Usefulness of volunteer data to measure the large scale decline of ‘‘common’’ toad populations

  • Published source details Bonardi A., Manenti R., Corbetta A., Ferri V., Fiacchini D., Giovine G., Macchi S., Romanazzi E., Soccini C., Bottoni L., Padoa-Schioppa E. & Ficetola G.F. (2011) Usefulness of volunteer data to measure the large scale decline of ‘‘common’’ toad populations. Biological Conservation, 144, 2328-2334.


This study is summarised as evidence for the following.

Action Category

Use humans to assist migrating amphibians across roads

Action Link
Amphibian Conservation
  1. Use humans to assist migrating amphibians across roads

    A study in 1993–2010 of toad patrols during in Central and Northern Italy (Bonardi et al. 2011) found that although 1,042,966 common toads Bufo bufo were assisted across roads breeding migrations, 70% of 30 populations declined substantially from 2000 to 2010. Only 10% of the populations increased over the same period. Data on population trends were gathered mainly from volunteer toad patrol groups, with some from other volunteer groups, herpetologists and the literature. Sampling effort was taken into account when examining population trends.


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