{"id":6299,"date":"2014-04-14T08:00:29","date_gmt":"2014-04-14T06:00:29","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=6299"},"modified":"2015-11-11T19:05:40","modified_gmt":"2015-11-11T18:05:40","slug":"semaine-16-2014","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-16-2014","title":{"rendered":"Semaine 16-2014"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Un esprit noble ne pr\u00e9dit pas ce qu’il fait tant qu’il n’a pas fait ce qu’il pr\u00e9dit.\u00a0\u00bb<\/p>\n

Confucius<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Actinie<\/a>
Actinie fraise (Crozon, f\u00e9vrier 2009)<\/figcaption><\/figure>\n

  <\/p>\n

L\u2019Actinie fraise (Actinia fragacea<\/em>) est un repr\u00e9sentant du groupe des Cnidaires. Au sein des Anthozoaires, elle appartient \u00e0 la famille des Actiniid\u00e9s.<\/p>\n

Elle a fait l\u2019objet de l\u2019article de la semaine 15-2014<\/a>.<\/p>\n

  <\/p>\n

Hors de l’eau, \u00e0 mar\u00e9e basse, l’Actinie fraise r\u00e9tracte ses tentacules dans sa colonne.
\nElle prend alors la forme d’une sph\u00e8re dont les couleurs rappellent celles d’une fraise : de multiples points verd\u00e2tres sont diss\u00e9min\u00e9s sur un fond rouge.
\nCette ressemblance est \u00e0 l’origine du nom vernaculaire de l’esp\u00e8ce.<\/p>\n

  <\/p>\n

L’Actinie fraise est une esp\u00e8ce gonochorique : il existe des individus m\u00e2les et des individus femelles, les sexes sont s\u00e9par\u00e9s.<\/p>\n

La reproduction sexu\u00e9e implique la lib\u00e9ration des gam\u00e8tes m\u00e2les, ou spermatozo\u00efdes, et des gam\u00e8tes femelles, ou ovules, dans le milieu.
\nLa f\u00e9condation a lieu dans l’eau de mer.
\nLe d\u00e9veloppement embryonnaire<\/a> prend fin avec l’\u00e9closion qui lib\u00e8re une larve<\/a> appel\u00e9e planula.
\nApr\u00e8s avoir men\u00e9 une vie planctonique, elle se pose sur le substrat et se transforme en An\u00e9mone juv\u00e9nile<\/a>.<\/p>\n

Cette esp\u00e8ce est par ailleurs capable de reproduction asexu\u00e9e : chaque individu peut donner naissance \u00e0 deux individus fils par scission.
\nSeules des divisions mitotiques interviennent dans ce processus.<\/p>\n

  <\/p>\n

Pour en savoir plus, consulter :<\/p>\n

• <\/span>le site Doris<\/a> (Donn\u00e9es d\u2019observations pour la reconnaissance et l\u2019identification de la faune et de la flore subaquatiques \u2013 F\u00e9d\u00e9ration fran\u00e7aise d\u2019\u00e9tudes et de sports sous-marins \u2013 adresse : http:\/\/doris.ffessm.fr)<\/p>\n

et notamment<\/p>\n

• <\/span>la fiche ZIEMSKI Fr\u00e9d\u00e9ric, BORG David, in : DORIS, 28\/2\/2014 : Actinia fragacea Tugwell, 1856<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=912)<\/p>\n

  <\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Une citation \u00ab\u00a0Un esprit noble ne pr\u00e9dit pas ce qu’il fait tant qu’il n’a pas fait ce qu’il pr\u00e9dit.\u00a0\u00bb Confucius   Une image   L\u2019Actinie fraise (Actinia fragacea) est un repr\u00e9sentant du groupe des Cnidaires. Au sein des Anthozoaires, elle appartient \u00e0 la famille des Actiniid\u00e9s. Elle a fait l\u2019objet de l\u2019article de la semaine […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[28,39,23],"class_list":["post-6299","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-cnidaire","tag-observation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t