Fitting competing models of the population abundance distribution : land snails from Nikopol manganese ore basin Technosols

This paper examines the temporal dynamics of terrestrial mollusks of the Nikopol manganese ore basin technosols. The research was carried out at the Research Centre of the Dnipro Agrarian and Economic University in Pokrov (Ukraine). Sampling was carried out in 2012–2014 on four
variants of artificial soil: formed on red-brown clays, on loess-like loams, on gray-green clays,and on humus-rich layer. The distribution of the number of individuals in a mollusk population was described by broken stick, Motomura, log-normal, Zipf, and Zipf-Mandelbrot models. It was shown that the series of models that best describe mollusk abundance distribution is specific for a
particular species and technosols type and generally is invariant over time.
Key words: land snails, technosols, distribution, population.