{"id":25301,"date":"2026-04-10T18:18:02","date_gmt":"2026-04-10T16:18:02","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=25301"},"modified":"2026-04-10T18:34:17","modified_gmt":"2026-04-10T16:34:17","slug":"descobrint-la-riera-de-corbera-amb-els-ecolegs-de-linstitut-ffig","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/descobrint-la-riera-de-corbera-amb-els-ecolegs-de-linstitut-ffig\/","title":{"rendered":"Descobrint la riera de Corbera amb els ec\u00f2legs de l’institut FFiG"},"content":{"rendered":"

Aquest dijous dia 9 d\u2019abril l\u2019alumnat de biologia de primer i segon de batxillerat de l\u2019institut Francesc Ferrer i Gu\u00e0rdia<\/a> de Sant Joan Desp\u00ed ha investigat l\u2019estat de salut de la riera de Corbera a l\u2019al\u00e7ada de Sant Andreu de la Barca. Aquest projecte d\u2019investigaci\u00f3 en limnologia representa un estudi complert i exhaustiu de l\u2019ecosistema aqu\u00e0tic en el que l\u2019alumnat investiga els par\u00e0metres fisicoqu\u00edmics de la riera, els animals que hi habiten i el bosc de ribera.<\/p>\n

Habitualment, aquest estudi el realitzem a la riera de Vallvidrera, a l\u2019entorn del Camp d\u2019Aprenentatge Can Santoi<\/a> situat a la Serra de Collserola, per\u00f2 degut a les actuals restriccions d\u2019acc\u00e9s al parc natural per la pesta porcina africana hem despla\u00e7at aquesta activitat a rieres properes. Hem seleccionat la riera de Corbera per la seva idiosincr\u00e0sia amb cursos d\u2019aigua fluvial permanents durant tot l\u2019any i localitzaci\u00f3 geogr\u00e0fica semblant a la riera de Vallvidrera; ambdues afluents del riu Llobregat i situades a una dist\u00e0ncia pr\u00e0cticament igual a la seva desembocadura al mar.<\/p>\n

L’alumat ha iniciat l\u2019activitat caminant fins a les proximitats del Gorg de la Mola, la nostra nova zona d\u2019estudi, carregats amb dues motxilles de Can Santoi per grup: una carregada amb el material per a l\u2019an\u00e0lisi ambientat i f\u00edsico-qu\u00edmic i l\u2019altra amb el material necessari per a la recol\u00b7lecci\u00f3 d\u2019animals aqu\u00e0tics i la seva caracteritzaci\u00f3.<\/p>\n

Quan l\u2019alumnat ha arribat al tram d\u2019an\u00e0lisi s\u2019ha distribu\u00eft en 6 grups de treball i s\u2019ha situat amb dades topogr\u00e0fiques mitjan\u00e7ant GPS. Posteriorment ha iniciat la recollida de dades de camp ambientals (temperatura, direcci\u00f3 del curs de l\u2019aigua, granulometria de la llera i cobertura vegetal). Amb l\u2019ajuda dels companys de l’institut que cursen la mat\u00e8ria de geologia i ci\u00e8ncies ambientals i la informaci\u00f3 de la web de l\u2019institut geol\u00f2gic de Catalunya<\/a> han determinat que el substrat de la riera \u00e9s una barreja de gresos i argiles del tri\u00e0sic (Buntsandstein). Si voleu explorar la conca de la riera de Corbera o de qualsevol riera o riu de l’estat espanyol ho podeu fer aqu\u00ed.\u00a0<\/a><\/p>\n

Han seguit el seu estudi amb la recollida de dades hidrodin\u00e0miques (velocitat de l\u2019aigua, \u00e0rea de la secci\u00f3 transversal i cabal, que podeu acabar de calcular aqu\u00ed<\/a>) i fisicoqu\u00edmiques de l\u2019aigua (temperatura, color, olor, transpar\u00e8ncia amb el disc de sechi); han recollit aigua amb un pot de topassi per a l\u2019an\u00e0lisi posterior de pH, duresa, concentracions de nitrits i nitrats, fosfats, conductivitat, mineralitzaci\u00f3, oxigen dissolt i percentatge de saturaci\u00f3 d\u2019oxigen al nostre laboratori a l\u2019aire lliure. Han analitzat tamb\u00e9 l\u2019activitat antr\u00f2pica i han recollit una bona quantitat de deixalles, fins i tot pots sencers de detergent! Conservem Sant Andreu de la Barca i el seu patrimoni natural net!<\/p>\n

Han finalitzat l\u2019estudi amb l\u2019an\u00e0lisi de la flora del bosc de ribera i han aplicat l\u2019\u00edndex de qualitat del bosc de ribera (QRISI) seguint les directrius del projecte rius<\/a>, de ci\u00e8ncia ciutadana i col\u00b7laboratiu amb diferents entitats i persones per tal de seguir, con\u00e8ixer i catalogar l\u2019estat de salut dels ecosistemes aqu\u00e0tics de Catalunya.<\/p>\n

Despr\u00e9s d\u2019esmorzar sota l\u2019ombra d\u2019un roure immens a la fresqueta de la riera l\u2019alumnat ha ca\u00e7at invertebrats (i algun peix barb cua roja) per caracteritzar-los m\u00e9s tard amb les lupes. Han identificat una bona colla d\u2019invertebrats, que, a partir de l\u2019\u00edndex bi\u00f2tic que tenen assignat, s\u00f3n els millors indicadors de la qualitat de l\u2019aigua. Han trobat larves de lib\u00e8l\u00b7lula, ef\u00edmeres, mosca negre, mosquit d\u2019eixam, gambetes d\u2019aigua dol\u00e7a (l\u2019\u00fanic crustaci), cucs de terra, sangoneres, barretets, cargols de fang, d\u00edpters, espiadimonis,… Tot i la varietat, la qualitat del l\u2019aigua \u00e9s mediocre, tot i que els valors s\u00f3n propers a la qualificaci\u00f3 de bona. Una bona sorpresa. Per cert, han retornat tots els animals a la riera per no alterar el curs natural d’aquest ecosistema.<\/p>\n

Han fet un magn\u00edfic diagn\u00f2stic de l\u2019estat de la riera! Tant, que us proposem que envieu les vostres dades al projecte rius! Us animem a seguir estudiant l\u2019ecologia de camp i que us engresqueu for\u00e7a a con\u00e8ixer i redescobrir el patrimoni natural que atresora la comarca del Baix Llobregat! Molt de vosaltres n\u2019heu quedat encantats! Enhorabona per la magn\u00edfica tasca realitzada. Ens retrobem ben aviat amb noves activitats al Camp d’aprenentatge de Can Santoi, us atreviu amb el c\u00e0lcul del risc d’inundaci\u00f3 de la riera<\/a>?<\/p>\n

Ciao!<\/p>\n\r\n\t

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    Us deixem amb un recull de fotos de la jornada d’avui! Fins aviat!<\/p>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    Aquest dijous dia 9 d\u2019abril l\u2019alumnat de biologia de primer i segon de batxillerat de l\u2019institut Francesc Ferrer i Gu\u00e0rdia de Sant Joan Desp\u00ed ha investigat l\u2019estat de salut de la riera de Corbera a l\u2019al\u00e7ada de Sant Andreu de la Barca. Aquest projecte d\u2019investigaci\u00f3 en limnologia representa un estudi complert i exhaustiu de l\u2019ecosistema […]<\/p>\n","protected":false},"author":3,"featured_media":25307,"comment_status":"open","ping_status":"open","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":"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":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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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