Alberto Lizarraga

Aranzadi Science Society

We analyzed changes in the composition of the community of birds of prey and corvids in a rainfed agrosystem after the transformation of 37.2 % of the sampled area into irrigated land between 2005 and 2020. We sampled 57 transects (372 km per year) and fitted generalized linear mixed models (GLMM) to study changes in species occurrence. Our results...

Capsule Barn Owls Tyto alba and Red-billed Choughs Pyrrhocorax pyrrhocorax show differential breeding outputs as a consequence of sharing nest boxes. Aims To describe for the first time a commensal relationship between the Red-billed Chough and the Barn Owl during the breeding period. Methods During systematic monitoring of 90 nest boxes installe...

The Iberian Green Woodpecker is an endemic species of the Iberian Peninsula that has been little studied. We describe the nesting habitat selection of this species in the three biogeographic regions where the species is located. The characteristics of 78 trees with occupied nests and 312 other randomly chosen trees in the vicinity of the nests were...

The research, carried out from 1997 to 2001, deals with the ecology of the Red-backed Shrike in Navarre. In chapter 1, the breeding range of the species in Navarre is defined, evaluating its relationship with vegetation type. Breeding density and foraging habitat selection are determined in each of the selected census plot. The possible factors tha...

The migratory behaviour of European Song Thrush (Turdus philomelos) populations ranges from resident in the south and west to partly or totally migratory in northern, central and eastern Europe. This varied migratory behaviour could be reflected in morphological adaptations, with migrants having a proportionally longer wing, lower tail:wing ratio,...

We compile the information available for Spanish Sparrow (Passer hispaniolensis) in the provinces of Navarra and Huesca (northern Spain) until 2022 and add the results of specific censuses carried out in the spring of 2023. It is confirmed that the presence of this species in the area was practically anecdotal, with only 5 records in the last 20 ye...

Durante cinco años se ha llevado a cabo un seguimiento de la población de cernícalo vulgar Falco tinnunculus y lechuza común Tyto alba mediante anillamiento de pollos en cajas nido y adultos capturados con trampas bal-chatri y redes niebla con reclamo sonoro digital en Navarra, Aragón, La Rioja y Valencia. En total se han anillado 515 ejemplares de...