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Mammalia

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Volume 70, Issue 1-2

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Estimation of population density of Eidolon helvum on the island of Príncipe, Gulf of Guinea / Estimation de densité de population de Eidolon helvum sur l'île de Príncipe, Golfe de Guinée

Martin Dallimer
  • Biodiversity and Macroecology Group, Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
 / Tony King
  • Projet Protection des Gorilles, John Aspinall Foundation, BP 13977, Brazzaville, Republic of Congo
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
 / David Cope / Manuel Borge Jiana
| DOI: https://doi.org/10.1515/MAMM.2006.014

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Abstract

Eidolon helvum is a widespread African fruit bat. It is migratory and can form colonies of millions of individuals. On Príncipe, in the Gulf of Guinea, there are seemingly large numbers of E. helvum . Here, they have lost their migratory behaviour and rely on the availability of the year-round food resources on the island, which is small (128 km2) but is dominated by both primary rainforest and fruit-tree plantations. We visited the major roost for E. helvum on the island. Exit counts carried out on two consecutive nights showed the roost was used by between 10,539 (SE±67) and 14,160 (SE±324) individuals. Compared to mainland Africa, the colony was small, no doubt constrained by the size of the island. Nonetheless, Príncipe still supports a considerable density of E. helvum of between 82 and 111 bats/km2, which is comparable with densities found on mainland Africa.

Résumé

Eidolon helvum est un chiroptère phytophile d'Afrique répandu et abondant. Il est migrateur et peut former des colonies de millions d'individus. Sur Príncipe, dans le Golfe de Guinée, il y a apparemment un grand nombre de E. helvum . Ici, ils ont perdu leur comportement migrateur et sont dépendants de la disponibilité des ressources alimentaires au cours de l'année sur l'île, qui est petite (128 km2) mais dominée par la forêt pluviale primaire et des plantations d'arbres fruitiers. Nous avons visité le dortoir principal d' E. helvum sur l'île. Les comptages d'envol effectués durant deux nuits consécutives ont montré qu'il était utilisé par 10.539 (SE±67) à 14.160 (SE±324) individus. Selon les standards d'Afrique continentale, la colonie était petite, sans doute une contrainte due à la taille de l'île. Néanmoins, Príncipe supportait une densité considérable de E. helvum , entre 82 et 111 chiroptères/km2, ce qui est comparable aux densités trouvées en Afrique continentale.

Keywords: Eidolon helvum; exit count; fruit bat; Gulf of Guinea; population density; Príncipe; roost count; chiroptère phytophile; comptage d'envol; comptage au dortoir; densité de population; Eidolon helvum; Golfe de Guinée; Príncipe

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Published in Print: 2006-02-01

Citation Information: Mammalia, Volume 70, Issue 1-2, Pages 48–51, ISSN (Online) 1864-1547, ISSN (Print) 0025-1461, DOI: https://doi.org/10.1515/MAMM.2006.014.

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