Acetylene reducing activity at a tropical seagrass bed in Papua New Guinea |
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Authors: | Hitoshi Iizumi |
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Affiliation: | (1) Otsuchi Marine Research Center, Ocean Research Institute, University of Tokyo, Akahama, 028-11 Otsuchi, Iwate, Japan;(2) Present address: Hokkaido National Fisheries Research Institute, Katsurakoi 116, 085 Kushiro, Hokkaido, Japan |
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Abstract: | Acetylene reduction activity at a tropical seagrass bed in Papua New Guinea was studied. Blades of every species of seagrass studied (Enhalus acoroides, Thalassia hemprichii, Halodule uninervis, Syringodium isoetifolium) at the bed showed active acetylene reduction in the rage of 0.025–0.050 mol cm–2d–1. It is suggested that epiphytic blue-green algae would be responsible for active acetylene reduction. Acetylene reducing activity was observed also at rhizosphere of seagrasses, microbial communities on the detritus and periphyton on snail shells. It is estimated that total nitrogen fixed at the seagrass bed will be equivalent to 6.7% of that required for the growth of seagrasses. |
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