Plant species richness in the Cape Verde archipelago is examined relative to
island eco-geographical factors. Species-area and species-area-habitat relationships are
analysed using the classical species-area model and the recently proposed species-choros
model. The number of Xoristic zones (used to estimate the choros parameter) provides an
adequate estimate of the potential habitat diversity, and the species-choros model achieved a
better Wt with both total Xora and endemic species. In addition to area and habitat diversity,
longitude also emerges as an important determinant of species diversity, whereas latitude,
minimum distance to the nearest island, and total rural population do not display any correlation.
As in other insular ecosystems, the species richness (about 140 per 100 km2
) is lower
than in nearby mainland regions; the proximity to the desert areas of the Sahel can also be
seen as related with this low value. The Xoristic heterogeneity in Cape Verde is high, as is
usual in island ecosystems. In a comparative analysis of the species richness on the diVerent
islands (using -values), Brava stands out as having the highest total Xora species densities,
while for endemic Xora Brava and São Nicolau jointly occupy the leading position. The
high diversity for both total and endemic species on Santo Antão, São Vicente, São Nicolau,
Fogo and Brava reinforces their importance in conservation terms - in the case of most of
them, something that is already recognized in the established network of protected areas.