Isolation and Decline of a Population of the Orange-Breasted Falcon

The condor

Robert B. Berry¹ 

关键词: Belize;    declining populations;    Falco deiroleucus;    Guatemala;    raptor management;    small populations;   

DOI  :  10.1525/cond.2010.100012

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. Probably always rare and local because of its ecology and specialized habitat, the small, isolated population of the Orange-breasted Falcon (Falco deiroleucus) in Belize and Guatemala, likely numbering fewer than 40 territorial pairs, appears to be in steep decline in Belize. Territory occupancy (n = 12 eyries) in the population we studied in Belize declined from 83% (1992 to 1997) to 54% (2003 to 2009), and occupancy in 2009 was only half the mean in the prior decade. Mean annual production of fledglings per territorial pair declined 35% from 0.77 to 0.50. Mean annual population productivity, which measures the combined effect of occupancy and fecundity, declined 57% from 0.90 to 0.38. In contrast, neither occupancy nor fledging success in Guatemala (n = 7 eyries) declined over the same time period. Historical records and recent surveys suggest that the Orange-breasted Falcon has been extirpated from much of Central America and southern Mexico and that its range is contracting in South America,...

【 授权许可】

CC BY