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http://dx.doi.org/10.7850/jkso.2019.24.1.106

Spatio-temporal Distribution of Macrozoobenthos in the Three Estuaries of South Korea  

LIM, HYUN-SIG (Department of Marine and Fisheries Resources, Mokpo National University)
LEE, JIN-YOUNG (Department of Marine and Fisheries Resources, Mokpo National University)
LEE, JUNG-HO (Department of Marine Biotechnology, Anyang University)
SHIN, HYUN-CHUL (Faculty of Marine Technology, Chonnam National University)
RYU, JONGSEONG (Department of Marine Biotechnology, Anyang University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.24, no.1, 2019 , pp. 106-127 More about this Journal
Abstract
This study aims to understand spatio-temporal variations of macrozoobenthos community in Han River (HRE), Geum River (GRE), and Nakdong River estuaries (NRE) of Korea, sampled by National Survey of Marine Ecosystem. The survey was seasonally performed at a total of 20 stations for three years (2015-2017). Sediment samples were taken three times with van Veen grab of $0.1m^2$) areal size and sieved through a 1 mm pore size mesh on site. A total of 1,008 species were identified with 602 species in HRE, 612 in GRE, and 619 in NRE, showing similar number of species between estuaries. Mean density was $1,357ind./m^2$, showing the high in NRE ($1,357ind./m^2$), mid in GRE ($1,357ind./m^2$), and low in HRE ($1,127ind./m^2$). Mean biomass was $116.8g/m^2$, showing similar variations to density ($174.2g/m^2$ in NRE, $129.0g/m^2$ in GRE, $49.0g/m^2$ in HRE). Polychaeta dominated in number of species and density in three estuaries. Biomass-dominated taxon was Mollusca in HRE and GRE, and Echinodermata in NRE. Polychaetous species dominated all three estuaries over 4% of density, such as Dispio oculata, Heteromastus filiformis and Aonides oxycephala in HRE, Heteromastus filiformis and Scoletoma longifolia in GRE, and Pseudopolydora sp. and Aphelochaeta sp. in NRE, showing various density between estuaries. Community structure was determined by various environmental variables among estuaries such as mean grain size and sorting (HRE), salinity and mean grain size (GRE), and salinity, dissolved oxygen, loss on ignition and mud content (NRE). Our study demonstrates the application of different measures to manage ecosystems in three estuaries. HRE needs to alleviate sedimentary stressors such as sand mining, land-filling, dike construction. Management of GRE should be focused on fresh water control and sedimentary stressors. In NRE, monitoring of dominant benthos and process study on hypoxia occurrence in inner Masan Bay are necessary.
Keywords
Macrozoobenthos; Community structure; Han River estuary; Geum River estuary; Nakdong River estuary; National survey of marine ecosystem;
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Times Cited By KSCI : 4  (Citation Analysis)
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