Productivity of a Sargassum macrocarpum (Fucales, Phaeophyta) population in Fukawa Bay, Sea of Japan.

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  • Productivity of a Sargassum macrocarpum(Fucales, Phaeophyta)population in Fukuoka Bay, Sea of Japan
  • Productivity of Sargassum macrocarpum (Fucales, Phaeophyta) population in Fukawa Bay, Sea of Japan

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Abstract

The productive structure and productivity of a Sargassum macrocarpum C. Agardh population were studied from June 1993 to July 1994 in Fukawa Bay facing the Sea of Japan, Yamaguchi Prefecture. S. macrocarpum formed a dense population at a depth of 8 m in the study area. Using the stratified clip technique, monthly changes in the productive structure from 1993 to 1994 were clarified. The dry weight of leaves and main branches increased with the elongation of branches. Thalli in the middle to high stratum began to bear receptacles from March 1994 and the dry weight of receptacles was approximately one-third of the standing crop in June. The loss of leaves increased from April to June 1994, and the loss of main branches and receptacles from June to July 1994. Productivity of branches and receptacles reached maxima of 4.67 g dry wt/m2 per day from February to March and 5.33 g dry wt/m2 per day from April to May, respectively. Productivity of the leaves, however, was almost constant at approximately 2 g dry wt/m2 per day from July 1993 to March 1994. Therefore, maximum productivity of the S. macrocarpum population of 7.17 g dry wt/m2 per day occurred from February to March. Annual net production of newly sprouting branches in June 1993 was 1600.1 g dry wt/m2 per year based on the summation method, which was calculated from the monthly changes in the productive structure.

Journal

  • Fisheries science

    Fisheries science 66 (2), 270-277, 2000

    The Japanese Society of Fisheries Science

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