{"id":6466,"date":"2021-04-27T17:31:29","date_gmt":"2021-04-27T15:31:29","guid":{"rendered":"https:\/\/www.pure-ocean.org\/idefix\/"},"modified":"2026-01-15T11:00:47","modified_gmt":"2026-01-15T10:00:47","slug":"idefix","status":"publish","type":"page","link":"https:\/\/www.pure-ocean.org\/en\/idefix\/","title":{"rendered":"IDEFIX"},"content":{"rendered":"<\/div><\/div><\/div><!-- close content main div --><\/div><\/div><div id='av_section_1' class='avia-section main_color avia-section-default avia-no-shadow avia-full-stretch av-parallax-section avia-bg-style-parallax   av-minimum-height av-minimum-height-custom container_wrap sidebar_right'  data-section-bg-repeat='stretch' ><div class='av-parallax' data-avia-parallax-ratio='0.3' ><div class='av-parallax-inner main_color  avia-full-stretch' style = 'background-repeat: no-repeat; background-image: url(https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/capricorn_oli_2019244_lrg-scaled.jpg); background-attachment: scroll; background-position: center center; ' ><\/div><\/div><div class='container' style='height:400px'><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-6466'><div class='entry-content-wrapper clearfix'><\/div><\/div><\/div><!-- close content main div --><\/div><\/div><div id='after_section_1' class='main_color av_default_container_wrap container_wrap sidebar_right'   ><div class='container' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-6466'><div class='entry-content-wrapper clearfix'>\n<div class=\"flex_column av_three_fifth  flex_column_div av-zero-column-padding first  \" style='border-radius:0px; '><p><div class='avia-button-wrap avia-button-left '><a href='' class='avia-button av-icon-on-hover  avia-icon_select-yes-left-icon avia-color-custom avia-size-medium avia-position-left '  style='background-color:#071562; border-color:#071562; color:#ffffff; ' ><span class='avia_button_icon avia_button_icon_left ' aria-hidden='true' data-av_icon='\ue8b1' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >AM\u00c9LIORER NOTRE CONNAISSANCE DU SYST\u00c8ME-OC\u00c9AN<\/span><\/a><\/div><br \/>\n<div style='height:25px' class='hr hr-invisible  '><span class='hr-inner ' ><span class='hr-inner-style'><\/span><\/span><\/div><br \/>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  av_inherit_color '  style='color:#071562; '  itemprop=\"text\" ><h1 style=\"text-align: left;\">IDEFIX<\/h1>\n<h3 style=\"text-align: left;\">Des petits organismes aux grands pouvoirs<\/h3>\n<\/div><\/section><\/p><\/div>\n<div class=\"flex_column av_one_fifth  flex_column_div av-zero-column-padding   \" style='border-radius:0px; '><div class='avia-image-container  av-styling-    avia-align-center '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><img class='avia_image ' src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2017\/09\/pictoDEF-01.png' alt='' title='Mission 1'   itemprop=\"thumbnailUrl\"  \/><\/div><\/div><\/div>\n<div class=\"flex_column av_one_fifth  flex_column_div   \" style='padding:20px; border-radius:0px; '><p><div style='padding-bottom:10px;' class='av-special-heading av-special-heading-h3    '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >LOCALISATION<\/h3><div class='special-heading-border'><div class='special-heading-inner-border' ><\/div><\/div><\/div><br \/>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><p>Oc\u00e9an Indien<\/p>\n<\/div><\/section><\/p><\/div>\n<div  class='hr hr-default  '><span class='hr-inner ' ><span class='hr-inner-style'><\/span><\/span><\/div>\n<div class=\"flex_column av_two_third  flex_column_div av-zero-column-padding first  \" style='margin-top:0px; margin-bottom:0px; border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><h3 style=\"text-align: justify;\"><strong>L\u2019azote est un \u00e9l\u00e9ment indispensable \u00e0 tous les \u00eatres vivants. Dans l\u2019oc\u00e9an, les micro-organismes appel\u00e9s diazotrophes transforment l\u2019azote atmosph\u00e9rique dissous dans l\u2019eau (diazote, N2) en une forme utilisable par les plantes et animaux marins : on parle alors de \u201cfixation\u201d de l\u2019azote, un processus cl\u00e9 qui alimente toutes les cha\u00eenes alimentaires marines et permet la captation de CO2 \u00a0par l\u2019oc\u00e9an. Ce projet vise \u00e0 \u00e9tudier ce ph\u00e9nom\u00e8ne naturel en fonction des saisons de mousson dans l\u2019Oc\u00e9an Indien, le bassin oc\u00e9anique se r\u00e9chauffant le plus vite au monde. Les chercheurs esp\u00e8rent \u00e9galement d\u00e9couvrir de nouvelles esp\u00e8ces de diazotrophes propres \u00e0 cette r\u00e9gion.<\/strong><\/h3>\n<\/div><\/section><br \/>\n<div  class='hr hr-default  '><span class='hr-inner ' ><span class='hr-inner-style'><\/span><\/span><\/div><br \/>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Gr\u00e2ce au phytoplancton r\u00e9alisant la photosynth\u00e8se, l\u2019oc\u00e9an capte pr\u00e8s de 25% de nos \u00e9missions de CO<\/span><span style=\"font-weight: 400;\">2 <\/span><span style=\"font-weight: 400;\">chaque ann\u00e9e, et contribue donc \u00e0 limiter le r\u00e9chauffement climatique. Mais cette r\u00e9action n\u2019est possible que si le phytoplancton dispose d\u2019azote, un \u00e9l\u00e9ment essentiel \u00e0 tous les \u00eatres vivants. Les micro-organismes qui le leur fournissent sont appel\u00e9s diazotrophes : ils transforment le diazote (N<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">) dissous dans l\u2019eau en une forme assimilable par les autres organismes marins, un processus que l\u2019on appelle \u201cfixation de l\u2019azote\u201d et dont les m\u00e9canismes exacts sont encore peu connus selon les r\u00e9gions du monde.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Le projet IDEFIX \u00e9tudie la fixation d\u2019azote dans l\u2019Oc\u00e9an Indien en fonction des saisons de mousson. C\u2019est le bassin oc\u00e9anique se r\u00e9chauffant le plus vite au monde, et d\u00e9crypter le r\u00f4le de l\u2019azote et des diazotrophes pourrait permettre d\u2019expliquer pourquoi. De nouvelles esp\u00e8ces de diazotrophes propres \u00e0 cette r\u00e9gion seront \u00e9galement \u00e0 d\u00e9couvrir lors de la Seconde Exp\u00e9dition Internationale dans l\u2019Oc\u00e9an Indien (2022).<\/span><\/p>\n<\/div><\/section><\/p><\/div>\n<div class=\"flex_column av_one_third  flex_column_div av-zero-column-padding   \" style='margin-top:0px; margin-bottom:0px; border-radius:0px; '><p><div style='padding-bottom:0px;' class='av-special-heading av-special-heading-h3    '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >OBJECTIF DU PROJET<\/h3><div class='special-heading-border'><div class='special-heading-inner-border' ><\/div><\/div><\/div><br \/>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><p><span style=\"font-weight: 400;\">D\u00e9crypter le r\u00f4le de la fixation du diazote (N<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">) en fonction des saisons de mousson et d\u00e9couvrir de nouvelles esp\u00e8ces de diazotrophes propres \u00e0 l\u2019Oc\u00e9an Indien.<\/span><\/p>\n<\/div><\/section><br \/>\n<div  data-size='portfolio'  data-lightbox_size='large'  data-animation='slide'  data-ids='16615,16611,16157,16161,16613'  data-video_counter='0'  data-autoplay='true'  data-bg_slider='false'  data-slide_height=''  data-handle='av_slideshow'  data-interval='6'  data-class='  avia-small-width-slider'  data-css_id=''  data-scroll_down=''  data-control_layout='av-control-default'  data-custom_markup=''  data-perma_caption=''  data-autoplay_stopper=''  data-image_attachment=''  data-min_height='0px'  data-default-height='80.808080808081'  class='avia-slideshow avia-slideshow-1  av-control-default av-default-height-applied avia-slideshow-portfolio av_slideshow   avia-small-width-slider avia-slide-slider '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><ul class='avia-slideshow-inner' style='padding-bottom: 80.808080808081%;'><li  class=' slide-1 ' ><div data-rel='slideshow-1' class='avia-slide-wrap'  ><img src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Photo-2-495x400.jpg' width='495' height='400' title='Photo 2' alt=''  itemprop=\"thumbnailUrl\"   \/><\/div><\/li><li  class=' slide-2 ' ><div data-rel='slideshow-1' class='avia-slide-wrap'  ><img src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Lab-IDEFIX-2-495x400.png' width='495' height='400' title='Lab IDEFIX 2' alt=''  itemprop=\"thumbnailUrl\"   \/><\/div><\/li><li  class=' slide-3 ' ><div data-rel='slideshow-1' class='avia-slide-wrap'  ><img src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/04\/Climate-Change-Simulation-Mar-Benavides-495x400.jpg' width='495' height='400' title='Climate Change Simulation Mar Benavides' alt=''  itemprop=\"thumbnailUrl\"   \/><\/div><\/li><li  class=' slide-4 ' ><div data-rel='slideshow-1' class='avia-slide-wrap'  ><img src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/04\/Trichodesmium-495x400.jpg' width='495' height='400' title='Trichodesmium' alt=''  itemprop=\"thumbnailUrl\"   \/><\/div><\/li><li  class=' slide-5 ' ><div data-rel='slideshow-1' class='avia-slide-wrap'  ><img src='https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Subhadeep-lab-495x400.png' width='495' height='400' title='Subhadeep lab' alt=''  itemprop=\"thumbnailUrl\"   \/><\/div><\/li><\/ul><div class='avia-slideshow-arrows avia-slideshow-controls'><a href='#prev' class='prev-slide' aria-hidden='true' data-av_icon='\ue87c' data-av_iconfont='entypo-fontello'>Previous<\/a><a href='#next' class='next-slide' aria-hidden='true' data-av_icon='\ue87d' data-av_iconfont='entypo-fontello'>Next<\/a><\/div><div class='avia-slideshow-dots avia-slideshow-controls'><a href='#1' class='goto-slide active' >1<\/a><a href='#2' class='goto-slide ' >2<\/a><a href='#3' class='goto-slide ' >3<\/a><a href='#4' class='goto-slide ' >4<\/a><a href='#5' class='goto-slide ' >5<\/a><\/div><\/div><\/p><\/div>\n<div  class='hr hr-default  '><span class='hr-inner ' ><span class='hr-inner-style'><\/span><\/span><\/div>\n<div class=\"flex_column av_one_fifth  flex_column_div av-zero-column-padding first  \" style='border-radius:0px; '><\/div>\n<div class=\"flex_column av_three_fifth  flex_column_div av-zero-column-padding   \" style='border-radius:0px; '><div  class='avia-video avia-video-16-9   '  itemprop=\"video\" itemtype=\"https:\/\/schema.org\/VideoObject\" ><div class='avia-iframe-wrap'><iframe title=\"IDEFIX: Diazotrophs and their roles in the Indian Ocean (M. Benavides, MIO, Marseille)\" width=\"1333\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/_EPdu7LmTZk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div><\/div><\/div>\n<div class=\"flex_column av_one_fifth  flex_column_div av-zero-column-padding   \" style='border-radius:0px; '><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding first  \" style='border-radius:0px; '><div style='padding-bottom:0px;' class='av-special-heading av-special-heading-h3    '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >PORTEURS DU PROJET<\/h3><div class='special-heading-border'><div class='special-heading-inner-border' ><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding   \" style='border-radius:0px; '><div style='padding-bottom:10px;' class='av-special-heading av-special-heading-h3    '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >PARTENAIRES SCIENTIFIQUES<\/h3><div class='special-heading-border'><div class='special-heading-inner-border' ><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_fourth  flex_column_div av-zero-column-padding first  \" style='margin-top:0px; margin-bottom:0px; border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  av_inherit_color '  style='color:#000000; '  itemprop=\"text\" ><p><img decoding=\"async\" class=\"aligncenter wp-image-7533\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo.jpg\" alt=\"\" width=\"182\" height=\"182\" srcset=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo.jpg 512w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-300x300.jpg 300w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-80x80.jpg 80w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-36x36.jpg 36w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-180x180.jpg 180w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-120x120.jpg 120w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Mar-photo-450x450.jpg 450w\" sizes=\"(max-width: 182px) 100vw, 182px\" \/>Mar Benavides, charg\u00e9e de recherche IRD \u00e0 l\u2019Institut M\u00e9diterran\u00e9en d\u2019Oc\u00e9anologie (MIO), Marseille, France.<\/p>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_fourth  flex_column_div av-zero-column-padding   \" style='margin-top:0px; margin-bottom:0px; border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  av_inherit_color '  style='color:#000000; '  itemprop=\"text\" ><p><img decoding=\"async\" class=\"aligncenter wp-image-7535 size-square\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-180x180.jpeg\" alt=\"\" width=\"180\" height=\"180\" srcset=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-180x180.jpeg 180w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-300x300.jpeg 300w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-80x80.jpeg 80w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-36x36.jpeg 36w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1-120x120.jpeg 120w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/WhatsApp-Image-2021-09-08-at-21.40.43-2-1.jpeg 306w\" sizes=\"(max-width: 180px) 100vw, 180px\" \/>Subhadeep Chowdhury, doctorant \u00e0 l\u2019Universit\u00e9 d\u2019Aix-Marseille, France.<\/p>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_fourth  flex_column_div av-zero-column-padding   \" style='margin-top:0px; margin-bottom:0px; border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><p><span style=\"font-weight: 400;\"><img decoding=\"async\" class=\"aligncenter wp-image-7536 size-square\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-180x180.jpg\" alt=\"\" width=\"180\" height=\"180\" srcset=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-180x180.jpg 180w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-80x80.jpg 80w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-36x36.jpg 36w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-431x430.jpg 431w, https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Arvind-photo-120x120.jpg 120w\" sizes=\"(max-width: 180px) 100vw, 180px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dr. Arvind Singh, ma\u00eetre de conf\u00e9rences au Physical Research Laboratory (PRL) \u00e0 Ahmedabad, Inde.<\/span><\/p>\n<\/div><\/section><\/div>\n<div  class='hr hr-default  '><span class='hr-inner ' ><span class='hr-inner-style'><\/span><\/span><\/div>\n<div  data-autoplay='false'  data-interval='5'  data-animation='slide'  class='avia-logo-element-container av-border-deactivate avia-logo-grid avia-content-slider avia-smallarrow-slider avia-content-grid-active noHover avia-content-slider1 avia-content-slider-even  ' ><div class='avia-smallarrow-slider-heading  no-logo-slider-heading '><div class='new-special-heading'>&nbsp;<\/div><\/div><div class='avia-content-slider-inner'><div class='slide-entry-wrap'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div  class='slide-entry flex_column no_margin post-entry slide-entry-overview slide-loop-1 slide-parity-odd  av_one_fourth first real-thumbnail'><img loading=\"lazy\" decoding=\"async\"  itemprop=\"thumbnailUrl\"  width=\"130\" height=\"107\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/IRD-final.png\" class=\"attachment-no scaling size-no scaling\" alt=\"\" \/><\/div><div  class='slide-entry flex_column no_margin post-entry slide-entry-overview slide-loop-2 slide-parity-even  av_one_fourth  real-thumbnail'><img loading=\"lazy\" decoding=\"async\"  itemprop=\"thumbnailUrl\"  width=\"150\" height=\"100\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/MIO-final-2.png\" class=\"attachment-no scaling size-no scaling\" alt=\"\" \/><\/div><div  class='slide-entry flex_column no_margin post-entry slide-entry-overview slide-loop-3 slide-parity-odd  av_one_fourth  real-thumbnail'><img loading=\"lazy\" decoding=\"async\"  itemprop=\"thumbnailUrl\"  width=\"152\" height=\"159\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/cefipra.png\" class=\"attachment-no scaling size-no scaling\" alt=\"\" \/><\/div><div  class='slide-entry flex_column no_margin post-entry slide-entry-overview slide-loop-4 slide-parity-even  post-entry-last  av_one_fourth  real-thumbnail'><img loading=\"lazy\" decoding=\"async\"  itemprop=\"thumbnailUrl\"  width=\"140\" height=\"85\" src=\"https:\/\/www.pure-ocean.org\/wp-content\/uploads\/2021\/12\/Bridges-final.png\" class=\"attachment-no scaling size-no scaling\" alt=\"\" \/><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"class_list":["post-6466","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>IDEFIX - Pure Ocean<\/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:\/\/www.pure-ocean.org\/?page_id=6103\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IDEFIX - Pure Ocean\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pure-ocean.org\/?page_id=6103\" \/>\n<meta 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