What Works in Conservation 2020
| , , ,10. Some aspects of control of freshwater invasive species
10.6 Threat: Invasive amphibians
Texte intégral
10.6.1 American bullfrog Lithobates catesbeiana
Likely to be beneficial
Biological control using native predators
1One replicated, controlled study conducted in northeast Belgium found the introduction of the northern pike led to a strong decline in bullfrog tadpole numbers. Assessment: likely to be beneficial (effectiveness 70 %; certainty 40 %; harms 0 %).
2https://www.conservationevidence.com/actions/1039
Direct removal of adults
3One replicated study in Belgium found catchability of adult bullfrogs in small shallow ponds using a double fyke net to be very low. One small study in the USA found that adult bullfrogs can be captured overnight in a single trap floating on the water surface. One replicated, controlled study in the USA found that bullfrog populations rapidly rebounded following intensive removal of the adults. One study in France found a significant reduction in the number of recorded adults and juveniles following the shooting of metamorphosed individuals before reproduction, when carried out as part of a combination treatment. Assessment: likely to be beneficial (effectiveness 50 %; certainty 70 %; harms 0 %).
4https://www.conservationevidence.com/actions/1045
Direct removal of juveniles
5One replicated study in Belgium found double fyke nets were effective in catching bullfrog tadpoles in small shallow ponds. One study in France found a significant reduction in the number of recorded adults and juveniles following the removal of juveniles by trapping, when carried out as part of a combination treatment. Assessment: likely to be beneficial (effectiveness 70 %; certainty 60 %; harms 0 %).
6https://www.conservationevidence.com/actions/1046
Unknown effectiveness (limited evidence)
Application of a biocide
7One replicated, controlled study in the USA reported a number of chemicals killed American bullfrogs, including caffeine (10 % solution), chloroxylenol (5 % solution), and a combined treatment of Permethrin (4.6 % solution) and Rotenone (1 % solution). Assessment: unknown effectiveness (effectiveness 50 %; certainty 20 %; harms 0 %).
8https://www.conservationevidence.com/actions/1048
No evidence found (no assessment)
9We have captured no evidence for the following interventions:
- Biological control of co-occurring beneficial species
- Collection of egg clutches
- Draining ponds
- Fencing
- Habitat modification
- Pond destruction
- Public education.
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