JPM Myers 1974 Journal Tower, (117) region, Estancia Medaland, 35 Km S. of Sancho by road, Pto de Madariaga, Proia de Bs. Aires 22 October (cont'd) then back to the under-dispersed condition. Unfortunately the morning's observation period was too short to reveal whether the oscillations are truly cyclic, although the graph (see data book) certainly suggests it, with a period (if I can be permitted to call it that) of an hour from peak clumping to peak clumping. Unfortunately, the tape commentary color (it was to accompany the f(tin) plot disappeared beneath a linear grid reading. Hence, possible external factors influencing the change are unknown except for one definite speaking which occurred at 1045 on 17b. Here, the [illegible] shot up from 1.74 at 1050 to 4.9 at 1045. However, the buffle quickly dispersed to an over-dispersed value (0.87) at 1100. I examined the possibility that [illegible] was affected by the % of birds feeding but using a scatter diagram and eye-balling (the only possible here in the field) found no strong effect. It does appear that, except when spoken, [illegible] decreases with increasing density (using data from 10-21 and 10-22 and an eyeballed scatter diagram). In other words, if there are few birds (X < 0.4 birds/625m²) they are likely to be very clumped. However with larger groups the dispersion achieves a more even effect. For this there are many possible explanations. However, in order to understand the temporal process involved I must take exclusive qualitative info. on the events in the area (grid + surrounds), take grid data over smaller time intervals (is it possible?) and supplement the material with qualitative info. on feeding rates, aggregation rates etc., doing the falling and rising phases of the dispersion pattern. linear grid, Arroyo Chico, Estancia Medaland, Pto de Madariaga, Proia de Bs. Aires Aug. 23 October ran linear grid beginning at 0905, few birds - total. Calidris fuscicollis 17; Micropalama bimaculata 6; Tringa flavipes 3, Tringa maculosa 1, Chroadeus fullelandi 1, Himantopus mae, 2, Larus maculipennis 2, Aras georgica 2, Ayas flavirostris 1. Running back down total: Calidris fuscicollis 54, Calidris bartrici 2, Micropalama 15, Limosa haemastica 5, Tringa flavipes 6, Phylaidis dominica 1, Chroadeus fullelandi 21, Himantopus 6-15, Larus maculipennis 1, Steganopus tricolor 1, Sterna hirundo 2, Aras georgica 7, Ayas flavirostris 10. 3 banded white rampa from last year plus 1 WR and 1 falcklanders from this year.