Station 



Station 



Fig. 4. Vertical cross-section profiles of lemperaturc (in °C) along five west 

 to east transect lines along the southern Chukchi Sea Continental 

 Shelf. Panels are arranged from north (top) lo south (bottom) 

 (cf. Frontispiece). 



Fig. 5. Vertical cross-.section profiles of salinity (in ppt) along five west to 

 east transect lines along the southern Chukchi Sea Continental Shelf. 

 Panels are arranged from north (top ) to south (bottom ) ( cf. Frontispiece ). 

 Isohales are illustrated in 0.5 ppt. 



Red Phalarope {Phalaropus fiilicarici) . Phalaropes were 

 absent from ACW but were recorded in both BSAW and SCW 

 where they were equally abundant (Table 2). Many of the 

 phalaropes tended to occur either near the boundary between 

 water masses or at locations with steep horizontal gradients in 

 salinity — for example. Stations 60. 70, and 72-73 

 (cf. Frontispiece, Fig. 2). Little is known about phalarope 

 distributions and autumn staging areas in the western Chukchi 

 Sea. Small flocks of 10-20 individuals were also observed 

 feeding in association with gray whales 

 ( Esch rictius robust us ) . 



Pomarine Jaeger (Stcrconihus ponutrinus) . Based on 

 10-min transect counts, Pomarine jaegers were most abundant 

 in SCW (Table 2), possibly because this water mass also had 

 large numbers of short-tailed shearwaters that jaegers could 



exploit t kleptoparasitize ) for food. Jaeger abundances derived 

 from the 15-min station counts (Table 3) were equal across the 

 three water masses. 



Long-tailed Jaeger (Stercorarius lonsicaudus) . Three 

 individuals of this jaeger species occurred in SCW near 

 Station 61 (Frontispiece). 



Hemn^GuW (Lams argeutatus) . Herring Gulls were most 

 abundant in SCW (Tables 2, 3). Although apparently not 

 nesting locally on the Soviet side of the .southern Chukchi Shelf 

 (e.g., NOAA, 1988), herring gulls breed on the Chukchi 

 Peninsula ( AOU, 1 983 ) and at Koozata Lagoon on St. Lawrence 

 Island in the northern Bering Sea (Fay & Cade, 1959; Sowls 

 etcii. 1978). The race that occurs in the southern Chukchi and 

 northern Bering Seas is the darker-mantled Siberian form, 

 L. a. vegac (Grant, 1986). 



384 



