Daemadeung, located in the estuary of the Nakdong River, is formed by sand dunes and possesses well-developed intertidal flats. This study aimed to investigate the habitat of benthic microalgae, photosynthetic pigments, and photosynthetic efficiency in the intertidal flats of Daemadeung from January to December 2011. The inorganic nitrogen content in the sediment pore water was primarily composed of ammonium, while nitrate+nitrite was dominant in the upper layer water. The concentration of chlorophyll a and fucoxanthin in the sediment surface was significantly higher than the mean of all the sediment layer. The average Fv/Fm of benthic microalgae during the entire survey period was 0.52±0.03, with the highest value (0.61±0.08) observed in February. The rETRmax showed a seasonal trend, being high from spring to early autumn (April to October) and low from winter to early spring (January to March, November, December), with the highest value (153.05±2.30 μmol electrons m-2 s-1) in July and the lowest (38.49±5.17 μmol electrons m-2 s-1) in January. The average Fv/Fm of diurnal microalgae was 0.48±0.03, with the highest value (0.61±0.08) observed at noon. The rETRmax showed a highest peak at noon (54.24±11.35 μmol electrons m-2 s-1) and reached its lowest point at 16:00 (26.17±4.75 μmol electrons m-2 s-1). These findings suggest that the productivity of benthic microalgae varies significantly depending on the survey time and sediment depth. Therefore, to quantify the productivity of benthic microalgae using Diving-PAM, surveys should be conducted based on tidal conditions, and simultaneous pigment analysis of sediment layers should also be performed.

서 론
재료 및 방 법
    1. 갯벌의 저서미세조류 서식환경 조사
    2. 저서미세조류의 색소분석
    3. Diving-PAM에 의한 광합성 특성
    4. 통계분석
결 과
    1. 광량, 강우량, 해수 및 퇴적물의 영양염류
    2. 조사시간에 따른 BMA의 색소 조성과 농도
    3. 조사시기 및 시간에 따른 Diving-PAM에 의한광합성 특성
고 찰
적 요
REFERENCES

• 김정배(국립수산과학원 중앙내수면연구소) | Jeong Bae Kim (Inland Fisheries Research Institute, NIFS, Geumsan 32762, Republic of Korea)
• 정미희(해양미세조류연구소) | Mi Hee Chung (Marine Micro Algae Research Institute, Busan 48076, Republic of Korea)
• 박정임(수중생태기술연구소) | Jung-Im Park (Underwater Ecology Institute, Yeosu 59769, Republic of Korea) Corresponding author