| Title |
Spatial Distribution of Benthic Macroinvertebrates at Three River Weirs in The Namhan River |
| Authors |
권용주 ( Yongju Kown ) ; 김진영 ( Jin-young Kim ) ; 김필재 ( Piljae Kim ) ; 김정우 ( Jungwoo Kim ) ; 민정기 ( Jeong-ki Kim ) ; 공동수 ( Dongsoo Kong ) |
| DOI |
https://doi.org/10.15681/KSWE.2020.36.1.36 |
| Keywords |
Benthic macroinvertebrates; Namhan River; Spatial distribution; Weir |
| Abstract |
Three large scale weirs were constructed 2010 - 2011 in the Namhan river, Korea. The purpose of this study was to investigate the spatial distribution of benthic macroinvertebrates and the influence of environmental factors at the weirs 2014 - 2015. The number of species was higher in the riparian zone than in the transition or the limnetic zone. This seems to be because of the diversification of microhabitats and food sources according to the development of littoral zones. From the riparian zone to the limnetic zone, the individual abundance proportion of gathering collectors among functional feeding groups decreased, and that of filtering collectors increased. In the limnetic zone, sprawlers and climbers among habitat orientation groups decreased, and burrowers increased. This means that coarse particulate organic matter originated from land or riparian zone was transformed to fine particulate organic matter in the limnetic zone. Asian clam (Corbicula fluminea) and chironomids were dominant species based on individual abundance. Asian clam, a major taxon considering biomass, was abundant toward the limnetic zone. This is becasue of the shallow depth, suitable water current, slightly coarse substrate, and good water quality. There was no significant relationship between the water quality and the characteristics of the benthic macroinvertebrate community because the water quality was spatially not heterogenous. The more influential factors for benthic community were physical factors, especially water depth. Water depth showed a markedly significant correlation with Shannon-Weaver’s species diversity (r=-0.90), Margalef’s species richness (r=-0.82), and McNaughton’s dominance (r=0.86). Water depth showed a positive correlation (r=0.68) with the Kong and Kim BMSI (Bentic Macroinverebrates Streambed Index), and this may be related to the coarse substrate of the limnetic zone. |