Abstract
Background, aim, and scope
Climate changes are nowadays an important issue of concern, and it is expected that in the near future it will be intensified, leading to extreme environmental conditions. These changes are expected to originate additional sources of stress; therefore, the exposure of organisms to natural stressors is receiving an increased importance in risk assessment. Organisms tend to avoid extremely environmental conditions looking for optimum conditions. This work aimed to evaluate the effects of natural stressors on the energetic reserves of Daphnia magna using the quantification of lipids, proteins, and sugars.
Materials and methods
Daphnids were exposed to different temperature regimes (16, 18, 22, 24, and 26°C), food levels (2, 1.5, 1, 0.5, and 0 and 4, 4.5, 5, 5.5, and 6 × 105 cells/ml Pseudokirchneriella subcapitata) and oxygen depletion (2 to 6 mg DO/L) and their energy reserves quantified. Protein, lipid, and sugar contents where compared between daphnids exposed to control conditions and ones exposed to considered stress situations.
Results and discussion
Significant changes in energy reserves content after a 96-h exposure were observed in temperatures 16, 22, 24, and 26°C. In the exposure to different food levels, daphnids showed significant differences on their energetic reserves when exposed to higher or lower levels of algae when compared with the control. Oxygen depletion did not affect significantly their energy budget.
Conclusions
The results from this work demonstrate that the environmental alterations related mainly to temperatures variations and food availability produced changes in D. magna energetic reserves. These changes can be transposed to the population levels as they are a result of changes in the metabolic rate and physiological processes that are related to growth and maturation.
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Acknowledgments
The study was supported by the EU Integrated project NoMiracle (Novel Methods for Integrated Risk assessment of Cumulative Stressors in Europe; http://nomiracle.jrc.it) contract No. 003956 under the theme under the EU-theme “Global Change and Ecosystems” topic “Development of risk assessment methodologies”, coordinated by Dr. Hans Løkke at NERI, DK-8600 Silkeborg, Denmark. The Programme Alban, the European Union Programme of High Level Scholarships for Latin America, supported Tullus U. Bergman Filho with a M.Sc. grant (E07M402154BR).
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Communicated by Henner Hollert
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Bergman Filho, T.U., Soares, A.M.V.M. & Loureiro, S. Energy budget in Daphnia magna exposed to natural stressors. Environ Sci Pollut Res 18, 655–662 (2011). https://doi.org/10.1007/s11356-010-0413-0
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DOI: https://doi.org/10.1007/s11356-010-0413-0