4대강 보 건설에 따른 실지렁이류 (Aquatic Oligochaeta) 서식분포 특성 비교

This study examined the habitat distribution characteristics of Aquatic Oligochaeta according to the construction of weirs in the four major rivers in South Korea. The area was investigated 10 times from March to October in 2018 and a total of 18 species and 35,390 ind. m-2 were sampled. The dominant species by number was Limnodrilus hoffmeisteri (77.1%) and the subdominant species was Branchiura sowerbyi (9.5%). A total of 32.418 g m-2 dry weight was analyzed. The correlation analysis showed that the number of Aquatic Oligochaeta individuals correlated with the sediment depth, clay ratio, silt ratio, sand ratio, cobble ratio, pebble ratio, pH and TOC mg L-1. Specifically, the clay ratio and sediment depth were associated with increases in the number of individuals. The total organic carbon (TOC) increased from March to October and, conversely, the number of individuals tended to decrease.