J.P. Nippers 1994 Journal Linear grid, Arroyo Chico, Estancia Medland, 35 km S. of Tornichely road, Pto. de Madariaga, Provincia de Bs. As., Argentina Punta Raya. Everywhere along the Arroyo (i.e. at any point), could be found appropriate w/r habitat, although some of it - the newly exposed areas - was apparently better than others. And 4 hours after the morning grid count there was still a large flock (in fact larger than it had been) on subunit 1. Thus the instability was small in comparison to a tidal mudflat where the location of a minimum foraging point might shift several hundred meters on an outgoing tide. If for a moment, we consider the dispersion of the habitat, it would appear intuitively obvious that the 'damned' areas represented patches of extremely favourable habitat, and thus I suspect that was a measure of the dispersion of optimal w/r habitat along the arroyo available. It would reflect an otherwise rare under-dispersed pattern relative to flat which it usually is. For the w/r sample this morning was 34. This compares with values of ~1.7 for the last 2 samples. There we were very patchily distributed, as was their habitat. However there was considerable space-specific aggression, and a degree of instability (but not 'successive'). [illegible] [illegible] I must say that my first reaction to this morning's dispersion - before looking at the bird's behaviour - was that the crowd had broken down the territorial system. That it did, if one limits the 'territorial system' to that precise dispersion of focal on 3 November, i.e. the same set of territories. But the birds were obviously at work at defining new territories in the new areas. [Note - muddy banks preceded me from running down.] Grid (14) (A013). Arroyo Chico, Estancia Medland, 35 km S. of Tornichely road, Pto. de Madariaga, Provincia de Bs. As., Argentina. 1600 drove from camp out to the curve area and stopped at the observation point for grid 14. The change in habitat between this morning and now is striking: this morning their ha (been) one of the 'damned' sites, within the water blown off of it to the north. Although the wind still contin- ues calculated, water has covered the area which this morning was prime habitat. What happened was that the 'dam' gave way on at least the water below the dam reached such a high level that the area was flooded and the water made it past the damned site. When we arrived at 16:20 there were still over 100 birds in the immediate area but instead of staying (and) being on the newly flooded bottom they were lining the sides, spread from grid 12 (below grid 14) to well above # subunit 1 of the linear grid. Amazing. And their space-specific behavior continues. Among