We examined whether an artificial levee constructed on prime amphibian habitat influences fragmentation. Four
different sites on both sides of a levee in the Civilian Control Zone(CCZ) were probed. Sites 1 and 2 are rice paddies
on one side of the levee, and Site 3 is the stream that locates in the same side. All the three sites have water conditions
of seasonal variance. On the other side, Site 4 consists of rice paddies with a stable condition of water supply, irrigated
through a canal. The research sites were frequented and the frog populations were closely monitored. The
investigation identified five species. Pelophylax nigromaculatus was the most frequent (n=295), followed by Hyla
japonica (n=220) and Glandirana rugosa (n=124). Three Bufo gargarizans and eight Rana coreana were also found.
The amphibians, however, were found to relocate themselves according to water condition to rice paddies or stream
only within one side of the levee. Despite having ample sources of water and foods, Site 4 lacked large populations of
frogs, even when droughts came. Both the species dominance index and the richness index indicated a more favorable
living condition of the one side of the levee (Sites 1 and 2) over the other.