Synergistic effects of warming and disease linked to high mortality in cool-adapted terrestrial frogs

Author(s)

Neely, Wesley J. ^[1] ; Greenspan, Sasha E. ^[1] ; Ribeiro, Luisa P. ^[2] ; Carvalho, Tamilie ^[2] ; Martins, Renato A. ^[3] ; Rodriguez, David ^[4] ; Rohr, Jason R. ^[5] ; Haddad, Celio F. B. ^{[6, 7]} ; Toledo, Luis Felipe ^[2] ; Becker, C. Guilherme ^[1]

Affiliation

^[1] Univ Alabama, Dept Biol Sci, 1325 Sci & Engn Complex, 300 Hackberry Lane, Tuscaloosa, AL 35487 - USA

^[2] Univ Estadual Campinas UNICAMP, Dept Biol Anim, BR-13083862 Campinas, SP - Brazil

^[3] Univ Fed Sao Carlos, Ctr Ciencias Biol & Saude, BR-13565905 Sao Carlos, SP - Brazil

^[4] Texas State Univ, Dept Biol, San Marcos, TX 78666 - USA

^[5] Univ Notre Dame, Dept Biol Sci, Notre Dame, IL 46556 - USA

^[6] Univ Estadual Paulista UNESP, Inst Biociencias, Dept Biodiversidade, BR-13506900 Rio Claro, SP - Brazil

^[7] Univ Estadual Paulista UNESP, Ctr Aquicultura CAUNESP, BR-13506900 Rio Claro, SP - Brazil

• Document type: Journal article
• Source: Biological Conservation; v. 245, MAY 2020.
• Web of Science Citations: 0

Abstract

Cool-adapted species inhabiting montane tropical forests are vulnerable to heat stress associated with climate warming. According to the thermal mismatch hypothesis, pathogens are predicted to have broader thermal tolerances than their hosts, which can lead to increased pathogen loads and host mortality when temperatures are outside hosts' thermal optima. We tested the thermal mismatch hypothesis in two habitat generalist species expected to have wide thermal tolerance ranges: Dendropsophus minutus captured at a high elevation and D. elegans captured at a warmer low elevation. We also tested high-elevation individuals of the Brazilian direct-developing species Ischnocnema parva, which are expected to have a narrow thermal tolerance range based on life history. We exposed all frogs to the pathogenic fungus Batrachochytrium dendrobatidis (Bd) under three temperatures ranging from the average nighttime temperature where frogs were collected (16 and 21 degrees C for high and low elevations, respectively) to a simulated warming event (26 degrees C). Bd loads across all three host species were negatively associated with temperature. However, the interaction between Bd infection and warming led to increased mortality in cool-adapted I. parva at higher temperatures, despite lower infection loads. Our results indicate that Bd may lead to declines of cool-adapted montane frogs under the combined pressures of pathogen infection and warming, even at temperatures approaching the pathogen's upper thermal limit. Thus, climatic warming at a level that lowers fitness of heat-sensitive pathogens may not uniformly reduce host disease risk. (AU)

• FAPESP's process: 18/23622-0 - Implications of national and international bullfrog trade in spread and tolerance acquired to chytrid fungus and conservation measures of anurans
• Grantee: Luisa de Pontes Ribeiro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/25358-3 - The chytrid fungus: from its origins to its consequences
• Grantee: Luis Felipe de Toledo Ramos Pereira
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/50741-7 - Diversity and conservation of Brazilian amphibians
• Grantee: Célio Fernando Baptista Haddad
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 16/03344-0 - Frog farms in the state of São Paulo and its relationship with amphibian chytrids and conservation
• Grantee: Luisa de Pontes Ribeiro
• Support Opportunities: Scholarships in Brazil - Master