J.P. Myers 1973 Journal Grid 1 (Farmhouse Puddle), Estancia Medeland, 35 Km S of Juanchoy, rong Ria de Bs. Aires, Argentina 26 December cont'd is much more similar to that of 12/24. Overshadowing the grid on my arrival was a flock of 24 Microplasma foraging. The majority stayed throughout my observations. There also appeared to be fewer Pectorals and LYL. During the afternoon (I stayed until 1600) the rain stopped briefly to start again just before I left, and the wind picked up from moderate to strong. Temperature remained around 20°C. 19 samples. Totals (sp, ave, range, tki) Pectoral 3.4 (2-5) 65, Whirrump 3.7 (0-6) 73, Microplasma 24 (17-28) 454, LYL Legs 2.4 (0-6) 44, GYL Legs 0.2 (0-3) 4; Wilson's Phalarope 0.9 (0-2) 17; (L-Plover - (0-1) 1; Speckled teal 0.3 (0-1) 5 ; (Corvusornum Pipit - (0-1) 1. Lapwings were present during the afternoon, apparently, but their activities appeared to be dispersed, the center of their activity are off the grid. However, the lower right hand corner of the grid ((low (4,n), (3,n))) they are chasing, especially during the latter part of the observation period. They are definitely clearing from (4,0) and are occasional from (5,0) (2,-1). But not as regularly as in previous observation periods. 27 December On grid at 0600, but took no sample because of constant disturbance. Returned ~ 1 hour, during which I saw several SC attacks and a number of territorial interacting including one prolonged Pectoral flight (see ap. accent for Pectoral). Back at 1125, took first reading at 1195. Temp 27°C. Lapwings decided in 48 (0-1) count. and the SC had been aggregating in the grid first 20 min all the way across the lower part of the grid - this is the dominant feature of the grid this afternoon - zero aggression throughout the first part of the observation ranging over most of the lower half of the grid. Four of 21 samples must be considered zero disturbed. In addition, it is apparent from the 15 hour of 5 minute sampling intervals (1600-1700) that, if the Lapwings disturbance is persistent enough, the effects take a considerable time to decay. It may be that all of the 5 min hour samples are thus affected, though I labeled only those occurring falling within one minute as two disturbed. Two other significant features of the data are the presence of non-torerial pectorals in some of the samples (see ap accent) and a solitary Microplasma which remained most of the afternoon. Totals: Pectoral 4 (2-7) 86 Whirrump 3 (1-4) 61, Microplasma 0.9 (0-1) 8; GYL - (0-1) 1, LYL 1 (0-1) 20