{"id":7670,"date":"2026-04-21T13:41:19","date_gmt":"2026-04-21T10:41:19","guid":{"rendered":"https:\/\/www.schooler.org.ua\/uk-uazlodiyi-z-gnizd-jak-kradizhka-materialiv-ptahami-zagrozhuye\/"},"modified":"2026-04-21T13:41:19","modified_gmt":"2026-04-21T10:41:19","slug":"uk-uazlodiyi-z-gnizd-jak-kradizhka-materialiv-ptahami-zagrozhuye","status":"publish","type":"post","link":"https:\/\/www.schooler.org.ua\/cs\/uk-uazlodiyi-z-gnizd-jak-kradizhka-materialiv-ptahami-zagrozhuye\/","title":{"rendered":"Zlod\u011bji hn\u00edzd: Jak pta\u010d\u00ed kr\u00e1de\u017ee materi\u00e1l\u016f ohro\u017euj\u00ed havajsk\u00e9 lesn\u00ed populace"},"content":{"rendered":"

V bujn\u00fdch lesn\u00edch baldach\u00fdnech Havaje se odehr\u00e1v\u00e1 tich\u00fd boj o p\u0159e\u017eit\u00ed. Nov\u00e1 studie form\u00e1ln\u011b zdokumentovala fenom\u00e9n zn\u00e1m\u00fd jako kleptoparazitismus<\/strong> \u2013 akt, kdy jedno zv\u00ed\u0159e krade zdroje druh\u00e9mu \u2013 mezi endemick\u00fdmi pta\u010d\u00edmi druhy na ostrovech. <\/p>\n

P\u0159esto\u017ee ter\u00e9nn\u00ed v\u00fdzkumn\u00edci toto chov\u00e1n\u00ed ji\u017e dlouho tu\u0161ili, studie ned\u00e1vno publikovan\u00e1 v The American Naturalist<\/em> poskytuje prvn\u00ed p\u0159esn\u00e9, kvantitativn\u00ed d\u016fkazy, \u017ee pt\u00e1ci si navz\u00e1jem kradou hn\u00edzdn\u00ed materi\u00e1l. <\/p>\n

Ukradn\u011bte mechaniky<\/h3>\n

V\u011bdci z University of California, Riverside (UCR) pozorovali v\u00edce ne\u017e 200 hn\u00edzd p\u016fvodn\u00edch druh\u016f \u017eij\u00edc\u00edch v lesn\u00edm porostu na Big Islandu na Havaji. Studie se zam\u011b\u0159ila na n\u011bkolik kl\u00ed\u010dov\u00fdch druh\u016f, v\u010detn\u011b apapane<\/strong>, ii<\/strong> a havajsk\u00e9ho amakihi<\/strong>. <\/p>\n

V\u00fdsledky odhalily n\u011bkolik d\u016fle\u017eit\u00fdch vzorc\u016f toho, jak a pro\u010d k t\u011bmto \u201ezlo\u010din\u016fm\u201c doch\u00e1z\u00ed:<\/p>\n

    \n
  • Faktor bl\u00edzkosti:<\/strong> K v\u011bt\u0161in\u011b kr\u00e1de\u017e\u00ed do\u0161lo mezi hn\u00edzdy um\u00edst\u011bn\u00fdmi v podobn\u00fdch v\u00fd\u0161k\u00e1ch. To podporuje \u201ehypot\u00e9zu p\u0159ekryt\u00ed nadmo\u0159sk\u00e9 v\u00fd\u0161ky\u201c, kter\u00e1 nazna\u010duje, \u017ee pt\u00e1ci kradou materi\u00e1ly z hn\u00edzd, na kter\u00fdch se nach\u00e1zej\u00ed, kdy\u017e hledaj\u00ed potravu ve stejn\u00e9 lesn\u00ed vrstv\u011b. <\/li>\n
  • Kr\u00e1de\u017ee v r\u00e1mci jednoho typu:<\/strong> Je pozoruhodn\u00e9, \u017ee kr\u00e1de\u017ee nejsou omezeny na r\u016fzn\u00e9 typy. Bylo pozorov\u00e1no, \u017ee Apapane, jeden z nejpo\u010detn\u011bj\u0161\u00edch pt\u00e1k\u016f v t\u011bchto les\u00edch, \u010dasto kradl materi\u00e1ly od sv\u00e9ho vlastn\u00edho druhu. <\/li>\n
  • Vysok\u00e1 rizika:<\/strong> P\u0159esto\u017ee se kr\u00e1de\u017e v\u011btvi\u010dek a vl\u00e1ken m\u016f\u017ee zd\u00e1t jako efektivn\u00ed zp\u016fsob, jak si postavit hn\u00edzdo, nese s sebou v\u00e1\u017en\u00e1 biologick\u00e1 rizika. Ukraden\u00e9 materi\u00e1ly mohou do nov\u00e9ho hn\u00edzda zan\u00e9st parazity nebo nemoci<\/strong> a samotn\u00e1 kr\u00e1de\u017e m\u016f\u017ee vyvolat n\u00e1siln\u00e9 boje mezi pt\u00e1ky. <\/li>\n<\/ul>\n

    Hrozby \u00fasp\u011bchu hn\u00edzd\u011bn\u00ed<\/h3>\n

    A\u010dkoli mnoho kr\u00e1de\u017e\u00ed zahrnovalo opu\u0161t\u011bn\u00e1 hn\u00edzda, dopad na aktivn\u00ed chov je velk\u00fdm probl\u00e9mem. Studie zjistila, \u017ee:<\/p>\n

      \n
    1. Zasahov\u00e1n\u00ed do aktivn\u00edch hn\u00edzd:<\/strong> P\u0159ibli\u017en\u011b k 10 % kr\u00e1de\u017e\u00ed do\u0161lo v hn\u00edzdech, kter\u00e1 byla pr\u00e1v\u011b rozestav\u011bna nebo ji\u017e byla obsazena vejci nebo ku\u0159aty. <\/li>\n
    2. Selh\u00e1n\u00ed hn\u00edzda:<\/strong> V p\u0159ibli\u017en\u011b 5 % studovan\u00fdch p\u0159\u00edpad\u016f vedla kr\u00e1de\u017e k \u201eselh\u00e1n\u00ed hn\u00edzd\u011bn\u00ed\u201c, kdy rodi\u010de bu\u010f opustili lokalitu, nebo byla struktur\u00e1ln\u00ed integrita hn\u00edzda p\u0159\u00edli\u0161 naru\u0161ena na to, aby proces pokra\u010doval. <\/li>\n<\/ol>\n

      Pro\u010d na tom z\u00e1le\u017e\u00ed: \u0161ir\u0161\u00ed environment\u00e1ln\u00ed kontext<\/h3>\n

      Abychom pochopili, pro\u010d je toto chov\u00e1n\u00ed znepokojiv\u00e9, je nutn\u00e9 vz\u00edt v \u00favahu \u0161ir\u0161\u00ed environment\u00e1ln\u00ed tlaky, kter\u00fdm \u010del\u00ed havajsk\u00e1 divok\u00e1 zv\u011b\u0159. Tito endemi\u010dt\u00ed pt\u00e1ci jsou nyn\u00ed pod tlakem kv\u016fli n\u011bkolika konverguj\u00edc\u00edm faktor\u016fm:<\/p>\n

        \n
      • Ztr\u00e1ta a fragmentace biotop\u016f:<\/strong> S fragmentac\u00ed les\u016f jsou pt\u00e1ci nuceni p\u0159esouvat se do st\u00e1le men\u0161\u00edch a v\u00edce p\u0159epln\u011bn\u00fdch oblast\u00ed. <\/li>\n
      • Zm\u011bna klimatu a nemoci:<\/strong> Kom\u00e1\u0159i introdukovan\u00ed lidmi p\u0159en\u00e1\u0161ej\u00ed pta\u010d\u00ed mal\u00e1rii<\/strong>, co\u017e nut\u00ed p\u016fvodn\u00ed pt\u00e1ky ustoupit do vy\u0161\u0161\u00edch a chladn\u011bj\u0161\u00edch nadmo\u0159sk\u00fdch v\u00fd\u0161ek. <\/li>\n<\/ul>\n

        Jak jsou tito pt\u00e1ci vytla\u010dov\u00e1ni na mal\u00e9, vysokohorsk\u00e9 \u201eostrovy\u201c stanovi\u0161\u0165, konkurence o zdroje se zintenziv\u0148uje. Toto shlukov\u00e1n\u00ed pravd\u011bpodobn\u011b vyvol\u00e1v\u00e1 n\u00e1r\u016fst kleptoparazitismu. Kdy\u017e jsou hn\u00edzdi\u0161t\u011b a materi\u00e1ly vz\u00e1cn\u00e9, impuls ke kr\u00e1de\u017ei se st\u00e1v\u00e1 strategi\u00ed p\u0159e\u017eit\u00ed \u2013 i kdy\u017e tato strategie n\u011bkdy vede ke smrti hn\u00edzda. <\/p>\n

        \n

        \u201eTakov\u00e9 chov\u00e1n\u00ed se m\u016f\u017ee st\u00e1t \u010dast\u011bj\u0161\u00edm, pokud se materi\u00e1l pro hn\u00edzd\u011bn\u00ed nebo bezpe\u010dn\u00e1 m\u00edsta pro hn\u00edzd\u011bn\u00ed stanou vz\u00e1cn\u00fdmi,\u201c vysv\u011btluje hlavn\u00ed autorka studie Erin Wilson Rankin. <\/p>\n<\/blockquote>\n

        Z\u00e1v\u011br<\/h3>\n

        Tato studie zd\u016fraz\u0148uje skryt\u00e9 \u00farovn\u011b stresu v ji\u017e tak k\u0159ehk\u00e9m ekosyst\u00e9mu. D\u00edky identifikaci vzorc\u016f kr\u00e1de\u017e\u00ed hn\u00edzd budou ochr\u00e1nci p\u0159\u00edrody schopni l\u00e9pe p\u0159edv\u00eddat, kter\u00e9 druhy a stanovi\u0161t\u011b jsou nejzraniteln\u011bj\u0161\u00ed, co\u017e umo\u017en\u00ed c\u00edlen\u011bj\u0161\u00ed z\u00e1sahy na ochranu ub\u00fdvaj\u00edc\u00edch populac\u00ed p\u016fvodn\u00edch pt\u00e1k\u016f na Havaji.<\/p>\n","protected":false},"excerpt":{"rendered":"

        V bujn\u00fdch lesn\u00edch baldach\u00fdnech Havaje se odehr\u00e1v\u00e1 tich\u00fd boj o p\u0159e\u017eit\u00ed. Nov\u00e1 studie form\u00e1ln\u011b zdokumentovala fenom\u00e9n zn\u00e1m\u00fd jako kleptoparazitismus \u2013 akt, kdy jedno zv\u00ed\u0159e krade zdroje druh\u00e9mu \u2013 mezi endemick\u00fdmi pta\u010d\u00edmi druhy na ostrovech. P\u0159esto\u017ee ter\u00e9nn\u00ed v\u00fdzkumn\u00edci toto chov\u00e1n\u00ed ji\u017e dlouho tu\u0161ili, studie ned\u00e1vno publikovan\u00e1 v The American Naturalist poskytuje prvn\u00ed p\u0159esn\u00e9, kvantitativn\u00ed d\u016fkazy, \u017ee […]<\/p>\n","protected":false},"author":1,"featured_media":7669,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"tdm_status":"","tdm_grid_status":""},"categories":[1],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts\/7670"}],"collection":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/comments?post=7670"}],"version-history":[{"count":0,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts\/7670\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/media\/7669"}],"wp:attachment":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/media?parent=7670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/categories?post=7670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/tags?post=7670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}