Razmatranja o ekologiji gniježđenja rusog svračka (Lanius collurio Linnaeus, 1758) i riđoglavog svračka (Lanius senator Linnaeus, 1758) u kontekstu ptičjih zajednica na području zapadne Istre

摘要

In July and August 2013, in an area of Western Istria, research into the co-presence of the red-backed shrike (Lanius collurio) and the wood chat shrike (Lanius senator) was carried out among the bird communities within 17 parcels of land, delimited by the main vehicular roads. Among 60 shrike settlements, 6 sympatric settlements were found, in which the woodchat shrike is dominant over the red-backed shrike in large open areas, while the latter presents a higher colonizing capability. A comparison of the bird communities by means of the Bray-Curtis similarity coefficient indicated the existence of a cluster made up of central and northern parcels of land characterized by a better environmental quality, in which the highest diversity indexes were found.