DIPTEROUS ASSEMBLAGES OF SHEEP-RUN DROPPINGS - NUMBER OF SPECIES OBSERVED, ESTIMATED AND GENERATED BY SIMULATION

Four non-parametric methods are used to estimate species richness in s amples from dipterous assemblages on sheep-run droppings in Hungary. F urthermore, Hodkinsons' method has been modified to be applicable to s pecies richness extrapolations in any community in which the capture p robability of a given taxonomic group is significantly higher than tha t of the rest of the species. The expected species-individual diversit y (''rarefaction'') method has also been applied in a comparison of fi eld data (species numbers observed:) with estimates based on different frequency structures. Simulations by urn models, related to the trunc ated lognormal distribution, are proposed as an originally new method to generate species numbers from field data and its perspectives are e valuated by comparing the observed and the expected species-individual diversity estimates.