• Title/Summary/Keyword: Chuja island

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Species Composition and Biomass of Intertidal Seaweeds in Chuja Island (추자도 조간대 해조류의 종조성과 생물량)

  • Kim, Myung-Sook;Kim, Mi-Ryang;Chung, Mi-Hee;Kim, Jeong-Ha;Chung, Ik-Kyo
    • ALGAE
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    • v.23 no.4
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    • pp.301-310
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    • 2008
  • The marine benthic algal flora and biomass of Chuja Island, southern coast of Korea, was investigated. The collections of intertidal marine algae were made at two sites, Yecho of Hachujado and Hupo of Sangchujado, from October 2006 to July 2007. A total of 162 species, including 15 green, 47 brown and 100 red algae, were identified in this study. The occurrence of species according to season was abundant during spring to summer and less in autumn. The vertical distribution of intertidal zone in Chujado was characterized by Gloiopeltis spp., Myelophycus simplex, Ishige okamurae, Chondrus ocellatus, Grateloupia elliptica, Hizikia fusiformis and Sargassum spp. The average biomass of macroalgae was measured as 400 g wet wt m$^{-2}$. The dominant species based on the biomass were Sargassum yezoense, S. coreanum and Hizikia fusiformis. ESG II (ecological state group) as an opportunistic species, including sheet form, filamentous form, and coarsely branched form, occurred 85.8% in the intertidal seaweeds. These results provide a baseline for future monitoring studies in the Chuja Island.

A Study on Geographical Market Segmentation of Island Tourists (섬 관광객의 지리적 시장세분화에 관한 연구)

  • Lee, Jin-Hee
    • The Journal of Fisheries Business Administration
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    • v.49 no.4
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    • pp.53-68
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    • 2018
  • The industrial structure of Chuja Island is mainly occupied by fisheries. Since the fisheries resources have been depleted and the marine environment has been changed, the fishery industry has been hard to survive. It is the time when residents are looking for a breakthrough in the tourism industry. Market segmentation is a valuable tool in the establishment of marketing strategies. Segmentation of tourists by the same desire and motivation is an essential factor in identifying the characteristics of tourists. The research on market segmentation of tourism sector focuses mainly on demographic subdivision, psychological subdivision, and behavioral subdivision, so it is urgent to study geographical market segmentation. The purpose of this study is to present data that can be used to establish a marketing strategy for tourism promotion in Chuja Island by analyzing the tourism activities via subdivision market according to demographic characteristics, tourism behavior characteristics, and tourism motivation after grasping the geographical segment of tourists through empirical analysis. In this study, 285 valid samples were analyzed by frequency analysis, ${\chi}^2$ test, cluster analysis and ANOVA test.

Selection Attributes on Behaviour Intention of Island Tourism : focused on Chuja region (도서 관광지의 선택속성, 서비스 가치, 만족도 및 행동의도 관계 연구: 추자도를 대상으로)

  • Choi, Yong-Bok;Boo, Chang-San;Kim, Min-Cheol
    • Journal of Fisheries and Marine Sciences Education
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    • v.24 no.3
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    • pp.406-415
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    • 2012
  • The objective of this paper was to analyze the relationships between the factors of selection attributes and the behavior intention focusing on Domestic tourists in Chuja island. This paper utilized the path analysis to investigate the factors of selection attributes affecting the visitors' satisfaction and re-visit intention through service value as mediating factor. This study showed the most important thing among the factors influencing service value in research model was 'uniqueness of island'. Finally, this paper presented that the selection attributes had affected overall satisfaction and re-visit intention through the mediation of service value. In addition, this study calculated total effect including indirect and direct effect of the choice attributes on behavior intention. This result can give the stakeholders related to Chujado island a implication for a better policy of tourism development.

Seagrass Distribution in Jeju and Chuja Islands (제주도와 추자도에 자생하는 잘피의 분포 현황)

  • Park, Jung-Im;Park, Jae-Yeong;Son, Min Ho
    • Korean Journal of Environmental Biology
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    • v.30 no.4
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    • pp.339-348
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    • 2012
  • To survey the seagrass distribution in Jeju and Chuja Islands, we directly observed seagrass beds using SCUBA in July, 2011. Distributional area, species composition, morphology, density, and biomass of seagrasses and environmental characteristics were examined in investigation sites. In particular, three protected seagrass species (Zostera marina, Z. caulescens and Z. caespitosa) were found in the investigation areas. While the three species were found in Chuja Island, only Z. marina was distributed in Jeju Island. Z. marina was distributed only north-eastern coast of Jeju Island, and the total coverage was $238,572m^2$. Total seagrass coverage of Chuja Island was $23,584m^2$. In detail, Z. caulescens Z. caespitosa and Z. marina were 21,216, 1,870 and $498m^2$, respectively. Of these, Z. marina was found from the intertidal to subtidal zones of 5m MSL (mean sea level) depth. Z. caespitosa and Z. caulescens were found in subtidal zones of 3~4 m and 4~6m MSL depth, respectively.

VARIATIONS OF SEA SURFACE TEMPERATURE BETWEEN JEJU AND MOGPO AND BETWEEN JEJU AND WANDO (제주와 목포, 제주와 완도간의 표면수온 변화)

  • Rho, Hong Kil;Kim, Kuh
    • 한국해양학회지
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    • v.18 no.1
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    • pp.64-72
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    • 1983
  • A series of sheps-of-opportunity sea sryface temperature (SST) measurement beween Jeju and Wando during a period from December 1979 through June 1981 produced following results. 1. A sihnificantly warm water appeared south of Chuja Island and Cheongsan Island during Island. It is suggested that this water represents a current entering the Jeju Strait from the west. Direction of this currint in other seasons is not certain. 2. Coastal waters were found north of the Cheongsan Island and Bogil Islhnd throughout the measurement period. In February these waters sometimes reached as far as Chuja Island to south. 3. Frequently thermal fronts were observed near the Chuja Island and the Cheongsan Island. 4. In summer cold waters appeared north of the Chuja Island and Changsu Island. Intrusion of cold bottom water from offshore and its subsequent vertical mixing due to strong tidal current are probably reponsible for this appearance. 5. Cold waters also appeared locally around islands and in ghe Jeju Harbor in spring and summer. 6. North-south SST difference reached 8-9$^{\circ}C$ in winter which is the annual maximum. 7. Annual range of SST varies from 12-14$^{\circ}C$ in the central part of the Jeju Strait to 16-20$^{\circ}C$ in coastal waters to north. The highest SST appeared everywhere in September but the lowest one did not appesr in the same month of year.

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VULCANOKARST ON CHEJU ISLAND IN SOUTH KOREA

  • Hong, Shyhwan
    • Journal of the speleological society of Korea
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    • v.41 no.1
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    • pp.3-15
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    • 1994
  • Geographically Cheju Island is located in the southmost part of Korea. Cheju Province, the largest. island in Korea, consists of one major island, Cheju, and other minor islands including Chuja Island. The province is located in around 140 km from Mokpo on the north, about 272 km from Pusan. Tsushima Island of Japan on the northeast, and Shanhai of the China across the East China Sea to the west.(omitted)

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A Taxonomical and Ecological Study on the Flora of Chuja Island (추자도 식물상에 관한 분류$\cdot$생태학적 연구)

  • Lim, Joung Whan;Ho Joon Lee;Chang Ho Kim;Seon Ho Kim
    • The Korean Journal of Ecology
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    • v.5 no.4
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    • pp.187-203
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    • 1982
  • The results obtained from te field investigations of Chuja Island conducted for 5 days from July 18 to 22, 1980 and from August 12 to 16, 1981 are summarized as follows: Vascular plants of this island disclosed by the present study consisted of 86 families, 210 genera, 228 species, 38 varieties and 4 래금. Nineteen species of evergreen broad-leaved trees were discovered, including Litsea japonica Juss, Camellia japonica L. and Machilus thunbergii Sieb. et Zucc. These indeciduous latifoliate trees were preserved in poor condition. Ten-twenty years old Pinus thunbergii was confirmed to be the predominant species. Seaside plants encountered were 6 species, including Vitex rotundifolia L. Fil. and Asterspathullfoius Max., but they were poorly distributed. Naturalized plants comprised a total of 12 species. This varied number of species is considered attributable to the frequent access of men owing to convenient marine traffic. the destruction of vegetation of this island may be attributed to human interference (loggin for boat construction, building and charcoal materials) ever escalated by high population density. It is worthy of noting that Bochmeria penosa Nakai et Stake which forms a large community in this island can be used as textile resources.

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Sponge-Specific Unknown Bacterial Groups Detected in Marine Sponges Collected from Korea Through Barcoded Pyrosequencing

  • Jeong, Jong-Bin;Kim, Kyoung-Ho;Park, Jin-Sook
    • Journal of Microbiology and Biotechnology
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    • v.25 no.1
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    • pp.1-10
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    • 2015
  • The bacterial diversity of 10 marine sponges belonging to the species Cliona celata, an unidentified Cliona species, Haliclona cinerea, Halichondria okadai, Hymeniacidon sinapium, Lissodendoryx isodictyalis, Penares incrustans, Spirastrella abata, and Spirastrella panis collected from Jeju Island and Chuja Island was investigated using amplicon pyrosequencing of the 16S rRNA genes. The microbial diversity of these sponges has as of yet rarely or never been investigated. All sponges, except Cliona celata, Lissodendoryx isodictyalis, and Penares incrustans, showed simple bacterial diversity, in which one or two bacterial OTUs occupied more than 50% of the pyrosequencing reads and their OTU rank abundance curves saturated quickly. Most of the predominant OTUs belonged to Alpha-, Beta-, or Gammaproteobacteria. Some of the OTUs from the sponges with low diversity were distantly (88%~89%) or moderately (93%~97%) related to known sequences in the GenBank nucleotide database. Phylogenetic analysis showed that many of the representative sequences of the OTUs were related to the sequences originating from sponges and corals, and formed sponge-specific or -related clades. The marine sponges investigated herein harbored unexplored bacterial diversity, and further studies should be done to understand the microbes present in sponges.

Evaluation of Methods Used in the Calculation of Condition Index Using the Mussel, Mytilus coruscus (Gould, 1861) Collected from Chuja Island, Cheju, Korea (추자도산 홍합, Mytilus coruscus (Gould, 1861) 의 Condition Index 산정에 대한 연구)

  • 강도형;최광식
    • The Korean Journal of Malacology
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    • v.15 no.1
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    • pp.57-62
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    • 1999
  • Condition indices (Cl) are considered to be useful measurements of the nutritive and health status of bivalves although studies on Cl of bivalves are limited due to the lack of a standard formula for calculating Cl. This study attempts to generate Cl of the mussel, Mytilus coruscus inhabiting along the coastal area of Chuja Island in Cheju using three primary formulas. the formulas used in this study: (1) Cl-vol= [tissue dry weight (g) 1000] /shell cavity volume (ml). (2) Cl-wt= [tissue dry weight (g) 1000] / internal shell cavity capacity (g). (3) Cl-size= tissue wet weight (g)/[shell length (mm)]$\^$3/. Monthly condition indices calculated with the three formulas are compared using ANOVA, Duncan's multiple range test and Pearson correlation coefficient. In Chuja Island M. coruscus collected ranged from 50 to 180 mm in shell length. Monthly ranges of Cl-values were 67.48 to 140.61 (Cl-vol), 74.67 to 118.02 (Cl-wt) and 1.4 10$\^$-5) to 1.6 10$\^$-5/ (Cl-size). Cl-vol values in August were higher than two Cl-values in the other months. Monthly Cl-vol was significantly different from Cl-wt and Cl-size. (p<0.05). The results of this study suggest that volumetric condition index (Cl-vol) used in this study is acceptable as a standard measure to evaluate conditions of M. coruscus.

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A New Sesterterpene from the Korean Sarcotragus sp. Sponge

  • Woo, Jung-Kyun;Jeon, Ju-eun;Kim, Bora;Sim, Chung J.;Oh, Dong-Chan;Oh, Ki-Bong;Shin, Jongheon
    • Natural Product Sciences
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    • v.21 no.4
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    • pp.237-239
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    • 2015
  • Sarcotragin C (1), a new sesterterpene metabolite was isolated from a Sarcotragus sp. sponge collected from Chuja Island, Korea. On the basis of the combined spectroscopic analyses, the structure of this compound was determined to be a linear norsesterterpene containing a leucine-derived ${\gamma}-lactam$ moiety. This compound exhibited moderate cytotoxicity against K562 and A549 cell-lines.