| Jensen, Fuller, Robinson | W.F., T.K., W.L. | Wolf, Canis lupus, distribution on the Ontario-Michigan border near Sault Ste. Marie. | 1986 | Can. Field Nat. 100(3):363-366 |
From USDI 1988:
"High human densities, as indicated by road densities, apparently serve as a barrier to wolf dispersal into Michigan. Evaluation of road densities may aid in estimating the impact of development on established wolf populations, or in predicting likelihood of reestablishing wolves in an area."