Dispersal of invasive species by drifting

• Published in: Current zoology 2011-12, Vol.57 (6), p.818-827
• Main Authors: Riel, M.C. Van, Der Velde, G. Van, De Vaate, A. Bij
• Format: Article
• Language: English
• Subjects: Amphipods; benthic invertebrates; Colonization; corophium-curvispinum crustacea; Daily rhythms; dikerogammarus-villosus; Drift; field experiments; fresh-water shrimps; Invaders; lower mississippi river; macroinvertebrate drift; ponto-caspian invader; recent colonizer; Seasonal variation; small stony stream; 分布范围; 动物总数; 外来入侵物种; 扩散; 无脊椎动物; 显示模式; 水生生物; 漂流
• ISSN: 1674-5507; 2396-9814
• DOI: 10.1093/czoolo/57.6.818

Drifting can be an effective way for aquatic organisms to disperse and colonise new areas. Increasing connectivity between European large rivers facilitates invasion by drifting aquatic macroinvertebrates. The present study shows that high abundances of invasive species drift in the headstream of the river Rhine. Dikerogammarus villosus and Chelicorophium cur- vispinum represented up to 90% of the total of drifting macroinvertebrates. Drift activity shows seasonal and diel patterns. Most species started drifting in spring and were most abundant in the water column during the summer period. Drift activity was very low during the winter period. Diel patterns were apparent; most species, including D. villosus, drifted during the night. Drifting macroinvertebrates colonised stony substrate directly from the water column. D. villosus generally colonised the substrate at night, while higher numbers of C. curvispinum colonised the substrate during the day. It is very likely that drifting functions as a disper- sal mechanism for crustacean invaders. Once waterways are connected, these species are no longer necessarily dependent on dispersal vectors other than drift for extending their distribution range