Table 5 Correlation of A4 background and MPL with different ecological and historical variables in sub-Saharan Africa

Radiation

UV index

0.737***

0.760***

Insolation incident

−0.157*

−0.005

Diffuse radiation

0.411**

0.300

Direct normal radiation

−0.319*

−0.186

Latitude tilt radiation

−0.279*

−0.136

Clear sky radiation

0.324*

0.389*

Temperature

Average temperature

−0.596***

−0.495**

Average minimum temperature

−0.485**

−0.413*

Average maximum temperature

−0.640***

−0.532**

Earth temperature

−0.665***

−0.501**

Humidity

Relative humidity

0.414**

0.256

Atmospheric pressure

−0.658***

−0.607**

Wind

Wind speed

−0.305*

−0.227

Soil

Sand

−0.612***

−0.520**

Silt

0.714***

0.652**

Clay

0.178*

0.113

Genetic structure

PC1

0.465**

0.491**

PC2

−0.323*

−0.376*