Fitness consequences of infection by Batrachochytrium dendrobatidis in northern leopard frogs (Lithobates pipiens)

Chatfield, Matthew W.H., Brannelly, Laura A., Robak, Matthew J., Freeborn, Layla, Lailvaux, Simon P., and Richards-Zawacki, Corinne L. (2013) Fitness consequences of infection by Batrachochytrium dendrobatidis in northern leopard frogs (Lithobates pipiens). EcoHealth, 10 (1). pp. 90-98.

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The amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd), has been linked to amphibian declines and extinctions worldwide. The pathogen has been found on amphibians throughout eastern North America, but has not been associated with mass die-offs in this region. In this study, we conducted laboratory experiments on the effects of Bd infection in a putative carrier species, Lithobates pipiens, using two estimators of fitness: jumping performance and testes morphology. Over the 8-week study period, peak acceleration during jumping was not significantly different between infected and uninfected animals. Peak velocity, however, was significantly lower for infected animals after 8 weeks. Two measures of sperm production, germinal epithelium depth, and maximum spermatic cyst diameter, showed no difference between infected and uninfected animals. The width, but not length, of testes of infected animals was significantly greater than in uninfected animals. This study is the first to show effects on whole-organism performance of Bd infection in post-metamorphic amphibians, and may have important long-term, evolutionary implications for amphibian populations co-existing with Bd infection.

Item ID: 30192
Item Type: Article (Research - C1)
ISSN: 1612-9210
Keywords: Batrachochytrium dendrobatidis, chytrid fungus, fitness, northern leopard frog, Lithobates pipiens, whole-organism performance
Funders: Louisiana Department of Wildlife and Fisheries
Date Deposited: 13 Nov 2013 05:27
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050202 Conservation and Biodiversity @ 33%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070206 Animal Reproduction @ 34%
06 BIOLOGICAL SCIENCES > 0605 Microbiology > 060502 Infectious Agents @ 33%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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