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Journal of Field Ornithology
Article . 2017 . Peer-reviewed
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Do extended incubation recesses carry fitness costs in two cavity-nesting birds?

Authors: Bueno-Enciso, Javier; Barrientos, Rafael; Ferrer, Esperanza S.; Sanz, Juan José;

Do extended incubation recesses carry fitness costs in two cavity-nesting birds?

Abstract

[ES] Debido a que los periodos extendidos o prolongados de receso durante los cuales el ave que incuba se ausenta del nido por un periodo más largo de lo usual son poco frecuentes, éstos han sido tratados como atípicos o han sido ignorados. Sin embargo, la temperatura de los huevos puede disminuir muy por debajo de la temperatura cero fisiológica durante estos periodos prolongados de recesos, lo que potencialmente puede afectar el desarrollo embrionario. Por tal motivo, es importante evaluar los periodos extensivos de receso en un contexto ecológico e identificar su posible efecto en la aptitud. Con este objetivo, utilizamos data-loggers iButton para monitorear la conducta de incubación de hembras de Cyanistes caeruleus y Parus major durante dos épocas reproductivas en España central. Clasificamos como recesos extendidos en la incubación, si estos eran cuatro veces mayores que el periodo promedio de recesos en cada especie. Los periodos extensivos de receso ocurrieron con mayor frecuencia en el 2012, cuando las hembras mostraron una peor condición corporal. Las hembras de Cyanistes caeruleus tuvieron periodos de receso en la incubación más extendidos que las hembras de Parus major y en ambas especies los periodos de receso extendido ocurrieron al principio de la temporada de reproducción. Tanto el periodo de atención del nido como el promedio mínimo de la temperatura dentro del nido disminuyó cuando se presentó por lo menos un periodo extendido de receso. El periodo de incubación fue, en promedio, cuatro días más largo en nidos en los que las hembras tuvieron por lo menos un receso extendido, incrementando potencialmente el riesgo de depredación y resultando en una calidad más baja de los polluelos. En general, nuestros resultados sugieren que los periodos extendidos de receso, pueden ser más comunes en aves cantoras que lo que se pensaba con anterioridad, y que, dado su efecto en la temperatura de los huevos y atención del nido, pudiera acarrear costos asociados con la aptitud reproductiva.

[EN] Because extended incubation recesses, where incubating songbirds are away from nests for periods much longer than usual, occur infrequently, they have been treated as outliers in most previous studies and thus overlooked. However, egg temperatures can potentially fall below the physiological zero temperature during extended recesses, potentially affecting developing embryos. As such, evaluating extended recesses in an ecological context and identifying their possible fitness effects are important. With this aim, we used iButton data loggers to monitor the incubation behavior of female Blue Tits (Cyanistes caeruleus) and Great Tits (Parus major) during two breeding seasons in central Spain. We classified incubation recesses as extended if they were more than four times the mean recess duration for each species. Extended incubation recesses occurred more frequently in 2012 when females exhibited poorer body condition. Female Blue Tits had more extended incubation recesses than female Great Tits and, for both species, more extended recesses occurred at the beginning of the breeding season. Both nest attentiveness and average minimum nest temperature decreased when at least one extended recess occurred. Incubation periods averaged 4 d longer for nests where females had at least one extended recess, potentially increasing predation risk and resulting in lower-quality nestlings. Overall, our results suggest that extended recesses may be more common among songbirds than previously thought and that, due to their effects on egg temperatures and attentiveness, they could impose fitness costs.

Funding was provided by MINECO (CGL2013-48001-C2-1-P, CGL2010-21933-C02-01) and the Junta de Comunidades de Castilla-La Mancha and the European Social Fund (POIC10-0269-7632).

Peer reviewed

Country
Portugal
Keywords

Energy constraints, Temperatures, energy constraints, iButton, temperature, embryo development, Trade-off, Embryo development, trade-off

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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