Seasonality, Environmental Factors, and Host Behavior Linked to Disease Risk in Stream-Dwelling Tadpoles

Author(s)

Valencia-Aguilar, Anyelet ^[1] ; Vital, Marcos V. C. ^{[2, 3]} ; Mott, Tami ^{[2, 4]}

Affiliation

^[1] Univ Fed Alagoas, Inst Ciencias Biol & Saude, Programa Posgrad Diversidade Biol & Conservacao T, Caixa Postal 82, BR-57072970 Maceio, Alagoas - Brazil

^[2] Univ Fed Alagoas, Inst Ciencias Biol & Saude, Setor Biodiversidade, Caixa Postal 82, BR-57072970 Maceio, Alagoas - Brazil

^[3] Univ Estadual Campinas, Inst Biol, Dept Biol Anim, Lab Hist Nat Anfibios Brasileiros LaHNAB, Caixa Postal 19, BR-13083862 Sao Paulo - Brazil

^[4] Univ Fed Alagoas, Museu Hist Nat, Setor Zool, Caixa Postal 82, BR-57051090 Maceio, Alagoas - Brazil

• Document type: Journal article
• Source: Herpetologica; v. 72, n. 2, p. 98-106, JUN 2015.
• Web of Science Citations: 6

Abstract

The aquatic pathogen Batrachochytrium dendrobatidis (Bd) can cause declines in amphibian populations and species extinctions worldwide. In tadpoles, epizootic events have not been reported; however, there is a possibility for rapid spread of disease in water. Here, we quantified Bd infection dynamics in tadpoles from two streams in the northeastern Atlantic forest of Brazil. Bd prevalence varied seasonally and increased during the rainy season. Aplastodiscus sibilatus and Proceratophrys renalis tadpoles were Bd positive in both seasons, whereas Agalychnis granulosa tadpoles were Bd positive only during the rainy season. Bd prevalence was higher in A. sibilatus than in A. granulosa and P. renalis. We found that larger individuals have a higher probability of being Bd positive, independent of the developmental stage. Moreover, we found that canopy cover, water flow, water temperature, water depth, and pH were associated with Bd prevalence. Our results highlight the fact that tadpoles can serve as pathogen reservoirs; therefore, monitoring anuran larvae populations in these habitats can enhance the impact assessment of this pathogen in biodiversity hot spots. (AU)

• FAPESP's process: 14/23388-7 - Comunication and sensory systems of the anurans of the Atlantic Forest
• Grantee: Luis Felipe de Toledo Ramos Pereira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/51694-7 - Into the heart of an epidemic: a US-Brazil collaboration for integrative studies of the amphibian-killing fungus in Brazil
• Grantee: Luis Felipe de Toledo Ramos Pereira
• Support Opportunities: Regular Research Grants