EAC 32, Tioga County, December 1967
Page 41
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Transcription
The distribution of albatross during this survey was not random. On 4 December 24 birds were recorded in section R in the northwest corner of the grid. This is the highest number of birds yet recorded on one day of observation. This also is the first time that the highest concentration of albatross has occurred in the northwest section. It is to be noted that the two low counts in sectors S (north central) and Z (southeast) are in areas where little diurnal coverage was achieved. Since birds accumulate during the day, with highest numbers when garbage is dumped, a small linear mile coverage in an area in the morning hours will normally result in low numbers of albatross recorded. Of the 39 birds examined for rump color, 34 (87 percent) were immatures dark-rumped). Small numbers of white-rumped birds recorded indicate that the adult birds have returned to the breeding islands. Fulmar (Fulmarus glacialis) Number observed: 24 All were dark phase birds. The presence of birds in the southern portion of the area was not expected. In January and February sightings in the southern section accounted for less than one percent of the observations. On tenuous evidence I suggest that when these birds arrive on the winter- ing grounds they go through a "shuffle period", one of wandering in search of a relatively constant food supply. Thus, arriving birds would be well scattered until they finally settle in "winter ranges" (this may also hold for immature Black-footed Albatross during early winter). During this survey, however, their distribution was not random. Sooty Shearwater (Puffinus griseus) Number observed: 79 Seventy two percent of the birds were recorded in the northeast corner of the grid. The birds were evenly dis- tributed in other areas of the grid. No directional movement was recorded indicating that the "secondary migration" recorded on EGS 17 has terminated or reached a pause. Sooties were recorded in a feeding flock also containing Herring Gulls and Jaegers. Leach's Storm Petrel (Oceanodroma leucorhoa) Number observed: 81 A concentration (37 percent of observations) was recorded in the northeast corner of the grid. Observing conditions were very poor for sighting storm petrels due to the heavy seas and ship's characteristics (discussed above). Thus the quantitative observations on this species are not indicative of actual numbers. Fork-tailed Storm Petrel (Oceanodroma furcata) Number observed: 2 Single birds observed in sections R and V.