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Biological Invasions

, Volume 19, Issue 6, pp 1781–1794 | Cite as

Unraveling the historical prevalence of the invasive chytrid fungus in the Bolivian Andes: implications in recent amphibian declines

  • Patricia A. BurrowesEmail author
  • Ignacio De la Riva
Original Paper

Abstract

We studied the historical prevalence of the invasive and pathogenic chytrid fungus Batrachochytrium dendrobatidis (Bd) among amphibians from the Bolivian Andes. Our aim was also to determine its geographic pattern of dispersion, and a potential host taxonomic signature. We collected frog tissue samples from nine museum collections covering a period from 1863 to 2005 and from the field during 2009–2016. Bd was diagnosed via quantitative PCR in 599 individuals of 17 genera and 54 species. We found an overall Bd prevalence of 41% among 44 species tested. The first incidence of Bd was from a Telmatobius culeus in 1863; this is the earliest report of detection for this pathogen in the world. Results reveal a non-random historical and geographical pattern of Bd occurrence and amphibian declines that suggests the presence of two different invasive strains, an ancient endemic and a more recent introduction. Prevalence of Bd increased significantly by the mid-1990s, particularly in the cloud-forests, and this is coincident with the timing of drastic amphibian declines. In contrast, amphibians occurring in drier altiplano habitats have persisted in spite of Bd presence. We hypothesize that the early 1990s, and the cloud-forests in central Bolivia were the center of an epidemic surge of Bd that took its toll on many species, especially in the genus Telmatobius. Further sampling of cloud-forest species, and ongoing genetic studies of Bd isolates from Bolivia should help resolve the history of this invasive pathogen and test hypotheses on the differential response of endangered hosts.

Keywords

Amphibians Batrachochytrium dendrobatidis Invasive pathogen 

Notes

Acknowledgements

This research was supported by Projects CGL2011-30393 and CGL2014-56160-P of the Spanish Government (PI, Ignacio De la Riva). We are thankful to J. Aparicio (CBF), A. Muñoz (MHNC), L. Aguirre (CBG), L. Gonzáles (MNK), M. Calvo (MNCN), J. Cabot and T. García-Díez (EBD), D. Frost and D. Kizirian (AMNH), R. M. Brown (KU), and J. M. Padial (CM), for allowing us to sample amphibians in the Museum collections that they curate. We also thank O. Jiménez-Robles (MNCN) for drawing the map of Bolivia, and former University of Puerto Rico students, A. R. González J. López and M. C. Martes for their help with laboratory work and in entering the data in a perfectly organized spreadsheet. A. Pessier kindly checked our histology preparations of Telmatobius culeus skin.

Supplementary material

10530_2017_1390_MOESM1_ESM.pdf (250 kb)
Supplementary material 1 (PDF 250 kb)
10530_2017_1390_MOESM2_ESM.pdf (63 kb)
Supplementary material 2 (PDF 62 kb)

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.Department of BiologyUniversity of Puerto RicoSan JuanUSA
  2. 2.Museo Nacional de Ciencias NaturalesCSICMadridSpain

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