{"id":75561,"date":"2026-05-20T21:43:10","date_gmt":"2026-05-20T21:43:10","guid":{"rendered":"https:\/\/www.europesays.com\/sk\/75561\/"},"modified":"2026-05-20T21:43:10","modified_gmt":"2026-05-20T21:43:10","slug":"preco-mal-t-rex-take-smiesne-male-ruky-vedci-tvrdia-ze-za-tym-nebola-chyba-evolucie-ale-brutalny-sposob-lovu-vosveteit-sk","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/sk\/75561\/","title":{"rendered":"Pre\u010do mal T. rex tak\u00e9 smie\u0161ne mal\u00e9 ruky? Vedci tvrdia, \u017ee za t\u00fdm nebola chyba evol\u00facie, ale brut\u00e1lny sp\u00f4sob lovu | Vosveteit.sk"},"content":{"rendered":"

Ke\u010f si predstav\u00edme T. rexa, ako prv\u00e9 n\u00e1m na rozum \u010dasto pr\u00eddu jeho mal\u00e9 r\u00fa\u010dky, ktor\u00e9 s\u00fa a\u017e komicky kr\u00e1tke v porovnan\u00ed s jeho telom, vedci v\u0161ak hovoria, \u017ee Tyrannosaurus rex a \u010fal\u0161\u00ed m\u00e4so\u017erav\u00ed dinosauri nepri\u0161li o svoje ruky n\u00e1hodou ani kv\u00f4li \u201eevolu\u010dnej chybe\u201c. Nov\u00e1 anal\u00fdza vedcov z University College London a University<\/a> of Cambridge ukazuje, \u017ee za drobn\u00fdmi predn\u00fdmi kon\u010datinami stoj\u00ed mimoriadne \u0161pecifick\u00fd posun v sp\u00f4sobe lovu.<\/p>\n

\u0160t\u00fadia publikovan\u00e1 v \u010dasopise Proceedings of the Royal Society B<\/a> analyzovala 82 druhov terop\u00f3dov a uk\u00e1zala, \u017ee zmen\u0161enie r\u00fak sa opakovalo naprie\u010d viacer\u00fdmi skupinami, nie iba u tyranosaurov. Vedci sledovali p\u00e4\u0165 nez\u00e1visl\u00fdch l\u00edni\u00ed, kde sa ruky zmen\u0161ili podobn\u00fdm sp\u00f4sobom, hoci tieto skupiny sa vyv\u00edjali oddelene.<\/p>\n

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K\u013e\u00fa\u010dov\u00fd sp\u00fa\u0161\u0165a\u010d tohto v\u00fdvoja nebol n\u00e1hoda ani evolu\u010dn\u00fd vrtoch, ale ve\u013ekos\u0165 koristi. V obdob\u00ed jury a kriedy za\u010dali dominova\u0165 obrovsk\u00e9 sauropody, bylino\u017eravce dlh\u00e9 aj vy\u0161e 30 metrov. A pr\u00e1ve tu sa zmenil sp\u00f4sob lovu najv\u00e4\u010d\u0161\u00edch pred\u00e1torov<\/a>. Predstava, \u017ee by T. rex alebo Carnotaurus pou\u017e\u00edvali predn\u00e9 kon\u010datiny na \u00fatok na tak\u00fato masu, prest\u00e1va d\u00e1va\u0165 zmysel u\u017e pri z\u00e1kladnej biomechanike. Tak\u00fd kontakt by znamenal riziko zlomen\u00edn a zranen\u00ed bez re\u00e1lneho efektu. Ove\u013ea efekt\u00edvnej\u0161ou sa stala siln\u00e1 lebka, mas\u00edvne \u010de\u013euste a \u00fachop cel\u00fdm telom.<\/p>\n

\"archosaur\"archosaurZdroj: Michael Rosskothen \/ Shutterstock.com<\/p>\n

\u201eVe\u013ek\u00e1 koris\u0165 posunula pred\u00e1torov od paz\u00farov k \u010de\u013eustiam,\u201c uviedol jeden z autorov v\u00fdskumu.<\/p>\n

Scvrknutie r\u00fak prebehlo u viacer\u00fdch druhov, no zaka\u017ed\u00fdm inak<\/p>\n

\u0160t\u00fadia z\u00e1rove\u0148 uk\u00e1zala jeden d\u00f4le\u017eit\u00fd detail: zmen\u0161enie r\u00fak neprebehlo v\u0161ade rovnako. Niektor\u00e9 l\u00ednie skr\u00e1tili hlavne prsty a predlaktie, in\u00e9 zmen\u0161ili cel\u00fa kon\u010datinu rovnomerne. V\u00fdsledok v\u0161ak zostal rovnak\u00fd, ruky stratili funk\u010dn\u00fd v\u00fdznam.<\/p>\n

\u201eRovnak\u00fd v\u00fdsledok vznikol r\u00f4znymi v\u00fdvojov\u00fdmi cestami, \u010do naz\u00fdvame konvergentn\u00e1 evol\u00facia,\u201c uviedli autori \u0161t\u00fadie.<\/p>\n

T\u00fdm sa rozb\u00edja jednoduch\u00e1 predstava jednej univerz\u00e1lnej evolu\u010dnej trajekt\u00f3rie. Autori v\u00fdskumu hovoria, \u017ee ide sk\u00f4r o s\u00e9riu paraleln\u00fdch rie\u0161en\u00ed rovnak\u00e9ho probl\u00e9mu.<\/p>\n

Neprehliadni
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\"notebook\"notebook <\/p>\n

\n\t\t\t\t\tPred k\u00fapou notebooku si skontroluj, \u010di m\u00e1 tieto v\u0161etky porty. Inak to m\u00f4\u017ee\u0161 nesk\u00f4r o\u013eutova\u0165 <\/p>\n

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Ak\u00e9 druhy okrem Tyrannosaura pri\u0161li o svoje predn\u00e9 kon\u010datiny?<\/p>\n

Aby sa tento trend nezdialil len do abstraktnej roviny, vedci pouk\u00e1zali na konkr\u00e9tne druhy, ktor\u00e9 ho ilustruj\u00fa najlep\u0161ie. Tyrannosaurus rex<\/a> sa stal extr\u00e9mom v sile lebky. Jeho hlava dosahovala tak\u00fa robustnos\u0165, \u017ee dok\u00e1zala absorbova\u0165 obrovsk\u00e9 tlaky pri hryzen\u00ed kost\u00ed. V kombin\u00e1cii so siln\u00fdm zhryzom vznikol jeden z najefekt\u00edvnej\u0161\u00edch loveck\u00fdch syst\u00e9mov svojej doby.<\/p>\n

E\u0161te extr\u00e9mnej\u0161\u00ed kontrast pon\u00faka Carnotaurus. Tento juhoamerick\u00fd pred\u00e1tor mal predn\u00e9 kon\u010datiny tak mal\u00e9, \u017ee sa stali takmer symbolick\u00fdm zvy\u0161kom evol\u00facie. Posledn\u00fdm pr\u00edkladom je\u00a0Majungasaurus, ktor\u00fd \u017eil na Madagaskare pribli\u017ene pred 70 mili\u00f3nmi rokov. Tento pred\u00e1tor v\u00e1\u017eil len okolo 1,6 tony, no aj napriek tomu mal extr\u00e9mne siln\u00fa a kompaktn\u00fa lebku spolu s v\u00fdrazne redukovan\u00fdmi rukami. Ukazuje to, \u017ee zmen\u0161enie kon\u010dat\u00edn nez\u00e1viselo priamo od ve\u013ekosti tela.<\/p>\n

Lebka sa stala dominantn\u00fdm loveck\u00fdm n\u00e1strojom<\/p>\n

V\u00fdskumn\u00edci pritom zaviedli aj detailnej\u0161ie meranie robustnosti lebky. Hodnotili pevnos\u0165 kost\u00ed, tvar lebky a silu uhryznutia. Kompaktnej\u0161ie lebky dosahovali vy\u0161\u0161iu odolnos\u0165 a lep\u0161ie pren\u00e1\u0161ali tlak pri \u00fatoku. Tento trend sa objavil vo v\u0161etk\u00fdch skupin\u00e1ch s mal\u00fdmi rukami.<\/p>\n

\"Tyrannosaurus\"TyrannosaurusZdroj: unsplash.com (Fausto Garc\u00eda-Men\u00e9ndez)<\/p>\n

\u201eNevid\u00edme jednoduch\u00fd vz\u0165ah medzi ve\u013ekos\u0165ou tela a rukami,\u201c uviedli vedci. \u201eD\u00f4le\u017eitej\u0161ia bola funkcia lebky.\u201c<\/p>\n

V\u00fdsledok tak ukazuje, \u017ee ruky sa nezmen\u0161ovali len tak, alebo v s\u00favislosti od ve\u013ekosti tela dinosaurov. Zmen\u0161ovanie r\u00fak v tomto smere predstavovalo reakcu na to, \u017ee \u010de\u013eus\u0165 a lebka<\/a> sa st\u00e1vali \u010doraz efekt\u00edvnej\u0161\u00edm n\u00e1strojom lovu.<\/p>\n

Objav n\u00e1m ukazuje, ak\u00fdmi r\u00f4znymi smermi sa m\u00f4\u017ee evol\u00facia vybra\u0165. Ako sme spomenuli, r\u00f4zne skupiny terop\u00f3dov v tej dobe rie\u0161ili rovnak\u00fd probl\u00e9m, ako ulovi\u0165 ve\u013ek\u00fa koris\u0165, ka\u017ed\u00e1 skupina to v\u0161ak vyrie\u0161ila trochu in\u00fdm sp\u00f4sobom. Vo v\u00fdsledku v\u0161ak m\u00f4\u017eeme pozorova\u0165 rovnak\u00e9 zakrpatenie r\u00fak u viacer\u00fdch vrcholov\u00fdch pred\u00e1torov svojej doby, hoci sa biomechanick\u00e9 sp\u00f4soby m\u00f4\u017eu l\u00ed\u0161i\u0165.<\/p>\n


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