{"id":6879,"date":"2014-12-01T08:00:18","date_gmt":"2014-12-01T07:00:18","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=6879"},"modified":"2014-11-21T22:04:59","modified_gmt":"2014-11-21T21:04:59","slug":"semaine-49-2014","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-49-2014","title":{"rendered":"Semaine 49-2014"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0L’int\u00e9r\u00eat que j’ai \u00e0 croire une chose n’est pas une preuve de l’existence de cette chose.\u00a0\u00bb<\/p>\n

Voltaire<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Nasse<\/a>
Ponte de Nasse r\u00e9ticul\u00e9e (Carantec, f\u00e9vrier 2007)<\/figcaption><\/figure>\n

  <\/p>\n

La Nasse r\u00e9ticul\u00e9e (Nassarius reticulatus<\/em>) est un Mollusque gast\u00e9ropode appartenant \u00e0 la famille des Nassariid\u00e9s.<\/p>\n

Elle a fait l’objet de l’article de la semaine 48-2014<\/a>.<\/p>\n

  <\/p>\n

Dans cette esp\u00e8ce, les sexes sont s\u00e9par\u00e9s : il existe des individus m\u00e2les produisant des spermatozo\u00efdes et des individus femelles formant des ovules.<\/p>\n

La maturit\u00e9 sexuelle est atteinte \u00e0 l’\u00e2ge de trois ans et demi, et la reproduction intervient au printemps et en \u00e9t\u00e9.<\/p>\n

Le m\u00e2le transf\u00e8re des spermatozo\u00efdes \u00e0 la femelle \u00e0 la faveur d’un accouplement. La f\u00e9condation est interne.<\/p>\n

La femelle d\u00e9pose alors sur les Zost\u00e8res, les algues ou les rochers des capsules plates, circulaires et translucides, munies d’une ouverture apicale. Chacune de ces ooth\u00e8ques<\/a> contient environ 200 \u0153ufs<\/a>.<\/p>\n

L’\u00e9closion intervient trois \u00e0 cinq semaines apr\u00e8s l’oviposition, selon la temp\u00e9rature.
\nElle lib\u00e8re des larves<\/a> appel\u00e9es v\u00e9lig\u00e8res en raison de la pr\u00e9sence d’un velum, expansion cili\u00e9e impliqu\u00e9e dans la locomotion et l’alimentation. <\/p>\n

Apr\u00e8s cinq \u00e0 neuf semaines de vie planctonique, elles gagnent le fond et subissent une m\u00e9tamorphose<\/a> les transformant en individus juv\u00e9niles<\/a>. Ils se nourrissent principalement de petites particules d\u00e9pos\u00e9es sur le s\u00e9diment pendant les premiers mois de leur vie, pratiquant la d\u00e9positivorie.<\/p>\n

La dur\u00e9e de vie de la Nasse r\u00e9ticul\u00e9e est de l’ordre de 15 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 QUENNEHEN Evelyne, DE CISTERNES Aur\u00e9lie, DUCASSY Jean-Marie, in : DORIS, 2\/4\/2014 : Nassarius reticulatus (Linnaeus, 1758)<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=845)<\/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\u00a0L’int\u00e9r\u00eat que j’ai \u00e0 croire une chose n’est pas une preuve de l’existence de cette chose.\u00a0\u00bb Voltaire   Une image   La Nasse r\u00e9ticul\u00e9e (Nassarius reticulatus) est un Mollusque gast\u00e9ropode appartenant \u00e0 la famille des Nassariid\u00e9s. Elle a fait l’objet de l’article de la semaine 48-2014.   Dans cette esp\u00e8ce, les sexes sont […]<\/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-6879","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