Intraspecific variation in somatic cell turnover and regenerativi rate in the freshwater planarian dendrocoelum lacteum

Rafael Romero, Jaume Baguná, Peter Calow

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    4 Scopus citations

    Abstract

    Life-cycle theory predicts that a trade-off exists between somatic maintenance and reproduction. Short-lived semelparous organisms, with a high investment in reproduction, should have lower levels of somatic cell turnover leading to accelerated senescence and reduced post-reproductive survival, than long-lived iteroparous organisms. This model has been tested by intraspecific comparison of mitotic rates and rates of regeneration, taken as indexes of somatic cell population dynamics, between two different populations of a reportedly semelparous species of freshwater triclad, Dendrocoelum lacteum, and a population of the iteroparous species Dugesia(S)mediterranea. Mitotic activity and rate of regeneration were found to increase from northern (N) to southern (S) populations of D. lacteum and from the latter to D.(S)mediterranea; this trend is opposite to that found for reproductive investment in the same populations. Both features agree with reports of true semelparity for N populations and presumed iteroparity for S populations. The implications of these results as regards life-cycle theory and the cellular basis of cell renewal and regeneration in freshwater triclads are discussed.

    Original languageEnglish (US)
    Pages (from-to)107-113
    Number of pages7
    JournalInvertebrate Reproduction and Development
    Volume20
    Issue number2
    DOIs
    StatePublished - Nov 1991

    Keywords

    • Cell tumover
    • Planarian
    • Regeneration
    • Senescence
    • Temperature Life-Cycles

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