Ve sv\u011bt\u011b pta\u010d\u00edho zp\u011bvu pr\u00e1v\u011b prob\u00edh\u00e1 pozoruhodn\u00e1 prom\u011bna. B\u011blohrdli ameri\u010dti v Kanad\u011b remixovali svou klasickou p\u00edse\u0148 a p\u0159edstavili novou, chytlavou variantu, kter\u00e1 se jako lavina roz\u0161\u00ed\u0159ila po cel\u00e9 zemi.<\/p>\n\n
Desetilet\u00ed byla p\u00edse\u0148 b\u011blohrda charakteristick\u00fdm zvukem kanadsk\u00fdch les\u016f: \u201e\u00d3, m\u00e9 sladk\u00e9 Kanado, Kanado, Kanado.\u201c Tato skladba slou\u017eila same\u010dk\u016fm k vymezen\u00ed teritoria a p\u0159il\u00e1k\u00e1n\u00ed partnerek.<\/p>\n\n
P\u0159ed zhruba dv\u011bma desetilet\u00edmi se v Britsk\u00e9 Kolumbii objevila nov\u00e1 verze p\u00edsn\u011b. M\u00edsto tradi\u010dn\u00edho t\u0159\u00ednotov\u00e9ho z\u00e1v\u011bru \u201eKanado\u201c za\u010d\u00ednaj\u00ed pt\u00e1ci zp\u00edvat s\u00e9rii rychl\u00fdch, opakuj\u00edc\u00edch se dvojtakt\u016f: \u201e\u00d3, m\u00e9 sladk\u00e9 Kana-Kana-Kana-Kanado.\u201c<\/p>\n\n
Varianta s dvojtakty rychle z\u00edskala na oblib\u011b a \u0161\u00ed\u0159ila se sm\u011brem na v\u00fdchod nap\u0159\u00ed\u010d Kanadou. V roce 2014 se stala dominantn\u00ed verz\u00ed v Albert\u011b a rychle nahrazovala p\u016fvodn\u00ed p\u00edse\u0148 i v Quebeku.<\/p>\n\n
V\u011bdci se domn\u00edvaj\u00ed, \u017ee za \u0161\u00ed\u0159en\u00ed nov\u00e9 p\u00edsn\u011b m\u016f\u017ee kombinace faktor\u016f v\u010detn\u011b migra\u010dn\u00edch tras a spole\u010densk\u00fdch interakc\u00ed. B\u011bhem sez\u00f3nn\u00ed migrace se b\u011blohrdli z v\u00fdchodn\u00ed Kanady m\u00eds\u00ed se zimuj\u00edc\u00edmi pt\u00e1ky z Britsk\u00e9 Kolumbie, kde je dvojtaktn\u00ed varianta ji\u017e zaveden\u00e1. Mlad\u00ed same\u010dci z v\u00fdchodu se nau\u010d\u00ed chytlavou novou melodii a p\u0159in\u00e1\u0161ej\u00ed ji zp\u011bt na hn\u00edzdi\u0161t\u011b.<\/p>\n\n
D\u016fvod, pro\u010d se dvojtaktn\u00ed varianta stala mezi b\u011blohrda tak popul\u00e1rn\u00ed, z\u016fst\u00e1v\u00e1 z\u00e1hadou. V\u011bdci ale spekuluj\u00ed, \u017ee m\u016f\u017ee poskytovat v\u00fdhodu p\u0159i obhajob\u011b teritoria nebo p\u0159i p\u0159itahov\u00e1n\u00ed partnerek.<\/p>\n\n
Roz\u0161\u00ed\u0159en\u00ed nov\u00e9 varianty p\u00edsn\u011b u b\u011blohrda je p\u0159\u00edkladem kulturn\u00ed evoluce v pta\u010d\u00edm zp\u011bvu. Kulturn\u00ed evoluce ozna\u010duje p\u0159ed\u00e1v\u00e1n\u00ed a modifikov\u00e1n\u00ed chov\u00e1n\u00ed a tradic v r\u00e1mci populace prost\u0159ednictv\u00edm soci\u00e1ln\u00edho u\u010den\u00ed.<\/p>\n\n
Variace v p\u00edsn\u00edch jsou mezi pt\u00e1ky b\u011b\u017en\u00e9 a mohou v\u00fdznamn\u011b ovlivnit jejich chov\u00e1n\u00ed a ekologii. U b\u011blohrda m\u016f\u017ee nov\u00e1 dvojtaktn\u00ed p\u00edse\u0148 v\u00e9st ke zm\u011bn\u00e1m v hranic\u00edch teritori\u00ed a p\u00e1\u0159ic\u00edch vzorc\u00edch.<\/p>\n\n
Zat\u00edmco se dvojtaktn\u00ed varianta stala dominantn\u00ed v mnoha oblastech Kanady, p\u016fvodn\u00ed p\u00edse\u0148 st\u00e1le p\u0159etrv\u00e1v\u00e1 v n\u011bkter\u00fdch populac\u00edch. V Britsk\u00e9 Kolumbii, kde nov\u00e1 p\u00edse\u0148 vznikla, u\u017e pt\u00e1ci experimentuj\u00ed s dal\u0161\u00edmi obm\u011bnami. To nazna\u010duje, \u017ee kulturn\u00ed evoluce p\u00edsn\u011b b\u011blohrda je st\u00e1le prob\u00edhaj\u00edc\u00edm procesem.<\/p>\n\n
Prom\u011bna p\u00edsn\u011b b\u011blohrda americk\u00e9ho je fascinuj\u00edc\u00edm p\u0159\u00edkladem toho, jak se pt\u00e1ci dok\u00e1\u017e\u00ed u\u010dit, p\u0159izp\u016fsobovat se a p\u0159ed\u00e1vat nov\u00e9 vzorce chov\u00e1n\u00ed v r\u00e1mci sv\u00fdch populac\u00ed. Roz\u0161\u00ed\u0159en\u00ed dvojtaktn\u00ed varianty nap\u0159\u00ed\u010d Kanadou zd\u016fraz\u0148uje dynamickou povahu kulturn\u00ed evoluce v pta\u010d\u00edm zp\u011bvu.<\/p>","protected":false},"excerpt":{"rendered":"
B\u011blohrdli ameri\u010dt\u00ed zp\u00edvaj\u00ed nov\u00fd remix Nov\u00e1 variace p\u00edsn\u011b se \u0161\u00ed\u0159\u00ed nap\u0159\u00ed\u010d Kanadou Ve sv\u011bt\u011b pta\u010d\u00edho zp\u011bvu pr\u00e1v\u011b prob\u00edh\u00e1 pozoruhodn\u00e1 prom\u011bna. B\u011blohrdli ameri\u010dti v Kanad\u011b remixovali svou klasickou p\u00edse\u0148 a p\u0159edstavili…<\/p>\n","protected":false},"author":2,"featured_media":25467,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[2958,2959,254,252,2957],"class_list":["post-1311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zoology","tag-birdsong","tag-cultural-evolution","tag-wildlife","tag-nature","tag-white-throated-sparrow"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1311","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=1311"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1311\/revisions"}],"predecessor-version":[{"id":25468,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1311\/revisions\/25468"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media\/25467"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=1311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=1311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=1311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}