{"id":17042,"date":"2022-12-15T08:54:23","date_gmt":"2022-12-15T08:54:23","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=17042"},"modified":"2022-12-15T08:54:23","modified_gmt":"2022-12-15T08:54:23","slug":"the-opah-the-only-fully-warmblooded-fish","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/ro\/science\/marine-biology\/the-opah-the-only-fully-warmblooded-fish\/","title":{"rendered":"Opah: singurul pe\u0219te cu s\u00e2nge cald"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Opah: Singurul pe\u0219te cu s\u00e2nge cald<\/h2>\n\n<h2 class=\"wp-block-heading\">Ce face opah unic?<\/h2>\n\n<p>Opah, un pe\u0219te de ad\u00e2ncime cu un corp argintiu, asem\u0103n\u0103tor unui balon, este o creatur\u0103 remarcabil\u0103 care iese \u00een eviden\u021b\u0103 de semenii s\u0103i prin adaptarea sa fiziologic\u0103 unic\u0103: este singurul pe\u0219te cunoscut cu s\u00e2nge complet cald. Aceasta \u00eenseamn\u0103 c\u0103, spre deosebire de majoritatea pe\u0219tilor care se bazeaz\u0103 pe apa din jur pentru a-\u0219i regla temperatura corpului, opah \u00ee\u0219i poate men\u021bine o temperatur\u0103 intern\u0103 stabil\u0103, ceea ce \u00eei ofer\u0103 un avantaj semnificativ \u00een habitatul s\u0103u de ad\u00e2ncime.<\/p>\n\n<h2 class=\"wp-block-heading\">Beneficiile s\u00e2ngelui cald<\/h2>\n\n<p>S\u00e2ngele cald ofer\u0103 pe\u0219tilor mai multe beneficii, printre care:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Areal extins:<\/strong> Pe\u0219tii cu s\u00e2nge cald pot locui \u00eentr-o gam\u0103 mai larg\u0103 de medii, at\u00e2t \u00een latitudine, c\u00e2t \u0219i \u00een ad\u00e2ncime, deoarece nu sunt limita\u021bi de temperatura apei din jur.<\/li>\n<li><strong>Vitez\u0103 crescut\u0103:<\/strong> Pe\u0219tii cu s\u00e2nge cald au o rat\u0103 metabolic\u0103 mai mare, ceea ce le permite s\u0103 \u00eenoate mai repede \u0219i s\u0103 parcurg\u0103 distan\u021be mai mari.<\/li>\n<li><strong>Percep\u021bie senzorial\u0103 \u00eembun\u0103t\u0103\u021bit\u0103:<\/strong> Pe\u0219tii cu s\u00e2nge cald au ochi mai calzi, ceea ce le \u00eembun\u0103t\u0103\u021be\u0219te vederea \u00een ad\u00e2ncurile \u00eentunecate ale oceanului.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Cum \u00ee\u0219i men\u021bine opah c\u0103ldura<\/h2>\n\n<p>Spre deosebire de mamifere, care genereaz\u0103 c\u0103ldur\u0103 prin metabolism chiar \u0219i \u00een repaus, pe\u0219tii se bazeaz\u0103 \u00een principal pe mi\u0219carea activ\u0103 pentru a-\u0219i men\u021bine temperatura corpului. Adaptarea unic\u0103 a opahului implic\u0103 un sistem specializat de vase de s\u00e2nge numit retia mirabilia, care este \u00eencorporat \u00een arcadele branhiale. Acest sistem ac\u021bioneaz\u0103 ca un radiator, transfer\u00e2nd c\u0103ldur\u0103 din s\u00e2ngele care curge prin branhii c\u0103tre restul corpului.<\/p>\n\n<h2 class=\"wp-block-heading\">Evolu\u021bia s\u00e2ngelui cald la pe\u0219ti<\/h2>\n\n<p>S\u00e2ngele par\u021bial cald a evoluat independent de mai multe ori la pe\u0219ti, dar r\u0103m\u00e2ne o adaptare relativ rar\u0103, g\u0103sit\u0103 la mai pu\u021bin de 0,1% din speciile de pe\u0219ti. Acest lucru se datoreaz\u0103 faptului c\u0103 este dificil s\u0103 re\u021bii c\u0103ldura \u00een ap\u0103, care este mult mai dens\u0103 dec\u00e2t aerul \u0219i absoarbe rapid c\u0103ldura corporal\u0103.<\/p>\n\n<h2 class=\"wp-block-heading\">Provoc\u0103rile s\u00e2ngelui cald \u00een ap\u0103<\/h2>\n\n<p>\u00cen ciuda avantajelor s\u00e2ngelui cald, exist\u0103 \u0219i provoc\u0103ri asociate cu men\u021binerea c\u0103ldurii corpului \u00een ap\u0103. O provocare major\u0103 este pierderea de c\u0103ldur\u0103 prin branhii, unde s\u00e2ngele este expus la apa rece pentru schimbul de oxigen. Pentru a dep\u0103\u0219i acest lucru, unii pe\u0219ti au dezvoltat sisteme specializate de vase de s\u00e2nge, cum ar fi retia mirabilia, pentru a minimiza pierderea de c\u0103ldur\u0103.<\/p>\n\n<h2 class=\"wp-block-heading\">Limit\u0103rile s\u00e2ngelui cald la pe\u0219ti<\/h2>\n\n<p>De\u0219i s\u00e2ngele cald ofer\u0103 avantaje semnificative, are \u0219i limit\u0103ri. Pe\u0219tii cu s\u00e2nge cald necesit\u0103 o rat\u0103 metabolic\u0103 mai mare pentru a-\u0219i men\u021bine temperatura corpului, ceea ce \u00eenseamn\u0103 c\u0103 trebuie s\u0103 consume mai mult\u0103 hran\u0103. \u00cen plus, corpurile lor calde \u00eei fac mai vulnerabili la pr\u0103d\u0103tori care folosesc organe senzoriale de c\u0103ldur\u0103 pentru a-\u0219i localiza prada.<\/p>\n\n<h2 class=\"wp-block-heading\">Semnifica\u021bia ecologic\u0103 a opahului<\/h2>\n\n<p>Adaptarea unic\u0103 a opahului la s\u00e2ngele complet cald i-a permis s\u0103 prospere \u00een mediul de ad\u00e2ncime, unde joac\u0103 un rol important \u00een ecosistemul marin. Ca pr\u0103d\u0103tor de top, opah ajut\u0103 la reglarea popula\u021biilor altor specii de pe\u0219ti. Capacitatea sa de a men\u021bine o temperatur\u0103 stabil\u0103 a corpului \u00eei permite, de asemenea, s\u0103 locuiasc\u0103 \u00eentr-o gam\u0103 mai larg\u0103 de habitate, contribuind la diversitatea general\u0103 a ecosistemului de ad\u00e2ncime.<\/p>","protected":false},"excerpt":{"rendered":"<p>Opah: Singurul pe\u0219te cu s\u00e2nge cald Ce face opah unic? Opah, un pe\u0219te de ad\u00e2ncime cu un corp argintiu, asem\u0103n\u0103tor unui balon, este o creatur\u0103 remarcabil\u0103 care iese \u00een eviden\u021b\u0103&hellip;<\/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":[1647,361,136,4116,6438,22499,22500],"class_list":["post-17042","post","type-post","status-publish","format-standard","hentry","category-marine-biology","tag-adaptation","tag-marine-biology","tag-evolution","tag-physiology","tag-deep-sea","tag-opah","tag-warmblooded-fish"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/17042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/comments?post=17042"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/17042\/revisions"}],"predecessor-version":[{"id":17043,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/17042\/revisions\/17043"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/media?parent=17042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/categories?post=17042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/tags?post=17042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}