Daphnia fed algal food grown at elevated temperature have reduced fitness

  • Anna B. Sikora | a.b.sikora@uw.edu.pl University of Warsaw, Poland.
  • Piotr Dawidowicz University of Warsaw, Poland.
  • Eric von Elert University of Cologne, Germany.

Abstract

Lake water temperature is negatively correlated with fatty acids content and P:C ratio in green algae. Hence, elevated temperature may indirectly reduce the fitness of Daphnia due to induced decrease in algal food quality. The aim of this study was to test the hypotheses that quality of algal food decreases with increasing temperature of its culture and that large-bodied Daphnia are more vulnerable to the temperature-related deterioration of algal food quality than small-bodied ones. Laboratory life-table experiments were performed at 20°C with large-bodied D. pulicaria and small-bodied D. cucullata fed with the green alga Scenedesmus obliquus, that had been grown at temperatures of 16, 24 or 32°C. The somatic growth rates of both species decreased significantly with increasing algal culture temperature and this effect was more pronounced in D. pulicaria than in D. cucullata. In the former species, age at first reproduction significantly increased and clutch size significantly decreased with increasing temperature of algae growth, while no significant changes in these two parameters were observed in the latter species. The proportion of egg-bearing females decreased with increasing algal culture temperature in both species. The results of this study support the notion that the quality of algal food decreases with increasing water temperature and also suggest that small-bodied Daphnia species might be less vulnerable to temperature-related decreases in algal food quality than large-bodied ones.

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Author Biographies

Anna B. Sikora, University of Warsaw

Department of Hydrobiology, Faculty of Biology,
Biological and Chemical Research Center,

Piotr Dawidowicz, University of Warsaw

Department of Hydrobiology, Faculty of Biology,
Biological and Chemical Research Center

Eric von Elert, University of Cologne
Aquatic Chemical Ecology, Cologne Biocenter,
Published
2014-05-06
Info
Issue
Section
Original Articles
Supporting Agencies
Polish Ministry of Science and Higher Education
Keywords:
Temperature, food quality, Daphnia, body size, Scenedesmus obliquus, life history.
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How to Cite
1.
Sikora AB, Dawidowicz P, von Elert E. Daphnia fed algal food grown at elevated temperature have reduced fitness. J Limnol [Internet]. 2014May6 [cited 2020Aug.15];73(3). Available from: https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2014.898