to become dominant. We tested this hypothesis on southern elephant seals breeding on the Kerguelen Archipelago. Using 530 pups sired by 52 males, we found that the probability of siring a son increases with a male reproductive success. Out finding provide new insights on sex ratio variation can be an important tool in managing population dynamics and structure, which has direct implications on wildlife conservation. |
format |
Other/Unknown Material |
author |
ALLEGUE, Hassen GUINET, Christophe PATRICK, Samantha RIBOUT, Cécile BICHET, Coraline LEPAIS, Olivier RÉALE, Denis |
author_facet |
ALLEGUE, Hassen GUINET, Christophe PATRICK, Samantha RIBOUT, Cécile BICHET, Coraline LEPAIS, Olivier RÉALE, Denis |
author_sort |
ALLEGUE, Hassen |
title |
Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
title_short |
Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
title_full |
Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
title_fullStr |
Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
title_full_unstemmed |
Offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
title_sort |
offspring sex ratio increases with male reproductive success in the polygynous southern elephant seals |
publishDate |
2022 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/185833 https://hdl.handle.net/20.500.12278/185833 https://doi.org/10.32942/X21S30 |
geographic |
Kerguelen |
geographic_facet |
Kerguelen |
genre |
Elephant Seals Mirounga leonina Southern Elephant Seals |
genre_facet |
Elephant Seals Mirounga leonina Southern Elephant Seals |
op_relation |
https://oskar-bordeaux.fr/handle/20.500.12278/185833 doi:10.32942/X21S30 |
op_doi |
https://doi.org/20.500.12278/18583310.32942/X21S30 |
_version_ |
1785582123780931584 |