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Mortality of American Bullfrog Tadpoles Lithobates catesbeianus Infected by Gyrodactylus jennyae and Experimentally Exposed to Batrachochytrium dendrobatidis.
MedLine Citation:
PMID:  23290030     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Abstract The fungal pathogen Batrachochytrium dendrobatidis (Bd), which causes the disease chytridiomycosis in postmetamorphic amphibians, has been linked to amphibian population declines. Different amphibian species, however, exhibit different susceptibility to Bd pathogenicity. At the same time, agricultural pesticides commonly found contaminating aquatic habitats have been reported to increase the susceptibility of amphibians to pathogens. To investigate whether certain pesticides are able to alter the pathogenicity of Bd to larval amphibians, we exposed larval American bullfrogs Lithobates catesbeianus to end-use formulations of the herbicides atrazine or glyphosate, and then exposed them to Bd. Following the experimental exposures, a preexisting infection of the tadpoles by the monogenean ectoparasite Gyrodactylus jennyae was detected in all experimental and control tadpoles. Gyrodactylus jennyae infection intensity varied, and individuals with heavy G. jennyae infections suffered more skin erosion due to grazing by the parasite. Tadpoles experimentally exposed to Bd, or to Bd and either herbicide, had significantly reduced survival rates compared with untreated tadpoles that were only infected by G. jennyae. Increased mortality was also correlated with degree of skin erosion; survival of tadpoles with severe skin erosion was significantly reduced compared with that of tadpoles with no, or mild, skin erosion. While infected with G. jennyae, the group of tadpoles with the lowest survival rate (exposed only to Bd) included significantly more individuals exhibiting severe skin erosion and significantly fewer individuals without skin erosion, compared with the control group. These results emphasize the potential pathogenicity of gyrodactylid infections in larval amphibian hosts and suggest that concomitant exposures to Bd may enhance infections and effects of G. jennyae in bullfrog tadpoles. Received February 3, 2012; accepted August 10, 2012.
Authors:
Linda J Paetow; J Daniel McLaughlin; Bruce D Pauli; David J Marcogliese
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of aquatic animal health     Volume:  25     ISSN:  0899-7659     ISO Abbreviation:  J. Aquat. Anim. Health     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-01-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9884881     Medline TA:  J Aquat Anim Health     Country:  United States    
Other Details:
Languages:  eng     Pagination:  15-26     Citation Subset:  IM    
Affiliation:
a Department of Biology , Concordia University , 7141 Sherbrooke Street West , Montreal , Quebec , H4B 1R6 , Canada.
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