, and diversity in rivers, streams and riparian alder ecosystems of Central Europe.

Unlabelled: Waterways are ideal pathways for dispersal and potential introduction to terrestrial ecosystems. While many species from phylogenetic clades 6, 9 and 10 are predominant oomycetes in watercourses due to their adaptation to a lifestyle as saprotrophs and opportunistic pathogens of riparian plants, species from clades 2, 7 and 8 are predominantly soil- or airborne using aquatic habitats as temporal niches for spreading and invading terrestrial sites along the watercourses. In contrast to forest ecosystems, knowledge of diversity in watercourses in Central Europe is limited.