한국 동해안 주문진의 자연산 고리매 (Scytosiphon lomentaria)의 생장과 성숙주기
Growth and maturation period of a brown alga, Scytosiphon lomentaria (Lyngbye) Link in a natural habitat of Sodol, Jumunjin, eastern coast of Korea
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고리매는 동해안에서 식용되어온 유용 갈조류이며, 다양한 생리활성물질을 함유하여 이용이 기대되는 해조류이다. 이 연구는 2021년 1월부터 12월까지 강원도 주문진읍 소돌해안에서 고리매 개체군의 생장 및 성숙 패턴을 밝히기 위하여 수행되었다. 고리매 개체군의 정량조사를 위해 월별 형태분석, 밀도 및 현존량 분석을 실시하였다. 조사지역에서 고리매의 최대엽장은 3월 (수온 10.6°C)에 16.3±3.0 cm, 평균 밀도는 32.5±2.9 ind. m-2 및 평균 현존량은 96.0±12.1 g fresh-wt. m-2였다. 고리매 엽체의 성숙은 4월 (수온 12.1°C)에 최성기를 보였으며, 성숙에 요구되는 성숙유효적산온도는 162.5 degree-days였다.
Abstract
Ecological characteristics of a brown alga, Scytosiphon lomentaria, were investigated from January 2021 to December 2021 in its natural habitat off Sodol, Jumunjin, eastern coast of Korea. The S. lomentaria population at the site formed widespread patches on mid shore. During the investigation, environmental conditions including seawater temperature, salinity, and dissolved oxygen were monitored at the site. Growth and maturation of the S. lomentaria population were identified through qualitative and quantitative investigations. An estimation of the effective cumulative temperature for maturation of the alga was obtained based on growth data and a biological zero temperature of 8°C. Sporangia were observed from February to May when seawater temperatures ranged from 7.7°C to 16.4°C. A maturation peak was detected in April when seawater temperature was 12.1°C. After zoospore release, the alga became bleached and only the crust remained after June. Developmental initiation of the thallus occurred at temperatures above 8°C. Its maturation required approximately 162 degree-days.
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