Dispersal of invasive species by drifting  

作　　者：M.C. VAN RIEL G. VAN DER VELDE A. BIJ DE VAATE 

机构地区：[1]Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Ecophysiology, Section Aquatic Animal Ecology, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands [2]Team Freshwater Ecology, DLO-Alterra, P.O. Box 47, 6700 AA Wageningen, The Netherlands [3]Netherlands Centre for Biodiversity Naturalis, EO. Box 9517, 2300 RA Leiden, The Netherlands [4]Waterfauna Hydrobiologisch Adviesbureau, Oostrandpark 30, 8212 AP Lelystad, The Netherlands

出　　处：《Current Zoology》2011年第6期818-827,共10页动物学报（英文版）

摘　　要：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

关 键 词：AMPHIPODS INVADERS COLONIZATION DRIFT Daily rhythms Seasonal variation 

分 类 号：X176[环境科学与工程—环境科学] F592.3[经济管理—旅游管理]