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.

Abstract
서 론
재료 및 방법
    1. 분포 및 환경조사
    2. 개체군 생태조사
    3. 형태형질 측정
    4. 성숙유효적산온도 추정
    5. 통계처리
결과 및 고찰
    1. 생태 및 환경적 특성
    2. 생장특성
    3. 성숙유효적산온도
적 요
사 사
REFERENCES

• 한명석(오션씨위드) | Myeong Seok Han (Oceanseaweed, Gangneung 24525, Republic of Korea)
• 박찬선(국립목포대학교 해양수산자원학과) | Chan Sun Park (Department of Marine and Fisheries Resources, Mokpo National University, Muan 58554, Republic of Korea)
• 황은경(국립수산과학원 수 산종자육종연구소) | Eun Kyoung Hwang (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science, Haenam 59002, Republic of Korea) Corresponding author