Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

Environmental Sciences

External Link

2013

Invasive species

Articles 1 - 1 of 1

Full-Text Articles in Entire DC Network

Seasonal And Vertical Distribution, Food Web Dynamics And Contaminant Biomagnification Of Cercopagis Pengoi In Lake Ontario, Joseph Makarewicz, Elizabeth Damaske, Corey Laxson, Hugh Macisaac, Ivan Grigorovich May 2013

Seasonal And Vertical Distribution, Food Web Dynamics And Contaminant Biomagnification Of Cercopagis Pengoi In Lake Ontario, Joseph Makarewicz, Elizabeth Damaske, Corey Laxson, Hugh Macisaac, Ivan Grigorovich

Joseph C Makarewicz

During the early growth season of 1999 to 2001, Cercopagis abundance in offshore waters of Lake Ontario remained low (less than 30 individuals/m3). From late July, its abundance increased rapidly until it peaked during August. After first appearing in 1998, maximum offshore abundance in Lake Ontario decreased each year since 1999 (1999:1759/m3; 2000: 679/m3; 2001: 355/m3). Cercopagis appears not to migrate below the thermocline and is restricted to the epilimnion. A comparison of pre- and post-invasion average abundance of Daphnia retrocurva, Bosmina longirostris and Diacyclops thomasi suggests that Cercopagis is having a major effect on zooplankton composition and abundance in …