Prevalence and intensity of the ectoparasite Echinophthirius horridus on harbour seals (Phoca vitulina): Effects of host age and inter-annual variability in host food availability

P. M. Thompson, H. M. Corpe, R. J. Reid

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The epidemiology of the sucking lice Echinophthirius horridus was studied over a 4 year period in which their harbour seal hosts experienced marked inter-annual changes in food availability. Prevalence and intensity of infection varied in relation to host age but not sex. Burdens were highest on immature seals, but both prevalence and intensity of infection were significantly higher in years when food availability was low. Observed intra- population variations in ectoparasite dynamics suggested that reported geographical differences in the prevalence of E. horridus may have resulted from methodological differences. In contrast to previous studies of other pinnipeds, lice were also absent on weaned pups, suggesting that E. horridus is transferred horizontally. No significant differences were found in the haematological parameters of infected and uninfected hosts. Nevertheless, there was a significant negative correlation between intensity of infection and several erythrocyte parameters, suggesting that high burdens of lice may compromise diving ability.

Original languageEnglish
Pages (from-to)393-403
Number of pages11
JournalParasitology
Volume117
Issue number4
DOIs
Publication statusPublished - 2 Nov 1998

Fingerprint

Phoca
Phoca vitulina
ectoparasites
food availability
Phthiraptera
lice
Food
Anoplura
Pinnipedia
Infection
infection
Diving
seals
pups
epidemiology
Epidemiology
erythrocytes
Erythrocytes
immatures
gender

Keywords

  • Echinophthirius horridus
  • Epidemiology
  • Harbour seals
  • Inter-annual variation
  • Pinniped

ASJC Scopus subject areas

  • Parasitology
  • Animal Science and Zoology
  • Infectious Diseases

Cite this

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title = "Prevalence and intensity of the ectoparasite Echinophthirius horridus on harbour seals (Phoca vitulina): Effects of host age and inter-annual variability in host food availability",
abstract = "The epidemiology of the sucking lice Echinophthirius horridus was studied over a 4 year period in which their harbour seal hosts experienced marked inter-annual changes in food availability. Prevalence and intensity of infection varied in relation to host age but not sex. Burdens were highest on immature seals, but both prevalence and intensity of infection were significantly higher in years when food availability was low. Observed intra- population variations in ectoparasite dynamics suggested that reported geographical differences in the prevalence of E. horridus may have resulted from methodological differences. In contrast to previous studies of other pinnipeds, lice were also absent on weaned pups, suggesting that E. horridus is transferred horizontally. No significant differences were found in the haematological parameters of infected and uninfected hosts. Nevertheless, there was a significant negative correlation between intensity of infection and several erythrocyte parameters, suggesting that high burdens of lice may compromise diving ability.",
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T1 - Prevalence and intensity of the ectoparasite Echinophthirius horridus on harbour seals (Phoca vitulina)

T2 - Effects of host age and inter-annual variability in host food availability

AU - Thompson, P. M.

AU - Corpe, H. M.

AU - Reid, R. J.

PY - 1998/11/2

Y1 - 1998/11/2

N2 - The epidemiology of the sucking lice Echinophthirius horridus was studied over a 4 year period in which their harbour seal hosts experienced marked inter-annual changes in food availability. Prevalence and intensity of infection varied in relation to host age but not sex. Burdens were highest on immature seals, but both prevalence and intensity of infection were significantly higher in years when food availability was low. Observed intra- population variations in ectoparasite dynamics suggested that reported geographical differences in the prevalence of E. horridus may have resulted from methodological differences. In contrast to previous studies of other pinnipeds, lice were also absent on weaned pups, suggesting that E. horridus is transferred horizontally. No significant differences were found in the haematological parameters of infected and uninfected hosts. Nevertheless, there was a significant negative correlation between intensity of infection and several erythrocyte parameters, suggesting that high burdens of lice may compromise diving ability.

AB - The epidemiology of the sucking lice Echinophthirius horridus was studied over a 4 year period in which their harbour seal hosts experienced marked inter-annual changes in food availability. Prevalence and intensity of infection varied in relation to host age but not sex. Burdens were highest on immature seals, but both prevalence and intensity of infection were significantly higher in years when food availability was low. Observed intra- population variations in ectoparasite dynamics suggested that reported geographical differences in the prevalence of E. horridus may have resulted from methodological differences. In contrast to previous studies of other pinnipeds, lice were also absent on weaned pups, suggesting that E. horridus is transferred horizontally. No significant differences were found in the haematological parameters of infected and uninfected hosts. Nevertheless, there was a significant negative correlation between intensity of infection and several erythrocyte parameters, suggesting that high burdens of lice may compromise diving ability.

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