Scientists are trying to save frogs from extinction by making them poisonous again

Atelopus frog species, endemic to Central and South America and facing the threat of extinction in their natural habitat, are among the top conservation priorities for scientists. These creatures naturally contain extremely potent toxins to defend themselves against predators. In fact, this poison is so powerful that the amount of poison a single frog possesses can kill thousands of mice. However, the emergence of a fungus species known as the deadliest wildlife pathogen in recorded history caused a devastating decline in the population of these species. To overcome this crisis and keep the species alive, scientists resorted to breeding and keeping the frogs in captivity.

In 2017, a significant step was taken within the scope of the Panama Amphibian Rescue and Conservation Project, where 83 captive-bred frogs were released into the wild. However, while this captive environment successfully protected the frogs from the deadly fungus, it also brought an unexpected and highly critical side effect. These frogs, whether released into the wild or continuing to live in captivity, no longer carried the potent poisons that once protected them. Having lost their toxins, these creatures became virtually defenseless and easy prey for predators in their natural habitats. This situation caused the conservation efforts to not yield the expected results, pushing scientists to search for new and creative solutions.

Brian Gratwicke, a conservation biologist working on the Panama Amphibian Rescue and Conservation Project, poses this humorous but highly apt question to his team to solve this fundamental problem: 'How can we make these frogs spicy (poisonous) again?' The primary focus of the researchers is to determine the toxin levels in wild frogs and compare this data with those bred in captivity. Phillip Jervis, a chemist from Imperial College London, conducted a critical field study in this area during his time at the Smithsonian's laboratory in Panama, collecting more than a dozen frog specimens. By placing each frog in a special plastic bag containing stress hormones, Jervis successfully obtained the necessary chemical samples to induce toxin secretion.

Scientists have not yet fully unraveled how these frogs naturally become poisonous. Researchers believe the source of the poison could originate from environmental factors, a specific type of algae they consume, or a mysterious part of the food chain. Therefore, the research team is carefully examining whether captive-bred frogs that are released into the wild can simply regain their toxins through the nutrients they obtain from their environment when they return to their natural habitats. Jervis is currently analyzing his samples in detail in the laboratory to uncover the chemical and toxic differences between wild frogs and those raised in captivity.

Another experimental method applied to restore toxins is based on manipulating the frogs' dietary habits. Scientists specially injected poison into the frogs' natural prey, moths, raised them in a laboratory environment, and conducted an experiment by feeding these insects to the frogs. Following this interesting experiment, it was observed that the frogs survived when consuming the poisonous insects and that their digestive systems were resistant to these toxins. However, researchers are still unsure whether this dietary intervention method can fully restore the toxin levels found in the frogs' natural wild counterparts. For this reason, the scientific world continues its work with great meticulousness to unravel the secrets of this critical chemical defense mechanism in order to permanently conserve amphibian species.