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Marine Pollution Bulletin
Vol. 124 (1), 2017, Pages: 411-420

Seasonal influence of scallop culture on nutrient flux, bacterial pathogens and bacterioplankton diversity across estuaries off the Bohai Sea Coast of Northern China

Yaodong He, Biswarup Sen, Junyang Shang, Yike He, Ningdong Xie, Yongfeng Zhang, Jianle Zhang, Zackary I.Johnson, Guangyi Wang

College of Pharmacy, Pusan National University, Busan 609-735, Republic of Korea.

Abstract

In this study, we investigated the environmental impacts of scallop culture on two coastal estuaries adjacent the Bohai Sea including developing a quantitative PCR assay to assess the abundance of the bacterial pathogens Escherichia coli and Vibrio parahaemolyticus. Scallop culture resulted in a significant reduction of nitrogen, Chlorophyll a, and phosphorous levels in seawater during summer. The abundance of bacteria including V. parahaemolyticus varied significantly across estuaries and breeding seasons and was influenced by nitrate as well as nutrient ratios (Si/DIN, N/P). Bacterioplankton diversity varied across the two estuaries and seasons, and was dominated by ProteobacteriaCyanobacteriaActinobacteriaBacteroidetes. Overall, this study suggests a significant influence of scallop culture on the ecology of adjacent estuaries and offers a sensitive tool for monitoring scallop contamination.

Keywords: Quantitative PCR, Bacterial pathogens, Bacterial communities, Scallop culture.

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