Villminkens (Mustela vison) effekt på klekkesuksessen til sjøfugl ved Sørlandskysten.
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 (Laru...
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| Format: | Master Thesis |
| Language: | Norwegian Bokmål |
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2005
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| Online Access: | http://hdl.handle.net/10852/11724 http://urn.nb.no/URN:NBN:no-13440 |
| Summary: | 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. |
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