File:Biomass distribution in a bacteria mat under different conditions.jpg
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DescriptionBiomass distribution in a bacteria mat under different conditions.jpg |
English: Biomass distribution in a bacteria mat under different light conditions Conceptual drawing of the biomass distribution during different light acclimation scenarios and the corresponding radiative energy budgets of the entire photic zone measured under an incident photon irradiance of 1000 μmol photons m–2 s–1. The surface layers of the microbial mat were dominated by dense populations of motile cyanobacteria (Microcoleus sp. and other filamentous species) and filamentous sulfide oxidizing bacteria (Beggiatoa spp.). Beneath the narrow photic zone, a dark FeS-containing sediment layer was present. In low light, the upper layers became oxidized driving the O2-HS interface and thus Beggiatoa deeper into the mat, while the motile cyanobacteria moved toward the mat surface under non-inhibitory light levels. In high light, a larger part of the biofilm is oxidized, Beggiatoa moved further down, while motile cyanobacteria in the top layers started to move downwards to avoid high photoinhibitory light levels at the microbial mat surface. In darkness, the entire mat became anoxic and the Beggiatoa moved to the mat surface forming a white layer on top of the cyanobacteria, to avoid the high levels of H2S and remain at the O2-H2S interface (Preisler et al., 2007), whereas the cyanobacteria remained in a dense layer underneath.
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Date | |
Source | [1] doi:10.3389/fmars.2020.00359 |
Author | Mads Lichtenberg, Paulo Cartaxana and Michael Kühl |
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current | 01:50, 12 August 2021 | 3,881 × 2,427 (351 KB) | Epipelagic (talk | contribs) | Uploaded a work by Mads Lichtenberg, Paulo Cartaxana and Michael Kühl from [https://www.frontiersin.org/articles/10.3389/fmars.2020.00359/full] {{doi|10.3389/fmars.2020.00359}} with UploadWizard |
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Date and time of digitizing | 03:21, 14 May 2020 |
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Date metadata was last modified | 18:12, 15 May 2020 |
Unique ID of original document | xmp.did:789eae15-071b-1e4a-a0d9-f17e17781388 |