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Table 1 Environmental and human disturbance—characterisation of study units

From: Effects of vegetation strata and human disturbance on bird diversity in green areas in a city in southern Chile

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