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Article
Jesus Gomez, Auteur ; Gustavo Linan-Cembrano, Auteur ; Macarena Castro, Auteur ; Alejandro Perez-Hurtado, Auteur ; Cristina Ramo, Auteur ; Juan A. Amat, AuteurQuantifying the pigment content in avian eggshells is important for the validation of hypotheses on the functionality of eggshell coloration. The few studies that have analysed whether eggshell coloration and spottiness are related to pigment co[...]
Article
Pedro Sáez-Gómez, Auteur ; Carlos Camacho, Auteur ; Alberto Álvarez, Auteur ; Nico Varo, Auteur ; Cristina Ramo, Auteur ; Andy J. Green, AuteurCapsule: The sex of Black-necked Grebes Podiceps nigricollis in Spain can be determined successfully using a locally derived discriminant function analysis (DFA) but a function derived from a North American population was not successful.Aims: To[...]
Article
Juan A. Amat, Auteur ; Nico Varo, Auteur ; Marta I. Sanchez, Auteur ; Andy J. Green, Auteur ; Cristina Ramo, AuteurWe tested if Black-necked Grebe, a species in which both sexes undertake moult-migration, have an unbiased sex ratio at a moulting site in Europe, as previously found in North America and as was expected for a species with biparental care. For t[...]
Article
Nico Varo, Auteur ; Andy J. Green, Auteur ; Marta I. Sanchez, Auteur ; Cristina Ramo, Auteur ; Jesus Gomez, Auteur ; Juan A. Amat, AuteurWe examined how availability of brine shrimps, Artemia parthenogenetica, influenced temporal aspects of foraging behaviour and population dynamics of moulting black-necked grebes, Podiceps nigricollis, from late August to early December in four [...]
Article
Anthony D. Fox, Auteur ; Cristina Ramo, Auteur ; Nico Varo, Auteur ; Marta I. Sanchez, Auteur ; Juan A. Amat, Auteur ; Andy J. Green, AuteurFrom August to December, thousands of Black-necked Grebes Podiceps nigricollis concentrate during the flightless moult period in salt ponds in the Odiel Marshes, southern Spain, where they feed on the brine shrimp Artemia parthenogenetica. We pr[...]
Article
Luis V. Garcia, Auteur ; Cristina Ramo, Auteur ; Cristina Aponte, Auteur ; Adela Moreno, Auteur ; Maria T. Dominguez, Auteur ; Lorena Gomez-Aparicio, Auteur ; Ramon Redondo, Auteur ; Teodoro Maranon, AuteurConservation management conflicts frequently arise when an overpopulation of a protected organism has negative effects on other valuable elements in the same ecosystem. We studied the interactions between a colony of protected tree-nesting wadin[...]
Article
Jesus Gomez, Auteur ; Ana I. Pereira, Auteur ; Alejandro Perez-Hurtado, Auteur ; Macarena Castro, Auteur ; Cristina Ramo, Auteur ; Juan A. Amat, AuteurIn ground-nesting birds egg colour and appearance may have evolved due to opposite selection pressures. Pigmentation and spottiness make the eggs darker and have been suggested to improve camouflage. However darker and more spotted eggs may reac[...]
