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Dietary restriction in two rotifer species: the effect of the length of food deprivation on life span and reproduction

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Abstract

According to resource allocation theory, animals face a trade off between the allocation of resources into reproduction and into individual growth/maintenance. This trade off is reinforced when food conditions decline. It is well established in biological research that many animals increase their life span when food is in suboptimal supply for growth and/or reproduction. Such a situation of reduced food availability is called dietary restriction. An increase in life span under dietary restricted conditions is seen as a strategy to tolerate periods of food shortage so that the animals can start reproduction again when food is in greater supply. In this study, the effect of dietary restriction on life span and reproduction in two rotifer species, Cephalodella sp. and Elosa worallii, was investigated using life table experiments. The food concentration under dietary restricted conditions was below the threshold for population growth. It was (1) tested whether the rotifers start reproduction again after food replenishment, and (2) estimated whether the time scale of dietary restricted conditions is relevant for the persistence of a population in the field. Only E. worallii responded to dietary restriction with an increase in life span at the expense of reproduction. After replenishment of food, E. worallii started to reproduce again within 1 day. With an increase in the duration of dietary restricted conditions of up to 15 days, which is longer than the median life span of E. worallii under food saturation, the life span increased and the life time reproduction decreased. These results suggest that in a temporally (or spatially) variable environment, some rotifer populations can persist even during long periods of severe food deprivation.

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Acknowledgements

I wish to thank Ch. Schirmer for excellent assistance in the laboratory. The manuscript benefitted from helpful comments from the two reviewers as well as N. Kamjunke and E. Bell, who also corrected the English.

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Correspondence to Guntram Weithoff.

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Communicated by Roland Brandl.

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Weithoff, G. Dietary restriction in two rotifer species: the effect of the length of food deprivation on life span and reproduction. Oecologia 153, 303–308 (2007). https://doi.org/10.1007/s00442-007-0739-6

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  • DOI: https://doi.org/10.1007/s00442-007-0739-6

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