Range compression of migratory passerines in wintering grounds of the Western Mediterranean: conservation prospects

摘要: Because migrant birds occur in different parts of the world seasons, their numbers may be limited by size smallest area they inhabit during year. In addition, restricted ranges make populations more susceptible to local perturbations such that range is frequently considered a correlate species vulnerability. Despite this, little known about balance between seasonal partially migratory species. These migrants are difficult segregate from sedentary conspecifics winter grounds and thus extent assess. Here, we studied potential breeding wintering 10 partial passerines moving Iberian Peninsula Maghreb. After testing connectivity individual species, used niche modelling calculate 1,113 pairs ring recoveries linking individuals localities. The results indicate most show all them compression relative range, with scores ranging 19% 58% (mean 37%) ranges. We discuss importance non-breeding for conserving Western Mediterranean Basin, an under pressure climate change agricultural intensification.