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1984
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Y. Gillon et al., « Heteroligus meles billberg (Col., Scarabaeidae), un bon matériel d’étude de l’équateur biologique », Revue d'Écologie (La Terre et La Vie) (documents), ID : 10.3406/revec.1984.5114
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The Yam beetle Heteroligus meles is found in tropical Africa both North and South of the equator, and in savannas (in humid areas along watercourses) as well as in rain-forests. This species is monovoltine in West Africa. Its life-cycle is characterized by two migrating flights : one (the feeding migration) takes place at the beginning of the rains away from the areas where the larvae have developped ; it is effected by imagos of low body weight. The second migration flight (the breeding migration) occurs at the outset of the dry season in a reverse direction and is effected by heavier imagos. At Makokou (Gabon), which is located South of the climatic equator, but North (0.4°N) of the geographic equator, preliminary observations suggest the coexistence of two sympatric populations of yam beetles, one with a boreal life-cycle and the other with an austral life-cycle — as it is the case for the bat Hipposideros caffer.