Aztec methods and crocodiles restore Mexican mangroves

A non-profit organization in southeastern Mexico is revitalizing destroyed mangrove forests by blending ancient Aztec agricultural strategies with crocodile reintroductions. In the Alvarado Lagoons System located in Veracruz, REVIVE has developed a dual strategy to address severe mangrove deforestation across the region.

Ancient Farming Methods Mexico has experienced more severe mangrove loss than any other nation in the Americas, largely driven by land clearing for cattle ranching that caused wetland soils to sink. Early planting attempts often failed because seedlings drowned in the submerged terrain. To solve this, REVIVE director Aníbal Ramírez Soto adopted the Aztec concept of "chinampas," creating raised soil mounds in shallow water to give young trees higher ground.

The raised mound approach allowed planted seedlings to survive and trapped floating seeds arriving on tides. What began as a hand-built trial of roughly 2,000 trees expanded into more than 4,000 established plants. Over eight years, tree canopy coverage reached 80 percent, prompting the team to scale up operations using machinery to build 15,000 mounds across 40 hectares.

Integrating Apex Predators Beyond growing trees, project leaders emphasize that healthy ecosystems require native animal species. In 2017, the organization began releasing Morelet's crocodiles into the restored wetlands to replace populations lost to past hunting. Drawing on insights from a Colombian initiative in Cispatá Bay, project coordinators explain that swimming crocodiles help keep water channels clear of obstructing vegetation and transport sediment naturally.

While local fishers report positive sightings of the approximately 80 released reptiles, some researchers note that formal scientific proof of crocodile impact on mangrove health remains limited. Experts like Charlie Manolis of the IUCN Crocodile Specialist Group emphasize that while crocodile conservation is valuable, published studies have not yet verified that the reptiles are essential for mangrove survival.

Despite the need for further research, REVIVE continues expanding its efforts. At a former shrimp farm near Tuxpan, abandoned ponds now serve as natural breeding sites for wild crocodiles, laying the groundwork for future releases to support regional wetland recovery.