This species occurs on the Pacific slopes of the Andes in southern Colombia (in Nariño and Cauca Departments) and widely in western Ecuador, from 500-2,000m asl.
Habitat and Ecology
It lives on vegetation inside lowland and montane forests, usually very close to streams. Specimens have been found calling from vegetation over, and boulders in, cascading mountain streams. It can survive in secondary forest if vegetation persists around streams. The eggs are deposited among rocks at the water's edge, and the larvae develop in streams.
It is locally very common in suitable habitats.
The major threat is habitat loss due to agricultural development (including cultivation of illegal crops), logging, and human settlement, and pollution resulting from the spraying of illegal crops. It is probably also affected by the introduction of exotic fish species, pollution from agriculture, and droughts.
In Ecuador, its geographic range overlaps with the Reserva Ecológica Los Illinizas and the Reserva Ecológica Manglares Churute. In Colombia it has been recorded from Parque Nacional Natural Farallones de Cali.
This species was previously within the genus Hyla but has recently been moved to the resurrected genus Hyloscirtus (Faivovich et al. 2005).
Wilmar Bolívar, Luis A. Coloma, Santiago Ron, Diego Cisneros-Heredia, Karl-Heinz Jungfer 2004. Hyloscirtus alytolylax. In: IUCN 2014