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Ostrich
Journal of African Ornithology
Volume 71, 2000 - Issue 1-2
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SYMPOSIUM: BIRDS OF THE CIRCUM-AFRICAN ISLANDS CHAIR: MICHEL LOUETTE

A description of a new species of Brachypteracias (Family Brachypteraciidae) from the Holocene of Madagascar

Pages 318-322 | Published online: 19 Oct 2010
 

Abstract

Goodman, S.M. 2000. A description of a new species of Brachypteracias (Family Brachypteraciidae) from the Holocene of Madagascar. Ostrich 71 (1 & 2): 318–322.

A single humerus of a ground-roller (Brachypteracias, Family Brachypteraciidae), a family endemic to Madagascar, found at a subfossil site in the southwest (Ampoza) of presumed Holocene age and outside the modem geographic range of this genus, is described as a new species. Currently, the region around Ampoza is dry deciduous forest and does not contain any species of ground-roller. On the basis of the habitat preferences of the two extant species of Brachypteracias, both occurring in humid forests, as well as other subfossils recovered at Ampoza, it is concluded that the region was once more mesic. The commencement of this period of desiccation in southwestern Madagascar and associated ecological change occurred before human colonization of Madagascar some 2 000 years ago.

Une nouvelle espéce de rollier terrestre (Brachypteracias) appartenant à la famille endémique de Madagascar des Brachypteraciidae, est décrité à partir d'un seul humérus excavé du site subfossile de l'Holène d'Ampoza localise au sud-ouest. Ce site est localise en dehors de I'aire de distribution actuelle de ce genre. De nos jours, la region au sein de laquelle se trouve le site d'Ampoza est couverte de foret seche caducifolike et n'abrite aucune espéce de rollier terrestre. Sur la base de la connaissance des affinites pour I'habitat des dew espéces du genre Brachypteracias encore vivantes, toutes dew inféodées à la foret humide sempervirente, et prenant en considbation les autres espkces subfosilles retrouvees au niveau du site d'Ampoza, conclusion est faite que cette region a longtemps bkneficie d'un climat humide. L'asséchement de la partie sud-ouest de Madagascar et les changements climatiques qui en ont découlés est sans doute intervenu avant I'anivée de I'homme il y a environ 2 000 ans.

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