The first name of the first author on the first page of the article has been spelled wrong. The correct full name is "Sung-Won Hwang" instead "Sung-Wong Hwang".
-Nature-like fishways, designed to mimic a small natural stream, have been widely used in river restoration projects as well as in rivers with dams and weirs. Because they are built with diverse natural materials similar to those in natural streams, we aimed to estimate the self-purification ability of nature-like fishways. Monthly sampling was conducted at inlet and outlet points of two nature-like fishways in Korea: the Baekjae and Sejong fishways. Two artificial fishways and main river channels were also evaluated to be used as references. Suspended solids (SS), chlorophyll a (Chl. a), and plankton abundances were measured. A significant reduction in plankton abundances and decrease in SS and Chl. a were observed in nature-like fishways, and no significant changes were observed in concrete artificial fishways and main river channels. In Baekjae and Sejong fishways, average 28.2% and 14.9% of the SS concentrations were reduced, respectively. The Chl. a concentration also significantly decreased (44.8% and 29.8% in Baekjae and Sejong fishways, respectively). A decreasing pattern was more apparent in the Baekjae fishway, which is longer and has a slower water velocity. The rate of decrease was higher when SS and Chl. a concentrations were high at the inlet points. Thus, we confirmed that particulate organic matters could be reduced in nature-like fishways. However, the direct cause and purification process mechanisms in them could not be clearly identified. Further studies should examine the biological and chemical mechanisms in fishways, allowing us to estimate their capacity for self-purification.Keywords: self-purification / phytoplankton / zooplankton / suspended solid / chlorophyll a Résumé -Changements dans les matières organiques particulaires et les populations de plancton dans les passes de type « rivière artificielle » : rôle des passes de type « rivière artificielle » dans la qualité de l'eau. Des passes de type « rivière artificielle », conçues pour imiter un petit ruisseau naturel, ont été largement utilisées dans les projets de restauration des rivières ainsi que dans les rivières avec barrages et seuils. Parce qu'elles sont construites avec divers matériaux naturels semblables à ceux des cours d'eau naturels, nous avons cherché à estimer l'aptitude à l'auto-épuration des passes de type « rivière artificielle ». Des échantillonnages mensuels ont été effectués aux points d'entrée et de sortie de deux passes de type « rivière artificielle » en Corée : les passes à poissons Baekjae et Sejong. Les deux passes artificielles et les secteurs principaux de rivières ont également été évalués pour servir de référence. On a mesuré les solides en suspension (SS), la chlorophylle a (Chl. a) et les abondances du plancton. Une réduction significative de l'abondance du plancton et une diminution des SS et de Chl. a ont été observées dans les passes de type « rivière artificielle » et aucun changement significatif n'a été observé dans les passes artificielles et les secteurs principaux de la rivière. Dans ...
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