What If Gone

Species → Axolotl

Axolotl

Ambystoma mexicanum

Density fell from 6,000 individuals per km² in 1998 to about 100 per…
Extinction risk Critically Endangered
Specialist predatorConservationNear-extinction
Axolotl (Ambystoma mexicanum)
Photo: Ruben Undheim, Wikimedia Commons (CC BY-SA 2.0)

What if it disappeared?

Impact High
Over 16 years, Xochimilco

Axolotl density collapsed by more than 99% in sixteen years within its one natural habitat — from 6,000 individuals per km² in 1998 to fewer than 35 in 2014 — under the combined pressure of pollution, habitat loss, and two introduced fish, carp and tilapia, which prey on eggs and juveniles.

Documented
Detail

Voss, S.R., Woodcock, M.R. et Zambrano, L. (2015). A Tale of Two Axolotls. BioScience, 65(12), 1134–1140.

The authors compile successive censuses conducted across the Xochimilco canal network, the species' only known wild habitat. The axolotl remains, at the same time, one of the most studied laboratory model organisms in the world for its regenerative ability — a stark contrast between its abundance in captivity and its near-disappearance in the wild.

Since 2009, Xochimilco

A program of refuges built into chinampas — traditional floating agricultural plots — has, over fifteen years, rehabilitated 40 chinampas and built 36 refuges and 71 biofilters that exclude exotic fish and improve water quality.

Documented
Detail

Laboratorio de Restauración Ecológica, Instituto de Biología, UNAM (coordonné par Luis Zambrano) — projet de chinampas-refuges, rapporté par Mongabay (mai 2024).

The program combines ecological restoration with traditional agriculture: 12 hectares replanted, 228 direct beneficiaries (chinampero families), and 912 indirect ones. The team aims for about 400 rehabilitated chinampas within fifteen years — a target that, even if reached, would still fall well short of the historic scale of the Xochimilco system.

Not measured to date

The axolotl is a specialist predator at the top of its canal network, but no study measures what its near-disappearance has changed for the prey it regulated or for Xochimilco's food chain — available research covers its collapse and restoration programs, not its functional role.

Insufficient

Documentation

Last verified: August 14, 2026