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Influence of an extreme climatic event on bilateral asymmetry and occurrence of eye flukes in perch (Perca fluviatilis) and roach (Rutilus rutilus) from a lake in southeast England

Published online by Cambridge University Press:  28 June 2019

N.J. Morley Open the ORCID record for N.J. Morley [Opens in a new window]  and
J.W. Lewis
N.J. Morley*
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
J.W. Lewis
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
*
Author for correspondence: Neil J. Morley, E-mail: n.morley@rhul.ac.uk
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Abstract

Eye flukes are common infections of freshwater fish and their occurrence as metacercarial stages may occur non-randomly resulting in an asymmetrical distribution within the host eyes. However, from previous studies the presentation of bias by these trematodes lacks consistency suggesting that congenital asymmetrical effects are unlikely to be the cause and exogenous factors, such as environmental stress, may be more influential. The present study, undertaken over a 4-year period, investigates the impact of an extreme heatwave and drought on the annual bilateral asymmetry and occurrence of two eye fluke species (Diplostomum sp. in the lens and Tylodelphys sp. in the vitreous humour) from perch (Perca fluviatilis) and roach (Rutilus rutilus). The onset of the extreme climatic event resulted in a significant negative effect on the occurrence of the eye flukes. Bilateral asymmetry, which was present within both trematode species and hosts, appeared to be highly variable between eye fluke and fish species and also year of study. However, during the pre-drought period both host species demonstrated significant asymmetry for Tylodelphys sp. but not for Diplostomum sp. while during the drought this bias was reversed. The potential role of fluctuating asymmetry of fish hosts in structuring the bilateral asymmetry of eye flukes is discussed.

Keywords

Eye flukesbilateral asymmetryfluctuating asymmetryfishdroughtheatwave
Type
Research Paper
Information
Journal of Helminthology , Volume 94 , 2020 , e57
Copyright
Copyright © Cambridge University Press 2019 

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