Integrated analysis for population estimation, management impact evaluation, and decision-making for a declining species
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Published source details
Crawford B.A., Moore C.T., Norton T.M. & Maerz J.C. (2018) Integrated analysis for population estimation, management impact evaluation, and decision-making for a declining species. Biological Conservation, 222, 33-43.
Published source details Crawford B.A., Moore C.T., Norton T.M. & Maerz J.C. (2018) Integrated analysis for population estimation, management impact evaluation, and decision-making for a declining species. Biological Conservation, 222, 33-43.
Actions
This study is summarised as evidence for the following.
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Use signage to warn motorists about wildlife presence Action Link |
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Install barriers along roads/railways Action Link |
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Use signage to warn motorists about wildlife presence
A before-and-after study in 2009–2015 on saltmarsh in Georgia, USA (Crawford et al. 2018) found that adding a flashing terrapin-warning sign to alert motorists and partially fencing a causeway reduced the likelihood of mortality for diamondback terrapins Malaclemys terrapin crossing the road. When the flashing signs and hybrid nestbox-fence barrier were installed on a road, survival of crossing female diamondback terrapins increased from 24% to 53% (data reported as statistical model outputs). In 2011, a 22 m hybrid nestbox-fence barrier was built along a 9 km long causeway. In 2013, two terrapin crossing signs with flashing warning beacons were added to warn motorists entering a 6 km stretch of causeway. The signs were activated for 2 hours/day during peak terrapin crossing times. Terrapins were surveyed on the causeway and in adjacent creeks during the nesting season (May–July) in 2009–2015.
(Summarised by: Katie Sainsbury)
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Install barriers along roads/railways
A before-and-after study in 2009–2015 on a causeway over a saltmarsh in Georgia, USA (Crawford et al. 2018, same experimental set-up as Crawford et al. 2017) found that installing a roadside barrier with nest boxes and adding a flashing terrapin-warning sign to alert motorists reduced likelihood of mortality for diamondback terrapin Malaclemys terrapin crossing the road. When the hybrid nestbox-fence barrier and flashing signs were added to a road, survival of crossing female diamondback terrapins increased from 24% to 53% (data reported as statistical model outputs). In 2011, a 22 m long hybrid nestbox-fence barrier was built along an 8.7 km long causeway. In 2013, two terrapin crossing signs with flashing warning beacons were added to warn motorists entering a 6 km stretch of causeway. The signs were activated for 2 hours/day during peak terrapin crossing times. Terrapins were surveyed on the causeway and in adjacent creeks during the nesting season (May–July) in 2009–2015.
(Summarised by: Katie Sainsbury)
