Increase in sedimentary organic carbon with a change from hypoxic to oxic conditions
| Autor: | Shunsuke Taki, Wataru Nishijima, Takehiko Gotoh, Réka Hajdu-Rahkama, Mukseet Mahmood, Satoshi Nakai, Tomo Aoyagi, Yoko Katayama, Tomoyuki Hori, Yuya Sato, Akira Umehara, Jaakko A. Puhakka |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Total organic carbon Geologic Sediments Chemistry Helicobacteraceae 010604 marine biology & hydrobiology Chemical oxygen demand Sediment 010501 environmental sciences Aquatic Science Biodegradation Oceanography 01 natural sciences Pollution Carbon Sedimentary depositional environment Bottom water Japan Environmental chemistry Dissolved organic carbon Autotroph 0105 earth and related environmental sciences |
| Zdroj: | Marine pollution bulletin. 168 |
| ISSN: | 1879-3363 |
| Popis: | In the Seto Inland Sea, Japan, chemical oxygen demand has increased over recent decades, while average dissolved oxygen concentrations in the bottom water have increased. In this study, we investigated responses of organic carbon (OC) in hypoxic sediment to changes of redox conditions using experimental columns containing sediment and overlying water. Surface sediment showed an increase in OC along with the change to an aerobic condition. Microbial community analysis showed a predominance of sulfur-oxidizing bacteria (SOB) such as Sulfurovum sp. in the sediment. This dominance could account for the increased OC. Additionally, the dissolved organic carbon (DOC) concentration in the overlying water increased. Further experiments using sandy sediment showed that biodegradation of Sulfurimonas denitrificans was associated with DOC release. These results show that a change in the sedimentary environment (increase in dissolved oxygen) increased the sedimentary OC and DOC of overlying water by stimulating certain autotrophic bacteria, especially the SOB. |
| Databáze: | OpenAIRE |
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