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Composante sociale des traits d'histoires de vie d'un ongulé forestier européen : cas du sanglier femelle

Abstract : Life-history theory predicts that reproduction is costly. In iteroparous organisms, this cost leads to a trade-off between the reproductive effort at a given time and the future reproduction expectation. The cost of precocious reproduction for yearling female wild boar (Sus scrofa) was assessed using data from a wild population in Champagne, France, collected during 12 years. In the wild boar, a polygynous ungulate species, yearling females can reproduce as early one year of age, and they have generally large litters. We estimated possible costs of early reproduction for those young females using body mass to estimate energy reserves. Precocious breeders were bigger, but after weaning they gained little mass and were leaner than non-breeding females. This difference in body mass disappeared by the following spring. This suggests a trade-off between energy allocated to reproduction and body mass maintenance, but only for a short time. We also checked possible consequences of the short-term cost on subsequent reproduction success. Reproduction at 1-yr of age did not affect the breeding frequency at 2-yr. At the second year of age, litter size at weaning of females, which already reproduced during the previous year, was bigger than the litter size of females, which did not reproduce at 1-yr. However, non-parous females gave birth one month earlier than parous females, and the energetic cost of reproduction may have had consequences for the quality of piglets. Finally at short-term, reproductive investment of precocious wild boars appeared to be of low cost and could even offer benefits in term of reproductive success. However, precocious reproduction entailed social costs that its may compensate the high reproductive success.
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https://tel.archives-ouvertes.fr/tel-00514186
Contributor : Gwenael Kaminski <>
Submitted on : Wednesday, September 1, 2010 - 3:24:55 PM
Last modification on : Saturday, February 15, 2020 - 1:44:53 AM

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  • HAL Id : tel-00514186, version 1

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Gwenaël Kaminski. Composante sociale des traits d'histoires de vie d'un ongulé forestier européen : cas du sanglier femelle. Ecologie, Environnement. Université Paris-Nord - Paris XIII, 2005. Français. ⟨tel-00514186⟩

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