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RISS 인기검색어
- 검색키워드
- 저자 : Masao Ohno (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Early Stage of Algae Succession on Artificial Reefs at Muronohana , Ikata , Japan
Ohno, Masao,Sohn, Chul Hyun,Choi, Chang Geun,Takayama, Hiroshi,Segawa, Shigeru 한국수산학회 2000 Fisheries and Aquatic Sciences Vol.3 No.1
Different substrata fixed as the roof (for shadow) on artificial iron reef had been developed as a tool for valuable fishery resources. The experiment was set up on a sandy bottom substratum at 8m depth in Muronohana, Ikata, Japan. Within one month of placement of the plates, diatoms dominated the experimental plates with a coverage of 100% approximately. Enteromorpha intestinalis and Colpomenia sinuosa dominated within three months after the placement. E. intestinalis coverage on substrata was estimated 7% on the plate shaped iron bar, 12∼14% on concrete plates, 18% on the plate fixed pebble, 61% on the plate to accumulated wood, and 80∼100% on the steel materials plate. Whereas after four months of placement, C. sinuosa coverage on plates became 1∼36% on different plates, and 100% on the plate to accumulated wood. The differences in E. intestinalis and C. sinuosa colonization on the different substrata were probably due to variations in their surface roughness influencing the settlement of zoospores, and thus gametophyte development. After five months of placement, the above two species slowly disappeared.
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Laboratory, Field and Deep Seawater Culture of Eucheuma serra-a High Lectin Yielding Red Alga
Dinabandhu Sahoo,Masao Ohno,Masanori Hiraoka The Korean Society of Phycology 2002 ALGAE Vol.17 No.2
The red seaweed Eucheuma serra is a high yielding source of lectins. The plants were collected from a depth of 5-6 meters and cultured in the laboratory, field and deep seawater. A Daily Growht Rate (DGR) of 3.5% was observed at 18℃ with a low light of 30μmol photon $ m^{-2} · s^{_1}$ in the laboratory. When the plants were cultured in the field at different depths during winter onths of December and January, best growth was observed at 1 m depth and a DGR of 2.14±0.04% was recorded. The plants grown in the tank with a continuous supply of deep seawater showed a DGR of 8.2% The results indicate that E. serra can be cultivated in large scale both in deep seawater in the tank and in the field for the extraction of lectins at a commercial scale.
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Seaweed Succession on Artificial Reefs Placed in Different Depths at Ikata, Japan
Choi, Chang Geun,Ohno, Masao,Sohn, Chul Hyun 한국수산학회 2002 Fisheries and Aquatic Sciences Vol.5 No.4
Aritificial reefs were set on a sandy bottom substratum at 8 m, 10 m and 13m depths along the coast in Muronohana, Ikata, Japan. Succession of seaweed communities was observed monthly or bimonthly from February 1999 to August 2000 on artificial reefs. Within one month, the diatom colonized on the reefs with coverage of 100%. After three months, Enteromorpha intestinalis and Colpomenia sinuosa dominated on the reef in the spring. Seaweed flora decreased during the summer and the dominant species were several species of Melobesioidea. In the winter, the seaweeds grew up again and the dominant species on the each reef were Sargassum spp., Ecklonia Kurome and Padina arborescens after one year. The dominant species in the algal succession process changed from diatoms to the perennial seaweeds such as Sargassum spp., E. kurome and P. arborescens. Thus, the pattern of succession of the dominant species and the degree of domination were changed by the season, water depth and the recruitment of spores and eggs from the mature alga around the reefs.
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Early Stage of Algal Succession on Artificial Reefs at Muronohana, Ikata, Japan
Choi Chang Geun,Takayama Hiroshi,Segawa Shigeru,Ohno Masao,Sohn Chul Hyun The Korean Society of Fisheries and Aquatic Scienc 2000 Fisheries and Aquatic Sciences Vol.3 No.1
Different substrata fixed as the roof (for shadow) on artificial iron reef had been developed as a tool for valuable fishery resources. The experiment was set up on a sandy bottom substratum at 8m depth in Muronohana, Ikata, Japan. Within one month of placement of the plates, diatoms dominated the experimental plates with a coverage of $100\%$ approximately. Enteromorpha intestinalis and Colpomenia sinuosa dominated within three months after the placement. E. intestinalis coverage on substrata was estimated $7\%$ on the plate shaped iron bar, $12-14\%$ on concrete plates, $18\%$ on the plate fixed pebble, $61\%$ on the plate to accumulated wood, and 80-100% on the steel materials plate. Whereas after four months of placement, C. sinuosa coverage on plates became $1-36\%$ on different plates, and $100\%$ on the plate to accumulated wood. The differences in E. intestinalis and C. sinuosa colonization on the different substrata were probably due to variations in their surface roughness influencing the settlement of zoospores, and thus gametophyte. development. After five months of placement, the above two species slowly disappeared.
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Algal Succession on Different Substrata Covering the Artificial Iron Reef atIkata in Shikoku, Japan
최창근,손철현,Choi, Chang-Geun,Ohno, Masao,Sohn, Chul-Hyun The Korean Society of Phycology 2006 ALGAE Vol.21 No.3
Succession of artificial seaweed communities in an artificial iron reef at Ikata, southern Japan was studied based on monthly or bimonthly observations from February 1999 to August 2000. Communities were associated with different substrata (40 cm x 60 cm: steel, concrete, wood and stone) as the cover on artificial iron reefs (4.5 m x 4.1 m x 2.5 m, 45.38 m3 and 3.2 ton), which were placed on a sandy substratum at 8 m depth. Within one month diatoms dominated on all substrata with cover of approximately 100%. Enteromorpha intestinalis and Colpomenia sinuosa dominated on the reef within three months after the placement in the spring. Seaweed communities on the reef decreased during the summer. In the winter, the seaweeds on the reef recovered. Sargassum spp., Ecklonia kurome and Padina arborescens dominated on each substratum after one year. Seaweed communities on the artificial reef were similar to those on the rocky substratum around the artificial reef and also similar on different substrata covering the iron artificial reef. These results indicate that seaweed succession was impacted by season and the recruitment of spores and propagules from mature algae around the artificial reefs.
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