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Background
Tunnels in combination with guiding fences are standard mitigation measures for roads near amphibian habitats. They are 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 two 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
Swedish Transport Administration project, tunnels and fences constructed in 2005-2008, monitoring conducted 2004-2013 by Ekologigruppen AB.
Kyrksjölöten, Bromma
Stockholm municipality project, tunnels and fences constructed in 2014, monitoring conducted 2012-2015 by Calluna AB.
Skeppdalsström, Värmdö
Swedish Transport Administration project, tunnels and fences constructed in 2015, monitoring conducted 2013-2016 by Calluna AB.
Field survey of amphibians at site Skeppdalsström. Photo: J-O Helldin.
Technical reports for the amphibian mitigation sites
The reports (all in Swedish) of the three mitigation sites near Stockholm, Sweden can be found here:
Skårby
- Ekologigruppen (2004). Utredning av behov av groddjurspassage vid Skårbydammen.
- Ekologigruppen (2005). Groddjurstunnlarna vid Skårbydammen, Salems kommun.
- Ekologigruppen (2006). Utvärdering av grodtunnlar vid Skårbydammen, Salem våren 2006.
- Peterson (2007). Utvärdering av grodtunnlar vid Skårbydammen.
- Collinder (2007). Skårby Åtgärdsförslag.
- Syde (2008). Groddjursinventering vid konfliktpunkter i Stockholms län.
- Nilsson (2009). Groddjursinventering 2009 vid konfliktpunkter i Stockholms län.
- Collinder (2010). Groddjursinventering 2010 vid konfliktpunkter i Stockholms län.
- Peterson (2013). Utvärdering av grodtunnlar i Skårbydammen.
Kyrksjölöten
- Calluna (2012). Groddjursinventering Undersökning av vandringsmönster samt rapportens kartbilaga.
- Helldin (2015). Uppföljning och utvärdering av groddjurstunnlar.
Skeppdalsström
- Peterson (2013). Utredning inför grodtunnlar vid Stavnäsvägen.
- Lundberg (2015). PM Rekommendationer inför anläggande av groddjurstrummor, väg 222, vid Skeppdalsström.
- Andersson & Lundberg (2015). Groddjursinventering och flytt vid väg 222.
- Helldin et al (2018). Uppföljning och utvärdering av groddjursåtgärder vid Skeppdalsström.
Publications and outreach
The subproject Amphibian passages has resulted in a scientific article (published by PeerJ, 2019). The technical report for the monitoring in Skeppdalsström was also finalised within this subproject (see below). Links to all technical reports from the three sites can be found above.
