{"id":347,"date":"2009-11-17T18:14:08","date_gmt":"2009-11-17T17:14:08","guid":{"rendered":"http:\/\/www.2000sub.org\/news\/scoperta-la-centrale-energetica-delle-barriere-coralline.html"},"modified":"2015-10-21T16:10:43","modified_gmt":"2015-10-21T14:10:43","slug":"scoperta-la-centrale-energetica-delle-barriere-coralline","status":"publish","type":"post","link":"https:\/\/www.2000sub.org\/news\/scoperta-la-centrale-energetica-delle-barriere-coralline.html","title":{"rendered":"Scoperta la &#8216;centrale energetica&#8217; delle barriere coralline"},"content":{"rendered":"<p><strong>Le spugne della specie <em>Halisarca caerulea<\/em> crescono in profonde e oscure cavit&agrave; al di sotto delle barriere, e il 90 per cento della loro dieta &egrave; costituito da carbonio organico disciolto, che viene convertito in cellule cenocitiche utilizzabili da tutte le specie marine<\/strong><\/p>\n<p><img alt='barriere coralline' class=\"tac\" src='http:\/\/www.2000sub.org\/album\/kurt_amsler\/slides\/18.jpg' \/>Le barriere coralline supportano uno degli ecosistemi pi&ugrave; diversificati del pianeta, e possono vivere anche in una sorta di &ldquo;deserto marino&rdquo;. Ma come fanno a sostenere una tale abbondanza di vita?<\/p>\n<p>Ora il biologo marino Fleur Van Duyl del Regio istituto olandese per la ricerca marina ha analizzato il &ldquo;budget&rdquo; energetico che supporta le barriere coralline in un ambiente altrimenti molto povero.<\/p>\n<p>Insieme al collega Jasper De Goeij, ha cos&igrave; scoperto che le spugne della specie <em>Halisarca caerulea<\/em> crescono in profonde e oscure cavit&agrave; al di sotto delle barriere, e che il 90 per cento della loro dieta &egrave; costituito da carbonio organico disciolto, che risulta invece non sfruttabile dalla maggior parte delle specie residenti nelle barriere coralline.<\/p>\n<p>In particolare, secondo le misure dei due ricercatori, queste spugne dal colore vivo consumano ogni giorno una quantit&agrave; di carbonio pari alla met&agrave; del loro peso e hanno una proliferazione cellulare estremamente veloce, verificata grazie a una complessa marcatura del DNA con una sostanza denominata 5- bromo-2&prime;-deossiuridina (BrdU), anche se non crescono affatto.<\/p>\n<p>Ulteriori studi hanno consentito di verificare che le spugne rilasciano un gran numero di cellule cenocitiche nell&rsquo;ambiente circostante, che entrano nella catena alimentare delle specie che vivono nelle barriere coralline.<\/p>\n<p>&ldquo;<em>Halisarca caerulea <\/em>&egrave; la grande &lsquo;centrale di riciclaggio&rsquo; dell&rsquo;energia della barriera corallina, poich&eacute; riesce a convertire ci&ograve; che nessun&rsquo;altra specie utilizza, il carbonio organico disciolto, in energia universalmente utilizzabile: i cenociti che scarta&rdquo;, ha concluso De Goeij, che firma in proposito un articolo sulla rivista &quot;<em>Journal of Experimental Biology<\/em>&quot;.<br \/>&nbsp;<\/p>\n<div class=\"clearfix mb\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le spugne della specie Halisarca caerulea crescono in profonde e oscure cavit&agrave; al di sotto delle barriere, e il 90 per cento della loro dieta &egrave; costituito da carbonio organico<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-347","post","type-post","status-publish","format-standard","hentry","category-biologia-ambiente"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Scoperta la &#039;centrale energetica&#039; 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