TABLE 2 



Seabird densities (sitting birds/ 10 min transect and 



birds/km-) in each water type in the northwest 



Bering Sea during July and August 1988. 



Seabird Species 



Northern Fulmar 

 Short-tailed Shearwater 

 Fork-tailed Storm-Petrel 

 Herring Gull 

 Glaucous Gull 

 Black-legged Kittwake 

 Common Murre 

 Thick-hilled Murre 

 murre sp. 

 Parakeet Auklet 

 Least Auklet 

 Crested Auklet 

 auklet sp. 

 Tufted Puffin 

 Homed Puffin 



total murres 

 total auklets 



TOTAL 



68.2 



49.1 



41.7 



30.: 



significantly different among the three water types. The trend 

 was for shallow-feeders to be more abundant in CCW than in 

 BSW or ASW (Fig. 3). Deep-feeding bird abundances were 

 significantly higher in CCW than in either ASW or BSW. Bird 

 densities in ASW and BSW were not apparently different, 

 however (Fig. 3). Densities of murres, particularly common 

 murres {Urio aalge). made up the majority of the deep divers 

 in CCW. Plankti vore distributions were significantly different 

 among water types. These were much more abundant in ASW 

 than BSW or CCW, and differences between BSW and CCW 

 could not be detected (Fig. 3). Piscivorous seabirds, 

 predominantly murres and black-legged-kittiwakes {Rissa 

 tridactyla), were also significantly different in abundance 

 among water types. Birds with this prey preference were more 

 abundant in CCW than either ASW or BSW. The latter two 

 water types did not have different bird densities (Fig. 3). 



Zooplankton (number of zooplankters/km-). or potential 

 prey of planktivores, was more abundant in ASW and BSW 

 than CCW. Between ASW and BSW, zooplankton densities 

 were not significantly different, although abundance in ASW 

 exceeded that of BSW (Fig. 4). 



Fig. 3. 



BSW CCW 



water type 



BSW 

 water tvpe 



Mean densities (plus/minus one standard error) of seahirds grouped 

 by foraging method (A) and prey preference (B), in three water types 

 in the northwest Bering Sea. ASW = Anadyr Stream water. BSW = 

 Bermg Shelf water, CCW = Chukchi Coastal water. 



39" 



