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http://dx.doi.org/10.7837/kosomes.2016.22.6.694

The Community Structure of Macrobenthic Assemblages in the Taehwa River Estuary, Ulsan, Korea  

Kim, Hyung-Chul (Marine Environment Research Division, National Institute of Fisheries Science)
Choi, Byoung-Mi (Korea Benthos Research Center, Co. Ltd.)
Jung, Rae-Hong (Marine Environment Research Division, National Institute of Fisheries Science)
Lee, Won-Chan (Marine Environment Research Division, National Institute of Fisheries Science)
Yun, Jae-Seong (Korea Benthos Research Center, Co. Ltd.)
Seo, In-Soo (Korea Benthos Research Center, Co. Ltd.)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.6, 2016 , pp. 694-707 More about this Journal
Abstract
This study investigated the community structure of macrobenthic assemblages in the Taehwa River Estuary, Ulsan, Korea. Macrobenthos were collected with a Van Veen Grab Sampler during February and November 2012. The total species number and mean density were $176species/9.6m^2$ and $1,992inds./m^2$, respectively. Polychaetes were the most dominant faunal group in terms of species (91 species) and abundance ($1,463inds./m^2$). The major dominant species were polychaetes Minuspio japonica ($609{\pm}1,221inds./m^2$), Hediste japonica ($174{\pm}318inds./m^2$), Tharyx sp.1 ($106{\pm}283inds/m^2$), Lumbrineris longifolia ($79{\pm}207inds./m^2$), bivalve Theora fragilis ($114{\pm}272inds./m^2$) and amphipod Grandidierella japonica ($88{\pm}223inds./m^2$). Based on community statistics (cluster analysis and non-metric multidimensional scaling (nMDS) ordination), the macrobenthic community was divided into three station groups. Group I(freshwater dominated stations 2-6 with coarse sediment) was characterized by a high abundance of polychaetes Minuspio japonica, Hediste japonica, Capitella capitata, Pseudopolydora kempi, amphipods Grandidierella japonica and Apocorophium acutum. Group II (ecotone, stations 7-9 with mixed sediment) was numerically dominated by bivalve Theora fragilis, polychaetes Cirriformia tentaculata, Tharyx sp.1, Lumbrineris longifolia and Chaetozone sp. Finally, Group III (seawater dominated stations 10-12 with fine sediment) was characterized by a high density of polychaete Magelona japonica. These results showed that changes in salinity gradient and sedimentary characteristics were the main factors behind spatial changes in the macrobenthic communities of the Taehwa River Estuary.
Keywords
Macrobenthos; Community structure; Estuary; Taehwa River; Ulsan;
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Times Cited By KSCI : 9  (Citation Analysis)
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