ESR 32:429-436 (2017)  -  DOI: https://doi.org/10.3354/esr00821

Habitat characterization, occupancy and detection probability of the Endangered and endemic Junín giant frog Telmatobius macrostomus

Andrew S. Watson1,*, Austin L. Fitzgerald1, Oscar J. Damián Baldeón2, Roberto K. Elías3,4

1Peace Corps Community-Based Environmental Management Program, Surco, Vía Láctea 132, Urb. Los Granados, Surco Lima 33, Peru
2Servicio Nacional de Áreas Naturales Protegidas por el Estado del Perú, Reserva Nacional de Junín, Jr. San Martín N° 138, Lado Oeste, Junín, Peru
3Denver Zoological Foundation, 2300 Steele Street, Denver, Colorado 80205, USA
4Universidad Peruana Cayetano Heredia, Av. Honorio Delgado 430, San Martín de Porres, Lima, Peru
*Corresponding author:

ABSTRACT: The Junín giant frog Telmatobius macrostomus (Peters, 1873) is an Endangered and endemic frog in the central Andes of Peru. However, no quantitative ecological data exist to facilitate characterization of T. macrostomus habitat, nor do estimates of occupancy and detection probability, all of which are vital to inform appropriate management decisions. We present novel data on the current distribution and habitat of T. macrostomus in 3 natural protected areas in the regions of Junín and Pasco, Peru. To provide a general description of the areas where T. macrostomus occurred and did not occur, we measured a variety of physical, chemical, and biological conditions. We found T. macrostomus in fewer than half the streams surveyed for an estimated occupancy and detection probability of 0.40 ± 0.11 SE and 0.84 ± 0.06 SE, respectively. Akaike’s information criterion (AIC) indicates that of the 20 single-variable models constructed during this study, 5 were substantially associated with T. macrostomus occurrence (Δ corrected AIC [ΔAICc] < 2). The % Chironomidae metric of benthic macroinvertebrate communities at sampled sites best predicted the occurrence of T. macrostomus, followed by pH. Specific conductance, % silt and rainbow trout Oncorhynchus mykiss were also associated with T. macrostomus occurrence. Although the most parsimonious multi-variable occupancy model only included % Chironomidae, pH and rainbow trout as predictive variables of T. macrostomus occurrence, the other single-variable models with apparent influence over T. macrostomus occurrence may also be used to identify adequate areas for Junín giant frog conservation.


KEY WORDS: Detection probability · Endangered amphibians · Habitat · Junín giant frog · Occupancy · Telmatobius macrostomus · Wildlife conservation


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Cite this article as: Watson AS, Fitzgerald AL, Damián Baldeón OJ, Elías RK (2017) Habitat characterization, occupancy and detection probability of the Endangered and endemic Junín giant frog Telmatobius macrostomus. Endang Species Res 32:429-436. https://doi.org/10.3354/esr00821

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