牛津川近隣の農業用水路におけるツチフキの産卵環境

抄録

The spawning habitat of the endangered Chinese false gudgeon, Abbottina rivularis, was investigated in an irrigation channel near the Ushizu River, northern Kyushu Island, Japan, from March to May, 2012. Sixteen nest sites were identified from early April to mid-May. A generalized mixed liner model incorporating nest presence/absence data and several environmental parameters, disclosed the environmental characteristics of the spawning habitat of the species, indicating the probability of occurrence of a nest with distance from the channel bank, current velocity and emergent plants. The results suggested that the maintenance of low current velocity and few or no emergent plants near the banks were most important for conservation of the spawning habitats of A. rivularis.