ECOLOGY OF ISLE ROYALE. 389 



NOTES ON ISLE ROYALE MAMMALS AND THEIR ECOLOGICAL 



RELATIONS. 



BY DK. CHAS. C. ADAMS. 



/. Introduction. 



The following notes on the mammals should be considered supple- 

 mentary to those published concerning the collections made by the 

 Museum party during 1904.* The specimens were largely collected by 

 N. A. Wood and Max M. Peet, although others were taken by Dr. R. A. 

 Brown, 0. M'Creary and W. P. Holt. Unfortunately the ecological 

 relations of the mammals could not receive the attention in the field 

 which their importance deserved. 



For the determination of all doubtful specimens we are indebted to : 

 Dr. C. Hart Merriam, Chief of tlie Biological Survey of the U. S. De- 

 partment of Agriculture; to Mr. W. H. Osgood and Mr. E. W. Nelson 

 of the same survey; and to Dr. Glover M. Allen, of the Boston Society 

 of Natural History, for the determination of certain bats. 



In the references to the literature, no attempt has been made to cite 

 all authorities for the ecological notes or those of geographic range, 

 but enough are given to furnish an index to such literature as will be 

 of special interest to the Michigan student. 



Although Isle Royale is an almost uninhabited region, except for the 

 summer visitors, yet its original condition has been modified in several 

 important respects. Thus forest fires have at various times swept over 

 large areas of the eastern half of the island, and trappers have extermi- 

 nated the beaver and perhaps other species. 



The location of the old trading posts is of interest because of their 

 relation to mammal remains, suich as antlers, which have been, and 

 may be again found. Dr. Lane ('98, p. 3) cites the location of several 

 of these posts and others are given on the IT. S. Land OflSce map by 

 Ives; these difi'erent posts were located as follows: 



1. Near Washington Harbor, Sec. 2, T. 63 N., R. 39 W. American 

 Fur Co. 



2. Head of Siskowit Bay, Sec. 2, T. 63 N., R. 37 W. Amierican Fur 

 Co. Trading post and fishery. 



3.. On south shore of Siskowit Bay, Sec. 35, T. 64 N., R. 37 W. 

 American Fur Co. Trading post and fishery. 



4. Near Hay Bay, Sec. 24, T. 64 N., R. 37 W. Hudson Bay Co. 



5. On the north shore of Fish Island, Sec. 35, T. 67 N., R. 34 W. 

 American Fur Co. Trading and fishing post. 



6. Near Card Point, (cf. Lane, '98, p. 3.) 



It would be of considerable interest if the records of the fur com- 

 panies could be examined for information bearing upon the original 



* An Ecological Survey In Northern Michigan, 1906, pp. 131-133. 

 51 



