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Benthic Environments and Macrobenthic Polychaete Community Structure in the winter of 2005-2006 in Gamak Bay, Korea  

Yoon, Sang-Pil (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Kim, Youn-Jung (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Jung, Rae-Hong (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Moon, Chang-Ho (Department of Oceanography, Pukyong National University)
Hong, Sok-Jin (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Lee, Won-Chan (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Park, Jong-Soo (Marine Environment Research Team, National Fisheries Research & Development Institute (NFRDI))
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.13, no.1, 2008 , pp. 67-82 More about this Journal
Abstract
This study was performed to investigate changes in benthic environment and macrobenthic polychaete communities in Gamak Bay where various environmental quality improvement projects have been implemented in recent years. Field surveys were carried out in February, 2005 and February, 2006 and twenty stations were selected to explore whether or not there were between-year differences in biotic and abiotic variables. Of 10 environmental variables measured, only three variables including dissolved oxygen (DO), total ignition loss (IL), acid volatile sulfide (AVS) showed significant between-year differences. Specifically, IL and AVS were, on average, 1.5 and 3 times lower in 2006 compared to those in 2005, respectively, which was more pronounced in the northern part of the bay. A total of 95 polychaete species was sampled from the two sampling occasions. Between-year differences in the number of species, abundance, and diversity were varied from place to place. In the northern part of the bay, fewer species were found in 2006 rather than in 2005, but diversity increased in 2006 due to the reduction in dominance of a few species. On the contrary, in the central part of the bay, the number of species, abundance and diversity prominently increased in 2006. In the southern part of the bay, all the biological indices maintained similarly during the two years. Dominant species in 2005 were such opportunistic or organic pollution indicator species as Lumbrineris longifolia, Capitella capitata, Mediomastus californiensis, Pseudopolydora paucibranchiata, etc. and most of them were mainly distributed in the northern part of the bay and in the proximity of it. In 2006, however, Euchone alicaudata, L. longifolia, Paraprionospio pinnata, Flabelligeridae sp., etc. were dominant and distributed mainly in the central part of the bay. Multivariate analyses showed that the whole polychaete community could be divided into 5 groups reflecting the geographical positions of the sampling stations and temporal variation particularly in the northern part of the bay. According to the results of BIO-ENV procedure, TOC (${\rho}=0.52$) and AVS (${\rho}=0.49$) as a single variable best explained the polychaete community structure. The best combination was made by such variables as TOC, AVS, sorting coefficient, and water temperature (${\rho}=0.60$). In conclusion, between-year differences in biotic and abiotic variables imply that recent efforts for the environmental improvement produced positive influences on the benthic environment of Gamak Bay, particularly the northern part of the bay.
Keywords
Organic Enrichment; Acid Volatile Sulfide; Environmental Quality Improvement; Polychaete; Gamak Bay;
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Times Cited By KSCI : 2  (Citation Analysis)
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