Dendropsophus juliani is known from the vicinity of the settlement of Barracón, on the road from Cobija to Riberalta, 11 33’ S, 66 56’ W, 160 masl, Province of Madre de Dios, Department of Pando, Bolivia. In 2007 its call was heard also in the vicinity of the community of Palmira, 10 35´S, 65 44´W, Province of Federico Román, Department of Pando, Bolivia (Moravec et al., in prep.). It is also possible that a population in the northern Department of Santa Cruz may be D. juliani (Moravec et al., 2006).
Habitat and Ecology
The type locality is located in an alluvial plain of the small river Arroyo Jenichiquia. The area consists mostly of western Amazonian forest represented primarily by old secondary forest with many large emergent trees (e.g. Bertholletia excelsa, Dipteryx micrantha, Ficus schultesii, etc.), which were not selected for timber harvest 30–40 years ago. An important feature of the area is the presence of isolated pockets of open or overgrown pampas associated with poorly drained soils, which penetrate the closed forest. Males called from emergent grasses from small lakes or flooded depressions or from bushes over the water surface (ca. 5–50 cm above water). Nevertheless, single males were observed calling from bushes and young trees up to 250 cm above the ground and a chorus of males was heard calling from dense bushes and trees growing on the banks of Arroyo Jenichiquia (month of January). Calling activity started approximately a half hour before sunset. Other hylid species found in sympatry with D. juliani include Dendropsophus leucophyllatus, D. minutus, Hypsiboas boans, H. cinerascens, H. lanciformis, Phyllomedusa bicolor, P. camba, Scinax ruber and S. parkeri. Females and larvae of D. juliani are unknown (Moravec et al., 2006).
The species occurs in wet forest edges and open wet areas including disturbed habitats (e.g. sides of forest roads) (J. Moravec, pers. comm.).
Dendropsophus juliani was a relatively common species at the type locality (Moravec et al., 2006).
No major threats are known for this species.
No conservation measures are known for this species.
Tentatively placed in the Dendropsophus microcephalus group according to the original publication. Dendropsophus juliani is characterized by a combination of morphological and advertisement call features (Moravec et al., 2006).
Jiri Moravec 2008. Dendropsophus juliani. In: IUCN 2014