Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 760, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.143383
Keywords
Yangze River Estuary; High-throughput sequencing; Community structure; Bacterial diversity
Categories
Funding
- National Natural Science Foundation of China [41771513, 41907110, 51108262, 41001316]
- National Key Research and Development Program of China [2018YFC1901000]
- National Natural Science Foundation of China Open Research Cruise Chuangxin-II [NORC2018-03]
- Shiptime Sharing Project of the National Natural Science Foundation of China [41749903]
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The Yangtze River Estuary and the adjacent East China Sea are affected by both anthropogenic activities and environmental factors, influencing the responses of microbes in surface sediment. Factors such as ocean currents, sediment density, nutrients, sulfate, and salinity play key roles in shaping microbial communities. Different regions have different dominant bacteria, influenced by factors such as sediment density in coastal areas and anthropogenic discharge in the ocean.
Due to the geographical circumstances, the Yangtze River Estuary (YRE) and the adjacent East China Sea are extensively influenced by both anthropogenic activities and environmental factors. To reveal the responses of microbes in surface sediment to environmental factors and their contributions to the biogeochemical cycle in this area, surface sediment and overlying water samples were collected at 21 stations from the estuary to the coastal region. Water and sediment parameters were determined, and 16S rRNA genes of microbes in sediment samples were sequenced using high throughput sequencing technology. The results indicated that ocean currents, sediment density (SD), nutrients, sulfate (SO4-2), and salinity were the key factors shaping the microbial communities. Coastal microbes were affected mainly by SD, whereas anthropogenic discharge might have been responsible for a decrease in indigenous microbial diversity in the ocean. Due to the anthropogenic discharge, the most representative bacteria in the nearshore were aerobic and chemoheterotrophic bacteria, including ammonia-oxidizing bacteria, nitrite-oxidizing bacteria, denitrifying bacteria, and polyphosphate accumulating organisms. In the offshore, anaerobic bacteria, thermophilic bacteria, halophilic bacteria, sulfate-reducing bacteria, and sulfide oxidizing bacteria were the dominant bacteria, and these were characterized by strong solidarity and cooperative properties within the malnourished environment. In summary, these results provide a new perspective for revealing the biogeochemical significance of the bacterial lineages in the YRE, as well as constructive guidance for the management of the marginal sea ecosystems in distinct regions. (C) 2020 Elsevier B.V. All rights reserved.
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