The gardener owl: indirect seed dispersal and soil nutrient enrichment may enhance local plant biodiversity and alter its spatial distribution (with José María Fedriani University of Lisboa POR and María del Mar Delgado University of Helsinki FIN; internal EBD proposal call “Microproyectos” financed by the Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Program for Centres of Excellence in R+D+I SEV-2012-0262)