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Age specific fecundity and size of offspring in the prosobranch snail, Viviparus ater

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Summary

Age specific fecundity and size of offspring were compared in two populations of Viviparus ater, one from Lake Zürich (Switzerland) and one from Lake Maggiore (Italy). Females were caged and their offspring sampled at weekly intervals. Average fecundity per female over one year was 19.6 and 14.7 offspring in Lake Zürich and Lake Maggiore, respectively. Average shell widths of offspring at birth in the two lakes were 8.5 mm and 7.4 mm. Fecundity did not change with age in Lake Zürich but decreased with increasing age of the snails in Lake Maggiore. Fecundity and offspring size were positively correlated with the size of the females in both lakes, but fecundity was higher and offspring were larger in Lake Zürich than in Lake Maggiore irrespective of the size of the females. An analysis of covariance, correcting for differences between the two lakes in the total fresh weight of the offspring produced annually, showed that females from the two lakes distributed their reproductive investment differently. Females in Lake Zürich produced relatively fewer but larger offspring than females in Lake Maggiore. This trade-off was hidden because females in Lake Zürich produced twice as much offspring biomass as females in Lake Maggiore. The possibility that different selection regimes might account for the observed differences is discussed.

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Authors and Affiliations

  1. Zoologisches Museum, University of Zürich, CH-Zürich, Switzerland

    G. Ribi

  2. Zoologisches Institut, University of Basel, CH-Basel, Switzerland

    M. Gebhardt

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  1. G. Ribi
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  2. M. Gebhardt
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Ribi, G., Gebhardt, M. Age specific fecundity and size of offspring in the prosobranch snail, Viviparus ater . Oecologia 71, 18–24 (1986). https://doi.org/10.1007/BF00377314

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