Invertebrate colonization of a new, man‐made stream in southern Sweden

摘要: SUMMARY. 1 The invertebrate colonization of a man-made stream, Flugstrommen, in southern Sweden was monitored for 18 months 1988 and 1989. Benthic samples were taken on twelve occasions from three sites (upstream, middle downstream) community structure compared with that at ten natural, permanent reference nearby. 2 The number species colonizing increased rapidly during the first 3 months. The increase most rapid upstream but levelled off second year this site, while numbers continued to downstream. 3 Simuliid earliest colonizers reached high densities year. Ephemeropteran plecopteran also occurred early on, whereas Coleoptera, Odonata Trichoptera were, average, slower colonize. Blackfly decreased after hydropsychids became numerically dominant. 4 The order functional feeding groups as predicted: filter feeders first, grazers/collectors intermediate, predators shredders last. 5 After year, Flugstrommen closely resembled lake-outlet streams situated area, although communities within stream similar one another. 6 The possible role competitive predatory processes determining observed successional patterns are discussed.