Figure 1.
The 15 WWF ecoregions represented in Angola are displayed together with the network of protected areas (see text for details).
Table 1.
Geographical distribution in Angola and in the African continent, main types of ecosystems and global conservation status [45] for each species considered in the present study. Nomenclature according to The Plant List [55].
Figure 2.
Biogeographical patterns of Angolan forest species selected for this study.
a) Dendrogram of a cluster analysis based on the distribution (presence/absence) of timber tree species in each of the ecoregions. Distribution of collection localities of the four species groups identified in this study, in relation to: b) protected areas and the 15 WWF ecoregions represented in Angola; and c) Köppen–Geiger climate classification. Clustering was based on the Jaccard index of similarity and on the Ward agglomeration algorithm.
Figure 3.
Geographic distribution in Africa of representative timber trees from Angola.
(a) Species typical of Guineo-Congolian rainforests that reach their southern limit in Cabinda (E. cylindricum; E. utile; G. arnoldiana; G. balsamiferum; K. ivorensis; O. oxyphyllum; T. superba); and species with >15% of their global range concentrated in Angola, including (b) G. coleosperma, (c) P. angolensis, (d) E. spicatum. Black squares: studied specimens from Angola, housed in LISC, LISU, COI, BM and K; grey circles: data obtained via the GBIF portal.
Table 2.
Number of specimen collection localities and estimates of the global and national (Angola) extent of occurrence (EOO) for the selected timber tree species.
Table 3.
Forest cover (in 2000) and forest cover changes (2000–2012) estimated in 5-km buffers around the herbarium collection localities for each Angolan timber tree species.