Table 12. 1^st dominant species status by survey site in Yangjaecheon

Site	March		July		September		November
	1st dominnant species (pollution index)	DI	1st dominnant species (pollution index)	DI	1st dominnant species (pollution index)	DI	1st dominnant species (pollution index)	DI
Juam bridge	Turbellaria (0.7)	0.66	Turbellaria (0.7)	0.80	Baetis fuscatus (1.8)	0.90	Asellus (2.3)	0.49
Bodo bridge	Chironomidae (3.4)	0.80	Chironomidae (3.4)	0.52	Baetis fuscatus (1.8)	0.89	Hydropsyche orientalis (0.4)	0.58
Daechi bridge	Chironomidae (3.4)	0.76	Hydropsyche orientalis (0.4)	0.68	Baetis fuscatus (1.8)	0.51	Hydropsyche orientalis (0.4)	0.67