Listar por autor "de la Cruz, Carlos"
Mostrando ítems 1-6 de 6
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How should breeders react when aided by helpers?
Carranza, Juan; Polo, Vicente; Valencia-Ruíz, Juliána
; Mateos, Concha; de la Cruz, Carlos (Elsevier, 2008-01)
In cooperatively breeding systems, breeders may reduce their provisioning to the brood when aided by helpers. However, this is found in only some species, and the reasons for the different reactions of breeders are far ... -
Maternal allocation in eggs when counting on helpers in a cooperatively breeding bird
Valencia-Ruíz, Juliána; Mateos, Concha; de la Cruz, Carlos; Carranza, Juan (Nordic Society Oikos, 2016)
For cooperatively breeding birds, it has been proposed that breeders should reduce their investment in eggs when they count on helpers, because this can be compensated for by helpers provisioning of nestlings. Data from ... -
Parents increase their parental effort when aided by helpers in a cooperatively breeding bird.
Valencia-Ruíz, Juliána; de la Cruz, Carlos; Carranza, Juan; Mateos, Concha (Elsevier, 2006-05)
In cooperatively breeding species, parents may be assisted by other individuals to feed the young. How breeding parents react when they receive help is poorly understood. Evidence suggests that parents usually maintain ... -
Positive Correlation between Helpers at Nest and Nestling Immune Response in a Cooperative Breeding Bird.
Valencia-Ruíz, Juliána; Solís, Elena; Sorci, Gabriele; de la Cruz, Carlos (Springer Nature, 2006)
In cooperatively breeding species, helpers may contribute to the success of the brood by increasing the number of independent offspring, but also, they may affect offspring condition and, hence, their survival and recruitment ... -
Testosterone and helping behavior in the azure-winged magpie (Cyanopica cyanus): natural covariation and an experimental test
de la Cruz, Carlos; Solís, Elena; Valencia-Ruíz, Juliána; Chastel, Olivier; Sorci, Gabriele (Springer, 2003)
In this study, we investigated patterns of natural covariation between testosterone and reproductive status in a cooperatively breeding bird species, the azure- winged magpie (Cyanopica cyanus). To assess the relationship ... -
Winter male plumage coloration correlates with breeding status in a cooperative breeding species
Solís, Elena; Avilés, Jesús M.; de la Cruz, Carlos; Valencia-Ruíz, Juliána; Sorci, Gabriele (Oxford University Press, 2008-03)
The function of colored ornaments is usually related to the signaling of individual quality in intra- and intersexual interactions. In cooperative breeding species, where only a fraction of the male population access the ...