{"id":43690,"date":"2012-03-01T12:50:29","date_gmt":"2012-03-01T10:50:29","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=43690"},"modified":"2020-05-07T12:54:21","modified_gmt":"2020-05-07T09:54:21","slug":"fareden-file-sadece-24-milyon-nesil-bekleyin","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2012\/03\/01\/fareden-file-sadece-24-milyon-nesil-bekleyin","title":{"rendered":"Fareden file? Sadece 24 milyon nesil bekleyin\u2026"},"content":{"rendered":"

Haz\u0131rlayan: Tu\u011f\u00e7e \u00d6n\u00fcr<\/strong> \/ \u0130T\u00dc Molek\u00fcler Biyoloji ve Genetik Lisans \u00d6\u011frencisi<\/p>\n

Bilimciler b\u00fcy\u00fck \u00f6l\u00e7ekte evrimin ne kadar h\u0131zl\u0131 olabilece\u011fini ilk kez \u00f6l\u00e7t\u00fc ve ara\u015ft\u0131rmalar g\u00f6steriyor ki fare boyutundaki bir hayvan\u0131n fil boyutuna ula\u015fabilmesi 24 milyon nesil al\u0131yor.<\/p>\n

Ulusal Bilimler Akademisi Tutanaklar\u0131nda (Proceedings of the National Academy of Sciences)<\/em> yay\u0131nlanan ara\u015ft\u0131rma 65 milyon y\u0131l \u00f6ncesinde dinozorlar\u0131n yok olu\u015flar\u0131ndan bu yana memelilerin boyutlar\u0131ndaki art\u0131\u015f ve azal\u0131\u015f\u0131 a\u00e7\u0131kl\u0131yor.<\/p>\n

Dr. Alistair Evans ve 20 ki\u015filik biyolog ve paleontologdan olu\u015fan ekip boyutsal azalma h\u0131z\u0131n\u0131n b\u00fcy\u00fcme h\u0131z\u0131ndan \u00e7ok daha fazla oldu\u011funu ke\u015ffetti. \u00c7ok b\u00fcy\u00fck azalmalar sadece 100.000 nesil al\u0131yor ve c\u00fcceli\u011fin olu\u015fmas\u0131na yol a\u00e7\u0131yor.<\/p>\n

Dr. Evans, en son \u00e7al\u0131\u015fman\u0131n mikro evrime (bir t\u00fcr i\u00e7inde meydana gelen k\u00fc\u00e7\u00fck de\u011fi\u015fikliklere) y\u00f6nelik oldu\u011funu bu y\u00fczden de bu \u00e7al\u0131\u015fman\u0131n e\u015fsiz oldu\u011funu s\u00f6yledi.<\/p>\n

Ayr\u0131ca Dr. Evans, \u201cV\u00fccut b\u00fcy\u00fckl\u00fc\u011f\u00fcndeki b\u00fcy\u00fck de\u011fi\u015fikliklere odakland\u0131k ve \u015funu s\u00f6yleyebiliriz ki fareden file boyut de\u011fi\u015fimi (k\u00fctlesel de\u011fi\u015fim) 24 milyon nesil al\u0131r. Bu da \u00e7ok uzun bir zaman dilimi. Tav\u015fandan file boyut de\u011fi\u015fimi ise 10 milyon nesil al\u0131r.\u201d diye ekledi.<\/p>\n

Son 70 milyon y\u0131l i\u00e7inde \u00e7e\u015fitli k\u0131ta ve okyanus havzalar\u0131ndan elde edilen \u00f6rneklerle primat, balina ve filin de i\u00e7inde bulundu\u011fu 28 farkl\u0131 grup memeli incelendi.<\/p>\n

Boyutsal de\u011fi\u015fimin y\u0131l olarak de\u011fil nesiller boyunca izlenmesi ya\u015fam s\u00fcresi farkl\u0131 olan t\u00fcrlerin kar\u015f\u0131la\u015ft\u0131rmas\u0131 i\u00e7in daha avantajl\u0131d\u0131r.<\/p>\n

Dr. Erich Fitzgerald, balina boyutundaki de\u011fi\u015fimin toprak memelilerine g\u00f6re iki kat daha h\u0131zl\u0131 oldu\u011funu s\u00f6yl\u00fcyor. Bunun da suda b\u00fcy\u00fcmenin daha kolay olmas\u0131ndan ve suyun a\u011f\u0131rl\u0131\u011f\u0131 ta\u015f\u0131maya yard\u0131mc\u0131 olmas\u0131ndan kaynaklanabilece\u011fini ekliyor.<\/p>\n

Dr. Evans v\u00fccut b\u00fcy\u00fckl\u00fc\u011f\u00fcndeki azal\u0131\u015f\u0131n art\u0131\u015ftan 10 kat daha h\u0131zl\u0131 oldu\u011funu bulmalar\u0131n\u0131n \u015fa\u015f\u0131rt\u0131c\u0131 oldu\u011funu vurguluyor. \u201cK\u00fc\u00e7\u00fclme ve b\u00fcy\u00fcme h\u0131zlar\u0131ndaki b\u00fcy\u00fck de\u011fi\u015fiklik hayret verici. Biz bu kadar h\u0131zl\u0131 oldu\u011funu asla tahmin etmiyorduk\u201d diyor.<\/p>\n

Adada ya\u015fayan Pigme mamut, c\u00fcce hipopotam ve hobbit insan\u0131 gibi baz\u0131 k\u00fc\u00e7\u00fck hayvanlar boyutsal k\u00fc\u00e7\u00fclmenin anla\u015f\u0131lmas\u0131nda yard\u0131mc\u0131 oldu.<\/p>\n

Dr. Evans \u201cE\u011fer k\u00fc\u00e7\u00fck boyuttaysan\u0131z daha az besine ihtiya\u00e7 duyars\u0131n\u0131z ve daha h\u0131zl\u0131 \u00e7o\u011fal\u0131rs\u0131n\u0131z. Bunlar k\u00fc\u00e7\u00fck adalar i\u00e7in \u00f6nemli avantajlar.\u201d diyor.<\/p>\n

Bu ara\u015ft\u0131rma, baz\u0131 memelilerin geli\u015fmesi ve daha fazla b\u00fcy\u00fcmesi ya da t\u00fcrlerin yok olma potansiyeli ve art\u0131\u015f h\u0131zlar\u0131n\u0131n yava\u015flamas\u0131 i\u00e7in uygun ortamlar\u0131n anla\u015f\u0131lmas\u0131n\u0131 sa\u011flayacak.<\/p>\n

Kaynak:<\/strong>13.02.2012 tarihinde http:\/\/www.sciencedaily.com\/releases\/2012\/01\/120130171909.htm adresinden al\u0131nm\u0131\u015ft\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"

Haz\u0131rlayan: Tu\u011f\u00e7e \u00d6n\u00fcr \/ \u0130T\u00dc Molek\u00fcler Biyoloji ve Genetik Lisans \u00d6\u011frencisi Bilimciler b\u00fcy\u00fck \u00f6l\u00e7ekte evrimin ne kadar h\u0131zl\u0131 olabilece\u011fini ilk kez \u00f6l\u00e7t\u00fc ve ara\u015ft\u0131rmalar g\u00f6steriyor ki fare boyutundaki bir hayvan\u0131n fil boyutuna ula\u015fabilmesi 24 milyon nesil al\u0131yor. Ulusal Bilimler Akademisi Tutanaklar\u0131nda (Proceedings of the National Academy of Sciences) yay\u0131nlanan ara\u015ft\u0131rma 65 milyon y\u0131l \u00f6ncesinde dinozorlar\u0131n […]<\/p>\n","protected":false},"author":429,"featured_media":43692,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[134,38,32],"tags":[6539,200,1115,950,6195],"class_list":["post-43690","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-97-sayi","category-dergi-sayilari","category-evrim","tag-alistair-evans","tag-evrim","tag-fare","tag-fil","tag-nesil"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t