Tropical Forest Community Ecology

Disparity in Tree Species Richness among Biomes 39

y = 0.7592x −2.2175

R^2 = 0.1264

0

1

2

3

4

5

5.5 5.9 6.3 6.7 7.1

Log area (km^2 )

AfTr

AsTr

NeTr

NABo EABo

EuTe

AsTe

SATe

AuTe

NAWTe

NAETe

Log tree species richness

Figure 3.3 Log of extant tree species richness plotted against the log of 11 extant biome areas. AfTr, African
Tropics; AsTr, Asian Tropics; NeTr, Neotropics; SATe, South American Temperate; AuTe, Australian Temperate;
NAWTe, North American Western Temperate; NAETe, North American Eastern Temperate; AsTe, Asian Temperate;
EuTe, European Temperate; NABo, North American Boreal; EABo, Eurasian Boreal.

y = 2.6847x − 4.7262

R^2 = 0.3496

0

1

2

3

4

5

2.1 2.5 2.9 3.3

Log area integrated over time

(a) (b)

(c)

Log current tree diversity

y = 1.9325x − 3.6804

R^2 = 0.5709

0

1

2

3

4

5

2.2 2.6 3.0 3.4 3.8 4.2

Log area integrated over time

Log current tree diversity

y = 1.6148x − 2.8071

R^2 = 0.6119

0

1

2

3

4

5

2.5 2.9 3.3 3.7 4.1 4.5

Log area integrated over time

Log current tree diversity

Figure 3.4 Log current tree diversity plotted against log area integrated over time since (a) the Miocene to present

(11.2 Ma), (b) the Oligocene to present (30 Ma), and (c) the Eocene to present (55 Ma). Each point corresponds to the

amount of ar ea und er th ecurv ein each biom ehistory plot in Figur e3.2. In (a), only th eblack ar eas (from 11.2 Ma

to the present) were included, in (b) the black and dark gray areas (from 30 Ma to the present) were included, and in

(c) the entire area under the curve was included (from 55 Ma to the present).