lil il ih l i li li l i lili l il il il i lffffi 



1 1 1 [ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 r+4f ^+H+^W4 

 61 155 149 143 



Figure 18. — Aerial survey tracklines flown in Ihe eastern Chukchi and western 

 Beaufort Seas on 18-20 June 1976. The dot (highlighted b> an arrow) represents 

 one bow head whale seen. 



69 



63 



157 



Figure 20. — Aerial surve> tracklines flown in Ihe northern Bering and southern 

 Chukchi Seas on 8, 9, 10, 11, 12, 13, and 14 June 1976. Dots represent presence 

 of white whales: a total of 18 whales were counted with a mean group size of 1.6 

 (SD 1.41. 



Figure 19. — Aerial survey tracklines flown in the eastern Chukchi and western 

 Beaufort Seas on 1, 4, and 5 June 1976. Dots represent presence of white whales: 

 a total of 177 whales were counted with a mean group size of 11.1 (SD 32.0). 



July 



No aerial surveys were flown in July 1976, 1977, or 1978. 

 August 



Aerial surveys were flown on 17-26 August 1976 over open 

 water (Fig. 22). Four bowhead whales were observed together 

 on 19 August east of Point Barrow. 



Sighting records of bowhead whales from other OCSEAP 

 contractors have been sent to us. In August 1975 Carleton 

 Ray" sighted 74 bowheads northeast of Icy Cape (about lat. 

 70°34'N, long. 161°00'W). Ray's data and ours from 1975 

 suggest that at least some bowheads may not have been able 

 to complete their migration into the Beaufort Sea that year 

 because of the heavy pack ice. Ice did not restrict their migra- 

 tion, however, from 1976 to 1978. 



"C. Ray. Johns Hopkins University, Baltimore, Md., pers. commun. 21 Janu- 

 ary 1978. 



i h lil I i l i lilili lil ili l il ili hlil i 



Beaufort Sea 



1 1 1 1 V 



73 



69 



143 



Figure 21. — Aerial survey tracklines flown in the eastern Chukchi and western 

 Beaufort Seas on 18, 19, and 20 June 1976. Dots (highlighted by arrows) repre- 

 sent presence of white whales: a total of 73 whales were counted with a mean 

 group size of 36.5 (SD 34.6). 



14 



