L'«Opération éléphants» au Rwanda. I. Structure de la population du Bugesera et transfert de jeunes au parc de l'Akagera
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1977
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Populations, Human Human populations Population growth Human population Demography DemographicsCiter ce document
Alain Monfort et al., « L'«Opération éléphants» au Rwanda. I. Structure de la population du Bugesera et transfert de jeunes au parc de l'Akagera », Revue d'Écologie (La Terre et La Vie) (documents), ID : 10.3406/revec.1977.4973
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During an elephant eradication scheme in Rwanda, 134 individuals were shot or captured and data collected on their population structure. The overall sex-ratio was 65 males : 69 females, males being more numerous in the younger age group and females in the older. Pregnant and lactating females were always 15 years old at least. Mean calving interval was 5.1 years. The percentage of young of the year was 5.2 %. Population density ranged between 1.9. and 2.4/km2 and standing crop biomass between 3.2 and 4.6 metric tons per square kilometer. There were however significant differences between the two groups of 69 individuals living in the Karama and Rwinzoka areas respectively. The Karama population living in wooded grassland (34 km²), was younger (43.2 % of adult individuals) than the Rwinzoka population confined to 27 km² of swamps (53.7 % of adult individuals). The mean calving interval was 3.5 years in the first population and 7,fi years in the second. Twenty six young elephants were successfully translocated to the Akagera National Park, where the species had become extinct in 1938.