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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 7 | PAGES 791-804 | 1997
© Oxford University Press

research-article

Infection of Coscinodiscus spp. by the parasitoid nanoflagellate Pirsonla diadema: I. Behavioural studies on the infection process

Stefanie F. Kühn

Aifred-Wegener-Institute for Polar and Marine Research Bio II,PO Box 12 01 16, D-27515 Bremerhaven, FRG

Received on July 3, 1996; accepted on February 6, 1997 The investigation of successive steps involved in the infection process of the marine diatoms Coscinodiscus granii and Coscuwdiscus wailesii by the host-specific parasitoid nanoflagellate (PNF) Pirsonia diadenw showed that flagellates reacted chemokJinokinetically with changes of swimming pattern to the presence of a host diatom. Chemosensory stimulation appeared to induce readiness for infection, whereas attachment and penetration of the diatom cell wall was induced by a mechanosensory response to morphological features on the diatom frustules. The mean swimming speed of P.diadema flagellates decreased during their infective lifetime of 3 days from an average of 78 µm s–1 to 51 µm s–1 while the frequency of small loops in the swimming pattern increased from 0.8 to 6.3 loops min–1. At high Cgranii densities, an epidemic was delayed. It is suggested that this could be caused by overlapping gradients of extracellular material released by the diatoms which impaired the sensing of spatial gradients by PNF and, therefore, the location of hosts.


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