Environmental DNA signatures distinguish between tsunami and storm deposition in overwash sand

Yap, Wenshu; Switzer, Adam D.; Gouramanis, Chris; Marzinelli, Ezequiel M.; Wijaya, Winona; Yan, Yu; Dominey‐Howes, Dale; Labbate, Maurizio; Srinivasalu, S.; Jankaew, Kruawun; Lauro, Federico M.

doi:10.1038/s43247-021-00199-3

Cited by 13 publications

(5 citation statements)

References 71 publications

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“…While all the seawater samples we collected using Lander (Methods), those from the trench bottom still show significant differences from the sediment, further confirming the stability of our conclusions. All these results, from different aspects, indicated that the ecological niche differentiation of microbial community composition might be influenced by marine geological conditions and hydrological factors, which is related to the availability of organic matter and redox pairs, and/or stochastic processes such as currents (Chen et al, 2023 ; Jing et al, 2022 ; Yap et al, 2021 ; Zhou et al, 2022 ). The trench sediment ecosystems were reported to be dominated by stochasticity in previous study (Sun et al, 2024 ), indicating that factors such as drift and dispersal are more likely to form and exist in trenches.…”

Section: Discussionmentioning

confidence: 99%

Microbial communities reveal niche partitioning across the slope and bottom zones of the challenger deep

Hu,

Zhao,

Wang

et al. 2024

Environ Microbiol Rep

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Widespread marine microbiomes exhibit compositional and functional differentiation as a result of adaptation driven by environmental characteristics. We investigated the microbial communities in both seawater and sediments on the slope (7–9 km) and the bottom (9–11 km) of the Challenger Deep of the Mariana Trench to explore community differentiation. Both metagenome‐assembled genomes (MAGs) and 16S rRNA amplicon sequence variants (ASVs) showed that the microbial composition in the seawater was similar to that of sediment on the slope, while distinct from that of sediment in the bottom. This scenario suggested a potentially stronger community interaction between seawater and sediment on the slope, which was further confirmed by community assembly and population movement analyses. The metagenomic analysis also indicates a specific stronger potential of nitrate reduction and sulphate assimilation in the bottom seawater, while more versatile nitrogen and sulphur cycling pathways occur on the slope, reflecting functional differentiations among communities in conjunction with environmental features. This work implies that microbial community differentiation occurred in the different hadal niches, and was likely an outcome of microbial adaptation to the extreme hadal trench environment, especially the associated hydrological and geological conditions, which should be considered and measured in situ in future studies.

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Section: Discussionmentioning

confidence: 99%

Microbial communities reveal niche partitioning across the slope and bottom zones of the challenger deep

Hu,

Zhao,

Wang

et al. 2024

Environ Microbiol Rep

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“…Such foliation of the fine fraction is then related to specific flow conditions that have been linked to a seiche effect and thus probably an earthquake event [30,219]. Molecular techniques such as sedimentary DNA are also promising to accurately discriminate between modern tsunami and storm deposits in coastal systems [268,269].…”

Section: Other Approachesmentioning

confidence: 99%

A Review of Event Deposits in Lake Sediments

et al. 2022

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Event deposits in lake sediments provide invaluable chronicles of geodynamic and climatic natural hazards on multi-millennial timescales. Sediment archives are particularly useful for reconstructing high-impact, low-frequency events, which are rarely observed in instrumental or historical data. However, attributing a trigger mechanism to event deposits observed in lake sediments can be particularly challenging as different types of events can produce deposits with very similar lithological characteristics, such as turbidites. In this review paper, we summarize the state of the art on event deposits in paleolimnology. We start by describing the sedimentary facies typical of floods, glacial lake outburst floods, avalanches, hurricanes, earthquakes, tsunamis, volcanic eruptions, and spontaneous delta collapses. We then describe the most indicative methods that can be applied at the scale of lake basins (geophysical survey, multiple coring) and on sediment cores (sedimentology, inorganic and organic geochemistry, biotic approach). Finally, we provide recommendations on how to obtain accurate chronologies on sediment cores containing event deposits, and ultimately date the events. Accurately identifying and dating event deposits has the potential to improve hazard assessments, particularly in terms of the return periods, recurrence patterns, and maximum magnitudes, which is one of the main geological challenges for sustainable worldwide development.

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“…A recent review by Chagué-Goff et al [78] has demonstrated that geochemical proxies when combined with a good knowledge of the geological context of the studied site and of depositional and chemical processes, can be a powerful tool to differentiate tsunami deposits. New proxies also include ancient DNA for the characterization of microbial communities or microfossil assemblages in sediments [79,80].…”

Section: Holocene Record Of Tsunamis In Greece 41 Main Geological and Geomorphological Evidencementioning

confidence: 99%

Tsunamis in the Greek Region: An Overview of Geological and Geomorphological Evidence

et al. 2021

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The Greek region is known as one of the most seismically and tectonically active areas and it has been struck by some devastating tsunamis, with the most prominent one being the 365 AD event. During the past decade significant research efforts have been made in search of geological and geomorphological evidence of palaeotsunamis along the Greek coasts, primarily through the examination of sediment corings (72% of studies) and secondarily through boulders (i.e., 18%). The published data show that some deposits have been correlated with well-known events such as 365 AD, 1303 AD, the Minoan Santorini Eruption and the 1956 Amorgos earthquake and tsunami, while coastal studies from western Greece have also reported up to five tsunami events, dating as far back as the 6th millennium BC. Although the Ionian Islands, Peloponnese and Crete has been significantly studied, in the Aegean region research efforts are still scarce. Recent events such as the 1956 earthquake and tsunami and the 2020 Samos earthquake and tsunami highlight the need for further studies in this region, to better assess the impact of past events and for improving our knowledge of tsunami history. As Greece is amongst the most seismically active regions globally and has suffered from devastating tsunamis in the past, the identification of tsunami prone areas is essential not only for the scientific community but also for public authorities to design appropriate mitigation measures and prevent tsunami losses in the future.

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Environmental DNA signatures distinguish between tsunami and storm deposition in overwash sand

Cited by 13 publications

References 71 publications

Microbial communities reveal niche partitioning across the slope and bottom zones of the challenger deep

Microbial communities reveal niche partitioning across the slope and bottom zones of the challenger deep

A Review of Event Deposits in Lake Sediments

Tsunamis in the Greek Region: An Overview of Geological and Geomorphological Evidence

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