not all the warblers are residents in the forest at the same time of the year because of different migration patterns. not all the warblers are residents in the forest at the same time of the year because of different migration patterns. physiological differences in beak structure allow the warblers to consume different species of seeds through symbiotic relationships. physiological differences in beak structure allow the warblers to consume different species of seeds through symbiotic relationships. resource partitioning of the seeds reduces competition, and the five different species can live in the same tree. resource partitioning of the seeds reduces competition, and the five different species can live in the same tree. niche overlap occurs between the five different species, and living in the same tree increases competition for seeds.