FAUNA OF THE ALEUTIAN ISLANDS AND ALASKA PENINSULA 13 



Charadrius semipahnatus Semipalmated plover 



Pluvialis dominica fulva American golden plover 



Arenaria interpres interpres Ruddy turnstone 



Tringa glareola Wood sandpiper 



Erolia acuminata Sharp-tailed sandpiper 



Larus hyperboreus hyperboreus Glaucous gull 



Lams schistisagus Slaty-backed gull 



Lanes argentatus vegae Herring gull 



Larus ridibundus sibiricus Black-headed gull 



Sterna aleutica Aleutian tern 



Aethia pygmaea Whiskered auklet 



Cuculus saturatus horsfieldi Oriental cuckoo 



Luscinia calliope camtschatkensis Siberian rubythroat 



Troglodytes troglodytes ssp. (in part) Winter wrens 



Motacilla alba lugens White wagtail 



Emberiza rustica latifascia Rustic bunting 



MAMMALS 



SCIENTIFIC NAME COMMON NAME 



A lopex lagopus Blue fox 



Ursus arctos gyas Brown bear 



Ursus arctos middendorffi Brown bear 



Some of these are only occasional visitors, such as the two 

 eagles mentioned, and Larus schistisagus (slaty-backed gull), 

 Larus ridibundus sibiricus (black-headed gull), Cuculus saturatus 

 horsfieldi (oriental cockoo), and some others. Some have become 

 established in the Aleutians, such as Anas crecca (common teal), 

 Aethia pygmaea (whiskered auklet), and Sterna aleutica (Aleu- 

 tian tern), and Alopex lagopus (blue fox). Others have reached 

 the Alaskan coast in general, including the Aleutian district, but 

 not necessarily by the Aleutian route, such as Falco rusticolus 

 uralensis (Asiatic gyrfalcon), Pluvialis dominica fulva (Ameri- 

 can golden plover), and the big brown bears. Some, such as 

 Charadrius semipalmatus (semipalmated plover) and Branta 

 nigricans (black brant), have extended eastward considerably 

 beyond the Alaskan Peninsula but show greater affinity with 

 Asiatic populations than with those farther east in North Ameri- 

 ca. In the case of the winter wrens, Troglodytes troglodytes, the 

 origin appears to have been from Asia and from the southeast. 

 Of course, the bears came by the more remote northern route. 



Plants, too, have begun the long traverse over from Asia. 

 In the case of plants which occur widely on both sides of Bering 

 Strait, and which have become established all the way through 

 the Aleutian chain, it is difficult to know the direction from 

 which their immigration took place. There are some plants that, 

 according to Hulten's distribution maps (1937a), have obtained 



