{"id":5005836,"date":"2009-08-01T18:37:48","date_gmt":"2009-08-01T16:37:48","guid":{"rendered":"https:\/\/criticalbiomass.blog.hu\/2009\/08\/01\/a_baranyok_osszemennek"},"modified":"2009-08-01T18:37:48","modified_gmt":"2009-08-01T16:37:48","slug":"a_baranyok_osszemennek","status":"publish","type":"post","link":"https:\/\/criticalbiomass.hu\/?p=5005836","title":{"rendered":"A b\u00e1r\u00e1nyok \u00f6sszemennek"},"content":{"rendered":"<p>\n<img src=\"http:\/\/criticalbiomass.blog.hu\/media\/image\/200908\/st_kilda_sheep.jpg\" align=\"left\" hspace=\"5\" vspace=\"5\" \/>Az, hogy egy-egy szigeten, az izol\u00e1ci\u00f3ban ott rekedt fajok m\u00e9rete az id\u0151k sor\u00e1n a term\u00e9szetes szelekci\u00f3nak k\u00f6sz\u00f6nhet\u0151en <a href=\"http:\/\/criticalbiomass.blog.hu\/media\/image\/200908\/\">lecs\u00f6kken<\/a>, nem nevezhet\u0151 mer\u0151ben \u00faj felismer\u00e9snek, s \u00edgy ennek f\u00e9ny\u00e9ben els\u0151re ak\u00e1r meglep\u0151nek is t\u0171nhet, hogy a sk\u00f3ciai <a href=\"http:\/\/en.wikipedia.org\/wiki\/St_Kilda,_Scotland\">St. Kilda sziget\u00e9n<\/a> \u00e9l\u0151 Soay birk\u00e1k m\u00e9retcs\u00f6kken\u00e9se hirtelen a h\u00edrek k\u00f6z\u00e9ppontj\u00e1ba ker\u00fclt.\n<\/p>\n<p>\nA kulcs azonban az, hogy ez esetben nem az evol\u00faci\u00f3 a ludas az elm\u00falt negyed \u00e9vsz\u00e1zad alatt bek\u00f6vetkez\u0151 5%-os &quot;t\u00f6p\u00f6r\u00f6d\u00e9sben&quot;, hanem a kl\u00edmav\u00e1ltoz\u00e1s.\n<\/p>\n<p>\nA birk\u00e1k m\u00e9ret\u00e9t alapvet\u0151en a sziget el\u00e9g kem\u00e9ny teleinek hossza hat\u00e1rozza meg: a zord kl\u00edm\u00e1ban, aki t\u00fal kev\u00e9s zs\u00edrt halmoz fel, nem felt\u00e9tlen\u00fcl \u00e9ri meg a tavaszt, r\u00e1ad\u00e1sul, mint a <a href=\"http:\/\/www.coolantarctica.com\/Antarctica%20fact%20file\/science\/cold_penguins.htm\">pingvinek p\u00e9ld\u00e1j\u00e1b\u00f3l<\/a> tudjuk, a nagyobb m\u00e9ret\u0171 \u00e1llatokn\u00e1l a fel\u00fclet-testt\u00f6meg ar\u00e1ny ide\u00e1lisabb a h\u0151lead\u00e1s szempontj\u00e1b\u00f3l.\n<\/p>\n<p>\nSt. Kild\u00e1n azonban az elm\u00falt \u00e9vekben egyre k\u00e9s\u0151bb j\u00f6tt meg a t\u00e9l \u00e9s egyre kor\u00e1bban a tavasz. Azaz azon id\u0151szak hossza, amit hidegben, \u00e9hkoppon kell kih\u00fazni lecs\u00f6kkent, s \u00edgy sok olyan birka is meg\u00e9rte, ami kor\u00e1bban biztos pusztul\u00e1sra lett volna \u00edt\u00e9lve. Ilyenek pl. a nagyon fiatal any\u00e1k ut\u00f3dai, amelyek nemcsak kisebb tests\u00fallyal sz\u00fcletnek mint m\u00e1s b\u00e1r\u00e1nyok, de soha nem is lesznek k\u00e9pesek a k\u00fcl\u00f6nbs\u00e9get behozni. Negyed \u00e9vsz\u00e1zad ut\u00e1n ez a trend v\u00e9g\u00fcl a teljes \u00e1llom\u00e1ny &quot;m\u00e9retcs\u00f6kken\u00e9s\u00e9hez&quot; vezetett.\n<\/p>\n<p>\n \u00cdgy az egyre kor\u00e1bban <a href=\"http:\/\/www.climatewatch.org.au\/News\/With-global-warming-the-flowering-times-change\">vir\u00e1gz\u00f3 n\u00f6v\u00e9nyek<\/a> mellett, a Soay b\u00e1r\u00e1nyok folyamatos zsugorod\u00e1sa mind-mind az egyre <a href=\"http:\/\/criticalbiomass.blog.hu\/media\/image\/200908\/\">siet\u0151sebb tavasz<\/a>, a napjaink r\u00e9sz\u00e9v\u00e9 v\u00e1lt kl\u00edmav\u00e1ltoz\u00e1s h\u00edrn\u00f6kei.\u00a0 \u00a0 \n<\/p>\n<hr \/>\n<p><font size=\"1\"><br \/>\n<strong>Ozgul A, Tuljapurkar S, Benton TG, Pemberton JM, Clutton-Brock TH, Coulson T.<\/strong> (2009) The dynamics of phenotypic change and the shrinking sheep of St. Kilda. <i>Science<\/i> <strong>325<\/strong>: 464-467.<br \/>\n<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Az, hogy egy-egy szigeten, az izol\u00e1ci\u00f3ban ott rekedt fajok m\u00e9rete az id\u0151k sor\u00e1n a term\u00e9szetes szelekci\u00f3nak k\u00f6sz\u00f6nhet\u0151en lecs\u00f6kken, nem nevezhet\u0151 mer\u0151ben \u00faj felismer\u00e9snek, s \u00edgy ennek f\u00e9ny\u00e9ben els\u0151re ak\u00e1r meglep\u0151nek is t\u0171nhet, hogy a sk\u00f3ciai St. Kilda sziget\u00e9n \u00e9l\u0151 Soay &hellip; <a href=\"https:\/\/criticalbiomass.hu\/?p=5005836\">Egy kattint\u00e1s ide a folytat\u00e1shoz&#8230;. <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005836"}],"collection":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5005836"}],"version-history":[{"count":0,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005836\/revisions"}],"wp:attachment":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5005836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5005836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5005836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}