J.P. Myers 1974 Journal Grid 14, Arroyo Chico, Estancia Medeland, 35 km S. of Tucumcara by road, Pto de Malargüe, 300 m b.s. This day this means that the % value may be slightly low. It also reveals difference in degree of spare-specificity between them and RobrB, which remained on their territories throughout- even when all the rest of the flock specked and flew. Incidentally, I think it significant that RobrB and other birds were territorial this morning on the grid, and that the density is lower (+ territories much larger). The habitat looked much larger than it was last night - when RobrB and others were territorial. Time produces an expansion of territory and a reduction in density. Or vice-versa. Or both. ?? See we spp. accent or observations. During the afternoon we took habitat data and (dispersion of micro-habitat of wemyps) and continued to measure the stability of the habitat as we'd begun the morning. During the day the periphery of the water gradually dried and the shore line considerably receded. Barely in most places there was no more than 30 cm recession during the whole day, caused by a maximum water drop of 2 cm. 2 larger areas were uncovered and dried, but they are small with respect to the total available habitat ( < 5 m²). temporal stability plot will look something like this. 15 10 % change 5 0 start → 0800 1100 1400 1700 Admittedly a crude measure, it is generated by asking, for each one of the 30 5x5 m subunits, whether their flow is appropriate or habitat contained within at each of the sample times. Every sample % change is calculated by asking for each sample set what % of the units differ with respect to the 'answer' (yes-no) first obtained during the starting time sample. Can you do any better? Habitat measurements were marred somewhat by the fact that it took us 5 hours (steady) to complete them. Thus there was some change. But I don't think that it altered appreciably the results.