Species Accumulation Curves and Similarity Traits of a species-rich Fly (Diptera) Community

摘要

Here we report some statistical properties of a sample of 92 680 flies collected in Hungarian pastures between 2002 and 2005. We applied descriptive statistical methods, incl. species accumulation curves to describe the relationship between species number and sample effort. Although these curves show an essential slowing down of the increase in the number of fly species, they do not appear to have reached saturation. We discuss the importance of the specification of the sampling effort. To analyse variability conditions of the species structure of the sub-collections, we applied the normalised version of the "expected species shared" parametric similarity indices. We applied these indices with significantly different parameter values. As known, the parameter influences the sensitivity to changes in small species abundances. The similarity between sub-collections is lower for sub-collections originate from different collection years. With a higher index parameter value the index indicates larger variability in the species structure of the sub-collections. Ignoring advanced ecological reasoning, we offer reference data regarding quantitative traits of other Diptera statistics.