제주연안 큰열매모자반의 생장과 성숙패턴 분석을 위한 생식배분 지수의 적용
Application of reproductive allocation index to the analysis of growth and maturation patterns of Sargassum macrocarpum C. Agardh in Jeju Island, Korea
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초록
큰열매모자반은 제주도 연안 생태계에서 수관층을 형성하는 중요한 다년생 갈조류이다. 이 연구는 2018년 5월부터 2019년 6월까지 제주연안에서 큰열매모자반 개체군의 생장 및 생식패턴을 밝히기 위하여 수행되었다. 큰열매모자반 개체군의 정량조사를 통해 월별 형질분석, 밀도 및 현존량 분석을 실시하였다. 또한 큰열매모자반의 생식자원 배분 특성을 조사하기 위하여 전체 엽체길이 및 엽중량에 대한 생식엽길이와 중량비율을 측정하였다. 조사지역에서 큰열매모자반의 최대 엽장은 6월에 135.3±20.0 cm, 최대 엽중량은 5월에 평균 3.6±2.1 kg·wet-wt., 평균밀도는 4.5 individuals·m-2 및 평균현존량은 4.6 kg·wet-wt.·m-2였다. 생식기탁의 형성은 4~8월 (수온 16.1~25.0°C)까지 관찰되었으며, 난 방출 시기는 6~7월 (수온 19.3~22.9°C)이었다. 엽체의 발달은 수온 14.1°C 이상의 조건에서 이루어졌으며, 성숙에 요구되는 유효 적산온도는 726.3 degreedays였다. 큰열매모자반의 생식배분은 6월에 최대 69.3%로 나타났다. 큰열매모자반의 생장과 성숙패턴은 생장기(10~1월), 생식시작기 (2~4월), 성숙기 (5~6월), 난 방출기 (6~7월) 및 휴지기 (8~9월)로 구분되었다.
Abstract
The ecological characteristics of Sargassum macrocarpum, an ecologically and commercially valuable brown alga, were investigated from May 2018 to June 2019 in Jeju Island, Korea. The S. macrocarpum population formed patches at depths of 3-5 m. Growth in the length of the alga reached a maximum of 135.3±20.0 cm in June. The weight of the alga reached a maximum of 3.6±2.1 kg·wet-wt in May. The mean density and biomass of S. macrocarpum was 4.5 individuals·m-2 and 4.6 kg·wet-wt.·m-2 in their habitat. Receptacles were observed from April to August and egg release was detected from June to July when the seawater temperatures were 19.3-22.9°C. The developmental initiation of thalli occurred at temperatures above 14.1°C and maturation required approximately 726.3 degree-days. The reproductive allocation of this alga, calculated from the reproductive frond length (RFL) and reproductive frond weight (RFW) indices to the whole length and weight, reached a maximum of 69.3% in June. The growth and maturation patterns of S. macrocarpum could be divided into vegetative growth (October-January), maturity preparation (February-April), maturation (May-June), egg release (June-July), and resting period (August-September). This was the first study to examine an S. macrocarpum population throughout the entire year in a natural habitat in Jeju Island, Korea.
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