{"id":11798,"date":"2018-07-19T07:12:55","date_gmt":"2018-07-19T04:12:55","guid":{"rendered":"http:\/\/109.232.216.219\/~bilimvegelecek\/?p=11798"},"modified":"2018-07-16T16:20:18","modified_gmt":"2018-07-16T13:20:18","slug":"beyaz-tilkinin-izleri-tibete-dayaniyor","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/07\/19\/beyaz-tilkinin-izleri-tibete-dayaniyor","title":{"rendered":"Beyaz tilkinin izleri Tibet\u2019e dayan\u0131yor"},"content":{"rendered":"<p>Kutup tilkisi ya da beyaz tilki olarak da bilinen <em>Vulpes lagopus<\/em>\u2019un 2,6 milyon y\u0131l \u00f6nce buzul d\u00f6nemi Avrupas\u0131\u2019nda evrildi\u011fi d\u00fc\u015f\u00fcn\u00fcl\u00fcyordu. Ancak \u015fimdiki fosil kan\u0131tlar\u0131 bu hayvanlar\u0131n, so\u011fuk ve sert iklimde ya\u015fayabilmek i\u00e7in azametli Tibet b\u00f6lgesinde \u00f6n-adapte oldu\u011funu g\u00f6sterdi.<\/p>\n<p>California L.A Do\u011fa Tarihi M\u00fczesi\u2019nde paleontolog olarak \u00e7al\u0131\u015fan Xiaoming Wang ve arkada\u015flar\u0131 Tibet Da\u011flar\u0131\u2019na yapt\u0131klar\u0131 t\u0131rman\u0131\u015flarda deniz seviyesinden 4.730 metre y\u00fckseklikte \u00e7ene kemi\u011fi ve di\u015f kal\u0131nt\u0131lar\u0131na rastlad\u0131lar.<\/p>\n<p>Buluntular\u0131n bilinen 20 tilki t\u00fcr\u00fcyle e\u015fle\u015fen \u00f6zellikleri olmad\u0131\u011f\u0131ndan \u00e7al\u0131\u015fma ekibi bunu yeni bir t\u00fcr olarak tan\u0131mlad\u0131 ve Beijing \u00c7in Bilimleri Akademisi\u2019nin \u00f6nde gelen isimlerinden paleontolog Qiu Zhuding onuruna yeni t\u00fcre <em>Vulpes qiuzhudingi a<\/em>d\u0131n\u0131 verdiler.<\/p>\n<p>Pek \u00e7ok tilki hem ot hem de et yer. Fakat <em>V. qiuzhuding\u2019<\/em>in di\u015fleri, \u00e7o\u011funlukla etle beslendi\u011fini ve so\u011fuk co\u011frafyada ya\u015fayan kutup ay\u0131lar\u0131, beyaz tilki ve kurtlarla benzer \u201ca\u015f\u0131r\u0131 et yiyen \u201c yap\u0131da bir dental adaptasyona sahip oldu\u011funu g\u00f6steriyordu.<\/p>\n<p>Materyaller 3,6-5,1 milyon y\u0131ll\u0131k kayalardan \u00e7\u0131kar\u0131ld\u0131. Wang\u2019a g\u00f6re bu \u00f6rnekler kuzey kutbu tilkisinin kuzey kutbu d\u0131\u015f\u0131nda rastlanan ilk izleri ve yakla\u015f\u0131k 3-4 milyon y\u0131l \u00f6ncesine dayan\u0131yorlar. Yani Tibet\u2019in tepelerinde kuzey kutbu tilkisinin atalar\u0131na rastlanm\u0131\u015f gibi g\u00f6r\u00fcn\u00fcyor.<\/p>\n<p>Helsinki \u00dcniversitesi\u2019nde evrimsel paleontolog olarak \u00e7al\u0131\u015fan Mikael Fortelius\u2019a g\u00f6re, beyaztilki atalar\u0131n\u0131n k\u00f6kleri Tibet platolar\u0131na uzanan birka\u00e7 ikonik buzul \u00e7a\u011f\u0131 hayvan\u0131ndan sadece biri. Mamutlar ve kar leoparlar\u0131 di\u011fer ikonik canl\u0131lard\u0131r. Fortelius\u2019a g\u00f6re bu \u00e7al\u0131\u015fma \u201cTibet d\u0131\u015f\u0131\u201d hipotezini desteklemede g\u00fc\u00e7l\u00fc bir kan\u0131t olu\u015fturacakt\u0131r. Yani hayvanlar so\u011fu\u011fa ve Tibet kar\u0131na adapte olup gelen buzul \u00e7a\u011f\u0131 yayg\u0131nla\u015ft\u0131\u011f\u0131nda ya\u015fam alanlar\u0131n\u0131 da yayg\u0131nla\u015ft\u0131rabildiler.<\/p>\n<p>Ancak Stockholm\u2019de \u0130sve\u00e7 Do\u011fa Tarihi M\u00fczesi\u2019nde paleontolog olarak \u00e7al\u0131\u015fan Lars Werdelin\u2019e g\u00f6re bu iddialar \u00e7ok sa\u011flam g\u00f6z\u00fckm\u00fcyor. Zira t\u00fcm tilki t\u00fcrleri aras\u0131nda sadece bu ikisinin a\u015f\u0131r\u0131 et yiyici olmas\u0131 birbirlerinin atas\u0131 olduklar\u0131n\u0131 g\u00f6stermez diyor.<\/p>\n<p>Werdelin\u2019e g\u00f6re fosiller aras\u0131ndaki b\u00fcy\u00fck zaman fark\u0131 hangi senaryonun do\u011fru oldu\u011funu bilmemizi zorla\u015ft\u0131r\u0131yor. Filogenetik bir ili\u015fkinin tam olarak belirlenebilmesi i\u00e7in tercihen 1,5-2 milyon y\u0131ll\u0131k daha gen\u00e7 fosillere ihtiya\u00e7 var gibi duruyor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kutup tilkisi ya da beyaz tilki olarak da bilinen Vulpes lagopus\u2019un 2,6 milyon y\u0131l \u00f6nce buzul d\u00f6nemi Avrupas\u0131\u2019nda evrildi\u011fi d\u00fc\u015f\u00fcn\u00fcl\u00fcyordu. Ancak \u015fimdiki fosil kan\u0131tlar\u0131 bu hayvanlar\u0131n, so\u011fuk ve sert iklimde ya\u015fayabilmek i\u00e7in azametli Tibet b\u00f6lgesinde \u00f6n-adapte oldu\u011funu g\u00f6sterdi. California L.A Do\u011fa Tarihi M\u00fczesi\u2019nde paleontolog olarak \u00e7al\u0131\u015fan Xiaoming Wang ve arkada\u015flar\u0131 Tibet Da\u011flar\u0131\u2019na yapt\u0131klar\u0131 t\u0131rman\u0131\u015flarda deniz [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":25694,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[162,19,32],"tags":[906,200,776,907,464],"class_list":["post-11798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-125-sayi","category-bilim-gundemi","category-evrim","tag-beyaz-tilki","tag-evrim","tag-hayvanlar","tag-kutup-tilkisi","tag-paleontoloji"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/11798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/users\/42"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=11798"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/11798\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/25694"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=11798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=11798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=11798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}