| Title: | Biodeposition of oysters in an urbanized bay area alleviates the black-malodorous compounds in sediments by altering microbial sulfur and iron metabolism |
| Author(s): | Yan Q; Song J; Zhou J; Han Y; Cai Z; |
| Address: | "School of Life Science, Tsinghua University, Beijing 100083, PR China. The Institute for Ocean Engineering, Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen 518055, Guangdong Province, PR China. The Institute for Ocean Engineering, Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen 518055, Guangdong Province, PR China. Electronic address: caizh@sz.tsinghua.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2021.152891 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "The occurrence of the 'black-malodorous phenomenon' in a waterbody is a clear sign of a highly eutrophic bay, the formation of which is associated with microbial sulfur and iron metabolism in the sediments. Oyster farming restoration has been widely studied as an important method for treating eutrophication and related ecological problems. However, few studies focus on the ecosystem-level consequences of oyster farming concerning microbial sulfur and iron cycles in the sediment. Here, we compared the physicochemical features and microbial functions of oyster farms with those of reference areas using the Geochip5.0 technique. Our results showed a significant reduction of acid volatile sulfide (AVS) content associated with oyster farming, thus alleviating the black-malodorous status of Shenzhen Bay in China. Oyster farming created loose and porous sedimentary structures and stimulated the oxidation of black-odorous compounds. Moreover, we observed that the introduction of oysters changed microbial biodiversity significantly based on gyrB gene structure, with typical sulfur- and iron-cycling microbes being enriched. We also demonstrated that microbial abilities involved in sulfur and iron metabolism were greatly increased in oyster farming areas compared with reference areas. Under such circumstances, some cascading processes (AVS uptake and rates of organic matter turnover) were improved, which eventually contributed to black odor reduction. From the microecological perspective, we conclude that the biodeposition of oysters was the key factor for water retention and improvement of microbial metabolism. This study suggests that biodeposition shapes the microbial functional communities in adjacent territories and presumably alleviates the black-malodorous compounds in sediments" |
| Keywords: | Animals Geologic Sediments/chemistry Iron/chemistry *Microbiota *Ostreidae/metabolism Sulfur Acid volatile sulfide Eutrophication Geochip5.0 Oyster farming gyrB gene; |
| Notes: | "MedlineYan, Qi Song, Junting Zhou, Jin Han, Yilin Cai, Zhonghua eng Netherlands 2022/01/08 Sci Total Environ. 2022 Apr 15; 817:152891. doi: 10.1016/j.scitotenv.2021.152891. Epub 2022 Jan 4" |
