[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.isis.sk\/predchodcovia-dnesnych-zvierat\/#Article","mainEntityOfPage":"https:\/\/www.isis.sk\/predchodcovia-dnesnych-zvierat\/","headline":"Predchodcovia dne\u0161n\u00fdch zvierat","name":"Predchodcovia dne\u0161n\u00fdch zvierat","description":"Existuje rad te\u00f3ri\u00ed o tom, kedy a ako sa na tejto plan\u00e9te objavili dinosaury. Vedci st\u00e1le b\u00e1daj\u00fa a h\u013eadaj\u00fa preuk\u00e1zate\u013en\u00e9 d\u00f4kazy. A pr\u00e1ve s novou te\u00f3riou o ich vyhynutiu pri\u0161li vedci zo \u0161panielskej Zaragozy. Pod\u013ea paleontologi\u010dky Laiy Alegretovej do\u0161lo pri p\u00e1de asteroidu k r\u00fdchlemu okysleniu povrchov\u00fdch v\u00f4d v oce\u00e1noch. To by vysvetlilo tak ve\u013ek\u00e9 vyhynutie […]","datePublished":"2017-02-28","dateModified":"2023-04-25","author":{"@type":"Person","@id":"https:\/\/www.isis.sk\/author\/#Person","name":"","url":"https:\/\/www.isis.sk\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/bac9badfec1c8ddbfb42cc2a45bdd424bcac2f01b51b95470cbfd0bab9e793fd?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/bac9badfec1c8ddbfb42cc2a45bdd424bcac2f01b51b95470cbfd0bab9e793fd?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"isis.sk","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.isis.sk\/wp-content\/uploads\/img_a280423_w2014_t1493436881.jpg","url":"https:\/\/www.isis.sk\/wp-content\/uploads\/img_a280423_w2014_t1493436881.jpg","height":0,"width":0},"url":"https:\/\/www.isis.sk\/predchodcovia-dnesnych-zvierat\/","about":["Zvierat\u00e1"],"wordCount":533,"articleBody":"Existuje rad te\u00f3ri\u00ed o tom, kedy a ako sa na tejto plan\u00e9te objavili dinosaury. Vedci st\u00e1le b\u00e1daj\u00fa a h\u013eadaj\u00fa preuk\u00e1zate\u013en\u00e9 d\u00f4kazy.A pr\u00e1ve s novou te\u00f3riou o ich vyhynutiu pri\u0161li vedci zo \u0161panielskej Zaragozy. Pod\u013ea paleontologi\u010dky Laiy Alegretovej do\u0161lo pri p\u00e1de asteroidu k r\u00fdchlemu okysleniu povrchov\u00fdch v\u00f4d v oce\u00e1noch. To by vysvetlilo tak ve\u013ek\u00e9 vyhynutie pozemsk\u00fdch druhov, k\u00fdm v\u00a0spodn\u00fdch vod\u00e1ch oce\u00e1nov zvierat\u00e1 pre\u017eili. Dokonca pri\u0161li na to, \u017ee fotosynt\u00e9za v oce\u00e1noch a potravinov\u00fd re\u0165azec sa spam\u00e4tali sk\u00f4r ne\u017e sa predpokladalo.V\u010faka dopade meteoritu vyhynulo a\u017e 70 percent \u017eivo\u010d\u00edchov na tejto plan\u00e9te, najm\u00e4 ve\u013ek\u00fdch morsk\u00fdch ja\u0161terov a primit\u00edvnych hlavono\u017ecov. Napriek tomu st\u00e1le nevieme, pre\u010do v niektor\u00fdch oblastiach, niektor\u00e9 druhy vyhynuli a in\u00e9 nie. Je tomu tak napr\u00edklad pri polostrove Yucat\u00e1n.\tPo\u010das chv\u00edle bolo v\u0161etko pre\u010dSk\u00f4r sa predpokladalo, \u017ee vyhynutie trvalo nieko\u013eko rokov. Do atmosf\u00e9ry sa po dopade meteoritu uvo\u013enilo ve\u013ek\u00e9 mno\u017estvo plynov, \u010do br\u00e1nilo preniknutiu slne\u010dn\u00fdch l\u00fa\u010dov na plan\u00e9tu. V\u010faka tomu nemohlo d\u00f4js\u0165 k fotosynt\u00e9ze. Nov\u00e9 v\u00fdskumy v\u0161ak ukazuj\u00fa, \u017ee miznutie \u017eivo\u010d\u00edchov trvalo ove\u013ea krat\u0161\u00ed \u010das.Pod\u013ea Alegretovej a jej t\u00edmu, nie v\u0161etky organizmy potrebuj\u00fa k \u017eivotu fotosynt\u00e9zu. Preto predpokladaj\u00fa r\u00fdchlej\u0161\u00ed \u00fahyn napr\u00edklad z d\u00f4vodu zakyslenia oce\u00e1nov, ktor\u00e9 mohlo trva\u0165 ve\u013emi kr\u00e1tko a nastalo v\u00fdlu\u010dne v horn\u00fdch vrstv\u00e1ch oce\u00e1nskych v\u00f4d. Pr\u00e1ve to by vysvet\u013eovalo tak r\u00fdchle vymretie po\u010detn\u00fdch organizmov, po\u010dn\u00fac \u017eivo\u010d\u00edchy s uhli\u010dit\u00fdmi schr\u00e1nkami – t\u00ed sa rozpustili. Kyslos\u0165 by sa do spodn\u00fdch vrstiev nedostala.\tVulkanick\u00e1 \u010dinnos\u0165Medzi \u010fal\u0161ie te\u00f3rie o mo\u017enej pr\u00ed\u010dine vyhynut\u00ed dinosaurov patria aj glob\u00e1lne katastrofy, napr\u00edklad rad sope\u010dn\u00fdch erupci\u00ed, ku ktor\u00fdm doch\u00e1dzalo na modrej plan\u00e9te u\u017e mnoho rokov. Vedci vykon\u00e1vaj\u00fa podrobn\u00e9 v\u00fdskumy Dekanskej plo\u0161iny v strednej \u010dasti Indie. Pod\u013ea d\u00f4kazov doch\u00e1dzalo k mohutn\u00fdm erupci\u00e1m pr\u00e1ve v \u010dase, ke\u010f vymreli dinosaury. Erupcie za\u010dali zhruba pred 250 000 rokmi pred vyhynut\u00edm t\u00fdchto ve\u013ek\u00fdch tvorov. Trvali pritom celkom 750 000 rokov.Pod\u013ea geol\u00f3ga Princetonskej univerzity Blaira Shoeneho niet sporu, \u017ee s\u00faviseli s vyhnut\u00edm mnoh\u00fdch druhov. Pod\u013ea neho m\u00f4\u017eu by\u0165 erupcie aj priamou pr\u00ed\u010dinou. Ich vplyvom sa mohla zmeni\u0165 kl\u00edma a potom aj cel\u00fd ekosyst\u00e9m. S\u00e1m ale podot\u00fdka, \u017ee veda m\u00e1 e\u0161te pred sebou dlh\u00fa cestu a poriadny kus pr\u00e1ce na potvrdenie tejto te\u00f3rie.O tom, \u010do sa skuto\u010dne stalo, vedie \u013eudstvo st\u00e1le debaty. Niektor\u00e9 te\u00f3rie s\u00fa podlo\u017een\u00e9 d\u00f4kazmi, in\u00fdm \u00faplne ch\u00fdbaj\u00fa. \u010ci u\u017e je to akoko\u013evek, stoj\u00edme pred ve\u013ek\u00fdm objavom, ku ktor\u00e9mu raz d\u00f4jde a my budeme ma\u0165 presn\u00fa mapu hist\u00f3rie t\u00fdchto b\u00e1jnych tvorov.                                                                                                                                                                                                                                                                                                                                                                                        4.5\/5 - (2 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Predchodcovia dne\u0161n\u00fdch zvierat","item":"https:\/\/www.isis.sk\/predchodcovia-dnesnych-zvierat\/#breadcrumbitem"}]}]