EAC 38-40, Sioux City, March-May 1968
Page 9
Image from the Biodiversity Heritage Library. Contributed by Smithsonian Institution Archives. | www.biodiversitylibrary.org
Transcription
4 Leach's Storm Petrel (Oceanodroma leucorhoa) No. Obs.: 59 storm petrel sp. No. Obs.: 25 Leach's Storm Petrel storm petel (sp) R = 19 (.158) S = .13 (.138) T = 8 (.082) R = 3 (.025) S = 22 (.234) T = 0 U = --- V = 12 (.130) W = 7 (.127) U = --- V = 0 W = 0 X = --- Y = --- Z = --- X = --- Y = --- Z = --- Combined: R = 22 (.183) S = 35 (.372) T = 8 (.082) U = --- V = 12 (.130) W = 7 (.127) X = --- Y = --- Z = --- Storm Petrels again appear to be moving into the northern sections of the Grid. It is not possible to predict the origin of these birds nor the trend of the species distribution in the grid. The concentration of birds in Section S is of interest and probably indicates the presence of an oceanographic front, i.e., upwelling, in the area. Densities in Section T are strikingly low. All birds classified to rump color were white-rumped birds. Red Phalarope (Phalaropus fulicarius) No. Obs.: 3 Phalarope species No. Obs.: 6 Red Phalarope phalarope (sp) R = 1 (.008) S = 2 (.023) T = 0 R = 1 (.008) S = 3 (.032) T = 0 U = --- V = 0 W = 0 U = --- V = 0 W = 2 (.036) X = --- Y = --- Z = --- X = --- Y = --- Z = --- Combined: R = 2 (.016) S = 5 (.055) T = 0 U = --- V = 0 W = 2 (.036) X = --- Y = --- Z = --- Nothing can be determined from the distribution shown here except that the birds are present throughout the Grid. On the calm days of 28 and 29 March, 20 birds were recorded outside of the Grid area as the ship returned to San Diego. Both within and outside the Grid, phalaropes were seen sitting on the water (but more so outside the Grid). Therefore, it is quite possible that many of these birds were missed in the Grid due to rough seas. Pomarine Jaeger (Stercorarius pomarinus) No. Obs.: 1 Only one light-phase bird was seen. It was recorded in the eastern part of Section S on 24 March.