Life‐cycle and feeding strategies of freshwater triclads

a synthesis

P. Calow, A. F. Davidson, A. S. Woollhead

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    A relationship is discovered between feeding and life‐cycle strategies in triclads which explains why closely related and coexisting species may either be semelparous (annual) or iteroparous (perennial). Semelparous species feed on active food and in so doing adopt a sit and wait feeding strategy whereas iteroparous species feed on sluggish food and have to seek it out. The semelparous species therefore tend, because of their lower metabolic costs in foraging, to be more efficient converters of food to tissue than the iteroparous species. This efficiency, which allows more rapid growth rates and some immunity to disturbances in food supply, means that in the field semelparous juveniles are likely to have better survival chances (relative to parents) than iteroparous juveniles. Hence sit and wait feeders can “afford” to invest more in reproduction and usually have more to invest than seek‐out feeders.

    Original languageEnglish (US)
    Pages (from-to)215-237
    Number of pages23
    JournalJournal of Zoology
    Volume193
    Issue number2
    DOIs
    StatePublished - Jan 1 1981

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    feeding methods
    synthesis
    immunity
    foraging
    food
    food supply
    disturbance
    cost
    tissues

    Cite this

    Life‐cycle and feeding strategies of freshwater triclads : a synthesis. / Calow, P.; Davidson, A. F.; Woollhead, A. S.

    In: Journal of Zoology, Vol. 193, No. 2, 01.01.1981, p. 215-237.

    Research output: Contribution to journalArticle

    Calow, P. ; Davidson, A. F. ; Woollhead, A. S. / Life‐cycle and feeding strategies of freshwater triclads : a synthesis. In: Journal of Zoology. 1981 ; Vol. 193, No. 2. pp. 215-237.
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