Three-dimensional structure and cyanobacterial activity within a desert biological soil crust.

Raanan, H., Felde, Vjmnl, Peth, S., Drahorad, S., Ionescu, D., Eshkol, G., Treves, H., Felix-Henningsen, P., Berkowicz, S. M., Keren, N., Horn, Rainer, Hagemann, M. and Kaplan, A. (2016) Three-dimensional structure and cyanobacterial activity within a desert biological soil crust. Environmental Microbiology, 18 (2). pp. 372-383. DOI 10.1111/1462-2920.12859.

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Abstract

Desert biological soil crusts (BSCs) are formed by adhesion of soil particles to polysaccharides excreted by filamentous cyanobacteria, the pioneers and main producers in this habitat. Biological soil crust destruction is a central factor leading to land degradation and desertification. We study the effect of BSC structure on cyanobacterial activity. Micro-scale structural analysis using X-ray microtomography revealed a vesiculated layer 1.5-2.5mm beneath the surface in close proximity to the cyanobacterial location. Light profiles showed attenuation with depth of 1%-5% of surface light within 1mm but also revealed the presence of light pockets', coinciding with the vesiculated layer, where the irradiance was 10-fold higher than adjacent crust parts at the same depth. Maximal photosynthetic activity, examined by O-2 concentration profiles, was observed 1mm beneath the surface and another peak in association with the light pockets'. Thus, photosynthetic activity may not be visible to currently used remote sensing techniques, suggesting that BSCs' contribution to terrestrial productivity is underestimated. Exposure to irradiance higher than 10% full sunlight diminished chlorophyll fluorescence, whereas O-2 evolution and CO2 uptake rose, indicating that fluorescence did not reflect cyanobacterial photosynthetic activity. Our data also indicate that although resistant to high illumination, the BSC-inhabiting cyanobacteria function as low-light adapted' organisms.

Document Type: Article
Additional Information: Times Cited: 1 Raanan, Hagai Felde, Vincent J. M. N. L. Peth, Stephan Drahorad, Sylvie Ionescu, Danny Eshkol, Gil Treves, Haim Felix-Henningsen, Peter Berkowicz, Simon M. Keren, Nir Horn, Rainer Hagemann, Martin Kaplan, Aaron
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/1462-2920.12859
ISSN: 1462-2912
Projects: Future Ocean
Date Deposited: 18 Mar 2017 12:05
Last Modified: 13 Jun 2019 13:59
URI: http://oceanrep.geomar.de/id/eprint/36270

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