\nRata lor metabolic\u0103 este extrem de ridicat\u0103, necesit\u00e2nd uneori s\u0103 intre \u00eentr-o stare de toropeal\u0103 noaptea pentru a-\u015fi conserva energia. Aceast\u0103 abilitate remarcabil\u0103 le permite s\u0103 reziste \u00een condi\u0163ii dificile, cum ar fi migrarea peste oceane sau supravie\u0163uirea nop\u0163ilor reci cu un consum minim de alimente.<\/p>\n
\nCercet\u0103rile indic\u0103 faptul c\u0103 p\u0103s\u0103rile colibri \u00ee\u015fi pot varia semnificativ consumul de energie pe parcursul zilei. De\u015fi presupunerile anterioare sugereau c\u0103 ele petrec aproximativ 30% din timp hr\u0103nindu-se, noi descoperiri arat\u0103 c\u0103 obiceiurile lor alimentare depind de disponibilitatea florilor. \u00cen perioadele de abunden\u0163\u0103, ele ar putea avea nevoie doar de c\u00e2teva ore de hr\u0103nire, \u00een timp ce \u00een condi\u0163ii de penurie, ar putea petrece p\u00e2n\u0103 la 13 ore pe zi c\u0103ut\u00e2nd nectar. Aceast\u0103 adaptabilitate le ajut\u0103 s\u0103 \u00ee\u015fi gestioneze eficient nevoile energetice.<\/p>\n
\nP\u0103s\u0103rile colibri consum\u0103 nectar echivalent cu 80% din greutatea lor corporal\u0103 zilnic, ceea ce duce la niveluri de zah\u0103r \u00een s\u00e2nge mult peste cele observate la oameni. Sistemele lor digestive unice, caracterizate prin \u201eintestine permeabile\u201d, le permit s\u0103 absoarb\u0103 rapid zah\u0103rul, prevenind efectele adverse. Cercet\u0103torii studiaz\u0103 modul \u00een care evit\u0103 complica\u0163iile asociate cu nivelurile ridicate de zah\u0103r, inclusiv glica\u0163ia, care d\u0103uneaz\u0103 proteinelor \u00een alte specii.<\/p>\n
\nNoaptea, p\u0103s\u0103rile colibri se confrunt\u0103 cu o alt\u0103 provocare metabolic\u0103: epuizarea rezervelor de zah\u0103r, \u00een timp ce trebuie s\u0103 conserve ap\u0103. Pentru a combate deshidratarea, ele intr\u0103 \u00eentr-o stare de insuficien\u0163\u0103 renal\u0103, suspend\u00e2nd func\u0163ia renal\u0103 p\u00e2n\u0103 diminea\u0163a. Abilitatea lor remarcabil\u0103 de a comuta de la metabolismul pe baz\u0103 de zah\u0103r la cel pe baz\u0103 de gr\u0103simi \u00een c\u00e2teva minute ilustreaz\u0103 adapt\u0103rile lor evolutive.<\/p>\n
\nUnele specii de p\u0103s\u0103ri colibri prosper\u0103 la altitudini mari, unde nivelurile de oxigen sunt sc\u0103zute. Aceste p\u0103s\u0103ri au s\u00e2nge bogat \u00een hemoglobin\u0103 pentru a face fa\u0163\u0103 aerului rarefiat. Cercet\u0103rile recente dezv\u0103luie c\u0103 unele specii migreaz\u0103 c\u0103tre Anzi, aclimatiz\u00e2ndu-se treptat la altitudini mai mari, asem\u0103n\u0103tor alpinistilor umani.<\/p>\n
\nPe m\u0103sur\u0103 ce oamenii de \u015ftiin\u0163\u0103 continu\u0103 s\u0103 studieze aceste p\u0103s\u0103ri minuscule, se a\u015fteapt\u0103 noi descoperiri despre biologia lor \u015fi strategiile de supravie\u0163uire, eviden\u0163iind capacit\u0103\u0163ile extraordinare ale p\u0103s\u0103rilor colibri.<\/p>\n","protected":false},"excerpt":{"rendered":"
P\u0103s\u0103rile colibri nu sunt doar p\u0103s\u0103ri colorate \u015fi agile, ci duc un stil de via\u0163\u0103 extrem, care implic\u0103 adapt\u0103ri extraordinare pentru a supravie\u0163ui pe o diet\u0103 bogat\u0103 \u00een zah\u0103r, de a migra pe distan\u0163e mari \u015fi de a zbura chiar \u015fi la altitudini \u00eenalte, scrie Smithsonian Magazine.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[510],"tags":[25741,13162,58838],"class_list":["post-230802","post","type-post","status-publish","format-standard","hentry","category-actualitate","tag-dificultati","tag-oportunitati","tag-pasari-colibri"],"_links":{"self":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/230802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=230802"}],"version-history":[{"count":0,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/230802\/revisions"}],"wp:attachment":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=230802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=230802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=230802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}