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Tunnels in combination with guiding fences are standard mitigation measures for roads near amphibian habitats, designed to lower the number of road-killed amphibians while still allowing them to pass the road. However, the monitoring of such measures often fails to answer whether the both goals (lowered roadkill and barrier effect) are reached, and accordingly available design guidelines for amphibian tunnels and guiding fences stand on a weak foundation.
In the last years, the following three amphibian mitigation sites near Stockholm were monitored:
- Skårby (Botkyrka) –Trafikverkets project, tunnels and fences constructed in 2005-2008, monitoring conducted 2004-2013 by Ekologigruppen AB.
- Kyrksjölöten (Bromma) –Stockholm municipalitys project, tunnels and fences constructed in 2014, monitoring conducted 2012-2015 by Calluna AB.
- Skeppdalsström (Värmdö) – Trafikverkets project, tunnels and fences constructed in 2015, monitoring conducted 2013-2016 by Calluna AB.
The monitoring derived valuable results regarding effectiveness of amphibian mitigation measures in reducing roadkill and barrier effects. We have now summarised and compared these results, and analysed what they imply for future mitigation, i.e. how they can help answering the questions “where” and “how”.
This subproject is completed. It is reported in the following scientific manuscript:
- Effectiveness of small road tunnels and fences in reducing amphibian roadkill and barrier effects; case studies of retrofitted roads in Sweden
The technical report for the monitoring in Skeppdalsström was also finalised within this subproject:
Links to all technical reports from the three sites can be found here.
Centrum för biologisk mångfald, SLU
+46 (0)706-07 53 22