. The Canadian field-naturalist. Natural history. 2001 Beamish, Youson, Chapman: Status of Morrison Creek Western Brook Lamprey 575 of the variety in Morrison Creek is unknown after the summer period (Beamish 1985). Habitat Habitat studies conducted on the upper water- shed (Lough et al. 1995a*,b*; Knight and Blood 1997) indicate that the Morrison Creek area is char- acteristic of interlinking wetlands, with meadows, thick brush, beaver dams and open beaver ponds. The stream bed is dominated by compressed till with limited patches of small gravels and an abun- dance of stream debris which prov
. The Canadian field-naturalist. Natural history. 2001 Beamish, Youson, Chapman: Status of Morrison Creek Western Brook Lamprey 575 of the variety in Morrison Creek is unknown after the summer period (Beamish 1985). Habitat Habitat studies conducted on the upper water- shed (Lough et al. 1995a*,b*; Knight and Blood 1997) indicate that the Morrison Creek area is char- acteristic of interlinking wetlands, with meadows, thick brush, beaver dams and open beaver ponds. The stream bed is dominated by compressed till with limited patches of small gravels and an abun- dance of stream debris which provide habitat diver- sity. The creek is known for its Coho Salmon, Oncor- hynchiis kisutch, habitat and is a major contributor of Coho to the Puntledge River system (personal com- munication: Brian Allen, Department of Fisheries and Oceans, 148 Port Agusta, Comox, British Columbia). The specific habitat features required to support a polymorphic population of lamprey are not known. The area surrounding Morrison Creek has, in the past, been disturbed by logging and mining activities which contribute to its complex hydrology (Knight and Blood 1997). Evidence of development pres- sures are also seen in the mainstem of the creek where streambank degradation and the removal of in-stream debris has resulted in a loss of the pool/ riffle complex (personal communication: Brian Allen, Department of Fisheries and Oceans, 148 Port Agusta, Comox, British Columbia). General Biology The biology of the Morrison Creek variety is not fully understood. Aside from an extended post- metamorphic period and the ability to be parasitic, its biology is very similar to that of typical Lcimpetra richardsoni (Beamish 1985). Typical Lampetra hchardsoni from Morrison Creek in fresh water throughout their entire life cycle and begin to reproduce in May and June (Youson and Beamish 1991). The lamprey spawn only once and their eggs are deposited in river bed gravel. After hatching, the young quickly bur
Size: 1950px × 1282px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
