Neredeyse her koala foto\u011fraf\u0131nda, bu t\u00fcyl\u00fc Avustralya keselileri bir a\u011fac\u0131n g\u00f6vdesine s\u0131k\u0131ca tutunmu\u015f halde g\u00f6r\u00fcl\u00fcr. Nihayet biliminsanlar\u0131 bunun nedenini a\u00e7\u0131\u011fa \u00e7\u0131kard\u0131: Koalalar i\u00e7in a\u011fa\u00e7 g\u00f6vdesi klima i\u015flevi g\u00f6r\u00fcyor. Avustralyal\u0131 ve Amerikal\u0131 ara\u015ft\u0131rmac\u0131lar, koalalar\u0131n a\u015f\u0131r\u0131 s\u0131caktan korunmak i\u00e7in a\u011fa\u00e7 g\u00f6vdesi arad\u0131klar\u0131n\u0131 ve bulduklar\u0131 a\u011fa\u00e7 g\u00f6vdelerine sar\u0131ld\u0131klar\u0131n\u0131 g\u00f6zlemlediler.<\/p>\n
Buras\u0131 s\u0131cak m\u0131 oluyor?<\/strong><\/p>\n Koalalar\u0131n kendilerini s\u0131caktan koruyacak bir s\u0131\u011f\u0131naklar\u0131 yoktur. Bu nedenle serinlemek i\u00e7in ba\u015fka yollar bulmalar\u0131 gerekir. Buharla\u015fmal\u0131 nefes alma denilen mekanizma yoluyla, kesik kesik nefes almalar\u0131 serinlemelerine yard\u0131mc\u0131 olur fakat ayn\u0131 zamanda su kaybettirir.<\/p>\n Koalalar\u0131n serinlemek i\u00e7in a\u011fa\u00e7lara ne kadar ba\u011f\u0131ml\u0131 oldu\u011funu g\u00f6rmek \u00fczere Melbourne \u00dcniversitesi’nden Natalie Briscoe ve di\u011fer ara\u015ft\u0131rmac\u0131lar, k\u0131\u015f ve yaz aylar\u0131 boyunca 37 koalan\u0131n a\u011fa\u00e7larla ili\u015fkisini g\u00f6zlemledi. Ayr\u0131ca ekip, a\u011fa\u00e7lar\u0131n tipleri, y\u00fckseklikleri ve yerlerini not almakla kalmay\u0131p portatif bir hava istasyonu kullanarak alan\u0131n mikroiklimini \u00f6l\u00e7t\u00fcler.<\/p>\n Biology Letters<\/em> dergisinde yay\u0131mlanan makalede ara\u015ft\u0131rmac\u0131lar, s\u0131cak d\u00f6nemlerde koalalar\u0131n havadan be\u015f derece daha serin olabilecek a\u011fa\u00e7 g\u00f6vdelerine ya da al\u00e7aktaki geni\u015f dallara sar\u0131ld\u0131klar\u0131n\u0131 belirtiyor. Ayr\u0131ca ara\u015ft\u0131rma, bo\u011fucu s\u0131caklarda koalalar\u0131n a\u011fa\u00e7lar\u0131n al\u00e7ak k\u0131s\u0131mlar\u0131n\u0131 \u0131l\u0131man havalarda oldu\u011fundan y\u00fczde 65 daha s\u0131k kulland\u0131klar\u0131n\u0131 g\u00f6steriyor.<\/p>\n Serinlemek \u00f6nemli<\/strong><\/p>\n Briscoe, “Modellememiz Avustralya’n\u0131n g\u00fcneydo\u011fusundaki tipik bir s\u0131cak g\u00fcnde so\u011fuk bir a\u011faca sar\u0131lman\u0131n, koalalar\u0131n buharla\u015fmal\u0131 serinleme yoluyla kaybetme ihtiyac\u0131 duyduklar\u0131 \u0131s\u0131y\u0131 yar\u0131ya indirdi\u011fini g\u00f6sterdi” diyor. Bu davran\u0131\u015f\u0131n ise normalden daha s\u0131cak havalarda ya da uzun s\u00fcreli istisnai s\u0131cakl\u0131klarda koalalara yard\u0131mc\u0131 oldu\u011funu belirtiyor.<\/p>\n Briscoe’ya g\u00f6re bu fazladan serinleme, ya\u015fam ile \u00f6l\u00fcm aras\u0131ndaki farka denk d\u00fc\u015f\u00fcyor olabilir \u00e7\u00fcnk\u00fc s\u0131cakl\u0131k y\u00fckseldi\u011finde a\u011fa\u00e7lara sar\u0131lmak koalalar\u0131n hayatta kalma oranlar\u0131n\u0131 art\u0131r\u0131yor. Fakat g\u00f6vdeleri en so\u011fuk olan a\u011fa\u00e7lar –Acacia mernsii<\/em> ad\u0131 verilen bir a\u011fa\u00e7 gibi- her zaman koalalar\u0131n ya\u015fam alanlar\u0131nda bulunmayabiliyor. B\u00f6yle zamanlarda serin bir a\u011fa\u00e7 aramak koalalar i\u00e7in bir araba taraf\u0131ndan \u00e7arp\u0131lma ya da bir k\u00f6pe\u011fin sald\u0131r\u0131s\u0131na u\u011frama riski bar\u0131nd\u0131r\u0131yor.<\/p>\n Leopar, ku\u015f ve hatta b\u00f6cekler gibi a\u011fa\u00e7larda ya\u015fayan di\u011fer t\u00fcrler de bu serinleme stratejisini kullan\u0131yorlar. Briscoe ve yard\u0131mc\u0131 yazarlar makaleyi, k\u00fcresel \u0131s\u0131nman\u0131n etkisiyle daha s\u0131k ve yo\u011fun ger\u00e7ekle\u015fen s\u0131cak hava dalgalar\u0131n\u0131n, serin a\u011fa\u00e7 g\u00f6vdelerini orman sakinlerinin hayatlar\u0131 i\u00e7in daha \u00f6nemli k\u0131laca\u011f\u0131n\u0131 belirterek noktal\u0131yor.<\/p>\n","protected":false},"excerpt":{"rendered":" Neredeyse her koala foto\u011fraf\u0131nda, bu t\u00fcyl\u00fc Avustralya keselileri bir a\u011fac\u0131n g\u00f6vdesine s\u0131k\u0131ca tutunmu\u015f halde g\u00f6r\u00fcl\u00fcr. Nihayet biliminsanlar\u0131 bunun nedenini a\u00e7\u0131\u011fa \u00e7\u0131kard\u0131: Koalalar i\u00e7in a\u011fa\u00e7 g\u00f6vdesi klima i\u015flevi g\u00f6r\u00fcyor. Avustralyal\u0131 ve Amerikal\u0131 ara\u015ft\u0131rmac\u0131lar, koalalar\u0131n a\u015f\u0131r\u0131 s\u0131caktan korunmak i\u00e7in a\u011fa\u00e7 g\u00f6vdesi arad\u0131klar\u0131n\u0131 ve bulduklar\u0131 a\u011fa\u00e7 g\u00f6vdelerine sar\u0131ld\u0131klar\u0131n\u0131 g\u00f6zlemlediler. Buras\u0131 s\u0131cak m\u0131 oluyor? Koalalar\u0131n kendilerini s\u0131caktan koruyacak bir […]<\/p>\n","protected":false},"author":448,"featured_media":25698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[162,19,21],"tags":[776,905],"class_list":["post-11796","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-125-sayi","category-bilim-gundemi","category-biyoloji","tag-hayvanlar","tag-koala"],"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