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• W2073155682 abstract "Re-introduced African elephant (Loxodonta africana Blumenbach) populations are growing at very high rates in many of southern Africa’s reserves, have attained densities higher than previously thought possible and may be exhibiting irruptive growth. Active management of such populations is necessary to prevent the potentially negative effects on habitat and biodiversity that are associated with elephant overpopulation. One potentially feasible method of elephant management is immunocontraception, but very little is known about the long-term effectiveness of this method. Using demographic data from three South African elephant populations, we made model projections of the effects of contraception on population growth rates to determine whether contraception may be a feasible management tool for elephant. In comparison with noncontracepted populations, realistic reductions in population growth rate after 20 years of contraception were projected to be up to c. 64%, with 50% being a very feasible target. Through its ability to reduce population growth rates, immunocontraception should be an effective tool for preventing or minimizing irruption in elephants and, perhaps, other introduced ungulate species. Le taux de croissance des populations réintroduites d’éléphants d’Afrique (Loxodonta africana Blumenbach) est très élevé dans les réserves d’Afrique australe; elles ont atteint des densités plus élevées qu’on ne l’avait cru possible et elles pourraient présenter une croissance irruptive. La gestion active de telles populations est nécessaire pour empêcher les effets potentiellement négatifs liés à une surpopulation d’éléphants. Une méthode éventuellement possible pour la gestion des éléphants est l’immuno-contraception, mais on sait très peu de choses sur l’efficacitéà long terme de cette méthode. En utilisant les données démographiques portant sur trois populations d’éléphants d’Afrique du Sud, nous avons modélisé des projections des effets de la contraception sur le taux de croissance des populations pour déterminer si la contraception peut constituer un outil de gestion envisageable pour les éléphants. En comparaison avec les populations sans contraception, des projections réalistes de la réduction du taux de croissance de populations après 20 ans de contraception se chiffraient à environ 64%–50% représentant un objectif tout à fait réaliste. Par sa capacité de réduire le taux de croissance de la population, l’immuno-contraception devrait être un outil efficace pour empêcher ou pour réduire au minimum l’irruption des éléphants et, peut-être, celle d’autres espèces ongulés introduits. Figure S1. Flow chart depictingthe states and the possible transitions between states in the age- andstate-structured elephant population model. Probabilities associated with eachtransition are shown, and are presented in the order of events in the model. Probabilities in modeled sequence are: ρ – probability of being born female; α – survival to next age group; β – sexual maturation and η – menopause; δ – contraception; and γ – conception. Table S1. Description andvalues of parameters used in the elephant population model. Please note: As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer-reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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• W2073155682 date "2009-12-01" @default.
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• W2073155682 title "Modelling the effectiveness of contraception for controlling introduced populations of elephant in South Africa" @default.
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• W2073155682 doi "https://doi.org/10.1111/j.1365-2028.2009.01075.x" @default.
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