Journal
JOURNAL OF PLANKTON RESEARCH
Volume 33, Issue 2, Pages 297-308Publisher
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbq102
Keywords
Pseudo-nitzschia; Domoic acid; Chemical composition; Toxin; Nutrient limitation
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Funding
- National Swedish Research Council
- European Commission [EVK3-2001-00050]
- GLOBAL-2 [003933]
- Fundacao Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES/Brazil)
- Programa de Pos-graduacao em Oceanografia Biologica/Universidade Federal do Rio Grande (PGOB/FURG/Brazil)
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Here we compare cell physiology and domoic acid (DA) production for two strains of the diatom Pseudo-nitzschia multiseries originating from two opposite latitudes: Canada (CA) and Brazil (BR). The algae were grown as chemostat cultures at 0.2, 0.3 and 0.4 day(-1) under nitrogen (N)- and phosphorus (P)-deficient conditions. The level of deficiency significantly affected the atomic C:N, C:P, C:Si and N:P ratios in both strains. In both strains, P per cell was 2-4 x higher in the N- than in the P-deficient cultures. The opposite was not found for N in the P-deficient cultures) as shown by the N:P ratios and C:N ratios. The C:N and C:P ratios were significantly lower in the CA strain, and this did not change due to the level of deficiency The concentration and production of DA per cell per day were significantly higher for both strains under P deficiency as expected since the toxin is rich in N. However, DA was also produced by both strains during continuous cell division under N deficiency High or low bacterial densities associated with P multiseries did not increase or decrease DA production. Our data imply that more attention needs to be given to the N:P ratios and concentrations in the waters where these algae occur, as both N and P deficiencies affect DA production and cellular DA concentrations.
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