함평만 갯벌의 저서규조류 분포 특성
Distribution of Benthic Diatoms in Tidal Flats of Hampyeong Bay, Korea
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초록
함평만 갯벌에 출현한 저서규조류는 총 45종이었으며Paralia sulcata가 가장 우점하는 것으로 나타났다. 출현종 분포에서는 전 지점에서 4월에 가장 다양했고 1월에가장 단순한 종조성을 나타냈으나 큰 차이가 없는 것으로 나타나 고온기의 높은 다양도는 볼 수 없었다. 표층퇴적물 시료의 chlorophyll a 농도는 19.7~35.2 mg m^(-2)이었고 평균 28.7 mg m^(-2)로 나타났다. 표층 퇴적물 내pheopigment의 농도 범위는 25.3~45.2 mg m^(-2)이었고평균 36.2 mg m^(-2)로 다른 지역의 결과와 차이가 없었다. 저서규조류 단위면적당 출현 개체수는 지점별, 조사시기별 큰 차이를 보여주었다. 전 조사지점에서 4월에 가장많은 개체수 밀도를 나타냈고 1월, 2월, 10월에 상대적으로 낮은 출현개체 밀도를 나타냈다. 생물량의 분포는 개체수 밀도의 분포와 유사한 양상을 나타냈다. 생물량은4월에 함평만 갯벌의 전 조사지점에서 가장 높게 나타났고 1월과 2월, 그리고 10월의 조사에서 상대적으로 낮게 나타냈으며, 4월 이후에는 뚜렷한 감소의 경향을 나타냈다. 생물량과 출현종 다양도는 온도와 2차원의 회귀에 적합한 상관성을 보였으며 중간교란가설 (intermediate disturbance hypothesis)과 유사한 모델로 나타났다. 그러나 함평만 갯벌 저서규조류의 분포가 온도에 의존적이며 중간교란가설의 패턴을 따른다고 판단할 수는없었다.
Abstract
The distributional pattern of benthic diatoms in tidal flats of Hampyeong Bay, Korea,was studied from January to October in 2009. As benthic diatoms of Hampyeong Bay tidal flats,45 species were identified, and the most dominant species was Paralia sulcata. The most diverse flora was observed at Gaip and Songseok sites in April with 22 species, and the least at Hyeonhwa site in January. The ranges of chlorophyll-a concentration in tidal flats were 21.2~31.8 mg m^(-2) at Hyeonhwa site, 23.6~35.4 mg m^(-2) at Gaip site, and 24.2~34.3 mg m^(-2) at Songseok site. The concentrations of pheopigment ranged between 25.3 and 45.2 mg m^(-2). The standing crops of benthic diatoms showed highest density in April and lowest in January, February, and October. The cell volumes of benthic diatoms were highest in April. The taxa and biomass of benthic diatoms showed correlations with temperature. On temperature variables, the benthic diatoms showed optimal occurrences at the range of 14~17℃.
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