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Documents disponibles écrits par cet auteur (8)
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Article
Jennifer A. Border, Auteur ; Lydia R. Atkinson, Auteur ; Ian G. Henderson, Auteur ; Ian R. Hartley, AuteurIt is important to assess the effect that research activities may have on animals in the wild, especially when key parameters, such as breeding success, could potentially be influenced by observer activity. For birds, some studies have suggested[...]
Article
Jennifer A. Border, Auteur ; Ian G. Henderson, Auteur ; John W. Redhead, Auteur ; Ian R. Hartley, AuteurWe determined breeding season habitat preferences for a declining migrant grassland bird, the Whinchat Saxicola rubetra, using intensive, territory-scale habitat and invertebrate data, and independently gathered landscape-scale field survey and [...]
Article
Mark C. Mainwaring, Auteur ; Megan Dickens, Auteur ; Ian R. Hartley, AuteurThe outcome of sibling competition for food is often determined by variation in body size within the brood and involves trade-offs; traits that enhance competitive ability within the nest may be developed at the expense of traits that enable eff[...]
Article
John Wilson, Auteur ; Ian R. Hartley, Auteur
Article
Jennifer A. Border, Auteur ; Ian G. Henderson, Auteur ; Dominic Ash, Auteur ; Ian R. Hartley, AuteurPopulations of Afro-Palearctic migrant birds have shown severe declines in recent decades. To identify the causes of these declines, accurate measures of both demographic rates (seasonal productivity, apparent survival, immigration) and environm[...]
Article
Mark C. Mainwaring, Auteur ; Ian R. Hartley, AuteurNest building requires parental investment and we should expect to find trade-offs between building and other behaviours or demands. For example, species breeding in temperate zones face the seasonal shift from spring to summer and might alter t[...]
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Mark C. Mainwaring, Auteur ; Megan Dickens, Auteur ; Ian R. Hartley, AuteurSexual size dimorphism results in asymmetric sibling competition, and nestlings of the smaller sex are expected to prioritise the development of those morphological characters that maximise effective sibling competition. In this study, we test t[...]
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Megan Dickens, Auteur ; Ian R. Hartley, AuteurIn altricial birds, nestlings usually respond to the sound and appearance of the provisioning adults by begging for food when the adults arrive at the nest. Nestlings can, however, also beg incorrectly on hearing misleading sounds in the environ[...]
