{"id":6749,"date":"2015-01-02T12:00:52","date_gmt":"2015-01-02T15:00:52","guid":{"rendered":"http:\/\/patagoniambiental.com.ar\/?p=6749"},"modified":"2015-01-02T12:00:52","modified_gmt":"2015-01-02T15:00:52","slug":"icnologia-tras-las-huellas-de-la-vida","status":"publish","type":"post","link":"https:\/\/patagoniambiental.com.ar\/info\/icnologia-tras-las-huellas-de-la-vida\/","title":{"rendered":"Icnolog\u00eda: tras las huellas de la vida"},"content":{"rendered":"<p style=\"text-align: justify\">Buenos Aires &#8211; Investigadores fueguinos del CONICET estudian las trazas f\u00f3siles dejadas por organismos que habitaron la Tierra hace cientos de millones de a\u00f1os para conocer su comportamiento y el ambiente en ese momento.<!--more--><\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">Durante las vacaciones, la arena de las costas bonaerenses es testimonio del paso de miles de personas que dejan sus huellas dibujadas. Aunque cueste creerlo, existe una disciplina cient\u00edfica que se dedica, justamente, al estudio de estas marcas que quedan conservadas en el sedimento costero y en otros ambientes oce\u00e1nicos y terrestres: la icnolog\u00eda.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">Mediante el an\u00e1lisis de las huellas o \u201ctrazas\u201d, esta disciplina es capaz de conocer el comportamiento de los organismos que las producen y las caracter\u00edsticas del ambiente en el pasado prehist\u00f3rico. Es que, el grupo de investigaci\u00f3n del Laboratorio de Geolog\u00eda Andina del Centro Austral de Investigaciones Cient\u00edficas (CADIC-CONICET) centra sus estudios en los animales que habitaron mares y oc\u00e9anos hace cientos de millones de a\u00f1os.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">En di\u00e1logo con la Agencia CTyS, el doctor en Geolog\u00eda e investigador superior del CONICET, Eduardo Olivero, explica que \u201clas trazas f\u00f3siles tienen la enorme ventaja de dejar en las rocas sedimentarias un registro de organismos que normalmente no dejan registros f\u00f3siles\u201d, puesto que, a diferencia de los dinosaurios u otros invertebrados con caparazones, estos organismos de cuerpo blando carec\u00edan de huesos duros o caparazones y conchillas.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">A fines del Prec\u00e1mbrico, antes del Paleozoico, los mares y oc\u00e9anos estaban dominados por organismos multicelulares variados. Las trazas que dejaron cuando se desplazaban fueron cubiertas por el sedimento. Posteriormente, quedaron preservadas en la roca y permanecieron intactas por millones de a\u00f1os.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">De esta manera, existen trazas que reflejan diferentes comportamientos. Por ejemplo, existieron organismos que ingresaron al sedimento marino para hacer su domicilio, entonces, los registros encontrados fueron llamados \u201ctrazas de domicilio\u201d; otro para buscar alimento que dejaron \u201ctrazas de alimentaci\u00f3n\u201d.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">\u201cLas trazas de domicilio son especies de galer\u00edas o estructuras que alojaban al organismo de cuerpo blando. En tanto, existieron organismos que penetraron en el sedimento para buscar alimento que est\u00e1n adheridos a part\u00edculas como limo o arcilla. All\u00ed, el organismo ingiere esas part\u00edculas sedimentarias que tienen adheridas bacterias y otras sustancias org\u00e1nicas nutritivas y luego las excretan de una manera particular, lo que indica que el organismo estaba comiendo\u201d, resalta Olivero.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">Como dato curioso, existieron organismos que se dedicaron a la agricultura en las profundidades m\u00e1s oscuras del oc\u00e9ano. \u201cHac\u00edan un sistema de galer\u00edas en el interior del sedimento, donde no hay ox\u00edgeno, bombeaban sulfato del agua de mar y adentro hab\u00eda bacterias que degradan ese sulfato. Entonces, cultivaban bacterias para alimentarse\u201d, cuenta el investigador y agrega: \u201cestas trazas particulares de agricultura, permitieron reconocer dep\u00f3sitos marinos profundos del Terciario en Tierra del Fuego, que son \u00fanicos para la Argentina para esta edad\u201d.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">El an\u00e1lisis del comportamiento no es el \u00fanico objeto de estudio de la icnolog\u00eda, sino que adem\u00e1s, su potencial permite conocer c\u00f3mo era el ambiente en el cual viv\u00edan los organismos. \u201cLas trazas de los crust\u00e1ceos son dominantes en ambientes costeros. Entonces, si encontramos trazas de crust\u00e1ceos en rocas sedimentarias del pasado geol\u00f3gico podemos inferir que los sedimentos que alojan estas trazas se depositaron en un ambiente costero\u201d, aclara Isabel L\u00f3pez Cabrera, profesional de CADIC-CONICET, que colabora en las investigaciones.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">De hecho, la icnolog\u00eda es una de las disciplinas paleombientales que logr\u00f3 determinar el l\u00edmite entre la extensa era del Prec\u00e1mbrico, que se inicia hacia los 4.500 millones de a\u00f1os, y la era del Paleozoico, que comienza hacia los 540 millones de a\u00f1os, y que se define sobre la sobre la base de una traza f\u00f3sil. \u201cPorque esa traza f\u00f3sil solo pudo haber sido hecha por un metazoario complejo. Marca una diferencia enorme entre un organismo unicelular, como es la vida dominante en el Prec\u00e1mbrico, y la vida multicelular organizada que es caracter\u00edstica del Paleozoico\u201d, concluye el ge\u00f3logo.<\/p>\n<p style=\"text-align: justify\">\n<p style=\"text-align: justify\">Gaspar Grieco<\/p>\n<p style=\"text-align: justify\">(Agencia CTyS)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Buenos Aires &#8211; Investigadores fueguinos del CONICET estudian las trazas f\u00f3siles dejadas por organismos que habitaron la Tierra hace cientos [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":6750,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[53,1],"tags":[160,2042,2043],"class_list":["post-6749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-noticias","tag-conicet","tag-huellas","tag-icnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Icnolog\u00eda: tras las huellas de la vida<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/patagoniambiental.com.ar\/info\/icnologia-tras-las-huellas-de-la-vida\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" 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