No Extra-Pair Fertilization in Flammulated Owls Despite Aggregated Nesting

Author:

Arsenault David P.1,Stacey Peter B.2,Hoelzer Guy A.3

Affiliation:

1. Department of Environmental and Resource Sciences, University of Nevada, Reno, NV 89557

2. Department of Biology, University of New Mexico, Albuquerque, NM 87131

3. Department of Biology, University of Nevada, Reno, NV 89557

Abstract

Abstract We used DNA fingerprinting to estimate the frequency of extra-pair fertilization in the Flammulated Owl (Otus flammeolus), a socially monogamous species often found nesting in aggregations. We observed owls on 44 territories, 42 of which were located in aggregations of 3 to 10 territories with a mean nearest-neighbor distance of 539 m (± 160 m). We sampled a subset of these nests and compared band sharing and numbers of novel fragments among 17 social pairs and 37 offspring. Like other socially monogamous raptors, the Flammulated Owls we studied were genetically monogamous despite their relatively high breeding density. We suggest that the necessity of male parental care may be an important factor contributing to genetic monogamy in this species. Ausencia de Fertilización Extra-Pareja en Otus flammeolus a pesar de Nidificación Agregada Resumen. Usamos huellas dactilares genéticas (i.e., DNA fingerprinting) para estimar la frecuencia de fertilización extra-pareja en Otus flammeolus, una especie social monógama frecuentemente hallada nidificando en agregaciones. Observamos lechuzas en 44 territorios, 42 de los cuales se encontraron en agregaciones de entre 3 a 10 territorios, con una distancia media al territorio vecino más cercano de 539 m (± 160 m). Muestreamos un subconjunto de los nidos localizados y comparamos las bandas compartidas y el número de fragmentos nuevos entre 17 pares sociales y 37 hijos. Al igual que otras rapaces sociales monógamas, los individuos de O. flammeolus que estudiamos fueron genéticamente monógamos, a pesar de la relativamente alta densidad de individuos presentes en la época de cría. Sugerimos que la necesidad de cuidado parental masculino puede ser un factor importante que contribuye a la monogamia genética en esta especie.

Publisher

Oxford University Press (OUP)

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

Reference33 articles.

1. The ecology of Flammulated Owls: nest-site preferences, spatial structure and mating system.;Arsenault,1999

2. Single-locus and multilocus DNA fingerprinting, p. 225–269.;Bruford,1992

3. Battles of the sexes and origins of monogamy, p. 21–52.;Gowaty,1996

4. Behavioral, demographic, and environmental correlates of extra-pair fertilizations in Eastern Bluebirds, Sialia sialis.;Gowaty;Behavioral Ecology,1991

5. Behavioural correlates of uncertain parentage: mate guarding and nest guarding by Eastern Bluebirds, Sialia sialis.;Gowaty;Animal Behaviour,1989

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