{"id":36085,"date":"2024-08-05T11:42:03","date_gmt":"2024-08-05T09:42:03","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=36085"},"modified":"2024-09-10T16:43:49","modified_gmt":"2024-09-10T14:43:49","slug":"hotad-haj-visar-tecken-pa-jungfrufodsel","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/hotad-haj-visar-tecken-pa-jungfrufodsel\/","title":{"rendered":"Hotad haj visar tecken p\u00e5 jungfruf\u00f6dsel"},"content":{"rendered":"\n

En utrotningshotad hajart har har visat tecken p\u00e5 ”jungfruf\u00f6dsel”. Italienska forskare har uppt\u00e4ckt att honor av arten hundhaj f\u00e5tt ungar \u2013 utan att en hane varit inblandad.<\/strong><\/p>\n\n\n\n

\"\"
En fiskare i New Jersey i USA h\u00e5ller upp en haj. Forskare i Italien har uppt\u00e4ckt att fiskar av arten sydlig hundhaj kan f\u00f6rs\u00f6ka sig utan befruktning. (Arkivbild) Foto: Julia Nikhinson AP\/TT<\/figcaption><\/figure>\n\n\n\n

Den sydliga hundhajen, som f\u00f6rekommer i stora delar av \u00f6stra Atlanten och Medelhavet, kan s\u00e5ledes f\u00f6r\u00f6ka sig genom obefruktade \u00e4gg. Uppt\u00e4ckten gjordes av italienska forskare som observerat tv\u00e5 honor av den hotade arten under flera \u00e5r.<\/p>\n\n\n\n

Hajarna har levt i f\u00e5ngenskap utan manligt s\u00e4llskap sedan 2010. F\u00f6r fyra \u00e5r sedan uppt\u00e4ckte forskarna vid ett institut i italienska Ligurien att honorna f\u00f6r\u00f6kat sig.<\/p>\n\n\n\n

Sedan dess har hajarna f\u00e5tt avkommor varje \u00e5r. Forskningsresultaten publiceras i tidskriften Scientific Reports.<\/p>\n\n\n\n

”Det h\u00e4r visar att partenogenes (asexuell f\u00f6r\u00f6kning) kan intr\u00e4ffa \u00e5rligen i dessa hajar och utesluter definitivt att lagrade spermier ligger bakom f\u00f6r\u00f6kningen”, skriver forskningsstudiens f\u00f6rfattare.<\/p>\n\n\n\n

Partenogenes \u00e4r en form av asexuell f\u00f6r\u00f6kning som g\u00f6r att vissa djurarter kan producera avkomma genom obefruktade \u00e4gg. Fenomenet, som ibland kallas jungfruf\u00f6dseln, har p\u00e5tr\u00e4ffats bland fiskar, reptiler, grodor, f\u00e5glar, spindeldjur och bladl\u00f6ss.<\/p>\n\n\n\n

I v\u00e5ras skapade stingrockan Charlotte rubriker n\u00e4r hon f\u00f6dde ungar p\u00e5 ett akvarium i Georgia, USA, trots att hon levt som singel i \u00e5tta \u00e5r.<\/p>\n","protected":false},"excerpt":{"rendered":"

En utrotningshotad hajart har har visat tecken p\u00e5 ”jungfruf\u00f6dsel”. Italienska forskare har uppt\u00e4ckt att honor av arten hundhaj f\u00e5tt ungar \u2013 utan att en hane varit inblandad.<\/p>\n","protected":false},"author":4,"featured_media":36086,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[634,1573,1575,2654],"class_list":["post-36085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ovrigt","tag-hajar","tag-jungfrufodsel","tag-partenogenes","tag-sydlig-hundhaj"],"acf":[],"yoast_head":"\nHotad haj visar tecken p\u00e5 jungfruf\u00f6dsel - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"En utrotningshotad hajart har har visat tecken p\u00e5 "jungfruf\u00f6dsel". 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