Regional taxonomy

The effects of subjective decisions, particularly in the case of regional taxonomic methodology are often underestimated. Therefore the aptitude of alternative methods needs more careful evaluation. Comparisons of competing methods would provide important guidelines. A general evaluative approach based upon the discrepancy between the original resemblance and the derived cophenetic matrix is outlined for the hierarchic regional taxonomic case. Five main aggregative linkage strategies are appraised by means of quantitative measures. Furthermore two iterative non-hierarchic methods are compared for handling non-hierarchic regional taxonomic problems, where particular attention is paid to the influence of different initial partitions upon the (sub) optimal result.