EAC 6, Shearwater, April 1967
Page 8
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Transcription
NON-GRID SUMMARY The non-grid portion of this cruise includes two periods of observation. The first includes parts of two days while enroute from Long Beach to the grid, while the second was one day between the grid and Long Beach. Because the bird populations encountered on these two tracks are quite different, each is treated separately (see table 7). On the first track 9.2 hours of diurnal observation were conducted over 87 linear miles. Collecting of specimens was done shortly before entering the grid. On the second track, 11.7 hours of observation were made over 113 linear miles, and again collections were made. The activity of birds in both non-grid areas was similar to that recorded last month, with the exception of an influx of Sooty and Pink-footed Shearwaters. The exodus of some of the winter residents was noted and the occurrence of some transients was also noted. As on previous trips, an effort to determine movements of birds between the coast and the grid was made, but there are still insufficient data to make any reasonable statements. Coastal-types of gulls were noted within thirty miles of the north leg of the grid, and as far as 60 miles off of San Clemente Island. Herring Gulls were found in both pelagic and coastal waters, but whether they move freely between the two will not be possible to determine without more sophisticated methods than are presently employed. The same holds true for the Jaegers. Flocking was a prominent activity on both non-grid tracks; most groups were resting or traveling migrants, but some flocks of resident gulls were also seen. This activity will be discussed in the species accounts. NON-GRID SPECIES ACCOUNTS Albatross All but one of the sightings were outside the Channel Islands. On the north