Comparison of the Breeding Biology of Sympatric Red-Tailed Hawks, White-Tailed Hawks, and Crested Caracaras in South Texas

摘要: Abstract We compared the breeding biology of sympatric nesting Red-tailed Hawks (Buteo jamaicensis), White-tailed albicaudatus), and Crested Caracaras (Caracara cheriway) in south Texas during 2003 2004. monitored 46 attempts by Hawks, 56 27 Caracaras. Observed success was similar for (62%) (61%), but lower (51%). Daily survival rates (0.99) were same all three species. both fledged 1.13 young per pair 1.39 pair. All species nested earlier 2004 than 2003; addition, overall density these almost doubled from (1.45 pairs/km2) to (2.71 pairs/km2). Estimated productivity within ranges reported other studies. Given extensive progressive habitat alteration some areas s...