Villminkens (Mustela vison) effekt på klekkesuksessen til sjøfugl ved Sørlandskysten.

• Main Author: Udø, Per Ovin
• Other Authors: Harald Steen
• Format: Master Thesis
• Language: Norwegian Bokmål
• Published: 2005
• Subjects: VDP::488; Four Islands; Common Eider; Lesser black-backed gull; Somateria mollissima
• Online Access: http://hdl.handle.net/10852/11724; http://urn.nb.no/URN:NBN:no-13440

It is stated that the feral American mink (Mustela vison), an introduced predator to Europe, have seriously affected local densities of birds breeding in coastal areas. I studied the effect of mink removal on breeding success of Great black-backed gull (Larus marinus), Lesser black-backed gull (Larus fuscus) and Common eider (Somateria mollissima). Prior to the hatching season 2004 I removed mink from three islands and kept the mink present at four islands. During the spring and summer I recorded the hatching successes on al the islands. The hatching success was unaffected for Lesser black-backed gull and Common eider by the mink removal. For Great black-backed gull the hatching success showed a negative trend by mink removal and also a negative trend on islands with crow nests (Corvus corone) I concluded that mink removal had no positive effect on hatching successes for Great black-backed gull, Lesser black-backed gull or Common eider.