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A sharp floristic discontinuity revealed by the biogeographic regionalization of African savannas [presence data]
Fayolle, Adeline mailto [Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels >]
[en] Biogeography ; tropical Africa ; Savanna
[en] Aim. In tropical Africa, savannas cover huge areas, have high plant species richness, and are considered as a major natural resource for most countries. There is, however, little information available on their floristics and biogeography at the continental scale, despite the importance of such information for our understanding of the drivers of species diversity at various scales and for effective conservation and management. Here, we collated and analysed floristic data from across the continent in order to propose a biogeographic regionalization for African savannas.

Location. We collated floristic information (specifically woody species lists) for 298 samples of savanna vegetation across Africa, extending from 18°N to 33°S and from 17°W to 48°E.

Taxon. We focused on native woody species.

Methods. We used ordination and clustering to identify the floristic discontinuities and gradual transitions across African savannas. Floristic relationships, specificity and turnover, within and between floristic clusters, were analysed using a (dis-)similarity-based approach.

Results. We identified eight floristic clusters across African savannas which in turn were grouped into two larger macro-units. Ordinations at species and genus levels showed a clear differentiation in woody species composition between the North/West macro-unit and the South/East macro-unit. This floristic discontinuity matches to the High (i.e., N&W) and Low (S&E) division of Africa previously proposed by White (1983) and which tracks climatic and topographic variation. In the N&W savannas, the floristic gradient determined by rainfall was partitioned into the Sudanian (drier) and Guinean (wetter) clusters. Within the highly heterogeneous S&E savannas and woodlands, six clusters were identified: Ugandan, Ethiopian, Mozambican, Zambezian, Namibian and South-African.

Main conclusions. The proposed pan-African classification of savannas and woodlands might assist the development of coordinated management and conservation policies.
see the Acknowlegments section of the original paper
Presence data of woody species across African savanna sites analysed in the paper entitled 'A sharp floristic discontinuity revealed by the biogeographic regionalization of African savannas' published in Journal of Biogeography by Adeline Fayolle, Michael D. Swaine, Julie Aleman, Akomian F. Azihou, David Bauman, Mariska te Beest, Emmanuel N. Chidumayo, Joris P.G.M. Cromsigt, Hélène Dessard, Manfred Finckh, Francisco Maiato P. Gonçalves, Jean-Francois Gillet, Anais Gorel, Aurélie Hick, Ricardo Holdo, Ben Kirunda, Gregory Mahy, Iain McNicol, Casey M Ryan, Rasmus Revermann, Andrew Plumptre, Rose Pritchard, Paula Nieto-Quintano, Christine B. Schmitt, Josiane Seghieri, Tony Swemmer, Habte Talila and Emily Woollen.

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