P\u0159edstavte si dinosaury, kte\u0159\u00ed se potuluj\u00ed nejen v tropick\u00fdch les\u00edch a ba\u017ein\u00e1ch, ale tak\u00e9 v mraziv\u00fdch severn\u00edch \u0161\u00ed\u0159k\u00e1ch. P\u0159esn\u011b to odhaluje nov\u00e1 studie publikovan\u00e1 v \u010dasopise Naturwissenschaften<\/em> \u2013 dinosau\u0159i vzkv\u00e9tali v Arktick\u00e9m kruhu a\u017e do sv\u00e9 vyhynut\u00ed p\u0159ed 65\u202fmili\u00f3ny let.<\/p>\n\n D\u0159\u00edve se v\u011bdci soust\u0159edili na pol\u00e1rn\u00ed dinosaury v Alja\u0161ce a na ji\u017en\u00edm p\u00f3lu. Nyn\u00ed paleontologov\u00e9 odhalili fosiln\u00ed soubor v oblasti Kakanaut na severov\u00fdchod\u011b Ruska, datovan\u00fd na samotn\u00fd konec k\u0159\u00eddy. Toto m\u00edsto, nach\u00e1zej\u00edc\u00ed se v Arktick\u00e9m kruhu, bylo tehdy tak chladn\u00e9, \u017ee postr\u00e1dalo mal\u00e9 plazy a oboj\u017eiveln\u00edky.<\/p>\n\n Navzdory drsn\u00fdm podm\u00ednk\u00e1m dinosau\u0159i nejen p\u0159e\u017eili v tomto mraziv\u00e9m prost\u0159ed\u00ed, ale zd\u00e1 se, \u017ee zde i vzkv\u00e9tali. Pat\u0159ili sem b\u00fdlo\u017eravci i maso\u017eravci r\u016fzn\u00fdch velikost\u00ed, jako byli hadrosau\u0159i, rohat\u00ed dinosau\u0159i, ankylosau\u0159i, tyranosau\u0159i i dromeosau\u0159i. Tento objev stav\u00ed pod ot\u00e1zku p\u0159edstavu, \u017ee dinosau\u0159i byli studenokrevn\u00ed tvorov\u00e9.<\/p>\n\n Nejv\u00edce p\u0159ekvapiv\u00fdm n\u00e1lezem v Kakanautu byly fragmenty dinosau\u0159\u00ed sko\u0159\u00e1pky vaj\u00ed\u010dek. To nazna\u010duje, \u017ee alespo\u0148 n\u011bkte\u0159\u00ed dinosau\u0159i se v tomto habitatu rozmno\u017eovali, co\u017e nazna\u010duje jejich del\u0161\u00ed pobyt. N\u011bkte\u0159\u00ed mohli dokonce z\u016fstat po cel\u00fd rok, zejm\u00e9na pokud jejich ml\u00e1\u010fata vy\u017eadovala p\u00e9\u010di rodi\u010d\u016f.<\/p>\n\n P\u0159\u00edtomnost rozmanit\u00fdch dinosaur\u016f v Arktick\u00e9m kruhu na konci k\u0159\u00eddy m\u00e1 dopad na pochopen\u00ed jejich vyhynut\u00ed. Pokud byli dinosau\u0159i tak p\u0159izp\u016fsobiv\u00ed, je nepravd\u011bpodobn\u00e9, \u017ee jejich glob\u00e1ln\u00ed vyhynut\u00ed bylo postupn\u00e9.<\/p>\n\n Na druhou stranu se navrhuje, \u017ee dopad meteoru mohl zp\u016fsobit ochlazen\u00ed glob\u00e1ln\u00edho klimatu, co\u017e nakonec dinosaury zabilo. Existence tolika pol\u00e1rn\u00edch dinosaur\u016f v\u0161ak ukazuje, \u017ee n\u011bkter\u00e9 druhy dok\u00e1zaly v chladn\u00fdch oblastech prosperovat. Proto samotn\u00e9 ochlazen\u00ed teplot nen\u00ed schopno pln\u011b vysv\u011btlit jejich zmizen\u00ed.<\/p>\n\n Vyhynut\u00ed dinosaur\u016f z\u016fst\u00e1v\u00e1 jednou z nejzaj\u00edmav\u011bj\u0161\u00edch v\u011bdeck\u00fdch z\u00e1had. Lokalita Kakanaut poskytuje cenn\u00e9 stopy, ale z\u00e1rove\u0148 vyvol\u00e1v\u00e1 nov\u00e9 ot\u00e1zky. Dal\u0161\u00ed v\u00fdzkum je nezbytn\u00fd k rozpl\u00e9t\u00e1n\u00ed slo\u017eit\u00fdch faktor\u016f, kter\u00e9 vedly ke z\u00e1niku t\u011bchto prad\u00e1vn\u00fdch tvor\u016f.<\/p>\n\n Nalezen\u00ed dinosau\u0159\u00ed sko\u0159\u00e1pky vaj\u00ed\u010dek v Kakanautu nazna\u010duje, \u017ee alespo\u0148 n\u011bkte\u0159\u00ed dinosau\u0159i \u017eili v Arktick\u00e9m kruhu po cel\u00fd rok. Je v\u0161ak tak\u00e9 mo\u017en\u00e9, \u017ee jin\u00ed migrovali do tohoto regionu sez\u00f3nn\u011b. Pot\u0159ebujeme v\u00edce d\u016fkaz\u016f, abychom ur\u010dili rozsah migra\u010dn\u00edch vzorc\u016f dinosaur\u016f v pol\u00e1rn\u00edch oblastech.<\/p>\n\n Zat\u00edmco ochlazov\u00e1n\u00ed teplot pravd\u011bpodobn\u011b nebylo jedinou p\u0159\u00ed\u010dinou vyhynut\u00ed dinosaur\u016f, hr\u00e1lo pravd\u011bpodobn\u011b roli. Lokalita Kakanaut ukazuje, \u017ee n\u011bkte\u0159\u00ed dinosau\u0159i dok\u00e1zali p\u0159izp\u016fsobit se chladn\u00fdm podm\u00ednk\u00e1m. P\u0159esto dopad glob\u00e1ln\u00edho ochlazovac\u00edho jevu na populace dinosaur\u016f po cel\u00e9m sv\u011bt\u011b z\u016fst\u00e1v\u00e1 p\u0159edm\u011btem pokra\u010duj\u00edc\u00edho v\u00fdzkumu.<\/p>\n\n Teorie, \u017ee dopad meteoritu zp\u016fsobil vyhynut\u00ed dinosaur\u016f, je st\u00e1le p\u0159edm\u011btem debat. Existence pol\u00e1rn\u00edch dinosaur\u016f vyvol\u00e1v\u00e1 ot\u00e1zky ohledn\u011b dopadu na r\u016fzn\u00e9 druhy dinosaur\u016f. Dal\u0161\u00ed vy\u0161et\u0159ov\u00e1n\u00ed je nutn\u00e9 k ur\u010den\u00ed p\u0159esn\u00e9ho vztahu mezi dopadem meteoritu a vyhynut\u00edm t\u011bchto prad\u00e1vn\u00fdch obrov.<\/p>","protected":false},"excerpt":{"rendered":" Sibi\u0159\u0161t\u00ed dinosau\u0159i: p\u0159e\u017e\u00edv\u00e1n\u00ed v chladu a z\u00e1hada jejich vyhynut\u00ed P\u0159edstavte si dinosaury, kte\u0159\u00ed se potuluj\u00ed nejen v tropick\u00fdch les\u00edch a ba\u017ein\u00e1ch, ale tak\u00e9 v mraziv\u00fdch severn\u00edch \u0161\u00ed\u0159k\u00e1ch. P\u0159esn\u011b to odhaluje…<\/p>\n","protected":false},"author":2,"featured_media":25519,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[5123,5124,5121,5120,5122],"class_list":["post-2540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paleontology","tag-arctic-life","tag-cold-adapted-animals","tag-polar-dinosaurs","tag-siberian-dinosaurs","tag-dinosaur-extinction"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=2540"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2540\/revisions"}],"predecessor-version":[{"id":25520,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2540\/revisions\/25520"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media\/25519"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=2540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=2540"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=2540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Pol\u00e1rn\u00ed dinosau\u0159i: p\u0159ekvapiv\u00fd objev<\/h3>\n\n
P\u0159izp\u016fsoben\u00ed se chladu<\/h3>\n\n
Dinosau\u0159\u00ed sko\u0159\u00e1pka vaj\u00ed\u010dek: d\u016fkaz celoro\u010dn\u00edho pobytu<\/h3>\n\n
D\u016fsledky pro vyhynut\u00ed dinosaur\u016f<\/h3>\n\n
Z\u00e1hada vyhynut\u00ed pokra\u010duje<\/h3>\n\n
P\u0159ist\u011bhov\u00e1vali se pol\u00e1rn\u00ed dinosau\u0159i nebo \u017eili celoro\u010dn\u011b?<\/h3>\n\n
Jak ovlivnily ochlazuj\u00edc\u00ed se teploty vyhynut\u00ed dinosaur\u016f?<\/h3>\n\n
Spojen\u00ed mezi vyhynut\u00edm dinosaur\u016f a dopadem meteoritu<\/h3>\n\n