Ecology and Resilient Infrastructure ISSN:2288-8527(Online) 응용생태공학회 논문집

We assessed the microhabitat conditions of three fish species (black shinner Pseudopungtungia nigra, striped shinner Pungtungia herzi, Korean shinner Coreoleuciscus splendidus) considering various stream order in the Geumgang River Basin. A total of 1,275 individuals were collected from 19 sites. And the microhabitat condition was assessed measuring flow velocity, water depth and substrate size at each site. The highest relative frequencies for P. herzi, C. splendidus and P. nigra were calculated 100% (n = 310), 78.9% (n = 784) and 47.3% (n = 181) respectively. P. herzi appeared in all streams, irrespective of their stream order; however, appearance in streams with the 2^nd order or lower was found to be scarcer than in the ones with the 3^rd order or higher. On the other hand, P. nigra and C. splendidus didn’t appear in streams with the 2^nd order or lower. When it comes to P. nigra, the ones with 7 to 8 cm in length most frequently appeared. They inhabited streams, mainly, with 0.2 to 0.4 m s^-1 and 0.5 m in velocity and water depth, respectively. The three species all preferred runs as types of habitats with lots of coarse gravels-cobbles. P. herzi, the ones with 5 cm or shorter in length most frequently appeared. They inhabited streams, mainly, with 0 to 0.3 m s^-1 and 0.4 m in velocity and water depth, respectively. C. splendidus with 7 to 8 cm in length occupied the majority of them. They appeared in streams, mainly, with 0.9 m s^-1 or higher and 0.3 m in velocity and water depth.