Ecological significance of morphometric variation in three sympatric phylloscopus warblers

摘要: Measurements of 11 morphometric characteristics coexisting populations the willow warbler Phylloscopus trochilus, wood Ph. sibilatrix, and chiffchafT collybita revealed following results: (1) chifTchafT resemble each other much more than they do warbler; (2) all three species are significantly sexually size dimorphic, degree dimorphism decreasing from small to large (3) males females were same size, while fell between males; (4) measurements body dimorphic those bill, which, on hand, intrasexually variable; (5) occupying territories in deciduous mixed woodland study area larger nearby spruce-dominated woodland; (6) site tenacious smaller ones area. These results suggest that these warblers, sexual is a result selection intraspecific competition. Furthermore, at least warbler, spacing fits Fretwell's ideal despotic habitat distribution model, food competition expected be intense either two species, if there any