Temporal occurrence patterns and habitat use of fish in the Mangyeong estuary on the western coast of Korea in 2003, before dike enclosure

Hwang, Sun Wan; Lee, Tae Won; Hwang, Hak Bin; Hwang, Sun Do

doi:10.1007/s12601-011-0024-9

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Estuarine fishes were predominantly juveniles of marine fishes, indicating the importance of the estuary as a nursery [27,46]. The dominance of juvenile fishes in our observations is in general agreement with other studies worldwide (e.g., [47][48][49][50]), as well as in Korea (e.g., [26,27,51]). The greater abundance of juveniles observed in this study indicated the strong dependence of species on the estuary for shelter, survival, and refuge from predators during early stages of their life cycle [48].…”

Section: Discussionsupporting

confidence: 92%

“…Although many studies have investigated the community structure of estuarine fishes worldwide, and the impacts of estuary weir on fish assemblage structures [15,[23][24][25], such studies are scarce in areas along the southern coast of Korea. Of the few, Hwang et al [26] have investigated temporal occurrence patterns of fishes in the western Mangyeong Estuary prior to construction of a seawall in 2010, completely enclosing its lower reaches. Park et al [27] also reported juvenile fish assemblage in the shallow sandy beach of the lower tip of the Nakdong River estuary.…”

Section: Introductionmentioning

confidence: 99%

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Fish Assemblage Structure Comparison between Freshwater and Estuarine Habitats in the Lower Nakdong River, South Korea

Park

Riedel²,

et al. 2020

JMSE

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Variabilities of biological communities in lower reaches of urban river systems are highly influenced by artificial constructions, alterations of flow regimes and episodic weather events. Impacts of estuary weirs on fish assemblages are particularly distinct because the weirs are disturbed in linking between freshwater and estuarine fish communities, and migration successes for regional fish fauna. This study conducted fish sampling at the lower reaches of the Nakdong River to assess spatio-temporal variations in fish assemblages, and effects of estuary weir on structuring fish assemblage between freshwater and estuary habitats. In total, 20,386 specimens comprising 78 species and 41 families were collected. The numerical dominant fish species were Tachysurus nitidus (48.8% in total abundance), Hemibarbus labeo (10.7%) and Chanodichthys erythropterus (3.6%) in the freshwater region, and Engraulis japonicus (10.0%), Nuchequula nuchalis (7.7%) and Clupea pallasii (5.2%) in the estuarine site. The fish sampled were primarily small species or the juveniles of larger species at the estuary region, while all life stages of fishes were observed at the freshwater habitats. The diversity patterns of fish assemblages varied greatly according to study site and season, with higher trends at estuarine sites during the warm-rainy season. No significant difference in diversity between freshwater and estuarine sites during the cold-dry season were found. Multivariate analyses of fish assemblage showed spatial and seasonal differences of assemblage structures. Higher effects of between-site variability but not within seasonal variability at each site were observed. Variations in assemblage structures were due to different contributions of dominant species in each habitat. Common freshwater species characterized the fish assemblage in the freshwater region, while marine juveniles were significantly associated with the estuarine habitat. The results from the ecological guild analyses showed distinct ecological roles for freshwater and marine species, and overlapping roles for fish sampled at the fishways. The lower reaches of the Nakdong River are an important ecosystem for both freshwater and marine juveniles. Nakdong River estuarine residents and migrant fishes, however, have been negatively affected by the construction of the weir (gravity dam), due to the obstruction to migration from and to freshwater habitats. Conservation and management policies aimed at minimizing anthropogenic influences on estuary ecosystems should focus on evaluating ecological functions of estuary weirs.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Fish Assemblage Structure Comparison between Freshwater and Estuarine Habitats in the Lower Nakdong River, South Korea

Park

Riedel²,

et al. 2020

JMSE

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“…Chaeturichthys stigmatias, C. joyneri, R. beniteguri, P. olivaceus, and O. kenojei were the most abundant species (Table 2). These five species are known to be demersal and coastal migratory fish (Hwang et al, 2011;Lee and Hwang, 1995), some of which are important in coastal fisheries. Although the total number of species was generally comparable to that obtained in previous studies, despite using different types of fishing gear (e.g.…”

Section: Discussionmentioning

confidence: 99%

Impact of Sand Extraction on Fish Assemblages in Gyeonggi Bay, Korea

Hwang

Lee

Choi

et al. 2014

Journal of Coastal Research

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3 10 6 m 3 of marine sand was extracted by the construction industry from Gyeonggi Bay, which is an area within the coastal waters off the Taean District of Korea. The goal of our study was to compare the catches and assemblage structure of fish in this sand mining area (SMA) with those of two other nonmining areas (NMAs) in the bay. An otter trawl was used to obtain fish samples in each area. Both cluster analysis and nonmetric multidimensional scaling of the species composition in the sampled areas showed a higher similarity between the two NMAs than between the NMAs and the SMA. Furthermore, the SMA had significantly lower species richness (R1), species diversity (H 0 ), and fish abundance compared with the two NMAs. These results could be associated with bottom disturbance related to the mining of seabed sediments. In conclusion, we confirm that sand mining processes directly influence the Gyeonggi Bay sea floor ecosystem and have a continuous effect on the assemblage of fish in this ecosystem.

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Comparative fish community structure among different types of enclosures of estuarine environments

Hwang

Choi

2022

Aquaculture and Fisheries

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Temporal occurrence patterns and habitat use of fish in the Mangyeong estuary on the western coast of Korea in 2003, before dike enclosure

Cited by 5 publications

References 8 publications

Fish Assemblage Structure Comparison between Freshwater and Estuarine Habitats in the Lower Nakdong River, South Korea

Fish Assemblage Structure Comparison between Freshwater and Estuarine Habitats in the Lower Nakdong River, South Korea

Impact of Sand Extraction on Fish Assemblages in Gyeonggi Bay, Korea

Comparative fish community structure among different types of enclosures of estuarine environments

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