Abstract:
The fit to log-normal distribution of species abundance of bird communities in fopr agroecosystems:
vegetable cultivation, slash and burn agriculture (<chenas), paddy cultivation & tea plantation, in the
Southern Province of Sri Lanka was analyzed. Point-scan line-transect technique (encounter survey) was
employed to estimate bird abundance. None of the distributions differed significantly from log-normal
distribution when data were transformed into octave scale of Preston. The dispersion of the log-normal
curves was between 2.29-2.70. Compared to predicted values, 69-93 per cent of species theoretically
present in the sample area. The analysis showed that log-normal curve is applicable for bird communities
in agroecosystems.