한국 서남해안 갈조류 패 (Ishige okamurae Yendo)의 생장과 성숙주기
Growth and maturation period of a brown alga, Ishige okamurae Yendo, in a habitat of southwestern coast of Korea
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패는 다양한 생리활성물질을 함유하고 있어 산업적 이용이 기대되는 해조류이다. 이 연구는 2023년 3월부터 2024년 2월까지 전라남도 신안군 압해읍 장감리 조간대 암반 지역에서 패 개체군을 대상으로 월별 생장, 형태분석, 밀도 및 현존량 분석 등 정량조사를 실시하였다. 조사지역에서 패의 최대엽장은 10월 (수온 19.9°C)에 7.55± 1.39 cm, 평균 밀도는 4,466.6±288.9 ind. m-2 및 평균 현존량은 663.9±85.3 fresh-wt. m-2였다. 패 엽체의 성숙은 6월에서 11월 사이에 나타났으며, 단실포자낭은 6~11월, 다실포자낭은 7~9월에 형성되었다. 포자낭 성숙 최대 성기는 단실포자낭과 다실포자낭이 함께 출현하는 7~9월로 추정되었다. 패의 성숙에 요구되는 성숙유효적산온도는 단실포자낭이 평균 577.4 degree-days, 다실포자낭이 평균 801.4 degree-days였다.
Abstract
Ecological characteristics of the brown alga Ishige okamurae Yendo in its natural habitat at Janggam, Shinan on the southwestern coast of Korea were investigated from March 2023 to February 2024. The population of I. okamurae formed extensive patches along the shoreline. Environmental factors such as seawater temperature, pH, salinity, and dissolved oxygen were monitored during this study. Growth and maturation of the I. okamurae population were assessed using both qualitative and quantitative methods. This alga showed a peak growth in October when the seawater temperature was 19.9°C. It had a mean length of 7.6±1.4 cm, a mean density of 4,466.6±288.9 ind. m-2, and a mean biomass of 663.9±85.3 fresh-wt. m-2. The effective cumulative temperature required for the alga’s maturation was estimated based on growth data with a biological zero temperature of 9.2°C. Sporangia were observed from June to November when seawater temperatures ranged from 20.5°C to 14.0°C. Unilocular sporangia first appeared in June, followed by simultaneous appearance of unilocular sporangia and plurilocular sporangia from July to September. From October to November, only unilocular sporangia were observed. Thallus development began at temperatures above 9.2°C. Maturation required approximately 577 degree-days for unilocular sporangia and 801 degree-days for plurilocular sporangia.
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