@misc{Ulrich_Werner_Estimating_2001,
 author={Ulrich, Werner},
 editor={Polish Academy of Sciences. Institute of Ecology},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Dziekanów Leśny},
 howpublished={online},
 year={2001},
 language={eng},
 abstract={This paper evaluates the accuracy any estimator of species numbers may achieve if only a limited fraction (up to 3/4) of the species number in the community has been sampled. From the impossibility to infer the relative abundance distribution (RAD) the rare and not sampled species follow it is shown that it is only possible to give a lower and an upper boundary of the species number. The lower boundary may be inferred either from a fit of a log-normal type RAD or by a graphical method. In the latter case, the lower boundary is Smin = (ln (dmin) - 2 icpt) / slope with dmin being the minimal possible relative density in the community and icpt and slope being the intercept and the slope of the geometric series fitted through the linear part of the log-normal distribution. The upper boundary is found through an extrapolation of this geometric series up to dmin [Smax = (ln (dmin) - icpt) / slope]. For any estimator to work dmin has to be known.},
 title={Estimating species numbers by extrapolation: a cautionary note},
 type={Text},
 URL={http://www.rcin.org.pl/Content/115830/PDF/WA058_91423_P2840-T49_Eko-Pol-A-Nr-3.pdf},
 volume={49},
 number={3},
 journal={Polish Journal of Ecology},
 publisher={Polish Academy of Sciences. Institute of Ecology. Publishing Office},
 keywords={species numbers, extrapolation, species accumulation curve, relative abundance distributions, power fraction, jackknife-estimator},
}