{"id":295,"date":"2010-04-19T13:27:03","date_gmt":"2010-04-19T12:27:03","guid":{"rendered":"http:\/\/blocs.xtec.cat\/cdavallsdaneu\/?p=295"},"modified":"2010-04-19T13:27:03","modified_gmt":"2010-04-19T12:27:03","slug":"atencio-ocells-en-migracio","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/general\/atencio-ocells-en-migracio\/","title":{"rendered":"Atenci\u00f3: ocells en migraci\u00f3!"},"content":{"rendered":"

\"Martinet<\/a><\/p>\n

Vau guitar el martinet blanc (Egretta garzetta<\/em>) a la Mollera d’Escalarre?<\/p>\n

Nosaltres vam poder veure’l dijous, tant al mat\u00ed com al vespre. Dimecres tamb\u00e9 el van veure i no \u00fanicament un exemplar sin\u00f3 dos!<\/p>\n

I \u00e9s que aquests dies \u00e9s f\u00e0cil observar passos d’ocells en migraci\u00f3. Moltes esp\u00e8cies es dirigeixen cap al nord i durant el seu trajecte realitzen parades estrat\u00e8giques per alimentar-se iagafar forces. Aix\u00ed que ja podem parar atenci\u00f3 a veure qu\u00e8 passa pel pla d’Esterri i rodalies! La Mollera \u00e9s un bon lloc per veure’ls ja que \u00e9s una de les poques zones humides on els hi \u00e9s f\u00e0cil trobar rep\u00f2s i aliment.<\/p>\n

La migraci\u00f3 dels ocells \u00e9s un fenomen extraordinari. Milions d’ocells viatgen des de les \u00e0rees on han passat l’hivern\u00a0 fins a les seves zones de cria.\u00a0 A vegades aquestes dist\u00e0ncies poden ser molt grosses, com el cas de l’oreneta cuablanca que passa l’hivern al sud del S\u00e0hara (\u00c0frica) i ve a passar l’estiu a les nostres contrades.<\/p>\n

Per qu\u00e8 migren els ocells? Doncs per augmentar la seva superviv\u00e8ncia, all\u00e0 on van hi haur\u00e0 m\u00e9s aliment i bonan\u00e7a, i tamb\u00e9 per millorar el seu \u00e8xit reproductor! Els ocells que migren cap als pa\u00efsos n\u00f2rdics per nidificar tenen m\u00e9s hores de llum per alimentar i criar els seus polls, i es beneficien de les explosions temporals d’insectes i de la menor pres\u00e8ncia de depredadors que caracteritzen aquestes zones.<\/p>\n

Hi ha diferents tipus de migraci\u00f3 i nivells de migraci\u00f3:<\/p>\n

Parlem de migradors estivals<\/strong> quan les esp\u00e8cies s’estan i crien durant el nostre estiu i marxen a principis de tardor a passar l’hivern a altres contrades. \u00c9s el cas del falciot o de les orenetes.<\/p>\n

Els migradors hivernals<\/strong> s\u00f3n aquells ocells que decideixen venir a passar l’hivern a casa nostra. \u00c9s l’exemple d’alguns bernats pescaires que han vingut a passar l’hivern a les nostres contrades i ara marxen cap al nord a les seves zones de cria. Quan nom\u00e9s \u00e9s una part de la poblaci\u00f3 que migra, s’anomenen migradors parcials<\/strong>, en el mateix exemple no tots els bernats pescaires del nord d’Europa migren cap al sud a passar l’hivern, n’hi ha molts que el passen a les seves \u00e0rees de cria. El mateix cas \u00e9s el de la cadernera.<\/p>\n

Els migradors altitudinals <\/strong>s\u00f3n aquells que no fan grans trajectes sin\u00f3 que es desplacen muntanya avall per trobar millors condicions durant l’\u00e8poca d’hivern. \u00c9s el cas, per exemple, del grasset de muntanya que cria als prats alpins del Pirineu per\u00f2 baixa de cota durant els mesos freds de l’hivern.<\/p>\n

Doncs ens tocar\u00e0 est\u00e0 atents a veure si veiem m\u00e9s esp\u00e8cies de pas com el cas del martinet blanc observat a la mollera d’Escalarre.<\/p>\n

Equip del Camp d’Aprenentatge de les Valls d’\u00c0neu<\/p>\n","protected":false},"excerpt":{"rendered":"

Vau guitar el martinet blanc (Egretta garzetta) a la Mollera d’Escalarre? Nosaltres vam poder veure’l dijous, tant al mat\u00ed com […]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":"","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[287,1],"tags":[],"class_list":["post-295","post","type-post","status-publish","format-standard","hentry","category-fauna-salvatge","category-general"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/posts\/295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/comments?post=295"}],"version-history":[{"count":0,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/posts\/295\/revisions"}],"wp:attachment":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/media?parent=295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/categories?post=295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-vallsdaneu\/wp-json\/wp\/v2\/tags?post=295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}