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Denizlerin s\u0131\u011f sular\u0131ndan 6 bin metre derinli\u011fe kadar olan b\u00f6lgede ya\u015famaya adapte olan denizy\u0131ld\u0131zlar\u0131 bildi\u011fimiz t\u00fcm ya\u015fam formlar\u0131ndan farkl\u0131 \u00f6zellikleri ile su alt\u0131 d\u00fcnyas\u0131n\u0131n gizemli canl\u0131lar\u0131 aras\u0131nda yer al\u0131yor. Yakla\u015f\u0131k 2 bin t\u00fcr\u00fc bulunan denizy\u0131ld\u0131zlar\u0131 hakk\u0131ndaki ilgin\u00e7 bilgileri yaz\u0131m\u0131zda listeledik.<\/p>\n
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Denizy\u0131ld\u0131zlar\u0131 hakk\u0131nda bulunan en eski fosil kay\u0131tlar\u0131 yakla\u015f\u0131k 450 milyon y\u0131l \u00f6ncesine aittir. S\u0131cak denizlerden so\u011fuk kutup denizine kadar ya\u015fam alan\u0131na sahip olsalar da tatl\u0131 suda ya\u015fayamayan denizy\u0131ld\u0131zlar\u0131n\u0131n ya\u015fam s\u00fcresi 35 senedir. En b\u00fcy\u00fck t\u00fcr\u00fcn\u00fcn \u00e7ap\u0131 bir metre, a\u011f\u0131rl\u0131\u011f\u0131 da be\u015f kilograma ula\u015fabilir.<\/p>\n
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Denizy\u0131ld\u0131z\u0131n\u0131n en etkileyici \u00f6zelli\u011fi v\u00fccutlar\u0131n\u0131n kopan k\u0131s\u0131mlar\u0131n\u0131 yenileyebilmesidir. Bir avc\u0131, denizy\u0131ld\u0131z\u0131n\u0131n bir k\u0131sm\u0131n\u0131 yedi\u011finde kalan eksik k\u0131s\u0131m bir s\u00fcre sonra eski haline geri gelir. Denizy\u0131ld\u0131z\u0131n\u0131n bu becerisine \u201crejenerasyon\u201d yani \u201cyenilenme\u201d \u00f6zelli\u011fi denir ve bu s\u00fcre\u00e7 bir y\u0131l kadar s\u00fcrebilir.<\/p>\n
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Denizy\u0131ld\u0131zlar\u0131 \u00e7o\u011funlukla salyangoz, k\u00fc\u00e7\u00fck bal\u0131k, istiridye ya da midye ile beslense de su yosunlar\u0131 ile ya\u015fam\u0131n\u0131 s\u00fcrd\u00fcren ot\u00e7ul t\u00fcrleri de vard\u0131r. Midelerini d\u0131\u015far\u0131ya \u00e7\u0131kartarak g\u00f6vdelerinin d\u0131\u015f\u0131nda da sindirim yapabilir, bu sayede kendilerinden daha b\u00fcy\u00fck canl\u0131larla da beslenebilir.<\/p>\n
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Denizanas\u0131 gibi denizy\u0131ld\u0131zlar\u0131n\u0131n da ne kan\u0131 ne de beyni vard\u0131r. Beyinlerinin yerine sahip olduklar\u0131 \u015fey karma\u015f\u0131k bir sinir sistemidir. N\u00f6ronlar\u0131 sinir u\u00e7lar\u0131yla mesaj iletimi yaparak sinir sistemlerinin devaml\u0131l\u0131\u011f\u0131n\u0131 sa\u011flar. Bunun yan\u0131nda tehlikeleri hissedebilen g\u00fc\u00e7l\u00fc i\u00e7g\u00fcd\u00fcleri vard\u0131r. Deniz suyu, bir denizy\u0131ld\u0131z\u0131 i\u00e7in gerekli olan t\u00fcm besini sa\u011flar. Bu y\u00fczden besinlerin dola\u015ft\u0131\u011f\u0131 bir kalp veya kanlar\u0131 olmad\u0131\u011f\u0131 i\u00e7in dola\u015f\u0131m sistemi de yoktur. Sadece onlar\u0131 hayatta tutmak i\u00e7in dola\u015f\u0131m sistemini taklit eden su dolu v\u00fccutlar\u0131 bulunur.<\/p>\n
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Denizy\u0131ld\u0131zlar\u0131 boyut, \u015fekil ve renk olarak birbirinden farkl\u0131d\u0131r. Bu canl\u0131lar\u0131n en dikkat \u00e7ekici \u00f6zelliklerinden biri de kollar\u0131d\u0131r. Bir\u00e7ok denizy\u0131ld\u0131z\u0131 t\u00fcr\u00fcnde be\u015f kol vard\u0131r ancak g\u00fcne\u015f y\u0131ld\u0131z\u0131 gibi baz\u0131 t\u00fcrlerde kol say\u0131s\u0131 k\u0131rka kadar \u00e7\u0131kabilir. Mesela; Avrupa denizy\u0131ld\u0131z\u0131nda 12, Amerikan denizy\u0131ld\u0131z\u0131nda 40 kol vard\u0131r. Kollar\u0131n her biri midye, istiridye gibi hayvanlar\u0131n kabu\u011funu ay\u0131rabilecek kadar g\u00fc\u00e7l\u00fcd\u00fcr.<\/p>\n
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Bir denizy\u0131ld\u0131z\u0131, ayr\u0131nt\u0131lar\u0131 fazla g\u00f6remeyen ancak ayd\u0131nl\u0131\u011f\u0131 ve karanl\u0131\u011f\u0131 fark edebilen g\u00f6z noktalar\u0131na sahiptir; bu g\u00f6z noktalar\u0131 denizy\u0131ld\u0131z\u0131n\u0131n her kolunun ucunda bulunur. G\u00f6zleri de san\u0131lan\u0131n aksine v\u00fccutlar\u0131n\u0131n orta k\u0131sm\u0131nda de\u011fildir.<\/p>\n
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Ku\u015f ve bal\u0131k gibi avc\u0131lardan korunmak i\u00e7in baz\u0131 denizy\u0131ld\u0131z\u0131 t\u00fcr\u00fcnde dikenler vard\u0131r. Kimi t\u00fcrleri ise insan gibi avc\u0131lardan korunmak i\u00e7in tehlike an\u0131nda k\u00f6t\u00fc koku salg\u0131lama yetene\u011fine sahiptir.<\/p>\n
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[vc_row][vc_column][vc_column_text] Denizlerin s\u0131\u011f sular\u0131ndan 6 bin metre derinli\u011fe kadar olan b\u00f6lgede ya\u015famaya adapte olan denizy\u0131ld\u0131zlar\u0131 bildi\u011fimiz t\u00fcm ya\u015fam formlar\u0131ndan farkl\u0131 \u00f6zellikleri ile su alt\u0131 d\u00fcnyas\u0131n\u0131n gizemli canl\u0131lar\u0131 aras\u0131nda yer al\u0131yor. Yakla\u015f\u0131k 2 bin t\u00fcr\u00fc bulunan denizy\u0131ld\u0131zlar\u0131 hakk\u0131ndaki ilgin\u00e7 bilgileri yaz\u0131m\u0131zda listeledik. [\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”innerItemContainer”][vc_column][eltd_section_title alignment=”left” title=”1#” title_font_size=”13″][vc_single_image image=”28343″ img_size=”full” el_class=”innerImageContainer”][vc_column_text el_class=”innerText”] Denizy\u0131ld\u0131zlar\u0131 hakk\u0131nda bulunan en eski […]<\/p>\n","protected":false},"author":1,"featured_media":28342,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[1823],"class_list":["post-28341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rota-doga","tag-denizyildizi"],"_links":{"self":[{"href":"https:\/\/soms.invekor.net\/index.php?rest_route=\/wp\/v2\/posts\/28341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/soms.invekor.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/soms.invekor.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/soms.invekor.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/soms.invekor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=28341"}],"version-history":[{"count":0,"href":"https:\/\/soms.invekor.net\/index.php?rest_route=\/wp\/v2\/posts\/28341\/revisions"}],"wp:attachment":[{"href":"https:\/\/soms.invekor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/soms.invekor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/soms.invekor.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}