The use of replicated plot, line and point sampling for estimating species abundance and ecological diversity

摘要: The paper deals with the problem of estimating diversity indexes for an ecological community. First species abundances are unbiasedly and consistently estimated using designs based on n random independent selections plots, points or lines over study area. sampling elusive populations is also considered. Finally, index estimates obtained as functions abundance estimates. resulting estimators turn out to be asymptotically (n large) unbiased, even if a considerable bias may occur small n. Accordingly, method jackknifing made use in order reduce bias.