Responses of fish assemblage structure to large-scale weir construction in riverine ecosystems

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  • Hyunbin Jo, Pusan National University
  • ,
  • Erik Jeppesen
  • Marc Ventura, Spanish National Research Council, Spain
  • Teresa Buchaca, Spanish National Research Council, Spain
  • Jeong-Soo Gimb, Pusan National University
  • ,
  • Ju-Duk Yoon, National Institute of Ecology
  • ,
  • Dong-Hwan Kim, National Institute of Ecology, Korea, Republic of
  • Gea-Jae Joob, Pusan National University, Korea, Republic of

Worldwide, increasing amounts of dams and weirs have been established in rivers in recent decades, often with drastic effects on their ecosystems. Between late 2009 and 2011, 16 large-scale dams were built in the main channels of the four largest rivers in South Korea, eight of these along the main channel of Nakdong River (300 km, 520 km in total). We studied the effect of these constructions on the fish community in the riparian zone based on intensive fish field surveys conducted in the littoral zone during 2007–2017, analysis of fishermen's catch data and molecular analysis of the diet of the keystone species, largemouth bass (Micropterus salmoides). Our results, based on RDA and GLM analyses, showed that environmental characteristics and fish species composition changed significantly with dam construction. Total fish abundance and biomass decreased after the start of the weir construction and fish richness decreased with time. The abundance and biomass of exotic fish decreased during construction but recovered afterwards, leading to higher proportions of exotics. Dominance and Shannon indices did not change significantly from before to after construction, while the Evenness index showed a significant decreasing trend. A comparison of the diet composition of largemouth bass showed decreasing genetic variation after construction. The changes in Functional Feeding Group (FFG) of the benthic communities at the study sites did not coincide with FFG changes in the prey items of largemouth bass, indicating a transition in feeding mode from before to after construction. In conclusion, the endemic and native fish species were most sensitive and showed lower resilience to disturbance by the large-scale dam construction than the translocated and exotic species, and the lake-like ecosystems after construction markedly improved the competitive capacity of these exotic fish over the native and endemic species in the riparian zone of the river.

Original languageEnglish
JournalScience of the Total Environment
Volume657
Pages (from-to)1334-1342
Number of pages9
ISSN0048-9697
DOIs
Publication statusPublished - 2019

    Research areas

  • BASS, COMMUNITY, CONSERVATION, DIVERSITY, ECOLOGY, EVOLUTIONARY GENETICS, Fish species composition, Functional feeding group, GLM analysis, Genetic variability, HABITAT, IMPOUNDMENT IMPACT, RDA analysis, RESERVOIR, Resilience, Riparian zone, SIZE

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