Institut Méditerranéen d’Océanologie
Accueil du site > Agenda > Nos séminaires > Conférence « Microbiologie en milieux polaires » #extrêmophiles (...)

Conférence « Microbiologie en milieux polaires » #extrêmophiles #astrobiologie

Version imprimable de cet article

Dans le cadre du 3ème workshop du projet européen ERANET-LAC METHANOBASE (METHANOgenic Biodiversity and activity in Arctic and Subantartic Ecosystems affected by climate change), co-piloté par Drs Maialen BARRET (ECOLAB Toulouse) et Léa CABROL (M.I.O Marseille), nous aurons le plaisir d’accueillir au M.I.O Dr Alison MURRAY, chercheur au Desert Research Institute, Reno, USA.

Alison Murray est une experte reconnue en écologie microbienne marine et plus particulièrement en milieux extrêmes, notamment Antarctique. Ses recherches de traces de vie microbienne dans le lac gelé hypersalé Vida ont été particulièrement remarqués. Ses travaux se tournent maintenant vers l’exobiologie.
Invitée par Léa Cabrol, Alison Murray nous donnera une conférence Jeudi 25 octobre, à 13h30, dans l’amphithéâtre Oceanomed, intitulée :

Life in Antarctica’s Icy and Ocean Ecosystems :
Windows to Ocean Worlds of the Outer Solar System

La conférence portera sur le sujet suivant :
Recent studies in previously unexplored Antarctic ecosystems have modified our understanding of the cryosphere and polar oceans by providing new revelations regarding habitability and life’s ability to adapt to harsh conditions. Such explorations into frozen hypersaline lakes, subglacial hydrologic systems, and underneath ice shelves have expanded our understanding of the diverse life forms that call this seemingly inhospitable environment home. These habitats have revealed new ecological communities adapted to various extreme conditions – including dark, isolated, resource-poor chemoautotrophic ecosystems ; ice-sealed -13C anoxic hypersaline brines dominated by ultramicrobacteria and microbial taxa (e.g. Marinobacter, Psychrobacter, Epsilonproteobacteria) that are transcriptionally active at -13C ; and an ice-associated marine invertebrate assemblage that occupies the dark, ice shelf-ocean interface zone that is new to science. As NASA turns to the ocean worlds of the outer solar system as a new direction in planetary exploration, new perspectives in viewing the structure and function of life in Earth’s cryosphere can provide valuable insight both in terms of understanding life on Earth and in terms of grounding the search for life in ocean-bearing moons, such as Europa and Enceladus. Polar habitats on Earth are being used to identify benchmarks for detecting signs of life on future NASA missions to the ocean worlds. This provides the opportunity to view Earth’s ocean and icy ecosystems with a new perspective that requires unbiased investigation of the impacts that life and life-associated processes have in the cryosphere and polar ocean.