[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.soremus.cz\/proc-byl-v-minulosti-hmyz-vetsi\/#Article","mainEntityOfPage":"https:\/\/www.soremus.cz\/proc-byl-v-minulosti-hmyz-vetsi\/","headline":"Pro\u010d byl v minulosti hmyz v\u011bt\u0161\u00ed","name":"Pro\u010d byl v minulosti hmyz v\u011bt\u0161\u00ed","description":"N\u011bkter\u00e9 druhy hmyzu pat\u0159\u00ed mezi ty, kter\u00e9 se od d\u00e1vn\u00fdch dob p\u0159\u00edli\u0161 nezm\u011bnily. Typick\u00fdm p\u0159\u00edkladem mohou b\u00fdt v\u00e1\u017eky. Kdy\u017e se pod\u00edv\u00e1me na jejich zkamen\u011bl\u00e9 otisky, […]","datePublished":"2023-08-03","dateModified":"2023-08-03","author":{"@type":"Person","@id":"https:\/\/www.soremus.cz\/author\/#Person","name":"","url":"https:\/\/www.soremus.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/edf965aa5e6319b22667bed24bb070a38fc0326fd1c728db50dc1d860a4a16ad?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/edf965aa5e6319b22667bed24bb070a38fc0326fd1c728db50dc1d860a4a16ad?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"soremus.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.soremus.cz\/wp-content\/uploads\/hmyz4.jpg","url":"https:\/\/www.soremus.cz\/wp-content\/uploads\/hmyz4.jpg","height":0,"width":0},"url":"https:\/\/www.soremus.cz\/proc-byl-v-minulosti-hmyz-vetsi\/","about":["V\u011bda"],"wordCount":414,"articleBody":"N\u011bkter\u00e9 druhy hmyzu pat\u0159\u00ed mezi ty, kter\u00e9 se od d\u00e1vn\u00fdch dob p\u0159\u00edli\u0161 nezm\u011bnily. Typick\u00fdm p\u0159\u00edkladem mohou b\u00fdt v\u00e1\u017eky. Kdy\u017e se pod\u00edv\u00e1me na jejich zkamen\u011bl\u00e9 otisky, zjist\u00edme, \u017ee jsou prakticky stejn\u00e9 jako ty dne\u0161n\u00ed, jen s\u00a0jedn\u00edm podstatn\u00fdm rozd\u00edlem \u2013 tehdy byly mnohem v\u011bt\u0161\u00ed.\u00a0\u00a0Bylo zji\u0161t\u011bno, \u017ee rozp\u011bt\u00ed k\u0159\u00eddel v\u00e1\u017eky bylo tehdy okolo dvou metr\u016f. Dnes je to desetina t\u00e9to d\u00e9lky. A v\u00e1\u017eky nejsou ani zdaleka jedin\u00e9, kter\u00fdch se to t\u00fdk\u00e1. Hmyz v\u00a0druhohor\u00e1ch byl podstatn\u011b v\u011bt\u0161\u00ed ne\u017e ten, kter\u00fd zn\u00e1me dnes.\u00a0Samoz\u0159ejm\u011b by bylo snadn\u00e9 tvrdit, \u017ee musel b\u00fdt tak velk\u00fd kv\u016fli dinosaur\u016fm, kte\u0159\u00ed tehdy tvo\u0159ili dominantn\u00ed \u017eivo\u010di\u0161nou t\u0159\u00eddu na na\u0161\u00ed planet\u011b. Av\u0161ak to bychom se m\u00fdlili. A\u010dkoliv toti\u017e valn\u00e1 v\u011bt\u0161ina z\u00a0n\u00e1s zn\u00e1 jen ty skute\u010dn\u00e9 druhy, pr\u016fm\u011brn\u00fd dinosaurus byl ve skute\u010dnosti jen o n\u011bco v\u011bt\u0161\u00ed ne\u017e dne\u0161n\u00ed vlk, tedy p\u0159ibli\u017en\u011b okolo jednoho metru. Jejich velikost tedy rozhodn\u011b nebyla t\u00edm hlavn\u00edm d\u016fvodem.\u00a0\u00a0D\u00e1le m\u016f\u017eeme mluvit o nadbytku potravy, av\u0161ak ani to nen\u00ed tak docela pravda. Potravu bylo pro \u017eivo\u010dichy v\u010detn\u011b hmyzu stejn\u011b obt\u00ed\u017en\u00e9 sehnat tehdy jako je tomu dnes, a to jak pro pred\u00e1tory, tak i pro b\u00fdlo\u017eravce. Nezd\u00e1 se tedy, \u017ee by to byl rozhoduj\u00edc\u00ed faktor.\u00a0T\u00edm se nakonec uk\u00e1zal b\u00fdt obsah kysl\u00edku. Nesm\u00edme zapom\u00ednat, \u017ee hmyz pat\u0159\u00ed k\u00a0bezobratl\u00fdm, kte\u0159\u00ed nemaj\u00ed vnit\u0159n\u00ed kostru, av\u0161ak jejich\u017e t\u011blo je kryto pevnou kutikulou. K\u00a0jej\u00edmu vytvo\u0159en\u00ed je v\u0161ak pot\u0159eba pom\u011brn\u011b dost kysl\u00edku. Sou\u010dasn\u011b pak tak\u00e9 plat\u00ed, \u017ee hmyz se sv\u00fdm rychl\u00fdm pohybem vzhledem k\u00a0v\u00fd\u0161ce pat\u0159\u00ed mezi energeticky velmi n\u00e1ro\u010dn\u00e9 organismy, op\u011bt s\u00a0velkou spot\u0159ebou kysl\u00edku. Toho bylo tehdy v\u00a0atmosf\u00e9\u0159e okolo 32 % nam\u00edsto dne\u0161n\u00edch 21. To umo\u017enilo pr\u00e1v\u011b bezobratl\u00fdm, aby dos\u00e1hli takov\u00fdch rozm\u011br\u016f.\u00a0Je tedy jasn\u00e9, \u017ee dnes ji\u017e ob\u0159\u00ed hmyz nepotk\u00e1me, zvl\u00e1\u0161t\u011b ne ten l\u00e9taj\u00edc\u00ed, nebo\u0165 i l\u00e9t\u00e1n\u00ed vy\u017eaduje spoustu energie. Sny o ob\u0159\u00edch mravenc\u00edch tedy z\u016fstanou t\u00edm, \u010d\u00edm jsou \u2013 sny. A je pravd\u011bpodobn\u00e9, \u017ee je to dob\u0159e.                                                                                                                                                                                                                                                                                                                                                                                        3.7\/5 - (6 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Pro\u010d byl v minulosti hmyz v\u011bt\u0161\u00ed","item":"https:\/\/www.soremus.cz\/proc-byl-v-minulosti-hmyz-vetsi\/#breadcrumbitem"}]}]