• Proceedings of the Zoological Society Korea Conference
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• 2003.08a
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• pp.152.3-152
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• 2003

• Korean Journal of Environment and Ecology
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• v.28 no.6
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• pp.613-626
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• 2014

Seaweeds were identified after qualitative sampling at 14 stations of Dokdo coasts from May to July 2013 and seaweeds and animals inhabiting 23 Eisenia bicyclis plants were examined to evaluate its ecological role. Biomass was calculated by using regression between stipe length and weight of E. bicyclis. A total of 128 species were identified, including 18 green, 35 brown, and 75 red algae. Coarsely branched form was dominant functional group occupying 47.66% and 91 species (71.09%) were in ESG I group, growing in stable environmental coast. Also, R/P, C/P, and (R+C)/P were 2.14, 0.51, and 2.66, respectively showing temperate and mixed flora. Biomass and density of E.bicyclis were $23.74kg\;m^{-2}$ and 64 fronds $m^{-2}$. Twelve seaweeds and 83 animal species (15 Annelida, 25 Mollusca, 34 Arthropoda, 3 Echinodermata, and 6 others) were observed from 23 holdfasts and Ericthonius pugnax was dominant taxon having 538 (43.11%) of 1,248 animal individuals. These results indicate that E.bicyclis is a keystone species showing very important ecological role. In conclusion, the number of seaweeds increased because of intensive research and dominance of coarsely branched form and ESG I group seaweeds, representing that environmental condition of Dokdo is still intact.

• The Korean Journal of Zoology
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• v.4 no.1
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• pp.13-20
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• 1961

우리나라 서해안인 경기도 부천군 선재도에서 산출되는 이매구류의 출현 빈도 분포 상태를 1959년 8월부터 1960년 10월에 걸쳐서 생태학적인 조사를 하였다. 1) Sampling 은 motor pump를 사용하여 원하는 깊이에 따라 각각 plankton을 채집하여 현미경으로 고나찰하여 KArvae 의 수를 조사하였다. 2) 각 stage의 larvae을 측정한 결과, 가장 어린 것은 60$\times$54$\mu$이었고, 가장 큰 것 은 320$\mu$336$\mu$이었다. 3) 이매구의 larvae 들은 수중에서 불규칙하게 분포하였다. 온도의 상승에 따라서 larvae의 분포는 증가되고, 대체로 온도가 하강함에따라서는 감소되었다. 4) 어린 stage의 larvae 수는 7월-9월 에 걸쳐 출현빈도가 높았다. 이것은 이시기가 선재도에 있어서는 이매구류의 산란시기라고 생각된다. 5) 8월-9월에 걸쳐서 대형의 alrvae의 출현빈도가 감소되는데, 이것은 larvae가 착생되었기 때문이라 생각된다.

• Journal of fish pathology
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• v.3 no.1
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• pp.21-25
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• 1990

In inland aquaculture, a lot of fishes often died cause of touch of L. carteri which is attached on the net cage. In this works, the experiment were carried out on classification of species, toxin test, and extermination with some chemicals. A bryozoa from net cage in lake Okjeong is classified into the Phylactolaemata, Lophopodella carteri Hyatt. A bryozoa broke out firstly on the 30th of June with water temperature up to $31^{\circ}C$ and it reattached on the net with water temperature below $30^{\circ}C$. Size of bryozoa colony is about $0.8{\times}0.6{\sim}1.7{\times}1.5cm$. Water column of attachment was 0~5m and the peak is 2~3m. In toxin test on the israeli carp, goldfish and catfish touched with bryozoa for 1 minute at $25^{\circ}C$ of water temperature, a dead fish appeared at 20 minutes after touched. Mortality was 90% for israeli carp and 100% for goldfish at 100 minuties after touched, but catfish was not died at all. It was supposed that the toxin is from nematocyst being around tentacles and this toxin act a deadly poison on a israeli carp and goldfish. In extermination test, the bryozoa treated with 300ppm of formalin, 5% of sodium chloride, 5ppm of malachite green, 200ppm of potassium permanganate, 1000ppm of potassium iodide, 10ppm of DDVP for minute respectively, all of them were not effected.