| coexistence of three species of leaf-feeding aphids (homoptera) onbetula pendula. | three sympatric aphid species of european origin (euceraphis betulae (koch),callipterinella calliptera (hartig) andbetulaphis brevipilosa börner) feed onbetula pendula roth in northern california. the component species of this guild partition resources by plant part, feeding sites within leaves and leaf phenological state. overall niche overlap between species reached a maximum of 49.9% betweenb. brevipilosa andc. calliptera. co-occurence ofe. betulae with both other species on leaves was random ... | 1986 | 28311783 |