{"id":15759,"date":"2021-09-13T14:47:00","date_gmt":"2021-09-13T14:47:00","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=15759"},"modified":"2021-09-13T14:47:00","modified_gmt":"2021-09-13T14:47:00","slug":"shark-teeth-reveal-secrets-brazils-changing-ocean-ecosystem","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/hu\/science\/marine-biology\/shark-teeth-reveal-secrets-brazils-changing-ocean-ecosystem\/","title":{"rendered":"C\u00e1pafogak fedik fel Braz\u00edlia \u00f3ce\u00e1ni \u00f6kosziszt\u00e9m\u00e1j\u00e1nak v\u00e1ltoz\u00e1sait"},"content":{"rendered":"

C\u00e1pafogak fedik fel Braz\u00edlia \u00f3ce\u00e1ni \u00f6kosziszt\u00e9m\u00e1j\u00e1nak v\u00e1ltoz\u00e1sait<\/h2>\n\n

T\u00f6rt\u00e9nelmi hal\u00e1szati gyakorlatok adnak t\u00e1mpontokat<\/h2>\n\n

A 13. sz\u00e1zadban a braz\u00edliai Santa Catarina sziget \u0151slak\u00f3i er\u0151sen f\u00fcggtek a hal\u00e1szatt\u00f3l meg\u00e9lhet\u00e9s\u00fck biztos\u00edt\u00e1s\u00e1hoz. A kor\u00e1bbi part menti hal\u00e1szter\u00fclet, a Rio do Meio helysz\u00edn\u00e9n v\u00e9gzett r\u00e9g\u00e9szeti \u00e1sat\u00e1sok felt\u00e1rt\u00e1k tev\u00e9kenys\u00e9g\u00fck maradv\u00e1nyait, k\u00f6zt\u00fck c\u00e1pafogakat is.<\/p>\n\n

C\u00e1pafogak id\u0151kapszulak\u00e9nt<\/h2>\n\n

A c\u00e1pafogak \u00e9rt\u00e9kes inform\u00e1ci\u00f3forr\u00e1sok az \u00f6kosziszt\u00e9m\u00e1r\u00f3l, mivel kollag\u00e9nt tartalmaznak, egy olyan feh\u00e9rj\u00e9t, amely a c\u00e1pa \u00e9trendj\u00e9nek elemeit tartalmazza. A c\u00e1pafogakban l\u00e9v\u0151 nitrog\u00e9nizot\u00f3pok elemz\u00e9s\u00e9vel a kutat\u00f3k rekonstru\u00e1lhatj\u00e1k a t\u00f6rt\u00e9nelmi t\u00e1pl\u00e1l\u00e9kl\u00e1ncokat \u00e9s azonos\u00edthatj\u00e1k az id\u0151 m\u00fal\u00e1s\u00e1val bek\u00f6vetkez\u0151 v\u00e1ltoz\u00e1sokat.<\/p>\n\n

Stabil izot\u00f3pos elemz\u00e9s felt\u00e1rja az \u00e1trendez\u0151d\u00e9seket<\/h2>\n\n

Egy k\u00f6zelm\u00faltbeli tanulm\u00e1ny \u00f6sszehasonl\u00edtotta a Rio do Meio-b\u00f3l ki\u00e1sott c\u00e1pafogakat ugyanazon a ter\u00fcleten gy\u0171jt\u00f6tt modern fogakkal. Az eredm\u00e9nyek jelent\u0151s k\u00fcl\u00f6nbs\u00e9geket mutattak a nitrog\u00e9nizot\u00f3pok \u00e9rt\u00e9keiben, ami a c\u00e1p\u00e1k \u00e9trendj\u00e9nek \u00e9s a ragadoz\u00f3-zs\u00e1km\u00e1ny kapcsolatok v\u00e1ltoz\u00e1saira utal.<\/p>\n\n

A m\u00falt: v\u00e1ltozatos \u00e9trend \u00e9s rugalmass\u00e1g<\/h2>\n\n

\u00c9vsz\u00e1zadokkal ezel\u0151tt a k\u00fcl\u00f6nb\u00f6z\u0151 c\u00e1pafajok a t\u00e1pl\u00e1l\u00e9kl\u00e1nc hasonl\u00f3 szintjeir\u0151l sz\u00e1rmaz\u00f3 zs\u00e1km\u00e1nyokkal t\u00e1pl\u00e1lkoztak. Az \u00e9trendbeli \u00e1tfed\u00e9s egy rugalmas \u00f6kosziszt\u00e9m\u00e1t sugall, amelyben b\u0151s\u00e9ges zs\u00e1km\u00e1nylehet\u0151s\u00e9gek voltak.<\/p>\n\n

A jelen: specializ\u00e1ci\u00f3 \u00e9s cs\u00f6kkent rugalmass\u00e1g<\/h2>\n\n

Ezzel szemben a modern c\u00e1p\u00e1k kev\u00e9sb\u00e9 mutatnak \u00e9trendbeli \u00e1tfed\u00e9st, egyes fajok olyan zs\u00e1km\u00e1nyra specializ\u00e1l\u00f3dtak, amelyeket m\u00e1s c\u00e1p\u00e1k kev\u00e9sb\u00e9 zs\u00e1km\u00e1nyolnak. Ez a v\u00e1ltoz\u00e1s kev\u00e9sb\u00e9 rugalmas \u00f6kosziszt\u00e9m\u00e1t jelezhet, k\u00fcl\u00f6n\u00f6sen mivel a halfajok sz\u00e1ma a t\u00falhal\u00e1sz\u00e1s miatt cs\u00f6kkent.<\/p>\n\n

A homoki tigrisc\u00e1pa alkalmazkod\u00e1sa<\/h2>\n\n

A kutat\u00f3k a homoki tigrisc\u00e1p\u00e1ra \u00f6sszpontos\u00edtottak, amely id\u0151vel feljebb l\u00e9pett a t\u00e1pl\u00e1l\u00e9kl\u00e1ncon. Ez az alkalmazkod\u00e1s a t\u00falhal\u00e1sz\u00e1s miatt cs\u00f6kkent t\u00e1pl\u00e1l\u00e9kkonkurencia k\u00f6vetkezm\u00e9nye lehet, amely a faj kritikus vesz\u00e9lyeztetetts\u00e9g\u00e9hez vezetett.<\/p>\n\n

A t\u00falhal\u00e1sz\u00e1s lehets\u00e9ges hat\u00e1sa<\/h2>\n\n

B\u00e1r a tanulm\u00e1ny nem tudja hat\u00e1rozottan a t\u00falhal\u00e1sz\u00e1shoz k\u00f6tni az \u00e9trendv\u00e1ltoz\u00e1sokat, aggodalmat kelt a nem fenntarthat\u00f3 hal\u00e1szati gyakorlatok tengeri \u00f6kosziszt\u00e9m\u00e1kra gyakorolt lehets\u00e9ges k\u00f6vetkezm\u00e9nyei miatt.<\/p>\n\n

Rugalmass\u00e1g a kih\u00edv\u00e1sokkal szemben<\/h2>\n\n

Annak ellen\u00e9re, hogy a homoki tigrisc\u00e1p\u00e1knak szembe kell n\u00e9zni\u00fck, a tanulm\u00e1ny kiemeli figyelemre m\u00e9lt\u00f3 alkalmazkod\u00f3k\u00e9pess\u00e9g\u00fcket. M\u00e9g nyom\u00e1s alatt is siker\u00fclt t\u00fal\u00e9l\u00e9s\u00fck \u00e9rdek\u00e9ben kiigaz\u00edtaniuk t\u00e1pl\u00e1lkoz\u00e1si szok\u00e1saikat.<\/p>\n\n

Tov\u00e1bbi kutat\u00e1sokra van sz\u00fcks\u00e9g<\/h2>\n\n

A c\u00e1p\u00e1k v\u00e1ltoz\u00f3 \u00e9trendj\u00e9nek okait tov\u00e1bbi kutat\u00e1sokkal lehet teljes m\u00e9rt\u00e9kben meg\u00e9rteni. A meg\u00e1llap\u00edt\u00e1sok azonban al\u00e1h\u00fazz\u00e1k a tengeri \u00f6kosziszt\u00e9m\u00e1k v\u00e9delm\u00e9nek \u00e9s a hal\u00e1szat fenntarthat\u00f3 kezel\u00e9s\u00e9nek fontoss\u00e1g\u00e1t hossz\u00fa t\u00e1v\u00fa eg\u00e9szs\u00e9g\u00fck biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/p>","protected":false},"excerpt":{"rendered":"

C\u00e1pafogak fedik fel Braz\u00edlia \u00f3ce\u00e1ni \u00f6kosziszt\u00e9m\u00e1j\u00e1nak v\u00e1ltoz\u00e1sait T\u00f6rt\u00e9nelmi hal\u00e1szati gyakorlatok adnak t\u00e1mpontokat A 13. sz\u00e1zadban a braz\u00edliai Santa Catarina sziget \u0151slak\u00f3i er\u0151sen f\u00fcggtek a hal\u00e1szatt\u00f3l meg\u00e9lhet\u00e9s\u00fck biztos\u00edt\u00e1s\u00e1hoz. A kor\u00e1bbi part…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[1647,20943,20946,20947,243,20945,20944,642],"class_list":["post-15759","post","type-post","status-publish","format-standard","hentry","category-marine-biology","tag-adaptation","tag-shark-teeth","tag-food-chain","tag-sand-tiger-shark","tag-resilience","tag-stable-isotope-analysis","tag-marine-ecosystem","tag-overfishing"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/15759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/comments?post=15759"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/15759\/revisions"}],"predecessor-version":[{"id":15760,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/15759\/revisions\/15760"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/media?parent=15759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/categories?post=15759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/tags?post=15759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}