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Ancylostoma duodenale and Necator americanus: effect of temperature on egg development and mortality

Published online by Cambridge University Press:  06 April 2009

G. Smith  and
G. A. Schad
G. Smith
Affiliation:
Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, 382 W. Street Road, Kennett Square, PA 19348, USA
G. A. Schad
Affiliation:
Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA
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Summary

The development and mortality of the eggs of Ancylostoma duodenale and Necator americanus in distilled water were monitored over a range of temperatures between 15 and 35°C. Egg demography was examined within the context of a fourparameter mathematical model of development and mortality. Over the range of temperatures studied, egg mortality (μ) was an increasing exponential function of temperature (T) measured in degrees Celsius. A single model adequately described the mortality of both species (ln [μ] = 0·041*T − 6·87). The minimum time (τ) to hatching was consistently less for A. duodenale (ln [1/T] = −(0·79+53·05*[l/T]) than N. americanus (ln [1/T] = −(0·99 + 53·05*[l/T])). The hatching rate [σ when t > τ) was an increasing function of time and temperature in both cases, but the precise functional relationship was species specific.

Keywords

Ancylostoma duodenaleNecator americanusegg developmentmortalitytemperature.
Type
Research Article
Information
Parasitology , Volume 99 , Issue 1 , August 1989 , pp. 127 - 132
Copyright
Copyright © Cambridge University Press 1989

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