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JPR Advance Access originally published online on February 5, 2007
Journal of Plankton Research 2007 29(4):339-345; doi:10.1093/plankt/fbm020
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Effects of cyanobacterium exopolysaccharides on life-history of Ceriodaphnia cornuta SARS

Rodrigo B. Choueri1, Maria Da Graça G. Melão1,*, Ana T. Lombardi2 and Armando A. H. Vieira2

1 Laboratório de Plâncton, Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), São Carlos, C.P. 676, 13565-905 SP, Brazil 2 Departamento de Botânica, UFSCar, São Carlos, SP, Brazil

* Corresponding author: dmgm{at}power.ufscar.br

Received on September 15, 2006; accepted on January 8, 2007


  Abstract

The objective of the present investigation was to verify if Anabaena spiroides exopolysaccharides sustains growth and reproduction of Ceriodaphnia cornuta. The animals were raised in controlled laboratory conditions and fed exclusively on A. spiroides exopolysaccharides, which were obtained from filtered stationary growth phase A. spiroides cultures. A molecular weight cut-off of 12–14 kDa was used to separate the exopolysaccharides from low molecular weight materials. The lyophilized exopolysaccharides were dissolved in filtered and autoclaved reservoir water at a concentration of 15 mg L–1 (0.22 ± 0.01 mg C animal–1day–1). These results were compared with animals fed on seston at natural concentration obtained by filtering (68 µm) Barra Bonica Reservoir water (0.23 ± 0.01 mg C animal–1day–1). Several life history parameters (duration of embryonic development, generation time, reproductive performance, age-specific length, primipara age and length) were obtained during 15-day experiments. Growth rate (GR) and weight-specific secondary production were also quantified. Exopolysaccharide-fed organisms had better growth and reproductive performance (0.091 ± 0.004 GR; 51 ± 4.59 eggs produced per female) than seston-fed individuals (0.078 ± 0.010 GR; 30.90 ± 7.25 eggs produced per female). These results show that such macromolecules are a potential food source, fulfilling nutritional requirements to sustain growth and reproduction of C. cornuta and supports trophic relationships in aquatic ecosystems.

Communicating editor: K.J. Flynn


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