{"id":17472,"date":"2016-04-05T11:17:39","date_gmt":"2016-04-05T10:17:39","guid":{"rendered":"https:\/\/cram.org\/ca\/?p=17472"},"modified":"2016-04-05T11:17:39","modified_gmt":"2016-04-05T10:17:39","slug":"la-canco-de-lhivern","status":"publish","type":"post","link":"https:\/\/cram.org\/ca\/la-canco-de-lhivern\/","title":{"rendered":"La can\u00e7\u00f3 de l\u2019hivern"},"content":{"rendered":"

Al fons del mar, les balenes i altres mam\u00edfers marins<\/strong><\/a> tenen grans dificultats per comunicar-se visualment perqu\u00e8 la llum nom\u00e9s penetra fins a una profunditat limitada. Per aquest motiu, molts animals marins han desenvolupat formes de comunicaci\u00f3 molt complexes mitjan\u00e7ant el so.<\/p>\n

Segurament heu sentit a dir que les balenes parlen, que poden advertir-se de perills, buscar altres individus perduts o fins i tot troben parella amb ajuda del so. En el medi aqu\u00e0tic, el so es transmet entre 4 i 5 vegades m\u00e9s r\u00e0pid que a l\u2019aire; aix\u00f2 permet a les balenes comunicar-se a centenars de metres de dist\u00e0ncia i fa que l\u2019o\u00efda sigui un sentit d’una import\u00e0ncia vital per a elles.<\/p>\n

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El que no \u00e9s tan conegut \u00e9s que algunes balenes, en concret les balenes iubartes (Megaptera novaeangliae<\/em>), no nom\u00e9s \u201cparlen\u201d, sin\u00f3 que tamb\u00e9 canten.<\/p>\n

Les balenes iubartes o balenes amb gep s\u00f3n animals migratoris que any rere any repeteixen el mateix viatge. A l\u2019estiu les podem trobar a latituds altes, alimentant-se en zones costaneres d\u2019elevada productivitat. Durant l\u2019hivern, es desplacen a zones subtropicals per aparellar-se, i \u00e9s en aquestes pistes de ball subaqu\u00e0tiques on els mascles ens delecten amb les seves curioses can\u00e7ons.<\/p>\n

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[column size=\u00bbone-half\u00bb][youtube src=\u00bbhttp:\/\/www.youtube.com\/embed\/Dqv8aWzOgmo\u00bb height=\u00bb300″ width=\u00bb200″][\/column][\/row]<\/p>\n

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Aquestes can\u00e7ons tenen una durada d\u2019entre 10 i 30 minuts i poden repetir-se en sessions d’unes quantes hores. S\u2019ha vist que les can\u00e7ons de les balenes provinents de diferents llocs varien; aix\u00ed doncs, cada zona t\u00e9 el seu propi \u201chit\u201d de l\u2019hivern. Per\u00f2 no solament canvien en l\u2019espai, sin\u00f3 que tamb\u00e9 ho fan en el temps. Durant els mesos hivernals les can\u00e7ons van evolucionant, els mascles hi van afegint noves estrofes i van canviant la duraci\u00f3 i freq\u00fc\u00e8ncia de les ja existents. Aquests canvis els assumeixen totes les balenes d\u2019una mateixa zona; per tant, podr\u00edem dir que entre totes componen una can\u00e7\u00f3 nova cada any.<\/p>\n

La finalitat d’aquestes can\u00e7ons encara no \u00e9s massa clara, tot i que la majoria de cient\u00edfics assenyalen que deu tenir relaci\u00f3 amb el festeig.<\/p>\n

\n

Si voleu con\u00e8ixer m\u00e9s detalls i curiositats del comportament d’aquests gegantescos cetacis, podeu assistir al curs dedicat a l’estudi dels cetacis<\/strong><\/a> que impartirem a la Fundaci\u00f3 CRAM el cap de setmana del 21-22 de maig.<\/h2>\n<\/blockquote>\n

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Al fons del mar, les balenes i altres mam\u00edfers marins tenen grans dificultats per comunicar-se visualment perqu\u00e8 la llum nom\u00e9s penetra fins a una profunditat limitada. Per aquest motiu, molts animals marins han desenvolupat formes de comunicaci\u00f3 molt complexes mitjan\u00e7ant el so. Segurament heu sentit a dir que les balenes parlen, que poden advertir-se […]<\/p>\n","protected":false},"author":1,"featured_media":17471,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[71],"tags":[],"class_list":["post-17472","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies"],"yoast_head":"\nLa can\u00e7\u00f3 de l\u2019hivern - CRAM<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cram.org\/ca\/la-canco-de-lhivern\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La can\u00e7\u00f3 de l\u2019hivern - CRAM\" \/>\n<meta property=\"og:description\" content=\"Al fons del mar, les balenes i altres mam\u00edfers marins tenen grans dificultats per comunicar-se visualment perqu\u00e8 la llum nom\u00e9s penetra fins a una profunditat limitada. 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