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보분: 섬진강 하구역의 계절별 일차생산력 및 식물플랑크톤 색소 조성 변화
민준오 ( Jun Oh Min ),하선용 ( Sun Yong Ha ),정미희 ( Me Hee Chung ),최보형 ( Bo Hyung Choi ),이연정 ( Yeon Jung Lee ),윤석현 ( Seok Hyun Youn ),윤원득 ( Won Duk Yoon ),이재성 ( Jae Seong Lee ),신경훈 ( Kyung Hoon Shin ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.2
Four in situ incubation experiments were conducted in May, August and November 2009, as well as February 2010 to determine the seasonal primary productivity and the community structure of phytoplankton at the Seomjin estuary. The primary production of phytoplankton ranged from 9 to 3560 mgC m-2 d-1. Primary productivity was the highest in the summer season (August), which was influenced by improved optical and temperature conditions of the water, as well as the supply of nutrients derived from its surrounding watershed. Particularly, the upper station (SJ-1, SJ-2) of Seom-jin estuary showed a higher productivity, as a result of inflow of input nutrients originated from the terrestrial source. The fucoxanthin, as an index pigment of diatoms showed the highest concentration (0.74~9.51 μg L-1) at all stations, occupying 30~80% to total Chl a concentrations. The phytoplankton species composition determination, using a microscope showed similar results to the pigment analysis, which indicated diatom Skeletonema costatum, as the dominant species. The primary productivity in Seom-jin estuary indicates temporally and spatially large variation, according to different environmental conditions. Also, Skeletonema costatum has euryhaline features with relatively higher contribution.
보문 : 하계 강우기 섬진강 하구역의 일차생산력 및 식물플랑크톤 색소조성 변화
민준오 ( Jun Oh Min ),하선용 ( Sun Yong Ha ),최보형 ( Bo Hyung Choi ),정미희 ( Mi Hee Chung ),윤원득 ( Won Duk Yoon ),이재성 ( Jae Seong Lee ),신경훈 ( Kyung Hoon Shin ) 한국하천호수학회(구 한국육수학회) 2011 생태와 환경 Vol.44 No.3
Field observations and culture experiments have been carried out during the rainy season (on the 6th, 8th and 27th July 2009) to examine changes in the primary productivity and associated plant pigments in the estuary of the Seom-jin River. Primary productivity was determined at four sampling stations along the salinity gradient. On 6th July (before heavy rain) primary productivity ranged from 689~1,169 mgC m-2 d-1. On the 8th, just after more than 216.5 mm of precipitation, euphotic layers at all stations were reduced to very shallow water because of the high concentration of suspended solids in the water. This resulted in dramatically decreased primary productivity down to as low as 12~32 mg C m-2 d-1. However, after the rain, primary productivity on the 27th ranged from 266~999 mgC m-2 d-1, demonstrating a fast recovery in the upper stream water to similar productivity levels to those before the rainy season. Concentration of fucoxanthin in the water was highest on the 6th July. Before the rain, concentration of the zeaxanthin, increased as the salinity decreased. Immediately after the heavy rain, the Chl b (Chlorophytes) concentration was higher at all sites than before the rainy season. The concentration of fucoxanthin decreased after the heavy rain. At the downstream site, peridinin (Dinoflagellates) were found. During the rainy season, the diatoms contributed to the primary productivity at all sites. However, after the rainy season, Chl b (Chlorophytes) and Peridinin (Dinoflagellates) increased, demonstrating the enhanced contribution of those species in addition to diatoms.