Ichthyocotylurus erraticus (Digenea : Strigeldae): factors affecting infection intensity and the effects of infection on pollan (Coregonus autumnalis), a glacial relict fish

C Harrod, D Griffiths

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Lough Neagh Pollan are heavily infected with the strigeid Ichthyocotylurus erraticus, with 100% prevalence and median infection intensities of 600+ metacercariae in the pericardial cavity of mature fish. Female fish were more heavily infected than males. Infection intensity, which rose in summer, varied with pollan size, year, sampling bay within the lough and, water depth within bays. Heavily infected Pollan were caught further offshore than lightly infected fish. Spatial variation in Pollan infection intensity corresponded to variation in the abundance of the first intermediate host, Valvata snails. The data Suggest that heavily infected fish had lower food intakes. Parasitism reduced condition and liver size in male fish but condition in heavily parasitized females increased. Infection intensity was greater in larger fish of a given age. These patterns are discussed in the context of risks and rewards. The data suggest that inshore waters in summer are the preferred habitat of pollan and that the greater infection intensity of offshore fish results from their reduced competitive ability as a consequence of parasitism and the increased risk of infection there.
    LanguageEnglish
    Pages511-519
    JournalParasitology
    Volume131
    Issue numberPart 4
    DOIs
    Publication statusPublished - Oct 2005

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    Coregonus autumnalis
    fish
    infection
    parasitism
    metacercariae
    summer
    intermediate hosts
    snails
    spatial variation
    food intake
    Rosa
    liver

    Cite this

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    title = "Ichthyocotylurus erraticus (Digenea : Strigeldae): factors affecting infection intensity and the effects of infection on pollan (Coregonus autumnalis), a glacial relict fish",
    abstract = "Lough Neagh Pollan are heavily infected with the strigeid Ichthyocotylurus erraticus, with 100{\%} prevalence and median infection intensities of 600+ metacercariae in the pericardial cavity of mature fish. Female fish were more heavily infected than males. Infection intensity, which rose in summer, varied with pollan size, year, sampling bay within the lough and, water depth within bays. Heavily infected Pollan were caught further offshore than lightly infected fish. Spatial variation in Pollan infection intensity corresponded to variation in the abundance of the first intermediate host, Valvata snails. The data Suggest that heavily infected fish had lower food intakes. Parasitism reduced condition and liver size in male fish but condition in heavily parasitized females increased. Infection intensity was greater in larger fish of a given age. These patterns are discussed in the context of risks and rewards. The data suggest that inshore waters in summer are the preferred habitat of pollan and that the greater infection intensity of offshore fish results from their reduced competitive ability as a consequence of parasitism and the increased risk of infection there.",
    author = "C Harrod and D Griffiths",
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    language = "English",
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    journal = "Parasitology",
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    Ichthyocotylurus erraticus (Digenea : Strigeldae): factors affecting infection intensity and the effects of infection on pollan (Coregonus autumnalis), a glacial relict fish. / Harrod, C; Griffiths, D.

    In: Parasitology, Vol. 131, No. Part 4, 10.2005, p. 511-519.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AB - Lough Neagh Pollan are heavily infected with the strigeid Ichthyocotylurus erraticus, with 100% prevalence and median infection intensities of 600+ metacercariae in the pericardial cavity of mature fish. Female fish were more heavily infected than males. Infection intensity, which rose in summer, varied with pollan size, year, sampling bay within the lough and, water depth within bays. Heavily infected Pollan were caught further offshore than lightly infected fish. Spatial variation in Pollan infection intensity corresponded to variation in the abundance of the first intermediate host, Valvata snails. The data Suggest that heavily infected fish had lower food intakes. Parasitism reduced condition and liver size in male fish but condition in heavily parasitized females increased. Infection intensity was greater in larger fish of a given age. These patterns are discussed in the context of risks and rewards. The data suggest that inshore waters in summer are the preferred habitat of pollan and that the greater infection intensity of offshore fish results from their reduced competitive ability as a consequence of parasitism and the increased risk of infection there.

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