6. New Zealand Shearwater (Puffinus bulleri) # Obs. = 2. One bird was chased by the skiff in Section 1 and one bird approached the ship in Section 8. All grid sightings to date have been in the west section, mostly in sub-section 1. Black Storm Petrel (Oceanodroma melania) # Obs. = 5. All five birds were recorded shortly before sunset on 15 September in Section 5. "Leach" Storm Petrels -- ' ++ -- ' 1 -- ' + l ' ++ '++ - ' - ' 1 --' - ' + - ' l' + --' --' -- + ' -' l l ' - ' ++ --' --' -- --' --' -- EGS # 10 - July 11 - August 12 - Aug-Sept. 13 - Sept. Total # Birds 236 400 199 97 Linear Density .000 - .099 = -- (double minus) .100 - .199 = - (minus) .200 - .399 = l (unity) .400 - .599 = + (plus) .600 - up = ++ (double plus) Storm Petrel numbers reached a peak in mid-August and have subsequently been halved twice. In July two density centers were present. In August birds in the southeast corner spread outward to the west and center areas of the grid, gradually dispersed and by September (EGS # 13) appear to have largely withdrawn, probably to the south. This density center I suspect is postbreeding movements of Guadalupe birds and other populations from the upper regions of Baja California. The second high density area was first noted in July around Point "Dogwood" and evidently moved slowly to the north while dispersing slightly westward. This region of density appears to be a fairly stable feature, and is probably partly due to oceanographic features resulting from the proximity to Point Conception. A general southward movement was noted, (particularly notice- able from skiff observations) during the present survey. Dark-rumped birds were proportionally lower than the preceding three surveys.