{"id":34500,"date":"2024-07-15T13:40:37","date_gmt":"2024-07-15T13:40:37","guid":{"rendered":"https:\/\/www.ull.es\/portal\/hipotesis\/?p=34500"},"modified":"2024-12-12T09:42:49","modified_gmt":"2024-12-12T09:42:49","slug":"la-importancia-de-las-extinciones-masivas","status":"publish","type":"post","link":"https:\/\/www.ull.es\/portal\/hipotesis\/la-importancia-de-las-extinciones-masivas\/","title":{"rendered":"La Importancia de las extinciones masivas"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"34500\" class=\"elementor elementor-34500\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e5e108d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e5e108d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7aac84d\" data-id=\"7aac84d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8e2472f elementor-widget elementor-widget-image\" data-id=\"8e2472f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! 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elementor - v3.9.2 - 21-12-2022 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#818a91;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#818a91;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<h1 style=\"margin-top: 0px;text-align: left\"><span style=\"color: #2c284d\"><span style=\"font-weight: 400\">La importancia de las extinciones masivas<\/span><\/span><\/h1><div style=\"font-family: ArgentumSans, sans-serif\"><div style=\"width: 455px\"><p style=\"line-height: 32px\"><span style=\"color: #e4cac8\">lunes 8 de enero de 2024 &#8211; 00:00 GMT+0000<\/span><\/p><p><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-1.png\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-34503\" src=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-1.png\" alt=\"\" width=\"664\" height=\"889\" srcset=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-1.png 664w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-1-224x300.png 224w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-1-375x502.png 375w\" sizes=\"(max-width: 664px) 100vw, 664px\" \/><\/a><\/p><\/div><div style=\"width: 325px\"><div style=\"margin-bottom: 13.5px;line-height: 32px\"><p><a style=\"float: left;cursor: pointer;line-height: 16px;padding: 0px 2px\" href=\"https:\/\/www.ull.es\/#facebook\" target=\"_blank\" rel=\"nofollow noopener\" target=\"_blank\" rel=\"noopener\"><span style=\"overflow: hidden;height: 1px;width: 1px;position: absolute !important\">Facebook<\/span><\/a><a style=\"float: left;cursor: pointer;line-height: 16px;padding: 0px 2px\" href=\"https:\/\/www.ull.es\/#x\" target=\"_blank\" rel=\"nofollow noopener\" target=\"_blank\" rel=\"noopener\"><span style=\"overflow: hidden;height: 1px;width: 1px;position: absolute !important\">X<\/span><\/a><a style=\"float: left;cursor: pointer;line-height: 16px;padding: 0px 2px\" href=\"https:\/\/www.ull.es\/#whatsapp\" target=\"_blank\" rel=\"nofollow noopener\" target=\"_blank\" rel=\"noopener\"><span style=\"overflow: hidden;height: 1px;width: 1px;position: absolute !important\">WhatsApp<\/span><\/a><a style=\"float: left;cursor: pointer;line-height: 16px;padding: 0px 2px\" href=\"https:\/\/www.ull.es\/#copy_link\" target=\"_blank\" rel=\"nofollow noopener\" target=\"_blank\" rel=\"noopener\"><span style=\"overflow: hidden;height: 1px;width: 1px;position: absolute !important\">Copy Lin<\/span><\/a><\/p><\/div><\/div><\/div><div style=\"margin-top: 20px;color: #3d3d3d;font-family: ArgentumSans, sans-serif\"><div style=\"margin-top: 20px\"><div style=\"color: #192d4f;font-family: ArgentumSans, sans-serif;background: #e4cac8;padding: 2px 8px;font-size: 11px;overflow: hidden\">\u00a0<\/div><\/div><\/div><p>A\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">lo largo de la historia natural\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de nuestro planeta, la fauna y\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">flora ha ido cambiando a medi<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">da que la evoluci\u00f3n ha ido generando nue<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">vas especies que van sustituyendo a otras\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que desaparecen. Sabemos que esto es as\u00ed\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">debido a que la paleontolog\u00eda ha demostra<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">do este recambio lento y continuo de unas\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">especies por otras mejor adaptadas. Pero\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">adem\u00e1s de estas extinciones de fondo, en\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">el pasado de la Tierra podemos encontrar\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">cortos episodios de extinci\u00f3n acelerada, con\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">efectos dram\u00e1ticos sobre la biodiversidad.<\/span><\/p><p>Estas extinciones masivas suelen explicarse mediante sucesos catastr\u00f3ficos que afectan\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">a los ecosistemas tales como r\u00e1pidos cam<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">bios clim\u00e1ticos, supervolcanes, explosiones\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de supernovas, impactos de meteoritos,\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">etc. La extinci\u00f3n de los dinosaurios que tuvo\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">lugar hace 65 millones de a\u00f1os y que marc\u00f3\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">el final de la Era Secundaria es sin duda el\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">evento de este tipo m\u00e1s conocido, aunque\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">no el \u00fanico ni el m\u00e1s importante. Estos even<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">tos no son tan excepcionales como podr\u00eda<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">mos pensar si tenemos en cuenta que s\u00f3lo\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">desde que comenz\u00f3 la Era Primaria (Paleo<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">zoico), hace 542 millones de a\u00f1os, el registro\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">f\u00f3sil muestra cinco extinciones masivas. No\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">obstante, la vida existe en la Tierra desde\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">hace unos 3700 millones de a\u00f1os y parece\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">razonable suponer que eventos de este tipo\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">afectaron a su desarrollo desde sus comien<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">zos.<\/span><\/p><p><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00a0<\/span><\/p><blockquote><p style=\"text-align: center\"><strong><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\"> \u00abEstas extinciones masivas<br \/>suelen explicarse mediante<br \/>sucesos catastr\u00f3ficos que<br \/>afectan a los ecosistemas tales<br \/>como r\u00e1pidos cambios clim\u00e1ticos,<br \/>supervolcanes, explosiones<br \/>de supernovas, impactos de<br \/>meteoritos, etc\u00bb.<\/span><\/strong><\/p><\/blockquote><p>La primera de estas 5 grandes extinciones tuvo lugar a finales del Periodo Ordov\u00edcico y comienzos del Periodo Sil\u00farico, hace\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">443 millones de a\u00f1os. Desapareci\u00f3 el 85%\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de las especies, quiz\u00e1 debido a una intensa\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">glaciaci\u00f3n, aunque m\u00e1s recientemente se ha\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">se\u00f1alado que la explosi\u00f3n de una superno<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">va fue la responsable de que la Tierra fuera\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">alcanzada por radiaciones con efectos leta<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">les para la vida.<\/span><\/p><p>La segunda gran extinci\u00f3n tuvo lugar en\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">el Dev\u00f3nico Superior, hace unos 370 millo<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">nes de a\u00f1os. La vida era diferente tras la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">extinci\u00f3n del Ordov\u00edcico, dado que los peces\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">dominaban los mares al mismo tiempo que la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">vida se abr\u00eda camino en tierra firme. Se han\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">planteado m\u00faltiples hip\u00f3tesis para explicar\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">esta extinci\u00f3n masiva, que van desde las\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">glaciaciones hasta grandes erupciones vol<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">c\u00e1nicas. Con independencia de su causa, la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">extinci\u00f3n del Dev\u00f3nico extermin\u00f3 al 82% de\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">las especies vivientes en el momento, afec<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">tando principalmente a la vida marina, pro<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">duciendo un colapso casi total de las comu<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">nidades asociadas a los arrecifes\u00a0 coralinos.<\/span><\/p><p style=\"text-align: center\"><strong><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\"><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2.png\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-34519\" src=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2.png\" alt=\"\" width=\"1180\" height=\"746\" srcset=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2.png 1180w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-300x190.png 300w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-1024x647.png 1024w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-768x486.png 768w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-375x237.png 375w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-750x474.png 750w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-2-1140x721.png 1140w\" sizes=\"(max-width: 1180px) 100vw, 1180px\" \/><\/a><\/span><\/strong><\/p><blockquote><p style=\"text-align: center\"><strong><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00abRealmente la vida estuvo<br \/>al borde de retroceder a una<br \/>existencia microsc\u00f3pica\u00bb.<\/span><\/strong><\/p><\/blockquote><p>La extinci\u00f3n de finales del Periodo P\u00e9rmico, tambi\u00e9n conocida como extinci\u00f3n P\u00e9rmico-Tri\u00e1sica tuvo lugar hace unos 250 millones\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de a\u00f1os y marc\u00f3 el final de la Era Primaria o\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Paleozoico. \u00c9sta ha sido la m\u00e1s importante de\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">las 5 grandes extinciones, dado que el 96%\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de las especies y aproximadamente el 50% de\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">las familias desaparecieron. Muchos grupos\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que hab\u00edan tenido \u00e9xito evolutivo como los tri<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">lobites no superaron esta extinci\u00f3n. Su causa\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">es incierta, si bien se especula con el impac<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">to de un meteorito y erupciones volc\u00e1nicas\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">generalizadas. Con independencia del moti<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">vo, la extinci\u00f3n p\u00e9rmica tuvo consecuencias\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">dram\u00e1ticas para la biota que cambi\u00f3 radical<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">mente. Realmente la vida estuvo al borde de\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">retroceder a una existencia microsc\u00f3pica, no\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">recuper\u00e1ndose la biodiversidad hasta bien\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">entrado el Periodo Tri\u00e1sico. No obstante, la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">fauna de este periodo proporcion\u00f3 la base\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">a partir de la cual se desarroll\u00f3 la fauna del\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Mesozoico o Era Secundaria, que supuso un\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">resurgir reforzado, pues los nuevos animales\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">eran m\u00e1s \u00e1giles y fuertes. De todas formas,\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00e9sta no dur\u00f3 mucho debido a que sobrevino\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">la cuarta extinci\u00f3n masiva. La extinci\u00f3n del\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Tri\u00e1sico tuvo lugar hace 201 millones de a\u00f1os\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">y afect\u00f3 al 80% de las especies, sin que tam<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">poco hayan quedado claramente estableci<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">das sus causas. Algunos grupos dominantes\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de reptiles, los \u00faltimos grandes anfibios y los\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Ter\u00e1psidos (tambi\u00e9n conocidos como repti<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">les mamiferoides) se vieron especialmente\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">afectados, por lo que esta extinci\u00f3n supuso la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">consolidaci\u00f3n de los dinosaurios como grupo\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">dominante ya en el Periodo Jur\u00e1sico.<\/span><\/p><p><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00a0<\/span><\/p><p><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3.png\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-34523\" src=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3.png\" alt=\"\" width=\"1076\" height=\"858\" srcset=\"https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3.png 1076w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3-300x239.png 300w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3-1024x817.png 1024w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3-768x612.png 768w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3-375x299.png 375w, https:\/\/www.ull.es\/portal\/hipotesis\/wp-content\/uploads\/sites\/62\/2024\/07\/La-importancia-de-las-extinciones-masivas-3-750x598.png 750w\" sizes=\"(max-width: 1076px) 100vw, 1076px\" \/><\/a><\/p><blockquote><p style=\"text-align: center\"><strong>\u00abRealmente la vida estuvo<\/strong><br \/><strong>al borde de retroceder a una<\/strong><br \/><strong>existencia microsc\u00f3pica\u00bb.<\/strong><\/p><\/blockquote><p>L<\/p><p>a mejor conocida extinci\u00f3n del Cret\u00e1cico Superior tuvo lugar hace 66 millones de\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">a\u00f1os y es sin duda la m\u00e1s famosa por la des<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">aparici\u00f3n de los dinosaurios. Como causa se\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">acepta el impacto de un meteorito de grandes\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">dimensiones, estando esta explicaci\u00f3n ava<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">lada por la presencia de iridio (un elemento\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">qu\u00edmico escaso en la corteza terrestre) en\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">una capa de sedimento que marca el final del\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Mesozoico. Al igual que sucedi\u00f3 en las extin<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">ciones masivas anteriores, muchos grupos\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que hab\u00edan tenido gran \u00e9xito fueron casi o\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">totalmente exterminados para dejar paso, en\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">este caso a los mam\u00edferos que hasta enton<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">ces no hab\u00edan tenido opci\u00f3n alguna en una Era\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">dominada por los grandes reptiles. Entre los\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">supervivientes tambi\u00e9n estaban las aves, gru<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">po que surgi\u00f3 en el Periodo Jur\u00e1sico a partir\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de los celurosaurios (un grupo de dinosaurios\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">Ter\u00e1psidos).<\/span><\/p><p>Los cinco episodios de extinci\u00f3n masiva\u00a0<span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que ha experimentado la vida en nuestro pla<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">neta en los \u00faltimos 542 millones de a\u00f1os han\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">supuesto, en mayor o menor medida, el r\u00e1pido\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">y abrupto exterminio de muchos grupos de\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00e9xito, tras el cual ha tenido lugar la diversifica<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">ci\u00f3n de los supervivientes que han dado lugar\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">a faunas y floras diferentes a las que las pre<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">cedieron. Los r\u00e1pidos y cada vez m\u00e1s eviden<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">tes cambios ambientales que est\u00e1 sufriendo\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">nuestro planeta debido a la actividad humana\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">han llevado a hablar de una posible sexta gran\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">extinci\u00f3n o extinci\u00f3n masiva del Holoceno\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">(\u00c9poca actual del Periodo Cuaternario) en la\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que nuestra especie podr\u00eda engrosar la lista\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">de especies f\u00f3siles, tal como hemos visto que\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">ha sucedido con muchos otros seres vivos\u00a0<\/span><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">que en el pasado dominaron el planeta.<\/span><\/p><p><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif\">\u00a0<\/span><\/p><p><span style=\"font-family: ArgentumSans, sans-serif\">REDACCI\u00d3N <b>ARIANNA BRITO, RICARDO FERN\u00c1NDEZ<\/b><\/span><\/p><p><span style=\"font-family: ArgentumSans, sans-serif\">ILUSTRACI\u00d3N<\/span>\u00a0<strong style=\"font-family: ArgentumSans, sans-serif\">HIP\u00d3TESIS<\/strong><\/p><hr style=\"margin-top: 27px;margin-bottom: 27px;color: #3d3d3d;font-family: ArgentumSans, sans-serif;background-color: #ffffff\" \/><p style=\"font-family: ArgentumSans, sans-serif\"><strong><span style=\"color: #2c284d\">Archivado en<\/span>: <\/strong><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/revista-hipotesis\/\" target=\"_blank\" rel=\"noopener\">Revista Hip\u00f3tesis<\/a><br \/><strong><span style=\"color: #2c284d\">Etiquetas: <\/span><\/strong><span style=\"color: #2c284d\"><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/numero-16\/\" target=\"_blank\" rel=\"noopener\">N\u00famero 16<\/a>, <a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/secci\u00f3n\" target=\"_blank\" rel=\"noopener\">Secci\u00f3n<\/a>, <span data-sheets-root=\"1\"><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/?tag=general\" target=\"_blank\" rel=\"noopener\" target=\"_blank\" rel=\"noopener\">General<\/a><\/span>, <span data-sheets-root=\"1\"><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/proyecto-educativo-hipotesis\" target=\"_blank\" rel=\"noopener\" target=\"_blank\" rel=\"noopener\">Proyecto Educativo Hip\u00f3tesis<\/a><\/span><a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/carlos-alvarez\" target=\"_blank\" rel=\"noopener\">,<\/a> <a href=\"https:\/\/www.ull.es\/portal\/hipotesis\/revista-hipotesis\" target=\"_blank\" rel=\"noopener\">Revista Hip\u00f3tesis<\/a><\/span><\/p><p style=\"font-family: ArgentumSans, sans-serif\">\u00a0<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-129ffdf\" data-id=\"129ffdf\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-afe9c30 elementor-widget elementor-widget-text-editor\" data-id=\"afe9c30\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 class=\"widgettitle\" style=\"color: #5c068c;margin-top: 0px;margin-bottom: 13.5px;font-size: 22px;clear: left;text-transform: uppercase;position: relative;padding-bottom: 20px;text-align: left\"><span style=\"color: #1b2f54\">REPORTAJES RECIENTES<\/span><\/h2><ul><li><a href=\"https:\/\/www.ull.es\/portal\/cienciaull\/africa-y-canarias-una-alianza-para-la-investigacion-y-el-desarrollo\/\" target=\"_blank\" rel=\"noopener\">\u00c1frica y Canarias: una alianza para la investigaci\u00f3n y el desarrollo<\/a><\/li><li><a href=\"https:\/\/www.ull.es\/portal\/cienciaull\/la-abeja-una-aliada-en-peligro\/\" target=\"_blank\" rel=\"noopener\">La abeja, una aliada en peligro<\/a><\/li><li><a href=\"https:\/\/www.ull.es\/portal\/cienciaull\/el-diseno-cambia-nuestras-vidas\/\" target=\"_blank\" rel=\"noopener\">El dise\u00f1o cambia nuestras vidas<\/a><\/li><li><a href=\"https:\/\/www.ull.es\/portal\/cienciaull\/parkinson-mas-alla-de-los-sintomas-motores\/\" target=\"_blank\" rel=\"noopener\">P\u00e1rkinson: m\u00e1s all\u00e1 de los s\u00edntomas motores<\/a><\/li><li><a href=\"https:\/\/www.ull.es\/portal\/cienciaull\/ciencia-para-combatir-la-sequia\/\" target=\"_blank\" rel=\"noopener\">Ciencia para combatir la sequ\u00eda<\/a><\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-82498e7 e-grid-align-left elementor-shape-rounded elementor-grid-0 elementor-widget elementor-widget-social-icons\" data-id=\"82498e7\" data-element_type=\"widget\" data-widget_type=\"social-icons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.9.2 - 21-12-2022 *\/\n.elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) 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