Occasional Papers of the Museum of Zoology ii 



Grassy-iiicadozi' Jiabitat: Part of the beaver meadow studied 

 near Gogebic Lake is covered by a thick growth of grasses 

 and sedges of a number of species. The ground of the habitat 

 was rather dry and had been burned over the previous year. 

 Grasses are also dominant over a few small areas near Mud 

 Lake in Gogebic County. On a small area of the clearing 

 near this lake a thick stand of bluegrass (Poa) is almost the 

 only plant present. This occurs on an area of fairly moist 

 mud. On the drier slope near the forest Poa also is abundant, 

 forming the dominant species over a strip about 5 to lo meters 

 wide. Jumping mice are common in this habitat. 



Alder-thickct habitat: On very wet ground just below an 

 old beaver dam near Gogebic Lake there is a heavy growth 

 of alder (Alniis incana) about 20 feet high. No other shrubs 

 were noted in the thicket. The ground under the alders is 

 mostly bare, there being only a few ferns, grasses, and other 

 herbs. On the ground are many dead sticks fallen from the 

 alders. This situation contained few mammals, only one 

 Blarina being taken in four days' trapping with 25 traps. At 

 the south end of the beaver meadow willows and alders are 

 invading the sedges in very wet ground. No trapping was 

 done in this situation. 



Swamps 



Black ash szvamp habitat: A number of black ash swamps 

 occur along the shores of Gogebic Lake, being apparently par- 

 tially flooded during periods of heavy rains and during stages 

 of high water. In a swamp of this type near the north end 

 of Gogebic Lake on the west side, black ash (Fraxinits nigra) 

 is the dominant tree, the trunks reaching diameters up to 2 

 feet. Elms {Uhmis americana) sometimes reaching a trunk 

 diameter of 3 feet are common, and yellow birches and hard 

 maples are common also. Black maples are rare, and lindens 



