Dispersal of invasive species by drifting

M.C. van Riel, G. van der Velde, A. bij de Vaate

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

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 acroinvertebrates. The present study shows that high abundances of invasive species drift in the headstream of the river Rhine. Dikerogammarus villosus and Chelicorophium curvispinum 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 dispersal 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.
Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Aquatic Invasive Species, April 21-25, 2013, Ontario, Canada
Pages29-29
Publication statusPublished - 2013
Event18th International Conference on Aquatic Invasive Species, Ontario, Canada -
Duration: 21 Apr 201325 Apr 2013

Conference

Conference18th International Conference on Aquatic Invasive Species, Ontario, Canada
Period21/04/1325/04/13

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