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1 January 2008 Nest-Site Characteristics Affect Daily Nest-Survival Rates of Northern Aplomado Falcons (Falco Femoralis Septentrionalis)
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Abstract

We modeled daily nest-survival rates (DSR) of a reintroduced population of Northern Aplomado Falcons (Falco femoralis septentrionalis; hereafter “falcons”) in southern Texas. Although falcons have nested in the region since 1995, the factors influencing reproductive success are not understood. Nest sites were classified into nest-type groups using a cluster analysis based on nest substrate and nest builder. Using an information-theoretic approach, we compared relative effects of nest age, study area, nest-type group, and physical nest-site characteristics. Our results were similar to previous studies of passerine nesting ecology, in that DSR varied throughout the nesting cycle: it was constant during incubation, declined at hatching and the early nestling phase, and increased through the remainder of the nestling phase. Nest type and nest height were important physical nest-site covariates, overhead cover was less important, and study area and nest initiation date were not influential. We note that although nest success was well correlated with simple nest-site covariates, many falcons chose poor-quality nest sites, which raises the question of whether nest-site selection by falcons is optimal in this region.

Las Características de los Sitios de Nidificación Afectan las Tasas de Supervivencia Diaria de los Nidos de Falco femoralis septentrionalis

Jessi L. Brown and Michael W. Collopy "Nest-Site Characteristics Affect Daily Nest-Survival Rates of Northern Aplomado Falcons (Falco Femoralis Septentrionalis)," The Auk 125(1), 105-112, (1 January 2008). https://doi.org/10.1525/auk.2008.125.1.105
Received: 14 September 2006; Accepted: 1 March 2007; Published: 1 January 2008
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