Nippon Suisan Gakkaishi 66 (4), 651-657 (2000)

Adaptive Development of Tolerance to Wave-Induced Dislodgement for Cultured Laminaria japonica in Response to Water Movement

Shigeru Kawamata*

Transplant experiment was conducted to investigate the developmental tolerance to wave-induced dislodgement for Laminaria japonica in response to water movement. L. japonica plants cultured on long-line rope in a sheltered site were moved to a moderately exposed site monthly from February to May. Attachment strength for plants from the sheltered site increased linearly with the plant weight but was much lower than that for transplants with the same plant weight. The ratio of attachment strength to plant weight in late June showed a linear increase with the days of cultivation at the transplant site. Comparison of the frequency distribution of the root-mean-square water velocity at the transplant site with that at the sheltered site suggested that there might exist the velocity threshold of developmental tolerance to dislodgement, probably from 15 to 20 cm/s in rms value.


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