V\u011bdci se tradi\u010dn\u011b domn\u00edvali, \u017ee tmavost skvrn \u017eirafy byla prim\u00e1rn\u011b indik\u00e1torem v\u011bku. Ned\u00e1vn\u00fd v\u00fdzkum veden\u00fd Madelaine Castlesovou z University of Queensland v\u0161ak tuto domn\u011bnku zpochybnil.<\/p>\n\n
Castlesova studie, publikovan\u00e1 v \u010dasopise Animal Behaviour, zjistila, \u017ee samci \u017eiraf s tmav\u0161\u00edmi skvrnami maj\u00ed tendenci b\u00fdt dominantn\u011bj\u0161\u00ed a samot\u00e1\u0159\u0161t\u011bj\u0161\u00ed ne\u017e jejich sv\u011btlej\u0161\u00ed prot\u011bj\u0161ky. Tento objev nazna\u010duje, \u017ee barva skvrn m\u016f\u017ee hr\u00e1t v\u00fdznamnou roli v soci\u00e1ln\u00ed dynamice \u017eiraf.<\/p>\n\n
Studie byla provedena v pr\u016fb\u011bhu 12 let a zahrnovala pozorov\u00e1n\u00ed 66 samc\u016f \u017eiraf v namibijsk\u00e9m n\u00e1rodn\u00edm parku Etosha. V\u00fdzkumn\u00edci shrom\u00e1\u017edili 1 793 fotografi\u00ed a vypo\u010d\u00edtali spole\u010denskost a sociabilitu ka\u017ed\u00e9 \u017eirafy, kter\u00e9 byly m\u011b\u0159eny mno\u017estv\u00edm \u010dasu str\u00e1ven\u00e9ho o samot\u011b nebo ve skupin\u011b.<\/p>\n\n
V\u00fdsledky uk\u00e1zaly, \u017ee zat\u00edmco skvrny v\u011bt\u0161iny \u017eiraf s v\u011bkem tmavnou, existuj\u00ed v\u00fdznamn\u00e9 v\u00fdjimky z tohoto trendu. N\u011bkter\u00e9 \u017eirafy si zachov\u00e1vaj\u00ed sv\u00e9 sv\u011btl\u00e9 zbarven\u00ed po cel\u00fd \u017eivot, zat\u00edmco jin\u00e9 ve skute\u010dnosti blednou s p\u0159ib\u00fdvaj\u00edc\u00edm v\u011bkem. To nazna\u010duje, \u017ee barva skvrn nen\u00ed pouze znak zalo\u017een\u00fd na v\u011bku, ale mohla by b\u00fdt ovlivn\u011bna tak\u00e9 dal\u0161\u00edmi faktory, jako je genetika nebo fyzick\u00fd stav.<\/p>\n\n
Studie tak\u00e9 odhalila, \u017ee samci \u017eiraf s tmav\u011b zbarven\u00fdmi skvrnami maj\u00ed odli\u0161nou strategii p\u00e1\u0159en\u00ed. Maj\u00ed tendenci toulat se sami a pohybovat se mezi skupinami p\u0159i hled\u00e1n\u00ed potenci\u00e1ln\u00edch partnerek. Tato strategie je \u010dasto \u00fasp\u011b\u0161n\u00e1, ale je tak\u00e9 riskantn\u00ed.<\/p>\n\n
Naproti tomu samci \u017eiraf se sv\u011btlej\u0161\u00edmi barvami \u010dast\u011bji cestuj\u00ed ve st\u00e1dech se samicemi. To m\u016f\u017ee b\u00fdt zp\u016fsob, jak zv\u00fd\u0161it sv\u00e9 \u0161ance na p\u00e1\u0159en\u00ed, proto\u017ee samice mohou b\u00fdt ochotn\u011bj\u0161\u00ed p\u00e1\u0159it se se zn\u00e1m\u00fdmi samci.<\/p>\n\n
V\u00fdzkumn\u00edci spekuluj\u00ed, \u017ee barva skvrn m\u016f\u017ee souviset s fyzick\u00fdm stavem samce \u017eirafy. Tmav\u0161\u00ed skvrny by mohly indikovat vy\u0161\u0161\u00ed hladiny testosteronu, lep\u0161\u00ed v\u00fd\u017eivu nebo zlep\u0161en\u00fd celkov\u00fd zdravotn\u00ed stav.<\/p>\n\n
Tuto hypot\u00e9zu podporuje skute\u010dnost, \u017ee lvi, kte\u0159\u00ed maj\u00ed podobnou soci\u00e1ln\u00ed strukturu jako \u017eirafy, tak\u00e9 vykazuj\u00ed vztah mezi barvou srsti a fyzickou kondic\u00ed. Lvi s tmav\u0161\u00edmi h\u0159\u00edvami maj\u00ed tendenci b\u00fdt dominantn\u011bj\u0161\u00ed a m\u00edt v\u011bt\u0161\u00ed reproduk\u010dn\u00ed \u00fasp\u011bch.<\/p>\n\n
V\u00fdzkumn\u00edci pl\u00e1nuj\u00ed budouc\u00ed studie, aby prozkoumali, jak barva skvrn signalizuje fyzick\u00fd stav samce \u017eirafy. Budou tak\u00e9 zkoumat potenci\u00e1ln\u00ed vliv environment\u00e1ln\u00edch faktor\u016f, jako je teplotn\u00ed stres a strava, na zbarven\u00ed skvrn.<\/p>\n\n
Studie Castlesov\u00e9 a jej\u00edch koleg\u016f vrhla nov\u00e9 sv\u011btlo na v\u00fdznam barvy skvrn v soci\u00e1ln\u00edm chov\u00e1n\u00ed \u017eiraf. Barva skvrn nemus\u00ed pouze nazna\u010dovat v\u011bk, ale poskytuje tak\u00e9 cenn\u00e9 informace o spole\u010densk\u00e9m postaven\u00ed \u017eirafy, fyzick\u00e9m stavu a strategii p\u00e1\u0159en\u00ed. Tento v\u00fdzkum otev\u00edr\u00e1 nov\u00e9 cesty k pochopen\u00ed slo\u017eit\u00e9 spole\u010densk\u00e9 dynamiky t\u011bchto fascinuj\u00edc\u00edch zv\u00ed\u0159at.<\/p>","protected":false},"excerpt":{"rendered":"
Zbarven\u00ed skvrn \u017eirafy: Odraz spole\u010densk\u00e9ho postaven\u00ed a fyzick\u00e9ho stavu Barva skvrn a spole\u010densk\u00e1 dominance V\u011bdci se tradi\u010dn\u011b domn\u00edvali, \u017ee tmavost skvrn \u017eirafy byla prim\u00e1rn\u011b indik\u00e1torem v\u011bku. Ned\u00e1vn\u00fd v\u00fdzkum veden\u00fd Madelaine…<\/p>\n","protected":false},"author":6,"featured_media":23976,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[16560,309,23557,5292,23556],"class_list":["post-17981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zoology","tag-wildlife-biology","tag-animal-behavior","tag-spot-coloration","tag-social-behavior","tag-giraffe"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/17981","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=17981"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/17981\/revisions"}],"predecessor-version":[{"id":17982,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/17981\/revisions\/17982"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media\/23976"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=17981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=17981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=17981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}