5:15 PM - 7:15 PM
[MIS11-P05] Biological Community Changes Before and After the 2011 Tohoku Tsunami using Environmental DNA
It is known that huge tsunamis significantly disturb coastal environment and ecosystem (e.g., Asano et al. 2013). However, it is uncertain how tsunamis influence the coastal environment and ecosystem and whether these changes persist in the medium to long term. Unveiling these changes may contribute to the early reconstruction of coastal environment and ecosystem after such events. Additionally, if these changes remain in deposits, they may be useful for identifying tsunami events and their impacts on the environment. One way to elucidate environment and ecosystem changes before and after a tsunami is through environmental DNA. Environmental DNA is useful because many species can be analyzed simultaneously. For example, Yap et al. (2021) investigated the changes in the ecosystem above and below the 2004 Indian Ocean tsunami deposit. However, it remains unclear whether these changes are universal.
The aim of this study is to reveal the environment and ecosystem changes before and after a large tsunami event. In this study, changes in the microbial community before and after the 2011 Tohoku tsunami on Osuka coast in Hachinohe, Aomori prefecture, were examined using environmental DNA. A 20 cm long sediment core, including the 2011 Tohoku-oki tsunami deposit, was sampled at 1 cm interval and analyzed using environmental DNA. As a result of 16S, we found that microbial communities differ in samples obtained from the tsunami deposit, the soil above and the soil below. In the tsunami deposit, there are relatively more archaea than in other strata. There is less diversity in the soil after the tsunami compared to the soil before the tsunami or the tsunami deposit.
Through this study, it is suggested that the microbial community changed during the event, then the microbial community immediately after the event is different from before. In the presentation, DNA of flora and fauna will be also discussed.
The aim of this study is to reveal the environment and ecosystem changes before and after a large tsunami event. In this study, changes in the microbial community before and after the 2011 Tohoku tsunami on Osuka coast in Hachinohe, Aomori prefecture, were examined using environmental DNA. A 20 cm long sediment core, including the 2011 Tohoku-oki tsunami deposit, was sampled at 1 cm interval and analyzed using environmental DNA. As a result of 16S, we found that microbial communities differ in samples obtained from the tsunami deposit, the soil above and the soil below. In the tsunami deposit, there are relatively more archaea than in other strata. There is less diversity in the soil after the tsunami compared to the soil before the tsunami or the tsunami deposit.
Through this study, it is suggested that the microbial community changed during the event, then the microbial community immediately after the event is different from before. In the presentation, DNA of flora and fauna will be also discussed.