Pulmonate snails (Helisoma anceps) of varying sizes were exposed to 2, 4, 8, or 16 eggs of Halipegus occidualis and observed over several months to determine the duration of the prepatent period. Infection probability was positively correlated with number of eggs ingested. The number of eggs ingested did not, however, have a significant effect on the duration of the prepatent period, presumably because low infectivity of the eggs (15%) dictated that most patent infections arose from a single miracidium. There was a significant, positive correlation between snail length (measured at time of exposure) and duration of prepatent period, suggesting that density-dependent effects are, in part, responsible for the initiation of cercariae production in H. occidualis.
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August 2000
RESEARCH NOTES|
August 01 2000
Snail Size as a Determinant of Prepatent Period Duration in Helisoma anceps Infected with Halipegus occidualis (Digenea: Hemiuridae)
Derek A. Zelmer;
Derek A. Zelmer
aDepartment of Biology, Wake Forest University, Winston–Salem, North Carolina 27109
bcurrent address: Division of Biological Sciences, Emporia State University, Emporia, Kansas 66801
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Gerald W. Esch
Gerald W. Esch
aDepartment of Biology, Wake Forest University, Winston–Salem, North Carolina 27109
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J Parasitol (2000) 86 (4): 891–893.
Citation
Derek A. Zelmer, Gerald W. Esch; Snail Size as a Determinant of Prepatent Period Duration in Helisoma anceps Infected with Halipegus occidualis (Digenea: Hemiuridae). J Parasitol 1 August 2000; 86 (4): 891–893. doi: https://doi.org/10.1645/0022-3395(2000)086[0891:SSAADO]2.0.CO;2
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