Amphibian passages

TRIEKOL III

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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.

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”.

Publications of the subproject

This subproject has resulted in a scientific article (published by PeerJ, 2019) and 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. 

Contact for the subproject

Jan Olof Helldin

j-o.helldin@slu.se
+46 (0) 706-07 53 22