小浜湾におけるヤナギモクの主枝の生長〔英文〕
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概要
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The growth in Iength and weight of primary laterals in Sargassum rlnggoldianum Harv. subsp. coreanum (J. Ag.) Yoshida (Sargassaceae, Phaeophyceae) growing in Obama Bay, a branch bay of Wakasa Bay located in the middle part of Honshu facing the Japan Sea was studied on the basis of materials collected from October 1981 to October 1982. The number of primary laterals and scars on each branch of stem was counted and it was found that their number changed with the age of the plant. In stem V plant the stem I had an average of 4.5 leaves and 4.5 primary laterals, stem II with 6.6, stem III with 4.9, stem IV with 4.4 and stem V with 3.2. Among several primary laterals arising on each branch of stem, one to three of them grew to elongate longer than the others and in autumn they produced receptacles to maturity, falling from their stem branches. In September, they attained their maximum length and weight and with an average of 64.3cm (range: 29-100cm) and 11.7g (range: 1.8-42.0g), respectively. Mean weight of longer primary laterals on each branch of stem was: stem I1 0.9g, stem I2 5.54g, stem II 7.4g, stem III 5.36g, stem IV 4.36g, and stem V 2.0g. Shorter primary laterals 0-10cm long were found produced on stem throughout a year and their frequency to the total number of primary laterals was (11.1) 30.5-71.4 (85.7)%. From July to October, some primary laterals attained a height of 70-100 (110)cm and their frequency to the total number was (0.1)1.1-20.0(33.3)%. An annual produc-tion of primary laterals on stem III plant was estimated to be 83.56g (d.w.).