Little Stick Chameleons, Big Stakes: Assessing Wild Populations of Madagascar’s Traded Reptiles

Madagascar is globally celebrated for its exceptional biodiversity, serving as a vital sanctuary for unique reptiles, including dwarf chameleons from the genera Brookesia and Palleon, commonly known as stick chameleons. Despite their ecological importance, several of these tiny species are legally harvested for the international pet trade. Ensuring that this commercial harvest remains sustainable requires accurate population data to support the Non-Detriment Findings (NDFs) mandated by CITES.

A recent study examined the population status, densities, and microhabitat roost characteristics of three heavily traded stick chameleon species (Brookesia superciliaris, Brookesia thieli, and Brookesia ebenaui) outside official protected areas in Central-Eastern Madagascar. Conducted across two mid-altitude rainforest fragments (Ampitambe and Fierenana) using nocturnal distance sampling, the survey documented eight total chameleon species.

Population densities varied notably among the target species, with B. superciliaris showing the highest abundance at roughly 29.77 individuals per hectare, while B. thieli and B. ebenaui recorded lower densities. The findings indicated that demographic structures were heavily adult-skewed (approximately 89%), and microhabitat preferences—such as perch height and branch diameter—frequently differed significantly between sexes and species.

The authors emphasize that lower population densities outside protected zones highlight the pressing vulnerabilities caused by habitat disturbance and edge effects. Consequently, the study recommends refined trade management, careful export quota calculations, and long-term monitoring programs to balance economic incentives with the ultimate preservation of Madagascar's remarkable herpetofauna.

References

Andriantsimanrilafy, Rodlis Raphali, Elisoa Fidéline Hantalalaina, Attale Ravaoarimalala, Jean Claude Razafimampandrà, Fabien Zakiàs Benedicte, Kandriamialinison, and Eric Robsomanitrandrasuna. 2026. "Population status and roost characteristics of three traded dwarf chameleons outside protected areas in Central-Eastern Madagascar." Scientific Reports in Life Sciences 7(2): 18–29. DOI: https://doi.org/10.5281/zenodo.22981429.