Carbon and nitrogen contents of seaweeds in Hiroshima Bay, the Seto Inland Sea [Japan]
2001
Yoshida, G. (National Research Inst. of Fisheries and Environment of Inland Sea, Ohno, Hiroshima (Japan)) | Uchimura, M. | Yoshikawa, K. | Terawaki, T.
Carbon and nitrogen contents were surveyed for 22 seaweed species in Hiroshima Bay, the Seto Inland Sea. Especially, the contents of some species of large brown algae, which are the main constituents of seaweed beds in the Bay, were investigated in relation to the variation among parts of the plant body and the seasons. The contents for Ecklonia kurome were C: 27.7 - 37.3% dry weight (DW), N: 0.88 - 2.44% DW, Sargassum macrocarpum C: 22.7 - 44.0%, N: 1.38 - 3.50%, Sargassum horneri C: 26.7 - 36.3%, N: 0.71 - 3.76%, Hizikia fusiformis C: 26.8 - 35.1%, N: 1.14 - 4.20%, Undaria pinnatifida C: 25.3 - 34.7%, N: 2.62 - 5.69%. It is concluded that the carbon contents in the total plant bodies accounts for 30 - 35% of the dry weight for Phaeophyta, 25 - 30% for Chlorophyta and 30 - 35% for Rhodophyta except for collaline algae. Most nitrogen contents accounts for 1 - 3% of the dry weight, but the values were so variable as to cause a marked variation in the C:N ratio (4.82 - 48.3) among these species and the seasons.
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