{"id":3617,"date":"2018-02-25T14:34:25","date_gmt":"2018-02-25T14:34:25","guid":{"rendered":"http:\/\/nantes.apbg.org\/?p=3617"},"modified":"2025-12-07T10:46:20","modified_gmt":"2025-12-07T10:46:20","slug":"visite-et-conference-au-biaf-dangers","status":"publish","type":"post","link":"https:\/\/nantes.apbg.fr\/index.php\/2018\/02\/25\/visite-et-conference-au-biaf-dangers\/","title":{"rendered":"Visite et conf\u00e9rence au BIAF d&rsquo;Angers"},"content":{"rendered":"\n<figure class=\"wp-block-image alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1.jpg\" alt=\"\" class=\"wp-image-7202\" style=\"aspect-ratio:1.7777295537772955;width:492px;height:auto\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le mercredi 4 avril 2018,<\/strong> la r\u00e9gionale de l&rsquo;APBG de Nantes a organis\u00e9 la visite du laboratoire du BIAF (Laboratoire d\u2019\u00e9tude des bio indicateurs actuels et fossiles) \u00e0 Angers suivie d&rsquo;une conf\u00e9rence de <em>Matthieu Durand<\/em> sur l\u2019\u00e9volution environnementale de l\u2019estuaire de la Loire \u00e0 l\u2019Holoc\u00e8ne \u00e0 partir de l\u2019\u00e9tude des foraminif\u00e8res benthiques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les analyses et \u00e9tudes de diff\u00e9rents carottages \u00e0 des endroits pr\u00e9cis : le long de la Loire, dans son estuaire et m\u00eame dans le sud Bretagne permettent de reconstituer l&rsquo;histoire de cette r\u00e9gion \u00e0 l&rsquo;Holoc\u00e8ne et de pr\u00e9voir l\u2019avenir&#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Pourquoi s&rsquo;int\u00e9resser \u00e0 la Loire?<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le bassin de la Loire repr\u00e9sente 1\/5 de la surface de la France. Son \u00e9tude permet de reconstituer l&rsquo;\u00e9volution des apports fluviaux (dynamiques, hydrologie) et de d\u00e9terminer l&rsquo;influence des courants marins de l&rsquo;Atlantique nord sur les apports de la Loire. Ainsi, s&rsquo;int\u00e9resser \u00e0 la Loire permet de reconstituer l&rsquo;histoire pass\u00e9e du climat d&rsquo;une grande partie de la France.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Quels types d&rsquo;analyses?<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les carottes r\u00e9alis\u00e9es ont \u00e9t\u00e9 \u00e9tudi\u00e9es par des techniques d\u2019observations (rayons X), d&rsquo;analyses micropal\u00e9ontologiques sur les foraminif\u00e8res et d&rsquo;analyses g\u00e9ochimiques. Cela a abouti \u00e0 des donn\u00e9es proximales diff\u00e9rentes permettant chacune de d\u00e9crire l&rsquo;\u00e9volution d&rsquo;un param\u00e8tre qui lui n&rsquo;est pas mesurable directement.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le \u03b4 18O pour la temp\u00e9rature,<\/li>\n\n\n\n<li>la diversit\u00e9 des foraminif\u00e8res benthiques pour la salinit\u00e9 et la temp\u00e9rature de l&rsquo;eau,<\/li>\n\n\n\n<li>le fer, titan et l&rsquo;aluminium pour l&rsquo;importance des apports terrig\u00e8nes relatifs \u00e0 la dynamique du fleuve,<\/li>\n\n\n\n<li>le\u00a0\u03b4 13C pour la productivit\u00e9 primaire etc.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Quelles sont les conclusions de cette \u00e9tude?<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Comprendre l&rsquo;\u00e9volution pass\u00e9e du climat permet de faire des prospectives sur le climat futur. Cette \u00e9tude, en corr\u00e9lation avec les sc\u00e9narios du GIEC int\u00e9grants une \u00e9l\u00e9vation de la temp\u00e9rature de 2 \u00e0 3\u00b0C d&rsquo;ici 2050, permet de pr\u00e9voir que la France pourrait avoir deux climats tr\u00e8s diff\u00e9rents. Au nord, beaucoup de pr\u00e9cipitations (pouvant engendrer des inondations plus fr\u00e9quentes) et au sud, une s\u00e9cheresse tr\u00e8s importante. Entre les deux, c&rsquo;est \u00e0 dire dans notre r\u00e9gion, un fort d\u00e9ficit hydrique est \u00e9galement \u00e0 pr\u00e9voir.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"7206\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_171200-1.jpg\" alt=\"\" class=\"wp-image-7206\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_171200-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_171200-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_171200-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"7205\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_165822-1.jpg\" alt=\"\" class=\"wp-image-7205\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_165822-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_165822-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_165822-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"7204\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_161528-1.jpg\" alt=\"\" class=\"wp-image-7204\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_161528-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_161528-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_161528-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"7203\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_154104-1.jpg\" alt=\"\" class=\"wp-image-7203\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_154104-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_154104-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_154104-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"7202\" src=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1.jpg\" alt=\"\" class=\"wp-image-7202\" srcset=\"https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1.jpg 1024w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1-300x169.jpg 300w, https:\/\/nantes.apbg.fr\/wp-content\/uploads\/2018\/02\/20180404_150908-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Le mercredi 4 avril 2018, la r\u00e9gionale de l&rsquo;APBG de Nantes a organis\u00e9 la visite du laboratoire du BIAF (Laboratoire<\/p>\n","protected":false},"author":1,"featured_media":7202,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[5,13],"tags":[],"class_list":["post-3617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conference","category-visite"],"_links":{"self":[{"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/posts\/3617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/comments?post=3617"}],"version-history":[{"count":3,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/posts\/3617\/revisions"}],"predecessor-version":[{"id":7209,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/posts\/3617\/revisions\/7209"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/media\/7202"}],"wp:attachment":[{"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/media?parent=3617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/categories?post=3617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nantes.apbg.fr\/index.php\/wp-json\/wp\/v2\/tags?post=3617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}