{"id":3773,"date":"2022-12-12T15:36:58","date_gmt":"2022-12-12T14:36:58","guid":{"rendered":"https:\/\/gisposidonie.osupytheas.fr\/?p=3773"},"modified":"2022-12-13T10:15:24","modified_gmt":"2022-12-13T09:15:24","slug":"la-floraison-du-siecles","status":"publish","type":"post","link":"https:\/\/gisposidonie.osupytheas.fr\/?p=3773","title":{"rendered":"La floraison du si\u00e8cle ?"},"content":{"rendered":"\n<p>Apr\u00e8s les \u00e9pisodes de forte chaleur (et en corr\u00e9lation avec les pics d\u2019activit\u00e9 solaire), une floraison exceptionnelle de l\u2019herbier de posidonie est observable depuis la fin de l\u2019\u00e9t\u00e9 2022. Cette floraison, g\u00e9n\u00e9ralis\u00e9e dans tout le Nord-Ouest de la M\u00e9diterran\u00e9e, correspond \u00e0 une floraison dite massive, qui ne s\u2019\u00e9tait pas produite depuis plusieurs ann\u00e9es. Des densit\u00e9s d\u2019inflorescences tr\u00e8s importantes et sup\u00e9rieures aux floraisons massives pr\u00e9c\u00e9dentes ont pu \u00eatre mesur\u00e9es, par exemple \u00e0 Port-Cros (photo). La raret\u00e9 de ce ph\u00e9nom\u00e8ne s\u2019explique par la strat\u00e9gie particuli\u00e8re de reproduction sexu\u00e9e de l\u2019herbier dite de sursaturation du pr\u00e9dateur. De ce fait, la floraison de la posidonie est difficilement pr\u00e9visible avec des cycles allant de 3 \u00e0 11 ans. En g\u00e9n\u00e9ral, l\u2019herbier de posidonie se reproduit par reproduction asexu\u00e9e avec la croissance horizontale et la dispersion des boutures, d\u00e9tach\u00e9es par exemple par les temp\u00eates. Mais cette ann\u00e9e, la reproduction sexu\u00e9e permettra un maintien de la biodiversit\u00e9 g\u00e9n\u00e9tique de l\u2019herbier avec la dispersion des fruits, la germination des graines puis le recrutement des nouvelles plantules. Les fruits, \u00e0 flottabilit\u00e9 positive, seront observables en grand nombre, au printemps prochain en surface ou \u00e9chou\u00e9s sur les plages.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-1024x683.jpg\" alt=\"\" class=\"wp-image-3774\" srcset=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-1024x683.jpg 1024w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-300x200.jpg 300w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-768x512.jpg 768w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-1536x1024.jpg 1536w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-2048x1365.jpg 2048w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC01432-360x240.jpg 360w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Inflorescence de posidonie (c) GIS Posidonie<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-1024x683.jpg\" alt=\"\" class=\"wp-image-3775\" srcset=\"https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-1024x683.jpg 1024w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-300x200.jpg 300w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-768x512.jpg 768w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-1536x1024.jpg 1536w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-2048x1365.jpg 2048w, https:\/\/gisposidonie.osupytheas.fr\/wp-content\/uploads\/2022\/12\/DSC05758-360x240.jpg 360w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Posidonie en fleur (c) GIS Posidonie<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s les \u00e9pisodes de forte chaleur (et en corr\u00e9lation avec les pics d\u2019activit\u00e9 solaire), une floraison exceptionnelle de l\u2019herbier de posidonie est observable depuis la fin de l\u2019\u00e9t\u00e9 2022. Cette floraison, g\u00e9n\u00e9ralis\u00e9e dans tout le Nord-Ouest de la M\u00e9diterran\u00e9e, correspond \u00e0 une floraison dite massive, qui ne s\u2019\u00e9tait pas produite [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":3775,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[64,54],"class_list":["post-3773","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-herbiers-de-posidonie-observation-et-suivis","tag-magnoliophytes","tag-posidonie"],"_links":{"self":[{"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/posts\/3773","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3773"}],"version-history":[{"count":3,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/posts\/3773\/revisions"}],"predecessor-version":[{"id":3779,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/posts\/3773\/revisions\/3779"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=\/wp\/v2\/media\/3775"}],"wp:attachment":[{"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gisposidonie.osupytheas.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}