On the distribution of spores from the community of coralline algae. -Supplementary report.

Abstract

The distribution of coralline spores was surveyed in relation to the situation of mother communities in Nabeta Bay. The communities dominated by Amphiroa ephedraea lay at about 3 m of depth in two rows along east and west sides of the bay. Spores were trapped by means of submerged slides regularly placed at various depths and distances from the mother community. When counted after 9 days, on the west side community, frequency of spores decreased, as a general rule, according to the distance from the community either in vertical or horizontal directions. But the details of variance, shown in Fig. 2 as an isogram, indicated that the decrease towards the sea level was steep just above the community, while it was more gradual at distant places showing the frequency maxima at the depths nearer to the surface. A survey of the whole area after 7 days, shown in Fig. 3,indicated that the frequency was greater at the surface than the bottom near the entrance of the bay. The variance was rather irregular on the east side as compared with the west side due to complexity of the community formation. The spore counted was zero at several points in the middle of the bay.