Vztah mezi škálováním diverzity a počtem jedinců ve společenstvu

Dlouhá, Hana

The patterns connected with increasing number of species while enlarging studied area (species-area relationship, SAR) remained one of the most studied topics in ecology. In the past, papers presenting single SAR curves prevailed. Recently, also unifying works have appeared. One approach has focused on the possible relationship between mean number of individuals per species and the rate of increase of number of species with area. According to this theory higher mean species abundance leads to lower values of SAR curve slope. Moreover, there is one prediction based on maximization of entropy principle (MaxEnt) that is able to give us particular values of SAR's slope when we provide the values of mean species abundance. There are also other approaches except for MaxEnt one that deals with mean species abundance and reached similar results. The main aim of this work was to gather all possible data about slopes of SARs and mean species abundances and find out possible relationships between these two variables. I have also included several other variables into the analyses to reveal the importance of them as predictors for the values of the slope. I performed two main groups of analyses. At first I focused on overall slopes of SAR curve (overall slope represents the slope of a line that resulted from...

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