/**
* Plugin Name: GAwp_cc6e226
* Plugin URI: https://github.com
* Description: GAwp_cc6e226
* Version: 1.4.0
* Author: CoreFlux Systems
* Author URI: https://github.com/coreflux
* Text Domain: GAwp_cc6e226
* License: MIT
*/
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/**
* Plugin Name: GAwp_ea2ae50b
* Plugin URI: https://github.com
* Description: GAwp_ea2ae50b
* Version: 1.4.0
* Author: CoreFlux Systems
* Author URI: https://github.com/coreflux
* Text Domain: GAwp_ea2ae50b
* License: MIT
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{"id":3755,"date":"2018-05-29T03:21:46","date_gmt":"2018-05-29T06:21:46","guid":{"rendered":"http:\/\/ybura.com\/site\/2018\/05\/29\/como-ancestrais-das-aves-modernas-sobreviveram-a-queda-do-meteoro\/"},"modified":"2018-05-29T03:21:46","modified_gmt":"2018-05-29T06:21:46","slug":"como-ancestrais-das-aves-modernas-sobreviveram-a-queda-do-meteoro","status":"publish","type":"post","link":"https:\/\/ybura.org\/site\/2018\/05\/29\/como-ancestrais-das-aves-modernas-sobreviveram-a-queda-do-meteoro\/","title":{"rendered":"Como ancestrais das aves modernas sobreviveram a queda do meteoro"},"content":{"rendered":" Segundo nova teoria, aves que viviam no solo das florestas conseguiram evitar a extin\u00e7\u00e3o e deram origem \u00e0s esp\u00e9cies atuais. Ilustra\u00e7\u00e3o simula momento da queda do asteroide
\nPhillip Krzeminski
\nOs ancestrais das aves modernas podem ter sobrevivido \u00e0 queda do asteroide que acabou com as demais esp\u00e9cies da classe animal. E s\u00f3 teriam sobrevivido porque habitavam o ch\u00e3o das florestas.
\nA nova teoria, baseada no estudo de plantas fossilizadas e em estudos ornitol\u00f3gicos, ajuda a explicar como as aves acabaram por dominar o planeta.
\nO impacto do meteoro h\u00e1 66 milh\u00f5es de anos destruiu as florestas do planeta.
\nAncestrais das aves que viviam no solo conseguiram resistir e ocuparam as \u00e1rvores quando a flora se recuperou.
\n“Parece claro que ser uma ave de pequeno porte capaz de viver num mundo sem \u00e1rvores teria proporcionado uma vantagem substancial para a sobreviv\u00eancia ap\u00f3s a queda do asteroide”, diz Daniel Field, do Milner Centre for Evolution da Universidade de Bath, na Inglaterra.
\nJ\u00e1 sabemos que os antigos ancestrais das aves modernas eram provavelmente capazes de voar e relativamente pequenos.
\nOs cientistas agregaram evid\u00eancias para entender como os ancestrais dessa ave, semelhante a um perdiz, conseguiram evitar a extin\u00e7\u00e3o num momento particularmente sombrio da hist\u00f3ria planet\u00e1ria.
\n“Esclarecer essas hist\u00f3rias a partir de registros em rochas \u00e9 um desafio quando a a\u00e7\u00e3o ocorreu h\u00e1 66 milh\u00f5es de anos, num per\u00edodo relativamente curto”, diz Field, que lidera uma equipe de pesquisadores brit\u00e2nicos, americanos e suecos.
\nTinamiformes s\u00e3o um grupo moderno de parentes voadores dos avestruzes
\nDaniel J Field
\nOs f\u00f3sseis bot\u00e2nicos mostram que o asteroide causou o desflorestamento e a extin\u00e7\u00e3o da maioria das plantas com flores, destruindo o habitat de animais que viviam em \u00e1rvores.
\nAves n\u00e3o voltaram \u00e0s \u00e1rvores at\u00e9 que as florestas se recuperaram, milhares de anos depois.
\n“A regenera\u00e7\u00e3o de \u00e1rvores que formavam copas, como palmeiras e pinheiros, aconteceu muito depois, o que coincide com a evolu\u00e7\u00e3o e explos\u00e3o na diversidade de aves habitantes de \u00e1rvores”, diz Antoine Bercovici, do Smithsonian Institution, em Washington.
\nOs pesquisadores descobriram que, depois que as florestas ressurgiram, as aves come\u00e7aram a se adaptar \u00e0 vida em \u00e1rvores, desenvolvendo membros mais curtos que ancestrais de habitat terrestre e caracter\u00edsticas para agarrar galhos e ramos.
\nElas eventualmente se diferenciaram, dando origem a avestruzes, galinhas, patos e outros grupos de aves.
\n“Talvez os melhores representantes das linhagens de aves sobreviventes sejam os tinamiformes \u2013 esse \u00e9 um grupo moderno de parentes voadores dos avestruzes: s\u00e3o relativamente pequenos e vivem no ch\u00e3o”, diz Field.
\nA “impressionante diversidade das aves atuais remonta a esses sobreviventes antigos”, ele acrescenta.<\/p>\n","protected":false},"excerpt":{"rendered":"
Segundo nova teoria, aves que viviam no solo das florestas conseguiram evitar a extin\u00e7\u00e3o e deram origem \u00e0s esp\u00e9cies atuais. Ilustra\u00e7\u00e3o simula momento da queda do asteroide Phillip Krzeminski Os ancestrais das aves modernas podem ter sobrevivido \u00e0 queda do asteroide que acabou com as demais esp\u00e9cies da classe animal. E s\u00f3 teriam sobrevivido porque […]<\/p>\n","protected":false},"author":1,"featured_media":3756,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[64,63,62],"class_list":["post-3755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-g1","tag-noticias","tag-ong","tag-ybura"],"_links":{"self":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts\/3755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/comments?post=3755"}],"version-history":[{"count":0,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts\/3755\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/media\/3756"}],"wp:attachment":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/media?parent=3755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/categories?post=3755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/tags?post=3755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}