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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 4 | PAGES 635-641 | 1996
© Oxford University Press

other

Predation on marine picoplankton populations examined with an ‘add-in’ approach

M.T. Perez, J.R. Dolan1, F. Rassoulzadegan and B. Mostajir

Observatoire Océanologique, CNRS/INSU B. P. 28, F-06230 Villefranche-sur-Mer, France

1To whom correspondence should be addressed

Received on July 10, 1995; accepted on November 14, 1995 NW Mediterranean surface water was spiked with picoplankton prey (heterotrophic bacteria or cyanobacteria) or predators (bacterivorous microflagellates or ciliates) to investigate differential grazing pressure on picoplankton populations. Adding a particular prey type did not yield different growth patterns for heterotrophic bacteria and cyanobacteria. but gave either similar, positive, effects on both picoplankton types or similar negative effects. Natural populations of both predator types increased with additions of cyanobacteria, but not heterotrophic bacteria. Ciliate additions gave marked decreases in cyanobacteria. While individual groups of grazers may preferentially consume cyanobacteria, selective grazing is probably not responsible for the maintenance of apparently stable populations of different groups of picoplankters during the summer.


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Home page
 J PLANKTON RESHome page
M. Hirose, T. Katano, and S.-I. Nakano
Growth and grazing mortality rates of Prochlorococcus, Synechococcus and eukaryotic picophytoplankton in a bay of the Uwa Sea, Japan
J. Plankton Res., March 1, 2008; 30(3): 241 - 250.
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