{"id":10178,"date":"2025-04-23T10:53:54","date_gmt":"2025-04-23T20:53:54","guid":{"rendered":"https:\/\/recherche.upf.pf\/?post_type=evenement&p=10178"},"modified":"2025-04-23T10:53:58","modified_gmt":"2025-04-23T20:53:58","slug":"soutenance-de-these-de-klervi-lugue","status":"publish","type":"evenement","link":"https:\/\/recherche.upf.pf\/ty\/evenement\/soutenance-de-these-de-klervi-lugue\/","title":{"rendered":"Soutenance de th\u00e8se de Klervi Lugue"},"content":{"rendered":"

D\u00e9sol\u00e9, ce contenu est uniquement disponible en Fran\u00e7ais<\/a>.<\/p>

“Quantification du r\u00f4le de la plasticit\u00e9 ph\u00e9notypique dans la r\u00e9ponse thermique chez\u00a0Pinctada margaritifera<\/em>”\u00a0–\u00a0<\/strong>\u00a0vendredi 25 avril 2025 \u00e0 9h (heure de France) \u00e0 l’Institut Universitaire Europ\u00e9en de la Mer (IUEM), Plouzan\u00e9<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

D\u00e9partement : <\/strong>Sciences et technologie <\/p>\n\n\n\n

Discipline : <\/strong>Biologie des organismes <\/p>\n\n\n\n

Sp\u00e9cialit\u00e9 : <\/strong>Biologie marine <\/p>\n\n\n\n

R\u00e9sum\u00e9 de la th\u00e8se <\/summary>\n


Chaque ann\u00e9e, les nouveaux records de temp\u00e9ratures oc\u00e9aniques, expliqu\u00e9s par le rythme acc\u00e9l\u00e9r\u00e9 du r\u00e9chauffement climatique et la multiplication des \u00e9v\u00e9nements climatiques extr\u00eames, pr\u00e9cipitent notre plan\u00e8te dans des eaux inexplor\u00e9es. Une question essentielle de la recherche sur le changement climatique est de comprendre comment les populations naturelles et les \u00e9cosyst\u00e8mes r\u00e9pondront aux divers sc\u00e9narios du r\u00e9chauffement climatique.<\/p>\n\n\n\n

Cette probl\u00e9matique rev\u00eat une urgence particuli\u00e8re pour les esp\u00e8ces st\u00e9nothermes, qui sont \u00e0 la fois \u00e9cologiquement et \u00e9conomiquement cruciales, comme l\u2019hu\u00eetre perli\u00e8re \u00e0 l\u00e8vres noires, Pinctada margaritifera. Malgr\u00e9 les efforts scientifiques consid\u00e9rables investis dans l\u2019\u00e9tude de cette esp\u00e8ce au cours des derni\u00e8res d\u00e9cennies, la question de sa sensibilit\u00e9 thermique reste encore largement sous-\u00e9tudi\u00e9e. Afin de contribuer \u00e0 une meilleure prise de d\u00e9cision en mati\u00e8re de conservation et de gestion, cette th\u00e8se a adopt\u00e9 un cadre int\u00e9gratif fond\u00e9 sur le concept de thermal death time (TDT) et de norme de r\u00e9action physiologique, pour d\u00e9terminer les limites thermiques de l\u2019esp\u00e8ce tout au long de son ontogen\u00e8se. Nous formulons l\u2019hypoth\u00e8se que la plasticit\u00e9 ph\u00e9notypique \u2013 capacit\u00e9 d\u2019un g\u00e9notype \u00e0 exprimer une diversit\u00e9 de ph\u00e9notypes en fonction des variations environnementales \u2013 pourrait constituer un m\u00e9canisme adaptatif cl\u00e9 face aux d\u00e9fis du changement climatique. En se fondant sur la caract\u00e9risation du paysage de tol\u00e9rance thermique, des exp\u00e9riences en conditions contr\u00f4l\u00e9es ont \u00e9t\u00e9 men\u00e9es pour quantifier la plasticit\u00e9, tant au stade du naissain (heat-hardening), qu\u2019au stade larvaire (plasticit\u00e9 d\u00e9veloppementale), sous des temp\u00e9ratures variables et \u00e9cologiquement pertinentes.<\/p>\n\n\n\n

Les r\u00e9sultats mettent en lumi\u00e8re, tout d\u2019abord, les diff\u00e9rences marqu\u00e9es de limites thermiques entre les divers stades de vie, les larves p\u00e9lagiques \u00e9tant particuli\u00e8rement sensibles par rapport aux naissains. En outre, ils d\u00e9montrent la capacit\u00e9 de l’esp\u00e8ce \u00e0 moduler sa tol\u00e9rance thermique en fonction de pr\u00e9c\u00e9dents \u00e9v\u00e9nements de stress, tout en soulignant les limites de cette plasticit\u00e9, qui ne saurait \u00eatre consid\u00e9r\u00e9e comme une \u00ab solution miracle \u00bb pour la conservation \u00e9cologique ou l\u2019am\u00e9lioration de l\u2019aquaculture. Ce travail fournit ainsi une base solide, tant sur le plan th\u00e9orique, pour mieux comprendre les m\u00e9canismes sous-jacents aux r\u00e9ponses des esp\u00e8ces face aux changements globaux, que sur le plan pratique, en g\u00e9n\u00e9rant des donn\u00e9es quantitatives sur la sensibilit\u00e9 et la r\u00e9silience de l’esp\u00e8ce.<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n<\/details>\n\n\n\n

Composition du jury <\/summary>\n

– Mme Caroline FABIOUX – Ma\u00eetre de conf\u00e9rences-HDR \u00e0 l’Institut Universitaire Europ\u00e9en de la Mer – UMR 6539-LEMAR –\u00a0Rapporteure<\/strong><\/em><\/p>\n\n\n\n

– M. Herv\u00e9 COLINET – Charg\u00e9 de recherche \u00e0 l’Universit\u00e9 de Rennes – UMR 6553-ECOBIO, CNRS –\u00a0Rapporteur<\/em><\/strong><\/p>\n\n\n\n

– Mme Sabine ROUSSEL – Professeure des universit\u00e9s \u00e0 l’Institut Universitaire Europ\u00e9en de la Mer – UMR 6539 –\u00a0Examinatrice<\/em><\/strong><\/p>\n\n\n\n

– M. Arnaud TANGUY – Ma\u00eetre de conf\u00e9rences-HDR \u00e0 la Sorbonne Universit\u00e9 UPMC – UMR 714-DYDIV –\u00a0Examinateur<\/em><\/strong><\/p>\n\n\n\n

– Mme Nabila GAERTNER-MAZOUNI – Professeure des universit\u00e9s \u00e0 l’Universit\u00e9 de la Polyn\u00e9sie fran\u00e7aise – UMR 241-SECOPOL –\u00a0Examinatrice<\/em><\/strong><\/p>\n\n\n\n

– M. Guillaume MITTA – Professeur des universit\u00e9s \u00e0 l’Universit\u00e9 de la Polyn\u00e9sie fran\u00e7aise – UMR 241-SECOPOL –\u00a0Directeur de th\u00e8se<\/em><\/strong><\/p>\n\n\n\n

– M. Jeremy LE LUYER – Charg\u00e9 de recherche \u00e0 l’Institut Universitaire Europ\u00e9en de la Mer – UMR 6539-LEMAR –\u00a0Co-directeur<\/em><\/strong><\/p>\n<\/details>","protected":false},"author":253,"featured_media":0,"template":"","coauthors":[499],"class_list":["post-10178","evenement","type-evenement","status-publish","hentry","entry"],"acf":[],"yoast_head":"\nSoutenance de th\u00e8se de Klervi Lugue • Recherche UPF<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/recherche.upf.pf\/ty\/evenement\/soutenance-de-these-de-klervi-lugue\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soutenance de th\u00e8se de Klervi Lugue • Recherche UPF\" \/>\n<meta property=\"og:description\" content=\"D\u00e9sol\u00e9, ce contenu est uniquement disponible en Fran\u00e7ais. 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