Francisco Valera

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Fruit size in wild olives: implications for avian seed dispersal

P. J. Rey, Francisco Valera
1997

Frugivorous birds in the Mediterranean basin may disperse seeds using two different feeding behaviours: swallowing the fruit whole or pecking pieces of pulp. Swallowing is the common behaviour of… (More)

Early effects of rodent post-dispersal seed predation on the outcome of the plant–seed disperser interaction

Julio M. Alcántara, Pedro J. Rey, Alfonso M. Sánchez-Lafuente, Francisco Valera

We analysed two potential effects of post-dispersal seed predation on recruitment of the wild olive tree (Olea europaea var. syl6estris), a Mediterranean bird-dispersed tree: (a) the limitation of… (More)

Concentration of trace elements in feathers of three Antarctic penguins: geographical and interspecific differences.

Silvia Jerez, Miguel Motas, María José Palacios, Francisco Valera, José J Cuervo, A. G. S. Barbosa
Environmental pollution
2011

Antarctica is often considered as one of the last pristine regions, but it could be affected by pollution at global and local scale. Concentrations of Al, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Cd and Pb… (More)

Interspecific parasite exchange in a mixed colony of birds.

Francisco Valera, Alejandro Casas-Crivillé, Herbert Hoi
The Journal of parasitology
2003

Studies of avian host-parasite interactions rarely include consequences of relationships among hosts for either the host or parasite species. In this study, we examine the ectoparasitic burden of… (More)

Gastrointestinal parasites in Chinstrap Penguins from Deception Island, South Shetlands, Antarctica

Véronique Vidal, J. Ortiz, +8 authors A. Barbosa
Parasitology Research
2012

Knowledge about parasites of Antarctic birds is fragmented and scarce. The aim of this work is to contribute to the knowledge of gastrointestinal parasites of the Chinstrap Penguin (Pygoscelis… (More)

The European bee-eater (Merops apiaster) as an ecosystem engineer in arid environments

A. Casas-Crivill, Francisco Valera
2004

Arid environments are fragile ecosystems where management is particularly complicated. Determining target species that contribute to understanding the functioning of such environments is of basic… (More)

Plasticity of nest-site selection in the trumpeter finch: A comparison between two different habitats

Rafael Barrientos, Francisco Valera, A. G. S. Barbosa, Carmen M. Carrillo, Eulalia Moreno

In habitats with more predators, a species is expected to breed in safer sites and be less successful than in predator-impoverished habitats. We tested this hypothesis by studying nest-habitat… (More)

Social information in nest colonisation and occupancy in a long-lived, solitary breeding bird

Radovan Václav, Francisco Valera, Teresa M. Martinez
Oecologia
2010

Recent work increasingly reveals the importance of social information in individual dispersal decisions, population dynamics and conservation. Much of the knowledge gained to date comes from studies… (More)

Evaluation of large-scale dissemination of Nosema ceranae spores by European bee-eaters Merops apiaster.

Francisco Valera, Roberto Martín-Hernández, Mariano Higes
Environmental microbiology reports
2011

Identification of transmission routes and of factors affecting the spatial positions of pathogens, hosts and vectors is basic to an adequate disease management. Nosema ceranae is a Microsporidian… (More)

Low prevalence of haematozoa in Trumpeter finches Bucanetes githagineus from south-eastern Spain: additional support for a restricted distribution of blood parasites in arid lands

Francisco Valera, Carmen M. Carrillo, A. G. S. Barbosa, Eulalia Moreno
2003

We have investigated the prevalence of avian haematozoa in Trumpeter finches at two localities situated in arid habitats. This study reports the first record of infection for this bird species. Two… (More)

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