Document Detail

Long-term analysis of Charlie's Pond: fecundity and trematode communities of Helisoma anceps.
MedLine Citation:
PMID:  18314674     Owner:  NLM     Status:  MEDLINE    
Charlie's Pond (North Carolina) harbors a diverse community of trematodes that infect the planorbid snail Helisoma anceps. Research at the Pond began in 1984 and serves as a foundation on which to investigate long-term changes in trematode communities. In 2002, 2005, and 2006 average size and fecundity of H. anceps were calculated each month, and seasonal trends analyzed with randomization tests. Concomitantly, trematode infections were recorded, and the community composition compared to those from previous studies. Helisoma anceps in 2002, 2005, and 2006 were smaller and less fecund than snails in 1984. The trematode community was consistently diverse, with 11 species recovered in 2006 versus 7 in 1984. However, the prevalence of Halipegus occidualis was much lower than previously observed (60% in 1984) and never exceeded 20% during the latter years. The decline of emergent vegetation is likely contributing to these changes. Aquatic macrophytes increase the surface area for growth of periphyton, the food source of these snails. Limited food supplies result in lower snail growth rates and fecundity. Similarly, emergent vegetation creates foci of transmission for H. occidualis between the frog definitive host and the snail intermediate host. When these areas are lost from the Pond, probability of transmission is reduced, and prevalence in the snail declines.
N J Negovetich; G W Esch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of parasitology     Volume:  93     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2008-03-04     Completed Date:  2008-03-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1311-8     Citation Subset:  IM    
Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109, USA.
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MeSH Terms
Fresh Water
North Carolina
Plants / growth & development
Random Allocation
Snails / parasitology*,  physiology*
Trematoda / classification*,  isolation & purification

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