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JPR Advance Access published online on August 20, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh134
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Received March 19, 2004
Accepted August 4, 2004

Article

Picocyanobacteria photosynthetic efficiency under Daphnia grazing pressure

Cristiana Callieri 1*, Esteban Balseiro 2, Roberto Bertoni 1, Beatriz Modenutti 2

1 CNR - Institute of Ecosystem Study, Section of Hydrobiology and Ecology of Inland Waters, Verbania Pallanza, Italy
2 CONICET - Universidad Nacional del Comahue, Laboratorio de Limnología, Bariloche, Argentina

* To whom correspondence should be addressed. E-mail: c.callieri{at}ise.cnr.it.


  Abstract

Daphnia hyalina was used to assess the impact of zooplankton on the photosynthetic activity of picocyanobacteria. A phosphorus-limited laboratory system was designed, composed of 3 µm filtered lake water with natural assemblages to which non-axenic Synechococcus sp. was added. Different treatments with and without Daphnia were arranged; aliquots from these were sampled during three-day incubations to measure changes in picocyanobacterial (Pcy) net primary production (NPP), excreted organic carbon (EOC), DOC and photosynthetic parameters (P/E curves). Bacterial number, biovolume and production were measured both in the treatment and control to evaluate possible bacteria interferences. A significant increase of Pcy photosynthesis and efficiency (2 and 3 fold increase of Pmax and {alpha} respectively) was observed in the bottles supplemented with Daphnia, whereas cell-specific bacterial production did not. At the same time, the EOC/NPP ratio was 2.3 times lower with the grazer. This result clearly shows the impact of P-recycling mediated by a grazer on Pcy growth and production.


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