Can We Save Mexico City’s Famous Axolotls?

Key Concepts

Axolotl, Xochimilco, Chinampas, Ecological Restoration, Invasive Species (Carp, Tilapia), Conservation, UNAM (National Autonomous University of Mexico), Chinampa Refugio Project, Sustainable Agriculture, Environmental DNA (eDNA).

Xochimilco and the Axolotl's Plight

Xochimilco, a borough in Mexico City, is a remnant of a lake system that once surrounded Tenochtitlan, the Aztec capital. It's known for its canals and trajineras (flat-bottomed wooden boats). While Xochimilco is a popular destination for celebration, it's also the last native refuge for the axolotl, a critically endangered salamander. The name "axolotl" comes from the Nahuatl language and means "water monster," named after an Aztec God. Despite its fame and presence in popular culture (Pokemon, Minecraft), spotting an axolotl in the wild is nearly impossible due to the degraded state of the canals.

Chinampas: Ancient Agriculture and Modern Restoration

The shoreline of Xochimilco consists of natural land and human-created floating islands called chinampas. Chinampas are floating gardens that were essential for agriculture in the Aztec empire. They are built by layering branches with mud to create rafts. Due to pressures from a growing city, pollution, and invasive fish species, the ecosystem has changed, pushing axolotls to near extinction.

UNAM's Research and Conservation Efforts

Researchers from the National Autonomous University of Mexico (UNAM) are studying the challenges faced by the axolotl and working on conservation efforts. They conduct surveys to estimate the remaining axolotl population in the wild, using methods like environmental DNA (eDNA) analysis to detect axolotls indirectly from cellular material in the water. The results of these surveys take time to analyze.

Dr. Luis Zambrano directs the ecological restoration laboratory at UNAM, where they study axolotls in a controlled environment. They observe the interaction between axolotls and invasive species like carp and tilapia to understand their competition for food. Experiments have shown that axolotls and these invasive species compete for food but don't prey on each other.

Carp and tilapia were introduced to Mexico City in the 1960s and 70s to provide food, but their populations exploded, displacing native species like the axolotl. The lab maintains a colony of axolotls with detailed records of their lineage to ensure genetic diversity for future reintroduction efforts. Each axolotl has a unique identification number. Dr. Zambrano views himself as a "spokesman" for the axolotls and local farmers, aiming to disseminate information to the public.

The Chinampa Refugio Project: Combining Tradition and Science

Vania and Luis are working with local farmers (chinamperos) through the Chinampa Refugio Project. This initiative combines ancient farming techniques with modern ecological restoration. The project focuses on restoring chinampas to create safe havens for axolotls and support sustainable agriculture. Chinampas act like sponges, absorbing nutrients from the water and soil, which keeps the land fertile. This traditional farming method aims to balance the entire ecosystem.

Vision for the Future

The goal is to restore at least 60% of Xochimilco's lands for farming and local livelihoods over the next 10 to 15 years. This would help revive the axolotl population and create a more sustainable food system for Mexico City.

Conclusion

The axolotl is a symbol of resilience and a reminder of the potential when tradition and science work together. The efforts to save the axolotl involve a multi-faceted approach, including scientific research, ecological restoration, and community engagement, all centered around the ancient agricultural practice of chinampas.