著者

吉田 司 芝 修一 前川 行幸 阿部 真比古 鈴木 輝明 高倍 昭洋

出版者

日本水産工学会

雑誌

水産工学 (ISSN:09167617)

巻号頁・発行日

vol.42, no.3, pp.239-244, 2006-02-20

被引用文献数

1

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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(1.5〜7.6mgO_2 gd.w.^<-1> h^<-1>). Dark respiratory rate of Z. marina was between 0.4 and S.SmgO_2 gd.w.^<-1> h^<-1>, I_k values and compensation points ranged from 88 to 129μmol m^<-2> s^<-1> and from 13 to 111 μmol 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.

著者

吉田 司 芝 修一 小山 義明 新井 義昭 鈴木 輝明

出版者

日本水産工学会

雑誌

水産工学 (ISSN:09167617)

巻号頁・発行日

vol.40, no.3, pp.205-210, 2004-02-27

参考文献数

9

被引用文献数

2

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Seasonal changes of Zostera marina L and physical environment factors (underwater irradiance, Sandybottom quality etc.) were examined off Miya in the Mikawa Bay, Aichi Prefecture, from 2000 to 2001 Japan.Z. marina forming seagrass beds grew densely from February to June, and declined from July to October.While a large number of juveniles geiminated from their seed started to appear toward the middle ofOctober, and Z. marina grew densely again in the following spring. Most of the Z. marina off Miya was annual.Vertical distribution range of Z. marina beds were from D.L. +0.5m to -1.6m depth. From the site irradianceconditions in the seagrass bed, the deepest bottom of Z. marina possible growth was estimated to beD.L.-1.8m. The high temperature in the summer was the important cause that the Z. marina beds weredecreased. Surface layer of the bottom was reductive conditions enough to germinate. These observationssuggest that Z. marina of annual plant requires calm environmental conditions as one of the required suitableconditions for successful seagrass bed formation.