Charles Joseph Krebs FRSC FAA FRZS (born 17 September 1936) is a professor emeritus of population ecology in the University of British Columbia Department of Zoology.

[3] The voles had no place to migrate therefore the final crash seemed to stem from an increase of competition, aggressive behaviour, and decreased resources.

[3] Krebs also worked in British Columbia and Northern Canada for over 40 years to look at cyclic populations of mammals.

[3] He found that the population size of the snowshoe hares is regulated by predators such as the lynx, coyote, great horned owls and goshawks.

It enriches our lives.A summary of Krebs work and his influence on students and colleagues (Judith H. Myers, Stan Boutin, Rudy Boonstra and Tony Sinclair can be seen in a series of seminars entitled "Krebs´ ecologists: on population regulation"