This species occurs on the Amazonian slopes of the eastern Andes in Napo Province, Ecuador (at elevations of 1,310-1,700m asl) and in Ayacucho Province, southern Peru. The Peruvian specimens might refer to a distinct species (Duellman and Schülte, 1993). A similar form occurs in Putumayo Department, Colombia; however, further collections are required for taxonomic confirmation of this population (Mueses-Cisneros, 2005).
Habitat and Ecology
It lives near streams in pre-montane forest (Lynch and Duellman 1973; QCAZ database). It lays its eggs on vegetation, and the tadpoles develop in the water.
In Ecuador, it has disappeared from the type locality (Río Salado) and several other localities, but one specimen was seen in Azuela in 1998.
Habitat destruction and degradation is a threat to this species, due mainly to the activities of smallholder farmers and as a result of logging. Given its narrow altitudinal range, its decline in Ecuador might be related to the impacts of climate change.
It occurs in the Reserva Ecológica Cayambe-Coca in Ecuador.
Luis A. Coloma, Santiago Ron, Diego Cisneros-Heredia 2010. Nymphargus siren. In: IUCN 2014