{"id":2081,"date":"2021-06-16T09:00:08","date_gmt":"2021-06-16T09:00:08","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=2081"},"modified":"2021-06-16T09:00:08","modified_gmt":"2021-06-16T09:00:08","slug":"inaccessible-island-rail-flightless-evolution-conservation","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/cs\/science\/ornithology\/inaccessible-island-rail-flightless-evolution-conservation\/","title":{"rendered":"Endemick\u00fd nel\u00e9tav\u00fd pt\u00e1k z Nep\u0159\u00edstupn\u00e9ho ostrova: Evolu\u010dn\u00ed z\u00e1hada"},"content":{"rendered":"

Endemick\u00fd nel\u00e9tav\u00fd pt\u00e1k z nep\u0159\u00edstupn\u00e9ho ostrova<\/h2>\n\n

Genetick\u00e9 p\u016fvody a evolu\u010dn\u00ed historie<\/h2>\n\n

Nep\u0159\u00edstupn\u00fd ostrov, vzd\u00e1len\u00fd a nehostinn\u00fd ostrov v ji\u017en\u00edm Atlantsk\u00e9m oce\u00e1nu, je domovem jedine\u010dn\u00e9ho a tajemn\u00e9ho tvora: nep\u0159\u00edstupn\u00e9ho ch\u0159\u00e1stala ostrovn\u00edho. Tento mal\u00fd, nel\u00e9tav\u00fd pt\u00e1k dlouho m\u00e1t odborn\u00edky, kte\u0159\u00ed se sna\u017eili odhalit jeho evolu\u010dn\u00ed p\u016fvod a to, jak se dostal na tak izolovan\u00e9 m\u00edsto.<\/p>\n\n

Ned\u00e1vn\u00e9 genetick\u00e9 anal\u00fdzy vrhly na minulost pt\u00e1ka nov\u00e9 sv\u011btlo. V\u00fdzkumn\u00edci zjistili, \u017ee nep\u0159\u00edstupn\u00fd ch\u0159\u00e1stal ostrovn\u00ed je nejbl\u00ed\u017ee p\u0159\u00edbuzn\u00fd te\u010dkovan\u011b k\u0159\u00eddl\u00e9mu ch\u0159\u00e1stalu, pt\u00e1kovi, kter\u00fd \u017eije v ji\u017en\u00ed Ji\u017en\u00ed Americe. To nazna\u010duje, \u017ee ch\u0159\u00e1stal poch\u00e1z\u00ed z Ji\u017en\u00ed Ameriky a dostal se na nep\u0159\u00edstupn\u00fd ostrov p\u0159ed p\u0159ibli\u017en\u011b 1,5 miliony let.<\/p>\n\n

Cesta na nep\u0159\u00edstupn\u00fd ostrov<\/h2>\n\n

Jak se nep\u0159\u00edstupn\u00fd ch\u0159\u00e1stal ostrovn\u00ed dostal do sv\u00e9ho odlehl\u00e9ho stanovi\u0161t\u011b, je st\u00e1le p\u0159edm\u011btem debaty. Jedna teorie tvrd\u00ed, \u017ee pt\u00e1ci \u010d\u00e1st cesty p\u0159elet\u011bli, zat\u00edmco jin\u00e1 nazna\u010duje, \u017ee byli z kurzu vyvedeni bou\u0159\u00ed a p\u0159ist\u00e1li na trosk\u00e1ch. Bez ohledu na zp\u016fsob dopravy se ch\u0159\u00e1stalovi poda\u0159ilo zalo\u017eit populaci na nep\u0159\u00edstupn\u00e9m ostrov\u011b, kde prosperovali v nep\u0159\u00edtomnosti pred\u00e1tor\u016f a hojnosti zdroj\u016f potravy.<\/p>\n\n

Ztr\u00e1ta schopnosti l\u00e9tat a adaptace na ostrov<\/h2>\n\n

\u010casem ztratil nep\u0159\u00edstupn\u00fd ch\u0159\u00e1stal ostrovn\u00ed svou schopnost l\u00e9tat. Tato adaptace byla pravd\u011bpodobn\u011b zp\u016fsobena nedostatkem pred\u00e1tor\u016f a snadnost\u00ed z\u00edsk\u00e1v\u00e1n\u00ed potravy na ostrov\u011b. Bez nutnosti unikat nebezpe\u010d\u00ed nebo hledat vzd\u00e1len\u00e9 zdroje se k\u0159\u00eddla pt\u00e1k\u016f postupn\u011b zakrn\u011bla.<\/p>\n\n

Tento jev ztr\u00e1ty schopnosti l\u00e9tat nen\u00ed jedine\u010dn\u00fd pro nep\u0159\u00edstupn\u00e9ho ch\u0159\u00e1stala ostrovn\u00edho. Nejm\u00e9n\u011b 32 dal\u0161\u00edch druh\u016f ch\u0159\u00e1stal\u016f ztratilo nebo v\u00fdznamn\u011b omezilo svou schopnost l\u00e9tat, p\u0159i\u010dem\u017e v\u0161echny ob\u00fdvaj\u00ed konkr\u00e9tn\u00ed ostrovy. To nazna\u010duje, \u017ee ostrovn\u00ed ekosyst\u00e9my mohou na pta\u010d\u00ed populace vyv\u00edjet siln\u00fd selek\u010dn\u00ed tlak a up\u0159ednost\u0148ovat jedince se sn\u00ed\u017een\u00fdmi schopnostmi l\u00e9t\u00e1n\u00ed.<\/p>\n\n

Ekosyst\u00e9m nep\u0159\u00edstupn\u00e9ho ostrova<\/h2>\n\n

Nep\u0159\u00edstupn\u00fd ostrov poskytuje jedine\u010dn\u00e9 a nedot\u010den\u00e9 prost\u0159ed\u00ed pro nel\u00e9tav\u00e9 ch\u0159\u00e1staly. Ostrov je bez zavle\u010den\u00fdch pred\u00e1tor\u016f, jako jsou krysy, kter\u00e9 zdecimovaly pta\u010d\u00ed populace na jin\u00fdch ostrovech. D\u00edky tomu mohli ch\u0159\u00e1stali na sv\u00e9m izolovan\u00e9m ostrovn\u00edm ekosyst\u00e9mu prosperovat.<\/p>\n\n

Ekosyst\u00e9m ostrova se tak\u00e9 vyzna\u010duje hojn\u00fdmi zdroji potravy. Ch\u0159\u00e1stali se \u017eiv\u00ed r\u016fzn\u00fdmi rostlinami a hmyzem a p\u0159izp\u016fsobili se drsn\u00fdm podm\u00ednk\u00e1m ostrova, v\u010detn\u011b siln\u00fdch v\u011btr\u016f a omezen\u00fdch zdroj\u016f sladk\u00e9 vody.<\/p>\n\n

V\u00fdzvy pro zachov\u00e1n\u00ed<\/h2>\n\n

P\u0159es svou zem\u011bpisnou izolaci \u010del\u00ed nep\u0159\u00edstupn\u00fd ch\u0159\u00e1stal ostrovn\u00ed \u0159ad\u011b v\u00fdzev v oblasti ochrany p\u0159\u00edrody. Zavle\u010den\u00ed nep\u016fvodn\u00edch pred\u00e1tor\u016f, jako jsou krysy, by mohlo m\u00edt pro nel\u00e9tav\u00e9 pt\u00e1ky zni\u010duj\u00edc\u00ed d\u016fsledky. Krom\u011b toho p\u0159edstavuj\u00ed zm\u011bny klimatu a stoupaj\u00edc\u00ed hladina mo\u0159\u00ed potenci\u00e1ln\u00ed hrozby pro ostrovn\u00ed ekosyst\u00e9m.<\/p>\n\n

Na\u0161t\u011bst\u00ed z\u016fst\u00e1v\u00e1 nep\u0159\u00edstupn\u00fd ostrov pro \u010dlov\u011bka do zna\u010dn\u00e9 m\u00edry nep\u0159\u00edstupn\u00fd, co\u017e pom\u00e1h\u00e1 chr\u00e1nit ch\u0159\u00e1staly p\u0159ed ru\u0161en\u00edm a ni\u010den\u00edm jejich p\u0159irozen\u00e9ho prost\u0159ed\u00ed. Pokra\u010duj\u00edc\u00ed monitorov\u00e1n\u00ed a ochran\u00e1\u0159sk\u00e9 \u00fasil\u00ed jsou v\u0161ak nezbytn\u00e9 k zaji\u0161t\u011bn\u00ed p\u0159e\u017eit\u00ed tohoto jedine\u010dn\u00e9ho a ohro\u017een\u00e9ho druhu.<\/p>\n\n

Z\u00e1v\u011br<\/h2>\n\n

Nep\u0159\u00edstupn\u00fd ch\u0159\u00e1stal ostrovn\u00ed je d\u016fkazem pozoruhodn\u00e9 rozmanitosti a p\u0159izp\u016fsobivosti \u017eivota na Zemi. Jeho evolu\u010dn\u00ed cesta a adaptace na ostrov nab\u00edzej\u00ed cenn\u00e9 poznatky o procesech, kter\u00e9 utv\u00e1\u0159ej\u00ed v\u00fdvoj druh\u016f, a o v\u00fdznamu ochrany k\u0159ehk\u00fdch ekosyst\u00e9m\u016f.<\/p>","protected":false},"excerpt":{"rendered":"

Endemick\u00fd nel\u00e9tav\u00fd pt\u00e1k z nep\u0159\u00edstupn\u00e9ho ostrova Genetick\u00e9 p\u016fvody a evolu\u010dn\u00ed historie Nep\u0159\u00edstupn\u00fd ostrov, vzd\u00e1len\u00fd a nehostinn\u00fd ostrov v ji\u017en\u00edm Atlantsk\u00e9m oce\u00e1nu, je domovem jedine\u010dn\u00e9ho a tajemn\u00e9ho tvora: nep\u0159\u00edstupn\u00e9ho ch\u0159\u00e1stala ostrovn\u00edho.…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2335],"tags":[1647,136,4401,4403,4402,401],"class_list":["post-2081","post","type-post","status-publish","format-standard","hentry","category-ornithology","tag-adaptation","tag-evolution","tag-inaccessible-island-rail","tag-island-ecosystem","tag-flightless-bird","tag-conservation"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2081","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=2081"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2081\/revisions"}],"predecessor-version":[{"id":2082,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2081\/revisions\/2082"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=2081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=2081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=2081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}