A critical examination of fauna passages in connection with the motorway between Ikast and Låsby
Author
Thomsen, Kirsten Plesner
Term
4. term
Education
Publication year
2014
Submitted on
2014-06-02
Pages
64
Abstract
Motorveje kan fungere som barrierer, der splitter dyrebestande. Hvis dyr ikke længere kan krydse, stopper genudvekslingen, den genetiske variation falder, og lokale bestande bliver mere sårbare over for at forsvinde. For at mindske denne risiko har dyr brug for sikre måder at krydse veje på. Mange lande har retningslinjer for at udforme sådanne faunapassager; denne rapport gennemgår retningslinjer fra Danmark, Østrig og Californien. Den forklarer også, hvorfor erfaringer fra udlandet kan være svære at overføre til Danmark, hvor naturen er mere præget af mennesker, og levestederne er stærkt opsplittede. Med motorvejen mellem Ikast og Låsby som casestudie vurderer rapporten de eksisterende faunapassager: deres kvalitet, placering og om der er behov for flere. På baggrund af disse vurderinger og relevant litteratur gives nye anbefalinger. Selvom den nye strækning viser forbedringer i forhold til ældre veje, er der stadig vigtige videnshuller for at kunne placere faunapassager optimalt. Især er der behov for flere adfærdsstudier af forskellige arter ved motorveje.
Motorways can act as barriers that split wildlife populations. When animals can no longer cross, gene exchange stops, genetic diversity declines, and local populations become more vulnerable to dying out. To reduce this risk, animals need safe ways to cross roads. Many countries have guidelines for designing such wildlife crossings; this report reviews those from Denmark, Austria, and California. It also explains why lessons from abroad are hard to transfer to Denmark, where nature areas are more human-affected and habitats are highly fragmented. Using the Ikast–Låsby motorway as a case study, the report assesses existing wildlife crossings (fauna passages): their quality, where they are placed, and whether more are needed. Combining these assessments with relevant literature, it offers new recommendations. Although the newer route shows improvements compared with older stretches, important knowledge gaps remain for placing crossings optimally. In particular, more studies of how different species behave near motorways are needed.
[This abstract was generated with the help of AI]
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