{"id":3744,"date":"2022-02-04T10:35:41","date_gmt":"2022-02-04T09:35:41","guid":{"rendered":"https:\/\/agora.xtec.cat\/sescanet\/?p=3744"},"modified":"2022-02-04T10:35:41","modified_gmt":"2022-02-04T09:35:41","slug":"jo-tinc-la-bruixola-al-cap","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/sescanet\/stemnews\/jo-tinc-la-bruixola-al-cap\/","title":{"rendered":"Jo tinc la br\u00faixola al cap!"},"content":{"rendered":"

A l’hora de migrar no n’hi ha prou amb 5 sentits!<\/p>\n

Molts animals memoritzen el planisferi celeste o saben guiar-se pel Sol, per\u00f2 que passa quan est\u00e0 ennuvolat? O el dia es fa m\u00e9s llarg o m\u00e9s curt? Llavors cal espavilar-se d’una altra manera si vols continuar! Hi ha moltes de maneres de guiar-se: per les olors, pel so, etc. Fins i tot el magnetisme terrestre!<\/p>\n

La Terra funciona com un imant gegant i moltes esp\u00e8cies (sobretot animals migratoris), tenen una esp\u00e8cie de br\u00faixola magn\u00e8tica, capa\u00e7 de detectar els pols magn\u00e8tics terrestres i fer-se un mapa mental d’on s\u00f3n. Aix\u00f2 ho van demostrar els cient\u00edfics Friedrich W. Merkel i Wolfgang Wiltschko tancant un grup de pit-roigs en g\u00e0bies rodejats de bobines el\u00e8ctriques. Si les bobines canviaven el pol nord magn\u00e8tic de direcci\u00f3, els pit-roigs canviaven de ruta. Encara \u00e9s un misteri com s’ho fan per detectar el camp magn\u00e8tic terrestre. La teoria m\u00e9s acceptada \u00e9s la que la magnetita que alguns animals migratoris tenen a les neurones els ajuda a detectar les ones magn\u00e8tiques. Per\u00f2 hi ha diverses teories.<\/p>\n

Encara que ens costi tant de descobrir com s’ho fan, aix\u00f2 no \u00e9s tan estrany. Hi ha un munt d’esp\u00e8cies que utilitzen la br\u00faixola magn\u00e8tica, com ara les aus, les balenes, salamandres, rat-penats, tortugues, etc. De fet, sembla que som una de les poques esp\u00e8cies que no ho tenen!<\/p>\n

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

By Erica S\u00e1nchez… Llegeix m\u00e9s\u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":3745,"comment_status":"closed","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,"footnotes":""},"categories":[125],"tags":[],"class_list":["post-3744","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stemnews"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/posts\/3744","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/comments?post=3744"}],"version-history":[{"count":1,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/posts\/3744\/revisions"}],"predecessor-version":[{"id":3746,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/posts\/3744\/revisions\/3746"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/media\/3745"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/media?parent=3744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/categories?post=3744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/sescanet\/wp-json\/wp\/v2\/tags?post=3744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}