Gui Becker

Gui  Becker

Assistant Professor

Office Hours

By appointment


  • Ph.D., Ecology and Evolutionary Biology, Cornell University, 2014
  • Postdoctoral research: State University of Sao Paulo, Brazil, 2017

Research Interests

My research interests fall at the interface of wildlife epidemiology and spatial ecology, including detailed mechanistic studies of diversity-disease relationships, ecology of host microbiome, host-pathogen responses to abiotic factors, and the connectivity and dispersal of animal populations. I build spatial models and conduct both field and laboratory experiments to understand the biotic and abiotic mechanisms underlying the distribution of wildlife from local to global scales, with the overarching goal of diagnosing patterns of biodiversity threats and loss. My research is divided into four broad areas of investigation: 1) disease ecology, 2) spatial analyses of genotypes and phenotypes, 3) effects of habitat alteration on population demographics, and 4) application of ecological findings to conservation.

Selected Publications

Greenspan SE, Migliorini GH, Lyra ML, Pontes MR, Carvalho T, Ribeiro LP, Moura-Campos D, Haddad CFB, Toledo LF, Romero GQ, Becker CG (2020) Warming drives ecological community changes linked to microbiome dysbiosis. Nature Climate Change, in press.

Preuss J, Greenspan SE, Rossi EB, Lucas Gonsales EM, Neely WJ, Valliati, Woodhams D, Becker CG*, Tozetti AM*. Widespread pig farming practice linked to shifts in skin microbiomes and disease in pond-breeding amphibians. Environmental Science & Technology, in press. *authors contributed equally.

Nali R, Becker CG, Zamudio KZ, Prado CP. (2020) Topography, more than land cover, explains genetic diversity in a Neotropical Savanna treefrog. Diversity & Distributions, in press.

Neely WJ, Greenspan SE, Ribeiro LP, Carvalho T, Martins R, Rodriguez D, Rohr JR, Haddad CFB, Toledo LF, Becker CG (2020) Synergistic effects of warming and disease linked to high mortality in cool-adapted terrestrial frogs. Biological Conservation, 2545: 108521.

Ribeiro Jr. JW, Siqueira T, Direnzo G, Lambertini C, Toledo LF, Haddad CFB, Becker CG (2020) Assessing infection risk in tropical amphibians while accounting for imperfect detection of Batrachochytrium dendrobatidis. Oecologia, 193: 237–248.

Woodhams DC, Bletz MC, Becker CG, Bender HA, Buitrago-Rosas D, Diebboll H, Huynh R, Kearns PJ, Kueneman J, Kurosawa E, LaBumbard BC, Lyons C, McNally K, Schliep K, Shankar N, Tokash-Peters A, Vences M, Whetsone R (2020) Host Associated Microbiomes Predicted by Immune System Complexity and Climate. Genome Biology, 21: 23.

Martins RA, Becker CG, Haddad CFB, Yvonnick LP, Sole M, Mira-Mendes CV (2020) Redescription of the tadpole of Leptodactylus flavopictus Lutz, 1926 (Anura: Leptodactylidae) from Pilar do Sul, São Paulo, Brazil. Zootaxa, 4722: 495-499.

Becker CG, Bletz MC, Greenspan SE, Rodriguez D, Lambertini C, Jenkinson TS, Guimaraes PR, Assis P, Geffers R, Jarek M, Toledo LF, Vences M, Haddad CFB (2019) Low-load pathogen spillover predicts shifts in skin microbiome and survival of a terrestrial-breeding amphibian. Proceedings of the Royal Society of London – B, 286: 20191114.

Greenspan SE, Lyra ML, Migliorini GH, Kersch-Becker MF, Bletz MC, Lisboa CS, Pontes MR, Ribeiro LP, Neely W, Rezende F, Romero GQ, Woodhams DC, Haddad CFB, Toledo LF, *Becker CG (2019) Arthropod–bacteria interactions influence assembly of aquatic host microbiome and pathogen defense. Proceedings of the Royal Society of London – B, 286: 20190924. *corresponding author

Kuenemann J, Bletz M, McKenzie V, Becker CG, Joseph M, et al. (2019) Community richness of amphibian skin bacteria correlates with bioclimate at the global scale. Nature Ecology & Evolution, 3: 381–389.

Ribeiro L, Carvalho T, Becker CG, Jenkinson TS, Leite DL, James TY, Greenspan SE, Toledo LF (2019) Bullfrog farms release virulent zoospores of the frog-killing fungus into the natural environment. Scientific Reports, 9: 13422.

Greenspan SE, Lambertini C, Carvalho T, James TY, Toledo LF, Haddad CFB, *Becker CG (2018) Hybrids of amphibian chytrid show high virulence in native hosts. Scientific Reports, 8: 9600. *corresponding author

Becker CG, Longo AV, Haddad CFB, Zamudio KR (2017) Land cover and forest connectivity alter the interactions among host, pathogen, and skin microbiome, Proceedings of the Royal Society of London – B, 284: 20171861.

*Carvalho T, *Becker CG, Toledo LF (2017) Historical amphibian declines and extinctions in Brazil linked to chytridiomycosis, Proceedings of the Royal Society of London – B, 284: 20162254. *authors contributed equally.

Mesquita AC, Lambertini C, Toledo LF, Lira M, Malagoli LR, Haddad CFB, *Becker CG (2017) Low Resistance to chytidiomycosis in direct-developing amphibians; Scientific Reports; 7: 16605. *corresponding author.

Forti L, Becker CG, Tacioli L, Santos A, Oliveira I, Haddad CFB, Toledo LF (2017) Perspectives on invasive amphibians in Brazil, PLoS One, 12: e0184703.

Becker CG, Greenspan SE, Tracy KE, Dash JA, Lambertini C, Jenkinson TS, Leite DS, Toledo LF, Longcore JE, James TY, Zamudio KR (2017) Variation in phenotype and virulence among enzootic and panzootic amphibian chytrid lineages, Fungal Ecology, 26: 45-50.

Polato N, Gray MM, Gill BA, Anderson KL, Becker CG, Encalada AC, Funk WC, Zamudio KR (2017). Genetic diversity and gene flow decline with elevation in montane mayflies, Heredity, 119: 107-116.

Lambertini C, Becker CG, Bardier C, Leite DS, Toledo LF (2017) Widespread infections of Batrachochytrium dendrobatidis in South American caecilians; Diseases of Aquatic Organisms, 10.3354/dao03114.

Becker CG, Rodriguez D, Lambertini C, Toledo LF, Haddad CFB (2016) Historical dynamics of Batrachochytrium dendrobatidis in Amazonia, Ecography, 39: 954-960.

Bovo RP, Andrade DV, Toledo LF, Longo AV, Rodriguez D, Haddad CFB, Zamudio KR, Becker CG (2016) Responses of Brazilian amphibians to an enzootic infection of the frog-killing fungus. Diseases of Aquatic Organisms, 17: 245-252.

Lambertini C, Becker CG, Jenkinson TS, Rodriguez D, Leite DS, James TY, Zamudio KR, Toledo LF (2016) Local phenotypic variation in amphibian-killing fungus predicts infection dynamics. Fungal Ecology, 20: 15-21.

Becker CG, Rodriguez D, Longo AV, Toledo LF, Haddad CFB, Zamudio KR (2016) Deforestation, host community structure, and amphibian disease risk. Basic and Applied Ecology, 17: 72-80.

Savage AE, Becker CG, Zamudio KR (2015) Linking genetic and environmental factors in amphibian disease risk. Evolutionary Applications, 8: 560-572.

Becker CG, Rodriguez D, Toledo LF, Longo AV, Lambertini C, Correa DT, Leite DS, Haddad CFB, Zamudio KR (2014) Partitioning the net effect of host diversity on an emerging amphibian pathogen. Proceedings of the Royal Society of London – B, 281: 20141796.

Titus V, Bell RC, Becker CG, Zamudio KR (2014) Connectivity and gene flow among Eastern Tiger Salamander (Ambystoma tigrinum) populations in highly modified anthropogenic landscapes. Conservation Genetics, 15: 1447-1462.

Lenker M, Savage AE, Becker CG, Rodriguez DR, Zamudio KR (2014) Batrachochytrium dendrobatidis infection dynamics vary seasonally in Upstate New York. Diseases of Aquatic Organisms, 111: 51-60.

Toledo LF, Becker CG, Haddad CFB, Zamudio KR (2014) Rarity in Amphibians: Indicators of Endangerment in a Biodiversity Hotspot. Biological Conservation, 179: 54-62.

Rodriguez D, Becker CG, Pupin N, Haddad CFB, Zamudio KR (2014) Long-term endemism of two highly divergent lineages of the amphibian-killing fungus in the Atlantic Forest of Brazil. Molecular Ecology, 23: 774-787.

Becker CG, Dalziel BD, Becker MFK, Park MG, Mouchka M (2013) Indirect effects of human development along the coast on coral health. Biotropica, 45: 401-407.

Becker CG, Rodriguez D, Zamudio KR (2013) The Brazilian Adirondacks? Science (Letters), 340: 428.

Larson EL, Becker CG, Bondra ER, Harrison RG (2013) Structure of a mosaic hybrid zone between the field crickets G. firmus and G. pennsylvanicus. Ecology & Evolution, 3: 985-1002.

Becker CG, Rodriguez D, Longo AV, Talaba A, Zamudio KR (2012) Disease risk in temperate amphibian populations is higher at closed-canopy sites. PLoS One, 7: e48205.

Becker CG, Zamudio KR (2011) Tropical amphibian populations experience higher disease risk in natural habitats. Proceedings of the National Academy of Sciences of the United States of America, 118: 9893-9898.

Velo-Anton G, Becker CG, Rivera AC (2011) Turtle carapace anomalies: the roles of genetic diversity and environment. PLoS One, 6:e18714.

Becker CG, Fonseca CR, Haddad CFB, Prado PI (2010) Habitat split as a cause of local population declines of amphibians with aquatic larvae. Conservation Biology, 24: 287-294.

Becker CG, Loyola RD, Haddad CFB, Zamudio KR (2010) Integrating species life-history traits and patterns of deforestation in amphibian conservation planning. Diversity and Distributions, 16: 10-19.

Fonseca CR, Ganade G, Baldissera R, Becker CG, Boelter C, et al. (2009) Towards an ecologically sustainable forestry in the Atlantic Forest. Biological Conservation, 142: 1209-1219.

Becker CG, Loyola RD (2008) Extinction risk assessments at the population and species level: implications for amphibian conservation. Biodiversity and Conservation, 17: 2239-2304.

Fonseca CR, Becker CG, Haddad CFB, Prado PI (2008) Response to comment on: habitat split and the global decline of amphibians. Science, 320: 874.

Loyola RD, Becker CG, Kubota U, Fonseca CR, Haddad CFB, Lewinsohn TM (2008) Hung Out to dry: choice of priority ecoregions for conserving threatened Neotropical anurans depends on life-history traits. PLoS One, 3(6): e2120.

Fonseca CR, Becker CG, Haddad CFB, Prado PI (2008) Metamorfose.                       Scientific American (Perspective; in Portuguese), 3: 88-93.

Becker CG, Fonseca CR, Haddad CFB, Batista RF, Prado PI (2007) Habitat split and the global decline of amphibians. Science, 318: 1775-1777.

Becker CG, Joner F, Fonseca CR (2007) Ecologically-sustainable tree monocultures contribute to the conservation of an Araucaria Forest endemic frog. Journal of Natural History, 41: 1739-1752.