The results of measurements of 5780 acorns confirm that Quercus robur has acorns of langer size, as componed with acorns of Quercus petraea. Their length varied from 1.90 to 3.50 cm, with the average 2.71 cm, while in case of Q. petraea this characteristic varied from 1.60 to 3.50 cm, with the average 2.43 cm. The diameter of acorns was similar for both species. Dry mass of Q. robur acorns ranged from 1.054 to 4.937 g, on average 2.5924 g; in the case of Q. petraea it ranged from 0.835 to 4.796g, on average 1.8364 g. Taking into consideration the coefficient of variability of length and diameter, both species do not differ significantly. It ranged from 9 to 12%. In the case of dry mass the difference was larger and it was 23% and 28% for Q. robur and Q. petraea, respectively. The analysis of variance (F-test) showed, that the species taken as the source of variability influences significantly the length of acorns (in 17%) and dry mass (in 47%). Internal features determine these characteristics in 52% and 46%. F-test did not detect any dependence between oak species and the diameter of acorns.
The paper includes results of measurements of the length and diameter of 12600 acorns of Quercus robur and 5099 acorns of Q. petraea collected in Poland in the mast-year 1993. Acorns of both species were compared. Significant differences in acorn length and diameter/length ratio were found. Acorns of Q. robur are somewhat larger, but both species have a large common area of variability. The scale of this variability has been determined. Geographical correlation of the size of Q. robur acorns was ascertained.
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