{"id":695,"date":"2017-05-31T10:46:17","date_gmt":"2017-05-31T08:46:17","guid":{"rendered":"http:\/\/cke.cz\/?p=695"},"modified":"2017-08-07T13:52:46","modified_gmt":"2017-08-07T11:52:46","slug":"do-predator-energy-demands-or-previous-exposure-influence-protection-by-aposematic-coloration-of-prey","status":"publish","type":"post","link":"http:\/\/cke.cz\/cs_CZ\/2017\/05\/31\/do-predator-energy-demands-or-previous-exposure-influence-protection-by-aposematic-coloration-of-prey\/","title":{"rendered":"Do predator energy demands or previous exposure influence protection by aposematic coloration of prey?"},"content":{"rendered":"<h2>2017<\/h2>\n<h4><a href=\"http:\/\/cke.cz\/2017\/05\/30\/petr-vesely\/\">Petr Vesel\u00fd<\/a>, Barbora Ernestov\u00e1, Old\u0159ich Nedv\u011bd, <a href=\"http:\/\/cke.cz\/2017\/05\/30\/roman-fuchs\/\">Roman Fuchs<\/a><\/h4>\n<h3><a href=\"https:\/\/doi.org\/10.1093\/cz\/zow057\" target=\"_blank\" rel=\"noopener noreferrer\">DOI: 10.1093\/cz\/zow057<\/a><\/h3>\n<hr \/>\n<p>Dravci se sna\u017e\u00ed ulovit ko\u0159ist a ko\u0159ist by se zase moc r\u00e1da tomuto osudu vyhnula. \u017divo\u010dichov\u00e9, kte\u0159\u00ed v p\u0159\u00edrod\u011b hraj\u00ed roli ko\u0159isti, maj\u00ed k dispozici r\u016fzn\u00e9 triky, s jejich\u017e pomoc\u00ed zvy\u0161uj\u00ed sv\u00e9 \u0161ance. Jedn\u00edm z nich je i v\u00fdstra\u017en\u00e9 zbarven\u00ed. Nejde o \u017e\u00e1dn\u00e9 maskov\u00e1n\u00ed. Potenci\u00e1ln\u00ed ko\u0159ist se naopak velice sna\u017e\u00ed, aby o sob\u011b dala dravci v\u011bd\u011bt a upozornila ho na to, \u017ee je nechutn\u00e1, nepo\u017eivateln\u00e1 nebo dokonce jedovat\u00e1. Takov\u00e9 zbarven\u00ed se vyskytuje hlavn\u011b u hmyzu, a pak tak\u00e9 u \u017eab, plaz\u016f, ryb a dal\u0161\u00edch \u017eivo\u010dich\u016f.<br \/>\n<a href=\"http:\/\/www.prf.jcu.cz\/veda\/nase-objevy\/ovlivnuje-kondice-dravce-ucinnost-vystrazneho-zbarveni-koristi.html\" target=\"_blank\" rel=\"noopener\">\u010ct\u011bte v\u00edce na webu P\u0159F JU.<\/a><\/p>\n<p><em><strong>Anglick\u00fd abstrakt:<\/strong><\/em><\/p>\n<p>Growing evidence exists that aposematic and toxic prey may be included in a predator\u2019s diet when the predator experiences physiological stress. The tree sparrow <em>Passer montanus<\/em> is known to have a significant portion of aposematic and toxic ladybirds in its natural diet. Here, we present experiments testing the attack and eating rate of the tree sparrow toward the invasive aposematic harlequin ladybird <em>Harmonia axyridis.<\/em> We wondered whether the sparrow\u2019s ability to prey on native ladybirds predisposes them to also prey on harlequin ladybirds. We compared the attack and eating rates of tree sparrows of particular age and\/or experience classes to test for any changes during ontogeny (hand-reared \u00d7 young wild-caught \u00d7adult wild-caught) and with differing perceived levels of physiological stress (summer adult \u00d7 winter adult). Winter adult tree sparrows commonly attacked and ate the offered ladybirds with no evidence of disgust or metabolic difficulties after ingestion. Na\u00efve and wild immature tree sparrows attacked the ladybirds but hesitated to eat them. Adult tree sparrows caught in the summer avoided attacking the ladybirds. These results suggest that tree sparrows are able to cope with chemicals ingested along with the ladybirds. This pre-adaptation enables them to include ladybirds in their diet; though they commonly do this only in times of shortage in insect availability (winter). Young sparrows showed avoidance toward the chemical protection of the ladybirds.<\/p>\n<hr \/>\n<h1>Zp\u011bt na <a href=\"http:\/\/cke.cz\/publication\/scientific-papers\/\">v\u011bdeck\u00e9 \u010dl\u00e1nky<\/a>.<\/h1>\n","protected":false},"excerpt":{"rendered":"<h2>2017<\/h2>\n<h4><a href=\"http:\/\/cke.cz\/2017\/05\/30\/petr-vesely\/\">Petr Vesel\u00fd<\/a>, Barbora Ernestov\u00e1, Old\u0159ich Nedv\u011bd, <a href=\"http:\/\/cke.cz\/2017\/05\/30\/roman-fuchs\/\">Roman Fuchs<\/a><\/h4>\n<h3><a href=\"https:\/\/doi.org\/10.1093\/cz\/zow057\" target=\"_blan...\n<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"_links":{"self":[{"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/posts\/695"}],"collection":[{"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/comments?post=695"}],"version-history":[{"count":11,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/posts\/695\/revisions"}],"predecessor-version":[{"id":1339,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/posts\/695\/revisions\/1339"}],"wp:attachment":[{"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/media?parent=695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/categories?post=695"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/cke.cz\/cs_CZ\/wp-json\/wp\/v2\/tags?post=695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}