Klokker, Campanula, er svært viktige planter for ville bier. Sju biearter besøker regulært klokker og nekter å spise særlig annet. Dette gjelder følgende arter: klokkesolbie, Dufourea dentiventris, engsandbie, Andrena bicolor, perlebie, Biastes truncatus (lever parasittisk på klokkesolbie), markskjærerbie, Megachile willughbiella, klokketrebie, Chelostoma campanularum, blåklokkebie, Melitta haemorrhoidalis og lundhumle, Bombus soroeensis.
I tillegg til å være kilde for pollen og nektar, fungerer selve blomsten eller klokka også som hus og le for flere av artene ved at de gjemmer seg inni dem om natten og i regnvær. De fleste artene som besøker blåklokker har reir i jorda, men klokketrebia har reir i tørre soleksponerte trestammer. Det sammme har orkidetrebia, Chelostoma rapunculi, som enda ikke er påvist i Norge. Denne er berømt får å være pollinator for den truete orkidene rød skogfrue. Det er derfor viktig å ta vare på både blåklokkene og miljøet rundt!
Dette er et spennende tema. Om du har tid til å kikke på et bilde av ei bie jeg fotograferte i fagerklokke, ved siden av rød skogfrue, så er linken her: http://www.bio.no/enbiolog/topic.asp?TOPIC_ID=43421
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Finn Michelsen
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