Offspring sex ratios in wild bird populations, and the extent to which they vary from the
equality expected by random genotypic sex determination, have received much recent …

We explored sex‐biased mortality patterns in a species showing the most extreme sexual
dimorphism among birds, the great bustard Otis tarda. Between 1991 and 2005 we studied …

The breeding potential of a monogamous animal population should be maximal during
equal operational sex ratio, and empirical evidence suggests that the population‐wide sex …

Summary 1 We investigated the causes of natal dispersal in four Spanish areas where 35
breeding groups of the polygynous great bustard Otis tarda were monitored intensively. A …

We studied the effects of female distribution, topography, and human infrastructures on lek-
site selection in a ground-displaying bird, the great bustard Otis tarda. Our aim was to …

Flight directions of Great Bustards Otis tarda after take-off were used to analyse effects of
power lines on spatial movements of this highly endangered bird species. Data on flight …

Collisions with power lines represent an important mortality factor for Great Bustards Otis
tarda throughout the distribution range of the species. This study evaluates the success of …

We studied foraging habitat selection by Lesser Kestrel Falco naumanni throughout the
breeding period in south-west Spain by means of transects on which foraging observations …

Olive groves in the Mediterranean basin have undergone a tremendous increase during the
last two decades, with most of the new olive groves being planted on arable land. This …

In conservation biology, population monitoring is a critical step, particularly for endangered
groups, such as steppe birds in European agro-ecosystems. Long-term population …