{"id":14429,"date":"2022-03-21T22:57:27","date_gmt":"2022-03-21T21:57:27","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=14429"},"modified":"2022-07-01T11:03:08","modified_gmt":"2022-07-01T09:03:08","slug":"gava-mar-troba-la-frigania-20-anys-despres","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/gava-mar-troba-la-frigania-20-anys-despres\/","title":{"rendered":"Gav\u00e0 Mar troba la frig\u00e0nia 20 anys despr\u00e9s"},"content":{"rendered":"<p>Aquest dilluns dia 21 de mar\u00e7 l&#8217;alumnat de 4t d&#8217;ESO de l&#8217;<a href=\"https:\/\/institutescolagavamar.cat\/\">Institut Escola Gav\u00e0 Mar<\/a> ha trobat exemplars de l&#8217;insecte del g\u00e8nere <strong>frig\u00e0nia<\/strong> 20 anys despr\u00e9s que el deix\u00e9ssim de veure a la riera de Vallvidrera<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14437 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/03\/muntatge_rie_gava_mar_p-1-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/03\/muntatge_rie_gava_mar_p-1.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/03\/muntatge_rie_gava_mar_p-1-150x150.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><span style=\"font-family: inherit; font-size: 1em;\">.<\/span><\/p>\n<p><span style=\"font-family: inherit; font-size: 1em;\">El grup de joves, des de l&#8217;\u00e0mbit de les ci\u00e8ncies, estan indagant la <strong>biodiversitat<\/strong> <strong>dels ecosistemes<\/strong>. Pr\u00e8via a la recerca d&#8217;avui, han realitzat una <strong>recerca en el sistema de dunes litorals protegides de Gav\u00e0<\/strong>, de la que n&#8217;han mesurat l&#8217;abund\u00e0ncia d&#8217;esp\u00e8cies i les influ\u00e8ncies antr\u00f2piques.<\/span><\/p>\n<p>La troballa de la reaparici\u00f3 de la frig\u00e0nia l&#8217;han fet en l&#8217;activitat d&#8217;aprenentatge en els <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/dinamica-dels-ecosistemes\/estudi-ecologic-de-la-riera-de-vallvidrera\/\">ecosistemes de la riera<\/a> que han escollit realitzar a Collserola, acompanyats per l&#8217;equip del <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/\">Camp d&#8217;aprenentatge de Can Santoi<\/a>. L&#8217;alumnat, coneixedor del tipus de dades que el calia, ha plantejat que el primer que necessitava obtenir \u00e9s la identificaci\u00f3 de les especies animals i vegetals de la riera, coneguda com la <strong>biocenosi<\/strong>. Tamb\u00e9 han vist la necessitat de complementar la recerca amb els par\u00e0metres fisicoqu\u00edmics del medi aqu\u00e0tic, conegut com el <strong>bi\u00f2top<\/strong>. Amb quin prop\u00f2sit? <strong>El prop\u00f2sit que hem compartit \u00e9s el de la preservaci\u00f3 de la qualitat de l&#8217;aigua<\/strong>. Per aix\u00f2, hem apr\u00e8s un dels sistemes de mesura de la qualitat de l&#8217;aig<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-14432 alignright\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/03\/frigania_p.jpg\" alt=\"\" width=\"250\" height=\"167\" \/>ua la riera de Vallvidrera i dels bosc de ribera, a partir de l&#8217;<strong>\u00edndex bi\u00f2tic<\/strong>.<\/p>\n<p>El grup s&#8217;ha despla\u00e7at fins la proximitat de l&#8217;antiga masia de Can Calopa de Baix. D&#8217;inici, els nois i noies han vist que es tracta d&#8217;una riera minsa, per\u00f2 aparentment neta. En primer lloc han extret dades del bi\u00f2top. Despr\u00e9s, de la biocenosi, han identificat la <strong>vegetaci\u00f3 dels bosc de ribera<\/strong>, plena de verns, algun pollancre i plataners, tamb\u00e9 de cr\u00e9ixens, cues de cavall, c\u00e0rex i diverses algues. De les <strong>esp\u00e8cies animals<\/strong> trobades destaquen: ef\u00edmeres, gambetes d&#8217;aigua dol\u00e7a, barretets, cargols de fang, espiadimonis, sabater, frig\u00e0nia, t\u00e0vec, mosca negra, lib\u00e8l\u00b7lula i salamandra. Seguint el sistema d&#8217;\u00edndex bi\u00f2tic, el qual assigna a cada esp\u00e8cie un n\u00famero indicador de la toler\u00e0ncia a la contaminaci\u00f3, hem obtingut una <strong>qualitat de l&#8217;aigua de mediocre<\/strong>, amb un valor indicador de 53. El <strong>bosc de ribera t\u00e9 un valor alt de salut<\/strong>.<\/p>\n<p>Tot el grup de nois i noies ha gaudit de la descoberta de tot aquest conjunt de macroinvertebrats que han trobat a l&#8217;aigua de la riera, comptant amb el suport de lupes binoculars i dedicant una bona estona a veure&#8217;n tots els <strong>detalls morfol\u00f2gics, les adaptacions al moviment, a l&#8217;alimentaci\u00f3, a la respiraci\u00f3 i els diversos cicles de vida<\/strong>. Creiem que el projecte ha estat \u00fatil i n&#8217;estem agra\u00efts de la troballa de la reaparici\u00f3 de la frig\u00e0nia a la riera de Vallvidrera.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aquest dilluns dia 21 de mar\u00e7 l&#8217;alumnat de 4t d&#8217;ESO de l&#8217;Institut Escola Gav\u00e0 Mar ha trobat exemplars de l&#8217;insecte del g\u00e8nere frig\u00e0nia 20 anys despr\u00e9s que el deix\u00e9ssim de veure a la riera de Vallvidrera. El grup de joves, des de l&#8217;\u00e0mbit de les ci\u00e8ncies, estan indagant la biodiversitat dels ecosistemes. Pr\u00e8via a la [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14437,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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 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