{"id":7020,"date":"2015-02-02T08:00:19","date_gmt":"2015-02-02T07:00:19","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=7020"},"modified":"2015-01-23T19:12:13","modified_gmt":"2015-01-23T18:12:13","slug":"semaine-06-2015","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-06-2015","title":{"rendered":"Semaine 06-2015"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Aime la v\u00e9rit\u00e9 mais pardonne \u00e0 l&rsquo;erreur.\u00a0\u00bb<\/p>\n<p>Voltaire<\/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\/Echinocardium_DSCN3832-WEB.JPG\" target=\"blank\"><img decoding=\"async\" src=\"\/documents\/images\/Echinocardium_DSCN3832-WEB.JPG\" width=\"300\" alt=\"Oursin coeur\" class \/><\/a><figcaption class=\"wp-caption-text\">Oursin de sable (Crozon, f\u00e9vrier 2005)<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p>L&rsquo;Oursin de sable (<em>Echinocardium cordatum<\/em>) est un repr\u00e9sentant du groupe des \u00c9chinodermes et plus particuli\u00e8rement des \u00c9chinides, \u00e0 l&rsquo;instar des Oursins violet et vert ayant fait l&rsquo;objet des articles des semaines <a href=\"\/codex\/semaine-36-2014\">36-2014<\/a> et <a href=\"\/codex\/semaine-43-2014\">43-2014<\/a> respectivement. Il appartient \u00e0 la famille des Lov\u00e9niid\u00e9s.<\/p>\n<p>Cet animal marin fr\u00e9quente les milieux meubles, et notamment les sables dont les grains sont moyens ou fins. Il y vit enfoui dans un terrier situ\u00e9 \u00e0 environ 100 mm de la surface et communiquant avec elle par un conduit.<br \/>\nIl est pr\u00e9sent depuis la partie inf\u00e9rieure de la zone intertidale, alternativement couverte et d\u00e9couverte par la mar\u00e9e, jusqu&rsquo;\u00e0 une profondeur de 15 m\u00e8tres le plus souvent mais elle peut atteindre 200 m\u00e8tres environ.<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;Oursin de sable est ais\u00e9ment identifi\u00e9 \u00e0 sa forme, sa taille, sa couleur et aux caract\u00e9ristiques de ses piquants.<\/p>\n<p>Le corps a une forme l\u00e9g\u00e8rement allong\u00e9e, bomb\u00e9e sur le dessus et plate sur le dessous.<br \/>\nIl est entour\u00e9 d&rsquo;une enveloppe rigide et continue, le test, recouvert de l&rsquo;\u00e9piderme et portant des expansions, les piquants.<br \/>\nL&rsquo;une des extr\u00e9mit\u00e9s est plus large que l&rsquo;autre et porte une \u00e9chancrure peu profonde conf\u00e9rant \u00e0 l&rsquo;animal une forme de c\u0153ur qui appara\u00eet nettement lorsque test est d\u00e9barrass\u00e9 de ses piquants.<br \/>\nLa bouche est situ\u00e9e sur le dessous, du c\u00f4t\u00e9 \u00e9largi, sa localisation d\u00e9terminant l&rsquo;avant.<\/p>\n<p>La longueur de l&rsquo;animal est le plus souvent de 60 mm environ mais elle peut atteindre 90 mm.<br \/>\nIl arbore une couleur jaune p\u00e2le ou brun\u00e2tre. <\/p>\n<p>La partie sup\u00e9rieure porte de nombreux piquants jaun\u00e2tres \u00e0 gris, principalement orient\u00e9s vers l&rsquo;arri\u00e8re. Relativement souples et non dress\u00e9s, ils donnent l&rsquo;impression de la pr\u00e9sence d&rsquo;une fourrure. La r\u00e9gion inf\u00e9rieure est quant \u00e0 elle munie de piquants en spatule, dont l&rsquo;extr\u00e9mit\u00e9 libre est \u00e9largie et aplatie.<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;Oursin de sable se nourrit de particules organiques de petite taille pr\u00e9sentes entre les grains de sable ou d\u00e9pos\u00e9es \u00e0 la surface du s\u00e9diment.<br \/>\nIl obtient les premi\u00e8res en ing\u00e9rant le sable autour de lui et les secondes en glanant les d\u00e9p\u00f4ts situ\u00e9s autour du conduit reliant son terrier \u00e0 la surface.<br \/>\nDes piquants sp\u00e9cialis\u00e9s ainsi que des expansions souples et mobiles, appel\u00e9es pied ambulacraires, contribuent \u00e0 la prise alimentaire.<\/p>\n<p>En raison des dimensions des particules ing\u00e9r\u00e9es, bien plus petites que l&rsquo;organisme, l&rsquo;esp\u00e8ce est qualifi\u00e9e de microphage. Les modalit\u00e9s de pr\u00e9l\u00e8vement de ces particules sont caract\u00e9ristiques d&rsquo;un animal \u00e0 la fois psammivore (litt\u00e9ralement \u00ab\u00a0qui mange du sable\u00a0\u00bb) et d\u00e9positivore (litt\u00e9ralement \u00ab\u00a0qui mange des particules d\u00e9pos\u00e9es\u00a0\u00bb).<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;Oursin de sable est une esp\u00e8ce gonochorique, dans laquelle il existe des individus m\u00e2les, produisant des spermatozo\u00efdes, et des individus femelles, formant des ovules.<\/p>\n<p>La p\u00e9riode de reproduction varie avec la situation g\u00e9ographique. Elle  intervient \u00e0 la fin du printemps et en \u00e9t\u00e9 en Bretagne.<\/p>\n<p>M\u00e2les et femelles lib\u00e8rent leurs gam\u00e8tes dans l&rsquo;eau de mer o\u00f9 se d\u00e9roule la f\u00e9condation. <\/p>\n<p>Au terme d&rsquo;un court <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#developpement-embryonnaire\" target=\"_blank\">d\u00e9veloppement embryonnaire<\/a>, les <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#oeuf\" target=\"_blank\">\u0153ufs<\/a> \u00e9closent donnant naissance \u00e0 des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#larve\" target=\"_blank\">larves<\/a> planctoniques. Apr\u00e8s au plus une douzaine de jours, elles pr\u00e9sentent une forme caract\u00e9ristique munie de douze bras allong\u00e9s. Elle est appel\u00e9e \u00e9chinoplut\u00e9us. <\/p>\n<p>Durant les trois \u00e0 douze jours suivants, elles tombent sur 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 rapide <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#metamorphose\" target=\"_blank\">m\u00e9tamorphose<\/a>.<\/p>\n<p>La maturit\u00e9 sexuelle est atteinte \u00e0 deux ou trois ans alors que la dur\u00e9e de vie semble \u00eatre d&rsquo;une dizaine d&rsquo;ann\u00e9es.<\/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>et notamment<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>la fiche <a href=\"http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=709\" target=\"_blank\">COELHO-MANDES Delphine, ANDR\u00c9 Fr\u00e9d\u00e9ric, M\u00dcLLER Yves, P\u00c9AN Michel,  in : DORIS, 1\/5\/2014 : Echinocardium cordatum (Pennant, 1777)<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=709)<\/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\u00a0Aime la v\u00e9rit\u00e9 mais pardonne \u00e0 l&rsquo;erreur.\u00a0\u00bb Voltaire &nbsp; Une image &nbsp; L&rsquo;Oursin de sable (Echinocardium cordatum) est un repr\u00e9sentant du groupe des \u00c9chinodermes et plus particuli\u00e8rement des \u00c9chinides, \u00e0 l&rsquo;instar des Oursins violet et vert ayant fait l&rsquo;objet des articles des semaines 36-2014 et 43-2014 respectivement. Il appartient \u00e0 la famille des [&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":[28,45,23],"class_list":["post-7020","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-echinoderme","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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