The impact of heavy metal pollution gradients in sediments on benthic macrofauna at population and community levels |
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Authors: | Ryu Jongseong Khim Jong Seong Kang Seong-Gil Kang Daeseok Lee Chang-Hee Koh Chul-Hwan |
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Institution: | a Office of Policy Research, Korea Ocean Research & Development (KORDI), Ansan, P.O. Box 29, Seoul 425-600, Republic of Korea b Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-713, Republic of Korea c Maritime & Ocean Engineering Research Institute (MOERI)/Korea Ocean Research & Development Institute (KORDI), Daejeon 305-600, Republic of Korea d Department of Ecological Engineering, Pukyong National University, Busan 608-737, Republic of Korea e Department of Environmental Engineering and Biotechnology, Myongji University, Yongin, Gyeonggi-do 449-728, Republic of Korea f School of Earth and Environmental Sciences (Oceanography), Seoul National University, Seoul 151-742, Republic of Korea |
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Abstract: | The effect of sediment pollution on benthos was investigated in the vicinity of a large sewage treatment outflow at Incheon North Harbor, Korea. Animal size, vertical distribution and standard community parameters were analyzed along a 3 km transect line (n = 7). Univariate parameters showed a general trend of increasing species diversity with increasing distance from the pollution source. Multi-dimensional scaling analysis led to the clear separation of 3 locational groups, supporting gradient-dependent faunal composition. The innermost location was dominated by small sub-surface dwellers while the outer locations by large mid to deep burrowers. Looking for the size-frequency distribution, most abundance species (Heteromastus filiformis) showed the presence of larger size animals with increasing proximity to the pollution source. Meanwhile, species-specific vertical distributions, regardless of the pollution gradient, indicated that such shifts were due to species replacement resulting from a higher tolerance to pollutants over some species. |
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Keywords: | Vertical distribution Animal size Pollution gradient Heavy metals Macrozoobenthos Interspecific competition |
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