[논문]낙동강 하구 모래갯벌에 서식하는 대형저서동물의 군집구조와 분포양상

서진영; 최진우; 신경순

doi:10.23005/ksmls.2020.5.2.81

낙동강 하구 모래갯벌에 서식하는 대형저서동물의 군집구조와 분포양상
Faunal Composition and Spatial Distributions of Macrozoobenthos in the Tidal Flat of the Nakdong River Estuary, Korea 원문보기

한국해양생명과학회지 = Journal of marine life science, v.5 no.2, 2020년, pp.81 - 91

서진영 (한국해양과학기술원 위해성분석연구센터) , 최진우 (서울대학교 해양연구소) , 신경순 (한국해양과학기술원 선박평형수연구센터)

초록
AI-Helper

낙동강 하구 울타리섬 주변 갯벌에 서식하는 대형저서동물의 분포현황을 파악하기 위해 2016년과 2017년 5월에 신자도, 진우도, 을숙도에서 현장조사를 수행하였다. 조사 해역에서는 31~39종의 대형저서동물이 출현하였고, 서식밀도는 789~1,644 ind.m^-2의 범위를 보였다. 출현종수는 신자도에서 가장 높았으나, 서식밀도는 신자도에서 가장 낮았고, 진우도에서 높게 나타났다. 본 연구 해역에서 출현한 대형저서동물의 주요 우점종은 갑각류의 Gammaridae unid., 다모류의 Scoletoma heteropoda, Scoloplos armiger, Heteromastus filiformis, Prionospio japonica, 연체동물의 댕가리(Batillaria cumingii), Laternula marilina 등이었다. 세 지역 모두 갯벌의 상부지역에서는 갑각류와 연체동물의 비중이 높았고, 하부로 갈수록 다모류의 비중이 다소 증가하는 경향을 보였다. 전체적으로 육식자의 비중이 높게 나타났으나, 니질 퇴적물의 함량이 높은 지역에서는 퇴적물 안정화에 기여하는 tube-builder가 속한 표층 퇴적물 식자의 비중이 다소 높게 나타났다. 낙동강 하구 모래갯벌의 대형저서생물상은 국내 다른 하구 모래갯벌이나 조간대 모래갯벌의 생물상과 유사한 종조성과 분포양상을 보였다.

Abstract ▼ AI-Helper

This study was conducted to find the faunal composition and distribution patterns of macrobenthos where the sand tidal flat around barrier island at Nakdong River estuary in May, 2016 and 2017. The number of species ranged from 31 to 39, and density was from 789 to 1,644 ind.m-2 during the study period in the three tidal flats. The number of species and density were the highest in the tidal flat of Shinja-do and Jinwoo-do, respectively. The dominant species were Gammaridae unid. in amphipods of crustacea, Scoletoma heteropoda, Scoloplos armiger, Heteromastus filiformis, Prionospio japonica in polychaeta and Batillaria cumingii, Laternula marilina in mollusks from the three tidal flats. The proportion of carnivores such as crustacea and mollusks was higher in the upper part of the tidal flat, and polychaetes of deposit feeders, dominated in the middle and lower tidal flat. Overall, the intertidal macrobenthic communities in the study area showed a high proportion of carnivores. However, the sites where the mud content is high such as muddy sand sites, they showed a higher proportion of surface deposit feeders belonging to tube-builders which contribute to sediment stability. From this study, it seemed that the macrobenthic fauna of the sandy tidal flat at the Nakdong River estuary showed a similar fauna composition and zonal distribution patterns from those in other sandy tidal flats in Korea.

주제어

표/그림 (15)

그림 Fig. 1. The sampling sites at the tidal flats around the barrier islands in the Nakdong River estuary during May of 2016 and 2017.
그림 Fig. 2. The composition of surface sediments at each site in the study area (16_00 mean year_site, st. 0 at 2016).
그림 Fig. 3. The fauna composition of macrozoobebthos (species number, density and biomass) collected during two spring seasons (May, 2016 and 2017) in the Jinwoo-do tidal flat.
그림 Fig. 4. Comparison of macrobenthic faunal composition and community parameters such as species richness, density and bio-mass collected during two sampling times (May, 2016 and 2017) in the tida flat around the Nakdong River estuary.
그림 Fig. 5. The spatial distribution patterns of dominant species during two sampling times (May, 2016 and 2017) in the Jinwoo-do tidal flat.
그림 Fig. 6. Dendrogram from cluster analysis and an ordination plot from nMDS analysis based on the abundance data of macrobenthos of the Jinwoo-do tidal flat in May, 2016 and 2017. Each site variable was expressed as year month_site, e.g. 1705-1 indicates the fauna data clooected in May, 2017 at st. 1.
표 Table 1. The characteristic species of each site group in the Jinwoo-do tidal flat and their contributions from the SIMPER analysis
그림 Fig. 7. The fauna composition of macrozoobenthos (species number, density and biomass) collected during two spring seasons (May, 2016 and 2017) in the Shinja-do tidal flat.
그림 Fig. 8. The spatial distribution patterns of dominant species during two sampling times (May, 2016 and 2017) in the Shinja-do tidal flat.
그림 Fig. 9. Dendrogram from cluster analysis and an ordination plot from nMDS analysis based on the abundance data of macrobenthos of the Shinja-do tidal flat in May, 2016 and 2017. Each site variable was expressed as year mohth_site, e.g. 1705-1 indicates the fauna data collected in May, 2017 at st. 1.
표 Table 2. The characteristic species of each site group in the Shinja-do tidal flat and their contributions from the SIMPER analysis
그림 Fig. 10. The proportions of species number, density and biomass of each taxon at May, 2016 and 2017 in the Eulsuk-do tidal flat.
그림 Fig. 11. The spatial distribution patterns of dominant species during two sampling times (May, 2016 and 2017) in the Eulsuk-do tidal flat.
그림 Fig. 12. Dendrogram from cluster analysis and an ordination plot from nMDS analysis based on the abundance data of macrobenthos of the Eulsuk-do tidal flat in May, 2016 and 2017. Each site variable was expressed as year month_site, e.g. 2017-1 indicates the fauna data collected in May, 2017 at st. 1.
표 Table 3. The characteristic species of each site group in the Eulsuk-do tidal flat and their contributions from the SIMPER analysis

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