[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.sehi.sk\/krasa-a-nebezpecenstvo-pod-hladinou\/#Article","mainEntityOfPage":"https:\/\/www.sehi.sk\/krasa-a-nebezpecenstvo-pod-hladinou\/","headline":"Kr\u00e1sa a nebezpe\u010denstvo pod hladinou","name":"Kr\u00e1sa a nebezpe\u010denstvo pod hladinou","description":"V h\u013abkach oce\u00e1nov a mor\u00ed \u017eij\u00fa tvory, ktor\u00e9 p\u00f4sobia ako z in\u00e9ho sveta. Med\u00fazy. Ich krehk\u00e9, priesvitn\u00e9 tel\u00e1 tancuj\u00fa v pr\u00fade vody, odr\u00e1\u017eaj\u00face svetlo ako drahokamy pod morskou hladinou. Aj napriek svojej n\u00e1dhere v sebe nes\u00fa aj zna\u010dn\u00e9 riziko. Tieto fascinuj\u00face bytosti, ktor\u00e9 s\u00fa na Zemi u\u017e stovky mili\u00f3nov rokov, […]","datePublished":"2023-08-31","dateModified":"2023-08-31","author":{"@type":"Person","@id":"https:\/\/www.sehi.sk\/author\/#Person","name":"","url":"https:\/\/www.sehi.sk\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/8eaf08ef5a7e54fc91db02b2058b03bc913caaaa39c046819bbf43d06bd23c2b?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8eaf08ef5a7e54fc91db02b2058b03bc913caaaa39c046819bbf43d06bd23c2b?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"sehi.sk","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.sehi.sk\/wp-content\/uploads\/21.jpg","url":"https:\/\/www.sehi.sk\/wp-content\/uploads\/21.jpg","height":0,"width":0},"url":"https:\/\/www.sehi.sk\/krasa-a-nebezpecenstvo-pod-hladinou\/","about":["Zvierat\u00e1"],"wordCount":395,"articleBody":"V h\u013abkach oce\u00e1nov a mor\u00ed \u017eij\u00fa tvory, ktor\u00e9 p\u00f4sobia ako z in\u00e9ho sveta. Med\u00fazy. Ich krehk\u00e9, priesvitn\u00e9 tel\u00e1 tancuj\u00fa v pr\u00fade vody, odr\u00e1\u017eaj\u00face svetlo ako drahokamy pod morskou hladinou. Aj napriek svojej n\u00e1dhere v sebe nes\u00fa aj zna\u010dn\u00e9 riziko. Tieto fascinuj\u00face bytosti, ktor\u00e9 s\u00fa na Zemi u\u017e stovky mili\u00f3nov rokov, maj\u00fa \u010do pon\u00faknu\u0165 nielen vedcom, ale aj be\u017en\u00fdm pozorovate\u013eom pr\u00edrody. Med\u00fazy s\u00fa jedn\u00fdmi z najstar\u0161\u00edch tvorov na na\u0161ej plan\u00e9te. Ich hist\u00f3ria siaha a\u017e 500 mili\u00f3nov rokov dozadu, \u010d\u00edm predbehli aj dinosaury. Tento fakt s\u00e1m o sebe je ohromuj\u00faci a nazna\u010duje ich v\u00fdnimo\u010dn\u00fa schopnos\u0165 prisp\u00f4sobi\u0165 sa meniacim sa podmienkam na Zemi.Ich telo, tvoren\u00e9 z 95% vody, je jednoduch\u00e9, no \u00fa\u010dinn\u00e9. Med\u00fazy nemaj\u00fa mozog, srdce ani kosti, no napriek tomu dok\u00e1\u017eu \u00faspe\u0161ne lovi\u0165 a br\u00e1ni\u0165 sa. Jedn\u00fdm z najzn\u00e1mej\u0161\u00edch aspektov med\u00faz je ich schopnos\u0165 \u0161t\u00edpa\u0165. Tentakuly, ktor\u00e9 visia z ich tela, s\u00fa pokryt\u00e9 \u017eihadlov\u00fdmi bunkami naz\u00fdvan\u00fdmi nematocysty. Tieto bunky obsahuj\u00fa jed, ktor\u00fd med\u00faza pou\u017e\u00edva na omr\u00e1\u010denie svojej koristi, zvy\u010dajne mal\u00fdch r\u00fdb a plankt\u00f3nu. Pre \u013eud\u00ed m\u00f4\u017ee by\u0165 stretnutie s med\u00fazou bolestiv\u00e9 a v niektor\u00fdch pr\u00edpadoch dokonca \u017eivotu nebezpe\u010dn\u00e9. Napr\u00edklad med\u00faza \u010dty\u0159hranka austr\u00e1lska, ktor\u00e1 sa vyskytuje v tepl\u00fdch vod\u00e1ch okolo Austr\u00e1lie, je pova\u017eovan\u00e1 za jednu z najjedovatej\u0161\u00edch morsk\u00fdch tvorov na svete.Napriek tomu v\u0161ak med\u00fazy nie s\u00fa len nebezpe\u010dn\u00e9. S\u00fa tie\u017e d\u00f4le\u017eitou s\u00fa\u010das\u0165ou morsk\u00fdch ekosyst\u00e9mov. Sl\u00fa\u017eia ako potrava pre r\u00f4zne druhy r\u00fdb, morsk\u00fdch korytna\u010diek a vt\u00e1kov. Niektor\u00e9 druhy med\u00faz, ako napr\u00edklad med\u00faza Turritopsis dohrnii, s\u00fa tie\u017e predmetom intenz\u00edvneho vedeck\u00e9ho v\u00fdskumu kv\u00f4li ich schopnosti \u201evr\u00e1ti\u0165 sa\u201c do mladistv\u00e9ho \u0161t\u00e1dia \u017eivota, \u010d\u00edm teoreticky dosahuj\u00fa biologick\u00fa nesmrte\u013enos\u0165. Pre mnoh\u00fdch \u013eud\u00ed s\u00fa med\u00fazy aj zdrojom in\u0161pir\u00e1cie. Ich elegantn\u00fd pohyb a zvl\u00e1\u0161tna kr\u00e1sa boli zachyten\u00e9 v umen\u00ed, literat\u00fare a dokonca aj v m\u00f3dnom dizajne. Ak sa v\u00e1m niekedy podar\u00ed vidie\u0165 med\u00fazu vo vo\u013enej pr\u00edrode, je to z\u00e1\u017eitok, ktor\u00fd sa nezab\u00fada.                                                                                                                                                                                                                                                                                                                                                                                                "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Kr\u00e1sa a nebezpe\u010denstvo pod hladinou","item":"https:\/\/www.sehi.sk\/krasa-a-nebezpecenstvo-pod-hladinou\/#breadcrumbitem"}]}]