{"id":153235,"date":"2016-10-13T08:18:03","date_gmt":"2016-10-13T06:18:03","guid":{"rendered":"http:\/\/hudo.com\/si\/2016\/10\/13\/spoznajte-zival-ki-lahko-prezivi-celo-brez-zascite-v-vesolju\/"},"modified":"2016-10-28T10:08:56","modified_gmt":"2016-10-28T08:08:56","slug":"spoznajte-zival-ki-lahko-prezivi-celo-brez-zascite-v-vesolju","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/lifestyle\/spoznajte-zival-ki-lahko-prezivi-celo-brez-zascite-v-vesolju\/","title":{"rendered":"Spoznajte \u017eival, ki lahko pre\u017eivi celo brez za\u0161\u010dite v vesolju"},"content":{"rendered":"<figure class=\"wp-caption video\" style=\"padding-top:56.212121212121%\">    \t<div class=\"embed\"><div class=\"embed-notice\">Za ogled vstavljene vsebine morate omogo\u010diti <a href=\"#\" onclick=\"Optanon.ToggleInfoDisplay()\">shranjevanje pi\u0161kotkov v napravi<\/a><\/div><iframe loading=\"lazy\" style=\"position:absolute;top:0;width:100%;height:100%;\" width=\"660\" height=\"371\"  class=\"optanon-category-C0002-C0003-C0004\" optanon-src=\"https:\/\/www.youtube.com\/embed\/7W194GQ6fHI?autohide=1&#038;fs=1&#038;autoplay=0&#038;iv_load_policy=3&#038;rel=0&#038;modestbranding=1&#038;showinfo=0&#038;hd=1\" frameborder=\"0\" allowfullscreen><\/iframe><\/div>    <\/figure>\n<p><a href=\"http:\/\/sl.wikipedia.org\/wiki\/Po%C4%8Dasniki\"><b>Po\u010dasniki<\/b><\/a> ali tardigradi, znani tudi kot medvedki (znanstveno ime Tardigrada), so deblo mikroskopskih, dvobo\u010dno somernih, \u010dlenjenih \u017eivali z osmimi nogami. Znanih je malo ve\u010d kot 1000 vrst,<span style=\"font-size: 11px;\">\u00a0<\/span>ki \u017eivijo po vsem svetu v najrazli\u010dnej\u0161ih okoljih, od vrhov Himalaje do globokomorskih jarkov.<\/p>\n<p>So drobne \u017eivali, ki dose\u017eejo najve\u010d 1,5 mm v dol\u017eino, ime medvedki pa so dobili po premikanju, ki spominja na hojo medveda. Skupina je znana predvsem po tem, da se lahko povsem izsu\u0161ijo in v stanju <a title=\"Kriptobioza\" href=\"http:\/\/sl.wikipedia.org\/wiki\/Kriptobioza\">kriptobioze<\/a> pre\u017eivijo obdobja ekstremnih okoljskih razmer. Kot skupina so dale\u010d najbolj trdo\u017eivi\u00a0med ve\u010dceli\u010dnimi organizmi. Predstavniki razli\u010dnih vrst so dokumentirano pre\u017eiveli 10 dni vakuuma in nefiltriranega\u00a0kozmi\u010dnega sevanja na zunanjosti vesoljske sonde, temperature od ene stopinje nad absolutno ni\u010dlo (-272\u00b0C)\u00a0do 150 \u00baC ter pritisk preko 5000\u00a0atmosfer.<\/p>\n<p>Ve\u010dina vrst je rastlinojedih, redke med njimi pa se prehranjujejo z bakterijami, organskim drobirjem ali plenijo druge majhne talne \u017eivali. Rastlinojedi po\u010dasniki se prehranjujejo tako, da s stiletom prebodejo celi\u010dno steno in z mo\u010dnimi mi\u0161icami v \u017erelu posrkajo vsebino celice.<\/p>\n<p>So vodne \u017eivali, vendar \u017eivijo tako v morskih, kot tudi sladkovodnih in kopenskih habitatih, pri \u010demer prevladujejo kopenske vrste. Tudi kopenske vrste pa zahtevajo vodo za aktivnost in ker so razli\u010dne vrste sposobne pre\u017eiveti v okoljih z razli\u010dno stopnjo vla\u017enosti, je razlo\u010devanje med kopenskimi in sladkovodnimi vrstami nejasno. Najve\u010dkrat jih najedmo pri tleh v vodnem filmu na mahovih. Ker pa so tak\u0161ni habitati zelo spremenljivi, imajo po\u010dasniki razvite razli\u010dne mehanizme kriptobioze &#8211; stanja, v kateri so presnovni procesi upo\u010dasnjeni ali skoraj ustavljeni, kar jim omogo\u010da pre\u017eivetje, ko razmere niso ugodne za aktivnost. (vir: <a href=\"http:\/\/sl.wikipedia.org\/wiki\/Glavna_stran\">Wikipedija<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na na\u0161em planetu \u017eivijo precej nenavadna bitja &#8211; kot je denimo ta simpati\u010dna osemno\u017ena \u017eivalica z imenom po\u010dasnik.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[1686,2023],"source":[1522,1518,1552],"supertag":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Spoznajte \u017eival, ki lahko pre\u017eivi celo brez za\u0161\u010dite v vesolju - Hudo Slovenija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hudo.com\/si\/lifestyle\/spoznajte-zival-ki-lahko-prezivi-celo-brez-zascite-v-vesolju\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spoznajte \u017eival, ki lahko pre\u017eivi celo brez za\u0161\u010dite v vesolju - 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