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The effects of temperature on the distribution and establishment of Echinoparyphium recurvatum metacercariae in Lymnaea peregra

Published online by Cambridge University Press:  01 September 2007

N.J. Morley ,
M.E. Adam  and
J.W. Lewis
N.J. Morley*
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
M.E. Adam
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
J.W. Lewis
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
*
*E-mail: [email protected]
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Abstract

The establishment and distribution of Echinoparyphium recurvatum metacercariae in the second intermediate host, Lymnaea peregra, were investigated at a temperature range of 5–29°C. Preliminary studies on the survival and infectivity of E. recurvatum cercariae showed that both parameters were temperature dependent. No cercarial transmission occurred at 5 or 10°C. Nevertheless, the transmission efficiency (1/H0) indicated that transmission was temperature independent in the temperature range 17–25°C and was much lower than in previous studies using this host–parasite system. These differences were attributed to low cercarial densities used in this study. The effect of temperature on encystment site choice (mantle cavity, kidney, pericardium) by metacercariae showed that the mantle cavity was the prime site of encystment, followed by the pericardium and the kidney. Temperatures at the lower and upper ranges (14 and 29°C), however, caused a significant reduction in encystment in the mantle cavity but not in the pericardium or kidney. The importance of cercarial densities, the physiological mechanisms influencing metacercarial distribution and their implications for parasite transmission to the definitive host are discussed.

Type
Research Papers
Information
Journal of Helminthology , Volume 81 , Issue 3 , September 2007 , pp. 311 - 315
Copyright
Copyright © Cambridge University Press 2007

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