Andrés Valenzuela Sánchez

Area de Interés: Monitoreo de fauna, ecología de poblaciones, ecología de enfermedades, conservación de anfibios, conservación de tierras, educación y comunicación para la conservación, planificación para la conservación -

  • 2017 Doctor en Medicina de la Conservación, Universidad Andrés Bello, Chile 
  • 2011 Médico Veterinario, Universidad Andrés Bello, Chile



(CBIT 200) Programación y Análisis de Datos Ambientales Mediante Software Libre (Responsable)
(CBIT 225) Manejo y Monitoreo de Fauna Silvestre (Colaborador)



Steven N. Austad,Caleb E. Finch,How ubiquitous is aging in vertebrates?, Science, 376, 6600, (1384-1385), (2022). /doi/10.1126/science.adc9442


Valenzuela-Sánchez A, Azat C, Cunningham AA, Delgado S, Bacigalupe LD, Beltrand J, Serrano JM, Sentenac H, Haddow N, Toledo V, Schmidt BR, Cayuela H (2021) Interpopulation differences in male reproductive effort drive the population dynamics of a host exposed to an emerging fungal pathogen. Journal of Animal Ecology. DOI: 10.1111/1365-2656.13603

Valenzuela-Sánchez A, Wilber MQ, Canessa S, Bacigalupe LD, Muths E, Schmidt BR, Cunningham AA, Ozgul A, Johnson PTJ, & Cayuela H (2021) Why disease ecology needs life-history theory: a host perspective. Ecology Letters 24: 876–890.

Alvarado-Rybak, M., Acuña, P., Peñafiel-Ricaurte, A., Sewell, T. R., O'Hanlon, S. J., Fisher, M. C., Valenzuela-Sánchez, A., Cunningham AA, & Azat, C. (2021). Chytridiomycosis outbreak in a Chilean giant frog (Calyptocephalella gayi) captive breeding program: genomic characterization and pathological findings. Frontiers in Veterinary Science 8: 733357.

Alvarado-Rybak, M., Lepe-Lopez, M., Peñafiel-Ricaurte, A., Valenzuela-Sánchez, A., Valdivia, C., Mardones, F. O., ... & Azat, C. (2021). Bioclimatic and anthropogenic variables shape the occurrence of Batrachochytrium dendrobatidis over a large latitudinal gradient. Scientific reports 11: 17383.

Cabeza-Alfaro, O., Valenzuela-Sánchez, A., Alvarado-Rybak, M., Serrano, J. M., Azat, S. (2021) First case of male alloparental care in amphibians: tadpole stealing in Darwin’s frogs. Endangered Species Research 45: 331–335.

Perez-Venegas, D. J., Valenzuela-Sánchez, A., Montalva, F., Pavés, H., Seguel, M., Wilcox, C., & Galbán-Malagón, C. (2021). Towards understanding the effects of oceanic plastic pollution on population growth for a South American fur seal (Arctocephalus australis australis) colony in Chile. Environmental Pollution 279: 116881.

Azat C, Valenzuela-Sánchez A, Delgado S, Cunningham AA, Alvarado-Rybak M, Bourke J, ... & Ariadne A (2021) A flagship for Austral temperate forest conservation: an action plan for Darwin's frogs brings key stakeholders together. Oryx 55: 356–363.

Valenzuela-Sánchez A & Delgado S (2021) Descubriendo a la Ranita de Darwin. RiL Editores, Santiago, Chile.


Serrano JM, Penna M, Valenzuela-Sánchez A, Mendez MA & Azat C (2020) Monomorphic call structure and dimorphic vocal phenology in a sex-role reversed frog. Behavioral Ecology and Sociobiology 74: 1–13.

Cayuela H, Valenzuela-Sánchez A, Teulier L, Martínez-Solano Í, Léna J-P, Merilä J, Muths E, Shine R, Quay L, Denoël M, Clobert J, Schmidt BR (2020) Determinants and consequences of dispersal in vertebrates with complex life cycles: a review of pond-breeding amphibians. The Quarterly Review of Biology 95: 1–36.


Bacigalupe LD, Vásquez IA, Estay SA, Valenzuela-Sánchez A, Alvarado-Rybak M, Peñafiel-Ricaurte A, Cunningham AA, Soto-Azat C (2019) The amphibian-killing fungus in a biodiversity hotspot: Identifying and validating high-risk areas and refugia. Ecosphere 10:  e02724.

 Valenzuela-Sánchez A, Cayuela H, Schmidt BR, Cunningham AA, Soto-Azat C (2019) Slow natal dispersal across a homogeneous landscape suggests the use of mixed movement behaviours during dispersal in the Darwin's frog. Animal Behaviour 150: 77–86.

Valenzuela-Sánchez A, Schmidt BR, Pérez C, Altamirano T, Toledo V, Pérez Í, Teillier S, Cunningham AA, Soto-Azat C (2019) Assessing habitat quality when forest attributes have opposing effects on abundance and detectability: a case study on Darwin’s frogs. Forest Ecology and Management 432: 942–948.


Molina-Burgos BE, Valenzuela-Sánchez A, Alvarado-Rybak M, Klarian S, Soto-Azat C. (2018) Trophic ecology of the endangered Darwin’s frog inferred by stable isotopes. Endangered Species Research 36: 269–278.

Fisher MC et al. (2018) Development and worldwide use of a non-lethal and minimal population-level impact protocols for the isolation of chytrids from amphibians. Scientific Reports 8: 7772.

O'Hanlon SJ et al. 2018. Recent Asian origin of chytrid fungi causing global amphibian declines. Science 360: 621-627.

Alvarado-Rybak M, Valenzuela-Sánchez A, Cevidanes A, Peñafiel-Ricaurte A, Uribe-Rivera DE, Flores E, Cunningham AA, Soto-Azat C (2018) High prevalence of chigger mite infection in a forest-specialist frog with evidence of parasite-related granulomatous myositis. Parasitology Research 117: 1643–1646.

Valenzuela-Sánchez A, O’Hanlon S, Alvarado-Rybak M, Uribe-Rivera DE, Cunningham AA, Fisher MC, Soto-Azat C (2018) Genomic epidemiology of the emerging pathogen Batrachochytrium dendrobatidis from native and invasive amphibian species in Chile. Transboundary and Emerging Diseases 65: 309–314.

IUCN SSC Amphibian Specialist Group Chile (2018) Estrategia Binacional de Conservación de las Ranitas de Darwin. Santiago, Chile.


Valenzuela-Sánchez A, Schmidt BR, Uribe-Rivera DE, Costas F, Cunningham AA, Soto-Azat C (2017) Cryptic disease-induced mortality may cause host extinction in an apparently stable host–parasite system. Proceedings of the Royal Society B 284: 20171176.

Uribe-Rivera DE, Soto-Azat C, Valenzuela-Sánchez A, Bizama G, Simonetti JA, Pliscoff P (2017) Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog. Ecological Applications 27: 1633–1645


Valenzuela-Sánchez A, Cunningham AA & Soto-Azat (2015) Geographic body size variation in ectotherms: effects of seasonality on an anuran from the southern temperate forest. Frontiers in Zoology 12:37.

Soto-Azat C, Valenzuela-Sánchez A, Ortíz JC, Díaz-Páez H, Castro C, et al. (2015) ASG Chile Leads Update of the Extinction Risk of Chilean Amphibians for The IUCN Red List of Threatened Species. FrogLog 116:6-7.


Valenzuela-Sánchez A, Harding G, Cunningham AA, Chirgwin C, Soto-Azat C (2014) Home range and social analyses in a mouth brooding frog: testing the co-existence of paternal care and male territoriality. Journal of Zoology 294:215-223.

Valenzuela-Sánchez A & Medina-Vogel G (2014) Importancia de las enfermedades infecciosas para la conservación de la fauna silvestre amenazada de Chile. Gayana 78(1):41-53.


Soto-Azat C, Valenzuela-Sánchez A, Clarke BT, Busse K, Ortiz JC, Barrientos C & Cunningham AA (2013) Is chytridiomycosis driving Darwin's Frogs to extinction?. PloS ONE 8(11):e79862.

Soto-Azat C, Valenzuela-Sánchez A, Collen B, Rowcliffe MC Veloso A & Cunningham AA (2013) The population decline and extinction of Darwin’s frogs. PLoS ONE 8(6):e66957.


Valenzuela-Sánchez A & Soto-Azat C (2012) Productividad y Redes de Colaboración de la Herpetología en Chile. Boletín de Biodiversidad de Chile 7: 1–11.

Soto-Azat C & Valenzuela-Sánchez A (2012) Conservación de anfibios de Chile. Universidad Andrés Bello, Santiago, Chile.


2021-2022: Co-investigador principal proyecto “Darwin’s frogs as a flagship for Austral temperate forest conservation”. Financiado por The Weeden Foundation, EUA.  

2021: Investigador principal proyecto N° 202525666 “Integrating research, education, and action to save Darwin’s frogs and forest amphibians in Chile”. Financiado por The Mohamed Species Conservation Fund, Emiratos Árabes Unidos. 

2020-2021: Co-investigador principal proyecto “Preserving the habitat of the Darwin’s frog in Chile”. Financiado por The Weeden Foundation, EUA.  

2020-2021: Investigador principal proyecto N° 533352 “Descubriendo a la ranita de Darwin (RiL Editores)”. Financiado por el Fondo del Libro y la Lectura, Ministerio de la Cultura, las Artes y el Patrimonio, Chile. 

2019-2021: Investigador principal proyecto Nº NGS-61629C-19 “Leaping into action: saving southern Darwin’s frogs with evidence-based conservation”. Financiado por The National Geographic Society, EUA. 

2018-2022: Co-investigador principal Proyecto “Darwin’s frog Conservation Strategy”. Financiado por Zoo Leipzig, Alemania. 

2018-2019: Investigador principal proyecto N°23952-B “Leaping into action: research and mitigation against chytridiomycosis in the Darwin's frog”. Financiado por The Rufford Foundation, Reino Unido. 

2018-2020: Investigador principal FONDECYT postdoctorado N°3180107 “Spatial and temporal dynamics of an emerging multi-species host-parasite system”. Financiado por la Comisión Nacional de Investigación Científica y Tecnológica, Gobierno de Chile. 

2016-2017: Investigador principal proyecto N°19017-2 “Chytridiomycosis in the endangered Darwin's frogs: developing models for their conservation”. Financiado por The Rufford Foundation, Reino Unido. 

2016: Investigador principal proyecto Fondo creación literaria, género referencial, para la escritura del libro “Descubriendo a la Ranita de Darwin”. Financiado por Fondo del Libro, Consejo Nacional de la Cultura y las Artes, Chile.

2014-2015: Investigador principal proyecto N°14460-1 “Is Chytridiomicosis a Threat to the Mouth-Brooding Darwin’s Frog (Rhinoderma darwinii)? : A Disease Risk Assessment”. Financiado por The Rufford Foundation, Reino Unido. 

2014-2015: Investigador principal proyecto N° DI-582-14/I “Is Chytridiomicosis a Threat to the Mouth-Brooding Darwin’s Frog (Rhinoderma darwinii)?: A Disease Risk Assessment.” Financiado por la Vicerrectoría de Investigación y Doctorados, Universidad Andrés Bello, Chile.