Cohort Affects Growth of Males but Not Females in Alpine Ibex (Capra ibex ibex)

Journal of Mammalogy - Tập 80 Số 3 - Trang 1021-1027 - 1999
Carole Toïgo1,2, Jean‐Michel Gaillard2, J. Michallet1
1Office National de la Chasse. Centre National d'Etudes et de Recherche Appliquée sur la Faune de Montagne, 8 impasse Champ Fila, 38320 Eybens, France
2Unité Mixte de Rercherche 5558, Biométrie, Génétique, et Biologie des Populations, Université Claude Bernard, Lyonl, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France

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Abstract We studied long-term cohort effects on chest girth and horn length in a recently established population of alpine ibex (Capra ibex ibex). Environmental conditions of the year of birth affected chest girth and first-annual increment of horns of males but did not affect chest girth and horns of females. Females compensated for a slow horn growth during their 1st year of life, whereas males did not. Level of polygyny of the species and environmental conditions experienced by the population could account for the occurrence of long-term cohort effects in male growth and its absence in female growth. Abundance of food resources throughout the study period allowed females to show compensatory growth. However, evolutionary constraints on growth that may exist in males of polygynous species may have prevented males from showing compensatory growth.

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Journal of Mammalogy

Tập 80 Số 3

1021-1027

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