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Caractérisation et facteurs structurants des fonctions microbiennes des sédiments de la zone intertidale en Guyane française : des vasières estuariennes aux mangroves matures

Abstract : Under equatorial conditions, coastal sediments of intertidal mudflats form an ecological continuum, from bare mud being stabilized to soil settled by various mangrove facies. Edaphic microbial functions of terrestrial ecosystems are extensively documented; on the contrary, this is not the case with regards to sedimentary environment. This study had the main objective defining the drivers of the spatiotemporal variability of microbial functions (aerobic respiration, metabolic diversity, and enzyme activities) in coastal sediments of French Guiana. These researches were carried out according to biological colonization states (mudflats, pioneer and mature mangroves) and using various spatiotemporal scales considering the fundamental role of the hydro-sedimentary instability and potential variability due to hydro-climatic seasons. Different factors which can influence microbial functions were studied: i) the chemical quality (13C solidstate NMR) of OM with respect to vegetation presence and composition, and its development state; ii) the physicochemical characteristics of sediments and porewaters according to localization and topography of the different mangrove facies. Generally, results showed the importance of hydro-sedimentary instability for the establishment and structuring of microbial functions. Moreover, giving the different models, structuring factors were variables. However, OM, in terms of quantity and quality, was overriding for the expression of these functions and this was true for the evolution states from mudflat to young mangrove. By contrast, it appeared much more difficult discerning generalizable drivers for mature mangroves.
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https://hal-amu.archives-ouvertes.fr/tel-01451685
Contributor : Mathieu Luglia <>
Submitted on : Wednesday, February 1, 2017 - 12:54:02 PM
Last modification on : Tuesday, October 20, 2020 - 3:10:32 AM

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  • HAL Id : tel-01451685, version 1

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Mathieu Luglia. Caractérisation et facteurs structurants des fonctions microbiennes des sédiments de la zone intertidale en Guyane française : des vasières estuariennes aux mangroves matures. Biodiversité et Ecologie. Aix-Marseille Université (AMU), 2014. Français. ⟨tel-01451685⟩

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