Abstract Cuscuta campestris is one of the most widespread and harmful parasitic plants in world. It regularly infests economically important crops substantially reducing their yield. Its host preference has been frequently investigated natural habitats, but studies have usually performed at only site. In this study, I tested hypothesis that host-preference a single site provide information abou...

Species living in highly fragmented landscapes often occur as metapopulations with frequent population turnover. Turnover rate is known to depend on ecological factors, such as population size and connectivity, but it may also be influenced by the phenotypic and genotypic composition of populations. The Glanville fritillary butterfly (Melitaea cinxia) in Finland uses two host-plant species that...