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Life history consequences of sterol availability in the aquatic keystone species Daphnia

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Abstract

The absence of essential biochemical nutrients, such as polyunsaturated fatty acids or sterols, has been considered as a mechanism determining trophic interactions between the herbivore Daphnia and its phytoplankton food source. Here, we experimentally quantify the sensitivity of two Daphnia species to decreasing amounts of dietary sterols by measuring variations in life history traits. The two species Daphnia magna and D. galeata were fed different mixtures of the sterol-containing green alga Scenedesmus obliquus and the sterol-free cyanobacterium Synechococcus elongatus; a higher proportion of Synechococcus in the food is equivalent to a decrease in dietary sterols. To address the significance of sterol limitation, the Daphnia species were also fed Synechococcus supplemented with cholesterol. In both species, somatic and population growth rates, maternal dry mass, the number of viable offspring, and the probability of survival were significantly reduced with the lower availability of sterols. A high correlation between the sterol content of the mixed diet and the somatic and population growth rates was found, and growth on cholesterol-supplemented Synechococcus fitted well into this correlation. Somatic growth of first-clutch neonates grown on 100% Synechococcus exhibited a pattern similar to that of somatic growth of their mothers grown on the different food regimes, which demonstrated the significance of maternal effects for sterol-limited population growth. Daphnia galeata had a twofold higher incipient limiting sterol level than D. magna, which indicated interspecific differences in sterol requirements between the two Daphnia species. The results suggest a strong impact of dietary sterols on life history traits and therefore, population dynamics of the keystone species Daphnia.

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Acknowledgements

This study was supported by the German Research Foundation (DFG, El 179/4-2). We thank S. Schumacher for experimental assistance, K.A. Brune for editing the English, and two anonymous reviewers for valuable comments on an earlier draft of this manuscript.

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Correspondence to Dominik Martin-Creuzburg.

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Communicated by Roland Brandl

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Martin-Creuzburg, D., Wacker, A. & von Elert, E. Life history consequences of sterol availability in the aquatic keystone species Daphnia . Oecologia 144, 362–372 (2005). https://doi.org/10.1007/s00442-005-0090-8

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  • DOI: https://doi.org/10.1007/s00442-005-0090-8

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