J.P. Myers 1974 Journal Lincangrid Subunit 3, Arroyo Chico, (11,16) Estancia Medaland, 35 Km S. of Juancho lay road, Ptdo. de Madariaga, Provincia de Bs. Aires, Argentina 25 November (cont'd) That the influx has occurred within the last 24-36 hours. The behaviour thus birds present also suggest, strongly, a non-climax situation. Territories were being established (except 11-25-74A's - which were quite large), and boundaries marked did not have the fixity which we have found in other places. Further, the actions of the intermediate birds, and the fact that there was a steady decline in numbers suggested that the array was still evolving here. But this is stretching our knowledge of this particular unit too much. During the afternoon we made the requisite habitat measurements. Sky remained 0% clouds, the wind continued strongly out of the WNW, and temperature rose to 25°C. However, at 13:20 there was a dramatic shift in the wind to a S direction, a wind that by the smell of it (or our sardine lunch) had been on the sea. The air took on the appearance of one above the Big Sur Mtns just after the fog's been burned off. And the temperature dropped 6°C. As a result of the wind, in the next 2 hours water heights rose ~1 cm, causing up to 20cm horizontal expansion. This did not, however, effect the habitat stability measure, which showed 0% change at and before 1900. 27 November We spent the entire morning out along the upper regions of Arroyo Chico, taking microhabitat points on Lainosa, Micopalamo, and a few others. The array continues on its drying way - retracting to a series of disconnected paddies which themselves are long, narrow, and quintessential WR habitat. They abound, and many are showing space-specific aggregation. I collected 3 territorial WR this morning (178, 180 and 181), as well as one of unknown status (179) which was in a flock with 180 and 181. Three 3 were within RPR P-1-g A, a new resighting for returned WR (see WR sp. accent re activities of that particular flock). Weather during the morning was cool with intermittent bursts of heavy rain, precipitating from cumulus coming out of the S. Typical of weather we had here last spring.