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Changes in Macrobenthic Community Structure on Gunsan Tidal Flat after the Closing of the Saemangeum 4th Dyke
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  • Journal title : Ocean and Polar Research
  • Volume 30, Issue 4,  2008, pp.497-507
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2008.30.4.497
 Title & Authors
Changes in Macrobenthic Community Structure on Gunsan Tidal Flat after the Closing of the Saemangeum 4th Dyke
Koo, Bon-Joo; Shin, Sang-Ho; Woo, Han-Jun; Kim, Eun-Soo; Je, Jong-Geel;
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With the reduction of tidal currents by the closing of the Saemangeun 4th dyke, sedimentary environments on the Gunsan tidal flat, the nearest inner flat from the 4th dyke, has been severely changed, which might affect macrobenthic assemblages on the habitats. In order to investigate changes in macrobenthic community structure on Gunsan tidal flat, field surveys were seasonally conducted at seven stations from April 2002 to November, 2005. Sedimentary facies on the study area were shifted into muddominant facies. The fine sediment has been greatly deposited on the tidal flat with accumulation of organic materials after closing the water passage of 4th dyke section. These drastic variations in environments gave rise to change in macrobenthic community structure. Since the closure of the 4th dyke, the number of species of macrobenthos has gradually decreased. And the filter feeders and sand-favored species such as Urothoe convexa, Macrophthalmus dilatatus, Umbonium thomasi, and Mactra veneriformis have been replaced by the deposit feeders such as Macrophthalmus japonicus and Ilyoplax pingi. MDS ordination based on Bray-Curtis similarity from forth-root transformed species abundance data showed that the macrobenthic communities have passed through three succession stages from 2002 to 2005. During the third stage of 2005 opportunistic species such as Prionospio japonica, Heteromastus filiformis and Sinocorophium sinensis increased in population on the tidal flat.
Macrobenthic community;sediment deposition;tidal flat;4th dyke;Saemangeum;
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