{"id":6518,"date":"2014-07-07T08:00:11","date_gmt":"2014-07-07T06:00:11","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=6518"},"modified":"2014-06-22T17:18:37","modified_gmt":"2014-06-22T15:18:37","slug":"semaine-28-2014","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-28-2014","title":{"rendered":"Semaine 28-2014"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Chez beaucoup d’hommes, la parole pr\u00e9c\u00e8de la pens\u00e9e. Ils savent seulement ce qu’ils pensent apr\u00e8s avoir entendu ce qu’ils disent.\u00a0\u00bb<\/p>\n

G. Le Bon<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Cione\"<\/a>
Cione (siphon cloacal – Crozon, f\u00e9vrier 2009)<\/figcaption><\/figure>\n

  <\/p>\n

La Cione (Ciona intestinalis<\/em>) appartient au groupe des Ascidies, inclus dans celui des Urochord\u00e9s ou Tuniciers.
\nElle est un repr\u00e9sentant de la famille des Cionid\u00e9s.<\/p>\n

Elle a fait l’objet de l’article de la semaine 27-2014<\/a>.<\/p>\n

  <\/p>\n

La Cione est une esp\u00e8ce hermaphrodite : les individus produisent \u00e0 la fois des gam\u00e8tes m\u00e2les, les spermatozo\u00efdes, et des gam\u00e8tes femelles, les ovules.<\/p>\n

La reproduction intervient toute l’ann\u00e9e.<\/p>\n

Les gam\u00e8tes sont lib\u00e9r\u00e9s dans l’eau de mer par le siphon exhalant au niveau duquel le spermiducte et l’oviducte, conduits \u00e9vacuateurs du testicule et de l’ovaire respectivement, d\u00e9bouchent.<\/p>\n

La f\u00e9condation a lieu dans le milieu, elle est externe. Elle est \u00e0 l’origine d’un \u0153uf<\/a> qui sombre dans la colonne d’eau et peut adh\u00e9rer au fond.<\/p>\n

Apr\u00e8s un court d\u00e9veloppement embryonnaire<\/a> dont la dur\u00e9e est de l’ordre de 24 heures, l’\u00e9closion lib\u00e8re une larve<\/a> appel\u00e9e t\u00eatard en raison de sa forme : renfl\u00e9e \u00e0 l’avant, elle est munie d’une expansion post\u00e9rieure correspondant \u00e0 une queue.<\/p>\n

Le t\u00eatard \u00e9volue dans le plancton pendant une br\u00e8ve p\u00e9riode, g\u00e9n\u00e9ralement de quelques heures mais pouvant atteindre six jours.
\nIl est assure la dispersion de l’esp\u00e8ce.<\/p>\n

La larve gagne alors un support sur lequel elle se fixe gr\u00e2ce \u00e0 des papilles adh\u00e9sives, puis se m\u00e9tamorphose<\/a> en individu juv\u00e9nile<\/a>.<\/p>\n

La dur\u00e9e de vie d’une Cione est le plus souvent d’un an mais elle peut se prolonger jusqu’\u00e0 trois ans.<\/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 SCAPS Patrick, ANDR\u00c9 Fr\u00e9d\u00e9ric, ZIEMSKI Fr\u00e9d\u00e9ric, in : DORIS, 24\/2\/2011 : Ciona intestinalis (Linnaeus, 1767)<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=211)<\/p>\n

• <\/span>le site Marlin<\/a> (The marine life information network \u2013 en anglais \u2013 adresse http:\/\/www.marlin.ac.uk)<\/p>\n

  <\/p>\n

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

Une citation \u00ab\u00a0Chez beaucoup d’hommes, la parole pr\u00e9c\u00e8de la pens\u00e9e. Ils savent seulement ce qu’ils pensent apr\u00e8s avoir entendu ce qu’ils disent.\u00a0\u00bb G. Le Bon   Une image   La Cione (Ciona intestinalis) appartient au groupe des Ascidies, inclus dans celui des Urochord\u00e9s ou Tuniciers. Elle est un repr\u00e9sentant de la famille des Cionid\u00e9s. Elle […]<\/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":""},"categories":[1],"tags":[28,23,46],"class_list":["post-6518","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-observation","tag-urochorde"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/6518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/comments?post=6518"}],"version-history":[{"count":7,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/6518\/revisions"}],"predecessor-version":[{"id":6522,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/6518\/revisions\/6522"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=6518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=6518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=6518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}