EAC 26, Hall, October-November 1967
Page 29
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Transcription
pressure system in and to the west of the OPAREA dominated the weather for the first three days giving moderate to light northerly winds and cloudless skies. A weak low on 3 November brought in thick low clouds and occasional fog banks but little wind, and the seas became flat to glassy. Seas and winds remained very light as a high pressure cell moved in from the south and dominated the OPAREA from the 4th to the 7th producing light southerly winds and partly cloudy to clear skies. A brief cold front passed through the area on the 8th but was not severe and conditions remained excellent. Slick areas were noted almost every day particularly in the south central areas, where logs and floating debris were also noted. The slick areas previously noted on the east end of the northernmost leg were not in evidence, although the typically associated Red Phalarope flocks were seen. Eastern Grid Survey #16 Over 846 miles and 86.8 hours of diurnal observations 843 birds of 28 species were recorded. Ten birds of at least 4 species were re- corded over 20 miles of nocturnal watch. Forty-eight birds of 8 species and 1 turtle were collected. Eight sera samples were taken (see Summary TABLES). Grid - General Overall Total .103 .266 2.570 .996 .354 1.330 .740 .449 1.465 .737 Sectional Linear Density Group % Total Leach's Storm Petrel 49.3 Phalaropes 22.8 Gulls 9.0 Shearwater/Petrels 8.0 "Waterfowl" 4.0 "Landbirds" 2.7 Tropicbirds 1.4 Jaegers 1.2 Misc. Charadiriformes 1.1 Misc. Birds 0.5 100.0 The influx of the expected wintering birds has not progressed rapidly since the previous survey. Black-legged Kittiwakes have yet to appear and alcids were represented by only one sighting. Fulmars have increased only slowly. Herring Gulls appear to be increasing gradually in the north and northeast. Red-tailed Tropicbirds from (probably) the Hawaiian post- breeding dispersion were present in moderate numbers. Surprisingly high numbers of three major Grid species; Red Phalarope, Leach's Storm Petrel, and Sooty Shearwaters all point to a secondary general migration peak in progress during the survey. Accidental landbirds are still significantly present in the northeast half of the Grid area. Oceanographic features