A MORPHOLOGIC AND GENETIC STUDY OF THE ISLAND FOX, UROCYON LITTORALIS.

The Island Fox, Urocyon littoralis, is a dwarf form found on six of the Channel Islands located 30-98 km off the coast of southern California. The island populations differ in two variables that affect genetic variation: effective population size and duration of isolation. We estimate that the effective population size of foxes on the islands varies from approximately 150 to 1,000 individuals.