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Diurnal variation in egg excretion by Heterakis gallinarum

Published online by Cambridge University Press:  06 July 2018

Gürbüz Daş Open the ORCID record for Gürbüz Daş [Opens in a new window] ,
Pål O. Westermark  and
Matthias Gauly
Gürbüz Daş*
Affiliation:
Institute of Nutritional Physiology ‘Oskar Kellner’, Leibniz Institute for Farm Animal Biology, 18196, Dummerstorf, Germany
Pål O. Westermark
Affiliation:
Bioinformatics and Biomathematics Unit, Institute of Genetics and Biometry, Leibniz Institute for Farm Animal Biology, 18196 Dummerstorf, Germany
Matthias Gauly
Affiliation:
Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Domenicani 3, 39100 Bolzano, Italy
*
Author for correspondence: Gürbüz Daş, E-mail: gdas@fbn-dummerstorf.de
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Abstract

Periodicity in nematode egg excretion may be of evolutionary origin as it can favour dispersal of the eggs in the environment. We investigated whether egg excretion by Heterakis gallinarum shows a repeatable pattern of periodicity. The faecal egg concentration and total number of eggs excreted within 4-h intervals were significantly affected by the sampling time within 1 day, but remained unaffected by the sampling day or interaction effects. By contrast, the total number of eggs excreted within 24 h did not differ among the 4 days of the study, collectively indicating repeatable egg excretion patterns. Both host feces and parasite egg excretion increased from night to late afternoon, followed by a decrease in the evening, resulting in higher egg excretion during daytime than the dark period. Feces excretion and worm fecundity showed overlapping diurnal rhythms with similarly timed phases, suggesting the existence of synchronicity between the host feces and nematode egg excretion patterns. We conclude that egg excretion by H. gallinarum is synchronized with host feces excretion and is higher during the daytime than during the dark period. This overlaps with the maximum activity of the day-active host and allows a maximal dispersal of the eggs in the environment.

Keywords

Diurnalhelminthhostnematodeperiodicity
Type
Research Article
Information
Parasitology , Volume 146 , Issue 2 , February 2019 , pp. 206 - 212
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Copyright
Copyright © Cambridge University Press 2018 

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