Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Baobabs, Adansonia spp. (Bombacaceae Malvaceae), around Antsiranana (Diego Suarez), northern Madagascar.

Abstract

Baobabs list eight species of the genus Adansonia L. (Bombacaceae Malvaceae). One species is endemic to mainland Africa, one to Australia and six to Madagascar. Three Malagasy species are classed by IUCN as Lower Risk/Near Threatened and three are Endangered with limited numbers under the criteria of Extent of Occurrence and Area of Occupancy. The Antsiranana (Diego Suarez) region in northern Madagascar is home to A. madagascariensis Baill., A. suarezensis H. Perrier and A. perrieri Capuron. These are threatened by multiple causes. Naturally low regeneration rates, deforestation, use of fuelwood and charcoal, commercial logging, livestock grazing, collection and consumption of fruit, seed collection for use in cosmetics manufacture, and illegal fires are among these threats. Ecological (unable to regenerate in situ) if not physical extinction is possible because of the low regeneration potential. In addition to direct and immediate threats, the species are vulnerable to long term climate change. Small and fragmented populations, human-wildlife conflict, climate change, invasive species, diseases, lack of conservation law enforcement and inadequate knowledge and research make the prognosis for the survival of this part of Madagascar's heritage and biodiversity not very positive.