14_05022_carp.qxd 6/5/07 7:30 PM Page 83 Northern Range Expansion and Invasion by the Common Carp, Cyprinus carpio, of the Churchill River System in Manitoba PASCAL H. J. BADIOU1 and L. GORDON GOLDSBOROUGH1,2 1 Department of Botany, University of Manitoba, Winnipeg, Manitoba R3T 2N2 Canada; e-mail:
[email protected]; Present address: 48 DesMeurons Street, Winnipeg, Manitoba, R2H 2M1 Canada 2 Delta Marsh Field Station, University of Manitoba, Winnipeg, Manitoba R3T 2N2 Canada Badiou, Pascal H.J., and L. Gordon Goldsborough. 2006. Northern range expansion and invasion by the Common Carp, Cyprinus carpio, of the Churchill River system in Manitoba. Canadian Field-Naturalist 120(1): 83–86. Recent fisheries data from northern Manitoba indicates that the Common Carp (Cyprinus carpio) has extended the northern limit of its range. Additionally, it also appears that carp have invaded and established viable populations in the Manitoba portion of the Churchill River. Habitat degradation and altered flow regimes as result of hydroelectric development in north- ern Manitoba may have facilitated the expansion of carp in the region. Key Words: Common Carp, Cyprinus carpio, exotic species, range expansion, invasion, habitat disturbance, Manitoba. The Common Carp (Cyprinus carpio) was intro- phytes and creating an ecological feedback mechanism duced intentionally to Manitoba, Canada, when fish that perpetuates the turbid state (Scheffer 1998). Carp from Minnesota were stocked in the Assiniboine River physically disturb the sediment-water interface and the watershed southeast of Brandon in 1886 (Stewart and algae associated with sediment. These algae play a Watkinson 2004). These early attempts at introduc- major role in the stabilization of the bottom sediments tion failed, and carp only became established after pop- (Taylor et al.