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http://dx.doi.org/10.13047/KJEE.2018.32.6.591

Ecological Characteristic of Clithon retropictus inhabitating in Yeoncho River in Southern Coastal Area  

Lee, Soo-Dong (Dept. of Landscape Architecture, Gyeongnam National University of Science and Technology)
Kim, Mi-Jeong (Division of Ecological Conservation, Bureau of Ecological Research, National Institute of Ecology)
Kim, Ji-Suk (Jungbo Parks & Landscape Management Office)
Publication Information
Korean Journal of Environment and Ecology / v.32, no.6, 2018 , pp. 591-602 More about this Journal
Abstract
Clithon retropictus has been designated as an endangered wildlife Class II due to its high value as a biological indicator species capable of judging environmental quality such as salinity, water flow, and ground conditions. However, basic research on its physiological and ecological characteristics is still lacking. As such, this study intended to examine the impact of environmental conditions such as salinity and soil particle size on the size and density of Clithon retropictus at the Yeoncho river estuary. The investigation of the salinity, which is a key variable that affects the distribution of organisms in the estuary, showed that Clithon retropictus could grow at a salinity ranging from 0#x2030; (freshwater) to 25‰ (brackish water). The coarse gravel (19-75mm) tended to increase nearer the upper stream (under the Yeoncho weir), while the proportion of particles smaller than sand (less than 19mm) increased toward the downstream. The population and the size of the individuals decreased rapidly in the downstream where water stagnated near the Yeoncho weir, and the salt water joined. The results indicated that Clithon retropictus had a high tolerance to salinity, but the adaptability was weaker toward the extremes since the population, and the size tended to decrease as the salinity increased. The correlation analysis revealed that both salinity and soil particle size affected the population and individual size. The correlation between the individual size and salinity was -0.242 (P <0.01), indicating that the size decreased with increasing salinity. The correlation between individual size and coarse gravel having a particle size of 19mm or more was 0.420 (P <0.01), indicating that the size increased with increasing the particle size.
Keywords
ESTUARY; SALINITY; PARTICLE SIZE; RANGE OF TOLERANCE;
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Times Cited By KSCI : 3  (Citation Analysis)
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