Organisation at Population Level 27
0
4
8
12
16
Age (months)
60
50
40
30
20
10
Population (%)
Figure 3.1 Age distribution of a population with high natality rate. (From Hadjibiros
2007. Ecology. Ecosystems and Environmental Protection, 3rd edition. Symmetria,
Athens. With permission.)
0
4
8
12
16
20
24
Age (months)
40
30
20
10
Population (%)
Figure 3.2 Age distribution of a stagnant population. (From Hadjibiros 2007. Ecology.
Ecosystems and Environmental Protection, 3rd edition. Symmetria, Athens.
With permission.)
0
25 50 75 100 125 150 175 200 225
Age (years)
60
40
20
Population (%)
Figure 3.3 Age distribution of a tree non-generating population in a mountain forest.
(From Hadjibiros 2007. Ecology. Ecosystems and Environmental Protection, 3rd
edition. Symmetria, Athens. With permission.)