Table 1 Environmental and human disturbance—characterisation of study units
Type of green area | Park | Square | Median strips of main streets | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Los Pinos | Campus Norte | Becker | Godoy | Dreves | Recabarren | Pinto | Schmidt | Prieto Norte | Balmaceda | |
Surface area (ha) | 9.5 | 12 | 17.4 | 0.9 | 1.1 | 1.0 | 1.1 | 0.9 | 2.0 | 3.7 |
Number of strata | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
Richness of bird species | 19 | 30 | 23 | 9 | 14 | 11 | 4 | 10 | 15 | 13 |
Herbaceous stratum | ||||||||||
Cover (%) | 40 | 50 | 35 | 5 | 5 | 30 | 5 | 5 | 15 | 0 |
Shrub stratum | ||||||||||
Cover (%) | 0 | 10 | 5 | 5 | 0 | 5 | 15 | 5 | 5 | 5 |
Richness of species (S) | 0 | 12 | 7 | 14 | 1 | 9 | 37 | 28 | 7 | 4 |
Native species (%) | 0 | 58.3 | 14.3 | 14.3 | 0 | 0 | 8.1 | 10.7 | 0 | 0 |
Tree stratum | ||||||||||
Cover (%) | 60 | 40 | 50 | 40 | 40 | 50 | 40 | 40 | 30 | 30 |
Richness of species (S) | 1 | 23 | 34 | 10 | 16 | 7 | 9 | 15 | 15 | 14 |
Native species (%) | 0 | 82.6 | 29.4 | 20.0 | 25.0 | 42.8 | 66.6 | 26.6 | 20.0 | 28.5 |
Human disturbances | ||||||||||
Bare soil (%) | 0 | 0 | 10.0 | 50.0 | 55.0 | 15.0 | 40.0 | 50.0 | 50.0 | 45.0 |
Vehicle flow (annual average) (No. vehicles/min) | 0 | 0 | 0 | 42 | 27 | 32 | 66 | 76 | 223 | 564 |