Final Conclusions

Abstract

The studied area comprising about 155,5 ha or 1.555.000 m² accomodates 67.777 individuals, trees (and shrubs) of a stem diameter not less than 10 cm at breast height. Individuals of species calculated for 1 ha occur at densities between 0,0064 up to 23,65 (e.g. Chaetocarpus schomburgkianus). Black, Dobzhansky, & Pavan (1950) who studied population densities in Amazonian forests give values of individuals per species between 0 and 16 per hectare. However, the population density of a half of the species is less than one individual per hectare. Comparing the above given data for 155,5 ha in Venezuelan Guiana, the category“less than one individual”goes down to 0,0064 individuals per ha which is less than 1/100 of an individual per ha. It thus results from this calculation that one hectare as sampling area is much too small for the evaluation of actual population densities and that a large amount of species and individuals is simply not covered in this way.