1 8 University of Michigan 



No trapping was done in the habitat, and no notes on mammals 

 were secured. Probably the mammal fauna is not very large. 



Muiaitain-heath habitat: A narrow, jworly developed belt 

 of heath fringes the upper edge of the rock cliff examined 

 north of Lake Gogebic. Characteristic plants are the blue- 

 berry and bearberry, mixed with creeping juniper and a few 

 scattered grasses. The habitat is very narrow and is closely 

 encroached upon by shrubs and trees, such as sumac, cherry, 

 white pine, jack pine, oaks, aspens, and paper birch. Signs 

 of fox were noted at the edge of the cliff, but no trapping was 

 carried on here. 



Air 



Aerial liabitat : The only aerial mammals are the bats, of 

 which four species were taken during the summer. The flying 

 squirrel is not considered to be a true aerial form. 



Burns and Clearings 



Fires have been numerous throughout northern Michigan 

 and a large part of the region is covered by various stages 

 in the succession following fires or clearings. The areas 

 studied were selected as representative of the natural condi- 

 tions of the peninsula, but even in these districts there are 

 many burned areas. 



Many large areas have been heavily logged over, sometimes 

 followed by fire, with a result similar to^ that of a fire. In the 

 region studied there are numerous small clearings, some of 

 which are in use as the residences of settlers, but most have 

 been allowed to revert to a wild condition. The stages in suc- 

 cession on an abandoned clearing seem to be similar to those 

 following a fire, and they are here considered together. 



Herbaceous stage: After a fire in a forest in this region 

 the first vegetation to spring up seems to be the herbs, of 



