as single birds.Both males and females were collected. Most haa 
some red feathers of the nuptial plumage present, but none were 
notec. co have significantly enlarged gonads. But the heavy 
fat condition on most specimens as well as the apparently increasing 
flocking tendency suggests that a migratory movement may be under 
way or imminent. 
Density distribution on this cruise was different from that 
recorded last month when the north and south sections were favored. 
This cruise no birds were seen in the north section, about 65% 
were in the central section, and the remainder were in the south. 
East-west distribution was also different from last month when 
the western section was highly favored. This cruise the western 
area still had the most dense population, but the east had fifteen 
".._m„s as many birds as last month. 
These changes when combined with the fact that the population 
has been steadily increasing suggests that, if not migrating, the 
population density is quite static. 
Pomarine Jaeger ( Stercorarius pomarinus) 2 
Jaeger sp. (Unidentified) 1 
The reduction of numbers suggests that the higher numbers 
noted last month were indicative of a migration peak. As in past 
cruises, all sightings were in the eastern portion of the grid. 
Glaucous-winged Gull ( Larus q laucescens ) 4 
Three of the four sightings were in the north section, and 
the other was in the central section. All were immature birds. 
The sharp overall reduction of numbers indicates that this 
species has probably migrated to the north. 
Herring Gull ( Larus a rqentatus ) 119 
The sharp change of distribution since previous cruises is 
