. The Canadian field-naturalist. 54 The Canadian Field-Naturalist Vol. 102 30 1 20 - 10 - o o UJ DC FlGU 30 1 20 10 40 30 20 10 -\ B A 10 6 H 2 10 I— LU < 6 - Q 11 10 20 30 40 AGE (YRS) RE 3. Population age structure for Aralia nudicau- lis in three successionally related plant communi- ties: A) Stand 2; B) Stand 3; C) Stand 4 of Strong and La Roi (1983). N = 20 for each stand. s^T\ n n 6 -. T 1 1 1 r 600 1200 SIZE (PI NF n n 1800 r 2400 Figure 4. Frequency distribution of Perfor- mance Index in female, male and non-flowering shoots of Aralia nudicaulis in 1983. Measure- ments were made on
. The Canadian field-naturalist. 54 The Canadian Field-Naturalist Vol. 102 30 1 20 - 10 - o o UJ DC FlGU 30 1 20 10 40 30 20 10 -\ B A 10 6 H 2 10 I— LU < 6 - Q 11 10 20 30 40 AGE (YRS) RE 3. Population age structure for Aralia nudicau- lis in three successionally related plant communi- ties: A) Stand 2; B) Stand 3; C) Stand 4 of Strong and La Roi (1983). N = 20 for each stand. s^T\ n n 6 -. T 1 1 1 r 600 1200 SIZE (PI NF n n 1800 r 2400 Figure 4. Frequency distribution of Perfor- mance Index in female, male and non-flowering shoots of Aralia nudicaulis in 1983. Measure- ments were made on plants in reference stand #3 of Strong and La Roi (1983). Performance Index is defined in Table 3. In shaded habitats A. nudicaulis produces smaller leaflets than in open areas. In extremely shaded habitats not only is leaflet size reduced but leaflet number is also reduced (Table 4). (d) Growth and turnover rates: Male-biased floral sex ratios have been reported for several natural populations of ^. nudicaulis in'New Brunswick and Massachusetts (Barrett and Helenurm 1981; Bawaet al. 1982). The male-biased floral sex ratio results from differences in the frequency of flowering between the two sexes (Table 5). Of the Alberta ramets marked in 1983, only of the females flowered again in 1984, while of the males flowered again in 1984. Similar differences between the sexes in consecutive flowering pattern were observed in 1984-85, but higher percentages of both male and female ramets flowered in 1985. Approximately 10% of the flowering ramets marked in one season produced no leaf the following Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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