{"id":7943,"date":"2015-11-09T08:00:19","date_gmt":"2015-11-09T07:00:19","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=7943"},"modified":"2015-11-02T20:24:52","modified_gmt":"2015-11-02T19:24:52","slug":"semaine-46-2015","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-46-2015","title":{"rendered":"Semaine 46-2015"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Tous les hommes pensent que le bonheur se trouve au sommet de la montagne alors qu&rsquo;il r\u00e9side dans la fa\u00e7on de la gravir.\u00a0\u00bb<\/p>\n<p>Confucius<\/p>\n<p> &nbsp; <\/p>\n<h2>Une image<\/h2>\n<figure style=\"width: 300px\" class=\"wp-caption alignnone\"><a rel=\"lightbox\" href=\"\/documents\/images\/Donax_sp05_11enfouissement-WEB.JPG\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/Donax_sp05_11enfouissement-WEB.JPG\" width=\"300\" alt=\"Donace\" class \/><\/a><figcaption class=\"wp-caption-text\">Donace (Crozon, f\u00e9vrier 2011)<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p>La Donace (<em>Donax vittatus<\/em>) est un animal marin appartenant au groupe des Mollusques bivalves, au sein duquel elle repr\u00e9sente la famille des Donacid\u00e9s.<\/p>\n<p>Cette esp\u00e8ce affectionne les milieux sableux mod\u00e9r\u00e9ment expos\u00e9s, dans le substrat desquels elle vit enfouie \u00e0 proximit\u00e9 de la surface.<br \/>\nElle est capable de s&rsquo;ensevelir rapidement en \u00e9tendant son pied vers le bas, en le dilatant gr\u00e2ce \u00e0 un afflux d&rsquo;<a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#hemolymphe\" target=\"_blank\">h\u00e9molymphe<\/a>, et en l&rsquo;utilisant comme un point d&rsquo;ancrage pour se tracter.<\/p>\n<p>Elle est pr\u00e9sente depuis la partie moyenne de la zone intertidale, alternativement couverte et d\u00e9couverte par la mar\u00e9e, jusqu&rsquo;\u00e0 une profondeur de 20 m\u00e8tres environ.<\/p>\n<p> &nbsp; <\/p>\n<p>La Donace est identifi\u00e9e aux caract\u00e9ristiques de sa coquille, longue de 38 mm pour une hauteur de 15 mm au maximum.<\/p>\n<p>Elle est form\u00e9e de deux valves, droite et gauche, relativement plates et triangulaires.<br \/>\nLeur bord ant\u00e9rieur est largement arrondi alors que leur bord post\u00e9rieur est plus \u00e9troit.<br \/>\nLe sommet est situ\u00e9 et orient\u00e9 vers l&rsquo;arri\u00e8re.<\/p>\n<p>La face externe des valves est brillante et lisse, bien que de fins sillons concentriques et de l\u00e9g\u00e8res lignes radiales l&rsquo;ornent.<br \/>\nLa couleur de fond est blanch\u00e2tre, jaun\u00e2tre, ros\u00e2tre, brun clair ou violet. Des bandes color\u00e9es sont fr\u00e9quemment pr\u00e9sentes, \u00e0 disposition longitudinale ou radiale.<br \/>\nDe fines stries d&rsquo;accroissement sont \u00e9galement visibles, mat\u00e9rialis\u00e9es par des bandes claires.<\/p>\n<p>La face interne des valves est de m\u00eame brillante, de couleur principalement blanche, macul\u00e9e des taches jaunes p\u00e2les, oranges ou violettes.<br \/>\nElle pr\u00e9sente une ligne pall\u00e9ale nette indiquant l&rsquo;insertion du manteau et formant une profonde \u00e9chancrure post\u00e9rieure appel\u00e9e sinus pall\u00e9al. Cette derni\u00e8re correspond \u00e0 la marque des siphons constitu\u00e9s par l&rsquo;accolement et l&rsquo;allongement des bords droit et gauche du manteau.<br \/>\nLe bord ventral de la coquille est nettement cr\u00e9nel\u00e9 du c\u00f4t\u00e9 interne.<\/p>\n<p> &nbsp; <\/p>\n<p>La Donace est un animal <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#suspensivorie\" target=\"_blank\">suspensivore<\/a> : elle se nourrit de particules en suspension dans l&rsquo;eau de mer.<\/p>\n<p>\u00c0 mar\u00e9e haute, elle d\u00e9ploie deux siphons jusqu&rsquo;\u00e0 la surface du substrat. L&rsquo;eau de mer p\u00e9n\u00e8tre dans le siphon ventral qualifi\u00e9 d&rsquo;inhalant, baigne la cavit\u00e9 pall\u00e9ale et ressort par le siphon dorsal dit exhalant.<br \/>\nLe courant d&rsquo;eau est g\u00e9n\u00e9r\u00e9 par les battements des cils port\u00e9s par les cellules tapissant les branchies, localis\u00e9es dans la cavit\u00e9 pall\u00e9ale.<\/p>\n<p>Lors de son trajet, l&rsquo;eau traverse les branchies. Les particules en suspension qu&rsquo;elle v\u00e9hicule sont capt\u00e9es : d\u00e9tourn\u00e9es par les cils des cellules branchiales, elles sont conduites \u00e0 un sillon alimentaire, enrob\u00e9es de mucus et achemin\u00e9es vers la bouche.<\/p>\n<p>Se nourrissant de particules de petite taille obtenues en filtrant l&rsquo;eau de mer, la Donace pratique la <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#microphagie\" target=\"_blank\">microphagie<\/a> par <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#filtration\" target=\"_blank\">filtration<\/a>.<\/p>\n<p> &nbsp; <\/p>\n<p>La Donace est une esp\u00e8ce gonochorique : elle comprend des individus m\u00e2les formant des spermatozo\u00efdes, et des individus femelles produisant des ovules.<\/p>\n<p>La reproduction intervient du mois d&rsquo;avril au mois de septembre, mais principalement en \u00e9t\u00e9.<\/p>\n<p>M\u00e2les et femelles lib\u00e8rent leurs gam\u00e8tes dans l&rsquo;eau de mer o\u00f9 a lieu la f\u00e9condation.<br \/>\nElle donne naissance \u00e0 des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#oeuf\" target=\"_blank\">\u0153ufs<\/a>, dont le <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#developpement-embryonnaire\" target=\"_blank\">d\u00e9veloppement embryonnaire<\/a> dure deux \u00e0 trois jours.<br \/>\nL&rsquo;\u00e9closion lib\u00e8re des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#larve\" target=\"_blank\">larves<\/a> planctoniques munies d&rsquo;un voile cili\u00e9, appel\u00e9es v\u00e9lig\u00e8res.<\/p>\n<p>Apr\u00e8s trois \u00e0 quatre semaines de vie libre, elles gagnent le fond et se transforment en individus <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#juvenile\" target=\"_blank\">juv\u00e9niles<\/a> \u00e0 la faveur d&rsquo;une <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#metamorphose\" target=\"_blank\">m\u00e9tamorphose<\/a>.<\/p>\n<p>La maturit\u00e9 sexuelle est atteinte apr\u00e8s un an environ, pour une dur\u00e9e de vie variant de trois \u00e0 six, voire sept ans.<\/p>\n<p> &nbsp; <\/p>\n<p>Pour en savoir plus consulter :<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>le site <a href=\"http:\/\/doris.ffessm.fr\" target=\"_blank\">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<p><span style=\"color: #999999;\">&bull; <\/span>l&rsquo;article <a href=\"https:\/\/en.wikipedia.org\/wiki\/Donax_vittatus\" target=\"_blank\">Donax vittatus<\/a> du site anglais de Wikipedia<br \/>\n(adresse : https:\/\/en.wikipedia.org\/wiki\/Donax_vittatus ; consult\u00e9 le 26 octobre 2015)<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>le site <a href=\"http:\/\/www.marlin.ac.uk\/\" target=\"_blank\">Marlin<\/a> (The marine life information network \u2013 en anglais \u2013 adresse http:\/\/www.marlin.ac.uk)<\/p>\n<p> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0Tous les hommes pensent que le bonheur se trouve au sommet de la montagne alors qu&rsquo;il r\u00e9side dans la fa\u00e7on de la gravir.\u00a0\u00bb Confucius &nbsp; Une image &nbsp; La Donace (Donax vittatus) est un animal marin appartenant au groupe des Mollusques bivalves, au sein duquel elle repr\u00e9sente la famille des Donacid\u00e9s. Cette esp\u00e8ce [&hellip;]<\/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-7943","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<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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