{"id":27520,"date":"2023-04-06T13:23:06","date_gmt":"2023-04-06T11:23:06","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=27520"},"modified":"2023-11-23T16:05:58","modified_gmt":"2023-11-23T15:05:58","slug":"aven-havet-har-arstider","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/aven-havet-har-arstider\/","title":{"rendered":"\u00c4ven havet har \u00e5rstider"},"content":{"rendered":"\n

Det \u00e4r senvinter. I Trondheimsfjorden i Norge v\u00e4ntar korallerna och alla dess inv\u00e5nare p\u00e5 ljuset och v\u00e4rmen som ska komma tillbaka. Havet har, precis som p\u00e5 land, \u00e5rstider som p\u00e5verkar beteenden och tillv\u00e4xt.<\/p>\n\n\n\n

N\u00e4r vi \u00e4r d\u00e4r och dyker, i b\u00f6rjan av mars, \u00e4r vattnet fortfarande kallt och dagarna korta. Kokande vatten h\u00e4lls i dykhandskarna f\u00f6r att h\u00e5lla fingrarna varma. I alla fall en stund. <\/p>\n\n\n\n

Med v\u00e5rens int\u00e5g \u00f6kar solljuset. M\u00e5nga djur b\u00f6rjar sin lekperiod och f\u00e5r br\u00e5ttom att v\u00e4xa och fortplanta sig. <\/p>\n\n\n\n

P\u00e5 m\u00e5nga h\u00e5ll i v\u00e4rlden sker nu ett av naturens stora spektakel. Hela kolonier av koraller sl\u00e4pper samtidigt ut sina sm\u00e5 \u00e4gg och spermier, kallade gameter, i havet. Miljarder f\u00e4rgglada flingor virvlar runt i vitt, gult, r\u00f6tt och orange.<\/p>\n\n\n\n

Eftersom k\u00f6nscellerna hos de flesta korallarter \u00e4r livskraftiga i bara n\u00e5gra timmar beh\u00f6ver gameterna sl\u00e4ppas samtidigt. <\/p>\n\n\n\n

Forskarna vet fortfarande v\u00e4ldigt lite om hur denna synkroniserade fortplantning kan ske. Men vattentemperatur och m\u00e5nens cykel verkar ha stor betydelse. <\/p>\n\n\n\n

Milj\u00f6n i Trondheimsfjorden \u00e4r unik. H\u00e4r finns koraller och organismer som annars bara hittas p\u00e5 tusen meters djup. Stenkorallen Lophelia pertusa<\/em> beskrevs redan 1768 av en ih\u00e4rdig biologi-intresserad pr\u00e4st. Sedan dess har korallerna v\u00e4xt sakta, bara 5 mm. per \u00e5r.<\/p>\n\n\n\n

Lite l\u00e4ngre ut ligger v\u00e4rldens n\u00e4st st\u00f6rsta rev med stenkoraller – Sularevet<\/em>. 13 km l\u00e5ngt, flera hundra meter brett och 30 meter h\u00f6gt. Revet \u00e4r en barnkammare f\u00f6r m\u00e5nga av de arter som fiskeindustrin \u00e4r s\u00e5 beroende av. Bland korallgrenarna kl\u00e4cks \u00e4ggen av sej, torsk och l\u00e5nga, hummer och andra kr\u00e4ftdjur. <\/p>\n","protected":false},"excerpt":{"rendered":"

Det \u00e4r senvinter. I Trondheimsfjorden i Norge v\u00e4ntar korallerna och alla dess inv\u00e5nare p\u00e5 \u00a0ljuset och v\u00e4rmen som ska komma tillbaka. Havet har, precis som p\u00e5 land, \u00e5rstider som p\u00e5verkar beteenden och tillv\u00e4xt.<\/p>\n","protected":false},"author":3,"featured_media":28952,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[244],"tags":[248,381,432],"class_list":["post-27520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-klimat-och-miljo","tag-klimat","tag-koraller","tag-norge"],"acf":[],"yoast_head":"\n\u00c4ven havet har \u00e5rstider - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"Det \u00e4r senvinter. I Trondheimsfjorden i Norge v\u00e4ntar korallerna och alla dess inv\u00e5nare p\u00e5\u00a0ljuset och v\u00e4rmen som ska komma tillbaka. 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