Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Spatio-temporal Variation and Evaluation of Benthic Healthiness of Macrobenthic Polychaetous Community on the Coast of Ulsan

울산 연안 해역 저서다모류 군집의 시·공간 변동 및 저서건강도 평가

  • Jeong, Bong Geun (Faculty of Marine Technology, College of Fisheries and Ocean Sciences, Chonnam National University) ;
  • Shin, Hyun Chool (Faculty of Marine Technology, College of Fisheries and Ocean Sciences, Chonnam National University)
  • 정봉근 (전남대학교 수산해양대학 해양기술학부) ;
  • 신현출 (전남대학교 수산해양대학 해양기술학부)
  • Received : 2018.09.07
  • Accepted : 2018.11.08
  • Published : 2018.12.30
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Abstract

This study was carried out to investigate benthic sedimentary environments and benthic polychaetous communities on the coast of Ulsan, located on the southern East Sea of Korea. This survey was conducted at 15 stations, four times seasonally in January, April, July and October 2016. From the coast to the outer sea, surface sediments turned into fine grained sediments. There were complex coarse-grained sedimentary facies in various forms in the coastal zones while those with mud facies were found in the offshore zone. Organic matter content (LOI) and sulfide amount (AVS) recorded extremely high values, and increased from the coast to the outer sea, showing a similar trend to mud content with depth. The benthic polychaetous community revealed a mean density of $525ind./m^2$, and the total species number of species was 84. The major dominant polychaetous species were Magelona japonica, Lumbrineris longifolia and Heteromastus filiformis throughout the four seasons. Magelona japonica was concentrated predominantly in shallow coastal areas, but was present in all the regions of the survey area. Lumbrineris longifolia showed higher density in offshore regions more than 30 m deep, whereas H. filiformis showed higher density in coastal areas less than 30 m in depth. As a result of cluster analysis, the study area was divided into three ecological areas according to species composition, such as the northern coastal area between Ulsan PortOnsan Port, the southern area around Hoeya River and the outer sea area. Benthic environments in the study area, as determined by AMBI and BPI index, maintained a healthy condition in all four seasons with the AMBI at a level above GOOD and BPI at a level above FAIR. As organic matter accumulation continues to take place in the Ulsan coastal area, it is essential that detailed research activities continue to be carried out and ongoing monitoring be maintained.

Keywords

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