David C. Lasenby
Professor Emeritus

B.Sc. (Trent), Ph.D. (Toronto) Office: ESC A112 Phone:  705-748-1011 ext 7967 Email: dlasenby@trentu.ca Webpage:

Taught:
BI102H: Current issues in Biology
BI 217H:  Population Ecology
BI 305:  LimnologyCurrent Issues in Biology I

Research Interests:
Limnology, food webs, accumulation and transport of contaminants by aquatic invertebrates.

Much of my research focuses on the vertical migration of invertebrates that feed on lake sediments as a pathway for the transport and reintroduction of contaminants and nutrients back into the water column. Specifically, it involves the measurement of the rates of uptake, accumulation and transport of trace metals from the sediments to the water column by organisms that live on the lake bottom but migrate into the water column. The research also involves the modelling of the movement of organic contaminants in lakes and the role of benthic-pelagic coupling in the redistribution of these contaminants.

Selected publications:

Patwa, Z., Christensen, R., Lasenby, D.C., Webster, E., Mackay, D.
2007. An exploration of the role of mysids in benthic-pelagic
coupling and biomagnification using a dynamic bioaccumulation model.
Environ. Toxicol. Chem. 26 (6): 186-194.
 
Zhao,X, M. Fox, D. Lasenby, A. Armit, and D. Kothawala. 2007. Substrate selection and seasonal variation in abundance and size composition of the isopod Lirceus fontinales in Ontario streams, Canada.  Chinese Journal of Oceanography and Limnology. 25: 215-220.

Richmond, S. and D. C. Lasenby. 2006. The behavioural response of mayfly nymphs (Stenonema sp.) to chemical cues from crayfish (Orconectes rusticus). Hydrobiologia, 560: 335-343.

Zhao, X., M.G. Fox, and D.C. Lasenby. 2006. Effect of prey density, prey mobility and habitat structure on size selection and consumption of amphipods by a benthic feeding fish. Arch. Hydrobiol. 165: 269-288.

Fraser,A.J., T.M. Cahill, D.C. Lasenby, D. Mackay and L. Milford. 2005.  The role of cannibalism and contaminant source on bioaccumulation in aquatic food webs.  Environ. Toxicol. Chem. 24. 909-915.
 
Lasenby, D. and Y. Shi. 2004 Changes in the elemental composition of the stomach contents of the opossum shrimp Mysis relicta during diel vertical migration. Can. J. Zool. 82: 525-528.
 
Evans R.D., and D.C. Lasenby. 2003. MC-ICP-MS determination of isotopic fractionation of cadmium in simple aquatic food chains. Geochemica et Cosmochimica Acta 67 (18): A87-A87 Suppl. 1 Sep 2003.