小樽コンプ礁の植生構造と現存量

概要

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The algal vegetation of the Laminaria-bed was grouped into 4 communities, viz. Laminaria religlosa community, Ulva pertusa community, Laurencia sp. community, and Pachymeniopsis yendoi community. Each representative species of these 4 communities had high indicator values and Z^3 values. In the standing crop of all the algae of each community, surveyed in mid-June, the maximum (3403 g/m^2) appeared in the L. religiosa community and the minimum (403 g/m^2) appeared in the P. yendoi community. Although the mean standing crop of L. religiosa was 1195 g/m^2 in the area surveyed, it was 2926 g/m^2 in the L. religiosa community, about 300 g/m^2 in the U. pertusa and the Laurencia sp. community, and 87 g/m^2 in the P. yendoi community. The mean density of L. religiosa in the area surveyed was 48/m^2,and it was 108/m^2 in the L. religlosa community. The other communities had lower densities of less than 20/m^2. The mean blade length of L. religiosa was 44.2 cm in the area surveyed, and the maximum blade was 240 cm in the L. religlosa community in which mean blade length was 74.5 cm. In the other communities, the mean blade length was less than half of that in the L. religiosa community.
1977-03-31