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정승진 ( Jeong Seung Jin ),유옥환 ( Yu Og Hwan ),서해립 ( Seo Hae Lib ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.2
N/A On the basis of monthly samples, we investigated the seasonal variation and feeding habits of amphipods inhabiting Zostera marina beds in Gwangyang Bay. Dominant species (>1% of the total number of amphipods) consist of 5 gammarids (Gammaropsis japonicus, Jassa slatteryi, Pontogenia rostrata, Atylus collingi and Ceinina japonica) and 1 caprellid (Caprella tsugarensis). Mean densities of amphipods varied from the highest of 63,148 ind. m-2 in May to the lowest of 1,247 ind. m-2 in September. G. japonicus and J. slatteryi dominated in summer whereas C. japonica in autumn and winter. C. japonica was found to be a carnivorous feeder consuming mainly harpacticoid copepods and unidentified crustaceans, whereas G. japonicus, J. slatteryi, and C. tsugarensis consumed both phytoplankton and detritus. Seasonal densities of amphipods were significantly related with the shoot standing crop of the eelgrass and its epiphyte. Also densities of amphipods displayed significant difference in related with the shoot density of the eelgrass among sampling stations. These results suggest that the biological interactions between the eelgrass and amphipods as well as between the carnivorous and the herbivorous amphipods may be important in the seasonal variation of amphipods inhabiting 2. marina beds.
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동중국해 음향 산란층내의 euphauiid (Euphausia pacifica) 밀도 추정
강돈혁 ( Kang Don Hyeog ),황두진 ( Hwang Du Jin ),서호영 ( Seo Ho Yeong ),윤양호 ( Yun Yang Ho ),서해립 ( Seo Hae Lib ),김용주 ( Kim Yong Ju ),신현출 ( Sin Hyeon Chul ),( Kohji Iida ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.6
N/A Hydroacoustic and open-closing zooplankton net survey were conducted to understand the characteristics of the sound scattering layer (SSL) and to estimate the density of an euphausiid (Euphausia pacifica) in the SSL, in the northwestern part of the East China Sea. The survey was carried out during July 6-9 2002 at 8 sampling stations for zooplankton. The virtual echogram technique was used to identify E, pacifica from all acoustic scatters. Mean volume backscattering strength difference (MVBS_(120kHz-38kHz)) and target strength equation for E. pacifica were derived from the Distorted-wave Born Approximation (DWBA) model. Although vertical migration of the SSL is similar to the general pattern, dispersion at qight shows some differences. Estimated mean 3density using acoustic data ranged from 20.4-22 1.4 mg/m over the whole depth, and 87.1-553.5 mg/m in the SSL. The density using the zooplankton net ranged from 0.2-362.4 mg/m3 and was not related to net deploying method. The results from the acoustic and net survey suggest that E. pacifica might be an important zooplankton community in the northwestern part of the East China Sea.
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