{"id":2788,"date":"2021-01-21T20:31:51","date_gmt":"2021-01-21T20:31:51","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=2788"},"modified":"2021-01-21T20:31:51","modified_gmt":"2021-01-21T20:31:51","slug":"dinosaur-extinction-egg-eating-predators","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/cs\/science\/paleontology\/dinosaur-extinction-egg-eating-predators\/","title":{"rendered":"Z\u00e1hada vym\u00edr\u00e1n\u00ed dinosaur\u016f: Mohli za n\u011bj pred\u00e1to\u0159i poj\u00eddaj\u00edc\u00ed vejce?"},"content":{"rendered":"

Vym\u00edr\u00e1n\u00ed dinosaur\u016f: Z\u00e1nik obr\u016f<\/h2>\n\n

Z\u00e1hada vym\u00edr\u00e1n\u00ed dinosaur\u016f<\/h2>\n\n

Vym\u00edr\u00e1n\u00ed dinosaur\u016f po stalet\u00ed m\u00e1tlo v\u011bdce. V roce 1925 navrhl paleontolog George Wieland novou hypot\u00e9zu: \u017ee pred\u00e1to\u0159i poj\u00eddaj\u00edc\u00ed vejce sehr\u00e1li v\u00fdznamnou roli v \u00fapadku t\u011bchto vzne\u0161en\u00fdch tvor\u016f.<\/p>\n\n

Pred\u00e1to\u0159i poj\u00eddaj\u00edc\u00ed vejce: Hrozba pro p\u0159e\u017eit\u00ed dinosaur\u016f<\/h2>\n\n

Wieland v\u011b\u0159il, \u017ee hlavn\u00edmi vin\u00edky za vym\u00edr\u00e1n\u00ed dinosaur\u016f byly je\u0161t\u011brky a hadi poj\u00eddaj\u00edc\u00ed vejce. Tvrdil, \u017ee tito pred\u00e1to\u0159i mohli spolknout vejce dinosaur\u016f cel\u00e1 a p\u0159ipravit tak dinosaury o jejich budouc\u00ed generace. Tuto hypot\u00e9zu podpo\u0159il objev fosiln\u00edch d\u016fkaz\u016f, jako je k\u0159\u00eddov\u00fd had Sanajeh, o kter\u00e9m se p\u0159edpokl\u00e1d\u00e1, \u017ee se \u017eivil vejci sauropod\u016f.<\/p>\n\n

Evoluce poj\u00edda\u010d\u016f vajec<\/h2>\n\n

Wieland tak\u00e9 navrhl, \u017ee strava slo\u017een\u00e1 z vajec mohla v\u00e9st k evoluci n\u011bkter\u00fdch z nejv\u011bt\u0161\u00edch drav\u00fdch dinosaur\u016f, jako je Tyrannosaurus. Obrovsk\u00e1 velikost t\u011bchto pred\u00e1tor\u016f mohla b\u00fdt adaptac\u00ed na jejich zvyk poj\u00eddat vejce. Wieland nav\u00edc spekuloval, \u017ee dinosau\u0159i poj\u00eddaj\u00edc\u00ed vejce mohli v koordinovan\u00fdch skupin\u00e1ch vyhled\u00e1vat nechr\u00e1n\u011bn\u00e1 hn\u00edzda.<\/p>\n\n

Obrany a protiopat\u0159en\u00ed<\/h2>\n\n

Dinosau\u0159i nebyli proti pred\u00e1tor\u016fm vajec zcela bezbrann\u00ed. Wieland v\u011b\u0159il, \u017ee mo\u017en\u00e1 poskytovali rodi\u010dovskou p\u00e9\u010di, byli aktivn\u011bj\u0161\u00ed ne\u017e dne\u0161n\u00ed je\u0161t\u011brky a krokod\u00fdli a dokonce vytv\u00e1\u0159eli koordinovan\u00e9 skupiny, aby chr\u00e1nili sv\u00e1 hn\u00edzda. Tato obrana v\u0161ak nakonec nesta\u010dila k tomu, aby zabr\u00e1nila \u00fapadku dinosaur\u016f.<\/p>\n\n

Ekologick\u00e9 faktory a vym\u00edr\u00e1n\u00ed<\/h2>\n\n

Wieland uznal, \u017ee krom\u011b predace vajec p\u0159isp\u011bly k vym\u00edr\u00e1n\u00ed dinosaur\u016f tak\u00e9 ekologick\u00e9 faktory. V\u011b\u0159il, \u017ee neschopnost dinosaur\u016f p\u0159izp\u016fsobit se m\u011bn\u00edc\u00edm se podm\u00ednk\u00e1m prost\u0159ed\u00ed a jejich \u201erasov\u00e1 senilita\u201c zpe\u010detily jejich osud.<\/p>\n\n

Ned\u00e1vn\u00e9 objevy a revidovan\u00e9 ch\u00e1p\u00e1n\u00ed<\/h2>\n\n

Od Wielandovy doby objevili paleontologov\u00e9 dal\u0161\u00ed fosiln\u00ed d\u016fkazy o predaci vajec na dinosaurech. Nen\u00ed v\u0161ak \u017e\u00e1dn\u00fd n\u00e1znak, \u017ee by pouze poj\u00edda\u010di vajec zp\u016fsobili vym\u00edr\u00e1n\u00ed dinosaur\u016f. Na\u0161e ch\u00e1p\u00e1n\u00ed ud\u00e1losti vym\u00edr\u00e1n\u00ed k\u0159\u00eddy-paleog\u00e9nu, kter\u00e1 vyhladila dinosaury a mnoho dal\u0161\u00edch druh\u016f, bylo tak\u00e9 revidov\u00e1no. Dnes se p\u0159edpokl\u00e1d\u00e1, \u017ee ji zp\u016fsobila kombinace faktor\u016f, v\u010detn\u011b dopad\u016f asteroid\u016f a sope\u010dn\u00fdch erupc\u00ed.<\/p>\n\n

Vejce dinosaur\u016f: Cenn\u00fd zdroj<\/h2>\n\n

Zat\u00edmco predace vajec pravd\u011bpodobn\u011b nevedla k vym\u00edr\u00e1n\u00ed dinosaur\u016f, vejce dinosaur\u016f byla nepochybn\u011b cenn\u00fdm zdrojem vyu\u017e\u00edvan\u00fdm maso\u017eravci a v\u0161e\u017eravci. Tato vejce poskytovala v\u00fd\u017eivnou potravu pro r\u016fzn\u00e9 pred\u00e1tory a utv\u00e1\u0159ela ekologickou dynamiku mesozoick\u00e9 \u00e9ry.<\/p>\n\n

D\u011bdictv\u00ed Wielandovy hypot\u00e9zy<\/h2>\n\n

Wielandova hypot\u00e9za o vym\u00edr\u00e1n\u00ed dinosaur\u016f, kter\u00e1 nakonec nebyla pln\u011b podpo\u0159ena d\u016fkazy, vyvolala d\u016fle\u017eit\u00fd v\u011bdeck\u00fd v\u00fdzkum. Zd\u016fraznila potenci\u00e1ln\u00ed roli predace vajec v \u00fapadku dinosaur\u016f a zd\u016fraznila slo\u017eit\u00e9 interakce mezi pred\u00e1tory a ko\u0159ist\u00ed v prehistorick\u00fdch ekosyst\u00e9mech.<\/p>\n\n

Prob\u00edhaj\u00edc\u00ed v\u00fdzkum<\/h2>\n\n

V\u00fdzkum role pred\u00e1tor\u016f vajec v evoluci a vym\u00edr\u00e1n\u00ed dinosaur\u016f pokra\u010duje dodnes. V\u011bdci zkoumaj\u00ed potravn\u00ed n\u00e1vyky pred\u00e1tor\u016f poj\u00eddaj\u00edc\u00edch vejce, dopad predace vajec na populace dinosaur\u016f a evolu\u010dn\u00ed d\u016fsledky poj\u00edd\u00e1n\u00ed vajec u dinosaur\u016f. Tento prob\u00edhaj\u00edc\u00ed v\u00fdzkum m\u00e1 za c\u00edl vrhnout dal\u0161\u00ed sv\u011btlo na slo\u017eit\u00e9 faktory, kter\u00e9 vedly k z\u00e1niku dinosaur\u016f.<\/p>","protected":false},"excerpt":{"rendered":"

Vym\u00edr\u00e1n\u00ed dinosaur\u016f: Z\u00e1nik obr\u016f Z\u00e1hada vym\u00edr\u00e1n\u00ed dinosaur\u016f Vym\u00edr\u00e1n\u00ed dinosaur\u016f po stalet\u00ed m\u00e1tlo v\u011bdce. V roce 1925 navrhl paleontolog George Wieland novou hypot\u00e9zu: \u017ee pred\u00e1to\u0159i poj\u00eddaj\u00edc\u00ed vejce sehr\u00e1li v\u00fdznamnou roli v…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[219,136,5514,137,5524,5122],"class_list":["post-2788","post","type-post","status-publish","format-standard","hentry","category-paleontology","tag-ecology","tag-evolution","tag-cretaceous-period","tag-paleontology","tag-egg-eating-predators","tag-dinosaur-extinction"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2788","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\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=2788"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2788\/revisions"}],"predecessor-version":[{"id":2789,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2788\/revisions\/2789"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=2788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=2788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=2788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}