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Long-term trends in helminth infections of wood mice (Apodemus sylvaticus) from the vicinity of Malham Tarn in North Yorkshire, England

Published online by Cambridge University Press:  01 December 2020

Jerzy M. Behnke Open the ORCID record for Jerzy M. Behnke [Opens in a new window] ,
Michael T. Rogan ,
Philip S. Craig ,
Joseph A. Jackson  and
Geoff Hide Open the ORCID record for Geoff Hide [Opens in a new window]
Jerzy M. Behnke*
Affiliation:
School of Life Sciences, University of Nottingham, University Park, NottinghamNG7 2RD, UK
Michael T. Rogan
Affiliation:
Biomedical Research Centre, School of Science, Engineering and Environment, University of Salford, SalfordM5 4WT, UK
Philip S. Craig
Affiliation:
Biomedical Research Centre, School of Science, Engineering and Environment, University of Salford, SalfordM5 4WT, UK
Joseph A. Jackson
Affiliation:
Biomedical Research Centre, School of Science, Engineering and Environment, University of Salford, SalfordM5 4WT, UK
Geoff Hide
Affiliation:
Biomedical Research Centre, School of Science, Engineering and Environment, University of Salford, SalfordM5 4WT, UK
*
Author for correspondence: Jerzy M. Behnke, E-mail: jerzy.behnke@nottingham.ac.uk
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Abstract

Helminth infections in wood mice (n = 483), trapped over a period of 26 years in the woods surrounding Malham Tarn in North Yorkshire, were analysed. Although 10 species of helminths were identified, the overall mean species richness was 1.01 species/mouse indicating that the helminth community was relatively depauperate in this wood mouse population. The dominant species was Heligmosomoides polygyrus, the prevalence (64.6%) and abundance (10.4 worms/mouse) of which declined significantly over the study period. Because of the dominance of this species, analyses of higher taxa (combined helminths and combined nematodes) also revealed significantly declining values for prevalence, although not abundance. Helminth species richness (HSR) and Brillouin's index of diversity (BID) did not show covariance with year, neither did those remaining species whose overall prevalence exceeded 5% (Syphacia stroma, Aonchotheca murissylvatici and Plagiorchis muris). Significant age effects were detected for the prevalence and abundance of all higher taxa, H. polygyrus and P. muris, and for HSR and BID, reflecting the accumulation of helminths with increasing host age. Only two cases of sex bias were found; male bias in abundance of P. muris and combined Digenea. We discuss the significance of these results and hypothesize about the underlying causes.

Keywords

AbundanceagecestodesDigeneaHeligmosomoides polygyrushelminthsnematodesPlagiorchis murisprevalencesexSyphacia stroma
Type
Research Article
Information
Parasitology , Volume 148 , Issue 4 , April 2021 , pp. 451 - 463
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Copyright © The Author(s), 2020. Published by Cambridge University Press

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