Kambriyen Patlamas\u0131n\u0131 duymu\u015fsunuzdur. 540 milyon y\u0131l \u00f6nce basit hayvan formlar\u0131n\u0131n ilk olarak g\u00f6r\u00fcld\u00fc\u011f\u00fc zaman olan Kambriyen ve tabii ki 65 milyon y\u0131l \u00f6nce ya\u015fayan dinozorlar\u0131n d\u00f6nemi d\u00fcnya tiyatrosunda \u00e7ok \u00f6nemli iki sahnedir. Peki ya Ordovisien d\u00f6nemini ne kadar biliyoruz? Kambriyen\u2019den sonra g\u00f6r\u00fclen Ordovisien d\u00f6nemi (495 my\u00f6 -440 my\u00f6), deniz taban\u0131nda sessizce ya\u015fayan belki de d\u00f6nemine g\u00f6re pek de ilgi \u00e7ekmeyen canl\u0131lar\u0131n say\u0131lar\u0131nda b\u00fcy\u00fck bir patlama olan bir s\u00fcre\u00e7tir. Bununla beraber evrimsel farkl\u0131la\u015fman\u0131n en b\u00fcy\u00fck patlamas\u0131 olarak kabul edilir.<\/p>\n
Aral\u0131k ay\u0131 i\u00e7inde jeolog ve paleantologlardan olu\u015fan bir grup ara\u015ft\u0131r\u0131c\u0131, Ordovisien d\u00f6neminin ba\u015flad\u0131\u011f\u0131 d\u00f6nemde, d\u00fcnyan\u0131n asteroit ya\u011fmuruna maruz kald\u0131\u011f\u0131n\u0131 a\u00e7\u0131klad\u0131.<\/p>\n
Amsterdam Free \u00dcniversitesi\u2019nden Paleantolog Jan Schmitz, Ordovisien d\u00f6neminde g\u00f6r\u00fclen asteroit tesad\u00fcf\u00fcn\u00fc biyolojik \u00e7e\u015fitlilik a\u00e7\u0131s\u0131ndan gayet olumlu g\u00f6rmekte. O\u2019na g\u00f6re as\u0131l soru \u015fu: Asteroit ya\u011fmuru ile \u00e7e\u015fitlili\u011fin art\u0131\u015f\u0131n\u0131 nas\u0131l ba\u015flatabilirsiniz? \u0130sve\u00e7 Lund \u00dcniversitesi\u2019nden Jeolog Birger Schmitz ve arkada\u015flar\u0131na g\u00f6re, asteroit ku\u015fa\u011f\u0131ndaki b\u00fcy\u00fck asteroitler d\u00fcnyaya \u00e7arpt\u0131klar\u0131nda k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6l\u00fcnd\u00fcler ve par\u00e7alanma sonras\u0131nda her bir par\u00e7a 100 kat daha b\u00fcy\u00fck bir par\u00e7an\u0131n etkisini g\u00f6sterdi.<\/p>\n
Nature Geoscience<\/em>\u2019\u0131n Aral\u0131k say\u0131s\u0131nda Schmitz ve arkada\u015flar\u0131 Ordovisien d\u00f6neminde g\u00f6r\u00fclen asteroit ya\u011fmurunun kal\u0131nt\u0131lar\u0131na ait bulgular\u0131 yay\u0131nlad\u0131lar. \u00c7in ve \u0130sve\u00e7\u2019te bulunan iki \u00f6rnek, Osmiyum izotoplar\u0131yla analiz edildi. Bulgular, her iki \u00f6rne\u011fin ayn\u0131 ya\u015fta oldu\u011funu ve asteroit ya\u011fmuru ile biyolojik \u00e7e\u015fitlili\u011fin tesad\u00fcfen \u00f6rt\u00fc\u015ft\u00fc\u011f\u00fcn\u00fc g\u00f6sterdi. Bu durumu brachiopod -dall\u0131 bacakl\u0131lar; iki sert kabu\u011fa sahip deniz omurgas\u0131zlar\u0131- t\u00fcrleri ile familyalar\u0131ndaki art\u0131\u015f ve kayalar\u0131n birka\u00e7 desimetre i\u00e7indeki Osmiyum izotop oran\u0131n\u0131n artmas\u0131n\u0131 g\u00f6stererek ispatlad\u0131lar.<\/p>\n Schmitz elde etti\u011fi bulgulardan cesaret alarak, asteroit ya\u011fmurunun Kambriyen d\u00f6neminden kalma brachiopod ve trilobitler gibi hareketsiz canl\u0131lar i\u00e7in bir avantaj oldu\u011funu ve bunun ya\u011fmurla olu\u015fan yeni ekolojik b\u00f6lgeler sayesinde sa\u011fland\u0131\u011f\u0131n\u0131 ifade etti. Bununla beraber bulgular\u0131n, dinozorlar\u0131n yok olmas\u0131 hakk\u0131nda yap\u0131lan tart\u0131\u015fmalara da yeni boyutlar kataca\u011f\u0131 d\u00fc\u015f\u00fcn\u00fclmektedir.<\/p>\n","protected":false},"excerpt":{"rendered":" Kambriyen Patlamas\u0131n\u0131 duymu\u015fsunuzdur. 540 milyon y\u0131l \u00f6nce basit hayvan formlar\u0131n\u0131n ilk olarak g\u00f6r\u00fcld\u00fc\u011f\u00fc zaman olan Kambriyen ve tabii ki 65 milyon y\u0131l \u00f6nce ya\u015fayan dinozorlar\u0131n d\u00f6nemi d\u00fcnya tiyatrosunda \u00e7ok \u00f6nemli iki sahnedir. Peki ya Ordovisien d\u00f6nemini ne kadar biliyoruz? Kambriyen\u2019den sonra g\u00f6r\u00fclen Ordovisien d\u00f6nemi (495 my\u00f6 -440 my\u00f6), deniz taban\u0131nda sessizce ya\u015fayan belki de d\u00f6nemine […]<\/p>\n","protected":false},"author":472,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[85,32,23,222],"tags":[197,199,200,315,496,238],"class_list":["post-8657","post","type-post","status-publish","format-standard","hentry","category-47-sayi","category-evrim","category-iklim","category-tarih","tag-biyoloji","tag-ekoloji","tag-evrim","tag-jeoloji","tag-kambriyen-patlamasi","tag-tarih"],"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