{"id":17,"date":"2026-06-13T10:17:45","date_gmt":"2026-06-13T08:17:45","guid":{"rendered":"https:\/\/journalofspace.com\/tr\/2026\/06\/13\/fosil-yer-sincaplari-diskilari-700-000-yillik-cevresel-tarihi-ortaya-cikariyor\/"},"modified":"2026-06-13T10:19:52","modified_gmt":"2026-06-13T08:19:52","slug":"fosil-yer-sincaplari-diskilari-700-000-yillik-cevresel-tarihi-ortaya-cikariyor","status":"publish","type":"post","link":"https:\/\/journalofspace.com\/tr\/2026\/06\/13\/fosil-yer-sincaplari-diskilari-700-000-yillik-cevresel-tarihi-ortaya-cikariyor\/","title":{"rendered":"Fosil yer sincaplar\u0131 d\u0131\u015fk\u0131lar\u0131, 700.000 y\u0131ll\u0131k \u00e7evresel tarihi ortaya \u00e7\u0131kar\u0131yor"},"content":{"rendered":"

“`html<\/p>\n

Fosil yer sincaplar\u0131 d\u0131\u015fk\u0131lar\u0131, 700.000 y\u0131ll\u0131k \u00e7evresel tarihi ortaya \u00e7\u0131kar\u0131yor<\/h1>\n

Kanada\u2019n\u0131n Yukon b\u00f6lgesindeki permafrostta korunmu\u015f yer sincaplar\u0131 yuvalar\u0131, y\u00fcz binlerce y\u0131l \u00f6ncesine ait fosil d\u0131\u015fk\u0131lar i\u00e7eriyor. Koprolit ad\u0131 verilen bu kal\u0131nt\u0131lar, eski \u00e7evresel DNA\u2019ya e\u015fsiz bir eri\u015fim sa\u011flayarak, ge\u00e7mi\u015f ekosistemleri daha \u00f6nce g\u00f6r\u00fclmemi\u015f bir hassasiyetle yeniden in\u015fa etme olana\u011f\u0131 sunuyor. Genetik analizler, mamut bozk\u0131rlar\u0131na \u00f6zg\u00fc bitkiler, b\u00f6cekler, mikroplar ve hatta b\u00fcy\u00fck memelilerin varl\u0131\u011f\u0131n\u0131 ortaya \u00e7\u0131kard\u0131. En dikkat \u00e7ekici bulgular aras\u0131nda, bozk\u0131r bizonu, at ve y\u00fcnl\u00fc mamut gibi simgesel t\u00fcrlerin tam mitokondriyal genomlar\u0131 yer al\u0131yor.<\/p>\n

Bu d\u0131\u015fk\u0131lar ayr\u0131ca, 700.000 y\u0131l \u00f6ncesine dayanan ve g\u00fcn\u00fcm\u00fczdeki bir\u00e7ok grubun ayr\u0131\u015fmas\u0131ndan \u00f6nce var olan bilinmeyen bir Arktik yer sincab\u0131 soyunu ortaya \u00e7\u0131kard\u0131. Bu ke\u015fif, a\u015f\u0131r\u0131 Arktik ko\u015fullar\u0131na uyum sa\u011flam\u0131\u015f bu kemirgenlerde \u015fa\u015f\u0131rt\u0131c\u0131 bir genetik \u00e7e\u015fitlilik oldu\u011funu d\u00fc\u015f\u00fcnd\u00fcr\u00fcyor. Ger\u00e7ekten de yer sincaplar\u0131, v\u00fccut s\u0131cakl\u0131klar\u0131n\u0131 s\u0131f\u0131r\u0131n alt\u0131na d\u00fc\u015f\u00fcrerek ve kalp at\u0131\u015f h\u0131zlar\u0131n\u0131 dakikada sadece bir at\u0131\u015fa indirerek aylarca k\u0131\u015f uykusuna yatarlar; bu, hayvanlar aleminde e\u015fsiz bir hayatta kalma stratejisidir.<\/p>\n

Koprolitler, \u00f6karyotik DNA\u2019y\u0131, genellikle kemikler veya tortulardan daha iyi koruma kapasitelerine sahiptir. Ara\u015ft\u0131rmac\u0131lar, eski DNA\u2019n\u0131n otantikli\u011fini, karakteristik bozunma modelleri, s\u0131k\u0131 pozitif ve negatif kontroller ve bilgisayar sim\u00fclasyonlar\u0131yla yap\u0131lan taksonomik do\u011frulamalar sayesinde teyit edebildiler. Beklenenin aksine, d\u0131\u015far\u0131dan gelen malzemelerle \u00e7ok az kirlenme g\u00f6zlemlendi; bu da bu d\u0131\u015fk\u0131lar\u0131n biyolojik zaman kaps\u00fcllerine benzeyen s\u0131zd\u0131rmaz yap\u0131lar oldu\u011funu kan\u0131tl\u0131yor.<\/p>\n

Bu \u00f6rneklerden yeniden in\u015fa edilen ekosistemler, Pleistosen d\u00f6neminde bug\u00fcn yok olmu\u015f bir fauna ve floraya ev sahipli\u011fi yapan Do\u011fu Beringia b\u00f6lgesine ait. Hakim bitkiler aras\u0131nda otlar, s\u00f6\u011f\u00fctler ve kanyonsu otlar\u0131 yer al\u0131rken, hayvanlar aras\u0131nda mamutlar, bizonlar, atlar ve ayr\u0131ca Amerikan aslanlar\u0131 veya Amerika \u00e7italar\u0131 gibi bug\u00fcn nesli t\u00fckenmi\u015f y\u0131rt\u0131c\u0131 hayvanlar bulunuyordu. Koprolitler, hatta nematodlar gibi parazitlerin izlerini de ortaya \u00e7\u0131kard\u0131 ve karma\u015f\u0131k ekolojik etkile\u015fimleri g\u00fcn \u0131\u015f\u0131\u011f\u0131na \u00e7\u0131kard\u0131.<\/p>\n

\u00c7al\u0131\u015fma, paleogenomik alan\u0131nda genellikle ihmal edilen yer sincaplar\u0131 yuvalar\u0131n\u0131n, Kuaterner d\u00f6neminin ekolojik ve evrimsel dinamiklerini anlamak i\u00e7in e\u015fsiz bir kaynak oldu\u011funu g\u00f6steriyor. Analizleri, iklim de\u011fi\u015fikliklerine kar\u015f\u0131 t\u00fcrlerin uyum sa\u011flama bi\u00e7imlar\u0131na dair anlay\u0131\u015f\u0131m\u0131z\u0131 devrim niteli\u011finde de\u011fi\u015ftirebilir ve gelece\u011fe de\u011ferli dersler sunabilir. Ara\u015ft\u0131rmac\u0131lar, permafrostta korunmu\u015f bu do\u011fal ar\u015fivlerin, prehistorik ya\u015fam hakk\u0131nda hala bir\u00e7ok s\u0131r bar\u0131nd\u0131rabilece\u011fini vurguluyor.<\/p>\n

“`<\/p>\n

\n

Sources officielles<\/h2>\n

\u00c9tude de r\u00e9f\u00e9rence<\/h3>\n

DOI\u00a0:<\/strong> https:\/\/doi.org\/10.1038\/s41467-026-72977-6<\/a><\/p>\n

Titre\u00a0:<\/strong> Ground squirrel coprolites preserve complex archives of ancient environmental DNA over 700,000 years<\/p>\n

Revue : <\/strong> Nature Communications<\/p>\n

\u00c9diteur : <\/strong> Springer Science and Business Media LLC<\/p>\n

Auteurs : <\/strong> Tyler J. Murchie; Scott L. Cocker; Sina Baleka; Nicola Alexandra Vogel; Libby Natola; Emil Karpinski; Diana Tirlea; McIntyre A. Barrera; Danielle M. Grant; Evan Morien; George S. Long; Linda Y. Rutledge; Grant D. Zazula; Britta J. Jensen; Duane G. Froese; Hendrik N. Poinar<\/p>\n","protected":false},"excerpt":{"rendered":"

“`html Fosil yer sincaplar\u0131 d\u0131\u015fk\u0131lar\u0131, 700.000 y\u0131ll\u0131k \u00e7evresel tarihi ortaya \u00e7\u0131kar\u0131yor Kanada\u2019n\u0131n Yukon b\u00f6lgesindeki permafrostta korunmu\u015f yer sincaplar\u0131 yuvalar\u0131, y\u00fcz binlerce y\u0131l \u00f6ncesine ait fosil d\u0131\u015fk\u0131lar i\u00e7eriyor. Koprolit ad\u0131 verilen bu kal\u0131nt\u0131lar, eski \u00e7evresel DNA\u2019ya e\u015fsiz bir eri\u015fim sa\u011flayarak, ge\u00e7mi\u015f ekosistemleri daha \u00f6nce g\u00f6r\u00fclmemi\u015f bir hassasiyetle yeniden in\u015fa etme olana\u011f\u0131 sunuyor. Genetik analizler, mamut bozk\u0131rlar\u0131na… Okumaya devam et Fosil yer sincaplar\u0131 d\u0131\u015fk\u0131lar\u0131, 700.000 y\u0131ll\u0131k \u00e7evresel tarihi ortaya \u00e7\u0131kar\u0131yor<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[],"class_list":["post-17","post","type-post","status-publish","format-standard","hentry","category-cevre","category-uluslararasi","entry"],"_links":{"self":[{"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/posts\/17","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/comments?post=17"}],"version-history":[{"count":1,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/posts\/17\/revisions"}],"predecessor-version":[{"id":18,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/posts\/17\/revisions\/18"}],"wp:attachment":[{"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/media?parent=17"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/categories?post=17"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/journalofspace.com\/tr\/wp-json\/wp\/v2\/tags?post=17"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}