모자반(Sargassum fulvellum)의 생장, 성숙과 발생
Growth, Maturation and Development of Sargassum fulvellum (Sargassaceae, Phaeophyta)
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Abstract
Sargassum fulvellum (Turner) C. Agardh, an edible brown alga is farmed commercially by sexual reproduction and vegetative regeneration. Investigations were made on the phenology, abundance and maturity of reproductive structures in mature fronds, egg release and young germling development under different light conditions (20, 50, 80 and 100μmol/m2/s) and temperatures (5, 10, 15, 20 and 25℃). Monthly sampling was carried out by SCUBA diving at Chungsando on the southwestern coast of Korea from September 2002 to August 2003. The Maximum length of thalli was 104.6±20.7cm in March 2003 when the water temperature was 9.0℃ and minimum was 0.8±0.5cm in June when the water temperature was 19.5℃. Receptacle formation was observed from February to April. The peak period of egg release for this alga was in April when the water temperature was about 10℃ in nature. In the culture regimes of temperature and irradiance, the egg release of the excised female receptacle was highly affected by temperature. The maximum rate of egg release was 96.7±5.8% under 20℃ and 80μmol/m2/s. The maximum length of young germlings was 3.9±0.2mm after 35days culture under 15℃ and 80μmol/m2/s.
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