The feeding strategies of two freshwater gastropods, Ancylus fluviatilis Müll. and Planorbis contortus Linn. (Pulmonata), in terms of ingestion rates and absorption efficiencies

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    Abstract

    Radiotracer and gravimetric techniques were used to investigate the effects of starvation, temperature, body size and food quality on both the ingestion rates and absorption efficiencies of A. fluviatilis (an algal grazer) and P. contortus (a detrivore which utilises the bacterial fraction of its food). In the face of food supply disturbance snails showed a considerable potential for adaptation. Both intestion rates and absorption efficiencies increased with starvation, and ingestion rate increased with reductions in food quality. Absorption efficiencies were independent of temperature and Q10 values for absorption rates suggested that snails showed some acclimation to temperature disturbance. Food absorption was linearly related to body surface area but absorption efficiencies were to a large extent independent of age and size. The above homeostases are discussed in terms of their contribution to fitness and also in terms of the possible underlying causal mechanisms. The implications of physiological homeostases for ecological efficiencies are also discussed.

    Original languageEnglish (US)
    Pages (from-to)33-49
    Number of pages17
    JournalOecologia
    Volume20
    Issue number1
    DOIs
    StatePublished - Mar 1 1975

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    absorption efficiency
    feeding methods
    ingestion rate
    gastropod
    Gastropoda
    ingestion
    food quality
    homeostasis
    starvation
    snail
    disturbance
    snails
    food
    temperature
    food supply
    acclimation
    body size
    fitness
    surface area
    detritivores

    Cite this

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    title = "The feeding strategies of two freshwater gastropods, Ancylus fluviatilis M{\"u}ll. and Planorbis contortus Linn. (Pulmonata), in terms of ingestion rates and absorption efficiencies",
    abstract = "Radiotracer and gravimetric techniques were used to investigate the effects of starvation, temperature, body size and food quality on both the ingestion rates and absorption efficiencies of A. fluviatilis (an algal grazer) and P. contortus (a detrivore which utilises the bacterial fraction of its food). In the face of food supply disturbance snails showed a considerable potential for adaptation. Both intestion rates and absorption efficiencies increased with starvation, and ingestion rate increased with reductions in food quality. Absorption efficiencies were independent of temperature and Q10 values for absorption rates suggested that snails showed some acclimation to temperature disturbance. Food absorption was linearly related to body surface area but absorption efficiencies were to a large extent independent of age and size. The above homeostases are discussed in terms of their contribution to fitness and also in terms of the possible underlying causal mechanisms. The implications of physiological homeostases for ecological efficiencies are also discussed.",
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    N2 - Radiotracer and gravimetric techniques were used to investigate the effects of starvation, temperature, body size and food quality on both the ingestion rates and absorption efficiencies of A. fluviatilis (an algal grazer) and P. contortus (a detrivore which utilises the bacterial fraction of its food). In the face of food supply disturbance snails showed a considerable potential for adaptation. Both intestion rates and absorption efficiencies increased with starvation, and ingestion rate increased with reductions in food quality. Absorption efficiencies were independent of temperature and Q10 values for absorption rates suggested that snails showed some acclimation to temperature disturbance. Food absorption was linearly related to body surface area but absorption efficiencies were to a large extent independent of age and size. The above homeostases are discussed in terms of their contribution to fitness and also in terms of the possible underlying causal mechanisms. The implications of physiological homeostases for ecological efficiencies are also discussed.

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