CHANGES IN ABUNDANCE OF CYPRINID AND PERCID PREY AFFECT RATE OF PREDATION BY CORMORANTS PHALACROCORAX-CARBO-CARBO ON SALMON SALMO-SALAR SMOLT IN NORTHERN-IRELAND

GMA Warke, KR Day

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    Cormorant diet is described from the analysis of pellets, fledgling regurgitates and the stomach contents of adult birds. Non-breeding coastal birds consumed mostly marine fish while breeding birds were found to feed mostly on freshwater fish species. The long distances travelled to inland feeding sites while breeding suggested that the high energy investment in commuting could be traded against the rewards of greater, more varied or more predictably exploitable food supplies in certain freshwaters at certain times. In years when Roach and Perch were much less abundant in Lough Neagh, diet at the breeding colony reverted to an increased proportion of marine fish and even a high Salmon smelt run on an inland river was practically neglected. In recent years the impact of Cormorants on fish in this river close to the breeding colony has declined and a number of reasons for this are discussed. Nevertheless, Cormorants visit the river all the year round and their impact on older Salmon parr is likely to be particularly significant.
    LanguageEnglish
    Pages157-166
    JournalArdea
    Volume83
    Issue number1
    Publication statusPublished - 1995

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    Phalacrocorax carbo
    Northern Ireland
    Phalacrocorax
    smolts
    Salmo salar
    salmon
    predation
    marine fish
    rivers
    birds
    breeding
    parr
    perch
    freshwater fish
    diet
    breeding sites
    pellets
    stomach
    energy
    fish

    Cite this

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    title = "CHANGES IN ABUNDANCE OF CYPRINID AND PERCID PREY AFFECT RATE OF PREDATION BY CORMORANTS PHALACROCORAX-CARBO-CARBO ON SALMON SALMO-SALAR SMOLT IN NORTHERN-IRELAND",
    abstract = "Cormorant diet is described from the analysis of pellets, fledgling regurgitates and the stomach contents of adult birds. Non-breeding coastal birds consumed mostly marine fish while breeding birds were found to feed mostly on freshwater fish species. The long distances travelled to inland feeding sites while breeding suggested that the high energy investment in commuting could be traded against the rewards of greater, more varied or more predictably exploitable food supplies in certain freshwaters at certain times. In years when Roach and Perch were much less abundant in Lough Neagh, diet at the breeding colony reverted to an increased proportion of marine fish and even a high Salmon smelt run on an inland river was practically neglected. In recent years the impact of Cormorants on fish in this river close to the breeding colony has declined and a number of reasons for this are discussed. Nevertheless, Cormorants visit the river all the year round and their impact on older Salmon parr is likely to be particularly significant.",
    author = "GMA Warke and KR Day",
    year = "1995",
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    volume = "83",
    pages = "157--166",
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    CHANGES IN ABUNDANCE OF CYPRINID AND PERCID PREY AFFECT RATE OF PREDATION BY CORMORANTS PHALACROCORAX-CARBO-CARBO ON SALMON SALMO-SALAR SMOLT IN NORTHERN-IRELAND. / Warke, GMA; Day, KR.

    Vol. 83, No. 1, 1995, p. 157-166.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AB - Cormorant diet is described from the analysis of pellets, fledgling regurgitates and the stomach contents of adult birds. Non-breeding coastal birds consumed mostly marine fish while breeding birds were found to feed mostly on freshwater fish species. The long distances travelled to inland feeding sites while breeding suggested that the high energy investment in commuting could be traded against the rewards of greater, more varied or more predictably exploitable food supplies in certain freshwaters at certain times. In years when Roach and Perch were much less abundant in Lough Neagh, diet at the breeding colony reverted to an increased proportion of marine fish and even a high Salmon smelt run on an inland river was practically neglected. In recent years the impact of Cormorants on fish in this river close to the breeding colony has declined and a number of reasons for this are discussed. Nevertheless, Cormorants visit the river all the year round and their impact on older Salmon parr is likely to be particularly significant.

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