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What Works in Conservation 2020

William J. Sutherland
Lynn V. Dicks
Silviu O. Petrovan
et al.

7. Primate conservation

7.4 Threat: Transportation and service corridors

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Likely to be beneficial

Install rope or pole (canopy) bridges

1One before-and-after study in Belize study found that howler monkey numbers increased after pole bridges were constructed over man-made gaps. Two studies in Brazil and Madagascar found that primates used pole bridges to cross roads and pipelines. Assessment: likely to be beneficial (effectiveness 50 %; certainty 50 %; harms 0 %).


No evidence found (no assessment)

3We have captured no evidence for the following interventions:

  • Install green bridges (overpasses)
  • Implement speed limits in particular areas (e.g. with high primate densities) to reduce vehicle collisions with primates
  • Reduce road widths
  • Impose fines for breaking the speed limit or colliding with primates
  • Avoid building roads in key habitat or migration routes
  • Implement a minimum number of roads (and minimize secondary roads) needed to reach mining extraction sites
  • Re-use old roads rather than building new roads
  • Re-route vehicles around protected areas
  • Install speed bumps to reduce vehicle collisions with primates
  • Provide adequate signage of presence of primates on or near roads.

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