home *** CD-ROM | disk | FTP | other *** search
- b. September 17, 1936, St. Louis, Missouri
-
- Professor of Zoology Department of Zoology, University of BC, Vancouver, BC
-
- Charles ("Charley") Krebs grew up in a small Illinois town near St. Louis,
- Missouri. All through his high school years, Krebs worked for a St. Louis
- fur trading company harvesting seals in the Berring Sea during his summer
- vacations. After getting his bachelors degree from the University of
- Minnesota (1957), Krebs came to Vancouver, BC, to study with Dennis Chitty
- who was (and still is) the world expert on lemmings. Krebs obtained an MA
- (59) and a PhD (62) in Zoology from the University of British Columbia.
- Then, after a two-year fellowship at Berkeley, he went back home to teach
- Zoology at Indiana University. But in 1970 Krebs returned to Vancouver and
- has been there ever since as a professor of Zoology at UBC. Krebs has spent
- his working life trying to unravel the mystery of lemmings and other small
- Northern mammals whose populations crash regularly every four to ten years.
-
- The Krebs Effect, also known as the Fence Effect, is named after Krebs. He
- simply fenced in an area of grassland the size of a soccer field to see
- what would happen to the population of voles living inside the fence. (The
- fence extends down into the soil several inches to stop tunneling.) Within
- a year, he found the population of voles increased about 5 times. Over the
- years Krebs has systematically eliminated possible reasons for the Fence
- Effect. Krebs now believes that the effect is due to social behaviour among
- the voles. This includes the natural genetic selection for more aggressive
- individuals over time as living conditions become more crowded. The final
- crash seems to be caused by an increased tendency for mothers to kill all
- the babies in neighbouring nests.
-
- Sources: NSERC; personal interview
-
- © 1996 Softshell Small Systems Software Design Inc.
- All rights reserved