• Title/Summary/Keyword: Benthic community

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Polychaetous community is the Coastal Zone Off Samchunpo, Southern Sea of Korea (삼천포시 근해역의 다모류군집)

  • 신현출;고철환
    • 한국해양학회지
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    • v.28 no.4
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    • pp.305-312
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    • 1993
  • This study was carried out to investigate the benthic polychaetous community in the coastal area near Samchunpo City, in September and October of 1989. Polychaete, the dominant faunal group occupying 61.7% in the total faunal density, comprised a total of 50 species with a mean density of 112 indiv.m/SUP -2/. The Number of species and density were higher on the coastal area near Samchunpo Harbor and Samyang Sang-do. The most dominant Polychaete was Terebellides horikoshii (17.1%), followed by Lumbrineris longifolia (14.7%), and Mediomastus sp. (11.5%). The cluster analysis revealed that the study area could be divided into two areas. Each area sustained its specific benthic Polychaete assemblage; Terebellides-Heterogamous assemblage was located in the inner area from Samyang-do, and Lumbrineris-Mediomastus assemblage in the outer area. Lumbrineris-Heterogamous assemblage had higher polychaetous density and species number. Heterogamous sp. was the characteristic species occurring only in Terebellides-Heteromastus assemblage, whereas Mediomastus sp. only in Lumbrineris-Mediomastus assemblage.

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Community Structure of Benthic Marine Algae at Daejin and Jukbyeon on the Mid-East Coast of Korea (동해 중부 대진과 죽변 연안의 저서 해조류 군집구조)

  • Shin, Jae-Deok;Ahn, Jung-Kwan;Kim, Young-Hwan;Lee, Sung-Bok;Kim, Jeong-Ha;Chung, Ik-Kyo
    • ALGAE
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    • v.23 no.3
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    • pp.231-240
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    • 2008
  • The species composition and variation of benthic marine algae at Daejin and Jukbyeon on the mid-east coast of Korea were investigated seasonally from August 2006 to April 2007. As a result, the total of 85 species, including 8 chlorophytes, 26 phaeophytes, 50 rhodophytes and 1 sea grass were identified. 52 species were found at Daejin and 74 species at Jukbyeon. Dominant species in importance value were Corallina pilulifera, Chondrus ocellatus, melobesioidean algae, Sargassum horneri, Sargassum yezoense and Phyllospadix japonica at Daejin, and Corallina pilulifera, melobesioidean algae, Phyllospadix japonica, Acrosorium polyneurum, Sargassum siliquastrum and Hizikia fusiformis at Jukbyeon, respectively. The vertical distribution of algae were characterized by Corallina pilulifera, Hizikia fusiformis, Sargassum spp. (S. siliquastrum, S. yezoense) and Symphyocladia latiuscula at intertidal zone, Sargassum spp. (S. horneri, S. serratifolium, S. yezoense), melobesioidean algae, Phyllospadix japonica and Corallina pilulifera at 1 m depth, melobesioidean algae, Phyllospadix japonica and Sargassum spp. (S. horneri, S. yezoense) at 5 m depth and melobesioidean algae, Phyllospadix japonica and Sargassum spp. (S. horneri, S. micracanthum, S. yezoense) at 10 m depth.

Benthic Polychaetous Community in Kamak Bay, Southern Coast of Korea (가막만의 저서다모류군집)

  • 신현철
    • 한국해양학회지
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    • v.30 no.4
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    • pp.250-261
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    • 1995
  • This study was carried out to investigate the distribution of the benthic polychaetous community in Kamak Bay, in summer of 1993. Polychaetes, the dominant faunal group comprising 74.5% of the total number of fauna, consisted of a total of 84 species with a mean density of 112 indiv.m/SUP -2/. The number of species and density were higher in the mouth area of the bay than in the rest of the bay. The most dominant Polychaete was Tharyx sp.(31.9%), followed by Lumbrineris longifolia (27.5%), Chone sp.(4.5%) and Glycera chirori (4.2%). The correspondence analysis revealed that the study area could be divided into four regions. Northeastern channel and southern mouth region of the bay, named Tharyx-Chone assemblage, sustained higher polychaetous density and species number due to the active water exchange with the outer off-sea, whereas northwestern region of the bay had the poorest polychaetous assemblage in the species number and faunal density owing to the blocking water exchange, high organic enrichment in sediment, and low dissolved oxygen content of bottom water. The central region, named Praxillella-Terebellides assemblage and Gly-cera assemblage, was the transition zone between another two region in species composition.

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Ecology of the Macrobenthic Community in Chinhae Bay, Korea -1. Benthic Environment- (진해만 저서동물의 군집생태 -1. 저서환경-)

  • LIM Hyun Sig;HONG Jae-Sang
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.27 no.2
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    • pp.200-214
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    • 1994
  • In order to clarify the benthic environmental properties as a part of a study on the macrobenthic community in the Chinhae Bay System, water temperature, salinity and dissolved oxygen (DO) in surface and bottom water layers, mean grain size (${\phi}$) and sediment organic carborn (SOC) in surface sediment were analyzed at twelve stations during the period from June 1987 to May 1990. A high sediment organic carbon and hypoxic condition in bottom water due to the development of summer stratification and fine sediment texture toward the inner bay were important environmental characteristics of Chinhae Bay. Hypoxic conditions began to develop in the inner bay from May, and gradually spread toward the outer bay in summer with a peak in September when half the bay was affected by this oxygen deficiency. Recovery from this hypoxic condition in the bottom layer was observed from the beginning of autumn together with a disappearance of the summer stratification. Principal component analyses were carried out from the following five environmental variables:mean water temperature, salinity, dissolved oxygen in the bottom layer and mean grain size, sediment organic carbon in surface sediment. The twelve stations were classified into four areal groups based on the analyses. The division of the areal groups had high correlations to the sediment organic carbon content.

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The Community Structure and Spatial Distribution of Meiobenthos in the Kanghwa Tidal Flat, West Coast of Korea

  • Kim, Dong-Sung;Je, Jong-Geel;Lee, Jae-Hac
    • Ocean and Polar Research
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    • v.22 no.1
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    • pp.15-23
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    • 2000
  • The community structure of meiobenthos was studied in tidal flats of Kanghwado in November, 1997. Nematodes were the most dominant group among 18 total meiofaunal groups at most stations except for at lower tidal flats where the most abundant groups were harpacticoid copepods. Meiobenthos were the most abundant in the upper 1cm and their density decreased depending on the depth from the surface. The highest density of the meiobenthos was 6,094 inds. $10cm^{-2}$ at the upper tidal flat, while the lowest was 1,524 ind. $10cm^{-2}$ at the lower tidal flat. The density was higher in general at the upper tidal flats, but decreased at the stations toward lower tidal flat at all transect lines. At all transect lines, nematodes decreased as stations were along toward lower tidal flat whereas harpacticoids increased. The values of N/C(nematodes/benthic harpacticoids) ratio were higher at the upper tidal flats than the lower tidal flats at all transect lines.

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Suggest on Standardization of Ecological Survey Methods in the Korean Watershed (한국연안에서의 해양생물 생태 조사방법 표준화)

  • 이재학
    • Korean Journal of Environmental Biology
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    • v.22 no.1
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    • pp.1-11
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    • 2004
  • Ecological methods were reviewed through reports such as environmental impact assessment and damage effect of fishery in the Korean watershed. Survey items in marine ecological field were included: phytoplankton, zooplankton, benthic animal, algae, adult fish, egg and juvenile of fish. A standardization of survey method in the field of community ecology was suggested to consider the convenience, Sequency in Use of device, accuracy of data collected from that. It is necessary that spatial data should be sufficiently acquired toy statistical analysis of biodiversity and spatial comparison. Quantitative sampling method must be inevitably adopted based nature of biota and geographical type of the survey area. The same sampling method can make the data compared spatially but can't be applicable in all area. Standardizing survey method should be by no means under certain restriction of study and would become different according to survey environments. The first thing is minutely understanding about ecological character of biota inhabiting in certain area, and then determining survey method.

Community Structure and Productivity of Phytobenthos in Juckdo (Eastern Coast of Korea) I. Benthic Marine Algal Vegetation and its Environment (저서식물의 군집구조와 생산성(죽도, 동해안) I. 해조류의 식성과 환경)

  • 고철환
    • Journal of Plant Biology
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    • v.26 no.3
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    • pp.119-130
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    • 1983
  • Algal vegetation in the subtidal zone between a small rock output and the Juckdo Island, eastern coast of Korea was investigated at several selected sites. The objectives of the survey were to descirbe the poorly known macroalgae community in this area and correlate the pattern of distribution as well as the change of zonatin with the environmental conditions. The water movement, light intensity and theinclinatin of substrate are considered as the environmental parameters. The upper and mid subtidal zones in sheltered area with less steep rocky surface are dominated by large brown algae Srgassum confusum; in the exposed area are characterised by species of Costaria costata. In the lower subtidal zone, the difference of vegetaton between the sheltered and the exposed areas is not recognized. At this depth the light intensity is an important ecological factor. Six narrow algal zones occur in the sheltered area, whereas two broad belts occur in the exposed area. the biomass value is 4 times greater in the sheltered area than in the exposed area.

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The Community Structure and Distribution of the Benthic Macrofauna near Hwasoo Wharf, Inchon, Korea (인천 화수 부두 주변 해역의 저서생물의 군집구조와 분포)

  • Kim, Jae-Jin
    • The Journal of Natural Sciences
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    • v.10 no.1
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    • pp.49-56
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    • 1998
  • The survey of the macrobenthic animals near Hwasoo wharf, Inchon, Korea was carried out during October, 1995 through September, 1996. Polychaeta was the most dominant taxons were Mollusca and Crustacea. Only one species of Echinomermata, Protankyra bidentata, was collected. Capitella capitata collected from site 1 indicates that the site was more polluted, and Heteromasmus sp. collected from sites 2 and 3 suggests that these sites were polluted with organic materials.

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Bioecological Studies of the Eastern Coastal Area in Cheju Island - Seasonal Changes of Macroinvertebrate Commuity on the Intertidal Rocky Shores - (제주도 동부연안역의 생물생태학적 기초연구 - 조간대 암반역에 분포하는 저서무척추동물의 계절적 군집변동 -)

  • 이정재;현재민
    • The Korean Journal of Malacology
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    • v.8 no.1
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    • pp.1-20
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    • 1992
  • A study on the seasonal changes of the benthic macroinvertebrate community was performed on the intertidal rocky shores ao eastern coast of Cheju island and U-do throughout four seasons from october 1991 to August 1992. The macroinvertebrates were composed of 10 phyla, 18 classes, 39 orders, 94 families and 201 species. the number of speecies were 183 in summer, 147 in autumn, 138 in spring and 94 in winter, respectively. The total wpecies collected throuhout the study period were 193 species in U-do and 151 species in the eastern coast of Cheju Island. Nodilittorina exigua was the most dominant species in all seasons, followed by Monodonta neritoides in spring, autumn and winter, and pollicipes mitella in summer. U-do was higher in species diversity and richness and lower in evenness than the eastern coast. Species diversity and richness were higher in summer than any other seasons in lower intertidal zones. Community dominance indices, however, were significantly higher in upper intertidal zones than in lower intertidal zones.

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STUDIES ON THE BENTHIC FAUNA ON GAROLIM BAY,KOREA (가로림만 저서동물군집에 관한 연구)

  • Lee, Jae Hac;Hong, Jae-Sang;Yi, Soon Kil
    • 한국해양학회지
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    • v.18 no.2
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    • pp.111-116
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    • 1983
  • A semi-quantitative investigation on the subtidal macrobenthic community was carried out using dredge in Garolim Bay from February 1980 to June 1981.Of the 340 species of benthic fauna collected,the most dominant species with the numerical abundance of 12.3% was an ophiruroid,Ophiactis modesta which had a strong colony nature.Garolim Bay was also dominated by many suspension-feeders like Ophiactics modesta and Musculista senhousia. Due to hetergenorous sediments,Garolim Bay appeared to be rich and diverse in the faunal composition.Based on th topography of the bay and sediment types,the study area is easily divied into two zones;inner bay and outward bay area.

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