JPMayers 1973 Journal Tower Llanos and Arroyo Chico, Estancia Medland, 35 Km S of Juancho by road, Pcia. dt B.A., Arg. 12 December cont'd stakes have cattle lain on them, some are knocked down, etc. Also the guy wiring for the Tower are well used, and many are quite loose. One serious question, if indeed the cattle are now attracted to the area, or what effect their increased presence will have on the buffalos and golden usage of the grid area. From the tower we drove breakout to the road, across Arroyo Chico, and then off the road, back to a point on the Arroyo immediately across the Arroyo from the tower. On the way we passed through a series of fields rippled with golden and traffics, more or less I had seen in these areas previously (23, 24 November). More water was present in isolated puddles, although there was not as much surface area covered as in the Tower Llanos, the fields also had a more ragged appearance, with many short (6") weeds protruding above the short-grass base. Several flochs of pectorals spotted, as well as a few WR. We gridded the Arroyo shoreline for 275 m (1 stake / 5m) across from the tower. WR were concentrated on the shore in an area well trampled by cattle, in the vicinity of stakes 50-55. I noted definite differences in the bottom consistency while driving stakes: the area near 50-55 became less sandy, and more muddy, than those areas farther to the S. When we finished this grid, it appeared likely that there would be more rain. The morning N wind was shifting toward the W, and low clouds filling the sky, some quite dark. Returned to farmhouse for stakes (a few crops fell), and then back to Tower Llanos for more gridding: Grid 6, S of tower, with a grid 75 x 100 m, with 25x25 m units, i.e. 3 units x 4 units. We decided to try units this large in order to make it possible to cover more area. We then drove W along the Arroyo in order to begin placing the WR transect: 100 m gridded by 1 stake / 5 m, with intervals between grids of 200 m. 10 grids in total. On the way upstream we came to a slightly lower area on the Llanos, about 300 m from the tower, which was full of shovelwires. The "lowland" was ~ 95 x 100 m, very bumpy (small shallow depressions, 6"-1' across with many 3"-4" mounds alternating with the depressions with many of the depressions water-filled). Pectorals and WR, and a few buffalos were in this area. The bumpy depression ended abruptly and became a smooth expanse of short-grass Llanos, continuous with the Tower Llanos. Many Griffs and golden foraging deer (i.e. >20 buffalos). In this small area the separation between upland and lowland species was fairly clear-cut.