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Table 1 Mean ordinary abundance (ind./transect) and mean standardized abundance (individuals · [10 km 2]1 · h 1) of raptors

From: Raptor assemblages in grasslands of Southern Brazil: species richness and abundance and the influence of the survey method

Species Roadside point transect Roadside strip transect Ordinary abundance
Ordinary abundance Standardized abundance Ordinary abundance Standardized abundance Coastal plain Altitudinal grasslands
Cathartidae 77 ± 51.01 4.90 ± 3.04 35 ± 25.11 1.41 ± 0.96 25.13 ± 19.87 173.75 ± 41.07
Turkey Vulture (Cathartes aura) 8.38 ± 8.48 0.53 ± 0.51 3.50 ± 4.87 0.14 ± 0.18 0.75 ± 2.12 22.25 ± 6.58
Lesser Yellow-headed Vulture (Cathartes burrovianus) 0.13 ± 0.35 < 0.01 ± 0.02 - - 0.13 ± 0.35 -
Black Vulture (Coragyps atratus) 68.38 ± 45.12 4.35 ± 2.67 31.50 ± 23.11 1.27 ± 0.88 24.25 ± 18.67 151.25 ± 38.60
King Vulture (Sarcoramphus papa) 0.13 ± 0.35 < 0.01 ± 0.02 - - - 0.25 ± 0.35
Accipitridae 23.00 ± 24.15 1.46 ± 1.44 15.13 ± 10.37 0.61 ± 0.36 29 ± 21.57 18.25 ± 5.96
Snail Kite (Rostrhamus sociabilis) 6.38 ± 11.81 0.41 ± 0.70 3.00 ± 6.7 0.11 ± 0.22 9.38 ± 11.85 -
Long-winged Harrier (Circus buffoni) 0.88 ± 1.13 0.06 ± 0.07 0.75 ± 0,71 0.03 ± 0.03 1.38 ± 0.92 0.50 ± 0.46
Savanna Hawk (Buteogallus meridionalis) 7.75 ± 8.17 0.49 ± 0.49 4.38 ± 3.11 0.18 ± 0.13 9.75 ± 7.00 4.75 ± 1.69
Great Black Hawk (Buteogallus urubitinga) 0.38 ± 1.06 0.02 ± 0.06 0.25 ± 0.46 0.01 ± 0.02 0.38 ± 1.06 0.50 ± 0.46
Crowned Eagle (Buteogallus coronatus) 0.13 ± 0.35 < 0.01 ± 0.02 - - - 0.25 ± 0.35
Roadside Hawk (Rupornis magnirostris) 5.88 ± 5.38 0.37 ± 0.31 6.50 ± 5.13 0.27 ± 0.20 8.00 ± 5.86 8.75 ± 3.70
White-tailed Hawk (Geranoaetus albicaudatus) 0.75 ± 1.75 0.01 ± 0.10 0.13 ± 0.35 < 0.01 ± 0.01 0.13 ± 0.35 1.50 ± 1.75
Black-chested Buzzard-eagle (Geranoaetus melanoleucus) 0.88 ± 1.75 0.06 ± 0.09 - - - 1.75 ± 1.45
Short-tailed Hawk (Buteo brachyurus) - - 0.13 ± 0.35 < 0.01 ± 0.01 - 0.25 ± 0.35
Falconidae 47.38 ± 14.59 3.02 ± 0.87 37.13 ± 16.23 1.47 ± 0.53 32.38 ± 9.62 104 ± 14.86
Southern Caracara (Caracara plancus) 17.63 ± 8.00 1.12 ± 0.48 13.00 ± 2.98 0.53 ± 0.13 16.88 ± 7.47 27.5 ± 4.86
Yellow-headed Caracara (Milvago chimachima) 3.13 ± 3.36 0.20 ± 0.20 4.50 ± 5.48 0.17 ± 0.19 1.25 ± 0.71 12.75 ± 5.18
Chimango Caracara (Milvago chimango) 15.38 ± 11.78 0.98 ± 0.70 5.75 ± 6.32 0.22 ± 0.23 4.75 ± 3.85 32.75 ± 11.82
American Kestrel (Falco sparverius) 10.88 ± 4.82 0.69 ± 0.29 13.88 ± 9.52 0.54 ± 0.22 9.38 ± 4.07 30.75 ± 9.05
Aplomado Falcon (Falco femoralis) 0.38 ± 0.74 0.02 ± 0.04 - - 0.13 ± 0.35 0.50 ± 0.71
Not identified to species - - 1.63 ± 2.07 0.06 ± 0.08 0.13 ± 0.35 3.00 ± 2.13
Total 147.38 ± 60.97 9.38 ± 3.63 88.88 ± 30.50 3.55 ± 1.08 86.63 ± 44.04 299.25 ± 48.91
  1. They were surveyed using roadside point transects and roadside strip transects along four routes in two regions of southern Brazil in 2009 and 2010. Taxonomy follows Remsen et al. (2012).