@misc{Padilla_David_P_Prey_2007, author={Padilla, David P and Nogales, Manuel and Marrero, Patricia}, editor={Museum and Institute of Zoology, Polish Academy of Sciences}, copyright={Rights Reserved - Free Access}, address={Warsaw}, howpublished={online}, year={2007}, language={eng}, abstract={Size-related selection of insular lizards by two sympatric predatory bird species (Southern Grey Shrike and Eurasian Kestrel) was studied in an arid insular environment. The endemic lizard genus Gallotia was a key resource in the diet of both predators, constituting more than 50% of the total biomass. Shrikes captured smaller lizards than kestrels during all seasons (mean snout - vent length (SVL): 7.4 ±1.9 vs. 9.4 ± 2.1 cm respectively), presenting a sequential use of lizard sizes and avoiding potential competition. On the other hand, shrikes and kestrels showed the same seasonal variation pattern, capturing the largest lizards during their breeding periods (spring). Considering lizard availability, shrikes displayed less selective predation than kestrels in all seasons. Shrikes positively selected the medium lizard size (SVL: 5–10 cm) during the nestling period, but negatively selected the small lizard size (SVL: < 5 cm) in autumn and winter, probably due to an explosion of juvenile lizards. Lastly, kestrels appeared to be more selective, negatively choosing the small lizard size but positively selecting the largest ones all the year round (SVL: > 10 cm).}, type={Text}, title={Prey Size Selection of Insular Lizards by Two Sympatric Predatory Bird Species}, volume={42}, number={2}, journal={Acta Ornithologica}, publisher={Museum and Institute of Zoology, Polish Academy of Sciences}, publisher={Natura Optima Dux Foundation}, keywords={Kestrel, Falco tinnunculus, Southern Grey Shrike, Lantus meridionalis, Tenerife Lizard, Gallotia galloti, feeding ecology, prey selection, Canary Islands, pustułka zwyczajna, pustułka, sokół pustułka, dzierzba śródziemnomorska}, }