Species richness of tenebrionid beetles in Latium (Central Italy) estimated by various non parametric estimators for different measures of sampling efforts (number of years, number of decades, number of UTM 10×10 cells and number of collectors).

ACE: Abundance-based coverage estimator; ICE: Incidence-based coverage estimator; Chao 1: Abundance-based estimator of species richness; Chao 2: Incidence-based estimator of species richness; Jack 1: First-order jackknife richness estimator; Jack 2: Second-order jackknife richness estimator; Bootstrap: Bootstrap richness estimator; MMRuns: Michaelis–Menten nonparametric estimator with values averaged over randomizations; MMMeans: Michaelis-Menten richness estimator computed once for Mao Tau species accumulation curve; F3 Extrapolation nonparametric estimator 3; F5 Extrapolation nonparametric estimator 5.