{"id":6050,"date":"2014-01-20T08:00:52","date_gmt":"2014-01-20T07:00:52","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=6050"},"modified":"2014-01-09T22:27:21","modified_gmt":"2014-01-09T21:27:21","slug":"semaine-04-2014","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-04-2014","title":{"rendered":"Semaine 04-2014"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0La vie est un d\u00e9fi \u00e0 relever, un bonheur \u00e0 m\u00e9riter, une aventure \u00e0 tenter.\u00a0\u00bb<\/p>\n

M\u00e8re Teresa<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Bigorneau\"<\/a>
Bigorneau (Roscoff, f\u00e9vrier 2007)<\/figcaption><\/figure>\n

  <\/p>\n

Le Bigorneau (Littorina littorea<\/em>) est un repr\u00e9sentant de la famille des Littorinid\u00e9s, au sein du groupe des Mollusques Gast\u00e9ropodes.<\/p>\n

Il a fait l’objet de l’article de la semaine 03-2014<\/a>.<\/p>\n

  <\/p>\n

Dans cette esp\u00e8ce, les sexes sont s\u00e9par\u00e9s : il existe des individus femelles et des individus m\u00e2les. Elle est qualifi\u00e9e de gonochorique.<\/p>\n

La reproduction peut intervenir toute l’ann\u00e9e mais elle se d\u00e9roule pr\u00e9f\u00e9rentiellement au printemps.<\/p>\n

\u00c0 la faveur d’un accouplement, le m\u00e2le transf\u00e8re des spermatozo\u00efdes \u00e0 la femelle.<\/p>\n

Peu apr\u00e8s, celle-ci \u00e9met dans le milieu de petites capsules. Elles sont compos\u00e9es d’une enveloppe g\u00e9latineuse qui abrite quelques \u0153ufs (au maximum cinq).<\/p>\n

  <\/p>\n

Le d\u00e9veloppement embryonnaire<\/a> dure environ une semaine, alors que les capsules flottent dans l’eau.<\/p>\n

L’\u00e9closion lib\u00e8re des larves<\/a> qui \u00e9voluent dans le plancton.
\nApr\u00e8s un mois \u00e0 un mois et demi, elles subissent une m\u00e9tamorphose<\/a> qui les transforme en individus juv\u00e9niles<\/a>, vivant sur le substrat.<\/p>\n

La premi\u00e8re reproduction intervient vers l’\u00e2ge de deux ans, alors que la coquille atteint une hauteur de 15 mm environ.<\/p>\n

  <\/p>\n

Les jeunes individus arborent souvent des coquilles de couleur claire, allant du beige au roux ou au brun.<\/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 SCOUPPE Christian, ZIEMSKI Fr\u00e9d\u00e9ric, in : DORIS, 13\/8\/2009 : Littorina littorea (Linnaeus, 1758)<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=1655)<\/p>\n

  <\/p>\n

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

Une citation \u00ab\u00a0La vie est un d\u00e9fi \u00e0 relever, un bonheur \u00e0 m\u00e9riter, une aventure \u00e0 tenter.\u00a0\u00bb M\u00e8re Teresa   Une image   Le Bigorneau (Littorina littorea) est un repr\u00e9sentant de la famille des Littorinid\u00e9s, au sein du groupe des Mollusques Gast\u00e9ropodes. Il a fait l’objet de l’article de la semaine 03-2014.   Dans cette […]<\/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":[28,12,23],"class_list":["post-6050","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-mollusque","tag-observation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t