Hotspots of plant diversity in Upper Guinean forests

Plant diversity hotspots are based on the distribution of a selection of rare and endemic plant species in Upper Guinean forests. The selection and the methods are treated extensively in chapter 6 (Wieringa & Poorter). The three maps here are the full colour versions of Figure 6.7. Dots are the middle of half-degree cells. For cells that partly cover the sea, the midpoint is positioned on the land surface. The sizes of the symbols are scaled to its biodiversity value. Cells with open symbols have less than eight collections. Cells for which curve fitting was impossible (N = Sobs, see chapter 6) or that were considered to be too unreliable to use (N / Sobs < 1.1 see Box 6.1) were not included in the interpolation analysis, and are indicated by a cross. The background colour indicates the interpolated values for the whole potential forest zone of Upper Guinea: the darker the colour, the higher the biodiversity value.

A S50

0 -10- H - 1 U o tj ¡t-f g 0 " d- d- n o o ■ - o g g d n

0 - 15 15 - 30 30 - 35 35 - 37.5 37.5 - 40 40 - 42.5 42.5 - 45 No data

B Smax

X

N/S

< 1.1

■ J,

o

0 - 50

j a

50 -

100

H m u

O

100

- 150

G * «

O

150

- 200

■ » "4 # H

a t

O

200

- 250

Jf u J □

n *

- 350

o

350

- 400

o

400

- 470

0 - 50 50 - 100 100 - 150 150 - 200 200 - 250 250 - 300 300 - 350 No data

C Srw

4 - 5 O 5 - 6 □ 6 - 7 O 7 - 8 O 8 - 9 O 9 - 10 O 10 - 11,5

Figure A shows the number of species (S) at 50 collections, B shows the maximum estimated number of rare and endemic species (Smax), and Cgives the rarity-weighted species richness (Srw).

Freetown

Freetown

Appendix 5

Monrovia

Buchanan a Mountains

Altitude I 0-100 □ 100-200 200 - 500 500- 1000 1000- 1500 1500-2000 2000 - 3000

Appendix 5

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