{"id":243872,"date":"2023-03-06T23:04:25","date_gmt":"2023-03-06T22:04:25","guid":{"rendered":"https:\/\/subamacon.com\/?p=243872"},"modified":"2023-10-21T13:36:13","modified_gmt":"2023-10-21T11:36:13","slug":"les-gorgones","status":"publish","type":"post","link":"https:\/\/subamacon.com\/index.php\/2023\/03\/06\/les-gorgones\/","title":{"rendered":"Les Gorgones"},"content":{"rendered":"\n\n[et_pb_section fb_built=\u00a0\u00bb1″ _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb min_height=\u00a0\u00bb150.8px\u00a0\u00bb height=\u00a0\u00bb1000px\u00a0\u00bb max_height=\u00a0\u00bb1000px\u00a0\u00bb custom_margin=\u00a0\u00bb-3px||||false|false\u00a0\u00bb custom_padding=\u00a0\u00bb1px||||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb column_structure=\u00a0\u00bb2_5,3_5″][et_pb_column type=\u00a0\u00bb2_5″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/subamacon.com\/wp-content\/uploads\/2023\/03\/IMG-20230305-WA0019-e1678645806461.jpg\u00a0\u00bb _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb title_text=\u00a0\u00bbIMG-20230305-WA0019″ hover_enabled=\u00a0\u00bb0″ sticky_enabled=\u00a0\u00bb0″][\/et_pb_image][\/et_pb_column][et_pb_column type=\u00a0\u00bb3_5″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ sticky_enabled=\u00a0\u00bb0″]
On ne peut pas les rater tellement elles sont spectaculaires: rouges, bleues, mauves, oranges, jaunes ou encore blanches, les gorgones sont \u00e0 la fois magnifiques et fragiles tel un \u00e9ventail de dentelle accroch\u00e9 au tombant.<\/strong><\/h5>\n
Mais \u00e0 part \u00e7a, c\u2019est quoi une gorgone\u00a0?<\/strong><\/h5>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb||0px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb custom_margin=\u00a0\u00bb-18px|auto||auto||\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]
Les Gorgones, c’est quoi ?<\/b><\/u><\/h5>\n
C<\/span><\/span>ontrairement \u00e0 ce que certains auraient pu penser, les gorgones ne sont pas des v\u00e9g\u00e9taux mais des animaux. <\/span><\/span><\/h5>\n
Elles<\/span><\/span> appartiennent au <\/span><\/span>m\u00eame <\/span><\/span>groupe <\/span><\/span>d\u2019<\/span><\/span>esp\u00e8ces <\/span><\/span>que<\/span><\/span> les <\/span><\/span>coraux, <\/span><\/span>les an\u00e9mones de mer ou les m\u00e9duses. <\/span><\/span><\/h5>\n
Ce sont <\/span><\/span>des animaux invert\u00e9br\u00e9s.<\/h5>\n
Des milliers de minuscules polypes vivent ensemble pour former ce que l’on appelle une colonie. <\/span>Leurs squelettes en calcaire sont coll\u00e9s et forment des ramifications, un peu comme des branches ou un \u00e9ventail.<\/h5>\n
Chacun des milliers de polypes composant les colonies dispose de 8 tentacules.<\/h5>\n
Les colonies de gorgones peuvent vivre et cro\u00eetre pendant des centaines, voire des milliers d\u2019ann\u00e9es.<\/h5>\n
<\/h5>\n

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Quelle<\/b><\/u> taille\u00a0?<\/b><\/u><\/h5>\n
Les gorgones grandissent tr\u00e8s lentement, de quelques millim\u00e8tres \u00e0 quelques centim\u00e8tres par an selon les esp\u00e8ces.<\/h5>\n
M\u00eame si elles ne sont \u00e9paisses que de quelques centim\u00e8tres, <\/span><\/span>e<\/span><\/span>lles peuvent atteindre des tailles remarquables d\u00e9passant parfois les deux m\u00e8tres d\u2019envergure.<\/h5>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]
Elles<\/b><\/u> mange<\/b><\/u>nt<\/b><\/u> quoi\u00a0?<\/b><\/u><\/h5>\n
Les gorgones filtrent l\u2019eau qui passe \u00e0 travers les mailles de la colonie pour attraper le plancton et les microparticules pr\u00e9sentes dans l\u2019eau. C\u2019est pour cette raison qu\u2019elles poussent perpendiculairement au courant, de mani\u00e8re \u00e0 filtrer un maximum d’eau pour augmenter les chances d’attraper le plancton.<\/h5>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]
Comment se reproduis<\/b><\/u>ent-elles<\/b><\/u>\u00a0?<\/b><\/u><\/h5>\n
Les gorgones sont hermaphrodites (m\u00e2les et femelles dans la colonie).<\/h5>\n
Elle se reproduisent de mani\u00e8re sexu\u00e9e par f\u00e9condation externe<\/span><\/strong>.<\/span> Les \u0153ufs donnent naissance \u00e0 de petites larves qui vont aller s\u2019installer sur une surface dure (rocher). Elles se transforment ensuite en petits polypes qui, en bourgeonnant donnent de nouvelles colonies.<\/h5>\n

<\/span><\/p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]

Une esp\u00e8ce prot\u00e9g\u00e9e\u00a0?<\/b><\/u><\/h5>\n
<\/h5>\n
Les gorgones ne font pas partie des esp\u00e8ces prot\u00e9g\u00e9es.<\/h5>\n
N\u00e9anmoins, elles sont fragilis\u00e9es par :<\/h5>\n
– des pr\u00e9dateurs\u00a0: des mollusques tels les nudibranches et escargots de mer.<\/h5>\n
– l\u2019activit\u00e9 humaine\u00a0: ancrages des bateaux, pose des filets de p\u00eache, hypers\u00e9dimentation (d\u00fb aux am\u00e9nagements c\u00f4tiers, aux modifications des cours d\u2019eau et aux autres rejets de s\u00e9diments dans le milieu marin)<\/h5>\n
– le changement climatique\u00a0: l\u2019augmentation de la temp\u00e9rature de l\u2019eau (temp\u00e9rature > 22\u00a0\u00b0C) sur de longues p\u00e9riodes est \u00e0 l\u2019origine d\u2019\u00e9pisodes de mortalit\u00e9.<\/h5>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_margin=\u00a0\u00bb|auto|-51px|auto||\u00a0\u00bb custom_padding=\u00a0\u00bb0px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.20.2″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_margin=\u00a0\u00bb||28px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]

<\/h4>\n

<\/h4>\n

En plong\u00e9e <\/b><\/u><\/h5>\n
<\/h5>\n
Les gorgones sont pr\u00e9sentes dans toutes les mers et tous les oc\u00e9ans du monde.<\/h5>\n
Elles vivent dans les zones c\u00f4ti\u00e8res peu profondes, souvent fix\u00e9es \u00e0 des roches. On peut aussi trouver certaines esp\u00e8ces sur des fonds sableux ou \u00e0 des centaines de m\u00e8tre de profondeur.<\/h5>\n
Les gorgones sont des abris pour de tr\u00e8s nombreuses esp\u00e8ces marines. Cela vaut donc la peine de s\u2019approcher et de d\u00e9tailler les branches\u00a0!<\/h5>\n
Un peuplement particulier de gorgones a \u00e9t\u00e9 d\u00e9couvert il y a quelques dizaines d\u2019ann\u00e9es au large de la rade nord de Marseille entre 50 et 60 m\u00e8tres de profondeur. Ce peuplement occupe un vaste plateau rocheux qui s\u2019\u00e9tend sur presque 2500 hectares (plus grand que Disneyland Paris ou \u00e9quivalent \u00e0 312 piscines olympiques!!).<\/h5>\n
Il se caract\u00e9rise par une forte densit\u00e9 de gorgones, mais surtout par la pr\u00e9sence de colonies g\u00e9antes (entre 1,50 et 1,80 m\u00e8tre de hauteur). L\u2019\u00e2ge pr\u00e9sum\u00e9 de <\/span><\/span><\/span>ces <\/span><\/span><\/span>colonies avoisine sans doute le si\u00e8cle\u00a0! <\/span><\/span><\/span><\/h5>\n

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Pour aller plus loin<\/b><\/u><\/span><\/p>\n

– <\/span><\/span>Les gorgones appartiennent au grand groupe des Cnidaires <\/span><\/span><\/span>(comme l<\/span><\/span><\/span>es coraux, m\u00e9duses et an\u00e9mones)<\/span><\/span><\/span><\/span><\/span><\/p>\n

– nom scientifique\u00a0: <\/span><\/span>Gorgonacea<\/span><\/p>\n

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On ne peut pas les rater tellement elles sont spectaculaires: rouges, bleues, mauves, oranges, jaunes ou encore blanches, les gorgones sont \u00e0 la fois magnifiques et fragiles tel un \u00e9ventail […]<\/p>\n","protected":false},"author":15,"featured_media":243978,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[170,64],"tags":[],"class_list":["post-243872","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-billets-de-la-com","category-commission-bio","et-has-post-format-content","et_post_format-et-post-format-standard"],"_links":{"self":[{"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/posts\/243872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/comments?post=243872"}],"version-history":[{"count":28,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/posts\/243872\/revisions"}],"predecessor-version":[{"id":243979,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/posts\/243872\/revisions\/243979"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/media\/243978"}],"wp:attachment":[{"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/media?parent=243872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/categories?post=243872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subamacon.com\/index.php\/wp-json\/wp\/v2\/tags?post=243872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}