Diversités et activités microbiennes (bactéries et archées) lors d'événements extrêmes associés aux phénomènes convectifs en milieu marin

Abstract : Open-ocean convection processes are physical phenomena involved in the thermohaline circulation of the global ocean. These processes are frequent in the Mediterranean Sea, and are able to mix all the water column, normally constituted in 3 layers: the surface MAW (Modified Atlantic Water), the intermediate LIW (Levantine Intermediate Water), and the deep WMDW (Western Mediterranean Deep Water). It has been shown that bacterial and archaeal diversity was generally stratified according to these water masses. These organisms are also key players in the organic matter mineralization, and thus of the carbon cycle. Convective mixings are then likely able to disrupt the equilibrium existing between these communities and their environment. For these reasons, I was interesting in the influence of convection processes on heterotrophic prokaryote communities, and their potential impact on biogeochemical cycles. In this study, I observed that convective mixing determined the formation of a new prokaryotic community, composed of typical OTUs (Operational Taxon Unit) from surface and deep layers, and stimulated its production rate despite strong water column mixing. However, this mixed community was rapidly re-stratified in 3 distinct communities with the cessation of the convection process.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2014_BOBAN_SANDRA.pdf
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https://hal.univ-lorraine.fr/hal-01773963
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Submitted on : Monday, April 23, 2018 - 12:21:39 PM
Last modification on : Monday, April 23, 2018 - 12:21:39 PM

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Sandra Boban. Diversités et activités microbiennes (bactéries et archées) lors d'événements extrêmes associés aux phénomènes convectifs en milieu marin. Microbiologie et Parasitologie. 2014. ⟨hal-01773963⟩

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