The American bullfrog has been eradicated for now from the Ebro Delta. Each word of the sentence should be spoken for maximum clarity and emphasis, yet the current assessment is that the species is not present in the delta at this time. The amphibian first appeared as a larva in 2018, raising concerns about potential disruption to the delta ecosystem. Preliminary actions were taken with available tools to address the issue.
This summer marks five years since that initial finding and, after recent DNA analyses, there is no conclusive evidence of the frog in the delta. Fishing nets were employed to capture any possible specimens, but none were found.
To verify the validity of the collected data, listening surveys were conducted at multiple sites, but the Lithobates catesbeianus song was not detected.
right approach
The probable eradication of this species is attributed to early detection efforts by Delta Nature Park. The American bullfrog is an invasive species that tends to move quickly into wetlands, making swift action essential.
Other invasive species entering the Ebro Delta, such as the blue mussel and the apple snail, prompted stronger measures and greater control. In this case, a six-kilometer perimeter around known locations was fenced to limit spread. Within enclosed areas, coordinated capture and tracking efforts were organized, with participation from organizations, volunteers, research teams, and experts.
In 2024, verification efforts will be repeated to ensure accuracy. Fifteen points were not detected this year, and technicians emphasize that it is still too early to claim victory. Nonetheless, partial success has been observed in the current season.
frog legs
The American bullfrog is among the most harmful invasive species worldwide due to its rapid spread once introduced to new regions. Its adaptability has facilitated its expansion to more than 40 countries, where it remains difficult to eradicate despite concerted efforts. For example, in certain areas of Europe, populations persist despite ongoing control measures.
The presence of this frog disrupts ecosystems by displacing or preying upon native amphibians and reptiles. It can alter vegetation structure and is a vector for diseases and parasites, such as the fungus Batrachochytrium dendrobatidis, which has contributed to declines in amphibian populations globally.
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