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Summary A study on seed predation by bruchid beetles was carried out to understand the interactions between seed beetles and Acacia seeds in Queen Elizabeth National Park, Uganda. The beetles encountered in seeds were carefully isolated, preserved, labelled and identified. Seed infestation was assessed using cutting tests. Four seed beetles, Enaretha castelnaudi, Tuberculobruchus natalensis and Bruchidius spp. were found in two large seeds of Acacia sieberiana, while Caryedon serratus and Bruchidius submaculatus were found in small seeds of Acacia gerrardii. The small seeded A. gerrardii had a higher rate of infestation than the large seeded A. sieberiana, in spite of the latter species having more seed predators than the former. The intensity of seed predation on A. sieberiana had negligible differences within and between study sites. The intensity of seed predation was only significant with A. gerrardii at Kayampara study site. The possible compensatory response by A. sieberiana to seed predation by beetles is possession of many large seeds with adequate resources to accommodate a guild of seed predators. This study indicated the potential of seed predation as a biological control tool against the spread of A. gerrardii. Résumé On a mené une recherche sur l'infestation de semences par des coéoptères bruchidés pour comprendre les interactions entre les coléoptères et les semences d' Acacia au Parc National Queen Elizabeth, en Ouganda. Les coléoptères trouvés dans les semences ont été soigneusement isolés, conservés, étiquetés et identifiés. On a évalué l'infestation au moyen de tests de recoupement. Quatre coléoptères, Enartha castelnaudi, Tuberculobruchus natalensis et Bruchidius spp. furent trouvés dans les grandes graines d' Acacia sieberiana, tandis que Caryedon serratus et Bruchidius submaculatusétaient trouvés dans les petites graines d' Acacia gerrardii. Acacia gerrardii, qui a de plus petites semences, présentait un plus fort taux d'infestation que Acacia sieberiana qui en a des plus grosses, malgré le fait que ce dernier a de plus nombreux prédateurs que le premier. L'intensité de la prédation des semences d' Acacia sieberiana ne présentait que des différences négligeables entre les sites de recherches. L'intensité de la prédation des semences d' A. gerrardii n'était significative qu'à l'endroit nommé Kayampara. Il est possible que la réponse d' A. sieberianaà la prédation par les coléoptères soit la possession de nombreuses grosses semences disposant des ressources nécessaires pour faire face à des quantités de prédateurs. Cette étude indiquait la possibilité que la prédation au niveau des semences soit un moyen de contrôle biologique contre la dispersion d' A. gerrardii.
African Journal of Ecology – Wiley
Published: Sep 1, 1995
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