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The effects of salinity, pH and temperature on the half-life and longevity of Echinostoma caproni miracidia

Published online by Cambridge University Press:  05 June 2009

D.M. Ford ,
P.M. Nollen  and
M.A. Romano
D.M. Ford
Affiliation:
Department of Biological Sciences, Western Illinois University, Macomb, IL 61455, USA
P.M. Nollen*
Affiliation:
Department of Biological Sciences, Western Illinois University, Macomb, IL 61455, USA
M.A. Romano
Affiliation:
Department of Biological Sciences, Western Illinois University, Macomb, IL 61455, USA
*
*Author for correspondence. Fax: 309 298 2770 E-mail: pm-nollen@wiu.edu
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Abstract

Miracidia of Echinostoma caproni were exposed to solutions varying in salinity, pH, and temperature in 1 ml concavity slides. Half-lives of the miracidial populations were determined and longevity curves constructed to find maximum life spans of the miracidia in the different conditions. Control miracidia in aquarium water at pH 7.2 and 22°C. had a half-life of 3.6 h and a maximum life span of 9 h. Miracidia of E. caproni were not very tolerant of saline solutions from 0.1% to 0.4%, the latter being lethal within an hour. A bimodal effect was found with exposure to aquarium water of varying pH, with a peak at pH 5 in acid solutions and pH 9 in alkaline solutions. Miracidia tolerated pH ranges from 3 to 11 exhibiting half-lives of 2.4 h or greater in these solutions. At lower than ambient temperatures, E. caproni miracidia lived longer, the greatest being a half-life of 5.0 h and a maximum life span of 15h at 5°C. At warmer temperatures, the half-life was reduced until lethality was reached at 40°C. ANCOVA analysis of log transformed longevity curves supported the observation that in pH trials many miracidia survived initially with a major die-off after 3.3 h. The opposite trend of early die-off and gradual mortality of the survivors was supported in the temperature trials.

Type
Research Papers
Information
Journal of Helminthology , Volume 72 , Issue 4 , December 1998 , pp. 325 - 330
Copyright
Copyright © Cambridge University Press 1998

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