• 한국수산과학회지
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• 제44권6호
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• pp.740-746
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• 2011

Subtidal benthic macroalgal flora and community structure on barren grounds were examined seasonally along vertical shore gradients on the rocky shore of Hajung, Pohang, on the southeast coast of Korea, from February 2005 to November 2006. Twenty-six seaweed species were identified, including 5 green, 7 brown, and 14 red algae. The number of seaweed species ranged between 7 and 17 among seasons and between 13 and 20 species were found in vertical gradients along the shore. Over the study period, average seaweed biomass (g wet wt/$m^2$) was 299.88 g and it ranged seasonally from 120.99 to 620.00 g. Seaweed biomass declined with increasing seawater depth and ranged between 323.06 and 593.68 g. The dominant seaweed species, in terms of biomass, were Desmarestia ligulata and Sargassum honeri, which grew at depths between 5 and 10 m. The red alga Delisea pulchra was also abundant at a depth of 15 m. No seasonal patterns were found in community indices. Along vertical shore gradients, community indices showed different patterns; the dominance index increased and the richness, evenness, and diversity indices decreased with seawater depth.

• 한국수산과학회지
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• 제44권3호
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• pp.298-307
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• 2011

The species composition and distributions of subtidal marine algae on the east coast of Korea were studied. We examined all species found in permanent quadrats at three depths (3 m, 5 m and 10 m) at Sacheon between October 2008 and December 2009. Coverage and frequency data were collected monthly via underwater photography and analyzed using a modified photo quadrat method. Of the 82 species identified, 10 were chlorophytes, 21 were phaeophytes, 50 were rhodophytes, and one was a seagrass. The largest number of species (59) was found 10 m deep, while the fewest (39) species were present at 5 m. A total 17 species (two green, five brown, and 10 red algae) occurred at all three depths. The vertical distribution of the study site was characterized by the melobesioidean algae, Ulva pertusa, Sargassum confusum, Phyllospadix iwatensis, and Codium arabicum at 3 m deep, melobesioidean algae and U. pertusa at 5 m deep, and Corallina pilulifera, Prionitis cornea, Chondracanthus tenellus and melobesioidean algae at 10 m deep. Given that coralline algae such as melobesioidean algae and C. pilulifera play important roles in coastal ecosystems, thorough studies on the spatial and temporal variations of coralline algae and the dynamics of marine algal communities on the east coast of Korea are now required.

• ALGAE
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• 제23권4호
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• pp.311-316
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• 2008

The seasonal variation of marine algal biomass and community were studied with nondestructive sampling and quadrat method during May 2006 to April 2008 in the intertidal and subtidal zone at Yokjido. As result, total 120 species, 13 Chlorophyta, 34 Phaeophyta, 71 Rhodophyta and 2 Spermatophyta were identified in this study. The major species which contributed significantly to the total biomass were Ulva pertusa, Undaria pinnatifida, Ecklonia stolonifera, Sargassum horneri, S. serratifolium, Gelidium amansii and Prionitis cornea. The mean biomass was 235.5 g wet wt m$^{-2}$ in intertidal, 1,038.9 g wet wt m$^{-2}$ in 1 m, 1,013.1 g wet wt m$^{-2}$ in 5 m, and 19.7 g wet wt m$^{-2}$ in 10 m depths of mean sea level. Seasonal biomass change in intertidal zone, the peak season was in spring, while the lowest was in autumn. The vertical distribution of marine vegetation was characterized by Ulva pertusa - Gelidium divaricatum - Gloiopeltis furcata - Sargassum thunbergii - Hizikia fusiformis at intertidal zone, and Caulerpa okamurae - Gelidium amansii - Chondrus ocellatus - Ecklonia stolonifera - Sargassum horneri - Gracilaria textorii at subtidal zone. These result indicates that the marine algal species and biomass of 1 m and 5 m depths in subtidal zone are greater than intertidal zone, and Ecklonia stolonifera and Sargassum spp. are the dominant species of Yokjido.

• 한국수산과학회지
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• 제54권6호
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• pp.1007-1016
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• 2021

This study examined the characteristics and seasonal distribution patterns of subtidal marine algal communities along the east coast of Korea, from 2016 to 2017, and recorded the coverage ratio (%) by the algal type. During the study period, 134 marine algae species (16 green, 29 brown, and 89 red) were identified at the survey sites. The maximum number of species was observed at the Nagok site (70 species), and the minimum at the Gisamoon site (50 species). The total average biomass (dry weight) during the survey period was 66.22 g/m², including green algae (2.19 g/m²), brown algae (38.10 g/m²), and red algae (25.94 g/m²). The dominant seaweeds in the vertical distribution based on coverage rates (%) were Sargassum yezoense and Dictyopteris divaricata at the upper, Symphyocladia latiuscula and Undaria pinnatifida at the middle, and Agarum clathratum subsp. yakishiriense and Plocamium telfairiae at the lower sections of the distribution. Richness, evenness, and diversity index, calculated based on the biomass of the abundant species, were estimated to be 6.36, 0.55, and 1.98, respectively, over the entire sea area. Based on the evaluation of the environmental states using community indices, the ecological evaluation index (EEI-c) of subtidal marine algal communities along the east coast of Korea was marked as 'good-moderate'.

• 환경생물
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• 제34권4호
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• pp.329-345
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• 2016

해남반도와 신안 및 진도 사이에 위치한 시아해에서 저서동물 주요 우점종, 군집 구조 및 분포 특성을 파악하고자 49개 정점을 설정하고 2001년 11월, 2002년 2월, 5월, 8월에 van Veen grab(채집 면적 $0.1m^2$)을 사용하여 각 정점당 2회씩 저서동물을 채집하였다. 퇴적상은 목포구와 인접한 내측해역은 muddy sandy gravel 퇴적상이, 조류가 강한 명랑수도와 인접한 지역은 gravel의 퇴적상이, 우이도 남측 해역에서는 sand muddy의 퇴적상이었다. 퇴적물내의 유기물 함량은 0.5~1.5%의 범위로서 평균 약 0.6%였다. 전 조사기간 동안 총 271종의 저서동물이 출현하였으며 다모류가 전체의 34%를 점유하여 가장 우점하였으며, 갑각류가 28%, 연체동물이 21%를 점유하였다. 평균 밀도는 $166ind.\;m^{-2}$였으며, 다모류가 약 40%, 갑각류가 26%를 차지하였다. 생체량은 평균 $29.2g\;m^{-2}$로서 연체동물이 44%였다. 입도가 세립한 신안군 압해도에서 입도가 조립한 진도군 외측 해역으로 갈수록 출현 종 수, 밀도 및 생체량이 감소하는 경향을 나타내었으며 Bio-env 분석 결과 군집은 입도 조성과 유기물 함량에 따라 영향을 받는 것으로 나타났다. 주요 우점종으로는 세립질 퇴적상에서는 Photis longicaudata, Septifer keenae, Maldane cristata, Lumbrineris longifolia, Heteromastus filiformis, Coptothyris grayi 등이었다. 집괴 분석 결과 4개의 정점군으로 구분되었으며 SIMPER 분석 결과 정점군 A에서는 Striarca symmetrica, 정점군 B에서는 Glycera chirori, 정점군 C에서는 Heteromastus filiformis, 정점군 D에서는 Latreutes planirostris가 유사도에 영향을 미쳤다. 이 연구결과로부터 시아해의 대형 저서동물 군집은 퇴적상과 이에 수반된 유기물 함량에 따라 영향을 받는 양호한 군집 특성을 보였다.

• ALGAE
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• 제22권1호
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• pp.45-52
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• 2007

An intertidal marine benthic algal vegetation and vertical distribution at Kangnung and it’s vicinity, the eastern coast of Korea was investigated to clarify the community structure and vertical distribution by quadrat method. Marine algae identified from the area were 116 species; 15 green, 31 brown and 70 red algae. The dominant species were Ulva pertusa, Codium fragile, Undaria pinnatifida, Dictyota dichotoma, Gelidium amansii, Corallina pilulifera, Carpopeltis affinis, Grateloupia filicina, Pachymeniopsis elliptica and Chondrus ocellatus at study sites. The vertical distribution of intertidal marine algae was divided into three distinct zones. They were characterized by Porphyra tenera at the upper, Enteromorpha spp. and Ulva pertusa at the middle, and Sargassum thunbergii, Hizikia fusiformis and Pachymeniopsis elliptica at the lower zones, respectively. The vertical distribution of subtidal zone algae were characterized by Laminaria spp. at 15m depth and Kjellmaniella crassifolia at 15 to 25 m depths, whereas Agarum cribrosum was dominant at the lower zone than 25 m depth.

• 한국패류학회지
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• 제26권3호
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• pp.185-199
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• 2010

Correlation between community structure of herbivore and succession of macro-algal flora was examined in subtidal area of Dang-Sa Province, eastern coast of Korea from April 2008 to December 2009. For examination, the authors hypothesized that there are significant correlation between the foregoing two variables. Samplings were conducted every two months quantitatively with SCUBA diving at -3, -6 and -10 depth in the two line transects (barren and forest grounds). As results, rhodophyts was predominated in the algal flora based on the number of species and biomass; molluscs was predominated in the herbivores based on the number of species and echinoderms was predominated in that based on the biomass. There was no significant correlation between the foregoing two variables in the whole survey area and barren/forest grounds. Consequently, the hypothesis was rejected. The authors proposed that examination of correlation between the foregoing two variables should focus on the specific herbivore group(s) (e.g., amphipods) afterward.

• 한국환경과학회지
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• 제21권11호
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• pp.1407-1418
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• 2012

The purpose of this study is to analyze seasonal variations of seaweed community structure according to ocean environment at three areas in the east coast of Korea. Mean water temperatures of Gosung, Samchuk, and Gyeongju were $8.3^{\circ}C$, $11.2^{\circ}C$, and $13.1^{\circ}C$, respectively, during the growing winter season of 2011. Subtidal benthic macroalgal flora and community structure were investigated at the sites between February to November 2011. The numbers of seaweed species at the areas were 38, 12, and 15, respectively. The amounts of biomass were 7.35 kg $m^{-2}$, 1.80 kg $m^{-2}$, and 0.84 kg $m^{-2}$, respectively, during the period. The values of C/P, R/P, and (R+C)/P representing flora characteristics at Sokcho area were 0.1, 1.1, and 1.2, respectively. The values of flora characteristics at Samchuk were 0.3, 0.6, and 1.0, respectively. The values of flora characteristics at Gyeongju were 0.4, 4.0, and 1.2, respectively.

• 한국해양학회지:바다
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• 제21권3호
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• pp.112-124
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• 2016

낙동강 하구역 조하대에 서식하는 대형저서동물의 계절별 군집구조를 파악하기 위해 2013년 2월부터 2015년 11월까지 8개 정점을 선정하여 연구를 수행하였다. 그 결과, 울타리섬 남쪽의 정점들과 낙동강 수로역의 정점들에서 모래함량이 높게 나타났고, 수심이 20 m 이상 되는 곳의 정점들에서는 니질 함량이 높게 나타났다. 낙동강 조하대 해역은 저층 염분이 조사기간 동안 30 psu 수준을 보여 담수에 의한 혼합은 매우 적은 것으로 나타났다. 조사기간 동안 낙동강 조하대 해역에서 출현한 대형저서동물은 총 266종, 서식밀도는 859개체 $m^{-2}$였으며, 다모류의 비중이 출현 분류군 중 가장 높았다. 본 연구해역에서 출현한 대형저서동물의 주요 우점종은 Goniada maculata, Sternaspis chinensis, Magelona japonica, Heteromastus filiformis 등이었고, 2013년 8월에 Pseudopolydora kempi가 일시적으로 대량 출현하였다. 집괴분석 결과, 낙동강 하구역 조하대 대형저서동물의 분포는 퇴적상에 따라 구분이 되었는데, 울타리섬 인접 천해 사질해역에서는 G. maculata, 바깥쪽의 니질해역에서는 S. chinensis와 M. japonica가 우점하는 군집이 분포하고 있었다.

• 한국해양생명과학회지
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• 제7권1호
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• pp.21-28
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• 2022

저서동물은 저서환경특성을 나타내는 중요한 지시자로 알려져 있다. 본 연구에서는 무안만 조하대의 환경 및 저서동물의 분포특성을 조사하였으며, 수질평가지수(WQI)와 저서생물지수(AMBI)를 이용하여 저서생태계 건강성을 평가하였다. 현장채집은 2019년 하계 무안만 조하대의 10개 정점에서 이루어졌다. 무안만 조하대는 상부지역이 하부지역에 비해 세립한 입도특성을 나타내고 있었으며, 높은 유기물 함량을 보였다. 일부 정점에서 오염지표종인 Musculista senhousia, Theora fragilis and Lumbrineris longifolia과 같은 종들도 우점을 나타내고 있었다. 군집분석결과 무안만 조하대는 상부, 중부, 하부 그룹으로 구분되었으며, 유기물 함량과 저서건강성 평가지수(WQI 및 AMBI)와의 상관결과와 일치하였다. 본 연구결과, 무안만 조하대의 저서생태계는 양호한 것으로 평가되었다. 하지만 저서동물이 균등하게 분포하지 않고, 기회종이 출현하고 있어 조하대의 유기물 부하량이 증가하고 있는 것으로 보인다.