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Spawning site selection by invasive Asian toads (Duttaphrynus melanostictus) in eastern Madagascar
Benjamin J Muller1,2, Rodino Fetraharijaona Harison1, Nomenjanahary Faly Randriamanantena3
1Madagascar Fauna and Flora Group, Toamasina, Madagascar.
Pest Management Science
|January 23, 2025
Summary
Asian toads in Madagascar prefer small waterbodies with gentle slopes for spawning. Understanding these invasive toad spawning preferences can inform management strategies to control their spread.
Area of Science:
- Ecology
- Invasive Species Biology
- Conservation Science
Background:
- Invasive species pose a significant threat to global biodiversity.
- Asian toads (Duttaphrynus melanostictus) are an invasive anuran species in Madagascar, spreading rapidly since their introduction.
- Understanding invasive species' life history vulnerabilities is key to developing effective control strategies.
Purpose of the Study:
- To investigate the specific habitat characteristics Asian toads select for spawning in their invaded range in Madagascar.
- To identify potential vulnerabilities in Asian toad spawning behavior for management purposes.
Main Methods:
- A comparative study was conducted on 30 waterbodies used by Asian toads for spawning and 30 adjacent, unused waterbodies.
- Habitat characteristics of selected and unselected waterbodies were surveyed in both urban and rural areas of eastern Madagascar.
Main Results:
- Asian toads demonstrated a clear preference for small waterbodies with gently sloping banks for oviposition.
- Factors such as surrounding vegetation, water chemistry, presence of other species, water depth, and bank substrate did not significantly influence spawning site selection.
Conclusions:
- The findings highlight specific waterbody characteristics that attract Asian toads for spawning.
- Modifying these preferred spawning site characteristics presents a potential management strategy for controlling invasive Asian toad populations.
