• Title/Summary/Keyword: Benthic community

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Seasonality of the Community Structure in Benthic Communities on a Macrotidal Flat, Inchon, Korea (서해 중부 갯벌에 서식하는 대형저서동물의 군집 구조의 계절성)

  • 유재원;홍재상
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2000.05a
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    • pp.369-370
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    • 2000
  • 생태계에 대한 지속적 연구를 통하여 축적되는 장기변동 자료와 이에 대한 관찰은 의미있는 가설의 전개와 생태학적 개념의 타당성에 대한 검정 등에 중요한 역할을 한다고 볼 수 있다 (Franklin, 1987). 최근들어, long-term scale에서의 생태계 변화는 생태학자들 간에 주된 관심사가 되고 있다. 이러한 배경에서 본 연구자들은 인천 연안의 대조차 간석지에서 수행되고 있는 척전 갯벌 program을 통하여 간석지 대형 저서 동물 군집의 장기 변동 (1989 ∼ 현재)을 관찰, 분석하고 있으며, 그 첫 단계로서 계절성에 관한 분석을 시도하였다. (중략)

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Taxonomy and ecology of a new species of Rhizothrix Brady & Robertson (Copepoda, Harpacticoida) in the intertidal zone of a sandy shore, southern Korea

  • Gyeong, Seon-Seo;Gyeong, Seo-Ho;Rip, Seo-Hae
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2001.05a
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    • pp.479-480
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    • 2001
  • Harpacticoid copepods are one of the most important components in the benthic meiofaunal community. In spite of their numerical significance the study of harpacticoids in Korea, as distinct from meiofauna in general (Kim et al., 1998, 2000a, b), has been limited. During the course of investigation on ecological significance of harpacticoids in the intertidal sandy shore, a new species of the genus Rhizothrix was determined and described here. (omitted)

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Effects of Construction and Operation of Nuclear Power Plants on Benthic Marine Algae (원자력발전소의 건설과 가동이 저서 해조류에 미치는 영향)

  • 김영환
    • Korean Journal of Environmental Biology
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    • v.17 no.4
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    • pp.379-387
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    • 1999
  • During the past several decades, electricity generating plant increased with remarkable rapidity in Korea. Recently the increase has been much more rapid as the rate of industrialization has accelerated. Construction of nuclear power plants in coastal areas inevitably caused the perturbation of critical coastal habitats and thus influenced marine algal species composition. Particularly, an increase in the building of nuclear power plants led the amounts of heat discharged to increase exponentially. As far as the effects of cooling water and thermal discharges are concerned, benthic marine algae are likely to be vulnerable to a discharge. Heated effluents from nuclear power plants, with the temperature rises of 7~12$^{\circ}C$ under normal operating and design conditions, are discharged through the discharge canal and into natural water bodies. It is clear that the characteristic marine algal community is developed in the area affected by the thermal discharges; i.e. low species richness and low species diversity. Nevertheless, it is worthwhile to note that elevated temperatures exert differential effects depending on the algal populations. Benthic marine algae grown at the discharge canal can be regarded as warm tolerant species. 35 species (4 blue-green, 9 green, 8 brown and 14 red algae) of marine algae occurred more than 20eye frequency at discharge canal of three nuclear power plants in the east coast during 1992 ~ 1998 and thus can be categorized as warm tolerant species in Korea. To minimize the ecological impacts of waste heat on benthic marine algae, it is recommended that, in the future, nuclear power plants will have to employ some form of closed-cycle cooling for the condensers.

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Study on the Long-term Changes in Water Quality and Benthic Ecology and Evaluation on Effect of the Barrage in Nakdong River Estuary (낙동강 하구 수질 및 저서 생태의 장기 변화와 하굿둑의 영향 평가)

  • Park, Sohyun;Lee, Jiyoung;Choi, Jae Ung;Heo, Nakwon;An, Soonmo
    • Journal of Wetlands Research
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    • v.18 no.1
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    • pp.58-67
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    • 2016
  • This study was performed to investigate the long-term changes in water quality and benthic ecology around the Nakdong River Estuary. The effect of the estuarine barrage on the ecosystem was also evaluated. The water quality was interpreted using the field survey (2013 and 2014) and monitoring data (MOE, 1989~2013) and the macrobenthic-fauna was investigated through analysis of the field survey data (2014) and literatures review (1985~2013). The long-term variation of water quality of Nakdong River generally showed increased nutrient concentration with decreased discharge, while abrupt influence of the barrage construction was not observed. However, the nutrient and organic matter concentration inside the barrage distinctly was higher than the concentration outside the barrage because the mixing of fresh and seawater was limited by the barrage. Especially, in the period of low discharge during winter, the Chlorophyll-a concentration clearly increased more in the downstream inside the barrage, showing the barrage effect. In other words, stagnant effect caused by barrage construction had an effect on the water quality degradation in dry seasons. As for the benthic ecology inside barrage after barrage construction, molluscans and brackish-water crustaceans disappeared. Outside the barrage, benthic ecosystem has deteriorated and the small-sized organic indicative species like Prionospio membranacea, Pseudopolydora kempi, Sinocorophium sinensis became dominant due to several construction such as Myeong-Gi Bridge, Airport construction, industrial complex after the Nakdong barrage construction.

Comparison of Meiobenthic Faunal Communities in Seagrass Bed and Adjacent Bare Sediment (해초지와 주변 퇴적물에 서식하는 중형저서동물 군집 특성 비교)

  • 민원기;김동성;최청일
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.8 no.1
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    • pp.1-13
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    • 2003
  • To investigate the community structure and meiofaunal density in seagrass/bare non-seagrass beds, a survey was conducted at three seagrass bed locations in Doomoojin of Baegryongdo, inner harbor of Eocheongdo in May 1999, and Yulim of Dolsando for every month from February to July 1999. Meiobenthic samples were collected from sediments within seagrass beds (SB) and non-seagrass bed (or adjacent to barren sand area, NSB). Nematodes were the most dominant group among representative 13 meiofaunal groups. The sub-dominant groups were benthic for-aminiferans, benthic harpacticoids, and annelids. The highest density of meiofauna was recorded at a seagrass bed of Yulim (7,244 ind/10 $\textrm{cm}^2$ in June), and lowest density was recorded at a non-seauass bed of Baegryoungdo (438 ind/ 10 $\textrm{cm}^2$ in May). For vertical distribution, the highest density of meiofauna was recorded at 0-2 cm depth, and the density abruptly decreased with depth in all stations. The density of meiofauna in size between 0.125 m and 0.25 mm was maximum. Sediment types for the study areas ranged from sandy to sandy mud by the Folk's classification. The density of total meiofauna, the number of taxa, and the density of the dominant groups (nematodes, benthic for-aminiferans, benthic harpacticoids, annelids) between SB and NSB were significantly different. The results clearly showed the importance of seagrass bed as suitable habitat for meiofauna.

Distribution of Sedimentation Environments and Benthic Macro-fauna Communities in Habitats and Non-habitats of Zostera marina on the Yeongheung-do Tidal Flats, West Coast of Korea (한국의 서해안 영흥도 조간대의 거머리말(Zostera marina) 서식지와 비서식지에서 퇴적환경과 대형저서동물군집의 분포)

  • Bae, Jong Il;Shin, Hyen Chul;Hwang, Sung Il;Lee, Jeng Ho
    • Korean Journal of Environmental Biology
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    • v.36 no.2
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    • pp.107-116
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    • 2018
  • In this study, the distribution of sedimentary environment and benthic macro-fauna in habitats and non-habitats of Zostera marina were investigated. The purpose of this study was to obtain basic data about the sedimentary environment and benthic macro-fauna in the habitats and non-habitats of Z. marina. Sand was dominant within habitat environments, whereas the non-habitats were predominantly composed of silt. As a result, the habitats of Z. marina have a different grain size and organic matter content compared to the non-habitats. These differences in the sedimentary environment were expected to influence the species composition of benthic animals. Benthic communities in the habitats of Z. marina showed a higher density and a greater number of species than in the non-habitats. As a result of an ecological index evaluation, the species diversity index (H') was $3.44{\pm}0.10$ for the habitat; the non-habitat was analyzed as $2.34{\pm}0.35$. It was also found that the stability of community in the habitats was higher than that in the non-habitats. The cluster analysis also clearly showed that habitats and non-habitats of Z. marina have distinct characteristics.