Nebraska Cooperative Fish & Wildlife Research Unit
Date of this Version
5-2020
Citation
Rosenfield, R. N., Sonsthagen, S., Riddle-Berntsen, A. E., Kuhel, E. (2021). Record fledging count from a seven-egg clutch in the Cooper’s hawk (Accipiter cooperii). The Wilson Journal of Ornithology, 132, 460-463.
Abstract
Cooper’s Hawks (Accipiter cooperii) typically lay 3–5 eggs per clutch, rarely 6 eggs, and there are 2 accounts of 7-egg clutches and 1 record of a maximum 8-egg clutch for the species. Brood sizes of 3–5 young are common and the previous maximum brood count is 6 young. However, in 2019, we found an urban nest in Stevens Point, Wisconsin, with 7 eggs that resulted in a record high of 7 fledglings. We genetically confirmed that the attending male sired all the offspring and the attending female laid all 7 eggs. Larger body size of the tending adults may have been a factor in the exceptional reproduction reported here.
El gavila´n Accipiter cooperii t´ıpicamente pone 3–5 huevos por puesta, rara vez 6. Hay 2 reportes de puestas de 7 huevos y 1 registro ma´ximo de una puesta de 8 huevos para esta especie. Los tama˜nos de nidada de 3–5 polluelos son comunes y la nidada ma´xima es de 6 polluelos. Sin embargo, en 2019 encontramos un nido urbano en Stevens Point, Wisconsin, con 7 huevos que result ´o en un r´ecord ma´ximo de 7 polluelos emancipados. Confirmamos gen´eticamente que el macho que los cuidaba era el padre de todos los polluelos y que la hembra que los cuidaba puso los 7 huevos. El tama˜no corporal de los adultos a cargo podr´ıa ser un factor en el evento de reproducci´on extraordinario que reportamos aqu´ı.
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Comments
U.S. government work