JPR Advance Access originally published online on December 5, 2006
Journal of Plankton Research 2007 29(1):87-96; doi:10.1093/plankt/fbl065
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Do the polyunsaturated aldehydes produced by Phaeocystis pouchetii (Hariot) Lagerheim influence diatom growth during the spring bloom in Northern Norway?
1 Marbio, Department of Marine Biotechnology, NFH, University of Tromsø, N-9037 Tromsø, Norway 2 Department OF Aquatic Biosciences, NFH, University of Tromsø, N-9037 Tromsø, Norway
* Corresponding Author: hans{at}phaeocystis.com
Received on May 25, 2006; accepted on October 24, 2006
 |
Abstract |
|---|
The marine bloom-forming phytoplankter Phaeocystis pouchetii (Prymnesiophyceae) is known to produce and release the cytotoxic 
,ß,
,
-unsaturated aldehyde 2-trans-4-trans-decadienal (DD), known to inhibit mitotic cell divisions in several different cell types. The possible allelopathic effects of DD on monocultures of three common diatoms from the coastal waters of northern Norway were assessed. The results showed that division rates for all three diatom species (Skeletonema costatum, Chaetoceros socialis and Thalassiosira antarctica) decreased as concentration of DD increased. Furthermore field data from the spring bloom in Vestfjorden (2000 and 2001) were analysed to examine whether the presence of P. pouchetii influences other species adversely. Our data revealed no significant adverse effect of P. pouchetii on diatom presence since diatom diversity generally was positively correlated to P. pouchetii biomass. The year with the lowest amounts of P. pouchetii had the lowest diversities, and the diatom species composition and abundance was comparable to situations where P. pouchetii was either absent or present in minute amounts. At some instances low diversity co-occurred with large fractions of P. pouchetii, but since this were at the strongest vertical mixing we believe this to be a result of physical control. P. pouchetii and S. costatum were the most frequently co-occurring species, and since they are both known producers of polyunsaturated aldehydes we cannot exclude the possibility that the presence of DD released from P. pouchetii induced by heavy grazing might influence the growth of other phytoplankton species.
Communicating editor: K.J. Flynn
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  C. Vidoudez and G. Pohnert Growth phase-specific release of polyunsaturated aldehydes by the diatom Skeletonema marinoi J. Plankton Res., November 1, 2008; 30(11): 1305 - 1313. [Abstract] [Full Text] [PDF]
|
|