Alger forbedrer Polarhavet

Isafsmeltningen omkring Nordpolen øger mængden af havets alger. Dermed bliver havets forhold ændret hurtigere, end man først regnede med.

En ekspedition med tyske forskere har vist, at den øgede algemængde i Arktis kan ændre havets økosystemet mere end først forventet. De ændringer som sker over overfladen grundet global opvarming, påvirker også havet.

Isen smeltede i sommers og alger, som før sad på undersiden af isen, sank ned til bunds med den smeltede is. De kædede sig sammen i rækker og blev dermed tunge nok til at kunne synke flere tusind meter ned.

Algerne er føde til bundens liv. Eksempelvis søpølsen kan overleve på en diæt af alger.

Ekspeditionen tog sted i løbet af 2012. I år skal der vurderes om disse forhold blot var gældende for det forgangne år, eller om der er tale om en længerevarende tendens.

Kilde: Jyllands-Posten og Forskning.no

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