B\u011bhem sv\u00e9 slavn\u00e9 plavby narazil Charles Darwin na Falklandsk\u00fdch ostrovech na jedine\u010dn\u00e9ho psovit\u00e9ho tvora – \u201evelk\u00e9ho vlka p\u0159ipom\u00ednaj\u00edc\u00ed li\u0161ku\u201c, odli\u0161n\u00e9ho ode v\u0161ech ostatn\u00edch na sv\u011bt\u011b. Darwin rozpoznal v\u00fdznam tohoto objevu a poznamenal, \u017ee takov\u00fd velk\u00fd suchozemsk\u00fd savec je na tak mal\u00e9m, izolovan\u00e9m ostrov\u011b neobvykl\u00fd.<\/p>\n\n
Navzdory sv\u00e9 jedine\u010dn\u00e9 povaze \u010delil falkandsk\u00fd vlk mnoha v\u00fdzv\u00e1m. Rostouc\u00ed lidsk\u00e1 populace a zaveden\u00ed ovc\u00ed vedly k jeho \u00fapadku. Darwin p\u0159edpov\u011bd\u011bl eventu\u00e1ln\u00ed vyhynut\u00ed druhu, kter\u00e9 bohu\u017eel nastalo v roce 1876.<\/p>\n\n
Od Darwinovy doby zkoumali v\u011bdci p\u016fvod a evoluci falkandsk\u00e9ho vlka. Aby z\u00edskali poznatky o jeho historii, extrahovali v\u011bdci DNA z muzejn\u00edch vzork\u016f, v\u010detn\u011b jednoho, kter\u00fd nasb\u00edral s\u00e1m Darwin.<\/p>\n\n
Porovn\u00e1n\u00edm DNA falkandsk\u00e9ho vlka s jin\u00fdmi psovit\u00fdmi sestavili v\u011bdci fylogenetick\u00fd strom. Tato anal\u00fdza odhalila, \u017ee se falkandsk\u00fd vlk odd\u011blil od sv\u00fdch nejbli\u017e\u0161\u00edch p\u0159\u00edbuzn\u00fdch p\u0159ibli\u017en\u011b p\u0159ed 70 000 lety, co\u017e se shoduje s posledn\u00ed dobou ledovou.<\/p>\n\n
Fylogenetick\u00fd strom tak\u00e9 nazna\u010duje, \u017ee falkandsk\u00fd vlk dorazil na ostrovy b\u011bhem pleistoc\u00e9nu. V\u011bdci se domn\u00edvaj\u00ed, \u017ee vlci mohli doplout na ostrovy na ledu nebo kmenech strom\u016f, nebo p\u0159ekro\u010dit ledovec.<\/p>\n\n
Po p\u0159\u00edchodu na ostrovy se falkandsk\u00fd vlk p\u0159izp\u016fsobil sv\u00e9mu prost\u0159ed\u00ed. Bez jin\u00fdch p\u016fvodn\u00edch suchozemsk\u00fdch savc\u016f se pravd\u011bpodobn\u011b \u017eivil tu\u010d\u0148\u00e1ky, husami a ploutvono\u017eci.<\/p>\n\n
Fylogenetick\u00e1 anal\u00fdza odhalila neo\u010dek\u00e1van\u00fd vztah mezi falkandsk\u00fdm vlkem a vlkem h\u0159ivnat\u00fdm. Tyto dva druhy sd\u00edlej\u00ed spole\u010dn\u00e9ho p\u0159edka, ale odd\u011blily se p\u0159ed v\u00edce ne\u017e 6 miliony let. Tento objev vyvol\u00e1v\u00e1 ot\u00e1zky o evolu\u010dn\u00ed historii psovit\u00fdch v Ji\u017en\u00ed Americe.<\/p>\n\n
P\u0159esto\u017ee anal\u00fdza DNA poskytla cenn\u00e9 poznatky, vyvolala tak\u00e9 nov\u00e1 tajemstv\u00ed. Zat\u00edm nebyly nalezeny \u017e\u00e1dn\u00e9 fosilie psovit\u00fdch z obdob\u00ed, kdy se falkandsk\u00fd vlk a vlk h\u0159ivnat\u00fd odd\u011blili. Budouc\u00ed v\u00fdzkum si klade za c\u00edl zaplnit tyto mezery v na\u0161ich znalostech.<\/p>\n\n
Muzejn\u00ed vzorky shrom\u00e1\u017ed\u011bn\u00e9 Darwinem a dal\u0161\u00edmi sehr\u00e1ly z\u00e1sadn\u00ed roli p\u0159i odhalov\u00e1n\u00ed historie falkandsk\u00e9ho vlka. Tyto vzorky poskytuj\u00ed hodnotn\u00fd genetick\u00fd materi\u00e1l pro anal\u00fdzu DNA, co\u017e v\u011bdc\u016fm umo\u017e\u0148uje rekonstruovat evolu\u010dn\u00ed minulost druhu.<\/p>\n\n
P\u0159\u00edb\u011bh falkandsk\u00e9ho vlka je d\u016fkazem s\u00edly v\u011bdeck\u00e9ho zkoum\u00e1n\u00ed. P\u0159esto\u017ee bylo zodpov\u011bzeno mnoho ot\u00e1zek, z\u00e1hada nejbli\u017e\u0161\u00edho p\u0159\u00edbuzn\u00e9ho vlka h\u0159ivnat\u00e9ho z\u016fst\u00e1v\u00e1 nevy\u0159e\u0161ena. Pokra\u010duj\u00edc\u00ed v\u00fdzkum nad\u00e1le osv\u011btluje slo\u017eit\u00e9 evolu\u010dn\u00ed vztahy mezi psovit\u00fdmi a jedine\u010dn\u00e9 adaptace druh\u016f na jejich prost\u0159ed\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"
Falkandsk\u00fd vlk: Darwin\u016fv z\u00e1had vy\u0159e\u0161en Darwin\u016fv objev B\u011bhem sv\u00e9 slavn\u00e9 plavby narazil Charles Darwin na Falklandsk\u00fdch ostrovech na jedine\u010dn\u00e9ho psovit\u00e9ho tvora – \u201evelk\u00e9ho vlka p\u0159ipom\u00ednaj\u00edc\u00ed li\u0161ku\u201c, odli\u0161n\u00e9ho ode v\u0161ech ostatn\u00edch…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[3587,514,136,3586,3588,141,613,3589,400],"class_list":["post-1657","post","type-post","status-publish","format-standard","hentry","category-zoology","tag-canids","tag-darwin","tag-evolution","tag-falklands-wolf","tag-phylogenetics","tag-natural-history","tag-scientific-discovery","tag-maned-wolf","tag-extinction"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1657","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=1657"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1657\/revisions"}],"predecessor-version":[{"id":1658,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1657\/revisions\/1658"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=1657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=1657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=1657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}