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Article
Eva Serrano-Davies, Auteur ; Rafael Barrientos, Auteur ; Juan Jose Sanz, AuteurThe use of nest- boxes to study bird breeding biology, as well their use as a management tool, is widespread. The exact placement of nest-boxes may affect individual preference for these breeding sites; however the influence of determinant facto[...]
Article
Vicente Garcia-Navas, Auteur ; Esperanza S. Ferrer, Auteur ; Juan Jose Sanz, AuteurCapsule The effect of nestling age (7, 10 and 13 days old) on prey choice by Blue Tits Cyanistes caeruleus seems to be related to time constraints on food selectivity rather than chick gape-size limitations. Aims To study age differences in the [...]
Article
Vicente Garcia-Navas, Auteur ; Juan Jose Sanz, Auteur ; Santiago Merino, Auteur ; Josue Martinez-De La Puente, Auteur ; Elisa Lobato, Auteur ; Sara del Cerro, Auteur ; Juan Rivero, Auteur ; Rafael Ruiz de Castaneda, Auteur ; Juan Moreno, AuteurPrevious studies have found strong relationships between calcium availability and eggshell pigmentation in the Great Tit (Parus major). According to the "structural function hypothesis", protoporphyrins, the pigments responsible for reddish spot[...]
Article
Vicente Garcia-Navas, Auteur ; Juan Jose Sanz, AuteurA common feature of many birds breeding in seasonal environments is that fitness-related parameters such as nestling mass or survival decline as the breeding season progresses. Consequently, there is a tendency for early breeders to have better [...]
Article
Juan Jose Sanz, Auteur ; Vicente Garcia-Navas, Auteur ; Juan V. Ruiz-Peinado, AuteurCompared to coniferous forests, deciduous woodlands have often been considered a more suitable habitat for Blue and Great Tits. We compared reproductive parameters of both species in oak woodland and pine plantation patches within a Mediterranea[...]
Article
Juan Jose Sanz, Auteur ; Vicente Garcia-Navas, AuteurWe test the consequences, in terms of breeding success and parental effort, of eggshell pigmentation pattern in a hole-nesting bird, the blue tit Cyanistes caeruleus that lays eggs asymmetrically speckled with reddish spots (maculated eggs). We [...]
Article
Ismael Galvan, Auteur ; Juan Jose Sanz, Auteur
Article
Oscar Gordo, Auteur ; Juan Jose Sanz, AuteurRemote sensing data have been used in previous studies to assess the effects of winter ecological conditions in Africa on biological parameters recorded in bird populations during the following breeding season in Europe. Based on the results of [...]
Article
Vicente Garcia-Navas, Auteur ; Juan Jose Sanz, AuteurOver a five-year period we monitored breeding parameters in a colony of Tree Sparrows Passer montanus in central Spain. This multi-brooded species can raise one to three broods per season. In this study, we analyzed inter-brood variation in repr[...]
