British Columbia \u00dcniversitesi\u2019nden ara\u015ft\u0131rmac\u0131lar, vah\u015fi ya\u015famda \u015fimdiye kadar kaydedilen en h\u0131zl\u0131 evrimsel tepkilerden birini g\u00f6zlemlediler. Diken (stickleback) bal\u0131\u011f\u0131, \u00fc\u00e7 y\u0131l i\u00e7inde, kendi atalar\u0131na g\u00f6re su s\u0131cakl\u0131\u011f\u0131na kar\u015f\u0131 2,5 santigrat derece tolerans geli\u015ftirdi.<\/p>\n
Proceedings of the Royal Society B <\/em>dergisinin son say\u0131s\u0131nda yay\u0131nlanan \u00e7al\u0131\u015fma, evrimin pop\u00fclasyonlar\u0131n iklimsel de\u011fi\u015fikliklerde hayatta kalmas\u0131na yard\u0131m etti\u011fini g\u00f6steren ilk deneysel kan\u0131ta yer verdi. <\/em><\/p>\n Ge\u00e7en buzul \u00e7a\u011f\u0131n\u0131 takiben okyanustan k\u00f6ken alan diken bal\u0131\u011f\u0131, tatl\u0131 su g\u00f6llerine ve akarsulara yerle\u015fmeye ba\u015flad\u0131. Ge\u00e7en 10.000 y\u0131ldan daha uzun bir s\u00fcrede, deniz ve tatl\u0131 su diken bal\u0131klar\u0131, onlar\u0131 Darwin\u2019in do\u011fal se\u00e7ilim teorisine model yapan farkl\u0131 fiziksel ve davran\u0131\u015fsal \u00f6zelliklere do\u011fru de\u011fi\u015fim ge\u00e7irdiler.<\/p>\n UBC Department of Zoolog b\u00f6l\u00fcm\u00fcnden yazar Rowan Barrett \u201cVah\u015fi ya\u015famdaki ve laboratuvar ortam\u0131ndaki diken bal\u0131klar\u0131n\u0131n s\u0131cakl\u0131k dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 test ederek, tatl\u0131 su diken bal\u0131klar\u0131n\u0131n denizde ya\u015fayan \u00f6rneklerine g\u00f6re daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klara dayanabildi\u011fini bulduk.\u201d a\u00e7\u0131klamas\u0131n\u0131 yapt\u0131. Barrett, \u201cBu durum evrimsel bak\u0131\u015f a\u00e7\u0131s\u0131na g\u00f6re mant\u0131kl\u0131yd\u0131, \u00e7\u00fcnk\u00fc atalar\u0131 okyanustan daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klara ula\u015fan tatl\u0131 su g\u00f6llerine adapte olabiliyordu.\u201d dedi.<\/p>\n Bu adaptasyonun nas\u0131l bu kadar h\u0131zla meydana geldi\u011fini \u00f6\u011frenmek i\u00e7in, Barrett ile \u0130svi\u00e7re ve \u0130sve\u00e7\u2019ten \u00e7al\u0131\u015fma arkada\u015flar\u0131, deniz diken bal\u0131klar\u0131n\u0131 tatl\u0131 su havuzlar\u0131na aktararak tarihi yeniden yaratt\u0131lar ve en az \u00fc\u00e7 nesilde (ya da \u00fc\u00e7 y\u0131l), bu bal\u0131klar\u0131n tatl\u0131 su diken bal\u0131klar\u0131 gibi atalar\u0131ndan 2,5o<\/sup>C daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klara dayanabildiklerini buldular.<\/p>\n Ge\u00e7ti\u011fimiz hafta doktora derecesini alan Barrett; \u201c\u00c7al\u0131\u015fmam\u0131z deneysel olarak baz\u0131 t\u00fcrlerin vah\u015fi ya\u015famda hava de\u011fi\u015fikliklerine h\u0131zla adapte oldu\u011funu g\u00f6steren ilk \u00e7al\u0131\u015fmad\u0131r.\u00a0 Bununla birlikte, bu h\u0131zl\u0131 adaptasyon bir bedel olmadan m\u00fcmk\u00fcn de\u011fildir.\u00a0 Sadece s\u0131cakl\u0131ktaki h\u0131zl\u0131 de\u011fi\u015fiklikleri tolere edebilen canl\u0131lar hayatta kal\u0131rken, hayatta kalanlar\u0131n sadece bir k\u0131sm\u0131 pop\u00fclasyonu devam ettirebilmektedir. Evrimsel i\u015fleyi\u015fin koruma ve y\u00f6netim politikas\u0131na dahil olmas\u0131 olduk\u00e7a \u00f6nemlidir.\u201d<\/p>\n Kaynak:<\/strong> \u201cTiny Fish Evolved to Tolerate Colder Temperature in Three Years, Study Finds\u201d\u00a0 http:\/\/www.sciencedaily.com\/releases\/2010\/08\/100804133446.htm, 09.08.2010 tarihinde \u00e7evrilmi\u015ftir.<\/p>\n","protected":false},"excerpt":{"rendered":" British Columbia \u00dcniversitesi\u2019nden ara\u015ft\u0131rmac\u0131lar, vah\u015fi ya\u015famda \u015fimdiye kadar kaydedilen en h\u0131zl\u0131 evrimsel tepkilerden birini g\u00f6zlemlediler. Diken (stickleback) bal\u0131\u011f\u0131, \u00fc\u00e7 y\u0131l i\u00e7inde, kendi atalar\u0131na g\u00f6re su s\u0131cakl\u0131\u011f\u0131na kar\u015f\u0131 2,5 santigrat derece tolerans geli\u015ftirdi. Proceedings of the Royal Society B dergisinin son say\u0131s\u0131nda yay\u0131nlanan \u00e7al\u0131\u015fma, evrimin pop\u00fclasyonlar\u0131n iklimsel de\u011fi\u015fikliklerde hayatta kalmas\u0131na yard\u0131m etti\u011fini g\u00f6steren ilk deneysel kan\u0131ta […]<\/p>\n","protected":false},"author":801,"featured_media":48627,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116,38],"tags":[4017,7312,200,1785,7313],"class_list":["post-48626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-79-sayi","category-dergi-sayilari","tag-charles-darwin","tag-diken-baliklari","tag-evrim","tag-populasyon","tag-stickleback-fish"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/48626","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\/801"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=48626"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/48626\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/48627"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=48626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=48626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=48626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}