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Effectiveness of unmanned aerial vehicles to detect Amazon dolphins

  • Marcelo Oliveira-da-Costa (a1), Miriam Marmontel (a2), Daiane S. X. da-Rosa (a2), André Coelho (a2), Serge Wich (a3), Federico Mosquera-Guerra (a4) and Fernando Trujillo (a4)...

Abstract

Quantifying the abundance of species is essential for their management and conservation. Much effort has been invested in surveys of freshwater dolphins in the Amazon basin but river dimensions and complex logistics limit replication of such studies across the region. We evaluated the effectiveness of using unmanned aerial vehicles (UAVs) for surveying two Amazon dolphin species, the tucuxi Sotalia fluviatilis and pink river dolphin Inia geoffrensis, in tropical rivers. In 2016 we conducted drone and visual surveys over 80 km of the Juruá River in Brazil. The aerial surveys provided higher accuracy than human observers in counting individuals detected in groups. Compared to estimates derived from visual surveys, the use of UAVs could provide a more feasible, economical and accurate estimate of Amazon river dolphin populations. The method could potentially be replicated in other important areas for the conservation of these species, to generate an improved index of river dolphin populations in the Amazon.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

(Corresponding author) E-mail marcelo@wwf.org.br

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Keywords

Effectiveness of unmanned aerial vehicles to detect Amazon dolphins

  • Marcelo Oliveira-da-Costa (a1), Miriam Marmontel (a2), Daiane S. X. da-Rosa (a2), André Coelho (a2), Serge Wich (a3), Federico Mosquera-Guerra (a4) and Fernando Trujillo (a4)...

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