species accmulation curves of the obseved (continuous lines)and estimated (Jackknife 2, broken lines) sprcies ridhness for esch type of rubber plantation. Curves are plotted from the means of 50 randomisations of the sample accumlation order. 3a, arboreal ant samplings;3b, ground ant samplings. (Note the estimated richness of zero at one sample is an artefact of the Jackknife method)