Photosynthesis characteristics of Zostera marina L. at the coast of Miya in Mikawa Bay, Aichi perfecture, Japan
2006
Yoshida, T.(Chateau Marine Survey Co. Ltd., Osaka (Japan)) | Siba, S. | Maegawa, M. | Abe, M. | Suzuki, T. | Takabe, T.
Zostera marina L. form dense populations on shallow sandy and muddy bottoms in inner bay areas, and play important roles from ecological and fisheries points of view. In this study, photosynthesis characteristics of Z. marina were examined under several light intensity and the water temperature conditions, and the daily net production was estimated. Samples were collected from Miya in Mikawa Bay, Aichi Prefecture, Japan. Photosynthesis and dark respiration rates were measured under various light intensity and in situ temperature condition using a product meter and oxygen electrode system. Z. marina showed high light-saturated net photosynthetic rates (1.5-7.6mgO2 gd.w.-1 h-1). Dark respiratory rate of Z. marina was between 0.4 and 3.5mgO2 gd.w.-1 h-1, Ik values and compensation points ranged from 88 to 129 mu mol m-2 s-1 and from 13 to 111 mu mol m-2 s-1, respectively. Daily net production of Z. marina was estimated from the model equation of photosynthesis-light curve and the data on light intensity sampled in Zostera bed. High dark respiratory rate and low light intensity in the population lead to low net production, and result in withering and loss during the early summer season.
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