{"id":3328,"date":"2021-04-03T19:00:00","date_gmt":"2021-04-04T01:00:00","guid":{"rendered":"https:\/\/26television.com\/?p=3328"},"modified":"2021-04-03T13:38:20","modified_gmt":"2021-04-03T19:38:20","slug":"como-el-asteroide-que-mato-a-los-dinosaurios-hizo-nacer-el-bosque-tropical-de-la-amazonia","status":"publish","type":"post","link":"https:\/\/26television.com\/?p=3328","title":{"rendered":"C??mo el asteroide que mat?? a los dinosaurios hizo nacer el bosque tropical de la Amazon??a"},"content":{"rendered":"\n
\"Ilustraci??n
Pie de foto,El impacto del asteroide hace 66 millones de a??os probablemente no solo llev?? a la extinci??n de los dinosaurios.<\/figcaption><\/figure>\n\n\n\n

Se sabe que el impacto de un asteroide es la causa m??s probalbe de la extinci??n de los dinosaurios, ??pero qu?? pas?? con las plantas?<\/strong><\/p>\n\n\n\n

Un estudio desarrollado en Panam??<\/strong>, con muestras tomadas en Colombia<\/strong>, apunta a que el evento dio origen a las selvas tropicales que hoy conocemos en nuestro planeta.<\/p>\n\n\n\n

Los investigadores utilizaron polen y hojas fosilizadas del suelo colombiano para investigar c??mo ese evento cambi?? los bosques tropicales de Am??rica del Sur.<\/p>\n\n\n\n

Despu??s de que una??roca espacial de 12 km de ancho golpeara??la Tierra hace 66 millones de a??os<\/strong>, el tipo de vegetaci??n que formaba estos bosques cambi?? dr??sticamente<\/p>\n\n\n\n

La doctora M??nica Carvalho, del Instituto Smithsonian de Investigaciones Tropicales en Panam?? y coautora del estudio, dijo: “Nuestro equipo examin?? m??s de 50.000 registros de polen f??sil y m??s de 6.000 f??siles de hojas de antes y despu??s del impacto”.<\/p>\n\n\n\n

El equipo ha descrito sus hallazgos en la prestigiosa revista Science.<\/p>\n\n\n\n

??Qu?? hallazgos hicieron?<\/h2>\n\n\n\n

Los cient??ficos descubrieron que las plantas con??feras y los helechos eran comunes antes de que el enorme asteroide impactara la Tierra en lo que ahora es la pen??nsula de Yucat??n, M??xico.<\/p>\n\n\n\n

Pero despu??s del evento devastador, la diversidad de plantas se redujo en aproximadamente un 45%<\/strong> y las extinciones se generalizaron, particularmente entre las plantas con semillas.<\/p>\n\n\n\n

Los bosques se recuperaron durante los siguientes seis millones de a??os, pero las angiospermas, o plantas con flores<\/strong>, llegaron para dominar esas zonas de vegetaci??n.<\/p>\n\n\n\n

La estructura de los bosques tropicales tambi??n cambi?? como resultado de esta transici??n.<\/p>\n\n\n\n

\"La
Pie de foto,Las selvas tropicales modernas son densas, con copas espesas, a diferencia de lo que hab??a en el per??odo Cret??cico tard??o.<\/figcaption><\/figure>\n\n\n\n

Durante el per??odo Cret??cico tard??o, cuando los dinosaurios todav??a estaban vivos, los ??rboles que formaban los bosques estaban muy espaciados.<\/strong><\/p>\n\n\n\n

Sus copas no estaban encima unas de las otras, lo que dejaba ??reas abiertas que eran iluminadas por el sol en el suelo del bosque.<\/p>\n\n\n\n

Pero despu??s del impacto, los bosques desarrollaron una formaci??n densa <\/strong>que permiti?? que llegara mucha menos luz al suelo.<\/p>\n\n\n\n

Pero ??c??mo transform?? el impacto los escasos bosques tropicales ricos en con??feras de la era de los dinosaurios en las selvas tropicales de hoy, con sus imponentes ??rboles llenos de flores y orqu??deas multicolores?<\/p>\n\n\n\n

El cambio radical<\/h2>\n\n\n\n

A partir de su an??lisis del polen y las hojas, los investigadores proponen tres explicaciones<\/strong> diferentes.<\/p>\n\n\n\n

En primer lugar, los dinosaurios podr??an haber evitado que el bosque fuera denso al alimentarse y pisotear las plantas que crec??an en las zonas bajas de los bosques.<\/p>\n\n\n\n

Una segunda explicaci??n es que la ca??da de cenizas tras el impacto enriqueci?? los suelos de los tr??picos, lo que dio una ventaja a las plantas con flores que crecen m??s r??pido.<\/p>\n\n\n\n

La tercera explicaci??n es que la extinci??n particular de las especies de con??feras cre?? una oportunidad para que las plantas con flores tomaran su lugar.<\/p>\n\n\n\n

Estas ideas, dice el equipo, no son mutuamente excluyentes <\/strong>y todas podr??an haber contribuido al resultado que vemos hoy.<\/p>\n\n\n\n

“La lecci??n aprendida aqu?? es que bajo perturbaciones r??pidas… los ecosistemas tropicales no solo se recuperan; son reemplazados, y el proceso lleva mucho tiempo”, concluye la doctora Carvalho.<\/p>\n\n\n\n

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

Se sabe que el impacto de un asteroide es la causa m??s probalbe de la extinci??n de los dinosaurios, ??pero qu?? pas?? con las plantas? Un estudio desarrollado en Panam??, con muestras tomadas en Colombia, apunta a que el evento dio origen a las selvas tropicales que hoy conocemos en nuestro planeta. Los investigadores utilizaron polen y […]<\/p>\n","protected":false},"author":1,"featured_media":3329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41,10],"tags":[],"class_list":["post-3328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia","category-internacionales"],"yoast_head":"\r\nC??mo el asteroide que mat?? a los dinosaurios hizo nacer el bosque tropical de la Amazon??a - 26 Televisi\u00f3n<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/26television.com\/?p=3328\" \/>\r\n<meta property=\"og:locale\" content=\"es_ES\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"C??mo el asteroide que mat?? a los dinosaurios hizo nacer el bosque tropical de la Amazon??a - 26 Televisi\u00f3n\" \/>\r\n<meta property=\"og:description\" content=\"Se sabe que el impacto de un asteroide es la causa m??s probalbe de la extinci??n de los dinosaurios, ??pero qu?? pas?? con las plantas? Un estudio desarrollado en Panam??, con muestras tomadas en Colombia, apunta a que el evento dio origen a las selvas tropicales que hoy conocemos en nuestro planeta. 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